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This is gcc.info, produced by makeinfo version 5.2 from gcc.texi.
Copyright (C) 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007 2008 Free Software
Foundation, Inc.
Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License, Version 1.2 or
any later version published by the Free Software Foundation; with the
Invariant Sections being "GNU General Public License" and "Funding Free
Software", the Front-Cover texts being (a) (see below), and with the
Back-Cover Texts being (b) (see below). A copy of the license is
included in the section entitled "GNU Free Documentation License".
(a) The FSF's Front-Cover Text is:
A GNU Manual
(b) The FSF's Back-Cover Text is:
You have freedom to copy and modify this GNU Manual, like GNU software.
Copies published by the Free Software Foundation raise funds for GNU
development.
INFO-DIR-SECTION Software development
START-INFO-DIR-ENTRY
* gcc: (gcc). The GNU Compiler Collection.
* g++: (gcc). The GNU C++ compiler.
END-INFO-DIR-ENTRY
This file documents the use of the GNU compilers.
Copyright (C) 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007 2008 Free Software
Foundation, Inc.
Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License, Version 1.2 or
any later version published by the Free Software Foundation; with the
Invariant Sections being "GNU General Public License" and "Funding Free
Software", the Front-Cover texts being (a) (see below), and with the
Back-Cover Texts being (b) (see below). A copy of the license is
included in the section entitled "GNU Free Documentation License".
(a) The FSF's Front-Cover Text is:
A GNU Manual
(b) The FSF's Back-Cover Text is:
You have freedom to copy and modify this GNU Manual, like GNU software.
Copies published by the Free Software Foundation raise funds for GNU
development.

File: gcc.info, Node: Top, Next: G++ and GCC, Up: (DIR)
Introduction
************
This manual documents how to use the GNU compilers, as well as their
features and incompatibilities, and how to report bugs. It corresponds
to the compilers (GCC) version 4.3.3. The internals of the GNU
compilers, including how to port them to new targets and some
information about how to write front ends for new languages, are
documented in a separate manual. *Note Introduction: (gccint)Top.
* Menu:
* G++ and GCC:: You can compile C or C++ programs.
* Standards:: Language standards supported by GCC.
* Invoking GCC:: Command options supported by 'gcc'.
* C Implementation:: How GCC implements the ISO C specification.
* C Extensions:: GNU extensions to the C language family.
* C++ Extensions:: GNU extensions to the C++ language.
* Objective-C:: GNU Objective-C runtime features.
* Compatibility:: Binary Compatibility
* Gcov:: 'gcov'--a test coverage program.
* Trouble:: If you have trouble using GCC.
* Bugs:: How, why and where to report bugs.
* Service:: How to find suppliers of support for GCC.
* Contributing:: How to contribute to testing and developing GCC.
* Funding:: How to help assure funding for free software.
* GNU Project:: The GNU Project and GNU/Linux.
* Copying:: GNU General Public License says
how you can copy and share GCC.
* GNU Free Documentation License:: How you can copy and share this manual.
* Contributors:: People who have contributed to GCC.
* Option Index:: Index to command line options.
* Keyword Index:: Index of concepts and symbol names.

File: gcc.info, Node: G++ and GCC, Next: Standards, Up: Top
1 Programming Languages Supported by GCC
****************************************
GCC stands for "GNU Compiler Collection". GCC is an integrated
distribution of compilers for several major programming languages.
These languages currently include C, C++, Objective-C, Objective-C++,
Java, Fortran, and Ada.
The abbreviation "GCC" has multiple meanings in common use. The
current official meaning is "GNU Compiler Collection", which refers
generically to the complete suite of tools. The name historically stood
for "GNU C Compiler", and this usage is still common when the emphasis
is on compiling C programs. Finally, the name is also used when
speaking of the "language-independent" component of GCC: code shared
among the compilers for all supported languages.
The language-independent component of GCC includes the majority of the
optimizers, as well as the "back ends" that generate machine code for
various processors.
The part of a compiler that is specific to a particular language is
called the "front end". In addition to the front ends that are
integrated components of GCC, there are several other front ends that
are maintained separately. These support languages such as Pascal,
Mercury, and COBOL. To use these, they must be built together with GCC
proper.
Most of the compilers for languages other than C have their own names.
The C++ compiler is G++, the Ada compiler is GNAT, and so on. When we
talk about compiling one of those languages, we might refer to that
compiler by its own name, or as GCC. Either is correct.
Historically, compilers for many languages, including C++ and Fortran,
have been implemented as "preprocessors" which emit another high level
language such as C. None of the compilers included in GCC are
implemented this way; they all generate machine code directly. This
sort of preprocessor should not be confused with the "C preprocessor",
which is an integral feature of the C, C++, Objective-C and
Objective-C++ languages.

File: gcc.info, Node: Standards, Next: Invoking GCC, Prev: G++ and GCC, Up: Top
2 Language Standards Supported by GCC
*************************************
For each language compiled by GCC for which there is a standard, GCC
attempts to follow one or more versions of that standard, possibly with
some exceptions, and possibly with some extensions.
2.1 C language
==============
GCC supports three versions of the C standard, although support for the
most recent version is not yet complete.
The original ANSI C standard (X3.159-1989) was ratified in 1989 and
published in 1990. This standard was ratified as an ISO standard
(ISO/IEC 9899:1990) later in 1990. There were no technical differences
between these publications, although the sections of the ANSI standard
were renumbered and became clauses in the ISO standard. This standard,
in both its forms, is commonly known as "C89", or occasionally as "C90",
from the dates of ratification. The ANSI standard, but not the ISO
standard, also came with a Rationale document. To select this standard
in GCC, use one of the options '-ansi', '-std=c89' or
'-std=iso9899:1990'; to obtain all the diagnostics required by the
standard, you should also specify '-pedantic' (or '-pedantic-errors' if
you want them to be errors rather than warnings). *Note Options
Controlling C Dialect: C Dialect Options.
Errors in the 1990 ISO C standard were corrected in two Technical
Corrigenda published in 1994 and 1996. GCC does not support the
uncorrected version.
An amendment to the 1990 standard was published in 1995. This
amendment added digraphs and '__STDC_VERSION__' to the language, but
otherwise concerned the library. This amendment is commonly known as
"AMD1"; the amended standard is sometimes known as "C94" or "C95". To
select this standard in GCC, use the option '-std=iso9899:199409' (with,
as for other standard versions, '-pedantic' to receive all required
diagnostics).
A new edition of the ISO C standard was published in 1999 as ISO/IEC
9899:1999, and is commonly known as "C99". GCC has incomplete support
for this standard version; see
<http://gcc.gnu.org/gcc-4.3/c99status.html> for details. To select this
standard, use '-std=c99' or '-std=iso9899:1999'. (While in development,
drafts of this standard version were referred to as "C9X".)
Errors in the 1999 ISO C standard were corrected in three Technical
Corrigenda published in 2001, 2004 and 2007. GCC does not support the
uncorrected version.
By default, GCC provides some extensions to the C language that on rare
occasions conflict with the C standard. *Note Extensions to the C
Language Family: C Extensions. Use of the '-std' options listed above
will disable these extensions where they conflict with the C standard
version selected. You may also select an extended version of the C
language explicitly with '-std=gnu89' (for C89 with GNU extensions) or
'-std=gnu99' (for C99 with GNU extensions). The default, if no C
language dialect options are given, is '-std=gnu89'; this will change to
'-std=gnu99' in some future release when the C99 support is complete.
Some features that are part of the C99 standard are accepted as
extensions in C89 mode.
The ISO C standard defines (in clause 4) two classes of conforming
implementation. A "conforming hosted implementation" supports the whole
standard including all the library facilities; a "conforming
freestanding implementation" is only required to provide certain library
facilities: those in '<float.h>', '<limits.h>', '<stdarg.h>', and
'<stddef.h>'; since AMD1, also those in '<iso646.h>'; and in C99, also
those in '<stdbool.h>' and '<stdint.h>'. In addition, complex types,
added in C99, are not required for freestanding implementations. The
standard also defines two environments for programs, a "freestanding
environment", required of all implementations and which may not have
library facilities beyond those required of freestanding
implementations, where the handling of program startup and termination
are implementation-defined, and a "hosted environment", which is not
required, in which all the library facilities are provided and startup
is through a function 'int main (void)' or 'int main (int, char *[])'.
An OS kernel would be a freestanding environment; a program using the
facilities of an operating system would normally be in a hosted
implementation.
GCC aims towards being usable as a conforming freestanding
implementation, or as the compiler for a conforming hosted
implementation. By default, it will act as the compiler for a hosted
implementation, defining '__STDC_HOSTED__' as '1' and presuming that
when the names of ISO C functions are used, they have the semantics
defined in the standard. To make it act as a conforming freestanding
implementation for a freestanding environment, use the option
'-ffreestanding'; it will then define '__STDC_HOSTED__' to '0' and not
make assumptions about the meanings of function names from the standard
library, with exceptions noted below. To build an OS kernel, you may
well still need to make your own arrangements for linking and startup.
*Note Options Controlling C Dialect: C Dialect Options.
GCC does not provide the library facilities required only of hosted
implementations, nor yet all the facilities required by C99 of
freestanding implementations; to use the facilities of a hosted
environment, you will need to find them elsewhere (for example, in the
GNU C library). *Note Standard Libraries: Standard Libraries.
Most of the compiler support routines used by GCC are present in
'libgcc', but there are a few exceptions. GCC requires the freestanding
environment provide 'memcpy', 'memmove', 'memset' and 'memcmp'.
Finally, if '__builtin_trap' is used, and the target does not implement
the 'trap' pattern, then GCC will emit a call to 'abort'.
For references to Technical Corrigenda, Rationale documents and
information concerning the history of C that is available online, see
<http://gcc.gnu.org/readings.html>
2.2 C++ language
================
GCC supports the ISO C++ standard (1998) and contains experimental
support for the upcoming ISO C++ standard (200x).
The original ISO C++ standard was published as the ISO standard
(ISO/IEC 14882:1998) and amended by a Technical Corrigenda published in
2003 (ISO/IEC 14882:2003). These standards are referred to as C++98 and
C++03, respectively. GCC implements the majority of C++98 ('export' is
a notable exception) and most of the changes in C++03. To select this
standard in GCC, use one of the options '-ansi' or '-std=c++98'; to
obtain all the diagnostics required by the standard, you should also
specify '-pedantic' (or '-pedantic-errors' if you want them to be errors
rather than warnings).
The ISO C++ committee is working on a new ISO C++ standard, dubbed
C++0x, that is intended to be published by 2009. C++0x contains several
changes to the C++ language, some of which have been implemented in an
experimental C++0x mode in GCC. The C++0x mode in GCC tracks the draft
working paper for the C++0x standard; the latest working paper is
available on the ISO C++ committee's web site at
<http://www.open-std.org/jtc1/sc22/wg21/>. For information regarding
the C++0x features available in the experimental C++0x mode, see
<http://gcc.gnu.org/gcc-4.3/cxx0x_status.html>. To select this standard
in GCC, use the option '-std=c++0x'; to obtain all the diagnostics
required by the standard, you should also specify '-pedantic' (or
'-pedantic-errors' if you want them to be errors rather than warnings).
By default, GCC provides some extensions to the C++ language; *Note
Options Controlling C++ Dialect: C++ Dialect Options. Use of the '-std'
option listed above will disable these extensions. You may also select
an extended version of the C++ language explicitly with '-std=gnu++98'
(for C++98 with GNU extensions) or '-std=gnu++0x' (for C++0x with GNU
extensions). The default, if no C++ language dialect options are given,
is '-std=gnu++98'.
2.3 Objective-C and Objective-C++ languages
===========================================
There is no formal written standard for Objective-C or Objective-C++.
The most authoritative manual is "Object-Oriented Programming and the
Objective-C Language", available at a number of web sites:
*
<http://developer.apple.com/documentation/Cocoa/Conceptual/ObjectiveC/>
is a recent (and periodically updated) version;
* <http://www.toodarkpark.org/computers/objc/> is an older example;
* <http://www.gnustep.org> and <http://gcc.gnu.org/readings.html>
have additional useful information.
2.4 Treelang language
=====================
There is no standard for treelang, which is a sample language front end
for GCC. Its only purpose is as a sample for people wishing to write a
new language for GCC. The language is documented in
'gcc/treelang/treelang.texi' which can be turned into info or HTML
format.
*Note GNAT Reference Manual: (gnat_rm)Top, for information on standard
conformance and compatibility of the Ada compiler.
*Note Standards: (gfortran)Standards, for details of standards
supported by GNU Fortran.
*Note Compatibility with the Java Platform: (gcj)Compatibility, for
details of compatibility between 'gcj' and the Java Platform.

File: gcc.info, Node: Invoking GCC, Next: C Implementation, Prev: Standards, Up: Top
3 GCC Command Options
*********************
When you invoke GCC, it normally does preprocessing, compilation,
assembly and linking. The "overall options" allow you to stop this
process at an intermediate stage. For example, the '-c' option says not
to run the linker. Then the output consists of object files output by
the assembler.
Other options are passed on to one stage of processing. Some options
control the preprocessor and others the compiler itself. Yet other
options control the assembler and linker; most of these are not
documented here, since you rarely need to use any of them.
Most of the command line options that you can use with GCC are useful
for C programs; when an option is only useful with another language
(usually C++), the explanation says so explicitly. If the description
for a particular option does not mention a source language, you can use
that option with all supported languages.
*Note Compiling C++ Programs: Invoking G++, for a summary of special
options for compiling C++ programs.
The 'gcc' program accepts options and file names as operands. Many
options have multi-letter names; therefore multiple single-letter
options may _not_ be grouped: '-dr' is very different from '-d -r'.
You can mix options and other arguments. For the most part, the order
you use doesn't matter. Order does matter when you use several options
of the same kind; for example, if you specify '-L' more than once, the
directories are searched in the order specified. Also, the placement of
the '-l' option is significant.
Many options have long names starting with '-f' or with '-W'--for
example, '-fmove-loop-invariants', '-Wformat' and so on. Most of these
have both positive and negative forms; the negative form of '-ffoo'
would be '-fno-foo'. This manual documents only one of these two forms,
whichever one is not the default.
*Note Option Index::, for an index to GCC's options.
* Menu:
* Option Summary:: Brief list of all options, without explanations.
* Overall Options:: Controlling the kind of output:
an executable, object files, assembler files,
or preprocessed source.
* Invoking G++:: Compiling C++ programs.
* C Dialect Options:: Controlling the variant of C language compiled.
* C++ Dialect Options:: Variations on C++.
* Objective-C and Objective-C++ Dialect Options:: Variations on Objective-C
and Objective-C++.
* Language Independent Options:: Controlling how diagnostics should be
formatted.
* Warning Options:: How picky should the compiler be?
* Debugging Options:: Symbol tables, measurements, and debugging dumps.
* Optimize Options:: How much optimization?
* Preprocessor Options:: Controlling header files and macro definitions.
Also, getting dependency information for Make.
* Assembler Options:: Passing options to the assembler.
* Link Options:: Specifying libraries and so on.
* Directory Options:: Where to find header files and libraries.
Where to find the compiler executable files.
* Spec Files:: How to pass switches to sub-processes.
* Target Options:: Running a cross-compiler, or an old version of GCC.
* Submodel Options:: Specifying minor hardware or convention variations,
such as 68010 vs 68020.
* Code Gen Options:: Specifying conventions for function calls, data layout
and register usage.
* Environment Variables:: Env vars that affect GCC.
* Precompiled Headers:: Compiling a header once, and using it many times.
* Running Protoize:: Automatically adding or removing function prototypes.

File: gcc.info, Node: Option Summary, Next: Overall Options, Up: Invoking GCC
3.1 Option Summary
==================
Here is a summary of all the options, grouped by type. Explanations are
in the following sections.
_Overall Options_
*Note Options Controlling the Kind of Output: Overall Options.
-c -S -E -o FILE -combine -pipe -pass-exit-codes
-x LANGUAGE -v -### --help[=CLASS] --target-help
--version @FILE
_C Language Options_
*Note Options Controlling C Dialect: C Dialect Options.
-ansi -std=STANDARD -fgnu89-inline
-aux-info FILENAME
-fno-asm -fno-builtin -fno-builtin-FUNCTION
-fhosted -ffreestanding -fopenmp -fms-extensions
-trigraphs -no-integrated-cpp -traditional -traditional-cpp
-fallow-single-precision -fcond-mismatch -flax-vector-conversions
-fsigned-bitfields -fsigned-char
-funsigned-bitfields -funsigned-char
_C++ Language Options_
*Note Options Controlling C++ Dialect: C++ Dialect Options.
-fabi-version=N -fno-access-control -fcheck-new
-fconserve-space -ffriend-injection
-fno-elide-constructors
-fno-enforce-eh-specs
-ffor-scope -fno-for-scope -fno-gnu-keywords
-fno-implicit-templates
-fno-implicit-inline-templates
-fno-implement-inlines -fms-extensions
-fno-nonansi-builtins -fno-operator-names
-fno-optional-diags -fpermissive
-frepo -fno-rtti -fstats -ftemplate-depth-N
-fno-threadsafe-statics -fuse-cxa-atexit -fno-weak -nostdinc++
-fno-default-inline -fvisibility-inlines-hidden
-fvisibility-ms-compat
-Wabi -Wctor-dtor-privacy
-Wnon-virtual-dtor -Wreorder
-Weffc++ -Wno-deprecated -Wstrict-null-sentinel
-Wno-non-template-friend -Wold-style-cast
-Woverloaded-virtual -Wno-pmf-conversions
-Wsign-promo
_Objective-C and Objective-C++ Language Options_
*Note Options Controlling Objective-C and Objective-C++ Dialects:
Objective-C and Objective-C++ Dialect Options.
-fconstant-string-class=CLASS-NAME
-fgnu-runtime -fnext-runtime
-fno-nil-receivers
-fobjc-call-cxx-cdtors
-fobjc-direct-dispatch
-fobjc-exceptions
-fobjc-gc
-freplace-objc-classes
-fzero-link
-gen-decls
-Wassign-intercept
-Wno-protocol -Wselector
-Wstrict-selector-match
-Wundeclared-selector
_Language Independent Options_
*Note Options to Control Diagnostic Messages Formatting: Language
Independent Options.
-fmessage-length=N
-fdiagnostics-show-location=[once|every-line]
-fdiagnostics-show-option
_Warning Options_
*Note Options to Request or Suppress Warnings: Warning Options.
-fsyntax-only -pedantic -pedantic-errors
-w -Wextra -Wall -Waddress -Waggregate-return -Warray-bounds
-Wno-attributes -Wc++-compat -Wc++0x-compat -Wcast-align -Wcast-qual
-Wchar-subscripts -Wclobbered -Wcomment
-Wconversion -Wcoverage-mismatch -Wno-deprecated-declarations
-Wdisabled-optimization -Wno-div-by-zero
-Wempty-body -Wno-endif-labels
-Werror -Werror=*
-Wfatal-errors -Wfloat-equal -Wformat -Wformat=2
-Wno-format-extra-args -Wformat-nonliteral
-Wformat-security -Wformat-y2k -Wignored-qualifiers
-Wimplicit -Wimplicit-function-declaration -Wimplicit-int
-Wimport -Wno-import -Winit-self -Winline
-Wno-int-to-pointer-cast -Wno-invalid-offsetof
-Winvalid-pch -Wlarger-than-LEN -Wunsafe-loop-optimizations
-Wlogical-op -Wlong-long
-Wmain -Wmissing-braces -Wmissing-field-initializers
-Wmissing-format-attribute -Wmissing-include-dirs
-Wmissing-noreturn
-Wno-multichar -Wnonnull -Wno-overflow
-Woverlength-strings -Wpacked -Wpadded
-Wparentheses -Wpointer-arith -Wno-pointer-to-int-cast
-Wredundant-decls
-Wreturn-type -Wsequence-point -Wshadow
-Wsign-compare -Wsign-conversion -Wstack-protector
-Wstrict-aliasing -Wstrict-aliasing=n
-Wstrict-overflow -Wstrict-overflow=N
-Wswitch -Wswitch-default -Wswitch-enum
-Wsystem-headers -Wtrigraphs -Wtype-limits -Wundef -Wuninitialized
-Wunknown-pragmas -Wno-pragmas -Wunreachable-code
-Wunused -Wunused-function -Wunused-label -Wunused-parameter
-Wunused-value -Wunused-variable
-Wvariadic-macros -Wvla
-Wvolatile-register-var -Wwrite-strings
_C and Objective-C-only Warning Options_
-Wbad-function-cast -Wmissing-declarations
-Wmissing-parameter-type -Wmissing-prototypes -Wnested-externs
-Wold-style-declaration -Wold-style-definition
-Wstrict-prototypes -Wtraditional -Wtraditional-conversion
-Wdeclaration-after-statement -Wpointer-sign
_Debugging Options_
*Note Options for Debugging Your Program or GCC: Debugging Options.
-dLETTERS -dumpspecs -dumpmachine -dumpversion
-fdbg-cnt-list -fdbg-cnt=COUNTER-VALUE-LIST
-fdump-noaddr -fdump-unnumbered -fdump-translation-unit[-N]
-fdump-class-hierarchy[-N]
-fdump-ipa-all -fdump-ipa-cgraph -fdump-ipa-inline
-fdump-tree-all
-fdump-tree-original[-N]
-fdump-tree-optimized[-N]
-fdump-tree-cfg -fdump-tree-vcg -fdump-tree-alias
-fdump-tree-ch
-fdump-tree-ssa[-N] -fdump-tree-pre[-N]
-fdump-tree-ccp[-N] -fdump-tree-dce[-N]
-fdump-tree-gimple[-raw] -fdump-tree-mudflap[-N]
-fdump-tree-dom[-N]
-fdump-tree-dse[-N]
-fdump-tree-phiopt[-N]
-fdump-tree-forwprop[-N]
-fdump-tree-copyrename[-N]
-fdump-tree-nrv -fdump-tree-vect
-fdump-tree-sink
-fdump-tree-sra[-N]
-fdump-tree-salias
-fdump-tree-fre[-N]
-fdump-tree-vrp[-N]
-ftree-vectorizer-verbose=N
-fdump-tree-storeccp[-N]
-feliminate-dwarf2-dups -feliminate-unused-debug-types
-feliminate-unused-debug-symbols -femit-class-debug-always
-fmem-report -fpre-ipa-mem-report -fpost-ipa-mem-report -fprofile-arcs
-frandom-seed=STRING -fsched-verbose=N
-ftest-coverage -ftime-report -fvar-tracking
-g -gLEVEL -gcoff -gdwarf-2
-ggdb -gstabs -gstabs+ -gvms -gxcoff -gxcoff+
-fno-merge-debug-strings -fdebug-prefix-map=OLD=NEW
-femit-struct-debug-baseonly -femit-struct-debug-reduced
-femit-struct-debug-detailed[=SPEC-LIST]
-p -pg -print-file-name=LIBRARY -print-libgcc-file-name
-print-multi-directory -print-multi-lib
-print-prog-name=PROGRAM -print-search-dirs -Q
-print-sysroot-headers-suffix
-save-temps -time
_Optimization Options_
*Note Options that Control Optimization: Optimize Options.
-falign-functions[=N] -falign-jumps[=N]
-falign-labels[=N] -falign-loops[=N] -fassociative-math
-fauto-inc-dec -fbranch-probabilities -fbranch-target-load-optimize
-fbranch-target-load-optimize2 -fbtr-bb-exclusive -fcaller-saves
-fcheck-data-deps -fcprop-registers -fcrossjumping -fcse-follow-jumps
-fcse-skip-blocks -fcx-limited-range -fdata-sections -fdce -fdce
-fdelayed-branch -fdelete-null-pointer-checks -fdse -fdse
-fearly-inlining -fexpensive-optimizations -ffast-math
-ffinite-math-only -ffloat-store -fforward-propagate
-ffunction-sections -fgcse -fgcse-after-reload -fgcse-las -fgcse-lm
-fgcse-sm -fif-conversion -fif-conversion2 -finline-functions
-finline-functions-called-once -finline-limit=N
-finline-small-functions -fipa-cp -fipa-matrix-reorg -fipa-pta
-fipa-pure-const -fipa-reference -fipa-struct-reorg
-fipa-type-escape -fivopts -fkeep-inline-functions -fkeep-static-consts
-fmerge-all-constants -fmerge-constants -fmodulo-sched
-fmodulo-sched-allow-regmoves -fmove-loop-invariants -fmudflap
-fmudflapir -fmudflapth -fno-branch-count-reg -fno-default-inline
-fno-defer-pop -fno-function-cse -fno-guess-branch-probability
-fno-inline -fno-math-errno -fno-peephole -fno-peephole2
-fno-sched-interblock -fno-sched-spec -fno-signed-zeros
-fno-toplevel-reorder -fno-trapping-math -fno-zero-initialized-in-bss
-fomit-frame-pointer -foptimize-register-move -foptimize-sibling-calls
-fpeel-loops -fpredictive-commoning -fprefetch-loop-arrays
-fprofile-generate -fprofile-use -fprofile-values -freciprocal-math
-fregmove -frename-registers -freorder-blocks
-freorder-blocks-and-partition -freorder-functions
-frerun-cse-after-loop -freschedule-modulo-scheduled-loops
-frounding-math -frtl-abstract-sequences -fsched2-use-superblocks
-fsched2-use-traces -fsched-spec-load -fsched-spec-load-dangerous
-fsched-stalled-insns-dep[=N] -fsched-stalled-insns[=N]
-fschedule-insns -fschedule-insns2 -fsection-anchors -fsee
-fsignaling-nans -fsingle-precision-constant -fsplit-ivs-in-unroller
-fsplit-wide-types -fstack-protector -fstack-protector-all
-fstrict-aliasing -fstrict-overflow -fthread-jumps -ftracer -ftree-ccp
-ftree-ch -ftree-copy-prop -ftree-copyrename -ftree-dce
-ftree-dominator-opts -ftree-dse -ftree-fre -ftree-loop-im
-ftree-loop-ivcanon -ftree-loop-linear -ftree-loop-optimize
-ftree-parallelize-loops=N -ftree-pre -ftree-reassoc -ftree-salias
-ftree-sink -ftree-sra -ftree-store-ccp -ftree-ter
-ftree-vect-loop-version -ftree-vectorize -ftree-vrp -funit-at-a-time
-funroll-all-loops -funroll-loops -funsafe-loop-optimizations
-funsafe-math-optimizations -funswitch-loops
-fvariable-expansion-in-unroller -fvect-cost-model -fvpt -fweb
-fwhole-program
--param NAME=VALUE
-O -O0 -O1 -O2 -O3 -Os
_Preprocessor Options_
*Note Options Controlling the Preprocessor: Preprocessor Options.
-AQUESTION=ANSWER
-A-QUESTION[=ANSWER]
-C -dD -dI -dM -dN
-DMACRO[=DEFN] -E -H
-idirafter DIR
-include FILE -imacros FILE
-iprefix FILE -iwithprefix DIR
-iwithprefixbefore DIR -isystem DIR
-imultilib DIR -isysroot DIR
-M -MM -MF -MG -MP -MQ -MT -nostdinc
-P -fworking-directory -remap
-trigraphs -undef -UMACRO -Wp,OPTION
-Xpreprocessor OPTION
_Assembler Option_
*Note Passing Options to the Assembler: Assembler Options.
-Wa,OPTION -Xassembler OPTION
_Linker Options_
*Note Options for Linking: Link Options.
OBJECT-FILE-NAME -lLIBRARY
-nostartfiles -nodefaultlibs -nostdlib -pie -rdynamic
-s -static -static-libgcc -shared -shared-libgcc -symbolic
-Wl,OPTION -Xlinker OPTION
-u SYMBOL
_Directory Options_
*Note Options for Directory Search: Directory Options.
-BPREFIX -IDIR -iquoteDIR -LDIR
-specs=FILE -I- --sysroot=DIR
_Target Options_
*Note Target Options::.
-V VERSION -b MACHINE
_Machine Dependent Options_
*Note Hardware Models and Configurations: Submodel Options.
_ARC Options_
-EB -EL
-mmangle-cpu -mcpu=CPU -mtext=TEXT-SECTION
-mdata=DATA-SECTION -mrodata=READONLY-DATA-SECTION
_ARM Options_
-mapcs-frame -mno-apcs-frame
-mabi=NAME
-mapcs-stack-check -mno-apcs-stack-check
-mapcs-float -mno-apcs-float
-mapcs-reentrant -mno-apcs-reentrant
-msched-prolog -mno-sched-prolog
-mlittle-endian -mbig-endian -mwords-little-endian
-mfloat-abi=NAME -msoft-float -mhard-float -mfpe
-mthumb-interwork -mno-thumb-interwork
-mcpu=NAME -march=NAME -mfpu=NAME
-mstructure-size-boundary=N
-mabort-on-noreturn
-mlong-calls -mno-long-calls
-msingle-pic-base -mno-single-pic-base
-mpic-register=REG
-mnop-fun-dllimport
-mcirrus-fix-invalid-insns -mno-cirrus-fix-invalid-insns
-mpoke-function-name
-mthumb -marm
-mtpcs-frame -mtpcs-leaf-frame
-mcaller-super-interworking -mcallee-super-interworking
-mtp=NAME
_AVR Options_
-mmcu=MCU -msize -minit-stack=N -mno-interrupts
-mcall-prologues -mno-tablejump -mtiny-stack -mint8
_Blackfin Options_
-mcpu=CPU[-SIREVISION]
-msim -momit-leaf-frame-pointer -mno-omit-leaf-frame-pointer
-mspecld-anomaly -mno-specld-anomaly -mcsync-anomaly -mno-csync-anomaly
-mlow-64k -mno-low64k -mstack-check-l1 -mid-shared-library
-mno-id-shared-library -mshared-library-id=N
-mleaf-id-shared-library -mno-leaf-id-shared-library
-msep-data -mno-sep-data -mlong-calls -mno-long-calls
-mfast-fp -minline-plt
_CRIS Options_
-mcpu=CPU -march=CPU -mtune=CPU
-mmax-stack-frame=N -melinux-stacksize=N
-metrax4 -metrax100 -mpdebug -mcc-init -mno-side-effects
-mstack-align -mdata-align -mconst-align
-m32-bit -m16-bit -m8-bit -mno-prologue-epilogue -mno-gotplt
-melf -maout -melinux -mlinux -sim -sim2
-mmul-bug-workaround -mno-mul-bug-workaround
_CRX Options_
-mmac -mpush-args
_Darwin Options_
-all_load -allowable_client -arch -arch_errors_fatal
-arch_only -bind_at_load -bundle -bundle_loader
-client_name -compatibility_version -current_version
-dead_strip
-dependency-file -dylib_file -dylinker_install_name
-dynamic -dynamiclib -exported_symbols_list
-filelist -flat_namespace -force_cpusubtype_ALL
-force_flat_namespace -headerpad_max_install_names
-iframework
-image_base -init -install_name -keep_private_externs
-multi_module -multiply_defined -multiply_defined_unused
-noall_load -no_dead_strip_inits_and_terms
-nofixprebinding -nomultidefs -noprebind -noseglinkedit
-pagezero_size -prebind -prebind_all_twolevel_modules
-private_bundle -read_only_relocs -sectalign
-sectobjectsymbols -whyload -seg1addr
-sectcreate -sectobjectsymbols -sectorder
-segaddr -segs_read_only_addr -segs_read_write_addr
-seg_addr_table -seg_addr_table_filename -seglinkedit
-segprot -segs_read_only_addr -segs_read_write_addr
-single_module -static -sub_library -sub_umbrella
-twolevel_namespace -umbrella -undefined
-unexported_symbols_list -weak_reference_mismatches
-whatsloaded -F -gused -gfull -mmacosx-version-min=VERSION
-mkernel -mone-byte-bool
_DEC Alpha Options_
-mno-fp-regs -msoft-float -malpha-as -mgas
-mieee -mieee-with-inexact -mieee-conformant
-mfp-trap-mode=MODE -mfp-rounding-mode=MODE
-mtrap-precision=MODE -mbuild-constants
-mcpu=CPU-TYPE -mtune=CPU-TYPE
-mbwx -mmax -mfix -mcix
-mfloat-vax -mfloat-ieee
-mexplicit-relocs -msmall-data -mlarge-data
-msmall-text -mlarge-text
-mmemory-latency=TIME
_DEC Alpha/VMS Options_
-mvms-return-codes
_FRV Options_
-mgpr-32 -mgpr-64 -mfpr-32 -mfpr-64
-mhard-float -msoft-float
-malloc-cc -mfixed-cc -mdword -mno-dword
-mdouble -mno-double
-mmedia -mno-media -mmuladd -mno-muladd
-mfdpic -minline-plt -mgprel-ro -multilib-library-pic
-mlinked-fp -mlong-calls -malign-labels
-mlibrary-pic -macc-4 -macc-8
-mpack -mno-pack -mno-eflags -mcond-move -mno-cond-move
-moptimize-membar -mno-optimize-membar
-mscc -mno-scc -mcond-exec -mno-cond-exec
-mvliw-branch -mno-vliw-branch
-mmulti-cond-exec -mno-multi-cond-exec -mnested-cond-exec
-mno-nested-cond-exec -mtomcat-stats
-mTLS -mtls
-mcpu=CPU
_GNU/Linux Options_
-muclibc
_H8/300 Options_
-mrelax -mh -ms -mn -mint32 -malign-300
_HPPA Options_
-march=ARCHITECTURE-TYPE
-mbig-switch -mdisable-fpregs -mdisable-indexing
-mfast-indirect-calls -mgas -mgnu-ld -mhp-ld
-mfixed-range=REGISTER-RANGE
-mjump-in-delay -mlinker-opt -mlong-calls
-mlong-load-store -mno-big-switch -mno-disable-fpregs
-mno-disable-indexing -mno-fast-indirect-calls -mno-gas
-mno-jump-in-delay -mno-long-load-store
-mno-portable-runtime -mno-soft-float
-mno-space-regs -msoft-float -mpa-risc-1-0
-mpa-risc-1-1 -mpa-risc-2-0 -mportable-runtime
-mschedule=CPU-TYPE -mspace-regs -msio -mwsio
-munix=UNIX-STD -nolibdld -static -threads
_i386 and x86-64 Options_
-mtune=CPU-TYPE -march=CPU-TYPE
-mfpmath=UNIT
-masm=DIALECT -mno-fancy-math-387
-mno-fp-ret-in-387 -msoft-float
-mno-wide-multiply -mrtd -malign-double
-mpreferred-stack-boundary=NUM -mcld -mcx16 -msahf -mrecip
-mmmx -msse -msse2 -msse3 -mssse3 -msse4.1 -msse4.2 -msse4
-msse4a -m3dnow -mpopcnt -mabm -msse5
-mthreads -mno-align-stringops -minline-all-stringops
-mpush-args -maccumulate-outgoing-args -m128bit-long-double
-m96bit-long-double -mregparm=NUM -msseregparm
-mveclibabi=TYPE -mpc32 -mpc64 -mpc80 -mstackrealign
-momit-leaf-frame-pointer -mno-red-zone -mno-tls-direct-seg-refs
-mcmodel=CODE-MODEL
-m32 -m64 -mlarge-data-threshold=NUM
-mfused-madd -mno-fused-madd
_IA-64 Options_
-mbig-endian -mlittle-endian -mgnu-as -mgnu-ld -mno-pic
-mvolatile-asm-stop -mregister-names -mno-sdata
-mconstant-gp -mauto-pic -minline-float-divide-min-latency
-minline-float-divide-max-throughput
-minline-int-divide-min-latency
-minline-int-divide-max-throughput
-minline-sqrt-min-latency -minline-sqrt-max-throughput
-mno-dwarf2-asm -mearly-stop-bits
-mfixed-range=REGISTER-RANGE -mtls-size=TLS-SIZE
-mtune=CPU-TYPE -mt -pthread -milp32 -mlp64
-mno-sched-br-data-spec -msched-ar-data-spec -mno-sched-control-spec
-msched-br-in-data-spec -msched-ar-in-data-spec -msched-in-control-spec
-msched-ldc -mno-sched-control-ldc -mno-sched-spec-verbose
-mno-sched-prefer-non-data-spec-insns
-mno-sched-prefer-non-control-spec-insns
-mno-sched-count-spec-in-critical-path
_M32R/D Options_
-m32r2 -m32rx -m32r
-mdebug
-malign-loops -mno-align-loops
-missue-rate=NUMBER
-mbranch-cost=NUMBER
-mmodel=CODE-SIZE-MODEL-TYPE
-msdata=SDATA-TYPE
-mno-flush-func -mflush-func=NAME
-mno-flush-trap -mflush-trap=NUMBER
-G NUM
_M32C Options_
-mcpu=CPU -msim -memregs=NUMBER
_M680x0 Options_
-march=ARCH -mcpu=CPU -mtune=TUNE
-m68000 -m68020 -m68020-40 -m68020-60 -m68030 -m68040
-m68060 -mcpu32 -m5200 -m5206e -m528x -m5307 -m5407
-mcfv4e -mbitfield -mno-bitfield -mc68000 -mc68020
-mnobitfield -mrtd -mno-rtd -mdiv -mno-div -mshort
-mno-short -mhard-float -m68881 -msoft-float -mpcrel
-malign-int -mstrict-align -msep-data -mno-sep-data
-mshared-library-id=n -mid-shared-library -mno-id-shared-library
_M68hc1x Options_
-m6811 -m6812 -m68hc11 -m68hc12 -m68hcs12
-mauto-incdec -minmax -mlong-calls -mshort
-msoft-reg-count=COUNT
_MCore Options_
-mhardlit -mno-hardlit -mdiv -mno-div -mrelax-immediates
-mno-relax-immediates -mwide-bitfields -mno-wide-bitfields
-m4byte-functions -mno-4byte-functions -mcallgraph-data
-mno-callgraph-data -mslow-bytes -mno-slow-bytes -mno-lsim
-mlittle-endian -mbig-endian -m210 -m340 -mstack-increment
_MIPS Options_
-EL -EB -march=ARCH -mtune=ARCH
-mips1 -mips2 -mips3 -mips4 -mips32 -mips32r2 -mips64
-mips16 -mno-mips16 -mflip-mips16
-minterlink-mips16 -mno-interlink-mips16
-mabi=ABI -mabicalls -mno-abicalls
-mshared -mno-shared -mxgot -mno-xgot -mgp32 -mgp64
-mfp32 -mfp64 -mhard-float -msoft-float
-msingle-float -mdouble-float -mdsp -mno-dsp -mdspr2 -mno-dspr2
-msmartmips -mno-smartmips
-mpaired-single -mno-paired-single -mdmx -mno-mdmx
-mips3d -mno-mips3d -mmt -mno-mt -mllsc -mno-llsc
-mlong64 -mlong32 -msym32 -mno-sym32
-GNUM -mlocal-sdata -mno-local-sdata
-mextern-sdata -mno-extern-sdata -mgpopt -mno-gopt
-membedded-data -mno-embedded-data
-muninit-const-in-rodata -mno-uninit-const-in-rodata
-mcode-readable=SETTING
-msplit-addresses -mno-split-addresses
-mexplicit-relocs -mno-explicit-relocs
-mcheck-zero-division -mno-check-zero-division
-mdivide-traps -mdivide-breaks
-mmemcpy -mno-memcpy -mlong-calls -mno-long-calls
-mmad -mno-mad -mfused-madd -mno-fused-madd -nocpp
-mfix-r4000 -mno-fix-r4000 -mfix-r4400 -mno-fix-r4400
-mfix-vr4120 -mno-fix-vr4120 -mfix-vr4130 -mno-fix-vr4130
-mfix-sb1 -mno-fix-sb1
-mflush-func=FUNC -mno-flush-func
-mbranch-cost=NUM -mbranch-likely -mno-branch-likely
-mfp-exceptions -mno-fp-exceptions
-mvr4130-align -mno-vr4130-align
_MMIX Options_
-mlibfuncs -mno-libfuncs -mepsilon -mno-epsilon -mabi=gnu
-mabi=mmixware -mzero-extend -mknuthdiv -mtoplevel-symbols
-melf -mbranch-predict -mno-branch-predict -mbase-addresses
-mno-base-addresses -msingle-exit -mno-single-exit
_MN10300 Options_
-mmult-bug -mno-mult-bug
-mam33 -mno-am33
-mam33-2 -mno-am33-2
-mreturn-pointer-on-d0
-mno-crt0 -mrelax
_MT Options_
-mno-crt0 -mbacc -msim
-march=CPU-TYPE
_PDP-11 Options_
-mfpu -msoft-float -mac0 -mno-ac0 -m40 -m45 -m10
-mbcopy -mbcopy-builtin -mint32 -mno-int16
-mint16 -mno-int32 -mfloat32 -mno-float64
-mfloat64 -mno-float32 -mabshi -mno-abshi
-mbranch-expensive -mbranch-cheap
-msplit -mno-split -munix-asm -mdec-asm
_PowerPC Options_ See RS/6000 and PowerPC Options.
_RS/6000 and PowerPC Options_
-mcpu=CPU-TYPE
-mtune=CPU-TYPE
-mpower -mno-power -mpower2 -mno-power2
-mpowerpc -mpowerpc64 -mno-powerpc
-maltivec -mno-altivec
-mpowerpc-gpopt -mno-powerpc-gpopt
-mpowerpc-gfxopt -mno-powerpc-gfxopt
-mmfcrf -mno-mfcrf -mpopcntb -mno-popcntb -mfprnd -mno-fprnd
-mcmpb -mno-cmpb -mmfpgpr -mno-mfpgpr -mhard-dfp -mno-hard-dfp
-mnew-mnemonics -mold-mnemonics
-mfull-toc -mminimal-toc -mno-fp-in-toc -mno-sum-in-toc
-m64 -m32 -mxl-compat -mno-xl-compat -mpe
-malign-power -malign-natural
-msoft-float -mhard-float -mmultiple -mno-multiple
-mstring -mno-string -mupdate -mno-update
-mfused-madd -mno-fused-madd -mbit-align -mno-bit-align
-mstrict-align -mno-strict-align -mrelocatable
-mno-relocatable -mrelocatable-lib -mno-relocatable-lib
-mtoc -mno-toc -mlittle -mlittle-endian -mbig -mbig-endian
-mdynamic-no-pic -maltivec -mswdiv
-mprioritize-restricted-insns=PRIORITY
-msched-costly-dep=DEPENDENCE_TYPE
-minsert-sched-nops=SCHEME
-mcall-sysv -mcall-netbsd
-maix-struct-return -msvr4-struct-return
-mabi=ABI-TYPE -msecure-plt -mbss-plt
-misel -mno-isel
-misel=yes -misel=no
-mspe -mno-spe
-mspe=yes -mspe=no
-mpaired
-mvrsave -mno-vrsave
-mmulhw -mno-mulhw
-mdlmzb -mno-dlmzb
-mfloat-gprs=yes -mfloat-gprs=no -mfloat-gprs=single -mfloat-gprs=double
-mprototype -mno-prototype
-msim -mmvme -mads -myellowknife -memb -msdata
-msdata=OPT -mvxworks -mwindiss -G NUM -pthread
_S/390 and zSeries Options_
-mtune=CPU-TYPE -march=CPU-TYPE
-mhard-float -msoft-float -mhard-dfp -mno-hard-dfp
-mlong-double-64 -mlong-double-128
-mbackchain -mno-backchain -mpacked-stack -mno-packed-stack
-msmall-exec -mno-small-exec -mmvcle -mno-mvcle
-m64 -m31 -mdebug -mno-debug -mesa -mzarch
-mtpf-trace -mno-tpf-trace -mfused-madd -mno-fused-madd
-mwarn-framesize -mwarn-dynamicstack -mstack-size -mstack-guard
_Score Options_
-meb -mel
-mnhwloop
-muls
-mmac
-mscore5 -mscore5u -mscore7 -mscore7d
_SH Options_
-m1 -m2 -m2e -m3 -m3e
-m4-nofpu -m4-single-only -m4-single -m4
-m4a-nofpu -m4a-single-only -m4a-single -m4a -m4al
-m5-64media -m5-64media-nofpu
-m5-32media -m5-32media-nofpu
-m5-compact -m5-compact-nofpu
-mb -ml -mdalign -mrelax
-mbigtable -mfmovd -mhitachi -mrenesas -mno-renesas -mnomacsave
-mieee -misize -minline-ic_invalidate -mpadstruct -mspace
-mprefergot -musermode -multcost=NUMBER -mdiv=STRATEGY
-mdivsi3_libfunc=NAME
-madjust-unroll -mindexed-addressing -mgettrcost=NUMBER -mpt-fixed
-minvalid-symbols
_SPARC Options_
-mcpu=CPU-TYPE
-mtune=CPU-TYPE
-mcmodel=CODE-MODEL
-m32 -m64 -mapp-regs -mno-app-regs
-mfaster-structs -mno-faster-structs
-mfpu -mno-fpu -mhard-float -msoft-float
-mhard-quad-float -msoft-quad-float
-mimpure-text -mno-impure-text -mlittle-endian
-mstack-bias -mno-stack-bias
-munaligned-doubles -mno-unaligned-doubles
-mv8plus -mno-v8plus -mvis -mno-vis
-threads -pthreads -pthread
_SPU Options_
-mwarn-reloc -merror-reloc
-msafe-dma -munsafe-dma
-mbranch-hints
-msmall-mem -mlarge-mem -mstdmain
-mfixed-range=REGISTER-RANGE
_System V Options_
-Qy -Qn -YP,PATHS -Ym,DIR
_V850 Options_
-mlong-calls -mno-long-calls -mep -mno-ep
-mprolog-function -mno-prolog-function -mspace
-mtda=N -msda=N -mzda=N
-mapp-regs -mno-app-regs
-mdisable-callt -mno-disable-callt
-mv850e1
-mv850e
-mv850 -mbig-switch
_VAX Options_
-mg -mgnu -munix
_VxWorks Options_
-mrtp -non-static -Bstatic -Bdynamic
-Xbind-lazy -Xbind-now
_x86-64 Options_ See i386 and x86-64 Options.
_Xstormy16 Options_
-msim
_Xtensa Options_
-mconst16 -mno-const16
-mfused-madd -mno-fused-madd
-mtext-section-literals -mno-text-section-literals
-mtarget-align -mno-target-align
-mlongcalls -mno-longcalls
_zSeries Options_ See S/390 and zSeries Options.
_Code Generation Options_
*Note Options for Code Generation Conventions: Code Gen Options.
-fcall-saved-REG -fcall-used-REG
-ffixed-REG -fexceptions
-fnon-call-exceptions -funwind-tables
-fasynchronous-unwind-tables
-finhibit-size-directive -finstrument-functions
-finstrument-functions-exclude-function-list=SYM,SYM,...
-finstrument-functions-exclude-file-list=FILE,FILE,...
-fno-common -fno-ident
-fpcc-struct-return -fpic -fPIC -fpie -fPIE
-fno-jump-tables
-frecord-gcc-switches
-freg-struct-return -fshort-enums
-fshort-double -fshort-wchar
-fverbose-asm -fpack-struct[=N] -fstack-check
-fstack-limit-register=REG -fstack-limit-symbol=SYM
-fno-stack-limit -fargument-alias -fargument-noalias
-fargument-noalias-global -fargument-noalias-anything
-fleading-underscore -ftls-model=MODEL
-ftrapv -fwrapv -fbounds-check
-fvisibility
* Menu:
* Overall Options:: Controlling the kind of output:
an executable, object files, assembler files,
or preprocessed source.
* C Dialect Options:: Controlling the variant of C language compiled.
* C++ Dialect Options:: Variations on C++.
* Objective-C and Objective-C++ Dialect Options:: Variations on Objective-C
and Objective-C++.
* Language Independent Options:: Controlling how diagnostics should be
formatted.
* Warning Options:: How picky should the compiler be?
* Debugging Options:: Symbol tables, measurements, and debugging dumps.
* Optimize Options:: How much optimization?
* Preprocessor Options:: Controlling header files and macro definitions.
Also, getting dependency information for Make.
* Assembler Options:: Passing options to the assembler.
* Link Options:: Specifying libraries and so on.
* Directory Options:: Where to find header files and libraries.
Where to find the compiler executable files.
* Spec Files:: How to pass switches to sub-processes.
* Target Options:: Running a cross-compiler, or an old version of GCC.

File: gcc.info, Node: Overall Options, Next: Invoking G++, Prev: Option Summary, Up: Invoking GCC
3.2 Options Controlling the Kind of Output
==========================================
Compilation can involve up to four stages: preprocessing, compilation
proper, assembly and linking, always in that order. GCC is capable of
preprocessing and compiling several files either into several assembler
input files, or into one assembler input file; then each assembler input
file produces an object file, and linking combines all the object files
(those newly compiled, and those specified as input) into an executable
file.
For any given input file, the file name suffix determines what kind of
compilation is done:
'FILE.c'
C source code which must be preprocessed.
'FILE.i'
C source code which should not be preprocessed.
'FILE.ii'
C++ source code which should not be preprocessed.
'FILE.m'
Objective-C source code. Note that you must link with the
'libobjc' library to make an Objective-C program work.
'FILE.mi'
Objective-C source code which should not be preprocessed.
'FILE.mm'
'FILE.M'
Objective-C++ source code. Note that you must link with the
'libobjc' library to make an Objective-C++ program work. Note that
'.M' refers to a literal capital M.
'FILE.mii'
Objective-C++ source code which should not be preprocessed.
'FILE.h'
C, C++, Objective-C or Objective-C++ header file to be turned into
a precompiled header.
'FILE.cc'
'FILE.cp'
'FILE.cxx'
'FILE.cpp'
'FILE.CPP'
'FILE.c++'
'FILE.C'
C++ source code which must be preprocessed. Note that in '.cxx',
the last two letters must both be literally 'x'. Likewise, '.C'
refers to a literal capital C.
'FILE.mm'
'FILE.M'
Objective-C++ source code which must be preprocessed.
'FILE.mii'
Objective-C++ source code which should not be preprocessed.
'FILE.hh'
'FILE.H'
'FILE.hp'
'FILE.hxx'
'FILE.hpp'
'FILE.HPP'
'FILE.h++'
'FILE.tcc'
C++ header file to be turned into a precompiled header.
'FILE.f'
'FILE.for'
'FILE.FOR'
Fixed form Fortran source code which should not be preprocessed.
'FILE.F'
'FILE.fpp'
'FILE.FPP'
Fixed form Fortran source code which must be preprocessed (with the
traditional preprocessor).
'FILE.f90'
'FILE.f95'
Free form Fortran source code which should not be preprocessed.
'FILE.F90'
'FILE.F95'
Free form Fortran source code which must be preprocessed (with the
traditional preprocessor).
'FILE.ads'
Ada source code file which contains a library unit declaration (a
declaration of a package, subprogram, or generic, or a generic
instantiation), or a library unit renaming declaration (a package,
generic, or subprogram renaming declaration). Such files are also
called "specs".
'FILE.adb'
'FILE.adb'
Ada source code file containing a library unit body (a subprogram
or package body). Such files are also called "bodies".
'FILE.s'
Assembler code.
'FILE.S'
'FILE.sx'
Assembler code which must be preprocessed.
'OTHER'
An object file to be fed straight into linking. Any file name with
no recognized suffix is treated this way.
You can specify the input language explicitly with the '-x' option:
'-x LANGUAGE'
Specify explicitly the LANGUAGE for the following input files
(rather than letting the compiler choose a default based on the
file name suffix). This option applies to all following input
files until the next '-x' option. Possible values for LANGUAGE
are:
c c-header c-cpp-output
c++ c++-header c++-cpp-output
objective-c objective-c-header objective-c-cpp-output
objective-c++ objective-c++-header objective-c++-cpp-output
assembler assembler-with-cpp
ada
f95 f95-cpp-input
java
treelang
'-x none'
Turn off any specification of a language, so that subsequent files
are handled according to their file name suffixes (as they are if
'-x' has not been used at all).
'-pass-exit-codes'
Normally the 'gcc' program will exit with the code of 1 if any
phase of the compiler returns a non-success return code. If you
specify '-pass-exit-codes', the 'gcc' program will instead return
with numerically highest error produced by any phase that returned
an error indication. The C, C++, and Fortran frontends return 4,
if an internal compiler error is encountered.
If you only want some of the stages of compilation, you can use '-x'
(or filename suffixes) to tell 'gcc' where to start, and one of the
options '-c', '-S', or '-E' to say where 'gcc' is to stop. Note that
some combinations (for example, '-x cpp-output -E') instruct 'gcc' to do
nothing at all.
'-c'
Compile or assemble the source files, but do not link. The linking
stage simply is not done. The ultimate output is in the form of an
object file for each source file.
By default, the object file name for a source file is made by
replacing the suffix '.c', '.i', '.s', etc., with '.o'.
Unrecognized input files, not requiring compilation or assembly,
are ignored.
'-S'
Stop after the stage of compilation proper; do not assemble. The
output is in the form of an assembler code file for each
non-assembler input file specified.
By default, the assembler file name for a source file is made by
replacing the suffix '.c', '.i', etc., with '.s'.
Input files that don't require compilation are ignored.
'-E'
Stop after the preprocessing stage; do not run the compiler proper.
The output is in the form of preprocessed source code, which is
sent to the standard output.
Input files which don't require preprocessing are ignored.
'-o FILE'
Place output in file FILE. This applies regardless to whatever
sort of output is being produced, whether it be an executable file,
an object file, an assembler file or preprocessed C code.
If '-o' is not specified, the default is to put an executable file
in 'a.out', the object file for 'SOURCE.SUFFIX' in 'SOURCE.o', its
assembler file in 'SOURCE.s', a precompiled header file in
'SOURCE.SUFFIX.gch', and all preprocessed C source on standard
output.
'-v'
Print (on standard error output) the commands executed to run the
stages of compilation. Also print the version number of the
compiler driver program and of the preprocessor and the compiler
proper.
'-###'
Like '-v' except the commands are not executed and all command
arguments are quoted. This is useful for shell scripts to capture
the driver-generated command lines.
'-pipe'
Use pipes rather than temporary files for communication between the
various stages of compilation. This fails to work on some systems
where the assembler is unable to read from a pipe; but the GNU
assembler has no trouble.
'-combine'
If you are compiling multiple source files, this option tells the
driver to pass all the source files to the compiler at once (for
those languages for which the compiler can handle this). This will
allow intermodule analysis (IMA) to be performed by the compiler.
Currently the only language for which this is supported is C. If
you pass source files for multiple languages to the driver, using
this option, the driver will invoke the compiler(s) that support
IMA once each, passing each compiler all the source files
appropriate for it. For those languages that do not support IMA
this option will be ignored, and the compiler will be invoked once
for each source file in that language. If you use this option in
conjunction with '-save-temps', the compiler will generate multiple
pre-processed files (one for each source file), but only one
(combined) '.o' or '.s' file.
'--help'
Print (on the standard output) a description of the command line
options understood by 'gcc'. If the '-v' option is also specified
then '--help' will also be passed on to the various processes
invoked by 'gcc', so that they can display the command line options
they accept. If the '-Wextra' option has also been specified
(prior to the '--help' option), then command line options which
have no documentation associated with them will also be displayed.
'--target-help'
Print (on the standard output) a description of target-specific
command line options for each tool. For some targets extra
target-specific information may also be printed.
'--help=CLASS[,QUALIFIER]'
Print (on the standard output) a description of the command line
options understood by the compiler that fit into a specific class.
The class can be one of 'optimizers', 'warnings', 'target',
'params', or LANGUAGE:
'optimizers'
This will display all of the optimization options supported by
the compiler.
'warnings'
This will display all of the options controlling warning
messages produced by the compiler.
'target'
This will display target-specific options. Unlike the
'--target-help' option however, target-specific options of the
linker and assembler will not be displayed. This is because
those tools do not currently support the extended '--help='
syntax.
'params'
This will display the values recognized by the '--param'
option.
LANGUAGE
This will display the options supported for LANGUAGE, where
LANGUAGE is the name of one of the languages supported in this
version of GCC.
'common'
This will display the options that are common to all
languages.
It is possible to further refine the output of the '--help=' option
by adding a comma separated list of qualifiers after the class.
These can be any from the following list:
'undocumented'
Display only those options which are undocumented.
'joined'
Display options which take an argument that appears after an
equal sign in the same continuous piece of text, such as:
'--help=target'.
'separate'
Display options which take an argument that appears as a
separate word following the original option, such as: '-o
output-file'.
Thus for example to display all the undocumented target-specific
switches supported by the compiler the following can be used:
--help=target,undocumented
The sense of a qualifier can be inverted by prefixing it with the ^
character, so for example to display all binary warning options
(i.e., ones that are either on or off and that do not take an
argument), which have a description the following can be used:
--help=warnings,^joined,^undocumented
A class can also be used as a qualifier, although this usually
restricts the output by so much that there is nothing to display.
One case where it does work however is when one of the classes is
TARGET. So for example to display all the target-specific
optimization options the following can be used:
--help=target,optimizers
The '--help=' option can be repeated on the command line. Each
successive use will display its requested class of options,
skipping those that have already been displayed.
If the '-Q' option appears on the command line before the '--help='
option, then the descriptive text displayed by '--help=' is
changed. Instead of describing the displayed options, an
indication is given as to whether the option is enabled, disabled
or set to a specific value (assuming that the compiler knows this
at the point where the '--help=' option is used).
Here is a truncated example from the ARM port of 'gcc':
% gcc -Q -mabi=2 --help=target -c
The following options are target specific:
-mabi= 2
-mabort-on-noreturn [disabled]
-mapcs [disabled]
The output is sensitive to the effects of previous command line
options, so for example it is possible to find out which
optimizations are enabled at '-O2' by using:
-O2 --help=optimizers
Alternatively you can discover which binary optimizations are
enabled by '-O3' by using:
gcc -c -Q -O3 --help=optimizers > /tmp/O3-opts
gcc -c -Q -O2 --help=optimizers > /tmp/O2-opts
diff /tmp/O2-opts /tmp/O3-opts | grep enabled
'--version'
Display the version number and copyrights of the invoked GCC.
'@FILE'
Read command-line options from FILE. The options read are inserted
in place of the original @FILE option. If FILE does not exist, or
cannot be read, then the option will be treated literally, and not
removed.
Options in FILE are separated by whitespace. A whitespace
character may be included in an option by surrounding the entire
option in either single or double quotes. Any character (including
a backslash) may be included by prefixing the character to be
included with a backslash. The FILE may itself contain additional
@FILE options; any such options will be processed recursively.

File: gcc.info, Node: Invoking G++, Next: C Dialect Options, Prev: Overall Options, Up: Invoking GCC
3.3 Compiling C++ Programs
==========================
C++ source files conventionally use one of the suffixes '.C', '.cc',
'.cpp', '.CPP', '.c++', '.cp', or '.cxx'; C++ header files often use
'.hh', '.hpp', '.H', or (for shared template code) '.tcc'; and
preprocessed C++ files use the suffix '.ii'. GCC recognizes files with
these names and compiles them as C++ programs even if you call the
compiler the same way as for compiling C programs (usually with the name
'gcc').
However, the use of 'gcc' does not add the C++ library. 'g++' is a
program that calls GCC and treats '.c', '.h' and '.i' files as C++
source files instead of C source files unless '-x' is used, and
automatically specifies linking against the C++ library. This program
is also useful when precompiling a C header file with a '.h' extension
for use in C++ compilations. On many systems, 'g++' is also installed
with the name 'c++'.
When you compile C++ programs, you may specify many of the same
command-line options that you use for compiling programs in any
language; or command-line options meaningful for C and related
languages; or options that are meaningful only for C++ programs. *Note
Options Controlling C Dialect: C Dialect Options, for explanations of
options for languages related to C. *Note Options Controlling C++
Dialect: C++ Dialect Options, for explanations of options that are
meaningful only for C++ programs.

File: gcc.info, Node: C Dialect Options, Next: C++ Dialect Options, Prev: Invoking G++, Up: Invoking GCC
3.4 Options Controlling C Dialect
=================================
The following options control the dialect of C (or languages derived
from C, such as C++, Objective-C and Objective-C++) that the compiler
accepts:
'-ansi'
In C mode, this is equivalent to '-std=c89'. In C++ mode, it is
equivalent to '-std=c++98'.
This turns off certain features of GCC that are incompatible with
ISO C90 (when compiling C code), or of standard C++ (when compiling
C++ code), such as the 'asm' and 'typeof' keywords, and predefined
macros such as 'unix' and 'vax' that identify the type of system
you are using. It also enables the undesirable and rarely used ISO
trigraph feature. For the C compiler, it disables recognition of
C++ style '//' comments as well as the 'inline' keyword.
The alternate keywords '__asm__', '__extension__', '__inline__' and
'__typeof__' continue to work despite '-ansi'. You would not want
to use them in an ISO C program, of course, but it is useful to put
them in header files that might be included in compilations done
with '-ansi'. Alternate predefined macros such as '__unix__' and
'__vax__' are also available, with or without '-ansi'.
The '-ansi' option does not cause non-ISO programs to be rejected
gratuitously. For that, '-pedantic' is required in addition to
'-ansi'. *Note Warning Options::.
The macro '__STRICT_ANSI__' is predefined when the '-ansi' option
is used. Some header files may notice this macro and refrain from
declaring certain functions or defining certain macros that the ISO
standard doesn't call for; this is to avoid interfering with any
programs that might use these names for other things.
Functions that would normally be built in but do not have semantics
defined by ISO C (such as 'alloca' and 'ffs') are not built-in
functions when '-ansi' is used. *Note Other built-in functions
provided by GCC: Other Builtins, for details of the functions
affected.
'-std='
Determine the language standard. *Note Language Standards
Supported by GCC: Standards, for details of these standard
versions. This option is currently only supported when compiling C
or C++.
The compiler can accept several base standards, such as 'c89' or
'c++98', and GNU dialects of those standards, such as 'gnu89' or
'gnu++98'. By specifing a base standard, the compiler will accept
all programs following that standard and those using GNU extensions
that do not contradict it. For example, '-std=c89' turns off
certain features of GCC that are incompatible with ISO C90, such as
the 'asm' and 'typeof' keywords, but not other GNU extensions that
do not have a meaning in ISO C90, such as omitting the middle term
of a '?:' expression. On the other hand, by specifing a GNU
dialect of a standard, all features the compiler support are
enabled, even when those features change the meaning of the base
standard and some strict-conforming programs may be rejected. The
particular standard is used by '-pedantic' to identify which
features are GNU extensions given that version of the standard.
For example '-std=gnu89 -pedantic' would warn about C++ style '//'
comments, while '-std=gnu99 -pedantic' would not.
A value for this option must be provided; possible values are
'c89'
'iso9899:1990'
Support all ISO C90 programs (certain GNU extensions that
conflict with ISO C90 are disabled). Same as '-ansi' for C
code.
'iso9899:199409'
ISO C90 as modified in amendment 1.
'c99'
'c9x'
'iso9899:1999'
'iso9899:199x'
ISO C99. Note that this standard is not yet fully supported;
see <http://gcc.gnu.org/gcc-4.3/c99status.html> for more
information. The names 'c9x' and 'iso9899:199x' are
deprecated.
'gnu89'
GNU dialect of ISO C90 (including some C99 features). This is
the default for C code.
'gnu99'
'gnu9x'
GNU dialect of ISO C99. When ISO C99 is fully implemented in
GCC, this will become the default. The name 'gnu9x' is
deprecated.
'c++98'
The 1998 ISO C++ standard plus amendments. Same as '-ansi'
for C++ code.
'gnu++98'
GNU dialect of '-std=c++98'. This is the default for C++
code.
'c++0x'
The working draft of the upcoming ISO C++0x standard. This
option enables experimental features that are likely to be
included in C++0x. The working draft is constantly changing,
and any feature that is enabled by this flag may be removed
from future versions of GCC if it is not part of the C++0x
standard.
'gnu++0x'
GNU dialect of '-std=c++0x'. This option enables experimental
features that may be removed in future versions of GCC.
'-fgnu89-inline'
The option '-fgnu89-inline' tells GCC to use the traditional GNU
semantics for 'inline' functions when in C99 mode. *Note An Inline
Function is As Fast As a Macro: Inline. This option is accepted
and ignored by GCC versions 4.1.3 up to but not including 4.3. In
GCC versions 4.3 and later it changes the behavior of GCC in C99
mode. Using this option is roughly equivalent to adding the
'gnu_inline' function attribute to all inline functions (*note
Function Attributes::).
The option '-fno-gnu89-inline' explicitly tells GCC to use the C99
semantics for 'inline' when in C99 or gnu99 mode (i.e., it
specifies the default behavior). This option was first supported
in GCC 4.3. This option is not supported in C89 or gnu89 mode.
The preprocessor macros '__GNUC_GNU_INLINE__' and
'__GNUC_STDC_INLINE__' may be used to check which semantics are in
effect for 'inline' functions. *Note (cpp)Common Predefined
Macros::.
'-aux-info FILENAME'
Output to the given filename prototyped declarations for all
functions declared and/or defined in a translation unit, including
those in header files. This option is silently ignored in any
language other than C.
Besides declarations, the file indicates, in comments, the origin
of each declaration (source file and line), whether the declaration
was implicit, prototyped or unprototyped ('I', 'N' for new or 'O'
for old, respectively, in the first character after the line number
and the colon), and whether it came from a declaration or a
definition ('C' or 'F', respectively, in the following character).
In the case of function definitions, a K&R-style list of arguments
followed by their declarations is also provided, inside comments,
after the declaration.
'-fno-asm'
Do not recognize 'asm', 'inline' or 'typeof' as a keyword, so that
code can use these words as identifiers. You can use the keywords
'__asm__', '__inline__' and '__typeof__' instead. '-ansi' implies
'-fno-asm'.
In C++, this switch only affects the 'typeof' keyword, since 'asm'
and 'inline' are standard keywords. You may want to use the
'-fno-gnu-keywords' flag instead, which has the same effect. In
C99 mode ('-std=c99' or '-std=gnu99'), this switch only affects the
'asm' and 'typeof' keywords, since 'inline' is a standard keyword
in ISO C99.
'-fno-builtin'
'-fno-builtin-FUNCTION'
Don't recognize built-in functions that do not begin with
'__builtin_' as prefix. *Note Other built-in functions provided by
GCC: Other Builtins, for details of the functions affected,
including those which are not built-in functions when '-ansi' or
'-std' options for strict ISO C conformance are used because they
do not have an ISO standard meaning.
GCC normally generates special code to handle certain built-in
functions more efficiently; for instance, calls to 'alloca' may
become single instructions that adjust the stack directly, and
calls to 'memcpy' may become inline copy loops. The resulting code
is often both smaller and faster, but since the function calls no
longer appear as such, you cannot set a breakpoint on those calls,
nor can you change the behavior of the functions by linking with a
different library. In addition, when a function is recognized as a
built-in function, GCC may use information about that function to
warn about problems with calls to that function, or to generate
more efficient code, even if the resulting code still contains
calls to that function. For example, warnings are given with
'-Wformat' for bad calls to 'printf', when 'printf' is built in,
and 'strlen' is known not to modify global memory.
With the '-fno-builtin-FUNCTION' option only the built-in function
FUNCTION is disabled. FUNCTION must not begin with '__builtin_'.
If a function is named this is not built-in in this version of GCC,
this option is ignored. There is no corresponding
'-fbuiltin-FUNCTION' option; if you wish to enable built-in
functions selectively when using '-fno-builtin' or
'-ffreestanding', you may define macros such as:
#define abs(n) __builtin_abs ((n))
#define strcpy(d, s) __builtin_strcpy ((d), (s))
'-fhosted'
Assert that compilation takes place in a hosted environment. This
implies '-fbuiltin'. A hosted environment is one in which the
entire standard library is available, and in which 'main' has a
return type of 'int'. Examples are nearly everything except a
kernel. This is equivalent to '-fno-freestanding'.
'-ffreestanding'
Assert that compilation takes place in a freestanding environment.
This implies '-fno-builtin'. A freestanding environment is one in
which the standard library may not exist, and program startup may
not necessarily be at 'main'. The most obvious example is an OS
kernel. This is equivalent to '-fno-hosted'.
*Note Language Standards Supported by GCC: Standards, for details
of freestanding and hosted environments.
'-fopenmp'
Enable handling of OpenMP directives '#pragma omp' in C/C++ and
'!$omp' in Fortran. When '-fopenmp' is specified, the compiler
generates parallel code according to the OpenMP Application Program
Interface v2.5 <http://www.openmp.org/>. This option implies
'-pthread', and thus is only supported on targets that have support
for '-pthread'.
'-fms-extensions'
Accept some non-standard constructs used in Microsoft header files.
Some cases of unnamed fields in structures and unions are only
accepted with this option. *Note Unnamed struct/union fields
within structs/unions: Unnamed Fields, for details.
'-trigraphs'
Support ISO C trigraphs. The '-ansi' option (and '-std' options
for strict ISO C conformance) implies '-trigraphs'.
'-no-integrated-cpp'
Performs a compilation in two passes: preprocessing and compiling.
This option allows a user supplied "cc1", "cc1plus", or "cc1obj"
via the '-B' option. The user supplied compilation step can then
add in an additional preprocessing step after normal preprocessing
but before compiling. The default is to use the integrated cpp
(internal cpp)
The semantics of this option will change if "cc1", "cc1plus", and
"cc1obj" are merged.
'-traditional'
'-traditional-cpp'
Formerly, these options caused GCC to attempt to emulate a
pre-standard C compiler. They are now only supported with the '-E'
switch. The preprocessor continues to support a pre-standard mode.
See the GNU CPP manual for details.
'-fcond-mismatch'
Allow conditional expressions with mismatched types in the second
and third arguments. The value of such an expression is void.
This option is not supported for C++.
'-flax-vector-conversions'
Allow implicit conversions between vectors with differing numbers
of elements and/or incompatible element types. This option should
not be used for new code.
'-funsigned-char'
Let the type 'char' be unsigned, like 'unsigned char'.
Each kind of machine has a default for what 'char' should be. It
is either like 'unsigned char' by default or like 'signed char' by
default.
Ideally, a portable program should always use 'signed char' or
'unsigned char' when it depends on the signedness of an object.
But many programs have been written to use plain 'char' and expect
it to be signed, or expect it to be unsigned, depending on the
machines they were written for. This option, and its inverse, let
you make such a program work with the opposite default.
The type 'char' is always a distinct type from each of 'signed
char' or 'unsigned char', even though its behavior is always just
like one of those two.
'-fsigned-char'
Let the type 'char' be signed, like 'signed char'.
Note that this is equivalent to '-fno-unsigned-char', which is the
negative form of '-funsigned-char'. Likewise, the option
'-fno-signed-char' is equivalent to '-funsigned-char'.
'-fsigned-bitfields'
'-funsigned-bitfields'
'-fno-signed-bitfields'
'-fno-unsigned-bitfields'
These options control whether a bit-field is signed or unsigned,
when the declaration does not use either 'signed' or 'unsigned'.
By default, such a bit-field is signed, because this is consistent:
the basic integer types such as 'int' are signed types.

File: gcc.info, Node: C++ Dialect Options, Next: Objective-C and Objective-C++ Dialect Options, Prev: C Dialect Options, Up: Invoking GCC
3.5 Options Controlling C++ Dialect
===================================
This section describes the command-line options that are only meaningful
for C++ programs; but you can also use most of the GNU compiler options
regardless of what language your program is in. For example, you might
compile a file 'firstClass.C' like this:
g++ -g -frepo -O -c firstClass.C
In this example, only '-frepo' is an option meant only for C++ programs;
you can use the other options with any language supported by GCC.
Here is a list of options that are _only_ for compiling C++ programs:
'-fabi-version=N'
Use version N of the C++ ABI. Version 2 is the version of the C++
ABI that first appeared in G++ 3.4. Version 1 is the version of
the C++ ABI that first appeared in G++ 3.2. Version 0 will always
be the version that conforms most closely to the C++ ABI
specification. Therefore, the ABI obtained using version 0 will
change as ABI bugs are fixed.
The default is version 2.
'-fno-access-control'
Turn off all access checking. This switch is mainly useful for
working around bugs in the access control code.
'-fcheck-new'
Check that the pointer returned by 'operator new' is non-null
before attempting to modify the storage allocated. This check is
normally unnecessary because the C++ standard specifies that
'operator new' will only return '0' if it is declared 'throw()', in
which case the compiler will always check the return value even
without this option. In all other cases, when 'operator new' has a
non-empty exception specification, memory exhaustion is signalled
by throwing 'std::bad_alloc'. See also 'new (nothrow)'.
'-fconserve-space'
Put uninitialized or runtime-initialized global variables into the
common segment, as C does. This saves space in the executable at
the cost of not diagnosing duplicate definitions. If you compile
with this flag and your program mysteriously crashes after 'main()'
has completed, you may have an object that is being destroyed twice
because two definitions were merged.
This option is no longer useful on most targets, now that support
has been added for putting variables into BSS without making them
common.
'-ffriend-injection'
Inject friend functions into the enclosing namespace, so that they
are visible outside the scope of the class in which they are
declared. Friend functions were documented to work this way in the
old Annotated C++ Reference Manual, and versions of G++ before 4.1
always worked that way. However, in ISO C++ a friend function
which is not declared in an enclosing scope can only be found using
argument dependent lookup. This option causes friends to be
injected as they were in earlier releases.
This option is for compatibility, and may be removed in a future
release of G++.
'-fno-elide-constructors'
The C++ standard allows an implementation to omit creating a
temporary which is only used to initialize another object of the
same type. Specifying this option disables that optimization, and
forces G++ to call the copy constructor in all cases.
'-fno-enforce-eh-specs'
Don't generate code to check for violation of exception
specifications at runtime. This option violates the C++ standard,
but may be useful for reducing code size in production builds, much
like defining 'NDEBUG'. This does not give user code permission to
throw exceptions in violation of the exception specifications; the
compiler will still optimize based on the specifications, so
throwing an unexpected exception will result in undefined behavior.
'-ffor-scope'
'-fno-for-scope'
If '-ffor-scope' is specified, the scope of variables declared in a
for-init-statement is limited to the 'for' loop itself, as
specified by the C++ standard. If '-fno-for-scope' is specified,
the scope of variables declared in a for-init-statement extends to
the end of the enclosing scope, as was the case in old versions of
G++, and other (traditional) implementations of C++.
The default if neither flag is given to follow the standard, but to
allow and give a warning for old-style code that would otherwise be
invalid, or have different behavior.
'-fno-gnu-keywords'
Do not recognize 'typeof' as a keyword, so that code can use this
word as an identifier. You can use the keyword '__typeof__'
instead. '-ansi' implies '-fno-gnu-keywords'.
'-fno-implicit-templates'
Never emit code for non-inline templates which are instantiated
implicitly (i.e. by use); only emit code for explicit
instantiations. *Note Template Instantiation::, for more
information.
'-fno-implicit-inline-templates'
Don't emit code for implicit instantiations of inline templates,
either. The default is to handle inlines differently so that
compiles with and without optimization will need the same set of
explicit instantiations.
'-fno-implement-inlines'
To save space, do not emit out-of-line copies of inline functions
controlled by '#pragma implementation'. This will cause linker
errors if these functions are not inlined everywhere they are
called.
'-fms-extensions'
Disable pedantic warnings about constructs used in MFC, such as
implicit int and getting a pointer to member function via
non-standard syntax.
'-fno-nonansi-builtins'
Disable built-in declarations of functions that are not mandated by
ANSI/ISO C. These include 'ffs', 'alloca', '_exit', 'index',
'bzero', 'conjf', and other related functions.
'-fno-operator-names'
Do not treat the operator name keywords 'and', 'bitand', 'bitor',
'compl', 'not', 'or' and 'xor' as synonyms as keywords.
'-fno-optional-diags'
Disable diagnostics that the standard says a compiler does not need
to issue. Currently, the only such diagnostic issued by G++ is the
one for a name having multiple meanings within a class.
'-fpermissive'
Downgrade some diagnostics about nonconformant code from errors to
warnings. Thus, using '-fpermissive' will allow some nonconforming
code to compile.
'-frepo'
Enable automatic template instantiation at link time. This option
also implies '-fno-implicit-templates'. *Note Template
Instantiation::, for more information.
'-fno-rtti'
Disable generation of information about every class with virtual
functions for use by the C++ runtime type identification features
('dynamic_cast' and 'typeid'). If you don't use those parts of the
language, you can save some space by using this flag. Note that
exception handling uses the same information, but it will generate
it as needed. The 'dynamic_cast' operator can still be used for
casts that do not require runtime type information, i.e. casts to
'void *' or to unambiguous base classes.
'-fstats'
Emit statistics about front-end processing at the end of the
compilation. This information is generally only useful to the G++
development team.
'-ftemplate-depth-N'
Set the maximum instantiation depth for template classes to N. A
limit on the template instantiation depth is needed to detect
endless recursions during template class instantiation. ANSI/ISO
C++ conforming programs must not rely on a maximum depth greater
than 17.
'-fno-threadsafe-statics'
Do not emit the extra code to use the routines specified in the C++
ABI for thread-safe initialization of local statics. You can use
this option to reduce code size slightly in code that doesn't need
to be thread-safe.
'-fuse-cxa-atexit'
Register destructors for objects with static storage duration with
the '__cxa_atexit' function rather than the 'atexit' function.
This option is required for fully standards-compliant handling of
static destructors, but will only work if your C library supports
'__cxa_atexit'.
'-fno-use-cxa-get-exception-ptr'
Don't use the '__cxa_get_exception_ptr' runtime routine. This will
cause 'std::uncaught_exception' to be incorrect, but is necessary
if the runtime routine is not available.
'-fvisibility-inlines-hidden'
This switch declares that the user does not attempt to compare
pointers to inline methods where the addresses of the two functions
were taken in different shared objects.
The effect of this is that GCC may, effectively, mark inline
methods with '__attribute__ ((visibility ("hidden")))' so that they
do not appear in the export table of a DSO and do not require a PLT
indirection when used within the DSO. Enabling this option can
have a dramatic effect on load and link times of a DSO as it
massively reduces the size of the dynamic export table when the
library makes heavy use of templates.
The behavior of this switch is not quite the same as marking the
methods as hidden directly, because it does not affect static
variables local to the function or cause the compiler to deduce
that the function is defined in only one shared object.
You may mark a method as having a visibility explicitly to negate
the effect of the switch for that method. For example, if you do
want to compare pointers to a particular inline method, you might
mark it as having default visibility. Marking the enclosing class
with explicit visibility will have no effect.
Explicitly instantiated inline methods are unaffected by this
option as their linkage might otherwise cross a shared library
boundary. *Note Template Instantiation::.
'-fvisibility-ms-compat'
This flag attempts to use visibility settings to make GCC's C++
linkage model compatible with that of Microsoft Visual Studio.
The flag makes these changes to GCC's linkage model:
1. It sets the default visibility to 'hidden', like
'-fvisibility=hidden'.
2. Types, but not their members, are not hidden by default.
3. The One Definition Rule is relaxed for types without explicit
visibility specifications which are defined in more than one
different shared object: those declarations are permitted if
they would have been permitted when this option was not used.
In new code it is better to use '-fvisibility=hidden' and export
those classes which are intended to be externally visible.
Unfortunately it is possible for code to rely, perhaps
accidentally, on the Visual Studio behavior.
Among the consequences of these changes are that static data
members of the same type with the same name but defined in
different shared objects will be different, so changing one will
not change the other; and that pointers to function members defined
in different shared objects may not compare equal. When this flag
is given, it is a violation of the ODR to define types with the
same name differently.
'-fno-weak'
Do not use weak symbol support, even if it is provided by the
linker. By default, G++ will use weak symbols if they are
available. This option exists only for testing, and should not be
used by end-users; it will result in inferior code and has no
benefits. This option may be removed in a future release of G++.
'-nostdinc++'
Do not search for header files in the standard directories specific
to C++, but do still search the other standard directories. (This
option is used when building the C++ library.)
In addition, these optimization, warning, and code generation options
have meanings only for C++ programs:
'-fno-default-inline'
Do not assume 'inline' for functions defined inside a class scope.
*Note Options That Control Optimization: Optimize Options. Note
that these functions will have linkage like inline functions; they
just won't be inlined by default.
'-Wabi (C++ and Objective-C++ only)'
Warn when G++ generates code that is probably not compatible with
the vendor-neutral C++ ABI. Although an effort has been made to
warn about all such cases, there are probably some cases that are
not warned about, even though G++ is generating incompatible code.
There may also be cases where warnings are emitted even though the
code that is generated will be compatible.
You should rewrite your code to avoid these warnings if you are
concerned about the fact that code generated by G++ may not be
binary compatible with code generated by other compilers.
The known incompatibilities at this point include:
* Incorrect handling of tail-padding for bit-fields. G++ may
attempt to pack data into the same byte as a base class. For
example:
struct A { virtual void f(); int f1 : 1; };
struct B : public A { int f2 : 1; };
In this case, G++ will place 'B::f2' into the same byte
as'A::f1'; other compilers will not. You can avoid this
problem by explicitly padding 'A' so that its size is a
multiple of the byte size on your platform; that will cause
G++ and other compilers to layout 'B' identically.
* Incorrect handling of tail-padding for virtual bases. G++
does not use tail padding when laying out virtual bases. For
example:
struct A { virtual void f(); char c1; };
struct B { B(); char c2; };
struct C : public A, public virtual B {};
In this case, G++ will not place 'B' into the tail-padding for
'A'; other compilers will. You can avoid this problem by
explicitly padding 'A' so that its size is a multiple of its
alignment (ignoring virtual base classes); that will cause G++
and other compilers to layout 'C' identically.
* Incorrect handling of bit-fields with declared widths greater
than that of their underlying types, when the bit-fields
appear in a union. For example:
union U { int i : 4096; };
Assuming that an 'int' does not have 4096 bits, G++ will make
the union too small by the number of bits in an 'int'.
* Empty classes can be placed at incorrect offsets. For
example:
struct A {};
struct B {
A a;
virtual void f ();
};
struct C : public B, public A {};
G++ will place the 'A' base class of 'C' at a nonzero offset;
it should be placed at offset zero. G++ mistakenly believes
that the 'A' data member of 'B' is already at offset zero.
* Names of template functions whose types involve 'typename' or
template template parameters can be mangled incorrectly.
template <typename Q>
void f(typename Q::X) {}
template <template <typename> class Q>
void f(typename Q<int>::X) {}
Instantiations of these templates may be mangled incorrectly.
'-Wctor-dtor-privacy (C++ and Objective-C++ only)'
Warn when a class seems unusable because all the constructors or
destructors in that class are private, and it has neither friends
nor public static member functions.
'-Wnon-virtual-dtor (C++ and Objective-C++ only)'
Warn when a class has virtual functions and accessible non-virtual
destructor, in which case it would be possible but unsafe to delete
an instance of a derived class through a pointer to the base class.
This warning is also enabled if -Weffc++ is specified.
'-Wreorder (C++ and Objective-C++ only)'
Warn when the order of member initializers given in the code does
not match the order in which they must be executed. For instance:
struct A {
int i;
int j;
A(): j (0), i (1) { }
};
The compiler will rearrange the member initializers for 'i' and 'j'
to match the declaration order of the members, emitting a warning
to that effect. This warning is enabled by '-Wall'.
The following '-W...' options are not affected by '-Wall'.
'-Weffc++ (C++ and Objective-C++ only)'
Warn about violations of the following style guidelines from Scott
Meyers' 'Effective C++' book:
* Item 11: Define a copy constructor and an assignment operator
for classes with dynamically allocated memory.
* Item 12: Prefer initialization to assignment in constructors.
* Item 14: Make destructors virtual in base classes.
* Item 15: Have 'operator=' return a reference to '*this'.
* Item 23: Don't try to return a reference when you must return
an object.
Also warn about violations of the following style guidelines from
Scott Meyers' 'More Effective C++' book:
* Item 6: Distinguish between prefix and postfix forms of
increment and decrement operators.
* Item 7: Never overload '&&', '||', or ','.
When selecting this option, be aware that the standard library
headers do not obey all of these guidelines; use 'grep -v' to
filter out those warnings.
'-Wno-deprecated (C++ and Objective-C++ only)'
Do not warn about usage of deprecated features. *Note Deprecated
Features::.
'-Wstrict-null-sentinel (C++ and Objective-C++ only)'
Warn also about the use of an uncasted 'NULL' as sentinel. When
compiling only with GCC this is a valid sentinel, as 'NULL' is
defined to '__null'. Although it is a null pointer constant not a
null pointer, it is guaranteed to of the same size as a pointer.
But this use is not portable across different compilers.
'-Wno-non-template-friend (C++ and Objective-C++ only)'
Disable warnings when non-templatized friend functions are declared
within a template. Since the advent of explicit template
specification support in G++, if the name of the friend is an
unqualified-id (i.e., 'friend foo(int)'), the C++ language
specification demands that the friend declare or define an
ordinary, nontemplate function. (Section 14.5.3). Before G++
implemented explicit specification, unqualified-ids could be
interpreted as a particular specialization of a templatized
function. Because this non-conforming behavior is no longer the
default behavior for G++, '-Wnon-template-friend' allows the
compiler to check existing code for potential trouble spots and is
on by default. This new compiler behavior can be turned off with
'-Wno-non-template-friend' which keeps the conformant compiler code
but disables the helpful warning.
'-Wold-style-cast (C++ and Objective-C++ only)'
Warn if an old-style (C-style) cast to a non-void type is used
within a C++ program. The new-style casts ('dynamic_cast',
'static_cast', 'reinterpret_cast', and 'const_cast') are less
vulnerable to unintended effects and much easier to search for.
'-Woverloaded-virtual (C++ and Objective-C++ only)'
Warn when a function declaration hides virtual functions from a
base class. For example, in:
struct A {
virtual void f();
};
struct B: public A {
void f(int);
};
the 'A' class version of 'f' is hidden in 'B', and code like:
B* b;
b->f();
will fail to compile.
'-Wno-pmf-conversions (C++ and Objective-C++ only)'
Disable the diagnostic for converting a bound pointer to member
function to a plain pointer.
'-Wsign-promo (C++ and Objective-C++ only)'
Warn when overload resolution chooses a promotion from unsigned or
enumerated type to a signed type, over a conversion to an unsigned
type of the same size. Previous versions of G++ would try to
preserve unsignedness, but the standard mandates the current
behavior.
struct A {
operator int ();
A& operator = (int);
};
main ()
{
A a,b;
a = b;
}
In this example, G++ will synthesize a default 'A& operator =
(const A&);', while cfront will use the user-defined 'operator ='.

File: gcc.info, Node: Objective-C and Objective-C++ Dialect Options, Next: Language Independent Options, Prev: C++ Dialect Options, Up: Invoking GCC
3.6 Options Controlling Objective-C and Objective-C++ Dialects
==============================================================
(NOTE: This manual does not describe the Objective-C and Objective-C++
languages themselves. See *Note Language Standards Supported by GCC:
Standards, for references.)
This section describes the command-line options that are only
meaningful for Objective-C and Objective-C++ programs, but you can also
use most of the language-independent GNU compiler options. For example,
you might compile a file 'some_class.m' like this:
gcc -g -fgnu-runtime -O -c some_class.m
In this example, '-fgnu-runtime' is an option meant only for Objective-C
and Objective-C++ programs; you can use the other options with any
language supported by GCC.
Note that since Objective-C is an extension of the C language,
Objective-C compilations may also use options specific to the C
front-end (e.g., '-Wtraditional'). Similarly, Objective-C++
compilations may use C++-specific options (e.g., '-Wabi').
Here is a list of options that are _only_ for compiling Objective-C and
Objective-C++ programs:
'-fconstant-string-class=CLASS-NAME'
Use CLASS-NAME as the name of the class to instantiate for each
literal string specified with the syntax '@"..."'. The default
class name is 'NXConstantString' if the GNU runtime is being used,
and 'NSConstantString' if the NeXT runtime is being used (see
below). The '-fconstant-cfstrings' option, if also present, will
override the '-fconstant-string-class' setting and cause '@"..."'
literals to be laid out as constant CoreFoundation strings.
'-fgnu-runtime'
Generate object code compatible with the standard GNU Objective-C
runtime. This is the default for most types of systems.
'-fnext-runtime'
Generate output compatible with the NeXT runtime. This is the
default for NeXT-based systems, including Darwin and Mac OS X. The
macro '__NEXT_RUNTIME__' is predefined if (and only if) this option
is used.
'-fno-nil-receivers'
Assume that all Objective-C message dispatches (e.g., '[receiver
message:arg]') in this translation unit ensure that the receiver is
not 'nil'. This allows for more efficient entry points in the
runtime to be used. Currently, this option is only available in
conjunction with the NeXT runtime on Mac OS X 10.3 and later.
'-fobjc-call-cxx-cdtors'
For each Objective-C class, check if any of its instance variables
is a C++ object with a non-trivial default constructor. If so,
synthesize a special '- (id) .cxx_construct' instance method that
will run non-trivial default constructors on any such instance
variables, in order, and then return 'self'. Similarly, check if
any instance variable is a C++ object with a non-trivial
destructor, and if so, synthesize a special '- (void)
.cxx_destruct' method that will run all such default destructors,
in reverse order.
The '- (id) .cxx_construct' and/or '- (void) .cxx_destruct' methods
thusly generated will only operate on instance variables declared
in the current Objective-C class, and not those inherited from
superclasses. It is the responsibility of the Objective-C runtime
to invoke all such methods in an object's inheritance hierarchy.
The '- (id) .cxx_construct' methods will be invoked by the runtime
immediately after a new object instance is allocated; the '- (void)
.cxx_destruct' methods will be invoked immediately before the
runtime deallocates an object instance.
As of this writing, only the NeXT runtime on Mac OS X 10.4 and
later has support for invoking the '- (id) .cxx_construct' and '-
(void) .cxx_destruct' methods.
'-fobjc-direct-dispatch'
Allow fast jumps to the message dispatcher. On Darwin this is
accomplished via the comm page.
'-fobjc-exceptions'
Enable syntactic support for structured exception handling in
Objective-C, similar to what is offered by C++ and Java. This
option is unavailable in conjunction with the NeXT runtime on Mac
OS X 10.2 and earlier.
@try {
...
@throw expr;
...
}
@catch (AnObjCClass *exc) {
...
@throw expr;
...
@throw;
...
}
@catch (AnotherClass *exc) {
...
}
@catch (id allOthers) {
...
}
@finally {
...
@throw expr;
...
}
The '@throw' statement may appear anywhere in an Objective-C or
Objective-C++ program; when used inside of a '@catch' block, the
'@throw' may appear without an argument (as shown above), in which
case the object caught by the '@catch' will be rethrown.
Note that only (pointers to) Objective-C objects may be thrown and
caught using this scheme. When an object is thrown, it will be
caught by the nearest '@catch' clause capable of handling objects
of that type, analogously to how 'catch' blocks work in C++ and
Java. A '@catch(id ...)' clause (as shown above) may also be
provided to catch any and all Objective-C exceptions not caught by
previous '@catch' clauses (if any).
The '@finally' clause, if present, will be executed upon exit from
the immediately preceding '@try ... @catch' section. This will
happen regardless of whether any exceptions are thrown, caught or
rethrown inside the '@try ... @catch' section, analogously to the
behavior of the 'finally' clause in Java.
There are several caveats to using the new exception mechanism:
* Although currently designed to be binary compatible with
'NS_HANDLER'-style idioms provided by the 'NSException' class,
the new exceptions can only be used on Mac OS X 10.3 (Panther)
and later systems, due to additional functionality needed in
the (NeXT) Objective-C runtime.
* As mentioned above, the new exceptions do not support handling
types other than Objective-C objects. Furthermore, when used
from Objective-C++, the Objective-C exception model does not
interoperate with C++ exceptions at this time. This means you
cannot '@throw' an exception from Objective-C and 'catch' it
in C++, or vice versa (i.e., 'throw ... @catch').
The '-fobjc-exceptions' switch also enables the use of
synchronization blocks for thread-safe execution:
@synchronized (ObjCClass *guard) {
...
}
Upon entering the '@synchronized' block, a thread of execution
shall first check whether a lock has been placed on the
corresponding 'guard' object by another thread. If it has, the
current thread shall wait until the other thread relinquishes its
lock. Once 'guard' becomes available, the current thread will
place its own lock on it, execute the code contained in the
'@synchronized' block, and finally relinquish the lock (thereby
making 'guard' available to other threads).
Unlike Java, Objective-C does not allow for entire methods to be
marked '@synchronized'. Note that throwing exceptions out of
'@synchronized' blocks is allowed, and will cause the guarding
object to be unlocked properly.
'-fobjc-gc'
Enable garbage collection (GC) in Objective-C and Objective-C++
programs.
'-freplace-objc-classes'
Emit a special marker instructing 'ld(1)' not to statically link in
the resulting object file, and allow 'dyld(1)' to load it in at run
time instead. This is used in conjunction with the
Fix-and-Continue debugging mode, where the object file in question
may be recompiled and dynamically reloaded in the course of program
execution, without the need to restart the program itself.
Currently, Fix-and-Continue functionality is only available in
conjunction with the NeXT runtime on Mac OS X 10.3 and later.
'-fzero-link'
When compiling for the NeXT runtime, the compiler ordinarily
replaces calls to 'objc_getClass("...")' (when the name of the
class is known at compile time) with static class references that
get initialized at load time, which improves run-time performance.
Specifying the '-fzero-link' flag suppresses this behavior and
causes calls to 'objc_getClass("...")' to be retained. This is
useful in Zero-Link debugging mode, since it allows for individual
class implementations to be modified during program execution.
'-gen-decls'
Dump interface declarations for all classes seen in the source file
to a file named 'SOURCENAME.decl'.
'-Wassign-intercept (Objective-C and Objective-C++ only)'
Warn whenever an Objective-C assignment is being intercepted by the
garbage collector.
'-Wno-protocol (Objective-C and Objective-C++ only)'
If a class is declared to implement a protocol, a warning is issued
for every method in the protocol that is not implemented by the
class. The default behavior is to issue a warning for every method
not explicitly implemented in the class, even if a method
implementation is inherited from the superclass. If you use the
'-Wno-protocol' option, then methods inherited from the superclass
are considered to be implemented, and no warning is issued for
them.
'-Wselector (Objective-C and Objective-C++ only)'
Warn if multiple methods of different types for the same selector
are found during compilation. The check is performed on the list
of methods in the final stage of compilation. Additionally, a
check is performed for each selector appearing in a
'@selector(...)' expression, and a corresponding method for that
selector has been found during compilation. Because these checks
scan the method table only at the end of compilation, these
warnings are not produced if the final stage of compilation is not
reached, for example because an error is found during compilation,
or because the '-fsyntax-only' option is being used.
'-Wstrict-selector-match (Objective-C and Objective-C++ only)'
Warn if multiple methods with differing argument and/or return
types are found for a given selector when attempting to send a
message using this selector to a receiver of type 'id' or 'Class'.
When this flag is off (which is the default behavior), the compiler
will omit such warnings if any differences found are confined to
types which share the same size and alignment.
'-Wundeclared-selector (Objective-C and Objective-C++ only)'
Warn if a '@selector(...)' expression referring to an undeclared
selector is found. A selector is considered undeclared if no
method with that name has been declared before the '@selector(...)'
expression, either explicitly in an '@interface' or '@protocol'
declaration, or implicitly in an '@implementation' section. This
option always performs its checks as soon as a '@selector(...)'
expression is found, while '-Wselector' only performs its checks in
the final stage of compilation. This also enforces the coding
style convention that methods and selectors must be declared before
being used.
'-print-objc-runtime-info'
Generate C header describing the largest structure that is passed
by value, if any.

File: gcc.info, Node: Language Independent Options, Next: Warning Options, Prev: Objective-C and Objective-C++ Dialect Options, Up: Invoking GCC
3.7 Options to Control Diagnostic Messages Formatting
=====================================================
Traditionally, diagnostic messages have been formatted irrespective of
the output device's aspect (e.g. its width, ...). The options described
below can be used to control the diagnostic messages formatting
algorithm, e.g. how many characters per line, how often source location
information should be reported. Right now, only the C++ front end can
honor these options. However it is expected, in the near future, that
the remaining front ends would be able to digest them correctly.
'-fmessage-length=N'
Try to format error messages so that they fit on lines of about N
characters. The default is 72 characters for 'g++' and 0 for the
rest of the front ends supported by GCC. If N is zero, then no
line-wrapping will be done; each error message will appear on a
single line.
'-fdiagnostics-show-location=once'
Only meaningful in line-wrapping mode. Instructs the diagnostic
messages reporter to emit _once_ source location information; that
is, in case the message is too long to fit on a single physical
line and has to be wrapped, the source location won't be emitted
(as prefix) again, over and over, in subsequent continuation lines.
This is the default behavior.
'-fdiagnostics-show-location=every-line'
Only meaningful in line-wrapping mode. Instructs the diagnostic
messages reporter to emit the same source location information (as
prefix) for physical lines that result from the process of breaking
a message which is too long to fit on a single line.
'-fdiagnostics-show-option'
This option instructs the diagnostic machinery to add text to each
diagnostic emitted, which indicates which command line option
directly controls that diagnostic, when such an option is known to
the diagnostic machinery.
'-Wcoverage-mismatch'
Warn if feedback profiles do not match when using the
'-fprofile-use' option. If a source file was changed between
'-fprofile-gen' and '-fprofile-use', the files with the profile
feedback can fail to match the source file and GCC can not use the
profile feedback information. By default, GCC emits an error
message in this case. The option '-Wcoverage-mismatch' emits a
warning instead of an error. GCC does not use appropriate feedback
profiles, so using this option can result in poorly optimized code.
This option is useful only in the case of very minor changes such
as bug fixes to an existing code-base.

File: gcc.info, Node: Warning Options, Next: Debugging Options, Prev: Language Independent Options, Up: Invoking GCC
3.8 Options to Request or Suppress Warnings
===========================================
Warnings are diagnostic messages that report constructions which are not
inherently erroneous but which are risky or suggest there may have been
an error.
The following language-independent options do not enable specific
warnings but control the kinds of diagnostics produced by GCC.
'-fsyntax-only'
Check the code for syntax errors, but don't do anything beyond
that.
'-w'
Inhibit all warning messages.
'-Werror'
Make all warnings into errors.
'-Werror='
Make the specified warning into an error. The specifier for a
warning is appended, for example '-Werror=switch' turns the
warnings controlled by '-Wswitch' into errors. This switch takes a
negative form, to be used to negate '-Werror' for specific
warnings, for example '-Wno-error=switch' makes '-Wswitch' warnings
not be errors, even when '-Werror' is in effect. You can use the
'-fdiagnostics-show-option' option to have each controllable
warning amended with the option which controls it, to determine
what to use with this option.
Note that specifying '-Werror='FOO automatically implies '-W'FOO.
However, '-Wno-error='FOO does not imply anything.
'-Wfatal-errors'
This option causes the compiler to abort compilation on the first
error occurred rather than trying to keep going and printing
further error messages.
You can request many specific warnings with options beginning '-W', for
example '-Wimplicit' to request warnings on implicit declarations. Each
of these specific warning options also has a negative form beginning
'-Wno-' to turn off warnings; for example, '-Wno-implicit'. This manual
lists only one of the two forms, whichever is not the default. For
further, language-specific options also refer to *note C++ Dialect
Options:: and *note Objective-C and Objective-C++ Dialect Options::.
'-pedantic'
Issue all the warnings demanded by strict ISO C and ISO C++; reject
all programs that use forbidden extensions, and some other programs
that do not follow ISO C and ISO C++. For ISO C, follows the
version of the ISO C standard specified by any '-std' option used.
Valid ISO C and ISO C++ programs should compile properly with or
without this option (though a rare few will require '-ansi' or a
'-std' option specifying the required version of ISO C). However,
without this option, certain GNU extensions and traditional C and
C++ features are supported as well. With this option, they are
rejected.
'-pedantic' does not cause warning messages for use of the
alternate keywords whose names begin and end with '__'. Pedantic
warnings are also disabled in the expression that follows
'__extension__'. However, only system header files should use
these escape routes; application programs should avoid them. *Note
Alternate Keywords::.
Some users try to use '-pedantic' to check programs for strict ISO
C conformance. They soon find that it does not do quite what they
want: it finds some non-ISO practices, but not all--only those for
which ISO C _requires_ a diagnostic, and some others for which
diagnostics have been added.
A feature to report any failure to conform to ISO C might be useful
in some instances, but would require considerable additional work
and would be quite different from '-pedantic'. We don't have plans
to support such a feature in the near future.
Where the standard specified with '-std' represents a GNU extended
dialect of C, such as 'gnu89' or 'gnu99', there is a corresponding
"base standard", the version of ISO C on which the GNU extended
dialect is based. Warnings from '-pedantic' are given where they
are required by the base standard. (It would not make sense for
such warnings to be given only for features not in the specified
GNU C dialect, since by definition the GNU dialects of C include
all features the compiler supports with the given option, and there
would be nothing to warn about.)
'-pedantic-errors'
Like '-pedantic', except that errors are produced rather than
warnings.
'-Wall'
This enables all the warnings about constructions that some users
consider questionable, and that are easy to avoid (or modify to
prevent the warning), even in conjunction with macros. This also
enables some language-specific warnings described in *note C++
Dialect Options:: and *note Objective-C and Objective-C++ Dialect
Options::.
'-Wall' turns on the following warning flags:
-Waddress
-Warray-bounds (only with -O2)
-Wc++0x-compat
-Wchar-subscripts
-Wimplicit-int
-Wimplicit-function-declaration
-Wcomment
-Wformat
-Wmain (only for C/ObjC and unless -ffreestanding)
-Wmissing-braces
-Wnonnull
-Wparentheses
-Wpointer-sign
-Wreorder
-Wreturn-type
-Wsequence-point
-Wsign-compare (only in C++)
-Wstrict-aliasing
-Wstrict-overflow=1
-Wswitch
-Wtrigraphs
-Wuninitialized (only with -O1 and above)
-Wunknown-pragmas
-Wunused-function
-Wunused-label
-Wunused-value
-Wunused-variable
Note that some warning flags are not implied by '-Wall'. Some of
them warn about constructions that users generally do not consider
questionable, but which occasionally you might wish to check for;
others warn about constructions that are necessary or hard to avoid
in some cases, and there is no simple way to modify the code to
suppress the warning. Some of them are enabled by '-Wextra' but
many of them must be enabled individually.
'-Wextra'
This enables some extra warning flags that are not enabled by
'-Wall'. (This option used to be called '-W'. The older name is
still supported, but the newer name is more descriptive.)
-Wclobbered
-Wempty-body
-Wignored-qualifiers
-Wmissing-field-initializers
-Wmissing-parameter-type (C only)
-Wold-style-declaration (C only)
-Woverride-init
-Wsign-compare
-Wtype-limits
-Wuninitialized (only with -O1 and above)
-Wunused-parameter (only with -Wunused or -Wall)
The option '-Wextra' also prints warning messages for the following
cases:
* A pointer is compared against integer zero with '<', '<=',
'>', or '>='.
* (C++ only) An enumerator and a non-enumerator both appear in a
conditional expression.
* (C++ only) A non-static reference or non-static 'const' member
appears in a class without constructors.
* (C++ only) Ambiguous virtual bases.
* (C++ only) Subscripting an array which has been declared
'register'.
* (C++ only) Taking the address of a variable which has been
declared 'register'.
* (C++ only) A base class is not initialized in a derived class'
copy constructor.
'-Wno-import'
Inhibit warning messages about the use of '#import'.
'-Wchar-subscripts'
Warn if an array subscript has type 'char'. This is a common cause
of error, as programmers often forget that this type is signed on
some machines. This warning is enabled by '-Wall'.
'-Wcomment'
Warn whenever a comment-start sequence '/*' appears in a '/*'
comment, or whenever a Backslash-Newline appears in a '//' comment.
This warning is enabled by '-Wall'.
'-Wformat'
Check calls to 'printf' and 'scanf', etc., to make sure that the
arguments supplied have types appropriate to the format string
specified, and that the conversions specified in the format string
make sense. This includes standard functions, and others specified
by format attributes (*note Function Attributes::), in the
'printf', 'scanf', 'strftime' and 'strfmon' (an X/Open extension,
not in the C standard) families (or other target-specific
families). Which functions are checked without format attributes
having been specified depends on the standard version selected, and
such checks of functions without the attribute specified are
disabled by '-ffreestanding' or '-fno-builtin'.
The formats are checked against the format features supported by
GNU libc version 2.2. These include all ISO C90 and C99 features,
as well as features from the Single Unix Specification and some BSD
and GNU extensions. Other library implementations may not support
all these features; GCC does not support warning about features
that go beyond a particular library's limitations. However, if
'-pedantic' is used with '-Wformat', warnings will be given about
format features not in the selected standard version (but not for
'strfmon' formats, since those are not in any version of the C
standard). *Note Options Controlling C Dialect: C Dialect Options.
Since '-Wformat' also checks for null format arguments for several
functions, '-Wformat' also implies '-Wnonnull'.
'-Wformat' is included in '-Wall'. For more control over some
aspects of format checking, the options '-Wformat-y2k',
'-Wno-format-extra-args', '-Wno-format-zero-length',
'-Wformat-nonliteral', '-Wformat-security', and '-Wformat=2' are
available, but are not included in '-Wall'.
'-Wformat-y2k'
If '-Wformat' is specified, also warn about 'strftime' formats
which may yield only a two-digit year.
'-Wno-format-extra-args'
If '-Wformat' is specified, do not warn about excess arguments to a
'printf' or 'scanf' format function. The C standard specifies that
such arguments are ignored.
Where the unused arguments lie between used arguments that are
specified with '$' operand number specifications, normally warnings
are still given, since the implementation could not know what type
to pass to 'va_arg' to skip the unused arguments. However, in the
case of 'scanf' formats, this option will suppress the warning if
the unused arguments are all pointers, since the Single Unix
Specification says that such unused arguments are allowed.
'-Wno-format-zero-length (C and Objective-C only)'
If '-Wformat' is specified, do not warn about zero-length formats.
The C standard specifies that zero-length formats are allowed.
'-Wformat-nonliteral'
If '-Wformat' is specified, also warn if the format string is not a
string literal and so cannot be checked, unless the format function
takes its format arguments as a 'va_list'.
'-Wformat-security'
If '-Wformat' is specified, also warn about uses of format
functions that represent possible security problems. At present,
this warns about calls to 'printf' and 'scanf' functions where the
format string is not a string literal and there are no format
arguments, as in 'printf (foo);'. This may be a security hole if
the format string came from untrusted input and contains '%n'.
(This is currently a subset of what '-Wformat-nonliteral' warns
about, but in future warnings may be added to '-Wformat-security'
that are not included in '-Wformat-nonliteral'.)
'-Wformat=2'
Enable '-Wformat' plus format checks not included in '-Wformat'.
Currently equivalent to '-Wformat -Wformat-nonliteral
-Wformat-security -Wformat-y2k'.
'-Wnonnull (C and Objective-C only)'
Warn about passing a null pointer for arguments marked as requiring
a non-null value by the 'nonnull' function attribute.
'-Wnonnull' is included in '-Wall' and '-Wformat'. It can be
disabled with the '-Wno-nonnull' option.
'-Winit-self (C, C++, Objective-C and Objective-C++ only)'
Warn about uninitialized variables which are initialized with
themselves. Note this option can only be used with the
'-Wuninitialized' option, which in turn only works with '-O1' and
above.
For example, GCC will warn about 'i' being uninitialized in the
following snippet only when '-Winit-self' has been specified:
int f()
{
int i = i;
return i;
}
'-Wimplicit-int (C and Objective-C only)'
Warn when a declaration does not specify a type. This warning is
enabled by '-Wall'.
'-Wimplicit-function-declaration (C and Objective-C only)'
Give a warning whenever a function is used before being declared.
In C99 mode ('-std=c99' or '-std=gnu99'), this warning is enabled
by default and it is made into an error by '-pedantic-errors'.
This warning is also enabled by '-Wall'.
'-Wimplicit'
Same as '-Wimplicit-int' and '-Wimplicit-function-declaration'.
This warning is enabled by '-Wall'.
'-Wignored-qualifiers (C and C++ only)'
Warn if the return type of a function has a type qualifier such as
'const'. For ISO C such a type qualifier has no effect, since the
value returned by a function is not an lvalue. For C++, the
warning is only emitted for scalar types or 'void'. ISO C
prohibits qualified 'void' return types on function definitions, so
such return types always receive a warning even without this
option.
This warning is also enabled by '-Wextra'.
'-Wmain'
Warn if the type of 'main' is suspicious. 'main' should be a
function with external linkage, returning int, taking either zero
arguments, two, or three arguments of appropriate types. This
warning is enabled by '-Wall'.
'-Wmissing-braces'
Warn if an aggregate or union initializer is not fully bracketed.
In the following example, the initializer for 'a' is not fully
bracketed, but that for 'b' is fully bracketed.
int a[2][2] = { 0, 1, 2, 3 };
int b[2][2] = { { 0, 1 }, { 2, 3 } };
This warning is enabled by '-Wall'.
'-Wmissing-include-dirs (C, C++, Objective-C and Objective-C++ only)'
Warn if a user-supplied include directory does not exist.
'-Wparentheses'
Warn if parentheses are omitted in certain contexts, such as when
there is an assignment in a context where a truth value is
expected, or when operators are nested whose precedence people
often get confused about.
Also warn if a comparison like 'x<=y<=z' appears; this is
equivalent to '(x<=y ? 1 : 0) <= z', which is a different
interpretation from that of ordinary mathematical notation.
Also warn about constructions where there may be confusion to which
'if' statement an 'else' branch belongs. Here is an example of
such a case:
{
if (a)
if (b)
foo ();
else
bar ();
}
In C/C++, every 'else' branch belongs to the innermost possible
'if' statement, which in this example is 'if (b)'. This is often
not what the programmer expected, as illustrated in the above
example by indentation the programmer chose. When there is the
potential for this confusion, GCC will issue a warning when this
flag is specified. To eliminate the warning, add explicit braces
around the innermost 'if' statement so there is no way the 'else'
could belong to the enclosing 'if'. The resulting code would look
like this:
{
if (a)
{
if (b)
foo ();
else
bar ();
}
}
This warning is enabled by '-Wall'.
'-Wsequence-point'
Warn about code that may have undefined semantics because of
violations of sequence point rules in the C and C++ standards.
The C and C++ standards defines the order in which expressions in a
C/C++ program are evaluated in terms of "sequence points", which
represent a partial ordering between the execution of parts of the
program: those executed before the sequence point, and those
executed after it. These occur after the evaluation of a full
expression (one which is not part of a larger expression), after
the evaluation of the first operand of a '&&', '||', '? :' or ','
(comma) operator, before a function is called (but after the
evaluation of its arguments and the expression denoting the called
function), and in certain other places. Other than as expressed by
the sequence point rules, the order of evaluation of subexpressions
of an expression is not specified. All these rules describe only a
partial order rather than a total order, since, for example, if two
functions are called within one expression with no sequence point
between them, the order in which the functions are called is not
specified. However, the standards committee have ruled that
function calls do not overlap.
It is not specified when between sequence points modifications to
the values of objects take effect. Programs whose behavior depends
on this have undefined behavior; the C and C++ standards specify
that "Between the previous and next sequence point an object shall
have its stored value modified at most once by the evaluation of an
expression. Furthermore, the prior value shall be read only to
determine the value to be stored.". If a program breaks these
rules, the results on any particular implementation are entirely
unpredictable.
Examples of code with undefined behavior are 'a = a++;', 'a[n] =
b[n++]' and 'a[i++] = i;'. Some more complicated cases are not
diagnosed by this option, and it may give an occasional false
positive result, but in general it has been found fairly effective
at detecting this sort of problem in programs.
The standard is worded confusingly, therefore there is some debate
over the precise meaning of the sequence point rules in subtle
cases. Links to discussions of the problem, including proposed
formal definitions, may be found on the GCC readings page, at
<http://gcc.gnu.org/readings.html>.
This warning is enabled by '-Wall' for C and C++.
'-Wreturn-type'
Warn whenever a function is defined with a return-type that
defaults to 'int'. Also warn about any 'return' statement with no
return-value in a function whose return-type is not 'void' (falling
off the end of the function body is considered returning without a
value), and about a 'return' statement with a expression in a
function whose return-type is 'void'.
For C++, a function without return type always produces a
diagnostic message, even when '-Wno-return-type' is specified. The
only exceptions are 'main' and functions defined in system headers.
This warning is enabled by '-Wall'.
'-Wswitch'
Warn whenever a 'switch' statement has an index of enumerated type
and lacks a 'case' for one or more of the named codes of that
enumeration. (The presence of a 'default' label prevents this
warning.) 'case' labels outside the enumeration range also provoke
warnings when this option is used. This warning is enabled by
'-Wall'.
'-Wswitch-default'
Warn whenever a 'switch' statement does not have a 'default' case.
'-Wswitch-enum'
Warn whenever a 'switch' statement has an index of enumerated type
and lacks a 'case' for one or more of the named codes of that
enumeration. 'case' labels outside the enumeration range also
provoke warnings when this option is used.
'-Wtrigraphs'
Warn if any trigraphs are encountered that might change the meaning
of the program (trigraphs within comments are not warned about).
This warning is enabled by '-Wall'.
'-Wunused-function'
Warn whenever a static function is declared but not defined or a
non-inline static function is unused. This warning is enabled by
'-Wall'.
'-Wunused-label'
Warn whenever a label is declared but not used. This warning is
enabled by '-Wall'.
To suppress this warning use the 'unused' attribute (*note Variable
Attributes::).
'-Wunused-parameter'
Warn whenever a function parameter is unused aside from its
declaration.
To suppress this warning use the 'unused' attribute (*note Variable
Attributes::).
'-Wunused-variable'
Warn whenever a local variable or non-constant static variable is
unused aside from its declaration. This warning is enabled by
'-Wall'.
To suppress this warning use the 'unused' attribute (*note Variable
Attributes::).
'-Wunused-value'
Warn whenever a statement computes a result that is explicitly not
used. To suppress this warning cast the unused expression to
'void'. This includes an expression-statement or the left-hand
side of a comma expression that contains no side effects. For
example, an expression such as 'x[i,j]' will cause a warning, while
'x[(void)i,j]' will not.
This warning is enabled by '-Wall'.
'-Wunused'
All the above '-Wunused' options combined.
In order to get a warning about an unused function parameter, you
must either specify '-Wextra -Wunused' (note that '-Wall' implies
'-Wunused'), or separately specify '-Wunused-parameter'.
'-Wuninitialized'
Warn if an automatic variable is used without first being
initialized or if a variable may be clobbered by a 'setjmp' call.
These warnings are possible only in optimizing compilation, because
they require data flow information that is computed only when
optimizing. If you do not specify '-O', you will not get these
warnings. Instead, GCC will issue a warning about
'-Wuninitialized' requiring '-O'.
If you want to warn about code which uses the uninitialized value
of the variable in its own initializer, use the '-Winit-self'
option.
These warnings occur for individual uninitialized or clobbered
elements of structure, union or array variables as well as for
variables which are uninitialized or clobbered as a whole. They do
not occur for variables or elements declared 'volatile'. Because
these warnings depend on optimization, the exact variables or
elements for which there are warnings will depend on the precise
optimization options and version of GCC used.
Note that there may be no warning about a variable that is used
only to compute a value that itself is never used, because such
computations may be deleted by data flow analysis before the
warnings are printed.
These warnings are made optional because GCC is not smart enough to
see all the reasons why the code might be correct despite appearing
to have an error. Here is one example of how this can happen:
{
int x;
switch (y)
{
case 1: x = 1;
break;
case 2: x = 4;
break;
case 3: x = 5;
}
foo (x);
}
If the value of 'y' is always 1, 2 or 3, then 'x' is always
initialized, but GCC doesn't know this. Here is another common
case:
{
int save_y;
if (change_y) save_y = y, y = new_y;
...
if (change_y) y = save_y;
}
This has no bug because 'save_y' is used only if it is set.
This option also warns when a non-volatile automatic variable might
be changed by a call to 'longjmp'. These warnings as well are
possible only in optimizing compilation.
The compiler sees only the calls to 'setjmp'. It cannot know where
'longjmp' will be called; in fact, a signal handler could call it
at any point in the code. As a result, you may get a warning even
when there is in fact no problem because 'longjmp' cannot in fact
be called at the place which would cause a problem.
Some spurious warnings can be avoided if you declare all the
functions you use that never return as 'noreturn'. *Note Function
Attributes::.
This warning is enabled by '-Wall' or '-Wextra' in optimizing
compilations ('-O1' and above).
'-Wunknown-pragmas'
Warn when a #pragma directive is encountered which is not
understood by GCC. If this command line option is used, warnings
will even be issued for unknown pragmas in system header files.
This is not the case if the warnings were only enabled by the
'-Wall' command line option.
'-Wno-pragmas'
Do not warn about misuses of pragmas, such as incorrect parameters,
invalid syntax, or conflicts between pragmas. See also
'-Wunknown-pragmas'.
'-Wstrict-aliasing'
This option is only active when '-fstrict-aliasing' is active. It
warns about code which might break the strict aliasing rules that
the compiler is using for optimization. The warning does not catch
all cases, but does attempt to catch the more common pitfalls. It
is included in '-Wall'. It is equivalent to '-Wstrict-aliasing=3'
'-Wstrict-aliasing=n'
This option is only active when '-fstrict-aliasing' is active. It
warns about code which might break the strict aliasing rules that
the compiler is using for optimization. Higher levels correspond
to higher accuracy (fewer false positives). Higher levels also
correspond to more effort, similar to the way -O works.
'-Wstrict-aliasing' is equivalent to '-Wstrict-aliasing=n', with
n=3.
Level 1: Most aggressive, quick, least accurate. Possibly useful
when higher levels do not warn but -fstrict-aliasing still breaks
the code, as it has very few false negatives. However, it has many
false positives. Warns for all pointer conversions between
possibly incompatible types, even if never dereferenced. Runs in
the frontend only.
Level 2: Aggressive, quick, not too precise. May still have many
false positives (not as many as level 1 though), and few false
negatives (but possibly more than level 1). Unlike level 1, it
only warns when an address is taken. Warns about incomplete types.
Runs in the frontend only.
Level 3 (default for '-Wstrict-aliasing'): Should have very few
false positives and few false negatives. Slightly slower than
levels 1 or 2 when optimization is enabled. Takes care of the
common punn+dereference pattern in the frontend:
'*(int*)&some_float'. If optimization is enabled, it also runs in
the backend, where it deals with multiple statement cases using
flow-sensitive points-to information. Only warns when the
converted pointer is dereferenced. Does not warn about incomplete
types.
'-Wstrict-overflow'
'-Wstrict-overflow=N'
This option is only active when '-fstrict-overflow' is active. It
warns about cases where the compiler optimizes based on the
assumption that signed overflow does not occur. Note that it does
not warn about all cases where the code might overflow: it only
warns about cases where the compiler implements some optimization.
Thus this warning depends on the optimization level.
An optimization which assumes that signed overflow does not occur
is perfectly safe if the values of the variables involved are such
that overflow never does, in fact, occur. Therefore this warning
can easily give a false positive: a warning about code which is not
actually a problem. To help focus on important issues, several
warning levels are defined. No warnings are issued for the use of
undefined signed overflow when estimating how many iterations a
loop will require, in particular when determining whether a loop
will be executed at all.
'-Wstrict-overflow=1'
Warn about cases which are both questionable and easy to
avoid. For example: 'x + 1 > x'; with '-fstrict-overflow',
the compiler will simplify this to '1'. This level of
'-Wstrict-overflow' is enabled by '-Wall'; higher levels are
not, and must be explicitly requested.
'-Wstrict-overflow=2'
Also warn about other cases where a comparison is simplified
to a constant. For example: 'abs (x) >= 0'. This can only be
simplified when '-fstrict-overflow' is in effect, because 'abs
(INT_MIN)' overflows to 'INT_MIN', which is less than zero.
'-Wstrict-overflow' (with no level) is the same as
'-Wstrict-overflow=2'.
'-Wstrict-overflow=3'
Also warn about other cases where a comparison is simplified.
For example: 'x + 1 > 1' will be simplified to 'x > 0'.
'-Wstrict-overflow=4'
Also warn about other simplifications not covered by the above
cases. For example: '(x * 10) / 5' will be simplified to 'x *
2'.
'-Wstrict-overflow=5'
Also warn about cases where the compiler reduces the magnitude
of a constant involved in a comparison. For example: 'x + 2 >
y' will be simplified to 'x + 1 >= y'. This is reported only
at the highest warning level because this simplification
applies to many comparisons, so this warning level will give a
very large number of false positives.
'-Warray-bounds'
This option is only active when '-ftree-vrp' is active (default for
-O2 and above). It warns about subscripts to arrays that are
always out of bounds. This warning is enabled by '-Wall'.
'-Wno-div-by-zero'
Do not warn about compile-time integer division by zero. Floating
point division by zero is not warned about, as it can be a
legitimate way of obtaining infinities and NaNs.
'-Wsystem-headers'
Print warning messages for constructs found in system header files.
Warnings from system headers are normally suppressed, on the
assumption that they usually do not indicate real problems and
would only make the compiler output harder to read. Using this
command line option tells GCC to emit warnings from system headers
as if they occurred in user code. However, note that using '-Wall'
in conjunction with this option will _not_ warn about unknown
pragmas in system headers--for that, '-Wunknown-pragmas' must also
be used.
'-Wfloat-equal'
Warn if floating point values are used in equality comparisons.
The idea behind this is that sometimes it is convenient (for the
programmer) to consider floating-point values as approximations to
infinitely precise real numbers. If you are doing this, then you
need to compute (by analyzing the code, or in some other way) the
maximum or likely maximum error that the computation introduces,
and allow for it when performing comparisons (and when producing
output, but that's a different problem). In particular, instead of
testing for equality, you would check to see whether the two values
have ranges that overlap; and this is done with the relational
operators, so equality comparisons are probably mistaken.
'-Wtraditional (C and Objective-C only)'
Warn about certain constructs that behave differently in
traditional and ISO C. Also warn about ISO C constructs that have
no traditional C equivalent, and/or problematic constructs which
should be avoided.
* Macro parameters that appear within string literals in the
macro body. In traditional C macro replacement takes place
within string literals, but does not in ISO C.
* In traditional C, some preprocessor directives did not exist.
Traditional preprocessors would only consider a line to be a
directive if the '#' appeared in column 1 on the line.
Therefore '-Wtraditional' warns about directives that
traditional C understands but would ignore because the '#'
does not appear as the first character on the line. It also
suggests you hide directives like '#pragma' not understood by
traditional C by indenting them. Some traditional
implementations would not recognize '#elif', so it suggests
avoiding it altogether.
* A function-like macro that appears without arguments.
* The unary plus operator.
* The 'U' integer constant suffix, or the 'F' or 'L' floating
point constant suffixes. (Traditional C does support the 'L'
suffix on integer constants.) Note, these suffixes appear in
macros defined in the system headers of most modern systems,
e.g. the '_MIN'/'_MAX' macros in '<limits.h>'. Use of these
macros in user code might normally lead to spurious warnings,
however GCC's integrated preprocessor has enough context to
avoid warning in these cases.
* A function declared external in one block and then used after
the end of the block.
* A 'switch' statement has an operand of type 'long'.
* A non-'static' function declaration follows a 'static' one.
This construct is not accepted by some traditional C
compilers.
* The ISO type of an integer constant has a different width or
signedness from its traditional type. This warning is only
issued if the base of the constant is ten. I.e. hexadecimal
or octal values, which typically represent bit patterns, are
not warned about.
* Usage of ISO string concatenation is detected.
* Initialization of automatic aggregates.
* Identifier conflicts with labels. Traditional C lacks a
separate namespace for labels.
* Initialization of unions. If the initializer is zero, the
warning is omitted. This is done under the assumption that
the zero initializer in user code appears conditioned on e.g.
'__STDC__' to avoid missing initializer warnings and relies on
default initialization to zero in the traditional C case.
* Conversions by prototypes between fixed/floating point values
and vice versa. The absence of these prototypes when
compiling with traditional C would cause serious problems.
This is a subset of the possible conversion warnings, for the
full set use '-Wtraditional-conversion'.
* Use of ISO C style function definitions. This warning
intentionally is _not_ issued for prototype declarations or
variadic functions because these ISO C features will appear in
your code when using libiberty's traditional C compatibility
macros, 'PARAMS' and 'VPARAMS'. This warning is also bypassed
for nested functions because that feature is already a GCC
extension and thus not relevant to traditional C
compatibility.
'-Wtraditional-conversion (C and Objective-C only)'
Warn if a prototype causes a type conversion that is different from
what would happen to the same argument in the absence of a
prototype. This includes conversions of fixed point to floating
and vice versa, and conversions changing the width or signedness of
a fixed point argument except when the same as the default
promotion.
'-Wdeclaration-after-statement (C and Objective-C only)'
Warn when a declaration is found after a statement in a block.
This construct, known from C++, was introduced with ISO C99 and is
by default allowed in GCC. It is not supported by ISO C90 and was
not supported by GCC versions before GCC 3.0. *Note Mixed
Declarations::.
'-Wundef'
Warn if an undefined identifier is evaluated in an '#if' directive.
'-Wno-endif-labels'
Do not warn whenever an '#else' or an '#endif' are followed by
text.
'-Wshadow'
Warn whenever a local variable shadows another local variable,
parameter or global variable or whenever a built-in function is
shadowed.
'-Wlarger-than-LEN'
Warn whenever an object of larger than LEN bytes is defined.
'-Wunsafe-loop-optimizations'
Warn if the loop cannot be optimized because the compiler could not
assume anything on the bounds of the loop indices. With
'-funsafe-loop-optimizations' warn if the compiler made such
assumptions.
'-Wpointer-arith'
Warn about anything that depends on the "size of" a function type
or of 'void'. GNU C assigns these types a size of 1, for
convenience in calculations with 'void *' pointers and pointers to
functions. In C++, warn also when an arithmetic operation involves
'NULL'. This warning is also enabled by '-pedantic'.
'-Wtype-limits'
Warn if a comparison is always true or always false due to the
limited range of the data type, but do not warn for constant
expressions. For example, warn if an unsigned variable is compared
against zero with '<' or '>='. This warning is also enabled by
'-Wextra'.
'-Wbad-function-cast (C and Objective-C only)'
Warn whenever a function call is cast to a non-matching type. For
example, warn if 'int malloc()' is cast to 'anything *'.
'-Wc++-compat (C and Objective-C only)'
Warn about ISO C constructs that are outside of the common subset
of ISO C and ISO C++, e.g. request for implicit conversion from
'void *' to a pointer to non-'void' type.
'-Wc++0x-compat (C++ and Objective-C++ only)'
Warn about C++ constructs whose meaning differs between ISO C++
1998 and ISO C++ 200x, e.g., identifiers in ISO C++ 1998 that will
become keywords in ISO C++ 200x. This warning is enabled by
'-Wall'.
'-Wcast-qual'
Warn whenever a pointer is cast so as to remove a type qualifier
from the target type. For example, warn if a 'const char *' is
cast to an ordinary 'char *'.
'-Wcast-align'
Warn whenever a pointer is cast such that the required alignment of
the target is increased. For example, warn if a 'char *' is cast
to an 'int *' on machines where integers can only be accessed at
two- or four-byte boundaries.
'-Wwrite-strings'
When compiling C, give string constants the type 'const
char[LENGTH]' so that copying the address of one into a non-'const'
'char *' pointer will get a warning; when compiling C++, warn about
the deprecated conversion from string literals to 'char *'. This
warning, by default, is enabled for C++ programs. These warnings
will help you find at compile time code that can try to write into
a string constant, but only if you have been very careful about
using 'const' in declarations and prototypes. Otherwise, it will
just be a nuisance; this is why we did not make '-Wall' request
these warnings.
'-Wclobbered'
Warn for variables that might be changed by 'longjmp' or 'vfork'.
This warning is also enabled by '-Wextra'.
'-Wconversion'
Warn for implicit conversions that may alter a value. This
includes conversions between real and integer, like 'abs (x)' when
'x' is 'double'; conversions between signed and unsigned, like
'unsigned ui = -1'; and conversions to smaller types, like 'sqrtf
(M_PI)'. Do not warn for explicit casts like 'abs ((int) x)' and
'ui = (unsigned) -1', or if the value is not changed by the
conversion like in 'abs (2.0)'. Warnings about conversions between
signed and unsigned integers can be disabled by using
'-Wno-sign-conversion'.
For C++, also warn for conversions between 'NULL' and non-pointer
types; confusing overload resolution for user-defined conversions;
and conversions that will never use a type conversion operator:
conversions to 'void', the same type, a base class or a reference
to them. Warnings about conversions between signed and unsigned
integers are disabled by default in C++ unless '-Wsign-conversion'
is explicitly enabled.
'-Wempty-body'
Warn if an empty body occurs in an 'if', 'else' or 'do while'
statement. Additionally, in C++, warn when an empty body occurs in
a 'while' or 'for' statement with no whitespacing before the
semicolon. This warning is also enabled by '-Wextra'.
'-Wsign-compare'
Warn when a comparison between signed and unsigned values could
produce an incorrect result when the signed value is converted to
unsigned. This warning is also enabled by '-Wextra'; to get the
other warnings of '-Wextra' without this warning, use '-Wextra
-Wno-sign-compare'.
'-Wsign-conversion'
Warn for implicit conversions that may change the sign of an
integer value, like assigning a signed integer expression to an
unsigned integer variable. An explicit cast silences the warning.
In C, this option is enabled also by '-Wconversion'.
'-Waddress'
Warn about suspicious uses of memory addresses. These include
using the address of a function in a conditional expression, such
as 'void func(void); if (func)', and comparisons against the memory
address of a string literal, such as 'if (x == "abc")'. Such uses
typically indicate a programmer error: the address of a function
always evaluates to true, so their use in a conditional usually
indicate that the programmer forgot the parentheses in a function
call; and comparisons against string literals result in unspecified
behavior and are not portable in C, so they usually indicate that
the programmer intended to use 'strcmp'. This warning is enabled
by '-Wall'.
'-Wlogical-op'
Warn about suspicious uses of logical operators in expressions.
This includes using logical operators in contexts where a bit-wise
operator is likely to be expected.
'-Waggregate-return'
Warn if any functions that return structures or unions are defined
or called. (In languages where you can return an array, this also
elicits a warning.)
'-Wno-attributes'
Do not warn if an unexpected '__attribute__' is used, such as
unrecognized attributes, function attributes applied to variables,
etc. This will not stop errors for incorrect use of supported
attributes.
'-Wstrict-prototypes (C and Objective-C only)'
Warn if a function is declared or defined without specifying the
argument types. (An old-style function definition is permitted
without a warning if preceded by a declaration which specifies the
argument types.)
'-Wold-style-declaration (C and Objective-C only)'
Warn for obsolescent usages, according to the C Standard, in a
declaration. For example, warn if storage-class specifiers like
'static' are not the first things in a declaration. This warning
is also enabled by '-Wextra'.
'-Wold-style-definition (C and Objective-C only)'
Warn if an old-style function definition is used. A warning is
given even if there is a previous prototype.
'-Wmissing-parameter-type (C and Objective-C only)'
A function parameter is declared without a type specifier in
K&R-style functions:
void foo(bar) { }
This warning is also enabled by '-Wextra'.
'-Wmissing-prototypes (C and Objective-C only)'
Warn if a global function is defined without a previous prototype
declaration. This warning is issued even if the definition itself
provides a prototype. The aim is to detect global functions that
fail to be declared in header files.
'-Wmissing-declarations'
Warn if a global function is defined without a previous
declaration. Do so even if the definition itself provides a
prototype. Use this option to detect global functions that are not
declared in header files. In C++, no warnings are issued for
function templates, or for inline functions, or for functions in
anonymous namespaces.
'-Wmissing-field-initializers'
Warn if a structure's initializer has some fields missing. For
example, the following code would cause such a warning, because
'x.h' is implicitly zero:
struct s { int f, g, h; };
struct s x = { 3, 4 };
This option does not warn about designated initializers, so the
following modification would not trigger a warning:
struct s { int f, g, h; };
struct s x = { .f = 3, .g = 4 };
This warning is included in '-Wextra'. To get other '-Wextra'
warnings without this one, use '-Wextra
-Wno-missing-field-initializers'.
'-Wmissing-noreturn'
Warn about functions which might be candidates for attribute
'noreturn'. Note these are only possible candidates, not absolute
ones. Care should be taken to manually verify functions actually
do not ever return before adding the 'noreturn' attribute,
otherwise subtle code generation bugs could be introduced. You
will not get a warning for 'main' in hosted C environments.
'-Wmissing-format-attribute'
Warn about function pointers which might be candidates for 'format'
attributes. Note these are only possible candidates, not absolute
ones. GCC will guess that function pointers with 'format'
attributes that are used in assignment, initialization, parameter
passing or return statements should have a corresponding 'format'
attribute in the resulting type. I.e. the left-hand side of the
assignment or initialization, the type of the parameter variable,
or the return type of the containing function respectively should
also have a 'format' attribute to avoid the warning.
GCC will also warn about function definitions which might be
candidates for 'format' attributes. Again, these are only possible
candidates. GCC will guess that 'format' attributes might be
appropriate for any function that calls a function like 'vprintf'
or 'vscanf', but this might not always be the case, and some
functions for which 'format' attributes are appropriate may not be
detected.
'-Wno-multichar'
Do not warn if a multicharacter constant (''FOOF'') is used.
Usually they indicate a typo in the user's code, as they have
implementation-defined values, and should not be used in portable
code.
'-Wnormalized=<none|id|nfc|nfkc>'
In ISO C and ISO C++, two identifiers are different if they are
different sequences of characters. However, sometimes when
characters outside the basic ASCII character set are used, you can
have two different character sequences that look the same. To
avoid confusion, the ISO 10646 standard sets out some
"normalization rules" which when applied ensure that two sequences
that look the same are turned into the same sequence. GCC can warn
you if you are using identifiers which have not been normalized;
this option controls that warning.
There are four levels of warning that GCC supports. The default is
'-Wnormalized=nfc', which warns about any identifier which is not
in the ISO 10646 "C" normalized form, "NFC". NFC is the recommended
form for most uses.
Unfortunately, there are some characters which ISO C and ISO C++
allow in identifiers that when turned into NFC aren't allowable as
identifiers. That is, there's no way to use these symbols in
portable ISO C or C++ and have all your identifiers in NFC.
'-Wnormalized=id' suppresses the warning for these characters. It
is hoped that future versions of the standards involved will
correct this, which is why this option is not the default.
You can switch the warning off for all characters by writing
'-Wnormalized=none'. You would only want to do this if you were
using some other normalization scheme (like "D"), because otherwise
you can easily create bugs that are literally impossible to see.
Some characters in ISO 10646 have distinct meanings but look
identical in some fonts or display methodologies, especially once
formatting has been applied. For instance '\u207F', "SUPERSCRIPT
LATIN SMALL LETTER N", will display just like a regular 'n' which
has been placed in a superscript. ISO 10646 defines the "NFKC"
normalization scheme to convert all these into a standard form as
well, and GCC will warn if your code is not in NFKC if you use
'-Wnormalized=nfkc'. This warning is comparable to warning about
every identifier that contains the letter O because it might be
confused with the digit 0, and so is not the default, but may be
useful as a local coding convention if the programming environment
is unable to be fixed to display these characters distinctly.
'-Wno-deprecated-declarations'
Do not warn about uses of functions (*note Function Attributes::),
variables (*note Variable Attributes::), and types (*note Type
Attributes::) marked as deprecated by using the 'deprecated'
attribute.
'-Wno-overflow'
Do not warn about compile-time overflow in constant expressions.
'-Woverride-init (C and Objective-C only)'
Warn if an initialized field without side effects is overridden
when using designated initializers (*note Designated Initializers:
Designated Inits.).
This warning is included in '-Wextra'. To get other '-Wextra'
warnings without this one, use '-Wextra -Wno-override-init'.
'-Wpacked'
Warn if a structure is given the packed attribute, but the packed
attribute has no effect on the layout or size of the structure.
Such structures may be mis-aligned for little benefit. For
instance, in this code, the variable 'f.x' in 'struct bar' will be
misaligned even though 'struct bar' does not itself have the packed
attribute:
struct foo {
int x;
char a, b, c, d;
} __attribute__((packed));
struct bar {
char z;
struct foo f;
};
'-Wpadded'
Warn if padding is included in a structure, either to align an
element of the structure or to align the whole structure.
Sometimes when this happens it is possible to rearrange the fields
of the structure to reduce the padding and so make the structure
smaller.
'-Wredundant-decls'
Warn if anything is declared more than once in the same scope, even
in cases where multiple declaration is valid and changes nothing.
'-Wnested-externs (C and Objective-C only)'
Warn if an 'extern' declaration is encountered within a function.
'-Wunreachable-code'
Warn if the compiler detects that code will never be executed.
This option is intended to warn when the compiler detects that at
least a whole line of source code will never be executed, because
some condition is never satisfied or because it is after a
procedure that never returns.
It is possible for this option to produce a warning even though
there are circumstances under which part of the affected line can
be executed, so care should be taken when removing
apparently-unreachable code.
For instance, when a function is inlined, a warning may mean that
the line is unreachable in only one inlined copy of the function.
This option is not made part of '-Wall' because in a debugging
version of a program there is often substantial code which checks
correct functioning of the program and is, hopefully, unreachable
because the program does work. Another common use of unreachable
code is to provide behavior which is selectable at compile-time.
'-Winline'
Warn if a function can not be inlined and it was declared as
inline. Even with this option, the compiler will not warn about
failures to inline functions declared in system headers.
The compiler uses a variety of heuristics to determine whether or
not to inline a function. For example, the compiler takes into
account the size of the function being inlined and the amount of
inlining that has already been done in the current function.
Therefore, seemingly insignificant changes in the source program
can cause the warnings produced by '-Winline' to appear or
disappear.
'-Wno-invalid-offsetof (C++ and Objective-C++ only)'
Suppress warnings from applying the 'offsetof' macro to a non-POD
type. According to the 1998 ISO C++ standard, applying 'offsetof'
to a non-POD type is undefined. In existing C++ implementations,
however, 'offsetof' typically gives meaningful results even when
applied to certain kinds of non-POD types. (Such as a simple
'struct' that fails to be a POD type only by virtue of having a
constructor.) This flag is for users who are aware that they are
writing nonportable code and who have deliberately chosen to ignore
the warning about it.
The restrictions on 'offsetof' may be relaxed in a future version
of the C++ standard.
'-Wno-int-to-pointer-cast (C and Objective-C only)'
Suppress warnings from casts to pointer type of an integer of a
different size.
'-Wno-pointer-to-int-cast (C and Objective-C only)'
Suppress warnings from casts from a pointer to an integer type of a
different size.
'-Winvalid-pch'
Warn if a precompiled header (*note Precompiled Headers::) is found
in the search path but can't be used.
'-Wlong-long'
Warn if 'long long' type is used. This is default. To inhibit the
warning messages, use '-Wno-long-long'. Flags '-Wlong-long' and
'-Wno-long-long' are taken into account only when '-pedantic' flag
is used.
'-Wvariadic-macros'
Warn if variadic macros are used in pedantic ISO C90 mode, or the
GNU alternate syntax when in pedantic ISO C99 mode. This is
default. To inhibit the warning messages, use
'-Wno-variadic-macros'.
'-Wvla'
Warn if variable length array is used in the code. '-Wno-vla' will
prevent the '-pedantic' warning of the variable length array.
'-Wvolatile-register-var'
Warn if a register variable is declared volatile. The volatile
modifier does not inhibit all optimizations that may eliminate
reads and/or writes to register variables.
'-Wdisabled-optimization'
Warn if a requested optimization pass is disabled. This warning
does not generally indicate that there is anything wrong with your
code; it merely indicates that GCC's optimizers were unable to
handle the code effectively. Often, the problem is that your code
is too big or too complex; GCC will refuse to optimize programs
when the optimization itself is likely to take inordinate amounts
of time.
'-Wpointer-sign (C and Objective-C only)'
Warn for pointer argument passing or assignment with different
signedness. This option is only supported for C and Objective-C.
It is implied by '-Wall' and by '-pedantic', which can be disabled
with '-Wno-pointer-sign'.
'-Wstack-protector'
This option is only active when '-fstack-protector' is active. It
warns about functions that will not be protected against stack
smashing.
'-Woverlength-strings'
Warn about string constants which are longer than the "minimum
maximum" length specified in the C standard. Modern compilers
generally allow string constants which are much longer than the
standard's minimum limit, but very portable programs should avoid
using longer strings.
The limit applies _after_ string constant concatenation, and does
not count the trailing NUL. In C89, the limit was 509 characters;
in C99, it was raised to 4095. C++98 does not specify a normative
minimum maximum, so we do not diagnose overlength strings in C++.
This option is implied by '-pedantic', and can be disabled with
'-Wno-overlength-strings'.

File: gcc.info, Node: Debugging Options, Next: Optimize Options, Prev: Warning Options, Up: Invoking GCC
3.9 Options for Debugging Your Program or GCC
=============================================
GCC has various special options that are used for debugging either your
program or GCC:
'-g'
Produce debugging information in the operating system's native
format (stabs, COFF, XCOFF, or DWARF 2). GDB can work with this
debugging information.
On most systems that use stabs format, '-g' enables use of extra
debugging information that only GDB can use; this extra information
makes debugging work better in GDB but will probably make other
debuggers crash or refuse to read the program. If you want to
control for certain whether to generate the extra information, use
'-gstabs+', '-gstabs', '-gxcoff+', '-gxcoff', or '-gvms' (see
below).
GCC allows you to use '-g' with '-O'. The shortcuts taken by
optimized code may occasionally produce surprising results: some
variables you declared may not exist at all; flow of control may
briefly move where you did not expect it; some statements may not
be executed because they compute constant results or their values
were already at hand; some statements may execute in different
places because they were moved out of loops.
Nevertheless it proves possible to debug optimized output. This
makes it reasonable to use the optimizer for programs that might
have bugs.
The following options are useful when GCC is generated with the
capability for more than one debugging format.
'-ggdb'
Produce debugging information for use by GDB. This means to use
the most expressive format available (DWARF 2, stabs, or the native
format if neither of those are supported), including GDB extensions
if at all possible.
'-gstabs'
Produce debugging information in stabs format (if that is
supported), without GDB extensions. This is the format used by DBX
on most BSD systems. On MIPS, Alpha and System V Release 4 systems
this option produces stabs debugging output which is not understood
by DBX or SDB. On System V Release 4 systems this option requires
the GNU assembler.
'-feliminate-unused-debug-symbols'
Produce debugging information in stabs format (if that is
supported), for only symbols that are actually used.
'-femit-class-debug-always'
Instead of emitting debugging information for a C++ class in only
one object file, emit it in all object files using the class. This
option should be used only with debuggers that are unable to handle
the way GCC normally emits debugging information for classes
because using this option will increase the size of debugging
information by as much as a factor of two.
'-gstabs+'
Produce debugging information in stabs format (if that is
supported), using GNU extensions understood only by the GNU
debugger (GDB). The use of these extensions is likely to make
other debuggers crash or refuse to read the program.
'-gcoff'
Produce debugging information in COFF format (if that is
supported). This is the format used by SDB on most System V
systems prior to System V Release 4.
'-gxcoff'
Produce debugging information in XCOFF format (if that is
supported). This is the format used by the DBX debugger on IBM
RS/6000 systems.
'-gxcoff+'
Produce debugging information in XCOFF format (if that is
supported), using GNU extensions understood only by the GNU
debugger (GDB). The use of these extensions is likely to make
other debuggers crash or refuse to read the program, and may cause
assemblers other than the GNU assembler (GAS) to fail with an
error.
'-gdwarf-2'
Produce debugging information in DWARF version 2 format (if that is
supported). This is the format used by DBX on IRIX 6. With this
option, GCC uses features of DWARF version 3 when they are useful;
version 3 is upward compatible with version 2, but may still cause
problems for older debuggers.
'-gvms'
Produce debugging information in VMS debug format (if that is
supported). This is the format used by DEBUG on VMS systems.
'-gLEVEL'
'-ggdbLEVEL'
'-gstabsLEVEL'
'-gcoffLEVEL'
'-gxcoffLEVEL'
'-gvmsLEVEL'
Request debugging information and also use LEVEL to specify how
much information. The default level is 2.
Level 0 produces no debug information at all. Thus, '-g0' negates
'-g'.
Level 1 produces minimal information, enough for making backtraces
in parts of the program that you don't plan to debug. This
includes descriptions of functions and external variables, but no
information about local variables and no line numbers.
Level 3 includes extra information, such as all the macro
definitions present in the program. Some debuggers support macro
expansion when you use '-g3'.
'-gdwarf-2' does not accept a concatenated debug level, because GCC
used to support an option '-gdwarf' that meant to generate debug
information in version 1 of the DWARF format (which is very
different from version 2), and it would have been too confusing.
That debug format is long obsolete, but the option cannot be
changed now. Instead use an additional '-gLEVEL' option to change
the debug level for DWARF2.
'-feliminate-dwarf2-dups'
Compress DWARF2 debugging information by eliminating duplicated
information about each symbol. This option only makes sense when
generating DWARF2 debugging information with '-gdwarf-2'.
'-femit-struct-debug-baseonly'
Emit debug information for struct-like types only when the base
name of the compilation source file matches the base name of file
in which the struct was defined.
This option substantially reduces the size of debugging
information, but at significant potential loss in type information
to the debugger. See '-femit-struct-debug-reduced' for a less
aggressive option. See '-femit-struct-debug-detailed' for more
detailed control.
This option works only with DWARF 2.
'-femit-struct-debug-reduced'
Emit debug information for struct-like types only when the base
name of the compilation source file matches the base name of file
in which the type was defined, unless the struct is a template or
defined in a system header.
This option significantly reduces the size of debugging
information, with some potential loss in type information to the
debugger. See '-femit-struct-debug-baseonly' for a more aggressive
option. See '-femit-struct-debug-detailed' for more detailed
control.
This option works only with DWARF 2.
'-femit-struct-debug-detailed[=SPEC-LIST]'
Specify the struct-like types for which the compiler will generate
debug information. The intent is to reduce duplicate struct debug
information between different object files within the same program.
This option is a detailed version of '-femit-struct-debug-reduced'
and '-femit-struct-debug-baseonly', which will serve for most
needs.
A specification has the syntax
['dir:'|'ind:']['ord:'|'gen:']('any'|'sys'|'base'|'none')
The optional first word limits the specification to structs that
are used directly ('dir:') or used indirectly ('ind:'). A struct
type is used directly when it is the type of a variable, member.
Indirect uses arise through pointers to structs. That is, when use
of an incomplete struct would be legal, the use is indirect. An
example is 'struct one direct; struct two * indirect;'.
The optional second word limits the specification to ordinary
structs ('ord:') or generic structs ('gen:'). Generic structs are
a bit complicated to explain. For C++, these are non-explicit
specializations of template classes, or non-template classes within
the above. Other programming languages have generics, but
'-femit-struct-debug-detailed' does not yet implement them.
The third word specifies the source files for those structs for
which the compiler will emit debug information. The values 'none'
and 'any' have the normal meaning. The value 'base' means that the
base of name of the file in which the type declaration appears must
match the base of the name of the main compilation file. In
practice, this means that types declared in 'foo.c' and 'foo.h'
will have debug information, but types declared in other header
will not. The value 'sys' means those types satisfying 'base' or
declared in system or compiler headers.
You may need to experiment to determine the best settings for your
application.
The default is '-femit-struct-debug-detailed=all'.
This option works only with DWARF 2.
'-fno-merge-debug-strings'
Direct the linker to merge together strings which are identical in
different object files. This is not supported by all assemblers or
linker. This decreases the size of the debug information in the
output file at the cost of increasing link processing time. This
is on by default.
'-fdebug-prefix-map=OLD=NEW'
When compiling files in directory 'OLD', record debugging
information describing them as in 'NEW' instead.
'-p'
Generate extra code to write profile information suitable for the
analysis program 'prof'. You must use this option when compiling
the source files you want data about, and you must also use it when
linking.
'-pg'
Generate extra code to write profile information suitable for the
analysis program 'gprof'. You must use this option when compiling
the source files you want data about, and you must also use it when
linking.
'-Q'
Makes the compiler print out each function name as it is compiled,
and print some statistics about each pass when it finishes.
'-ftime-report'
Makes the compiler print some statistics about the time consumed by
each pass when it finishes.
'-fmem-report'
Makes the compiler print some statistics about permanent memory
allocation when it finishes.
'-fpre-ipa-mem-report'
'-fpost-ipa-mem-report'
Makes the compiler print some statistics about permanent memory
allocation before or after interprocedural optimization.
'-fprofile-arcs'
Add code so that program flow "arcs" are instrumented. During
execution the program records how many times each branch and call
is executed and how many times it is taken or returns. When the
compiled program exits it saves this data to a file called
'AUXNAME.gcda' for each source file. The data may be used for
profile-directed optimizations ('-fbranch-probabilities'), or for
test coverage analysis ('-ftest-coverage'). Each object file's
AUXNAME is generated from the name of the output file, if
explicitly specified and it is not the final executable, otherwise
it is the basename of the source file. In both cases any suffix is
removed (e.g. 'foo.gcda' for input file 'dir/foo.c', or
'dir/foo.gcda' for output file specified as '-o dir/foo.o'). *Note
Cross-profiling::.
'--coverage'
This option is used to compile and link code instrumented for
coverage analysis. The option is a synonym for '-fprofile-arcs'
'-ftest-coverage' (when compiling) and '-lgcov' (when linking).
See the documentation for those options for more details.
* Compile the source files with '-fprofile-arcs' plus
optimization and code generation options. For test coverage
analysis, use the additional '-ftest-coverage' option. You do
not need to profile every source file in a program.
* Link your object files with '-lgcov' or '-fprofile-arcs' (the
latter implies the former).
* Run the program on a representative workload to generate the
arc profile information. This may be repeated any number of
times. You can run concurrent instances of your program, and
provided that the file system supports locking, the data files
will be correctly updated. Also 'fork' calls are detected and
correctly handled (double counting will not happen).
* For profile-directed optimizations, compile the source files
again with the same optimization and code generation options
plus '-fbranch-probabilities' (*note Options that Control
Optimization: Optimize Options.).
* For test coverage analysis, use 'gcov' to produce human
readable information from the '.gcno' and '.gcda' files.
Refer to the 'gcov' documentation for further information.
With '-fprofile-arcs', for each function of your program GCC
creates a program flow graph, then finds a spanning tree for the
graph. Only arcs that are not on the spanning tree have to be
instrumented: the compiler adds code to count the number of times
that these arcs are executed. When an arc is the only exit or only
entrance to a block, the instrumentation code can be added to the
block; otherwise, a new basic block must be created to hold the
instrumentation code.
'-ftest-coverage'
Produce a notes file that the 'gcov' code-coverage utility (*note
'gcov'--a Test Coverage Program: Gcov.) can use to show program
coverage. Each source file's note file is called 'AUXNAME.gcno'.
Refer to the '-fprofile-arcs' option above for a description of
AUXNAME and instructions on how to generate test coverage data.
Coverage data will match the source files more closely, if you do
not optimize.
'-fdbg-cnt-list'
Print the name and the counter upperbound for all debug counters.
'-fdbg-cnt=COUNTER-VALUE-LIST'
Set the internal debug counter upperbound. COUNTER-VALUE-LIST is a
comma-separated list of NAME:VALUE pairs which sets the upperbound
of each debug counter NAME to VALUE. All debug counters have the
initial upperbound of UINT_MAX, thus dbg_cnt() returns true always
unless the upperbound is set by this option. e.g. With
-fdbg-cnt=dce:10,tail_call:0 dbg_cnt(dce) will return true only for
first 10 invocations and dbg_cnt(tail_call) will return false
always.
'-dLETTERS'
'-fdump-rtl-PASS'
Says to make debugging dumps during compilation at times specified
by LETTERS. This is used for debugging the RTL-based passes of the
compiler. The file names for most of the dumps are made by
appending a pass number and a word to the DUMPNAME. DUMPNAME is
generated from the name of the output file, if explicitly specified
and it is not an executable, otherwise it is the basename of the
source file. These switches may have different effects when '-E'
is used for preprocessing.
Most debug dumps can be enabled either passing a letter to the '-d'
option, or with a long '-fdump-rtl' switch; here are the possible
letters for use in LETTERS and PASS, and their meanings:
'-dA'
Annotate the assembler output with miscellaneous debugging
information.
'-dB'
'-fdump-rtl-bbro'
Dump after block reordering, to 'FILE.148r.bbro'.
'-dc'
'-fdump-rtl-combine'
Dump after the RTL instruction combination pass, to the file
'FILE.129r.combine'.
'-dC'
'-fdump-rtl-ce1'
'-fdump-rtl-ce2'
'-dC' and '-fdump-rtl-ce1' enable dumping after the first if
conversion, to the file 'FILE.117r.ce1'. '-dC' and
'-fdump-rtl-ce2' enable dumping after the second if
conversion, to the file 'FILE.130r.ce2'.
'-dd'
'-fdump-rtl-btl'
'-fdump-rtl-dbr'
'-dd' and '-fdump-rtl-btl' enable dumping after branch target
load optimization, to 'FILE.31.btl'. '-dd' and
'-fdump-rtl-dbr' enable dumping after delayed branch
scheduling, to 'FILE.36.dbr'.
'-dD'
Dump all macro definitions, at the end of preprocessing, in
addition to normal output.
'-dE'
'-fdump-rtl-ce3'
Dump after the third if conversion, to 'FILE.146r.ce3'.
'-df'
'-fdump-rtl-cfg'
'-fdump-rtl-life'
'-df' and '-fdump-rtl-cfg' enable dumping after control and
data flow analysis, to 'FILE.116r.cfg'. '-df' and
'-fdump-rtl-cfg' enable dumping dump after life analysis, to
'FILE.128r.life1' and 'FILE.135r.life2'.
'-dg'
'-fdump-rtl-greg'
Dump after global register allocation, to 'FILE.139r.greg'.
'-dG'
'-fdump-rtl-gcse'
'-fdump-rtl-bypass'
'-dG' and '-fdump-rtl-gcse' enable dumping after GCSE, to
'FILE.114r.gcse'. '-dG' and '-fdump-rtl-bypass' enable
dumping after jump bypassing and control flow optimizations,
to 'FILE.115r.bypass'.
'-dh'
'-fdump-rtl-eh'
Dump after finalization of EH handling code, to 'FILE.02.eh'.
'-di'
'-fdump-rtl-sibling'
Dump after sibling call optimizations, to 'FILE.106r.sibling'.
'-dj'
'-fdump-rtl-jump'
Dump after the first jump optimization, to 'FILE.112r.jump'.
'-dk'
'-fdump-rtl-stack'
Dump after conversion from GCC's "flat register file"
registers to the x87's stack-like registers, to
'FILE.152r.stack'.
'-dl'
'-fdump-rtl-lreg'
Dump after local register allocation, to 'FILE.138r.lreg'.
'-dL'
'-fdump-rtl-loop2'
'-dL' and '-fdump-rtl-loop2' enable dumping after the loop
optimization pass, to 'FILE.119r.loop2',
'FILE.120r.loop2_init', 'FILE.121r.loop2_invariant', and
'FILE.125r.loop2_done'.
'-dm'
'-fdump-rtl-sms'
Dump after modulo scheduling, to 'FILE.136r.sms'.
'-dM'
'-fdump-rtl-mach'
Dump after performing the machine dependent reorganization
pass, to 'FILE.155r.mach' if that pass exists.
'-dn'
'-fdump-rtl-rnreg'
Dump after register renumbering, to 'FILE.147r.rnreg'.
'-dN'
'-fdump-rtl-regmove'
Dump after the register move pass, to 'FILE.132r.regmove'.
'-do'
'-fdump-rtl-postreload'
Dump after post-reload optimizations, to 'FILE.24.postreload'.
'-dr'
'-fdump-rtl-expand'
Dump after RTL generation, to 'FILE.104r.expand'.
'-dR'
'-fdump-rtl-sched2'
Dump after the second scheduling pass, to 'FILE.149r.sched2'.
'-ds'
'-fdump-rtl-cse'
Dump after CSE (including the jump optimization that sometimes
follows CSE), to 'FILE.113r.cse'.
'-dS'
'-fdump-rtl-sched1'
Dump after the first scheduling pass, to 'FILE.136r.sched1'.
'-dt'
'-fdump-rtl-cse2'
Dump after the second CSE pass (including the jump
optimization that sometimes follows CSE), to 'FILE.127r.cse2'.
'-dT'
'-fdump-rtl-tracer'
Dump after running tracer, to 'FILE.118r.tracer'.
'-dV'
'-fdump-rtl-vpt'
'-fdump-rtl-vartrack'
'-dV' and '-fdump-rtl-vpt' enable dumping after the value
profile transformations, to 'FILE.10.vpt'. '-dV' and
'-fdump-rtl-vartrack' enable dumping after variable tracking,
to 'FILE.154r.vartrack'.
'-dw'
'-fdump-rtl-flow2'
Dump after the second flow pass, to 'FILE.142r.flow2'.
'-dz'
'-fdump-rtl-peephole2'
Dump after the peephole pass, to 'FILE.145r.peephole2'.
'-dZ'
'-fdump-rtl-web'
Dump after live range splitting, to 'FILE.126r.web'.
'-da'
'-fdump-rtl-all'
Produce all the dumps listed above.
'-dH'
Produce a core dump whenever an error occurs.
'-dm'
Print statistics on memory usage, at the end of the run, to
standard error.
'-dp'
Annotate the assembler output with a comment indicating which
pattern and alternative was used. The length of each
instruction is also printed.
'-dP'
Dump the RTL in the assembler output as a comment before each
instruction. Also turns on '-dp' annotation.
'-dv'
For each of the other indicated dump files (either with '-d'
or '-fdump-rtl-PASS'), dump a representation of the control
flow graph suitable for viewing with VCG to 'FILE.PASS.vcg'.
'-dx'
Just generate RTL for a function instead of compiling it.
Usually used with 'r' ('-fdump-rtl-expand').
'-dy'
Dump debugging information during parsing, to standard error.
'-fdump-noaddr'
When doing debugging dumps (see '-d' option above), suppress
address output. This makes it more feasible to use diff on
debugging dumps for compiler invocations with different compiler
binaries and/or different text / bss / data / heap / stack / dso
start locations.
'-fdump-unnumbered'
When doing debugging dumps (see '-d' option above), suppress
instruction numbers and address output. This makes it more
feasible to use diff on debugging dumps for compiler invocations
with different options, in particular with and without '-g'.
'-fdump-translation-unit (C++ only)'
'-fdump-translation-unit-OPTIONS (C++ only)'
Dump a representation of the tree structure for the entire
translation unit to a file. The file name is made by appending
'.tu' to the source file name. If the '-OPTIONS' form is used,
OPTIONS controls the details of the dump as described for the
'-fdump-tree' options.
'-fdump-class-hierarchy (C++ only)'
'-fdump-class-hierarchy-OPTIONS (C++ only)'
Dump a representation of each class's hierarchy and virtual
function table layout to a file. The file name is made by
appending '.class' to the source file name. If the '-OPTIONS' form
is used, OPTIONS controls the details of the dump as described for
the '-fdump-tree' options.
'-fdump-ipa-SWITCH'
Control the dumping at various stages of inter-procedural analysis
language tree to a file. The file name is generated by appending a
switch specific suffix to the source file name. The following
dumps are possible:
'all'
Enables all inter-procedural analysis dumps.
'cgraph'
Dumps information about call-graph optimization, unused
function removal, and inlining decisions.
'inline'
Dump after function inlining.
'-fdump-tree-SWITCH'
'-fdump-tree-SWITCH-OPTIONS'
Control the dumping at various stages of processing the
intermediate language tree to a file. The file name is generated
by appending a switch specific suffix to the source file name. If
the '-OPTIONS' form is used, OPTIONS is a list of '-' separated
options that control the details of the dump. Not all options are
applicable to all dumps, those which are not meaningful will be
ignored. The following options are available
'address'
Print the address of each node. Usually this is not
meaningful as it changes according to the environment and
source file. Its primary use is for tying up a dump file with
a debug environment.
'slim'
Inhibit dumping of members of a scope or body of a function
merely because that scope has been reached. Only dump such
items when they are directly reachable by some other path.
When dumping pretty-printed trees, this option inhibits
dumping the bodies of control structures.
'raw'
Print a raw representation of the tree. By default, trees are
pretty-printed into a C-like representation.
'details'
Enable more detailed dumps (not honored by every dump option).
'stats'
Enable dumping various statistics about the pass (not honored
by every dump option).
'blocks'
Enable showing basic block boundaries (disabled in raw dumps).
'vops'
Enable showing virtual operands for every statement.
'lineno'
Enable showing line numbers for statements.
'uid'
Enable showing the unique ID ('DECL_UID') for each variable.
'all'
Turn on all options, except 'raw', 'slim' and 'lineno'.
The following tree dumps are possible:
'original'
Dump before any tree based optimization, to 'FILE.original'.
'optimized'
Dump after all tree based optimization, to 'FILE.optimized'.
'gimple'
Dump each function before and after the gimplification pass to
a file. The file name is made by appending '.gimple' to the
source file name.
'cfg'
Dump the control flow graph of each function to a file. The
file name is made by appending '.cfg' to the source file name.
'vcg'
Dump the control flow graph of each function to a file in VCG
format. The file name is made by appending '.vcg' to the
source file name. Note that if the file contains more than
one function, the generated file cannot be used directly by
VCG. You will need to cut and paste each function's graph
into its own separate file first.
'ch'
Dump each function after copying loop headers. The file name
is made by appending '.ch' to the source file name.
'ssa'
Dump SSA related information to a file. The file name is made
by appending '.ssa' to the source file name.
'salias'
Dump structure aliasing variable information to a file. This
file name is made by appending '.salias' to the source file
name.
'alias'
Dump aliasing information for each function. The file name is
made by appending '.alias' to the source file name.
'ccp'
Dump each function after CCP. The file name is made by
appending '.ccp' to the source file name.
'storeccp'
Dump each function after STORE-CCP. The file name is made by
appending '.storeccp' to the source file name.
'pre'
Dump trees after partial redundancy elimination. The file
name is made by appending '.pre' to the source file name.
'fre'
Dump trees after full redundancy elimination. The file name
is made by appending '.fre' to the source file name.
'copyprop'
Dump trees after copy propagation. The file name is made by
appending '.copyprop' to the source file name.
'store_copyprop'
Dump trees after store copy-propagation. The file name is
made by appending '.store_copyprop' to the source file name.
'dce'
Dump each function after dead code elimination. The file name
is made by appending '.dce' to the source file name.
'mudflap'
Dump each function after adding mudflap instrumentation. The
file name is made by appending '.mudflap' to the source file
name.
'sra'
Dump each function after performing scalar replacement of
aggregates. The file name is made by appending '.sra' to the
source file name.
'sink'
Dump each function after performing code sinking. The file
name is made by appending '.sink' to the source file name.
'dom'
Dump each function after applying dominator tree
optimizations. The file name is made by appending '.dom' to
the source file name.
'dse'
Dump each function after applying dead store elimination. The
file name is made by appending '.dse' to the source file name.
'phiopt'
Dump each function after optimizing PHI nodes into
straightline code. The file name is made by appending
'.phiopt' to the source file name.
'forwprop'
Dump each function after forward propagating single use
variables. The file name is made by appending '.forwprop' to
the source file name.
'copyrename'
Dump each function after applying the copy rename
optimization. The file name is made by appending
'.copyrename' to the source file name.
'nrv'
Dump each function after applying the named return value
optimization on generic trees. The file name is made by
appending '.nrv' to the source file name.
'vect'
Dump each function after applying vectorization of loops. The
file name is made by appending '.vect' to the source file
name.
'vrp'
Dump each function after Value Range Propagation (VRP). The
file name is made by appending '.vrp' to the source file name.
'all'
Enable all the available tree dumps with the flags provided in
this option.
'-ftree-vectorizer-verbose=N'
This option controls the amount of debugging output the vectorizer
prints. This information is written to standard error, unless
'-fdump-tree-all' or '-fdump-tree-vect' is specified, in which case
it is output to the usual dump listing file, '.vect'. For N=0 no
diagnostic information is reported. If N=1 the vectorizer reports
each loop that got vectorized, and the total number of loops that
got vectorized. If N=2 the vectorizer also reports non-vectorized
loops that passed the first analysis phase (vect_analyze_loop_form)
- i.e. countable, inner-most, single-bb, single-entry/exit loops.
This is the same verbosity level that '-fdump-tree-vect-stats'
uses. Higher verbosity levels mean either more information dumped
for each reported loop, or same amount of information reported for
more loops: If N=3, alignment related information is added to the
reports. If N=4, data-references related information (e.g. memory
dependences, memory access-patterns) is added to the reports. If
N=5, the vectorizer reports also non-vectorized inner-most loops
that did not pass the first analysis phase (i.e., may not be
countable, or may have complicated control-flow). If N=6, the
vectorizer reports also non-vectorized nested loops. For N=7, all
the information the vectorizer generates during its analysis and
transformation is reported. This is the same verbosity level that
'-fdump-tree-vect-details' uses.
'-frandom-seed=STRING'
This option provides a seed that GCC uses when it would otherwise
use random numbers. It is used to generate certain symbol names
that have to be different in every compiled file. It is also used
to place unique stamps in coverage data files and the object files
that produce them. You can use the '-frandom-seed' option to
produce reproducibly identical object files.
The STRING should be different for every file you compile.
'-fsched-verbose=N'
On targets that use instruction scheduling, this option controls
the amount of debugging output the scheduler prints. This
information is written to standard error, unless '-dS' or '-dR' is
specified, in which case it is output to the usual dump listing
file, '.sched' or '.sched2' respectively. However for N greater
than nine, the output is always printed to standard error.
For N greater than zero, '-fsched-verbose' outputs the same
information as '-dRS'. For N greater than one, it also output
basic block probabilities, detailed ready list information and
unit/insn info. For N greater than two, it includes RTL at abort
point, control-flow and regions info. And for N over four,
'-fsched-verbose' also includes dependence info.
'-save-temps'
Store the usual "temporary" intermediate files permanently; place
them in the current directory and name them based on the source
file. Thus, compiling 'foo.c' with '-c -save-temps' would produce
files 'foo.i' and 'foo.s', as well as 'foo.o'. This creates a
preprocessed 'foo.i' output file even though the compiler now
normally uses an integrated preprocessor.
When used in combination with the '-x' command line option,
'-save-temps' is sensible enough to avoid over writing an input
source file with the same extension as an intermediate file. The
corresponding intermediate file may be obtained by renaming the
source file before using '-save-temps'.
'-time'
Report the CPU time taken by each subprocess in the compilation
sequence. For C source files, this is the compiler proper and
assembler (plus the linker if linking is done). The output looks
like this:
# cc1 0.12 0.01
# as 0.00 0.01
The first number on each line is the "user time", that is time
spent executing the program itself. The second number is "system
time", time spent executing operating system routines on behalf of
the program. Both numbers are in seconds.
'-fvar-tracking'
Run variable tracking pass. It computes where variables are stored
at each position in code. Better debugging information is then
generated (if the debugging information format supports this
information).
It is enabled by default when compiling with optimization ('-Os',
'-O', '-O2', ...), debugging information ('-g') and the debug info
format supports it.
'-print-file-name=LIBRARY'
Print the full absolute name of the library file LIBRARY that would
be used when linking--and don't do anything else. With this
option, GCC does not compile or link anything; it just prints the
file name.
'-print-multi-directory'
Print the directory name corresponding to the multilib selected by
any other switches present in the command line. This directory is
supposed to exist in 'GCC_EXEC_PREFIX'.
'-print-multi-lib'
Print the mapping from multilib directory names to compiler
switches that enable them. The directory name is separated from
the switches by ';', and each switch starts with an '@' instead of
the '-', without spaces between multiple switches. This is
supposed to ease shell-processing.
'-print-prog-name=PROGRAM'
Like '-print-file-name', but searches for a program such as 'cpp'.
'-print-libgcc-file-name'
Same as '-print-file-name=libgcc.a'.
This is useful when you use '-nostdlib' or '-nodefaultlibs' but you
do want to link with 'libgcc.a'. You can do
gcc -nostdlib FILES... `gcc -print-libgcc-file-name`
'-print-search-dirs'
Print the name of the configured installation directory and a list
of program and library directories 'gcc' will search--and don't do
anything else.
This is useful when 'gcc' prints the error message 'installation
problem, cannot exec cpp0: No such file or directory'. To resolve
this you either need to put 'cpp0' and the other compiler
components where 'gcc' expects to find them, or you can set the
environment variable 'GCC_EXEC_PREFIX' to the directory where you
installed them. Don't forget the trailing '/'. *Note Environment
Variables::.
'-print-sysroot-headers-suffix'
Print the suffix added to the target sysroot when searching for
headers, or give an error if the compiler is not configured with
such a suffix--and don't do anything else.
'-dumpmachine'
Print the compiler's target machine (for example,
'i686-pc-linux-gnu')--and don't do anything else.
'-dumpversion'
Print the compiler version (for example, '3.0')--and don't do
anything else.
'-dumpspecs'
Print the compiler's built-in specs--and don't do anything else.
(This is used when GCC itself is being built.) *Note Spec Files::.
'-feliminate-unused-debug-types'
Normally, when producing DWARF2 output, GCC will emit debugging
information for all types declared in a compilation unit,
regardless of whether or not they are actually used in that
compilation unit. Sometimes this is useful, such as if, in the
debugger, you want to cast a value to a type that is not actually
used in your program (but is declared). More often, however, this
results in a significant amount of wasted space. With this option,
GCC will avoid producing debug symbol output for types that are
nowhere used in the source file being compiled.

File: gcc.info, Node: Optimize Options, Next: Preprocessor Options, Prev: Debugging Options, Up: Invoking GCC
3.10 Options That Control Optimization
======================================
These options control various sorts of optimizations.
Without any optimization option, the compiler's goal is to reduce the
cost of compilation and to make debugging produce the expected results.
Statements are independent: if you stop the program with a breakpoint
between statements, you can then assign a new value to any variable or
change the program counter to any other statement in the function and
get exactly the results you would expect from the source code.
Turning on optimization flags makes the compiler attempt to improve the
performance and/or code size at the expense of compilation time and
possibly the ability to debug the program.
The compiler performs optimization based on the knowledge it has of the
program. Optimization levels '-O' and above, in particular, enable
_unit-at-a-time_ mode, which allows the compiler to consider information
gained from later functions in the file when compiling a function.
Compiling multiple files at once to a single output file in
_unit-at-a-time_ mode allows the compiler to use information gained from
all of the files when compiling each of them.
Not all optimizations are controlled directly by a flag. Only
optimizations that have a flag are listed.
'-O'
'-O1'
Optimize. Optimizing compilation takes somewhat more time, and a
lot more memory for a large function.
With '-O', the compiler tries to reduce code size and execution
time, without performing any optimizations that take a great deal
of compilation time.
'-O' turns on the following optimization flags:
-fauto-inc-dec
-fcprop-registers
-fdce
-fdefer-pop
-fdelayed-branch
-fdse
-fguess-branch-probability
-fif-conversion2
-fif-conversion
-finline-small-functions
-fipa-pure-const
-fipa-reference
-fmerge-constants
-fsplit-wide-types
-ftree-ccp
-ftree-ch
-ftree-copyrename
-ftree-dce
-ftree-dominator-opts
-ftree-dse
-ftree-fre
-ftree-sra
-ftree-ter
-funit-at-a-time
'-O' also turns on '-fomit-frame-pointer' on machines where doing
so does not interfere with debugging.
'-O2'
Optimize even more. GCC performs nearly all supported
optimizations that do not involve a space-speed tradeoff. The
compiler does not perform loop unrolling or function inlining when
you specify '-O2'. As compared to '-O', this option increases both
compilation time and the performance of the generated code.
'-O2' turns on all optimization flags specified by '-O'. It also
turns on the following optimization flags:
-fthread-jumps
-falign-functions -falign-jumps
-falign-loops -falign-labels
-fcaller-saves
-fcrossjumping
-fcse-follow-jumps -fcse-skip-blocks
-fdelete-null-pointer-checks
-fexpensive-optimizations
-fgcse -fgcse-lm
-foptimize-sibling-calls
-fpeephole2
-fregmove
-freorder-blocks -freorder-functions
-frerun-cse-after-loop
-fsched-interblock -fsched-spec
-fschedule-insns -fschedule-insns2
-fstrict-aliasing -fstrict-overflow
-ftree-pre
-ftree-vrp
Please note the warning under '-fgcse' about invoking '-O2' on
programs that use computed gotos.
'-O3'
Optimize yet more. '-O3' turns on all optimizations specified by
'-O2' and also turns on the '-finline-functions',
'-funswitch-loops', '-fpredictive-commoning', '-fgcse-after-reload'
and '-ftree-vectorize' options.
'-O0'
Reduce compilation time and make debugging produce the expected
results. This is the default.
'-Os'
Optimize for size. '-Os' enables all '-O2' optimizations that do
not typically increase code size. It also performs further
optimizations designed to reduce code size.
'-Os' disables the following optimization flags:
-falign-functions -falign-jumps -falign-loops
-falign-labels -freorder-blocks -freorder-blocks-and-partition
-fprefetch-loop-arrays -ftree-vect-loop-version
If you use multiple '-O' options, with or without level numbers,
the last such option is the one that is effective.
Options of the form '-fFLAG' specify machine-independent flags. Most
flags have both positive and negative forms; the negative form of
'-ffoo' would be '-fno-foo'. In the table below, only one of the forms
is listed--the one you typically will use. You can figure out the other
form by either removing 'no-' or adding it.
The following options control specific optimizations. They are either
activated by '-O' options or are related to ones that are. You can use
the following flags in the rare cases when "fine-tuning" of
optimizations to be performed is desired.
'-fno-default-inline'
Do not make member functions inline by default merely because they
are defined inside the class scope (C++ only). Otherwise, when you
specify '-O', member functions defined inside class scope are
compiled inline by default; i.e., you don't need to add 'inline' in
front of the member function name.
'-fno-defer-pop'
Always pop the arguments to each function call as soon as that
function returns. For machines which must pop arguments after a
function call, the compiler normally lets arguments accumulate on
the stack for several function calls and pops them all at once.
Disabled at levels '-O', '-O2', '-O3', '-Os'.
'-fforward-propagate'
Perform a forward propagation pass on RTL. The pass tries to
combine two instructions and checks if the result can be
simplified. If loop unrolling is active, two passes are performed
and the second is scheduled after loop unrolling.
This option is enabled by default at optimization levels '-O2',
'-O3', '-Os'.
'-fomit-frame-pointer'
Don't keep the frame pointer in a register for functions that don't
need one. This avoids the instructions to save, set up and restore
frame pointers; it also makes an extra register available in many
functions. *It also makes debugging impossible on some machines.*
On some machines, such as the VAX, this flag has no effect, because
the standard calling sequence automatically handles the frame
pointer and nothing is saved by pretending it doesn't exist. The
machine-description macro 'FRAME_POINTER_REQUIRED' controls whether
a target machine supports this flag. *Note Register Usage:
(gccint)Registers.
Enabled at levels '-O', '-O2', '-O3', '-Os'.
'-foptimize-sibling-calls'
Optimize sibling and tail recursive calls.
Enabled at levels '-O2', '-O3', '-Os'.
'-fno-inline'
Don't pay attention to the 'inline' keyword. Normally this option
is used to keep the compiler from expanding any functions inline.
Note that if you are not optimizing, no functions can be expanded
inline.
'-finline-small-functions'
Integrate functions into their callers when their body is smaller
than expected function call code (so overall size of program gets
smaller). The compiler heuristically decides which functions are
simple enough to be worth integrating in this way.
Enabled at level '-O2'.
'-finline-functions'
Integrate all simple functions into their callers. The compiler
heuristically decides which functions are simple enough to be worth
integrating in this way.
If all calls to a given function are integrated, and the function
is declared 'static', then the function is normally not output as
assembler code in its own right.
Enabled at level '-O3'.
'-finline-functions-called-once'
Consider all 'static' functions called once for inlining into their
caller even if they are not marked 'inline'. If a call to a given
function is integrated, then the function is not output as
assembler code in its own right.
Enabled if '-funit-at-a-time' is enabled.
'-fearly-inlining'
Inline functions marked by 'always_inline' and functions whose body
seems smaller than the function call overhead early before doing
'-fprofile-generate' instrumentation and real inlining pass. Doing
so makes profiling significantly cheaper and usually inlining
faster on programs having large chains of nested wrapper functions.
Enabled by default.
'-finline-limit=N'
By default, GCC limits the size of functions that can be inlined.
This flag allows coarse control of this limit. N is the size of
functions that can be inlined in number of pseudo instructions.
Inlining is actually controlled by a number of parameters, which
may be specified individually by using '--param NAME=VALUE'. The
'-finline-limit=N' option sets some of these parameters as follows:
'max-inline-insns-single'
is set to N/2.
'max-inline-insns-auto'
is set to N/2.
See below for a documentation of the individual parameters
controlling inlining and for the defaults of these parameters.
_Note:_ there may be no value to '-finline-limit' that results in
default behavior.
_Note:_ pseudo instruction represents, in this particular context,
an abstract measurement of function's size. In no way does it
represent a count of assembly instructions and as such its exact
meaning might change from one release to an another.
'-fkeep-inline-functions'
In C, emit 'static' functions that are declared 'inline' into the
object file, even if the function has been inlined into all of its
callers. This switch does not affect functions using the 'extern
inline' extension in GNU C89. In C++, emit any and all inline
functions into the object file.
'-fkeep-static-consts'
Emit variables declared 'static const' when optimization isn't
turned on, even if the variables aren't referenced.
GCC enables this option by default. If you want to force the
compiler to check if the variable was referenced, regardless of
whether or not optimization is turned on, use the
'-fno-keep-static-consts' option.
'-fmerge-constants'
Attempt to merge identical constants (string constants and floating
point constants) across compilation units.
This option is the default for optimized compilation if the
assembler and linker support it. Use '-fno-merge-constants' to
inhibit this behavior.
Enabled at levels '-O', '-O2', '-O3', '-Os'.
'-fmerge-all-constants'
Attempt to merge identical constants and identical variables.
This option implies '-fmerge-constants'. In addition to
'-fmerge-constants' this considers e.g. even constant initialized
arrays or initialized constant variables with integral or floating
point types. Languages like C or C++ require each non-automatic
variable to have distinct location, so using this option will
result in non-conforming behavior.
'-fmodulo-sched'
Perform swing modulo scheduling immediately before the first
scheduling pass. This pass looks at innermost loops and reorders
their instructions by overlapping different iterations.
'-fmodulo-sched-allow-regmoves'
Perform more aggressive SMS based modulo scheduling with register
moves allowed. By setting this flag certain anti-dependences edges
will be deleted which will trigger the generation of reg-moves
based on the life-range analysis. This option is effective only
with '-fmodulo-sched' enabled.
'-fno-branch-count-reg'
Do not use "decrement and branch" instructions on a count register,
but instead generate a sequence of instructions that decrement a
register, compare it against zero, then branch based upon the
result. This option is only meaningful on architectures that
support such instructions, which include x86, PowerPC, IA-64 and
S/390.
The default is '-fbranch-count-reg'.
'-fno-function-cse'
Do not put function addresses in registers; make each instruction
that calls a constant function contain the function's address
explicitly.
This option results in less efficient code, but some strange hacks
that alter the assembler output may be confused by the
optimizations performed when this option is not used.
The default is '-ffunction-cse'
'-fno-zero-initialized-in-bss'
If the target supports a BSS section, GCC by default puts variables
that are initialized to zero into BSS. This can save space in the
resulting code.
This option turns off this behavior because some programs
explicitly rely on variables going to the data section. E.g., so
that the resulting executable can find the beginning of that
section and/or make assumptions based on that.
The default is '-fzero-initialized-in-bss'.
'-fmudflap -fmudflapth -fmudflapir'
For front-ends that support it (C and C++), instrument all risky
pointer/array dereferencing operations, some standard library
string/heap functions, and some other associated constructs with
range/validity tests. Modules so instrumented should be immune to
buffer overflows, invalid heap use, and some other classes of C/C++
programming errors. The instrumentation relies on a separate
runtime library ('libmudflap'), which will be linked into a program
if '-fmudflap' is given at link time. Run-time behavior of the
instrumented program is controlled by the 'MUDFLAP_OPTIONS'
environment variable. See 'env MUDFLAP_OPTIONS=-help a.out' for
its options.
Use '-fmudflapth' instead of '-fmudflap' to compile and to link if
your program is multi-threaded. Use '-fmudflapir', in addition to
'-fmudflap' or '-fmudflapth', if instrumentation should ignore
pointer reads. This produces less instrumentation (and therefore
faster execution) and still provides some protection against
outright memory corrupting writes, but allows erroneously read data
to propagate within a program.
'-fthread-jumps'
Perform optimizations where we check to see if a jump branches to a
location where another comparison subsumed by the first is found.
If so, the first branch is redirected to either the destination of
the second branch or a point immediately following it, depending on
whether the condition is known to be true or false.
Enabled at levels '-O2', '-O3', '-Os'.
'-fsplit-wide-types'
When using a type that occupies multiple registers, such as 'long
long' on a 32-bit system, split the registers apart and allocate
them independently. This normally generates better code for those
types, but may make debugging more difficult.
Enabled at levels '-O', '-O2', '-O3', '-Os'.
'-fcse-follow-jumps'
In common subexpression elimination (CSE), scan through jump
instructions when the target of the jump is not reached by any
other path. For example, when CSE encounters an 'if' statement
with an 'else' clause, CSE will follow the jump when the condition
tested is false.
Enabled at levels '-O2', '-O3', '-Os'.
'-fcse-skip-blocks'
This is similar to '-fcse-follow-jumps', but causes CSE to follow
jumps which conditionally skip over blocks. When CSE encounters a
simple 'if' statement with no else clause, '-fcse-skip-blocks'
causes CSE to follow the jump around the body of the 'if'.
Enabled at levels '-O2', '-O3', '-Os'.
'-frerun-cse-after-loop'
Re-run common subexpression elimination after loop optimizations
has been performed.
Enabled at levels '-O2', '-O3', '-Os'.
'-fgcse'
Perform a global common subexpression elimination pass. This pass
also performs global constant and copy propagation.
_Note:_ When compiling a program using computed gotos, a GCC
extension, you may get better runtime performance if you disable
the global common subexpression elimination pass by adding
'-fno-gcse' to the command line.
Enabled at levels '-O2', '-O3', '-Os'.
'-fgcse-lm'
When '-fgcse-lm' is enabled, global common subexpression
elimination will attempt to move loads which are only killed by
stores into themselves. This allows a loop containing a load/store
sequence to be changed to a load outside the loop, and a copy/store
within the loop.
Enabled by default when gcse is enabled.
'-fgcse-sm'
When '-fgcse-sm' is enabled, a store motion pass is run after
global common subexpression elimination. This pass will attempt to
move stores out of loops. When used in conjunction with
'-fgcse-lm', loops containing a load/store sequence can be changed
to a load before the loop and a store after the loop.
Not enabled at any optimization level.
'-fgcse-las'
When '-fgcse-las' is enabled, the global common subexpression
elimination pass eliminates redundant loads that come after stores
to the same memory location (both partial and full redundancies).
Not enabled at any optimization level.
'-fgcse-after-reload'
When '-fgcse-after-reload' is enabled, a redundant load elimination
pass is performed after reload. The purpose of this pass is to
cleanup redundant spilling.
'-funsafe-loop-optimizations'
If given, the loop optimizer will assume that loop indices do not
overflow, and that the loops with nontrivial exit condition are not
infinite. This enables a wider range of loop optimizations even if
the loop optimizer itself cannot prove that these assumptions are
valid. Using '-Wunsafe-loop-optimizations', the compiler will warn
you if it finds this kind of loop.
'-fcrossjumping'
Perform cross-jumping transformation. This transformation unifies
equivalent code and save code size. The resulting code may or may
not perform better than without cross-jumping.
Enabled at levels '-O2', '-O3', '-Os'.
'-fauto-inc-dec'
Combine increments or decrements of addresses with memory accesses.
This pass is always skipped on architectures that do not have
instructions to support this. Enabled by default at '-O' and
higher on architectures that support this.
'-fdce'
Perform dead code elimination (DCE) on RTL. Enabled by default at
'-O' and higher.
'-fdse'
Perform dead store elimination (DSE) on RTL. Enabled by default at
'-O' and higher.
'-fif-conversion'
Attempt to transform conditional jumps into branch-less
equivalents. This include use of conditional moves, min, max, set
flags and abs instructions, and some tricks doable by standard
arithmetics. The use of conditional execution on chips where it is
available is controlled by 'if-conversion2'.
Enabled at levels '-O', '-O2', '-O3', '-Os'.
'-fif-conversion2'
Use conditional execution (where available) to transform
conditional jumps into branch-less equivalents.
Enabled at levels '-O', '-O2', '-O3', '-Os'.
'-fdelete-null-pointer-checks'
Use global dataflow analysis to identify and eliminate useless
checks for null pointers. The compiler assumes that dereferencing
a null pointer would have halted the program. If a pointer is
checked after it has already been dereferenced, it cannot be null.
In some environments, this assumption is not true, and programs can
safely dereference null pointers. Use
'-fno-delete-null-pointer-checks' to disable this optimization for
programs which depend on that behavior.
Enabled at levels '-O2', '-O3', '-Os'.
'-fexpensive-optimizations'
Perform a number of minor optimizations that are relatively
expensive.
Enabled at levels '-O2', '-O3', '-Os'.
'-foptimize-register-move'
'-fregmove'
Attempt to reassign register numbers in move instructions and as
operands of other simple instructions in order to maximize the
amount of register tying. This is especially helpful on machines
with two-operand instructions.
Note '-fregmove' and '-foptimize-register-move' are the same
optimization.
Enabled at levels '-O2', '-O3', '-Os'.
'-fdelayed-branch'
If supported for the target machine, attempt to reorder
instructions to exploit instruction slots available after delayed
branch instructions.
Enabled at levels '-O', '-O2', '-O3', '-Os'.
'-fschedule-insns'
If supported for the target machine, attempt to reorder
instructions to eliminate execution stalls due to required data
being unavailable. This helps machines that have slow floating
point or memory load instructions by allowing other instructions to
be issued until the result of the load or floating point
instruction is required.
Enabled at levels '-O2', '-O3', '-Os'.
'-fschedule-insns2'
Similar to '-fschedule-insns', but requests an additional pass of
instruction scheduling after register allocation has been done.
This is especially useful on machines with a relatively small
number of registers and where memory load instructions take more
than one cycle.
Enabled at levels '-O2', '-O3', '-Os'.
'-fno-sched-interblock'
Don't schedule instructions across basic blocks. This is normally
enabled by default when scheduling before register allocation, i.e.
with '-fschedule-insns' or at '-O2' or higher.
'-fno-sched-spec'
Don't allow speculative motion of non-load instructions. This is
normally enabled by default when scheduling before register
allocation, i.e. with '-fschedule-insns' or at '-O2' or higher.
'-fsched-spec-load'
Allow speculative motion of some load instructions. This only
makes sense when scheduling before register allocation, i.e. with
'-fschedule-insns' or at '-O2' or higher.
'-fsched-spec-load-dangerous'
Allow speculative motion of more load instructions. This only
makes sense when scheduling before register allocation, i.e. with
'-fschedule-insns' or at '-O2' or higher.
'-fsched-stalled-insns'
'-fsched-stalled-insns=N'
Define how many insns (if any) can be moved prematurely from the
queue of stalled insns into the ready list, during the second
scheduling pass. '-fno-sched-stalled-insns' means that no insns
will be moved prematurely, '-fsched-stalled-insns=0' means there is
no limit on how many queued insns can be moved prematurely.
'-fsched-stalled-insns' without a value is equivalent to
'-fsched-stalled-insns=1'.
'-fsched-stalled-insns-dep'
'-fsched-stalled-insns-dep=N'
Define how many insn groups (cycles) will be examined for a
dependency on a stalled insn that is candidate for premature
removal from the queue of stalled insns. This has an effect only
during the second scheduling pass, and only if
'-fsched-stalled-insns' is used. '-fno-sched-stalled-insns-dep' is
equivalent to '-fsched-stalled-insns-dep=0'.
'-fsched-stalled-insns-dep' without a value is equivalent to
'-fsched-stalled-insns-dep=1'.
'-fsched2-use-superblocks'
When scheduling after register allocation, do use superblock
scheduling algorithm. Superblock scheduling allows motion across
basic block boundaries resulting on faster schedules. This option
is experimental, as not all machine descriptions used by GCC model
the CPU closely enough to avoid unreliable results from the
algorithm.
This only makes sense when scheduling after register allocation,
i.e. with '-fschedule-insns2' or at '-O2' or higher.
'-fsched2-use-traces'
Use '-fsched2-use-superblocks' algorithm when scheduling after
register allocation and additionally perform code duplication in
order to increase the size of superblocks using tracer pass. See
'-ftracer' for details on trace formation.
This mode should produce faster but significantly longer programs.
Also without '-fbranch-probabilities' the traces constructed may
not match the reality and hurt the performance. This only makes
sense when scheduling after register allocation, i.e. with
'-fschedule-insns2' or at '-O2' or higher.
'-fsee'
Eliminate redundant sign extension instructions and move the
non-redundant ones to optimal placement using lazy code motion
(LCM).
'-freschedule-modulo-scheduled-loops'
The modulo scheduling comes before the traditional scheduling, if a
loop was modulo scheduled we may want to prevent the later
scheduling passes from changing its schedule, we use this option to
control that.
'-fcaller-saves'
Enable values to be allocated in registers that will be clobbered
by function calls, by emitting extra instructions to save and
restore the registers around such calls. Such allocation is done
only when it seems to result in better code than would otherwise be
produced.
This option is always enabled by default on certain machines,
usually those which have no call-preserved registers to use
instead.
Enabled at levels '-O2', '-O3', '-Os'.
'-ftree-reassoc'
Perform reassociation on trees. This flag is enabled by default at
'-O' and higher.
'-ftree-pre'
Perform partial redundancy elimination (PRE) on trees. This flag
is enabled by default at '-O2' and '-O3'.
'-ftree-fre'
Perform full redundancy elimination (FRE) on trees. The difference
between FRE and PRE is that FRE only considers expressions that are
computed on all paths leading to the redundant computation. This
analysis is faster than PRE, though it exposes fewer redundancies.
This flag is enabled by default at '-O' and higher.
'-ftree-copy-prop'
Perform copy propagation on trees. This pass eliminates
unnecessary copy operations. This flag is enabled by default at
'-O' and higher.
'-ftree-salias'
Perform structural alias analysis on trees. This flag is enabled
by default at '-O' and higher.
'-fipa-pure-const'
Discover which functions are pure or constant. Enabled by default
at '-O' and higher.
'-fipa-reference'
Discover which static variables do not escape cannot escape the
compilation unit. Enabled by default at '-O' and higher.
'-fipa-struct-reorg'
Perform structure reorganization optimization, that change C-like
structures layout in order to better utilize spatial locality.
This transformation is affective for programs containing arrays of
structures. Available in two compilation modes: profile-based
(enabled with '-fprofile-generate') or static (which uses built-in
heuristics). Require '-fipa-type-escape' to provide the safety of
this transformation. It works only in whole program mode, so it
requires '-fwhole-program' and '-combine' to be enabled.
Structures considered 'cold' by this transformation are not
affected (see '--param struct-reorg-cold-struct-ratio=VALUE').
With this flag, the program debug info reflects a new structure
layout.
'-fipa-pta'
Perform interprocedural pointer analysis.
'-fipa-cp'
Perform interprocedural constant propagation. This optimization
analyzes the program to determine when values passed to functions
are constants and then optimizes accordingly. This optimization
can substantially increase performance if the application has
constants passed to functions, but because this optimization can
create multiple copies of functions, it may significantly increase
code size.
'-fipa-matrix-reorg'
Perform matrix flattening and transposing. Matrix flattening tries
to replace a m-dimensional matrix with its equivalent n-dimensional
matrix, where n < m. This reduces the level of indirection needed
for accessing the elements of the matrix. The second optimization
is matrix transposing that attemps to change the order of the
matrix's dimensions in order to improve cache locality. Both
optimizations need fwhole-program flag. Transposing is enabled
only if profiling information is avaliable.
'-ftree-sink'
Perform forward store motion on trees. This flag is enabled by
default at '-O' and higher.
'-ftree-ccp'
Perform sparse conditional constant propagation (CCP) on trees.
This pass only operates on local scalar variables and is enabled by
default at '-O' and higher.
'-ftree-store-ccp'
Perform sparse conditional constant propagation (CCP) on trees.
This pass operates on both local scalar variables and memory stores
and loads (global variables, structures, arrays, etc). This flag
is enabled by default at '-O2' and higher.
'-ftree-dce'
Perform dead code elimination (DCE) on trees. This flag is enabled
by default at '-O' and higher.
'-ftree-dominator-opts'
Perform a variety of simple scalar cleanups (constant/copy
propagation, redundancy elimination, range propagation and
expression simplification) based on a dominator tree traversal.
This also performs jump threading (to reduce jumps to jumps). This
flag is enabled by default at '-O' and higher.
'-ftree-dse'
Perform dead store elimination (DSE) on trees. A dead store is a
store into a memory location which will later be overwritten by
another store without any intervening loads. In this case the
earlier store can be deleted. This flag is enabled by default at
'-O' and higher.
'-ftree-ch'
Perform loop header copying on trees. This is beneficial since it
increases effectiveness of code motion optimizations. It also
saves one jump. This flag is enabled by default at '-O' and
higher. It is not enabled for '-Os', since it usually increases
code size.
'-ftree-loop-optimize'
Perform loop optimizations on trees. This flag is enabled by
default at '-O' and higher.
'-ftree-loop-linear'
Perform linear loop transformations on tree. This flag can improve
cache performance and allow further loop optimizations to take
place.
'-fcheck-data-deps'
Compare the results of several data dependence analyzers. This
option is used for debugging the data dependence analyzers.
'-ftree-loop-im'
Perform loop invariant motion on trees. This pass moves only
invariants that would be hard to handle at RTL level (function
calls, operations that expand to nontrivial sequences of insns).
With '-funswitch-loops' it also moves operands of conditions that
are invariant out of the loop, so that we can use just trivial
invariantness analysis in loop unswitching. The pass also includes
store motion.
'-ftree-loop-ivcanon'
Create a canonical counter for number of iterations in the loop for
that determining number of iterations requires complicated
analysis. Later optimizations then may determine the number
easily. Useful especially in connection with unrolling.
'-fivopts'
Perform induction variable optimizations (strength reduction,
induction variable merging and induction variable elimination) on
trees.
'-ftree-parallelize-loops=n'
Parallelize loops, i.e., split their iteration space to run in n
threads. This is only possible for loops whose iterations are
independent and can be arbitrarily reordered. The optimization is
only profitable on multiprocessor machines, for loops that are
CPU-intensive, rather than constrained e.g. by memory bandwidth.
This option implies '-pthread', and thus is only supported on
targets that have support for '-pthread'.
'-ftree-sra'
Perform scalar replacement of aggregates. This pass replaces
structure references with scalars to prevent committing structures
to memory too early. This flag is enabled by default at '-O' and
higher.
'-ftree-copyrename'
Perform copy renaming on trees. This pass attempts to rename
compiler temporaries to other variables at copy locations, usually
resulting in variable names which more closely resemble the
original variables. This flag is enabled by default at '-O' and
higher.
'-ftree-ter'
Perform temporary expression replacement during the SSA->normal
phase. Single use/single def temporaries are replaced at their use
location with their defining expression. This results in
non-GIMPLE code, but gives the expanders much more complex trees to
work on resulting in better RTL generation. This is enabled by
default at '-O' and higher.
'-ftree-vectorize'
Perform loop vectorization on trees. This flag is enabled by
default at '-O3'.
'-ftree-vect-loop-version'
Perform loop versioning when doing loop vectorization on trees.
When a loop appears to be vectorizable except that data alignment
or data dependence cannot be determined at compile time then
vectorized and non-vectorized versions of the loop are generated
along with runtime checks for alignment or dependence to control
which version is executed. This option is enabled by default
except at level '-Os' where it is disabled.
'-fvect-cost-model'
Enable cost model for vectorization.
'-ftree-vrp'
Perform Value Range Propagation on trees. This is similar to the
constant propagation pass, but instead of values, ranges of values
are propagated. This allows the optimizers to remove unnecessary
range checks like array bound checks and null pointer checks. This
is enabled by default at '-O2' and higher. Null pointer check
elimination is only done if '-fdelete-null-pointer-checks' is
enabled.
'-ftracer'
Perform tail duplication to enlarge superblock size. This
transformation simplifies the control flow of the function allowing
other optimizations to do better job.
'-funroll-loops'
Unroll loops whose number of iterations can be determined at
compile time or upon entry to the loop. '-funroll-loops' implies
'-frerun-cse-after-loop'. This option makes code larger, and may
or may not make it run faster.
'-funroll-all-loops'
Unroll all loops, even if their number of iterations is uncertain
when the loop is entered. This usually makes programs run more
slowly. '-funroll-all-loops' implies the same options as
'-funroll-loops',
'-fsplit-ivs-in-unroller'
Enables expressing of values of induction variables in later
iterations of the unrolled loop using the value in the first
iteration. This breaks long dependency chains, thus improving
efficiency of the scheduling passes.
Combination of '-fweb' and CSE is often sufficient to obtain the
same effect. However in cases the loop body is more complicated
than a single basic block, this is not reliable. It also does not
work at all on some of the architectures due to restrictions in the
CSE pass.
This optimization is enabled by default.
'-fvariable-expansion-in-unroller'
With this option, the compiler will create multiple copies of some
local variables when unrolling a loop which can result in superior
code.
'-fpredictive-commoning'
Perform predictive commoning optimization, i.e., reusing
computations (especially memory loads and stores) performed in
previous iterations of loops.
This option is enabled at level '-O3'.
'-fprefetch-loop-arrays'
If supported by the target machine, generate instructions to
prefetch memory to improve the performance of loops that access
large arrays.
This option may generate better or worse code; results are highly
dependent on the structure of loops within the source code.
Disabled at level '-Os'.
'-fno-peephole'
'-fno-peephole2'
Disable any machine-specific peephole optimizations. The
difference between '-fno-peephole' and '-fno-peephole2' is in how
they are implemented in the compiler; some targets use one, some
use the other, a few use both.
'-fpeephole' is enabled by default. '-fpeephole2' enabled at
levels '-O2', '-O3', '-Os'.
'-fno-guess-branch-probability'
Do not guess branch probabilities using heuristics.
GCC will use heuristics to guess branch probabilities if they are
not provided by profiling feedback ('-fprofile-arcs'). These
heuristics are based on the control flow graph. If some branch
probabilities are specified by '__builtin_expect', then the
heuristics will be used to guess branch probabilities for the rest
of the control flow graph, taking the '__builtin_expect' info into
account. The interactions between the heuristics and
'__builtin_expect' can be complex, and in some cases, it may be
useful to disable the heuristics so that the effects of
'__builtin_expect' are easier to understand.
The default is '-fguess-branch-probability' at levels '-O', '-O2',
'-O3', '-Os'.
'-freorder-blocks'
Reorder basic blocks in the compiled function in order to reduce
number of taken branches and improve code locality.
Enabled at levels '-O2', '-O3'.
'-freorder-blocks-and-partition'
In addition to reordering basic blocks in the compiled function, in
order to reduce number of taken branches, partitions hot and cold
basic blocks into separate sections of the assembly and .o files,
to improve paging and cache locality performance.
This optimization is automatically turned off in the presence of
exception handling, for linkonce sections, for functions with a
user-defined section attribute and on any architecture that does
not support named sections.
'-freorder-functions'
Reorder functions in the object file in order to improve code
locality. This is implemented by using special subsections
'.text.hot' for most frequently executed functions and
'.text.unlikely' for unlikely executed functions. Reordering is
done by the linker so object file format must support named
sections and linker must place them in a reasonable way.
Also profile feedback must be available in to make this option
effective. See '-fprofile-arcs' for details.
Enabled at levels '-O2', '-O3', '-Os'.
'-fstrict-aliasing'
Allows the compiler to assume the strictest aliasing rules
applicable to the language being compiled. For C (and C++), this
activates optimizations based on the type of expressions. In
particular, an object of one type is assumed never to reside at the
same address as an object of a different type, unless the types are
almost the same. For example, an 'unsigned int' can alias an
'int', but not a 'void*' or a 'double'. A character type may alias
any other type.
Pay special attention to code like this:
union a_union {
int i;
double d;
};
int f() {
a_union t;
t.d = 3.0;
return t.i;
}
The practice of reading from a different union member than the one
most recently written to (called "type-punning") is common. Even
with '-fstrict-aliasing', type-punning is allowed, provided the
memory is accessed through the union type. So, the code above will
work as expected. *Note Structures unions enumerations and
bit-fields implementation::. However, this code might not:
int f() {
a_union t;
int* ip;
t.d = 3.0;
ip = &t.i;
return *ip;
}
Similarly, access by taking the address, casting the resulting
pointer and dereferencing the result has undefined behavior, even
if the cast uses a union type, e.g.:
int f() {
double d = 3.0;
return ((union a_union *) &d)->i;
}
The '-fstrict-aliasing' option is enabled at levels '-O2', '-O3',
'-Os'.
'-fstrict-overflow'
Allow the compiler to assume strict signed overflow rules,
depending on the language being compiled. For C (and C++) this
means that overflow when doing arithmetic with signed numbers is
undefined, which means that the compiler may assume that it will
not happen. This permits various optimizations. For example, the
compiler will assume that an expression like 'i + 10 > i' will
always be true for signed 'i'. This assumption is only valid if
signed overflow is undefined, as the expression is false if 'i +
10' overflows when using twos complement arithmetic. When this
option is in effect any attempt to determine whether an operation
on signed numbers will overflow must be written carefully to not
actually involve overflow.
This option also allows the compiler to assume strict pointer
semantics: given a pointer to an object, if adding an offset to
that pointer does not produce a pointer to the same object, the
addition is undefined. This permits the compiler to conclude that
'p + u > p' is always true for a pointer 'p' and unsigned integer
'u'. This assumption is only valid because pointer wraparound is
undefined, as the expression is false if 'p + u' overflows using
twos complement arithmetic.
See also the '-fwrapv' option. Using '-fwrapv' means that integer
signed overflow is fully defined: it wraps. When '-fwrapv' is
used, there is no difference between '-fstrict-overflow' and
'-fno-strict-overflow' for integers. With '-fwrapv' certain types
of overflow are permitted. For example, if the compiler gets an
overflow when doing arithmetic on constants, the overflowed value
can still be used with '-fwrapv', but not otherwise.
The '-fstrict-overflow' option is enabled at levels '-O2', '-O3',
'-Os'.
'-falign-functions'
'-falign-functions=N'
Align the start of functions to the next power-of-two greater than
N, skipping up to N bytes. For instance, '-falign-functions=32'
aligns functions to the next 32-byte boundary, but
'-falign-functions=24' would align to the next 32-byte boundary
only if this can be done by skipping 23 bytes or less.
'-fno-align-functions' and '-falign-functions=1' are equivalent and
mean that functions will not be aligned.
Some assemblers only support this flag when N is a power of two; in
that case, it is rounded up.
If N is not specified or is zero, use a machine-dependent default.
Enabled at levels '-O2', '-O3'.
'-falign-labels'
'-falign-labels=N'
Align all branch targets to a power-of-two boundary, skipping up to
N bytes like '-falign-functions'. This option can easily make code
slower, because it must insert dummy operations for when the branch
target is reached in the usual flow of the code.
'-fno-align-labels' and '-falign-labels=1' are equivalent and mean
that labels will not be aligned.
If '-falign-loops' or '-falign-jumps' are applicable and are
greater than this value, then their values are used instead.
If N is not specified or is zero, use a machine-dependent default
which is very likely to be '1', meaning no alignment.
Enabled at levels '-O2', '-O3'.
'-falign-loops'
'-falign-loops=N'
Align loops to a power-of-two boundary, skipping up to N bytes like
'-falign-functions'. The hope is that the loop will be executed
many times, which will make up for any execution of the dummy
operations.
'-fno-align-loops' and '-falign-loops=1' are equivalent and mean
that loops will not be aligned.
If N is not specified or is zero, use a machine-dependent default.
Enabled at levels '-O2', '-O3'.
'-falign-jumps'
'-falign-jumps=N'
Align branch targets to a power-of-two boundary, for branch targets
where the targets can only be reached by jumping, skipping up to N
bytes like '-falign-functions'. In this case, no dummy operations
need be executed.
'-fno-align-jumps' and '-falign-jumps=1' are equivalent and mean
that loops will not be aligned.
If N is not specified or is zero, use a machine-dependent default.
Enabled at levels '-O2', '-O3'.
'-funit-at-a-time'
Parse the whole compilation unit before starting to produce code.
This allows some extra optimizations to take place but consumes
more memory (in general). There are some compatibility issues with
_unit-at-a-time_ mode:
* enabling _unit-at-a-time_ mode may change the order in which
functions, variables, and top-level 'asm' statements are
emitted, and will likely break code relying on some particular
ordering. The majority of such top-level 'asm' statements,
though, can be replaced by 'section' attributes. The
'fno-toplevel-reorder' option may be used to keep the ordering
used in the input file, at the cost of some optimizations.
* _unit-at-a-time_ mode removes unreferenced static variables
and functions. This may result in undefined references when
an 'asm' statement refers directly to variables or functions
that are otherwise unused. In that case either the
variable/function shall be listed as an operand of the 'asm'
statement operand or, in the case of top-level 'asm'
statements the attribute 'used' shall be used on the
declaration.
* Static functions now can use non-standard passing conventions
that may break 'asm' statements calling functions directly.
Again, attribute 'used' will prevent this behavior.
As a temporary workaround, '-fno-unit-at-a-time' can be used, but
this scheme may not be supported by future releases of GCC.
Enabled at levels '-O', '-O2', '-O3', '-Os'.
'-fno-toplevel-reorder'
Do not reorder top-level functions, variables, and 'asm'
statements. Output them in the same order that they appear in the
input file. When this option is used, unreferenced static
variables will not be removed. This option is intended to support
existing code which relies on a particular ordering. For new code,
it is better to use attributes.
'-fweb'
Constructs webs as commonly used for register allocation purposes
and assign each web individual pseudo register. This allows the
register allocation pass to operate on pseudos directly, but also
strengthens several other optimization passes, such as CSE, loop
optimizer and trivial dead code remover. It can, however, make
debugging impossible, since variables will no longer stay in a
"home register".
Enabled by default with '-funroll-loops'.
'-fwhole-program'
Assume that the current compilation unit represents whole program
being compiled. All public functions and variables with the
exception of 'main' and those merged by attribute
'externally_visible' become static functions and in a affect gets
more aggressively optimized by interprocedural optimizers. While
this option is equivalent to proper use of 'static' keyword for
programs consisting of single file, in combination with option
'--combine' this flag can be used to compile most of smaller scale
C programs since the functions and variables become local for the
whole combined compilation unit, not for the single source file
itself.
This option is not supported for Fortran programs.
'-fcprop-registers'
After register allocation and post-register allocation instruction
splitting, we perform a copy-propagation pass to try to reduce
scheduling dependencies and occasionally eliminate the copy.
Enabled at levels '-O', '-O2', '-O3', '-Os'.
'-fprofile-generate'
Enable options usually used for instrumenting application to
produce profile useful for later recompilation with profile
feedback based optimization. You must use '-fprofile-generate'
both when compiling and when linking your program.
The following options are enabled: '-fprofile-arcs',
'-fprofile-values', '-fvpt'.
'-fprofile-use'
Enable profile feedback directed optimizations, and optimizations
generally profitable only with profile feedback available.
The following options are enabled: '-fbranch-probabilities',
'-fvpt', '-funroll-loops', '-fpeel-loops', '-ftracer'
By default, GCC emits an error message if the feedback profiles do
not match the source code. This error can be turned into a warning
by using '-Wcoverage-mismatch'. Note this may result in poorly
optimized code.
The following options control compiler behavior regarding floating
point arithmetic. These options trade off between speed and
correctness. All must be specifically enabled.
'-ffloat-store'
Do not store floating point variables in registers, and inhibit
other options that might change whether a floating point value is
taken from a register or memory.
This option prevents undesirable excess precision on machines such
as the 68000 where the floating registers (of the 68881) keep more
precision than a 'double' is supposed to have. Similarly for the
x86 architecture. For most programs, the excess precision does
only good, but a few programs rely on the precise definition of
IEEE floating point. Use '-ffloat-store' for such programs, after
modifying them to store all pertinent intermediate computations
into variables.
'-ffast-math'
Sets '-fno-math-errno', '-funsafe-math-optimizations',
'-ffinite-math-only', '-fno-rounding-math', '-fno-signaling-nans'
and '-fcx-limited-range'.
This option causes the preprocessor macro '__FAST_MATH__' to be
defined.
This option is not turned on by any '-O' option since it can result
in incorrect output for programs which depend on an exact
implementation of IEEE or ISO rules/specifications for math
functions. It may, however, yield faster code for programs that do
not require the guarantees of these specifications.
'-fno-math-errno'
Do not set ERRNO after calling math functions that are executed
with a single instruction, e.g., sqrt. A program that relies on
IEEE exceptions for math error handling may want to use this flag
for speed while maintaining IEEE arithmetic compatibility.
This option is not turned on by any '-O' option since it can result
in incorrect output for programs which depend on an exact
implementation of IEEE or ISO rules/specifications for math
functions. It may, however, yield faster code for programs that do
not require the guarantees of these specifications.
The default is '-fmath-errno'.
On Darwin systems, the math library never sets 'errno'. There is
therefore no reason for the compiler to consider the possibility
that it might, and '-fno-math-errno' is the default.
'-funsafe-math-optimizations'
Allow optimizations for floating-point arithmetic that (a) assume
that arguments and results are valid and (b) may violate IEEE or
ANSI standards. When used at link-time, it may include libraries
or startup files that change the default FPU control word or other
similar optimizations.
This option is not turned on by any '-O' option since it can result
in incorrect output for programs which depend on an exact
implementation of IEEE or ISO rules/specifications for math
functions. It may, however, yield faster code for programs that do
not require the guarantees of these specifications. Enables
'-fno-signed-zeros', '-fno-trapping-math', '-fassociative-math' and
'-freciprocal-math'.
The default is '-fno-unsafe-math-optimizations'.
'-fassociative-math'
Allow re-association of operands in series of floating-point
operations. This violates the ISO C and C++ language standard by
possibly changing computation result. NOTE: re-ordering may change
the sign of zero as well as ignore NaNs and inhibit or create
underflow or overflow (and thus cannot be used on a code which
relies on rounding behavior like '(x + 2**52) - 2**52)'. May also
reorder floating-point comparisons and thus may not be used when
ordered comparisons are required. This option requires that both
'-fno-signed-zeros' and '-fno-trapping-math' be in effect.
Moreover, it doesn't make much sense with '-frounding-math'.
The default is '-fno-associative-math'.
'-freciprocal-math'
Allow the reciprocal of a value to be used instead of dividing by
the value if this enables optimizations. For example 'x / y' can
be replaced with 'x * (1/y)' which is useful if '(1/y)' is subject
to common subexpression elimination. Note that this loses
precision and increases the number of flops operating on the value.
The default is '-fno-reciprocal-math'.
'-ffinite-math-only'
Allow optimizations for floating-point arithmetic that assume that
arguments and results are not NaNs or +-Infs.
This option is not turned on by any '-O' option since it can result
in incorrect output for programs which depend on an exact
implementation of IEEE or ISO rules/specifications for math
functions. It may, however, yield faster code for programs that do
not require the guarantees of these specifications.
The default is '-fno-finite-math-only'.
'-fno-signed-zeros'
Allow optimizations for floating point arithmetic that ignore the
signedness of zero. IEEE arithmetic specifies the behavior of
distinct +0.0 and -0.0 values, which then prohibits simplification
of expressions such as x+0.0 or 0.0*x (even with
'-ffinite-math-only'). This option implies that the sign of a zero
result isn't significant.
The default is '-fsigned-zeros'.
'-fno-trapping-math'
Compile code assuming that floating-point operations cannot
generate user-visible traps. These traps include division by zero,
overflow, underflow, inexact result and invalid operation. This
option requires that '-fno-signaling-nans' be in effect. Setting
this option may allow faster code if one relies on "non-stop" IEEE
arithmetic, for example.
This option should never be turned on by any '-O' option since it
can result in incorrect output for programs which depend on an
exact implementation of IEEE or ISO rules/specifications for math
functions.
The default is '-ftrapping-math'.
'-frounding-math'
Disable transformations and optimizations that assume default
floating point rounding behavior. This is round-to-zero for all
floating point to integer conversions, and round-to-nearest for all
other arithmetic truncations. This option should be specified for
programs that change the FP rounding mode dynamically, or that may
be executed with a non-default rounding mode. This option disables
constant folding of floating point expressions at compile-time
(which may be affected by rounding mode) and arithmetic
transformations that are unsafe in the presence of sign-dependent
rounding modes.
The default is '-fno-rounding-math'.
This option is experimental and does not currently guarantee to
disable all GCC optimizations that are affected by rounding mode.
Future versions of GCC may provide finer control of this setting
using C99's 'FENV_ACCESS' pragma. This command line option will be
used to specify the default state for 'FENV_ACCESS'.
'-frtl-abstract-sequences'
It is a size optimization method. This option is to find identical
sequences of code, which can be turned into pseudo-procedures and
then replace all occurrences with calls to the newly created
subroutine. It is kind of an opposite of '-finline-functions'.
This optimization runs at RTL level.
'-fsignaling-nans'
Compile code assuming that IEEE signaling NaNs may generate
user-visible traps during floating-point operations. Setting this
option disables optimizations that may change the number of
exceptions visible with signaling NaNs. This option implies
'-ftrapping-math'.
This option causes the preprocessor macro '__SUPPORT_SNAN__' to be
defined.
The default is '-fno-signaling-nans'.
This option is experimental and does not currently guarantee to
disable all GCC optimizations that affect signaling NaN behavior.
'-fsingle-precision-constant'
Treat floating point constant as single precision constant instead
of implicitly converting it to double precision constant.
'-fcx-limited-range'
When enabled, this option states that a range reduction step is not
needed when performing complex division. The default is
'-fno-cx-limited-range', but is enabled by '-ffast-math'.
This option controls the default setting of the ISO C99
'CX_LIMITED_RANGE' pragma. Nevertheless, the option applies to all
languages.
The following options control optimizations that may improve
performance, but are not enabled by any '-O' options. This section
includes experimental options that may produce broken code.
'-fbranch-probabilities'
After running a program compiled with '-fprofile-arcs' (*note
Options for Debugging Your Program or 'gcc': Debugging Options.),
you can compile it a second time using '-fbranch-probabilities', to
improve optimizations based on the number of times each branch was
taken. When the program compiled with '-fprofile-arcs' exits it
saves arc execution counts to a file called 'SOURCENAME.gcda' for
each source file. The information in this data file is very
dependent on the structure of the generated code, so you must use
the same source code and the same optimization options for both
compilations.
With '-fbranch-probabilities', GCC puts a 'REG_BR_PROB' note on
each 'JUMP_INSN' and 'CALL_INSN'. These can be used to improve
optimization. Currently, they are only used in one place: in
'reorg.c', instead of guessing which path a branch is mostly to
take, the 'REG_BR_PROB' values are used to exactly determine which
path is taken more often.
'-fprofile-values'
If combined with '-fprofile-arcs', it adds code so that some data
about values of expressions in the program is gathered.
With '-fbranch-probabilities', it reads back the data gathered from
profiling values of expressions and adds 'REG_VALUE_PROFILE' notes
to instructions for their later usage in optimizations.
Enabled with '-fprofile-generate' and '-fprofile-use'.
'-fvpt'
If combined with '-fprofile-arcs', it instructs the compiler to add
a code to gather information about values of expressions.
With '-fbranch-probabilities', it reads back the data gathered and
actually performs the optimizations based on them. Currently the
optimizations include specialization of division operation using
the knowledge about the value of the denominator.
'-frename-registers'
Attempt to avoid false dependencies in scheduled code by making use
of registers left over after register allocation. This
optimization will most benefit processors with lots of registers.
Depending on the debug information format adopted by the target,
however, it can make debugging impossible, since variables will no
longer stay in a "home register".
Enabled by default with '-funroll-loops'.
'-ftracer'
Perform tail duplication to enlarge superblock size. This
transformation simplifies the control flow of the function allowing
other optimizations to do better job.
Enabled with '-fprofile-use'.
'-funroll-loops'
Unroll loops whose number of iterations can be determined at
compile time or upon entry to the loop. '-funroll-loops' implies
'-frerun-cse-after-loop', '-fweb' and '-frename-registers'. It
also turns on complete loop peeling (i.e. complete removal of loops
with small constant number of iterations). This option makes code
larger, and may or may not make it run faster.
Enabled with '-fprofile-use'.
'-funroll-all-loops'
Unroll all loops, even if their number of iterations is uncertain
when the loop is entered. This usually makes programs run more
slowly. '-funroll-all-loops' implies the same options as
'-funroll-loops'.
'-fpeel-loops'
Peels the loops for that there is enough information that they do
not roll much (from profile feedback). It also turns on complete
loop peeling (i.e. complete removal of loops with small constant
number of iterations).
Enabled with '-fprofile-use'.
'-fmove-loop-invariants'
Enables the loop invariant motion pass in the RTL loop optimizer.
Enabled at level '-O1'
'-funswitch-loops'
Move branches with loop invariant conditions out of the loop, with
duplicates of the loop on both branches (modified according to
result of the condition).
'-ffunction-sections'
'-fdata-sections'
Place each function or data item into its own section in the output
file if the target supports arbitrary sections. The name of the
function or the name of the data item determines the section's name
in the output file.
Use these options on systems where the linker can perform
optimizations to improve locality of reference in the instruction
space. Most systems using the ELF object format and SPARC
processors running Solaris 2 have linkers with such optimizations.
AIX may have these optimizations in the future.
Only use these options when there are significant benefits from
doing so. When you specify these options, the assembler and linker
will create larger object and executable files and will also be
slower. You will not be able to use 'gprof' on all systems if you
specify this option and you may have problems with debugging if you
specify both this option and '-g'.
'-fbranch-target-load-optimize'
Perform branch target register load optimization before prologue /
epilogue threading. The use of target registers can typically be
exposed only during reload, thus hoisting loads out of loops and
doing inter-block scheduling needs a separate optimization pass.
'-fbranch-target-load-optimize2'
Perform branch target register load optimization after prologue /
epilogue threading.
'-fbtr-bb-exclusive'
When performing branch target register load optimization, don't
reuse branch target registers in within any basic block.
'-fstack-protector'
Emit extra code to check for buffer overflows, such as stack
smashing attacks. This is done by adding a guard variable to
functions with vulnerable objects. This includes functions that
call alloca, and functions with buffers larger than 8 bytes. The
guards are initialized when a function is entered and then checked
when the function exits. If a guard check fails, an error message
is printed and the program exits.
'-fstack-protector-all'
Like '-fstack-protector' except that all functions are protected.
'-fsection-anchors'
Try to reduce the number of symbolic address calculations by using
shared "anchor" symbols to address nearby objects. This
transformation can help to reduce the number of GOT entries and GOT
accesses on some targets.
For example, the implementation of the following function 'foo':
static int a, b, c;
int foo (void) { return a + b + c; }
would usually calculate the addresses of all three variables, but
if you compile it with '-fsection-anchors', it will access the
variables from a common anchor point instead. The effect is
similar to the following pseudocode (which isn't valid C):
int foo (void)
{
register int *xr = &x;
return xr[&a - &x] + xr[&b - &x] + xr[&c - &x];
}
Not all targets support this option.
'--param NAME=VALUE'
In some places, GCC uses various constants to control the amount of
optimization that is done. For example, GCC will not inline
functions that contain more that a certain number of instructions.
You can control some of these constants on the command-line using
the '--param' option.
The names of specific parameters, and the meaning of the values,
are tied to the internals of the compiler, and are subject to
change without notice in future releases.
In each case, the VALUE is an integer. The allowable choices for
NAME are given in the following table:
'salias-max-implicit-fields'
The maximum number of fields in a variable without direct
structure accesses for which structure aliasing will consider
trying to track each field. The default is 5
'salias-max-array-elements'
The maximum number of elements an array can have and its
elements still be tracked individually by structure aliasing.
The default is 4
'sra-max-structure-size'
The maximum structure size, in bytes, at which the scalar
replacement of aggregates (SRA) optimization will perform
block copies. The default value, 0, implies that GCC will
select the most appropriate size itself.
'sra-field-structure-ratio'
The threshold ratio (as a percentage) between instantiated
fields and the complete structure size. We say that if the
ratio of the number of bytes in instantiated fields to the
number of bytes in the complete structure exceeds this
parameter, then block copies are not used. The default is 75.
'struct-reorg-cold-struct-ratio'
The threshold ratio (as a percentage) between a structure
frequency and the frequency of the hottest structure in the
program. This parameter is used by struct-reorg optimization
enabled by '-fipa-struct-reorg'. We say that if the ratio of
a structure frequency, calculated by profiling, to the hottest
structure frequency in the program is less than this
parameter, then structure reorganization is not applied to
this structure. The default is 10.
'max-crossjump-edges'
The maximum number of incoming edges to consider for
crossjumping. The algorithm used by '-fcrossjumping' is
O(N^2) in the number of edges incoming to each block.
Increasing values mean more aggressive optimization, making
the compile time increase with probably small improvement in
executable size.
'min-crossjump-insns'
The minimum number of instructions which must be matched at
the end of two blocks before crossjumping will be performed on
them. This value is ignored in the case where all
instructions in the block being crossjumped from are matched.
The default value is 5.
'max-grow-copy-bb-insns'
The maximum code size expansion factor when copying basic
blocks instead of jumping. The expansion is relative to a
jump instruction. The default value is 8.
'max-goto-duplication-insns'
The maximum number of instructions to duplicate to a block
that jumps to a computed goto. To avoid O(N^2) behavior in a
number of passes, GCC factors computed gotos early in the
compilation process, and unfactors them as late as possible.
Only computed jumps at the end of a basic blocks with no more
than max-goto-duplication-insns are unfactored. The default
value is 8.
'max-delay-slot-insn-search'
The maximum number of instructions to consider when looking
for an instruction to fill a delay slot. If more than this
arbitrary number of instructions is searched, the time savings
from filling the delay slot will be minimal so stop searching.
Increasing values mean more aggressive optimization, making
the compile time increase with probably small improvement in
executable run time.
'max-delay-slot-live-search'
When trying to fill delay slots, the maximum number of
instructions to consider when searching for a block with valid
live register information. Increasing this arbitrarily chosen
value means more aggressive optimization, increasing the
compile time. This parameter should be removed when the delay
slot code is rewritten to maintain the control-flow graph.
'max-gcse-memory'
The approximate maximum amount of memory that will be
allocated in order to perform the global common subexpression
elimination optimization. If more memory than specified is
required, the optimization will not be done.
'max-gcse-passes'
The maximum number of passes of GCSE to run. The default is
1.
'max-pending-list-length'
The maximum number of pending dependencies scheduling will
allow before flushing the current state and starting over.
Large functions with few branches or calls can create
excessively large lists which needlessly consume memory and
resources.
'max-inline-insns-single'
Several parameters control the tree inliner used in gcc. This
number sets the maximum number of instructions (counted in
GCC's internal representation) in a single function that the
tree inliner will consider for inlining. This only affects
functions declared inline and methods implemented in a class
declaration (C++). The default value is 450.
'max-inline-insns-auto'
When you use '-finline-functions' (included in '-O3'), a lot
of functions that would otherwise not be considered for
inlining by the compiler will be investigated. To those
functions, a different (more restrictive) limit compared to
functions declared inline can be applied. The default value
is 90.
'large-function-insns'
The limit specifying really large functions. For functions
larger than this limit after inlining inlining is constrained
by '--param large-function-growth'. This parameter is useful
primarily to avoid extreme compilation time caused by
non-linear algorithms used by the backend. This parameter is
ignored when '-funit-at-a-time' is not used. The default
value is 2700.
'large-function-growth'
Specifies maximal growth of large function caused by inlining
in percents. This parameter is ignored when
'-funit-at-a-time' is not used. The default value is 100
which limits large function growth to 2.0 times the original
size.
'large-unit-insns'
The limit specifying large translation unit. Growth caused by
inlining of units larger than this limit is limited by
'--param inline-unit-growth'. For small units this might be
too tight (consider unit consisting of function A that is
inline and B that just calls A three time. If B is small
relative to A, the growth of unit is 300\% and yet such
inlining is very sane. For very large units consisting of
small inlineable functions however the overall unit growth
limit is needed to avoid exponential explosion of code size.
Thus for smaller units, the size is increased to '--param
large-unit-insns' before applying '--param
inline-unit-growth'. The default is 10000
'inline-unit-growth'
Specifies maximal overall growth of the compilation unit
caused by inlining. This parameter is ignored when
'-funit-at-a-time' is not used. The default value is 30 which
limits unit growth to 1.3 times the original size.
'large-stack-frame'
The limit specifying large stack frames. While inlining the
algorithm is trying to not grow past this limit too much.
Default value is 256 bytes.
'large-stack-frame-growth'
Specifies maximal growth of large stack frames caused by
inlining in percents. The default value is 1000 which limits
large stack frame growth to 11 times the original size.
'max-inline-insns-recursive'
'max-inline-insns-recursive-auto'
Specifies maximum number of instructions out-of-line copy of
self recursive inline function can grow into by performing
recursive inlining.
For functions declared inline '--param
max-inline-insns-recursive' is taken into account. For
function not declared inline, recursive inlining happens only
when '-finline-functions' (included in '-O3') is enabled and
'--param max-inline-insns-recursive-auto' is used. The
default value is 450.
'max-inline-recursive-depth'
'max-inline-recursive-depth-auto'
Specifies maximum recursion depth used by the recursive
inlining.
For functions declared inline '--param
max-inline-recursive-depth' is taken into account. For
function not declared inline, recursive inlining happens only
when '-finline-functions' (included in '-O3') is enabled and
'--param max-inline-recursive-depth-auto' is used. The
default value is 8.
'min-inline-recursive-probability'
Recursive inlining is profitable only for function having deep
recursion in average and can hurt for function having little
recursion depth by increasing the prologue size or complexity
of function body to other optimizers.
When profile feedback is available (see '-fprofile-generate')
the actual recursion depth can be guessed from probability
that function will recurse via given call expression. This
parameter limits inlining only to call expression whose
probability exceeds given threshold (in percents). The
default value is 10.
'inline-call-cost'
Specify cost of call instruction relative to simple
arithmetics operations (having cost of 1). Increasing this
cost disqualifies inlining of non-leaf functions and at the
same time increases size of leaf function that is believed to
reduce function size by being inlined. In effect it increases
amount of inlining for code having large abstraction penalty
(many functions that just pass the arguments to other
functions) and decrease inlining for code with low abstraction
penalty. The default value is 12.
'min-vect-loop-bound'
The minimum number of iterations under which a loop will not
get vectorized when '-ftree-vectorize' is used. The number of
iterations after vectorization needs to be greater than the
value specified by this option to allow vectorization. The
default value is 0.
'max-unrolled-insns'
The maximum number of instructions that a loop should have if
that loop is unrolled, and if the loop is unrolled, it
determines how many times the loop code is unrolled.
'max-average-unrolled-insns'
The maximum number of instructions biased by probabilities of
their execution that a loop should have if that loop is
unrolled, and if the loop is unrolled, it determines how many
times the loop code is unrolled.
'max-unroll-times'
The maximum number of unrollings of a single loop.
'max-peeled-insns'
The maximum number of instructions that a loop should have if
that loop is peeled, and if the loop is peeled, it determines
how many times the loop code is peeled.
'max-peel-times'
The maximum number of peelings of a single loop.
'max-completely-peeled-insns'
The maximum number of insns of a completely peeled loop.
'max-completely-peel-times'
The maximum number of iterations of a loop to be suitable for
complete peeling.
'max-unswitch-insns'
The maximum number of insns of an unswitched loop.
'max-unswitch-level'
The maximum number of branches unswitched in a single loop.
'lim-expensive'
The minimum cost of an expensive expression in the loop
invariant motion.
'iv-consider-all-candidates-bound'
Bound on number of candidates for induction variables below
that all candidates are considered for each use in induction
variable optimizations. Only the most relevant candidates are
considered if there are more candidates, to avoid quadratic
time complexity.
'iv-max-considered-uses'
The induction variable optimizations give up on loops that
contain more induction variable uses.
'iv-always-prune-cand-set-bound'
If number of candidates in the set is smaller than this value,
we always try to remove unnecessary ivs from the set during
its optimization when a new iv is added to the set.
'scev-max-expr-size'
Bound on size of expressions used in the scalar evolutions
analyzer. Large expressions slow the analyzer.
'omega-max-vars'
The maximum number of variables in an Omega constraint system.
The default value is 128.
'omega-max-geqs'
The maximum number of inequalities in an Omega constraint
system. The default value is 256.
'omega-max-eqs'
The maximum number of equalities in an Omega constraint
system. The default value is 128.
'omega-max-wild-cards'
The maximum number of wildcard variables that the Omega solver
will be able to insert. The default value is 18.
'omega-hash-table-size'
The size of the hash table in the Omega solver. The default
value is 550.
'omega-max-keys'
The maximal number of keys used by the Omega solver. The
default value is 500.
'omega-eliminate-redundant-constraints'
When set to 1, use expensive methods to eliminate all
redundant constraints. The default value is 0.
'vect-max-version-for-alignment-checks'
The maximum number of runtime checks that can be performed
when doing loop versioning for alignment in the vectorizer.
See option ftree-vect-loop-version for more information.
'vect-max-version-for-alias-checks'
The maximum number of runtime checks that can be performed
when doing loop versioning for alias in the vectorizer. See
option ftree-vect-loop-version for more information.
'max-iterations-to-track'
The maximum number of iterations of a loop the brute force
algorithm for analysis of # of iterations of the loop tries to
evaluate.
'hot-bb-count-fraction'
Select fraction of the maximal count of repetitions of basic
block in program given basic block needs to have to be
considered hot.
'hot-bb-frequency-fraction'
Select fraction of the maximal frequency of executions of
basic block in function given basic block needs to have to be
considered hot
'max-predicted-iterations'
The maximum number of loop iterations we predict statically.
This is useful in cases where function contain single loop
with known bound and other loop with unknown. We predict the
known number of iterations correctly, while the unknown number
of iterations average to roughly 10. This means that the loop
without bounds would appear artificially cold relative to the
other one.
'align-threshold'
Select fraction of the maximal frequency of executions of
basic block in function given basic block will get aligned.
'align-loop-iterations'
A loop expected to iterate at lest the selected number of
iterations will get aligned.
'tracer-dynamic-coverage'
'tracer-dynamic-coverage-feedback'
This value is used to limit superblock formation once the
given percentage of executed instructions is covered. This
limits unnecessary code size expansion.
The 'tracer-dynamic-coverage-feedback' is used only when
profile feedback is available. The real profiles (as opposed
to statically estimated ones) are much less balanced allowing
the threshold to be larger value.
'tracer-max-code-growth'
Stop tail duplication once code growth has reached given
percentage. This is rather hokey argument, as most of the
duplicates will be eliminated later in cross jumping, so it
may be set to much higher values than is the desired code
growth.
'tracer-min-branch-ratio'
Stop reverse growth when the reverse probability of best edge
is less than this threshold (in percent).
'tracer-min-branch-ratio'
'tracer-min-branch-ratio-feedback'
Stop forward growth if the best edge do have probability lower
than this threshold.
Similarly to 'tracer-dynamic-coverage' two values are present,
one for compilation for profile feedback and one for
compilation without. The value for compilation with profile
feedback needs to be more conservative (higher) in order to
make tracer effective.
'max-cse-path-length'
Maximum number of basic blocks on path that cse considers.
The default is 10.
'max-cse-insns'
The maximum instructions CSE process before flushing. The
default is 1000.
'max-aliased-vops'
Maximum number of virtual operands per function allowed to
represent aliases before triggering the alias partitioning
heuristic. Alias partitioning reduces compile times and
memory consumption needed for aliasing at the expense of
precision loss in alias information. The default value for
this parameter is 100 for -O1, 500 for -O2 and 1000 for -O3.
Notice that if a function contains more memory statements than
the value of this parameter, it is not really possible to
achieve this reduction. In this case, the compiler will use
the number of memory statements as the value for
'max-aliased-vops'.
'avg-aliased-vops'
Average number of virtual operands per statement allowed to
represent aliases before triggering the alias partitioning
heuristic. This works in conjunction with 'max-aliased-vops'.
If a function contains more than 'max-aliased-vops' virtual
operators, then memory symbols will be grouped into memory
partitions until either the total number of virtual operators
is below 'max-aliased-vops' or the average number of virtual
operators per memory statement is below 'avg-aliased-vops'.
The default value for this parameter is 1 for -O1 and -O2, and
3 for -O3.
'ggc-min-expand'
GCC uses a garbage collector to manage its own memory
allocation. This parameter specifies the minimum percentage
by which the garbage collector's heap should be allowed to
expand between collections. Tuning this may improve
compilation speed; it has no effect on code generation.
The default is 30% + 70% * (RAM/1GB) with an upper bound of
100% when RAM >= 1GB. If 'getrlimit' is available, the notion
of "RAM" is the smallest of actual RAM and 'RLIMIT_DATA' or
'RLIMIT_AS'. If GCC is not able to calculate RAM on a
particular platform, the lower bound of 30% is used. Setting
this parameter and 'ggc-min-heapsize' to zero causes a full
collection to occur at every opportunity. This is extremely
slow, but can be useful for debugging.
'ggc-min-heapsize'
Minimum size of the garbage collector's heap before it begins
bothering to collect garbage. The first collection occurs
after the heap expands by 'ggc-min-expand'% beyond
'ggc-min-heapsize'. Again, tuning this may improve
compilation speed, and has no effect on code generation.
The default is the smaller of RAM/8, RLIMIT_RSS, or a limit
which tries to ensure that RLIMIT_DATA or RLIMIT_AS are not
exceeded, but with a lower bound of 4096 (four megabytes) and
an upper bound of 131072 (128 megabytes). If GCC is not able
to calculate RAM on a particular platform, the lower bound is
used. Setting this parameter very large effectively disables
garbage collection. Setting this parameter and
'ggc-min-expand' to zero causes a full collection to occur at
every opportunity.
'max-reload-search-insns'
The maximum number of instruction reload should look backward
for equivalent register. Increasing values mean more
aggressive optimization, making the compile time increase with
probably slightly better performance. The default value is
100.
'max-cselib-memory-locations'
The maximum number of memory locations cselib should take into
account. Increasing values mean more aggressive optimization,
making the compile time increase with probably slightly better
performance. The default value is 500.
'max-flow-memory-locations'
Similar as 'max-cselib-memory-locations' but for dataflow
liveness. The default value is 100.
'reorder-blocks-duplicate'
'reorder-blocks-duplicate-feedback'
Used by basic block reordering pass to decide whether to use
unconditional branch or duplicate the code on its destination.
Code is duplicated when its estimated size is smaller than
this value multiplied by the estimated size of unconditional
jump in the hot spots of the program.
The 'reorder-block-duplicate-feedback' is used only when
profile feedback is available and may be set to higher values
than 'reorder-block-duplicate' since information about the hot
spots is more accurate.
'max-sched-ready-insns'
The maximum number of instructions ready to be issued the
scheduler should consider at any given time during the first
scheduling pass. Increasing values mean more thorough
searches, making the compilation time increase with probably
little benefit. The default value is 100.
'max-sched-region-blocks'
The maximum number of blocks in a region to be considered for
interblock scheduling. The default value is 10.
'max-sched-region-insns'
The maximum number of insns in a region to be considered for
interblock scheduling. The default value is 100.
'min-spec-prob'
The minimum probability (in percents) of reaching a source
block for interblock speculative scheduling. The default
value is 40.
'max-sched-extend-regions-iters'
The maximum number of iterations through CFG to extend
regions. 0 - disable region extension, N - do at most N
iterations. The default value is 0.
'max-sched-insn-conflict-delay'
The maximum conflict delay for an insn to be considered for
speculative motion. The default value is 3.
'sched-spec-prob-cutoff'
The minimal probability of speculation success (in percents),
so that speculative insn will be scheduled. The default value
is 40.
'max-last-value-rtl'
The maximum size measured as number of RTLs that can be
recorded in an expression in combiner for a pseudo register as
last known value of that register. The default is 10000.
'integer-share-limit'
Small integer constants can use a shared data structure,
reducing the compiler's memory usage and increasing its speed.
This sets the maximum value of a shared integer constant. The
default value is 256.
'min-virtual-mappings'
Specifies the minimum number of virtual mappings in the
incremental SSA updater that should be registered to trigger
the virtual mappings heuristic defined by
virtual-mappings-ratio. The default value is 100.
'virtual-mappings-ratio'
If the number of virtual mappings is virtual-mappings-ratio
bigger than the number of virtual symbols to be updated, then
the incremental SSA updater switches to a full update for
those symbols. The default ratio is 3.
'ssp-buffer-size'
The minimum size of buffers (i.e. arrays) that will receive
stack smashing protection when '-fstack-protection' is used.
'max-jump-thread-duplication-stmts'
Maximum number of statements allowed in a block that needs to
be duplicated when threading jumps.
'max-fields-for-field-sensitive'
Maximum number of fields in a structure we will treat in a
field sensitive manner during pointer analysis. The default
is zero for -O0, and -O1 and 100 for -Os, -O2, and -O3.
'prefetch-latency'
Estimate on average number of instructions that are executed
before prefetch finishes. The distance we prefetch ahead is
proportional to this constant. Increasing this number may
also lead to less streams being prefetched (see
'simultaneous-prefetches').
'simultaneous-prefetches'
Maximum number of prefetches that can run at the same time.
'l1-cache-line-size'
The size of cache line in L1 cache, in bytes.
'l1-cache-size'
The size of L1 cache, in kilobytes.
'l2-cache-size'
The size of L2 cache, in kilobytes.
'use-canonical-types'
Whether the compiler should use the "canonical" type system.
By default, this should always be 1, which uses a more
efficient internal mechanism for comparing types in C++ and
Objective-C++. However, if bugs in the canonical type system
are causing compilation failures, set this value to 0 to
disable canonical types.
'max-partial-antic-length'
Maximum length of the partial antic set computed during the
tree partial redundancy elimination optimization
('-ftree-pre') when optimizing at '-O3' and above. For some
sorts of source code the enhanced partial redundancy
elimination optimization can run away, consuming all of the
memory available on the host machine. This parameter sets a
limit on the length of the sets that are computed, which
prevents the runaway behaviour. Setting a value of 0 for this
paramter will allow an unlimited set length.
'sccvn-max-scc-size'
Maximum size of a strongly connected component (SCC) during
SCCVN processing. If this limit is hit, SCCVN processing for
the whole function will not be done and optimizations
depending on it will be disabled. The default maximum SCC
size is 10000.

File: gcc.info, Node: Preprocessor Options, Next: Assembler Options, Prev: Optimize Options, Up: Invoking GCC
3.11 Options Controlling the Preprocessor
=========================================
These options control the C preprocessor, which is run on each C source
file before actual compilation.
If you use the '-E' option, nothing is done except preprocessing. Some
of these options make sense only together with '-E' because they cause
the preprocessor output to be unsuitable for actual compilation.
You can use '-Wp,OPTION' to bypass the compiler driver and pass
OPTION directly through to the preprocessor. If OPTION contains
commas, it is split into multiple options at the commas. However,
many options are modified, translated or interpreted by the
compiler driver before being passed to the preprocessor, and '-Wp'
forcibly bypasses this phase. The preprocessor's direct interface
is undocumented and subject to change, so whenever possible you
should avoid using '-Wp' and let the driver handle the options
instead.
'-Xpreprocessor OPTION'
Pass OPTION as an option to the preprocessor. You can use this to
supply system-specific preprocessor options which GCC does not know
how to recognize.
If you want to pass an option that takes an argument, you must use
'-Xpreprocessor' twice, once for the option and once for the
argument.
'-D NAME'
Predefine NAME as a macro, with definition '1'.
'-D NAME=DEFINITION'
The contents of DEFINITION are tokenized and processed as if they
appeared during translation phase three in a '#define' directive.
In particular, the definition will be truncated by embedded newline
characters.
If you are invoking the preprocessor from a shell or shell-like
program you may need to use the shell's quoting syntax to protect
characters such as spaces that have a meaning in the shell syntax.
If you wish to define a function-like macro on the command line,
write its argument list with surrounding parentheses before the
equals sign (if any). Parentheses are meaningful to most shells,
so you will need to quote the option. With 'sh' and 'csh',
'-D'NAME(ARGS...)=DEFINITION'' works.
'-D' and '-U' options are processed in the order they are given on
the command line. All '-imacros FILE' and '-include FILE' options
are processed after all '-D' and '-U' options.
'-U NAME'
Cancel any previous definition of NAME, either built in or provided
with a '-D' option.
'-undef'
Do not predefine any system-specific or GCC-specific macros. The
standard predefined macros remain defined.
'-I DIR'
Add the directory DIR to the list of directories to be searched for
header files. Directories named by '-I' are searched before the
standard system include directories. If the directory DIR is a
standard system include directory, the option is ignored to ensure
that the default search order for system directories and the
special treatment of system headers are not defeated . If DIR
begins with '=', then the '=' will be replaced by the sysroot
prefix; see '--sysroot' and '-isysroot'.
'-o FILE'
Write output to FILE. This is the same as specifying FILE as the
second non-option argument to 'cpp'. 'gcc' has a different
interpretation of a second non-option argument, so you must use
'-o' to specify the output file.
'-Wall'
Turns on all optional warnings which are desirable for normal code.
At present this is '-Wcomment', '-Wtrigraphs', '-Wmultichar' and a
warning about integer promotion causing a change of sign in '#if'
expressions. Note that many of the preprocessor's warnings are on
by default and have no options to control them.
'-Wcomment'
'-Wcomments'
Warn whenever a comment-start sequence '/*' appears in a '/*'
comment, or whenever a backslash-newline appears in a '//' comment.
(Both forms have the same effect.)
'-Wtrigraphs'
Most trigraphs in comments cannot affect the meaning of the
program. However, a trigraph that would form an escaped newline
('??/' at the end of a line) can, by changing where the comment
begins or ends. Therefore, only trigraphs that would form escaped
newlines produce warnings inside a comment.
This option is implied by '-Wall'. If '-Wall' is not given, this
option is still enabled unless trigraphs are enabled. To get
trigraph conversion without warnings, but get the other '-Wall'
warnings, use '-trigraphs -Wall -Wno-trigraphs'.
'-Wtraditional'
Warn about certain constructs that behave differently in
traditional and ISO C. Also warn about ISO C constructs that have
no traditional C equivalent, and problematic constructs which
should be avoided.
'-Wimport'
Warn the first time '#import' is used.
'-Wundef'
Warn whenever an identifier which is not a macro is encountered in
an '#if' directive, outside of 'defined'. Such identifiers are
replaced with zero.
'-Wunused-macros'
Warn about macros defined in the main file that are unused. A
macro is "used" if it is expanded or tested for existence at least
once. The preprocessor will also warn if the macro has not been
used at the time it is redefined or undefined.
Built-in macros, macros defined on the command line, and macros
defined in include files are not warned about.
_Note:_ If a macro is actually used, but only used in skipped
conditional blocks, then CPP will report it as unused. To avoid
the warning in such a case, you might improve the scope of the
macro's definition by, for example, moving it into the first
skipped block. Alternatively, you could provide a dummy use with
something like:
#if defined the_macro_causing_the_warning
#endif
'-Wendif-labels'
Warn whenever an '#else' or an '#endif' are followed by text. This
usually happens in code of the form
#if FOO
...
#else FOO
...
#endif FOO
The second and third 'FOO' should be in comments, but often are not
in older programs. This warning is on by default.
'-Werror'
Make all warnings into hard errors. Source code which triggers
warnings will be rejected.
'-Wsystem-headers'
Issue warnings for code in system headers. These are normally
unhelpful in finding bugs in your own code, therefore suppressed.
If you are responsible for the system library, you may want to see
them.
'-w'
Suppress all warnings, including those which GNU CPP issues by
default.
'-pedantic'
Issue all the mandatory diagnostics listed in the C standard. Some
of them are left out by default, since they trigger frequently on
harmless code.
'-pedantic-errors'
Issue all the mandatory diagnostics, and make all mandatory
diagnostics into errors. This includes mandatory diagnostics that
GCC issues without '-pedantic' but treats as warnings.
'-M'
Instead of outputting the result of preprocessing, output a rule
suitable for 'make' describing the dependencies of the main source
file. The preprocessor outputs one 'make' rule containing the
object file name for that source file, a colon, and the names of
all the included files, including those coming from '-include' or
'-imacros' command line options.
Unless specified explicitly (with '-MT' or '-MQ'), the object file
name consists of the name of the source file with any suffix
replaced with object file suffix and with any leading directory
parts removed. If there are many included files then the rule is
split into several lines using '\'-newline. The rule has no
commands.
This option does not suppress the preprocessor's debug output, such
as '-dM'. To avoid mixing such debug output with the dependency
rules you should explicitly specify the dependency output file with
'-MF', or use an environment variable like 'DEPENDENCIES_OUTPUT'
(*note Environment Variables::). Debug output will still be sent
to the regular output stream as normal.
Passing '-M' to the driver implies '-E', and suppresses warnings
with an implicit '-w'.
'-MM'
Like '-M' but do not mention header files that are found in system
header directories, nor header files that are included, directly or
indirectly, from such a header.
This implies that the choice of angle brackets or double quotes in
an '#include' directive does not in itself determine whether that
header will appear in '-MM' dependency output. This is a slight
change in semantics from GCC versions 3.0 and earlier.
'-MF FILE'
When used with '-M' or '-MM', specifies a file to write the
dependencies to. If no '-MF' switch is given the preprocessor
sends the rules to the same place it would have sent preprocessed
output.
When used with the driver options '-MD' or '-MMD', '-MF' overrides
the default dependency output file.
'-MG'
In conjunction with an option such as '-M' requesting dependency
generation, '-MG' assumes missing header files are generated files
and adds them to the dependency list without raising an error. The
dependency filename is taken directly from the '#include' directive
without prepending any path. '-MG' also suppresses preprocessed
output, as a missing header file renders this useless.
This feature is used in automatic updating of makefiles.
'-MP'
This option instructs CPP to add a phony target for each dependency
other than the main file, causing each to depend on nothing. These
dummy rules work around errors 'make' gives if you remove header
files without updating the 'Makefile' to match.
This is typical output:
test.o: test.c test.h
test.h:
'-MT TARGET'
Change the target of the rule emitted by dependency generation. By
default CPP takes the name of the main input file, deletes any
directory components and any file suffix such as '.c', and appends
the platform's usual object suffix. The result is the target.
An '-MT' option will set the target to be exactly the string you
specify. If you want multiple targets, you can specify them as a
single argument to '-MT', or use multiple '-MT' options.
For example, '-MT '$(objpfx)foo.o'' might give
$(objpfx)foo.o: foo.c
'-MQ TARGET'
Same as '-MT', but it quotes any characters which are special to
Make. '-MQ '$(objpfx)foo.o'' gives
$$(objpfx)foo.o: foo.c
The default target is automatically quoted, as if it were given
with '-MQ'.
'-MD'
'-MD' is equivalent to '-M -MF FILE', except that '-E' is not
implied. The driver determines FILE based on whether an '-o'
option is given. If it is, the driver uses its argument but with a
suffix of '.d', otherwise it takes the name of the input file,
removes any directory components and suffix, and applies a '.d'
suffix.
If '-MD' is used in conjunction with '-E', any '-o' switch is
understood to specify the dependency output file (*note -MF:
dashMF.), but if used without '-E', each '-o' is understood to
specify a target object file.
Since '-E' is not implied, '-MD' can be used to generate a
dependency output file as a side-effect of the compilation process.
'-MMD'
Like '-MD' except mention only user header files, not system header
files.
'-fpch-deps'
When using precompiled headers (*note Precompiled Headers::), this
flag will cause the dependency-output flags to also list the files
from the precompiled header's dependencies. If not specified only
the precompiled header would be listed and not the files that were
used to create it because those files are not consulted when a
precompiled header is used.
'-fpch-preprocess'
This option allows use of a precompiled header (*note Precompiled
Headers::) together with '-E'. It inserts a special '#pragma',
'#pragma GCC pch_preprocess "<filename>"' in the output to mark the
place where the precompiled header was found, and its filename.
When '-fpreprocessed' is in use, GCC recognizes this '#pragma' and
loads the PCH.
This option is off by default, because the resulting preprocessed
output is only really suitable as input to GCC. It is switched on
by '-save-temps'.
You should not write this '#pragma' in your own code, but it is
safe to edit the filename if the PCH file is available in a
different location. The filename may be absolute or it may be
relative to GCC's current directory.
'-x c'
'-x c++'
'-x objective-c'
'-x assembler-with-cpp'
Specify the source language: C, C++, Objective-C, or assembly.
This has nothing to do with standards conformance or extensions; it
merely selects which base syntax to expect. If you give none of
these options, cpp will deduce the language from the extension of
the source file: '.c', '.cc', '.m', or '.S'. Some other common
extensions for C++ and assembly are also recognized. If cpp does
not recognize the extension, it will treat the file as C; this is
the most generic mode.
_Note:_ Previous versions of cpp accepted a '-lang' option which
selected both the language and the standards conformance level.
This option has been removed, because it conflicts with the '-l'
option.
'-std=STANDARD'
'-ansi'
Specify the standard to which the code should conform. Currently
CPP knows about C and C++ standards; others may be added in the
future.
STANDARD may be one of:
'iso9899:1990'
'c89'
The ISO C standard from 1990. 'c89' is the customary
shorthand for this version of the standard.
The '-ansi' option is equivalent to '-std=c89'.
'iso9899:199409'
The 1990 C standard, as amended in 1994.
'iso9899:1999'
'c99'
'iso9899:199x'
'c9x'
The revised ISO C standard, published in December 1999.
Before publication, this was known as C9X.
'gnu89'
The 1990 C standard plus GNU extensions. This is the default.
'gnu99'
'gnu9x'
The 1999 C standard plus GNU extensions.
'c++98'
The 1998 ISO C++ standard plus amendments.
'gnu++98'
The same as '-std=c++98' plus GNU extensions. This is the
default for C++ code.
'-I-'
Split the include path. Any directories specified with '-I'
options before '-I-' are searched only for headers requested with
'#include "FILE"'; they are not searched for '#include <FILE>'. If
additional directories are specified with '-I' options after the
'-I-', those directories are searched for all '#include'
directives.
In addition, '-I-' inhibits the use of the directory of the current
file directory as the first search directory for '#include "FILE"'.
This option has been deprecated.
'-nostdinc'
Do not search the standard system directories for header files.
Only the directories you have specified with '-I' options (and the
directory of the current file, if appropriate) are searched.
'-nostdinc++'
Do not search for header files in the C++-specific standard
directories, but do still search the other standard directories.
(This option is used when building the C++ library.)
'-include FILE'
Process FILE as if '#include "file"' appeared as the first line of
the primary source file. However, the first directory searched for
FILE is the preprocessor's working directory _instead of_ the
directory containing the main source file. If not found there, it
is searched for in the remainder of the '#include "..."' search
chain as normal.
If multiple '-include' options are given, the files are included in
the order they appear on the command line.
'-imacros FILE'
Exactly like '-include', except that any output produced by
scanning FILE is thrown away. Macros it defines remain defined.
This allows you to acquire all the macros from a header without
also processing its declarations.
All files specified by '-imacros' are processed before all files
specified by '-include'.
'-idirafter DIR'
Search DIR for header files, but do it _after_ all directories
specified with '-I' and the standard system directories have been
exhausted. DIR is treated as a system include directory. If DIR
begins with '=', then the '=' will be replaced by the sysroot
prefix; see '--sysroot' and '-isysroot'.
'-iprefix PREFIX'
Specify PREFIX as the prefix for subsequent '-iwithprefix' options.
If the prefix represents a directory, you should include the final
'/'.
'-iwithprefix DIR'
'-iwithprefixbefore DIR'
Append DIR to the prefix specified previously with '-iprefix', and
add the resulting directory to the include search path.
'-iwithprefixbefore' puts it in the same place '-I' would;
'-iwithprefix' puts it where '-idirafter' would.
'-isysroot DIR'
This option is like the '--sysroot' option, but applies only to
header files. See the '--sysroot' option for more information.
'-imultilib DIR'
Use DIR as a subdirectory of the directory containing
target-specific C++ headers.
'-isystem DIR'
Search DIR for header files, after all directories specified by
'-I' but before the standard system directories. Mark it as a
system directory, so that it gets the same special treatment as is
applied to the standard system directories. If DIR begins with
'=', then the '=' will be replaced by the sysroot prefix; see
'--sysroot' and '-isysroot'.
'-iquote DIR'
Search DIR only for header files requested with '#include "FILE"';
they are not searched for '#include <FILE>', before all directories
specified by '-I' and before the standard system directories. If
DIR begins with '=', then the '=' will be replaced by the sysroot
prefix; see '--sysroot' and '-isysroot'.
'-fdirectives-only'
When preprocessing, handle directives, but do not expand macros.
The option's behavior depends on the '-E' and '-fpreprocessed'
options.
With '-E', preprocessing is limited to the handling of directives
such as '#define', '#ifdef', and '#error'. Other preprocessor
operations, such as macro expansion and trigraph conversion are not
performed. In addition, the '-dD' option is implicitly enabled.
With '-fpreprocessed', predefinition of command line and most
builtin macros is disabled. Macros such as '__LINE__', which are
contextually dependent, are handled normally. This enables
compilation of files previously preprocessed with '-E
-fdirectives-only'.
With both '-E' and '-fpreprocessed', the rules for '-fpreprocessed'
take precedence. This enables full preprocessing of files
previously preprocessed with '-E -fdirectives-only'.
'-fdollars-in-identifiers'
Accept '$' in identifiers.
'-fextended-identifiers'
Accept universal character names in identifiers. This option is
experimental; in a future version of GCC, it will be enabled by
default for C99 and C++.
'-fpreprocessed'
Indicate to the preprocessor that the input file has already been
preprocessed. This suppresses things like macro expansion,
trigraph conversion, escaped newline splicing, and processing of
most directives. The preprocessor still recognizes and removes
comments, so that you can pass a file preprocessed with '-C' to the
compiler without problems. In this mode the integrated
preprocessor is little more than a tokenizer for the front ends.
'-fpreprocessed' is implicit if the input file has one of the
extensions '.i', '.ii' or '.mi'. These are the extensions that GCC
uses for preprocessed files created by '-save-temps'.
'-ftabstop=WIDTH'
Set the distance between tab stops. This helps the preprocessor
report correct column numbers in warnings or errors, even if tabs
appear on the line. If the value is less than 1 or greater than
100, the option is ignored. The default is 8.
'-fexec-charset=CHARSET'
Set the execution character set, used for string and character
constants. The default is UTF-8. CHARSET can be any encoding
supported by the system's 'iconv' library routine.
'-fwide-exec-charset=CHARSET'
Set the wide execution character set, used for wide string and
character constants. The default is UTF-32 or UTF-16, whichever
corresponds to the width of 'wchar_t'. As with '-fexec-charset',
CHARSET can be any encoding supported by the system's 'iconv'
library routine; however, you will have problems with encodings
that do not fit exactly in 'wchar_t'.
'-finput-charset=CHARSET'
Set the input character set, used for translation from the
character set of the input file to the source character set used by
GCC. If the locale does not specify, or GCC cannot get this
information from the locale, the default is UTF-8. This can be
overridden by either the locale or this command line option.
Currently the command line option takes precedence if there's a
conflict. CHARSET can be any encoding supported by the system's
'iconv' library routine.
'-fworking-directory'
Enable generation of linemarkers in the preprocessor output that
will let the compiler know the current working directory at the
time of preprocessing. When this option is enabled, the
preprocessor will emit, after the initial linemarker, a second
linemarker with the current working directory followed by two
slashes. GCC will use this directory, when it's present in the
preprocessed input, as the directory emitted as the current working
directory in some debugging information formats. This option is
implicitly enabled if debugging information is enabled, but this
can be inhibited with the negated form '-fno-working-directory'.
If the '-P' flag is present in the command line, this option has no
effect, since no '#line' directives are emitted whatsoever.
'-fno-show-column'
Do not print column numbers in diagnostics. This may be necessary
if diagnostics are being scanned by a program that does not
understand the column numbers, such as 'dejagnu'.
'-A PREDICATE=ANSWER'
Make an assertion with the predicate PREDICATE and answer ANSWER.
This form is preferred to the older form '-A PREDICATE(ANSWER)',
which is still supported, because it does not use shell special
characters.
'-A -PREDICATE=ANSWER'
Cancel an assertion with the predicate PREDICATE and answer ANSWER.
'-dCHARS'
CHARS is a sequence of one or more of the following characters, and
must not be preceded by a space. Other characters are interpreted
by the compiler proper, or reserved for future versions of GCC, and
so are silently ignored. If you specify characters whose behavior
conflicts, the result is undefined.
'M'
Instead of the normal output, generate a list of '#define'
directives for all the macros defined during the execution of
the preprocessor, including predefined macros. This gives you
a way of finding out what is predefined in your version of the
preprocessor. Assuming you have no file 'foo.h', the command
touch foo.h; cpp -dM foo.h
will show all the predefined macros.
If you use '-dM' without the '-E' option, '-dM' is interpreted
as a synonym for '-fdump-rtl-mach'. *Note (gcc)Debugging
Options::.
'D'
Like 'M' except in two respects: it does _not_ include the
predefined macros, and it outputs _both_ the '#define'
directives and the result of preprocessing. Both kinds of
output go to the standard output file.
'N'
Like 'D', but emit only the macro names, not their expansions.
'I'
Output '#include' directives in addition to the result of
preprocessing.
'-P'
Inhibit generation of linemarkers in the output from the
preprocessor. This might be useful when running the preprocessor
on something that is not C code, and will be sent to a program
which might be confused by the linemarkers.
'-C'
Do not discard comments. All comments are passed through to the
output file, except for comments in processed directives, which are
deleted along with the directive.
You should be prepared for side effects when using '-C'; it causes
the preprocessor to treat comments as tokens in their own right.
For example, comments appearing at the start of what would be a
directive line have the effect of turning that line into an
ordinary source line, since the first token on the line is no
longer a '#'.
'-CC'
Do not discard comments, including during macro expansion. This is
like '-C', except that comments contained within macros are also
passed through to the output file where the macro is expanded.
In addition to the side-effects of the '-C' option, the '-CC'
option causes all C++-style comments inside a macro to be converted
to C-style comments. This is to prevent later use of that macro
from inadvertently commenting out the remainder of the source line.
The '-CC' option is generally used to support lint comments.
'-traditional-cpp'
Try to imitate the behavior of old-fashioned C preprocessors, as
opposed to ISO C preprocessors.
'-trigraphs'
Process trigraph sequences. These are three-character sequences,
all starting with '??', that are defined by ISO C to stand for
single characters. For example, '??/' stands for '\', so ''??/n''
is a character constant for a newline. By default, GCC ignores
trigraphs, but in standard-conforming modes it converts them. See
the '-std' and '-ansi' options.
The nine trigraphs and their replacements are
Trigraph: ??( ??) ??< ??> ??= ??/ ??' ??! ??-
Replacement: [ ] { } # \ ^ | ~
'-remap'
Enable special code to work around file systems which only permit
very short file names, such as MS-DOS.
'--help'
'--help'
'--target-help'
Print text describing all the command line options instead of
preprocessing anything.
'-v'
Verbose mode. Print out GNU CPP's version number at the beginning
of execution, and report the final form of the include path.
'-H'
Print the name of each header file used, in addition to other
normal activities. Each name is indented to show how deep in the
'#include' stack it is. Precompiled header files are also printed,
even if they are found to be invalid; an invalid precompiled header
file is printed with '...x' and a valid one with '...!' .
'-version'
'--version'
Print out GNU CPP's version number. With one dash, proceed to
preprocess as normal. With two dashes, exit immediately.

File: gcc.info, Node: Assembler Options, Next: Link Options, Prev: Preprocessor Options, Up: Invoking GCC
3.12 Passing Options to the Assembler
=====================================
You can pass options to the assembler.
'-Wa,OPTION'
Pass OPTION as an option to the assembler. If OPTION contains
commas, it is split into multiple options at the commas.
'-Xassembler OPTION'
Pass OPTION as an option to the assembler. You can use this to
supply system-specific assembler options which GCC does not know
how to recognize.
If you want to pass an option that takes an argument, you must use
'-Xassembler' twice, once for the option and once for the argument.

File: gcc.info, Node: Link Options, Next: Directory Options, Prev: Assembler Options, Up: Invoking GCC
3.13 Options for Linking
========================
These options come into play when the compiler links object files into
an executable output file. They are meaningless if the compiler is not
doing a link step.
'OBJECT-FILE-NAME'
A file name that does not end in a special recognized suffix is
considered to name an object file or library. (Object files are
distinguished from libraries by the linker according to the file
contents.) If linking is done, these object files are used as
input to the linker.
'-c'
'-S'
'-E'
If any of these options is used, then the linker is not run, and
object file names should not be used as arguments. *Note Overall
Options::.
'-lLIBRARY'
'-l LIBRARY'
Search the library named LIBRARY when linking. (The second
alternative with the library as a separate argument is only for
POSIX compliance and is not recommended.)
It makes a difference where in the command you write this option;
the linker searches and processes libraries and object files in the
order they are specified. Thus, 'foo.o -lz bar.o' searches library
'z' after file 'foo.o' but before 'bar.o'. If 'bar.o' refers to
functions in 'z', those functions may not be loaded.
The linker searches a standard list of directories for the library,
which is actually a file named 'libLIBRARY.a'. The linker then
uses this file as if it had been specified precisely by name.
The directories searched include several standard system
directories plus any that you specify with '-L'.
Normally the files found this way are library files--archive files
whose members are object files. The linker handles an archive file
by scanning through it for members which define symbols that have
so far been referenced but not defined. But if the file that is
found is an ordinary object file, it is linked in the usual
fashion. The only difference between using an '-l' option and
specifying a file name is that '-l' surrounds LIBRARY with 'lib'
and '.a' and searches several directories.
'-lobjc'
You need this special case of the '-l' option in order to link an
Objective-C or Objective-C++ program.
'-nostartfiles'
Do not use the standard system startup files when linking. The
standard system libraries are used normally, unless '-nostdlib' or
'-nodefaultlibs' is used.
'-nodefaultlibs'
Do not use the standard system libraries when linking. Only the
libraries you specify will be passed to the linker. The standard
startup files are used normally, unless '-nostartfiles' is used.
The compiler may generate calls to 'memcmp', 'memset', 'memcpy' and
'memmove'. These entries are usually resolved by entries in libc.
These entry points should be supplied through some other mechanism
when this option is specified.
'-nostdlib'
Do not use the standard system startup files or libraries when
linking. No startup files and only the libraries you specify will
be passed to the linker. The compiler may generate calls to
'memcmp', 'memset', 'memcpy' and 'memmove'. These entries are
usually resolved by entries in libc. These entry points should be
supplied through some other mechanism when this option is
specified.
One of the standard libraries bypassed by '-nostdlib' and
'-nodefaultlibs' is 'libgcc.a', a library of internal subroutines
that GCC uses to overcome shortcomings of particular machines, or
special needs for some languages. (*Note Interfacing to GCC
Output: (gccint)Interface, for more discussion of 'libgcc.a'.) In
most cases, you need 'libgcc.a' even when you want to avoid other
standard libraries. In other words, when you specify '-nostdlib'
or '-nodefaultlibs' you should usually specify '-lgcc' as well.
This ensures that you have no unresolved references to internal GCC
library subroutines. (For example, '__main', used to ensure C++
constructors will be called; *note 'collect2': (gccint)Collect2.)
'-pie'
Produce a position independent executable on targets which support
it. For predictable results, you must also specify the same set of
options that were used to generate code ('-fpie', '-fPIE', or model
suboptions) when you specify this option.
'-rdynamic'
Pass the flag '-export-dynamic' to the ELF linker, on targets that
support it. This instructs the linker to add all symbols, not only
used ones, to the dynamic symbol table. This option is needed for
some uses of 'dlopen' or to allow obtaining backtraces from within
a program.
'-s'
Remove all symbol table and relocation information from the
executable.
'-static'
On systems that support dynamic linking, this prevents linking with
the shared libraries. On other systems, this option has no effect.
'-shared'
Produce a shared object which can then be linked with other objects
to form an executable. Not all systems support this option. For
predictable results, you must also specify the same set of options
that were used to generate code ('-fpic', '-fPIC', or model
suboptions) when you specify this option.(1)
'-shared-libgcc'
'-static-libgcc'
On systems that provide 'libgcc' as a shared library, these options
force the use of either the shared or static version respectively.
If no shared version of 'libgcc' was built when the compiler was
configured, these options have no effect.
There are several situations in which an application should use the
shared 'libgcc' instead of the static version. The most common of
these is when the application wishes to throw and catch exceptions
across different shared libraries. In that case, each of the
libraries as well as the application itself should use the shared
'libgcc'.
Therefore, the G++ and GCJ drivers automatically add
'-shared-libgcc' whenever you build a shared library or a main
executable, because C++ and Java programs typically use exceptions,
so this is the right thing to do.
If, instead, you use the GCC driver to create shared libraries, you
may find that they will not always be linked with the shared
'libgcc'. If GCC finds, at its configuration time, that you have a
non-GNU linker or a GNU linker that does not support option
'--eh-frame-hdr', it will link the shared version of 'libgcc' into
shared libraries by default. Otherwise, it will take advantage of
the linker and optimize away the linking with the shared version of
'libgcc', linking with the static version of libgcc by default.
This allows exceptions to propagate through such shared libraries,
without incurring relocation costs at library load time.
However, if a library or main executable is supposed to throw or
catch exceptions, you must link it using the G++ or GCJ driver, as
appropriate for the languages used in the program, or using the
option '-shared-libgcc', such that it is linked with the shared
'libgcc'.
'-symbolic'
Bind references to global symbols when building a shared object.
Warn about any unresolved references (unless overridden by the link
editor option '-Xlinker -z -Xlinker defs'). Only a few systems
support this option.
'-Xlinker OPTION'
Pass OPTION as an option to the linker. You can use this to supply
system-specific linker options which GCC does not know how to
recognize.
If you want to pass an option that takes an argument, you must use
'-Xlinker' twice, once for the option and once for the argument.
For example, to pass '-assert definitions', you must write
'-Xlinker -assert -Xlinker definitions'. It does not work to write
'-Xlinker "-assert definitions"', because this passes the entire
string as a single argument, which is not what the linker expects.
'-Wl,OPTION'
Pass OPTION as an option to the linker. If OPTION contains commas,
it is split into multiple options at the commas.
'-u SYMBOL'
Pretend the symbol SYMBOL is undefined, to force linking of library
modules to define it. You can use '-u' multiple times with
different symbols to force loading of additional library modules.
---------- Footnotes ----------
(1) On some systems, 'gcc -shared' needs to build supplementary stub
code for constructors to work. On multi-libbed systems, 'gcc -shared'
must select the correct support libraries to link against. Failing to
supply the correct flags may lead to subtle defects. Supplying them in
cases where they are not necessary is innocuous.

File: gcc.info, Node: Directory Options, Next: Spec Files, Prev: Link Options, Up: Invoking GCC
3.14 Options for Directory Search
=================================
These options specify directories to search for header files, for
libraries and for parts of the compiler:
'-IDIR'
Add the directory DIR to the head of the list of directories to be
searched for header files. This can be used to override a system
header file, substituting your own version, since these directories
are searched before the system header file directories. However,
you should not use this option to add directories that contain
vendor-supplied system header files (use '-isystem' for that). If
you use more than one '-I' option, the directories are scanned in
left-to-right order; the standard system directories come after.
If a standard system include directory, or a directory specified
with '-isystem', is also specified with '-I', the '-I' option will
be ignored. The directory will still be searched but as a system
directory at its normal position in the system include chain. This
is to ensure that GCC's procedure to fix buggy system headers and
the ordering for the include_next directive are not inadvertently
changed. If you really need to change the search order for system
directories, use the '-nostdinc' and/or '-isystem' options.
'-iquoteDIR'
Add the directory DIR to the head of the list of directories to be
searched for header files only for the case of '#include "FILE"';
they are not searched for '#include <FILE>', otherwise just like
'-I'.
'-LDIR'
Add directory DIR to the list of directories to be searched for
'-l'.
'-BPREFIX'
This option specifies where to find the executables, libraries,
include files, and data files of the compiler itself.
The compiler driver program runs one or more of the subprograms
'cpp', 'cc1', 'as' and 'ld'. It tries PREFIX as a prefix for each
program it tries to run, both with and without 'MACHINE/VERSION/'
(*note Target Options::).
For each subprogram to be run, the compiler driver first tries the
'-B' prefix, if any. If that name is not found, or if '-B' was not
specified, the driver tries two standard prefixes, which are
'/usr/lib/gcc/' and '/usr/local/lib/gcc/'. If neither of those
results in a file name that is found, the unmodified program name
is searched for using the directories specified in your 'PATH'
environment variable.
The compiler will check to see if the path provided by the '-B'
refers to a directory, and if necessary it will add a directory
separator character at the end of the path.
'-B' prefixes that effectively specify directory names also apply
to libraries in the linker, because the compiler translates these
options into '-L' options for the linker. They also apply to
includes files in the preprocessor, because the compiler translates
these options into '-isystem' options for the preprocessor. In
this case, the compiler appends 'include' to the prefix.
The run-time support file 'libgcc.a' can also be searched for using
the '-B' prefix, if needed. If it is not found there, the two
standard prefixes above are tried, and that is all. The file is
left out of the link if it is not found by those means.
Another way to specify a prefix much like the '-B' prefix is to use
the environment variable 'GCC_EXEC_PREFIX'. *Note Environment
Variables::.
As a special kludge, if the path provided by '-B' is
'[dir/]stageN/', where N is a number in the range 0 to 9, then it
will be replaced by '[dir/]include'. This is to help with
boot-strapping the compiler.
'-specs=FILE'
Process FILE after the compiler reads in the standard 'specs' file,
in order to override the defaults that the 'gcc' driver program
uses when determining what switches to pass to 'cc1', 'cc1plus',
'as', 'ld', etc. More than one '-specs=FILE' can be specified on
the command line, and they are processed in order, from left to
right.
'--sysroot=DIR'
Use DIR as the logical root directory for headers and libraries.
For example, if the compiler would normally search for headers in
'/usr/include' and libraries in '/usr/lib', it will instead search
'DIR/usr/include' and 'DIR/usr/lib'.
If you use both this option and the '-isysroot' option, then the
'--sysroot' option will apply to libraries, but the '-isysroot'
option will apply to header files.
The GNU linker (beginning with version 2.16) has the necessary
support for this option. If your linker does not support this
option, the header file aspect of '--sysroot' will still work, but
the library aspect will not.
'-I-'
This option has been deprecated. Please use '-iquote' instead for
'-I' directories before the '-I-' and remove the '-I-'. Any
directories you specify with '-I' options before the '-I-' option
are searched only for the case of '#include "FILE"'; they are not
searched for '#include <FILE>'.
If additional directories are specified with '-I' options after the
'-I-', these directories are searched for all '#include'
directives. (Ordinarily _all_ '-I' directories are used this way.)
In addition, the '-I-' option inhibits the use of the current
directory (where the current input file came from) as the first
search directory for '#include "FILE"'. There is no way to
override this effect of '-I-'. With '-I.' you can specify
searching the directory which was current when the compiler was
invoked. That is not exactly the same as what the preprocessor
does by default, but it is often satisfactory.
'-I-' does not inhibit the use of the standard system directories
for header files. Thus, '-I-' and '-nostdinc' are independent.

File: gcc.info, Node: Spec Files, Next: Target Options, Prev: Directory Options, Up: Invoking GCC
3.15 Specifying subprocesses and the switches to pass to them
=============================================================
'gcc' is a driver program. It performs its job by invoking a sequence
of other programs to do the work of compiling, assembling and linking.
GCC interprets its command-line parameters and uses these to deduce
which programs it should invoke, and which command-line options it ought
to place on their command lines. This behavior is controlled by "spec
strings". In most cases there is one spec string for each program that
GCC can invoke, but a few programs have multiple spec strings to control
their behavior. The spec strings built into GCC can be overridden by
using the '-specs=' command-line switch to specify a spec file.
"Spec files" are plaintext files that are used to construct spec
strings. They consist of a sequence of directives separated by blank
lines. The type of directive is determined by the first non-whitespace
character on the line and it can be one of the following:
'%COMMAND'
Issues a COMMAND to the spec file processor. The commands that can
appear here are:
'%include <FILE>'
Search for FILE and insert its text at the current point in
the specs file.
'%include_noerr <FILE>'
Just like '%include', but do not generate an error message if
the include file cannot be found.
'%rename OLD_NAME NEW_NAME'
Rename the spec string OLD_NAME to NEW_NAME.
'*[SPEC_NAME]:'
This tells the compiler to create, override or delete the named
spec string. All lines after this directive up to the next
directive or blank line are considered to be the text for the spec
string. If this results in an empty string then the spec will be
deleted. (Or, if the spec did not exist, then nothing will
happened.) Otherwise, if the spec does not currently exist a new
spec will be created. If the spec does exist then its contents
will be overridden by the text of this directive, unless the first
character of that text is the '+' character, in which case the text
will be appended to the spec.
'[SUFFIX]:'
Creates a new '[SUFFIX] spec' pair. All lines after this directive
and up to the next directive or blank line are considered to make
up the spec string for the indicated suffix. When the compiler
encounters an input file with the named suffix, it will processes
the spec string in order to work out how to compile that file. For
example:
.ZZ:
z-compile -input %i
This says that any input file whose name ends in '.ZZ' should be
passed to the program 'z-compile', which should be invoked with the
command-line switch '-input' and with the result of performing the
'%i' substitution. (See below.)
As an alternative to providing a spec string, the text that follows
a suffix directive can be one of the following:
'@LANGUAGE'
This says that the suffix is an alias for a known LANGUAGE.
This is similar to using the '-x' command-line switch to GCC
to specify a language explicitly. For example:
.ZZ:
@c++
Says that .ZZ files are, in fact, C++ source files.
'#NAME'
This causes an error messages saying:
NAME compiler not installed on this system.
GCC already has an extensive list of suffixes built into it. This
directive will add an entry to the end of the list of suffixes, but
since the list is searched from the end backwards, it is
effectively possible to override earlier entries using this
technique.
GCC has the following spec strings built into it. Spec files can
override these strings or create their own. Note that individual
targets can also add their own spec strings to this list.
asm Options to pass to the assembler
asm_final Options to pass to the assembler post-processor
cpp Options to pass to the C preprocessor
cc1 Options to pass to the C compiler
cc1plus Options to pass to the C++ compiler
endfile Object files to include at the end of the link
link Options to pass to the linker
lib Libraries to include on the command line to the linker
libgcc Decides which GCC support library to pass to the linker
linker Sets the name of the linker
predefines Defines to be passed to the C preprocessor
signed_char Defines to pass to CPP to say whether char is signed
by default
startfile Object files to include at the start of the link
Here is a small example of a spec file:
%rename lib old_lib
*lib:
--start-group -lgcc -lc -leval1 --end-group %(old_lib)
This example renames the spec called 'lib' to 'old_lib' and then
overrides the previous definition of 'lib' with a new one. The new
definition adds in some extra command-line options before including the
text of the old definition.
"Spec strings" are a list of command-line options to be passed to their
corresponding program. In addition, the spec strings can contain
'%'-prefixed sequences to substitute variable text or to conditionally
insert text into the command line. Using these constructs it is
possible to generate quite complex command lines.
Here is a table of all defined '%'-sequences for spec strings. Note
that spaces are not generated automatically around the results of
expanding these sequences. Therefore you can concatenate them together
or combine them with constant text in a single argument.
'%%'
Substitute one '%' into the program name or argument.
'%i'
Substitute the name of the input file being processed.
'%b'
Substitute the basename of the input file being processed. This is
the substring up to (and not including) the last period and not
including the directory.
'%B'
This is the same as '%b', but include the file suffix (text after
the last period).
'%d'
Marks the argument containing or following the '%d' as a temporary
file name, so that that file will be deleted if GCC exits
successfully. Unlike '%g', this contributes no text to the
argument.
'%gSUFFIX'
Substitute a file name that has suffix SUFFIX and is chosen once
per compilation, and mark the argument in the same way as '%d'. To
reduce exposure to denial-of-service attacks, the file name is now
chosen in a way that is hard to predict even when previously chosen
file names are known. For example, '%g.s ... %g.o ... %g.s' might
turn into 'ccUVUUAU.s ccXYAXZ12.o ccUVUUAU.s'. SUFFIX matches the
regexp '[.A-Za-z]*' or the special string '%O', which is treated
exactly as if '%O' had been preprocessed. Previously, '%g' was
simply substituted with a file name chosen once per compilation,
without regard to any appended suffix (which was therefore treated
just like ordinary text), making such attacks more likely to
succeed.
'%uSUFFIX'
Like '%g', but generates a new temporary file name even if
'%uSUFFIX' was already seen.
'%USUFFIX'
Substitutes the last file name generated with '%uSUFFIX',
generating a new one if there is no such last file name. In the
absence of any '%uSUFFIX', this is just like '%gSUFFIX', except
they don't share the same suffix _space_, so '%g.s ... %U.s ...
%g.s ... %U.s' would involve the generation of two distinct file
names, one for each '%g.s' and another for each '%U.s'.
Previously, '%U' was simply substituted with a file name chosen for
the previous '%u', without regard to any appended suffix.
'%jSUFFIX'
Substitutes the name of the 'HOST_BIT_BUCKET', if any, and if it is
writable, and if save-temps is off; otherwise, substitute the name
of a temporary file, just like '%u'. This temporary file is not
meant for communication between processes, but rather as a junk
disposal mechanism.
'%|SUFFIX'
'%mSUFFIX'
Like '%g', except if '-pipe' is in effect. In that case '%|'
substitutes a single dash and '%m' substitutes nothing at all.
These are the two most common ways to instruct a program that it
should read from standard input or write to standard output. If
you need something more elaborate you can use an '%{pipe:'X'}'
construct: see for example 'f/lang-specs.h'.
'%.SUFFIX'
Substitutes .SUFFIX for the suffixes of a matched switch's args
when it is subsequently output with '%*'. SUFFIX is terminated by
the next space or %.
'%w'
Marks the argument containing or following the '%w' as the
designated output file of this compilation. This puts the argument
into the sequence of arguments that '%o' will substitute later.
'%o'
Substitutes the names of all the output files, with spaces
automatically placed around them. You should write spaces around
the '%o' as well or the results are undefined. '%o' is for use in
the specs for running the linker. Input files whose names have no
recognized suffix are not compiled at all, but they are included
among the output files, so they will be linked.
'%O'
Substitutes the suffix for object files. Note that this is handled
specially when it immediately follows '%g, %u, or %U', because of
the need for those to form complete file names. The handling is
such that '%O' is treated exactly as if it had already been
substituted, except that '%g, %u, and %U' do not currently support
additional SUFFIX characters following '%O' as they would
following, for example, '.o'.
'%p'
Substitutes the standard macro predefinitions for the current
target machine. Use this when running 'cpp'.
'%P'
Like '%p', but puts '__' before and after the name of each
predefined macro, except for macros that start with '__' or with
'_L', where L is an uppercase letter. This is for ISO C.
'%I'
Substitute any of '-iprefix' (made from 'GCC_EXEC_PREFIX'),
'-isysroot' (made from 'TARGET_SYSTEM_ROOT'), '-isystem' (made from
'COMPILER_PATH' and '-B' options) and '-imultilib' as necessary.
'%s'
Current argument is the name of a library or startup file of some
sort. Search for that file in a standard list of directories and
substitute the full name found.
'%eSTR'
Print STR as an error message. STR is terminated by a newline.
Use this when inconsistent options are detected.
'%(NAME)'
Substitute the contents of spec string NAME at this point.
'%[NAME]'
Like '%(...)' but put '__' around '-D' arguments.
'%x{OPTION}'
Accumulate an option for '%X'.
'%X'
Output the accumulated linker options specified by '-Wl' or a '%x'
spec string.
'%Y'
Output the accumulated assembler options specified by '-Wa'.
'%Z'
Output the accumulated preprocessor options specified by '-Wp'.
'%a'
Process the 'asm' spec. This is used to compute the switches to be
passed to the assembler.
'%A'
Process the 'asm_final' spec. This is a spec string for passing
switches to an assembler post-processor, if such a program is
needed.
'%l'
Process the 'link' spec. This is the spec for computing the
command line passed to the linker. Typically it will make use of
the '%L %G %S %D and %E' sequences.
'%D'
Dump out a '-L' option for each directory that GCC believes might
contain startup files. If the target supports multilibs then the
current multilib directory will be prepended to each of these
paths.
'%L'
Process the 'lib' spec. This is a spec string for deciding which
libraries should be included on the command line to the linker.
'%G'
Process the 'libgcc' spec. This is a spec string for deciding
which GCC support library should be included on the command line to
the linker.
'%S'
Process the 'startfile' spec. This is a spec for deciding which
object files should be the first ones passed to the linker.
Typically this might be a file named 'crt0.o'.
'%E'
Process the 'endfile' spec. This is a spec string that specifies
the last object files that will be passed to the linker.
'%C'
Process the 'cpp' spec. This is used to construct the arguments to
be passed to the C preprocessor.
'%1'
Process the 'cc1' spec. This is used to construct the options to
be passed to the actual C compiler ('cc1').
'%2'
Process the 'cc1plus' spec. This is used to construct the options
to be passed to the actual C++ compiler ('cc1plus').
'%*'
Substitute the variable part of a matched option. See below. Note
that each comma in the substituted string is replaced by a single
space.
'%<S'
Remove all occurrences of '-S' from the command line. Note--this
command is position dependent. '%' commands in the spec string
before this one will see '-S', '%' commands in the spec string
after this one will not.
'%:FUNCTION(ARGS)'
Call the named function FUNCTION, passing it ARGS. ARGS is first
processed as a nested spec string, then split into an argument
vector in the usual fashion. The function returns a string which
is processed as if it had appeared literally as part of the current
spec.
The following built-in spec functions are provided:
'getenv'
The 'getenv' spec function takes two arguments: an environment
variable name and a string. If the environment variable is
not defined, a fatal error is issued. Otherwise, the return
value is the value of the environment variable concatenated
with the string. For example, if 'TOPDIR' is defined as
'/path/to/top', then:
%:getenv(TOPDIR /include)
expands to '/path/to/top/include'.
'if-exists'
The 'if-exists' spec function takes one argument, an absolute
pathname to a file. If the file exists, 'if-exists' returns
the pathname. Here is a small example of its usage:
*startfile:
crt0%O%s %:if-exists(crti%O%s) crtbegin%O%s
'if-exists-else'
The 'if-exists-else' spec function is similar to the
'if-exists' spec function, except that it takes two arguments.
The first argument is an absolute pathname to a file. If the
file exists, 'if-exists-else' returns the pathname. If it
does not exist, it returns the second argument. This way,
'if-exists-else' can be used to select one file or another,
based on the existence of the first. Here is a small example
of its usage:
*startfile:
crt0%O%s %:if-exists(crti%O%s) \
%:if-exists-else(crtbeginT%O%s crtbegin%O%s)
'replace-outfile'
The 'replace-outfile' spec function takes two arguments. It
looks for the first argument in the outfiles array and
replaces it with the second argument. Here is a small example
of its usage:
%{fgnu-runtime:%:replace-outfile(-lobjc -lobjc-gnu)}
'print-asm-header'
The 'print-asm-header' function takes no arguments and simply
prints a banner like:
Assembler options
=================
Use "-Wa,OPTION" to pass "OPTION" to the assembler.
It is used to separate compiler options from assembler options
in the '--target-help' output.
'%{S}'
Substitutes the '-S' switch, if that switch was given to GCC. If
that switch was not specified, this substitutes nothing. Note that
the leading dash is omitted when specifying this option, and it is
automatically inserted if the substitution is performed. Thus the
spec string '%{foo}' would match the command-line option '-foo' and
would output the command line option '-foo'.
'%W{S}'
Like %{'S'} but mark last argument supplied within as a file to be
deleted on failure.
'%{S*}'
Substitutes all the switches specified to GCC whose names start
with '-S', but which also take an argument. This is used for
switches like '-o', '-D', '-I', etc. GCC considers '-o foo' as
being one switch whose names starts with 'o'. %{o*} would
substitute this text, including the space. Thus two arguments
would be generated.
'%{S*&T*}'
Like %{'S'*}, but preserve order of 'S' and 'T' options (the order
of 'S' and 'T' in the spec is not significant). There can be any
number of ampersand-separated variables; for each the wild card is
optional. Useful for CPP as '%{D*&U*&A*}'.
'%{S:X}'
Substitutes 'X', if the '-S' switch was given to GCC.
'%{!S:X}'
Substitutes 'X', if the '-S' switch was _not_ given to GCC.
'%{S*:X}'
Substitutes 'X' if one or more switches whose names start with '-S'
are specified to GCC. Normally 'X' is substituted only once, no
matter how many such switches appeared. However, if '%*' appears
somewhere in 'X', then 'X' will be substituted once for each
matching switch, with the '%*' replaced by the part of that switch
that matched the '*'.
'%{.S:X}'
Substitutes 'X', if processing a file with suffix 'S'.
'%{!.S:X}'
Substitutes 'X', if _not_ processing a file with suffix 'S'.
'%{,S:X}'
Substitutes 'X', if processing a file for language 'S'.
'%{!,S:X}'
Substitutes 'X', if not processing a file for language 'S'.
'%{S|P:X}'
Substitutes 'X' if either '-S' or '-P' was given to GCC. This may
be combined with '!', '.', ',', and '*' sequences as well, although
they have a stronger binding than the '|'. If '%*' appears in 'X',
all of the alternatives must be starred, and only the first
matching alternative is substituted.
For example, a spec string like this:
%{.c:-foo} %{!.c:-bar} %{.c|d:-baz} %{!.c|d:-boggle}
will output the following command-line options from the following
input command-line options:
fred.c -foo -baz
jim.d -bar -boggle
-d fred.c -foo -baz -boggle
-d jim.d -bar -baz -boggle
'%{S:X; T:Y; :D}'
If 'S' was given to GCC, substitutes 'X'; else if 'T' was given to
GCC, substitutes 'Y'; else substitutes 'D'. There can be as many
clauses as you need. This may be combined with '.', ',', '!', '|',
and '*' as needed.
The conditional text 'X' in a %{'S':'X'} or similar construct may
contain other nested '%' constructs or spaces, or even newlines. They
are processed as usual, as described above. Trailing white space in 'X'
is ignored. White space may also appear anywhere on the left side of
the colon in these constructs, except between '.' or '*' and the
corresponding word.
The '-O', '-f', '-m', and '-W' switches are handled specifically in
these constructs. If another value of '-O' or the negated form of a
'-f', '-m', or '-W' switch is found later in the command line, the
earlier switch value is ignored, except with {'S'*} where 'S' is just
one letter, which passes all matching options.
The character '|' at the beginning of the predicate text is used to
indicate that a command should be piped to the following command, but
only if '-pipe' is specified.
It is built into GCC which switches take arguments and which do not.
(You might think it would be useful to generalize this to allow each
compiler's spec to say which switches take arguments. But this cannot
be done in a consistent fashion. GCC cannot even decide which input
files have been specified without knowing which switches take arguments,
and it must know which input files to compile in order to tell which
compilers to run).
GCC also knows implicitly that arguments starting in '-l' are to be
treated as compiler output files, and passed to the linker in their
proper position among the other output files.

File: gcc.info, Node: Target Options, Next: Submodel Options, Prev: Spec Files, Up: Invoking GCC
3.16 Specifying Target Machine and Compiler Version
===================================================
The usual way to run GCC is to run the executable called 'gcc', or
'<machine>-gcc' when cross-compiling, or '<machine>-gcc-<version>' to
run a version other than the one that was installed last. Sometimes
this is inconvenient, so GCC provides options that will switch to
another cross-compiler or version.
'-b MACHINE'
The argument MACHINE specifies the target machine for compilation.
The value to use for MACHINE is the same as was specified as the
machine type when configuring GCC as a cross-compiler. For
example, if a cross-compiler was configured with 'configure
arm-elf', meaning to compile for an arm processor with elf
binaries, then you would specify '-b arm-elf' to run that cross
compiler. Because there are other options beginning with '-b', the
configuration must contain a hyphen.
'-V VERSION'
The argument VERSION specifies which version of GCC to run. This
is useful when multiple versions are installed. For example,
VERSION might be '4.0', meaning to run GCC version 4.0.
The '-V' and '-b' options work by running the '<machine>-gcc-<version>'
executable, so there's no real reason to use them if you can just run
that directly.

File: gcc.info, Node: Submodel Options, Next: Code Gen Options, Prev: Target Options, Up: Invoking GCC
3.17 Hardware Models and Configurations
=======================================
Earlier we discussed the standard option '-b' which chooses among
different installed compilers for completely different target machines,
such as VAX vs. 68000 vs. 80386.
In addition, each of these target machine types can have its own
special options, starting with '-m', to choose among various hardware
models or configurations--for example, 68010 vs 68020, floating
coprocessor or none. A single installed version of the compiler can
compile for any model or configuration, according to the options
specified.
Some configurations of the compiler also support additional special
options, usually for compatibility with other compilers on the same
platform.
* Menu:
* ARC Options::
* ARM Options::
* AVR Options::
* Blackfin Options::
* CRIS Options::
* CRX Options::
* Darwin Options::
* DEC Alpha Options::
* DEC Alpha/VMS Options::
* FRV Options::
* GNU/Linux Options::
* H8/300 Options::
* HPPA Options::
* i386 and x86-64 Options::
* IA-64 Options::
* M32C Options::
* M32R/D Options::
* M680x0 Options::
* M68hc1x Options::
* MCore Options::
* MIPS Options::
* MMIX Options::
* MN10300 Options::
* MT Options::
* PDP-11 Options::
* PowerPC Options::
* RS/6000 and PowerPC Options::
* S/390 and zSeries Options::
* Score Options::
* SH Options::
* SPARC Options::
* SPU Options::
* System V Options::
* V850 Options::
* VAX Options::
* VxWorks Options::
* x86-64 Options::
* Xstormy16 Options::
* Xtensa Options::
* zSeries Options::

File: gcc.info, Node: ARC Options, Next: ARM Options, Up: Submodel Options
3.17.1 ARC Options
------------------
These options are defined for ARC implementations:
'-EL'
Compile code for little endian mode. This is the default.
'-EB'
Compile code for big endian mode.
'-mmangle-cpu'
Prepend the name of the cpu to all public symbol names. In
multiple-processor systems, there are many ARC variants with
different instruction and register set characteristics. This flag
prevents code compiled for one cpu to be linked with code compiled
for another. No facility exists for handling variants that are
"almost identical". This is an all or nothing option.
'-mcpu=CPU'
Compile code for ARC variant CPU. Which variants are supported
depend on the configuration. All variants support '-mcpu=base',
this is the default.
'-mtext=TEXT-SECTION'
'-mdata=DATA-SECTION'
'-mrodata=READONLY-DATA-SECTION'
Put functions, data, and readonly data in TEXT-SECTION,
DATA-SECTION, and READONLY-DATA-SECTION respectively by default.
This can be overridden with the 'section' attribute. *Note
Variable Attributes::.

File: gcc.info, Node: ARM Options, Next: AVR Options, Prev: ARC Options, Up: Submodel Options
3.17.2 ARM Options
------------------
These '-m' options are defined for Advanced RISC Machines (ARM)
architectures:
'-mabi=NAME'
Generate code for the specified ABI. Permissible values are:
'apcs-gnu', 'atpcs', 'aapcs', 'aapcs-linux' and 'iwmmxt'.
'-mapcs-frame'
Generate a stack frame that is compliant with the ARM Procedure
Call Standard for all functions, even if this is not strictly
necessary for correct execution of the code. Specifying
'-fomit-frame-pointer' with this option will cause the stack frames
not to be generated for leaf functions. The default is
'-mno-apcs-frame'.
'-mapcs'
This is a synonym for '-mapcs-frame'.
'-mthumb-interwork'
Generate code which supports calling between the ARM and Thumb
instruction sets. Without this option the two instruction sets
cannot be reliably used inside one program. The default is
'-mno-thumb-interwork', since slightly larger code is generated
when '-mthumb-interwork' is specified.
'-mno-sched-prolog'
Prevent the reordering of instructions in the function prolog, or
the merging of those instruction with the instructions in the
function's body. This means that all functions will start with a
recognizable set of instructions (or in fact one of a choice from a
small set of different function prologues), and this information
can be used to locate the start if functions inside an executable
piece of code. The default is '-msched-prolog'.
'-mhard-float'
Generate output containing floating point instructions. This is
the default.
'-msoft-float'
Generate output containing library calls for floating point.
*Warning:* the requisite libraries are not available for all ARM
targets. Normally the facilities of the machine's usual C compiler
are used, but this cannot be done directly in cross-compilation.
You must make your own arrangements to provide suitable library
functions for cross-compilation.
'-msoft-float' changes the calling convention in the output file;
therefore, it is only useful if you compile _all_ of a program with
this option. In particular, you need to compile 'libgcc.a', the
library that comes with GCC, with '-msoft-float' in order for this
to work.
'-mfloat-abi=NAME'
Specifies which ABI to use for floating point values. Permissible
values are: 'soft', 'softfp' and 'hard'.
'soft' and 'hard' are equivalent to '-msoft-float' and
'-mhard-float' respectively. 'softfp' allows the generation of
floating point instructions, but still uses the soft-float calling
conventions.
'-mlittle-endian'
Generate code for a processor running in little-endian mode. This
is the default for all standard configurations.
'-mbig-endian'
Generate code for a processor running in big-endian mode; the
default is to compile code for a little-endian processor.
'-mwords-little-endian'
This option only applies when generating code for big-endian
processors. Generate code for a little-endian word order but a
big-endian byte order. That is, a byte order of the form
'32107654'. Note: this option should only be used if you require
compatibility with code for big-endian ARM processors generated by
versions of the compiler prior to 2.8.
'-mcpu=NAME'
This specifies the name of the target ARM processor. GCC uses this
name to determine what kind of instructions it can emit when
generating assembly code. Permissible names are: 'arm2', 'arm250',
'arm3', 'arm6', 'arm60', 'arm600', 'arm610', 'arm620', 'arm7',
'arm7m', 'arm7d', 'arm7dm', 'arm7di', 'arm7dmi', 'arm70', 'arm700',
'arm700i', 'arm710', 'arm710c', 'arm7100', 'arm7500', 'arm7500fe',
'arm7tdmi', 'arm7tdmi-s', 'arm8', 'strongarm', 'strongarm110',
'strongarm1100', 'arm8', 'arm810', 'arm9', 'arm9e', 'arm920',
'arm920t', 'arm922t', 'arm946e-s', 'arm966e-s', 'arm968e-s',
'arm926ej-s', 'arm940t', 'arm9tdmi', 'arm10tdmi', 'arm1020t',
'arm1026ej-s', 'arm10e', 'arm1020e', 'arm1022e', 'arm1136j-s',
'arm1136jf-s', 'mpcore', 'mpcorenovfp', 'arm1156t2-s',
'arm1176jz-s', 'arm1176jzf-s', 'cortex-a8', 'cortex-r4',
'cortex-m3', 'xscale', 'iwmmxt', 'ep9312'.
'-mtune=NAME'
'-mtune=NAME'
This option is very similar to the '-mcpu=' option, except that
instead of specifying the actual target processor type, and hence
restricting which instructions can be used, it specifies that GCC
should tune the performance of the code as if the target were of
the type specified in this option, but still choosing the
instructions that it will generate based on the cpu specified by a
'-mcpu=' option. For some ARM implementations better performance
can be obtained by using this option.
'-march=NAME'
This specifies the name of the target ARM architecture. GCC uses
this name to determine what kind of instructions it can emit when
generating assembly code. This option can be used in conjunction
with or instead of the '-mcpu=' option. Permissible names are:
'armv2', 'armv2a', 'armv3', 'armv3m', 'armv4', 'armv4t', 'armv5',
'armv5t', 'armv5te', 'armv6', 'armv6j', 'armv6t2', 'armv6z',
'armv6zk', 'armv7', 'armv7-a', 'armv7-r', 'armv7-m', 'iwmmxt',
'ep9312'.
'-mfpu=NAME'
'-mfpe=NUMBER'
'-mfp=NUMBER'
This specifies what floating point hardware (or hardware emulation)
is available on the target. Permissible names are: 'fpa', 'fpe2',
'fpe3', 'maverick', 'vfp'. '-mfp' and '-mfpe' are synonyms for
'-mfpu'='fpe'NUMBER, for compatibility with older versions of GCC.
If '-msoft-float' is specified this specifies the format of
floating point values.
'-mstructure-size-boundary=N'
The size of all structures and unions will be rounded up to a
multiple of the number of bits set by this option. Permissible
values are 8, 32 and 64. The default value varies for different
toolchains. For the COFF targeted toolchain the default value is
8. A value of 64 is only allowed if the underlying ABI supports
it.
Specifying the larger number can produce faster, more efficient
code, but can also increase the size of the program. Different
values are potentially incompatible. Code compiled with one value
cannot necessarily expect to work with code or libraries compiled
with another value, if they exchange information using structures
or unions.
'-mabort-on-noreturn'
Generate a call to the function 'abort' at the end of a 'noreturn'
function. It will be executed if the function tries to return.
'-mlong-calls'
'-mno-long-calls'
Tells the compiler to perform function calls by first loading the
address of the function into a register and then performing a
subroutine call on this register. This switch is needed if the
target function will lie outside of the 64 megabyte addressing
range of the offset based version of subroutine call instruction.
Even if this switch is enabled, not all function calls will be
turned into long calls. The heuristic is that static functions,
functions which have the 'short-call' attribute, functions that are
inside the scope of a '#pragma no_long_calls' directive and
functions whose definitions have already been compiled within the
current compilation unit, will not be turned into long calls. The
exception to this rule is that weak function definitions, functions
with the 'long-call' attribute or the 'section' attribute, and
functions that are within the scope of a '#pragma long_calls'
directive, will always be turned into long calls.
This feature is not enabled by default. Specifying
'-mno-long-calls' will restore the default behavior, as will
placing the function calls within the scope of a '#pragma
long_calls_off' directive. Note these switches have no effect on
how the compiler generates code to handle function calls via
function pointers.
'-mnop-fun-dllimport'
Disable support for the 'dllimport' attribute.
'-msingle-pic-base'
Treat the register used for PIC addressing as read-only, rather
than loading it in the prologue for each function. The run-time
system is responsible for initializing this register with an
appropriate value before execution begins.
'-mpic-register=REG'
Specify the register to be used for PIC addressing. The default is
R10 unless stack-checking is enabled, when R9 is used.
'-mcirrus-fix-invalid-insns'
Insert NOPs into the instruction stream to in order to work around
problems with invalid Maverick instruction combinations. This
option is only valid if the '-mcpu=ep9312' option has been used to
enable generation of instructions for the Cirrus Maverick floating
point co-processor. This option is not enabled by default, since
the problem is only present in older Maverick implementations. The
default can be re-enabled by use of the
'-mno-cirrus-fix-invalid-insns' switch.
'-mpoke-function-name'
Write the name of each function into the text section, directly
preceding the function prologue. The generated code is similar to
this:
t0
.ascii "arm_poke_function_name", 0
.align
t1
.word 0xff000000 + (t1 - t0)
arm_poke_function_name
mov ip, sp
stmfd sp!, {fp, ip, lr, pc}
sub fp, ip, #4
When performing a stack backtrace, code can inspect the value of
'pc' stored at 'fp + 0'. If the trace function then looks at
location 'pc - 12' and the top 8 bits are set, then we know that
there is a function name embedded immediately preceding this
location and has length '((pc[-3]) & 0xff000000)'.
'-mthumb'
Generate code for the Thumb instruction set. The default is to use
the 32-bit ARM instruction set. This option automatically enables
either 16-bit Thumb-1 or mixed 16/32-bit Thumb-2 instructions based
on the '-mcpu=NAME' and '-march=NAME' options.
'-mtpcs-frame'
Generate a stack frame that is compliant with the Thumb Procedure
Call Standard for all non-leaf functions. (A leaf function is one
that does not call any other functions.) The default is
'-mno-tpcs-frame'.
'-mtpcs-leaf-frame'
Generate a stack frame that is compliant with the Thumb Procedure
Call Standard for all leaf functions. (A leaf function is one that
does not call any other functions.) The default is
'-mno-apcs-leaf-frame'.
'-mcallee-super-interworking'
Gives all externally visible functions in the file being compiled
an ARM instruction set header which switches to Thumb mode before
executing the rest of the function. This allows these functions to
be called from non-interworking code.
'-mcaller-super-interworking'
Allows calls via function pointers (including virtual functions) to
execute correctly regardless of whether the target code has been
compiled for interworking or not. There is a small overhead in the
cost of executing a function pointer if this option is enabled.
'-mtp=NAME'
Specify the access model for the thread local storage pointer. The
valid models are 'soft', which generates calls to
'__aeabi_read_tp', 'cp15', which fetches the thread pointer from
'cp15' directly (supported in the arm6k architecture), and 'auto',
which uses the best available method for the selected processor.
The default setting is 'auto'.

File: gcc.info, Node: AVR Options, Next: Blackfin Options, Prev: ARM Options, Up: Submodel Options
3.17.3 AVR Options
------------------
These options are defined for AVR implementations:
'-mmcu=MCU'
Specify ATMEL AVR instruction set or MCU type.
Instruction set avr1 is for the minimal AVR core, not supported by
the C compiler, only for assembler programs (MCU types: at90s1200,
attiny10, attiny11, attiny12, attiny15, attiny28).
Instruction set avr2 (default) is for the classic AVR core with up
to 8K program memory space (MCU types: at90s2313, at90s2323,
attiny22, at90s2333, at90s2343, at90s4414, at90s4433, at90s4434,
at90s8515, at90c8534, at90s8535).
Instruction set avr3 is for the classic AVR core with up to 128K
program memory space (MCU types: atmega103, atmega603, at43usb320,
at76c711).
Instruction set avr4 is for the enhanced AVR core with up to 8K
program memory space (MCU types: atmega8, atmega83, atmega85).
Instruction set avr5 is for the enhanced AVR core with up to 128K
program memory space (MCU types: atmega16, atmega161, atmega163,
atmega32, atmega323, atmega64, atmega128, at43usb355, at94k).
'-msize'
Output instruction sizes to the asm file.
'-minit-stack=N'
Specify the initial stack address, which may be a symbol or numeric
value, '__stack' is the default.
'-mno-interrupts'
Generated code is not compatible with hardware interrupts. Code
size will be smaller.
'-mcall-prologues'
Functions prologues/epilogues expanded as call to appropriate
subroutines. Code size will be smaller.
'-mno-tablejump'
Do not generate tablejump insns which sometimes increase code size.
'-mtiny-stack'
Change only the low 8 bits of the stack pointer.
'-mint8'
Assume int to be 8 bit integer. This affects the sizes of all
types: A char will be 1 byte, an int will be 1 byte, an long will
be 2 bytes and long long will be 4 bytes. Please note that this
option does not comply to the C standards, but it will provide you
with smaller code size.

File: gcc.info, Node: Blackfin Options, Next: CRIS Options, Prev: AVR Options, Up: Submodel Options
3.17.4 Blackfin Options
-----------------------
'-mcpu=CPU[-SIREVISION]'
Specifies the name of the target Blackfin processor. Currently,
CPU can be one of 'bf522', 'bf523', 'bf524', 'bf525', 'bf526',
'bf527', 'bf531', 'bf532', 'bf533', 'bf534', 'bf536', 'bf537',
'bf538', 'bf539', 'bf542', 'bf544', 'bf547', 'bf548', 'bf549',
'bf561'. The optional SIREVISION specifies the silicon revision of
the target Blackfin processor. Any workarounds available for the
targeted silicon revision will be enabled. If SIREVISION is
'none', no workarounds are enabled. If SIREVISION is 'any', all
workarounds for the targeted processor will be enabled. The
'__SILICON_REVISION__' macro is defined to two hexadecimal digits
representing the major and minor numbers in the silicon revision.
If SIREVISION is 'none', the '__SILICON_REVISION__' is not defined.
If SIREVISION is 'any', the '__SILICON_REVISION__' is defined to be
'0xffff'. If this optional SIREVISION is not used, GCC assumes the
latest known silicon revision of the targeted Blackfin processor.
Support for 'bf561' is incomplete. For 'bf561', Only the processor
macro is defined. Without this option, 'bf532' is used as the
processor by default. The corresponding predefined processor
macros for CPU is to be defined. And for 'bfin-elf' toolchain,
this causes the hardware BSP provided by libgloss to be linked in
if '-msim' is not given.
'-msim'
Specifies that the program will be run on the simulator. This
causes the simulator BSP provided by libgloss to be linked in.
This option has effect only for 'bfin-elf' toolchain. Certain
other options, such as '-mid-shared-library' and '-mfdpic', imply
'-msim'.
'-momit-leaf-frame-pointer'
Don't keep the frame pointer in a register for leaf functions.
This avoids the instructions to save, set up and restore frame
pointers and makes an extra register available in leaf functions.
The option '-fomit-frame-pointer' removes the frame pointer for all
functions which might make debugging harder.
'-mspecld-anomaly'
When enabled, the compiler will ensure that the generated code does
not contain speculative loads after jump instructions. If this
option is used, '__WORKAROUND_SPECULATIVE_LOADS' is defined.
'-mno-specld-anomaly'
Don't generate extra code to prevent speculative loads from
occurring.
'-mcsync-anomaly'
When enabled, the compiler will ensure that the generated code does
not contain CSYNC or SSYNC instructions too soon after conditional
branches. If this option is used, '__WORKAROUND_SPECULATIVE_SYNCS'
is defined.
'-mno-csync-anomaly'
Don't generate extra code to prevent CSYNC or SSYNC instructions
from occurring too soon after a conditional branch.
'-mlow-64k'
When enabled, the compiler is free to take advantage of the
knowledge that the entire program fits into the low 64k of memory.
'-mno-low-64k'
Assume that the program is arbitrarily large. This is the default.
'-mstack-check-l1'
Do stack checking using information placed into L1 scratchpad
memory by the uClinux kernel.
'-mid-shared-library'
Generate code that supports shared libraries via the library ID
method. This allows for execute in place and shared libraries in
an environment without virtual memory management. This option
implies '-fPIC'. With a 'bfin-elf' target, this option implies
'-msim'.
'-mno-id-shared-library'
Generate code that doesn't assume ID based shared libraries are
being used. This is the default.
'-mleaf-id-shared-library'
Generate code that supports shared libraries via the library ID
method, but assumes that this library or executable won't link
against any other ID shared libraries. That allows the compiler to
use faster code for jumps and calls.
'-mno-leaf-id-shared-library'
Do not assume that the code being compiled won't link against any
ID shared libraries. Slower code will be generated for jump and
call insns.
'-mshared-library-id=n'
Specified the identification number of the ID based shared library
being compiled. Specifying a value of 0 will generate more compact
code, specifying other values will force the allocation of that
number to the current library but is no more space or time
efficient than omitting this option.
'-msep-data'
Generate code that allows the data segment to be located in a
different area of memory from the text segment. This allows for
execute in place in an environment without virtual memory
management by eliminating relocations against the text section.
'-mno-sep-data'
Generate code that assumes that the data segment follows the text
segment. This is the default.
'-mlong-calls'
'-mno-long-calls'
Tells the compiler to perform function calls by first loading the
address of the function into a register and then performing a
subroutine call on this register. This switch is needed if the
target function will lie outside of the 24 bit addressing range of
the offset based version of subroutine call instruction.
This feature is not enabled by default. Specifying
'-mno-long-calls' will restore the default behavior. Note these
switches have no effect on how the compiler generates code to
handle function calls via function pointers.
'-mfast-fp'
Link with the fast floating-point library. This library relaxes
some of the IEEE floating-point standard's rules for checking
inputs against Not-a-Number (NAN), in the interest of performance.
'-minline-plt'
Enable inlining of PLT entries in function calls to functions that
are not known to bind locally. It has no effect without '-mfdpic'.

File: gcc.info, Node: CRIS Options, Next: CRX Options, Prev: Blackfin Options, Up: Submodel Options
3.17.5 CRIS Options
-------------------
These options are defined specifically for the CRIS ports.
'-march=ARCHITECTURE-TYPE'
'-mcpu=ARCHITECTURE-TYPE'
Generate code for the specified architecture. The choices for
ARCHITECTURE-TYPE are 'v3', 'v8' and 'v10' for respectively
ETRAX 4, ETRAX 100, and ETRAX 100 LX. Default is 'v0' except for
cris-axis-linux-gnu, where the default is 'v10'.
'-mtune=ARCHITECTURE-TYPE'
Tune to ARCHITECTURE-TYPE everything applicable about the generated
code, except for the ABI and the set of available instructions.
The choices for ARCHITECTURE-TYPE are the same as for
'-march=ARCHITECTURE-TYPE'.
'-mmax-stack-frame=N'
Warn when the stack frame of a function exceeds N bytes.
'-melinux-stacksize=N'
Only available with the 'cris-axis-aout' target. Arranges for
indications in the program to the kernel loader that the stack of
the program should be set to N bytes.
'-metrax4'
'-metrax100'
The options '-metrax4' and '-metrax100' are synonyms for
'-march=v3' and '-march=v8' respectively.
'-mmul-bug-workaround'
'-mno-mul-bug-workaround'
Work around a bug in the 'muls' and 'mulu' instructions for CPU
models where it applies. This option is active by default.
'-mpdebug'
Enable CRIS-specific verbose debug-related information in the
assembly code. This option also has the effect to turn off the
'#NO_APP' formatted-code indicator to the assembler at the
beginning of the assembly file.
'-mcc-init'
Do not use condition-code results from previous instruction; always
emit compare and test instructions before use of condition codes.
'-mno-side-effects'
Do not emit instructions with side-effects in addressing modes
other than post-increment.
'-mstack-align'
'-mno-stack-align'
'-mdata-align'
'-mno-data-align'
'-mconst-align'
'-mno-const-align'
These options (no-options) arranges (eliminate arrangements) for
the stack-frame, individual data and constants to be aligned for
the maximum single data access size for the chosen CPU model. The
default is to arrange for 32-bit alignment. ABI details such as
structure layout are not affected by these options.
'-m32-bit'
'-m16-bit'
'-m8-bit'
Similar to the stack- data- and const-align options above, these
options arrange for stack-frame, writable data and constants to all
be 32-bit, 16-bit or 8-bit aligned. The default is 32-bit
alignment.
'-mno-prologue-epilogue'
'-mprologue-epilogue'
With '-mno-prologue-epilogue', the normal function prologue and
epilogue that sets up the stack-frame are omitted and no return
instructions or return sequences are generated in the code. Use
this option only together with visual inspection of the compiled
code: no warnings or errors are generated when call-saved registers
must be saved, or storage for local variable needs to be allocated.
'-mno-gotplt'
'-mgotplt'
With '-fpic' and '-fPIC', don't generate (do generate) instruction
sequences that load addresses for functions from the PLT part of
the GOT rather than (traditional on other architectures) calls to
the PLT. The default is '-mgotplt'.
'-maout'
Legacy no-op option only recognized with the cris-axis-aout target.
'-melf'
Legacy no-op option only recognized with the cris-axis-elf and
cris-axis-linux-gnu targets.
'-melinux'
Only recognized with the cris-axis-aout target, where it selects a
GNU/linux-like multilib, include files and instruction set for
'-march=v8'.
'-mlinux'
Legacy no-op option only recognized with the cris-axis-linux-gnu
target.
'-sim'
This option, recognized for the cris-axis-aout and cris-axis-elf
arranges to link with input-output functions from a simulator
library. Code, initialized data and zero-initialized data are
allocated consecutively.
'-sim2'
Like '-sim', but pass linker options to locate initialized data at
0x40000000 and zero-initialized data at 0x80000000.

File: gcc.info, Node: CRX Options, Next: Darwin Options, Prev: CRIS Options, Up: Submodel Options
3.17.6 CRX Options
------------------
These options are defined specifically for the CRX ports.
'-mmac'
Enable the use of multiply-accumulate instructions. Disabled by
default.
'-mpush-args'
Push instructions will be used to pass outgoing arguments when
functions are called. Enabled by default.

File: gcc.info, Node: Darwin Options, Next: DEC Alpha Options, Prev: CRX Options, Up: Submodel Options
3.17.7 Darwin Options
---------------------
These options are defined for all architectures running the Darwin
operating system.
FSF GCC on Darwin does not create "fat" object files; it will create an
object file for the single architecture that it was built to target.
Apple's GCC on Darwin does create "fat" files if multiple '-arch'
options are used; it does so by running the compiler or linker multiple
times and joining the results together with 'lipo'.
The subtype of the file created (like 'ppc7400' or 'ppc970' or 'i686')
is determined by the flags that specify the ISA that GCC is targetting,
like '-mcpu' or '-march'. The '-force_cpusubtype_ALL' option can be
used to override this.
The Darwin tools vary in their behavior when presented with an ISA
mismatch. The assembler, 'as', will only permit instructions to be used
that are valid for the subtype of the file it is generating, so you
cannot put 64-bit instructions in an 'ppc750' object file. The linker
for shared libraries, '/usr/bin/libtool', will fail and print an error
if asked to create a shared library with a less restrictive subtype than
its input files (for instance, trying to put a 'ppc970' object file in a
'ppc7400' library). The linker for executables, 'ld', will quietly give
the executable the most restrictive subtype of any of its input files.
'-FDIR'
Add the framework directory DIR to the head of the list of
directories to be searched for header files. These directories are
interleaved with those specified by '-I' options and are scanned in
a left-to-right order.
A framework directory is a directory with frameworks in it. A
framework is a directory with a '"Headers"' and/or
'"PrivateHeaders"' directory contained directly in it that ends in
'".framework"'. The name of a framework is the name of this
directory excluding the '".framework"'. Headers associated with
the framework are found in one of those two directories, with
'"Headers"' being searched first. A subframework is a framework
directory that is in a framework's '"Frameworks"' directory.
Includes of subframework headers can only appear in a header of a
framework that contains the subframework, or in a sibling
subframework header. Two subframeworks are siblings if they occur
in the same framework. A subframework should not have the same
name as a framework, a warning will be issued if this is violated.
Currently a subframework cannot have subframeworks, in the future,
the mechanism may be extended to support this. The standard
frameworks can be found in '"/System/Library/Frameworks"' and
'"/Library/Frameworks"'. An example include looks like '#include
<Framework/header.h>', where 'Framework' denotes the name of the
framework and header.h is found in the '"PrivateHeaders"' or
'"Headers"' directory.
'-iframeworkDIR'
Like '-F' except the directory is a treated as a system directory.
The main difference between this '-iframework' and '-F' is that
with '-iframework' the compiler does not warn about constructs
contained within header files found via DIR. This option is valid
only for the C family of languages.
'-gused'
Emit debugging information for symbols that are used. For STABS
debugging format, this enables '-feliminate-unused-debug-symbols'.
This is by default ON.
'-gfull'
Emit debugging information for all symbols and types.
'-mmacosx-version-min=VERSION'
The earliest version of MacOS X that this executable will run on is
VERSION. Typical values of VERSION include '10.1', '10.2', and
'10.3.9'.
If the compiler was built to use the system's headers by default,
then the default for this option is the system version on which the
compiler is running, otherwise the default is to make choices which
are compatible with as many systems and code bases as possible.
'-mkernel'
Enable kernel development mode. The '-mkernel' option sets
'-static', '-fno-common', '-fno-cxa-atexit', '-fno-exceptions',
'-fno-non-call-exceptions', '-fapple-kext', '-fno-weak' and
'-fno-rtti' where applicable. This mode also sets '-mno-altivec',
'-msoft-float', '-fno-builtin' and '-mlong-branch' for PowerPC
targets.
'-mone-byte-bool'
Override the defaults for 'bool' so that 'sizeof(bool)==1'. By
default 'sizeof(bool)' is '4' when compiling for Darwin/PowerPC and
'1' when compiling for Darwin/x86, so this option has no effect on
x86.
*Warning:* The '-mone-byte-bool' switch causes GCC to generate code
that is not binary compatible with code generated without that
switch. Using this switch may require recompiling all other
modules in a program, including system libraries. Use this switch
to conform to a non-default data model.
'-mfix-and-continue'
'-ffix-and-continue'
'-findirect-data'
Generate code suitable for fast turn around development. Needed to
enable gdb to dynamically load '.o' files into already running
programs. '-findirect-data' and '-ffix-and-continue' are provided
for backwards compatibility.
'-all_load'
Loads all members of static archive libraries. See man ld(1) for
more information.
'-arch_errors_fatal'
Cause the errors having to do with files that have the wrong
architecture to be fatal.
'-bind_at_load'
Causes the output file to be marked such that the dynamic linker
will bind all undefined references when the file is loaded or
launched.
'-bundle'
Produce a Mach-o bundle format file. See man ld(1) for more
information.
'-bundle_loader EXECUTABLE'
This option specifies the EXECUTABLE that will be loading the build
output file being linked. See man ld(1) for more information.
'-dynamiclib'
When passed this option, GCC will produce a dynamic library instead
of an executable when linking, using the Darwin 'libtool' command.
'-force_cpusubtype_ALL'
This causes GCC's output file to have the ALL subtype, instead of
one controlled by the '-mcpu' or '-march' option.
'-allowable_client CLIENT_NAME'
'-client_name'
'-compatibility_version'
'-current_version'
'-dead_strip'
'-dependency-file'
'-dylib_file'
'-dylinker_install_name'
'-dynamic'
'-exported_symbols_list'
'-filelist'
'-flat_namespace'
'-force_flat_namespace'
'-headerpad_max_install_names'
'-image_base'
'-init'
'-install_name'
'-keep_private_externs'
'-multi_module'
'-multiply_defined'
'-multiply_defined_unused'
'-noall_load'
'-no_dead_strip_inits_and_terms'
'-nofixprebinding'
'-nomultidefs'
'-noprebind'
'-noseglinkedit'
'-pagezero_size'
'-prebind'
'-prebind_all_twolevel_modules'
'-private_bundle'
'-read_only_relocs'
'-sectalign'
'-sectobjectsymbols'
'-whyload'
'-seg1addr'
'-sectcreate'
'-sectobjectsymbols'
'-sectorder'
'-segaddr'
'-segs_read_only_addr'
'-segs_read_write_addr'
'-seg_addr_table'
'-seg_addr_table_filename'
'-seglinkedit'
'-segprot'
'-segs_read_only_addr'
'-segs_read_write_addr'
'-single_module'
'-static'
'-sub_library'
'-sub_umbrella'
'-twolevel_namespace'
'-umbrella'
'-undefined'
'-unexported_symbols_list'
'-weak_reference_mismatches'
'-whatsloaded'
These options are passed to the Darwin linker. The Darwin linker
man page describes them in detail.

File: gcc.info, Node: DEC Alpha Options, Next: DEC Alpha/VMS Options, Prev: Darwin Options, Up: Submodel Options
3.17.8 DEC Alpha Options
------------------------
These '-m' options are defined for the DEC Alpha implementations:
'-mno-soft-float'
'-msoft-float'
Use (do not use) the hardware floating-point instructions for
floating-point operations. When '-msoft-float' is specified,
functions in 'libgcc.a' will be used to perform floating-point
operations. Unless they are replaced by routines that emulate the
floating-point operations, or compiled in such a way as to call
such emulations routines, these routines will issue floating-point
operations. If you are compiling for an Alpha without
floating-point operations, you must ensure that the library is
built so as not to call them.
Note that Alpha implementations without floating-point operations
are required to have floating-point registers.
'-mfp-reg'
'-mno-fp-regs'
Generate code that uses (does not use) the floating-point register
set. '-mno-fp-regs' implies '-msoft-float'. If the floating-point
register set is not used, floating point operands are passed in
integer registers as if they were integers and floating-point
results are passed in '$0' instead of '$f0'. This is a
non-standard calling sequence, so any function with a
floating-point argument or return value called by code compiled
with '-mno-fp-regs' must also be compiled with that option.
A typical use of this option is building a kernel that does not
use, and hence need not save and restore, any floating-point
registers.
'-mieee'
The Alpha architecture implements floating-point hardware optimized
for maximum performance. It is mostly compliant with the IEEE
floating point standard. However, for full compliance, software
assistance is required. This option generates code fully IEEE
compliant code _except_ that the INEXACT-FLAG is not maintained
(see below). If this option is turned on, the preprocessor macro
'_IEEE_FP' is defined during compilation. The resulting code is
less efficient but is able to correctly support denormalized
numbers and exceptional IEEE values such as not-a-number and
plus/minus infinity. Other Alpha compilers call this option
'-ieee_with_no_inexact'.
'-mieee-with-inexact'
This is like '-mieee' except the generated code also maintains the
IEEE INEXACT-FLAG. Turning on this option causes the generated
code to implement fully-compliant IEEE math. In addition to
'_IEEE_FP', '_IEEE_FP_EXACT' is defined as a preprocessor macro.
On some Alpha implementations the resulting code may execute
significantly slower than the code generated by default. Since
there is very little code that depends on the INEXACT-FLAG, you
should normally not specify this option. Other Alpha compilers
call this option '-ieee_with_inexact'.
'-mfp-trap-mode=TRAP-MODE'
This option controls what floating-point related traps are enabled.
Other Alpha compilers call this option '-fptm TRAP-MODE'. The trap
mode can be set to one of four values:
'n'
This is the default (normal) setting. The only traps that are
enabled are the ones that cannot be disabled in software
(e.g., division by zero trap).
'u'
In addition to the traps enabled by 'n', underflow traps are
enabled as well.
'su'
Like 'u', but the instructions are marked to be safe for
software completion (see Alpha architecture manual for
details).
'sui'
Like 'su', but inexact traps are enabled as well.
'-mfp-rounding-mode=ROUNDING-MODE'
Selects the IEEE rounding mode. Other Alpha compilers call this
option '-fprm ROUNDING-MODE'. The ROUNDING-MODE can be one of:
'n'
Normal IEEE rounding mode. Floating point numbers are rounded
towards the nearest machine number or towards the even machine
number in case of a tie.
'm'
Round towards minus infinity.
'c'
Chopped rounding mode. Floating point numbers are rounded
towards zero.
'd'
Dynamic rounding mode. A field in the floating point control
register (FPCR, see Alpha architecture reference manual)
controls the rounding mode in effect. The C library
initializes this register for rounding towards plus infinity.
Thus, unless your program modifies the FPCR, 'd' corresponds
to round towards plus infinity.
'-mtrap-precision=TRAP-PRECISION'
In the Alpha architecture, floating point traps are imprecise.
This means without software assistance it is impossible to recover
from a floating trap and program execution normally needs to be
terminated. GCC can generate code that can assist operating system
trap handlers in determining the exact location that caused a
floating point trap. Depending on the requirements of an
application, different levels of precisions can be selected:
'p'
Program precision. This option is the default and means a
trap handler can only identify which program caused a floating
point exception.
'f'
Function precision. The trap handler can determine the
function that caused a floating point exception.
'i'
Instruction precision. The trap handler can determine the
exact instruction that caused a floating point exception.
Other Alpha compilers provide the equivalent options called
'-scope_safe' and '-resumption_safe'.
'-mieee-conformant'
This option marks the generated code as IEEE conformant. You must
not use this option unless you also specify '-mtrap-precision=i'
and either '-mfp-trap-mode=su' or '-mfp-trap-mode=sui'. Its only
effect is to emit the line '.eflag 48' in the function prologue of
the generated assembly file. Under DEC Unix, this has the effect
that IEEE-conformant math library routines will be linked in.
'-mbuild-constants'
Normally GCC examines a 32- or 64-bit integer constant to see if it
can construct it from smaller constants in two or three
instructions. If it cannot, it will output the constant as a
literal and generate code to load it from the data segment at
runtime.
Use this option to require GCC to construct _all_ integer constants
using code, even if it takes more instructions (the maximum is
six).
You would typically use this option to build a shared library
dynamic loader. Itself a shared library, it must relocate itself
in memory before it can find the variables and constants in its own
data segment.
'-malpha-as'
'-mgas'
Select whether to generate code to be assembled by the
vendor-supplied assembler ('-malpha-as') or by the GNU assembler
'-mgas'.
'-mbwx'
'-mno-bwx'
'-mcix'
'-mno-cix'
'-mfix'
'-mno-fix'
'-mmax'
'-mno-max'
Indicate whether GCC should generate code to use the optional BWX,
CIX, FIX and MAX instruction sets. The default is to use the
instruction sets supported by the CPU type specified via '-mcpu='
option or that of the CPU on which GCC was built if none was
specified.
'-mfloat-vax'
'-mfloat-ieee'
Generate code that uses (does not use) VAX F and G floating point
arithmetic instead of IEEE single and double precision.
'-mexplicit-relocs'
'-mno-explicit-relocs'
Older Alpha assemblers provided no way to generate symbol
relocations except via assembler macros. Use of these macros does
not allow optimal instruction scheduling. GNU binutils as of
version 2.12 supports a new syntax that allows the compiler to
explicitly mark which relocations should apply to which
instructions. This option is mostly useful for debugging, as GCC
detects the capabilities of the assembler when it is built and sets
the default accordingly.
'-msmall-data'
'-mlarge-data'
When '-mexplicit-relocs' is in effect, static data is accessed via
"gp-relative" relocations. When '-msmall-data' is used, objects 8
bytes long or smaller are placed in a "small data area" (the
'.sdata' and '.sbss' sections) and are accessed via 16-bit
relocations off of the '$gp' register. This limits the size of the
small data area to 64KB, but allows the variables to be directly
accessed via a single instruction.
The default is '-mlarge-data'. With this option the data area is
limited to just below 2GB. Programs that require more than 2GB of
data must use 'malloc' or 'mmap' to allocate the data in the heap
instead of in the program's data segment.
When generating code for shared libraries, '-fpic' implies
'-msmall-data' and '-fPIC' implies '-mlarge-data'.
'-msmall-text'
'-mlarge-text'
When '-msmall-text' is used, the compiler assumes that the code of
the entire program (or shared library) fits in 4MB, and is thus
reachable with a branch instruction. When '-msmall-data' is used,
the compiler can assume that all local symbols share the same '$gp'
value, and thus reduce the number of instructions required for a
function call from 4 to 1.
The default is '-mlarge-text'.
'-mcpu=CPU_TYPE'
Set the instruction set and instruction scheduling parameters for
machine type CPU_TYPE. You can specify either the 'EV' style name
or the corresponding chip number. GCC supports scheduling
parameters for the EV4, EV5 and EV6 family of processors and will
choose the default values for the instruction set from the
processor you specify. If you do not specify a processor type, GCC
will default to the processor on which the compiler was built.
Supported values for CPU_TYPE are
'ev4'
'ev45'
'21064'
Schedules as an EV4 and has no instruction set extensions.
'ev5'
'21164'
Schedules as an EV5 and has no instruction set extensions.
'ev56'
'21164a'
Schedules as an EV5 and supports the BWX extension.
'pca56'
'21164pc'
'21164PC'
Schedules as an EV5 and supports the BWX and MAX extensions.
'ev6'
'21264'
Schedules as an EV6 and supports the BWX, FIX, and MAX
extensions.
'ev67'
'21264a'
Schedules as an EV6 and supports the BWX, CIX, FIX, and MAX
extensions.
'-mtune=CPU_TYPE'
Set only the instruction scheduling parameters for machine type
CPU_TYPE. The instruction set is not changed.
'-mmemory-latency=TIME'
Sets the latency the scheduler should assume for typical memory
references as seen by the application. This number is highly
dependent on the memory access patterns used by the application and
the size of the external cache on the machine.
Valid options for TIME are
'NUMBER'
A decimal number representing clock cycles.
'L1'
'L2'
'L3'
'main'
The compiler contains estimates of the number of clock cycles
for "typical" EV4 & EV5 hardware for the Level 1, 2 & 3 caches
(also called Dcache, Scache, and Bcache), as well as to main
memory. Note that L3 is only valid for EV5.

File: gcc.info, Node: DEC Alpha/VMS Options, Next: FRV Options, Prev: DEC Alpha Options, Up: Submodel Options
3.17.9 DEC Alpha/VMS Options
----------------------------
These '-m' options are defined for the DEC Alpha/VMS implementations:
'-mvms-return-codes'
Return VMS condition codes from main. The default is to return
POSIX style condition (e.g. error) codes.

File: gcc.info, Node: FRV Options, Next: GNU/Linux Options, Prev: DEC Alpha/VMS Options, Up: Submodel Options
3.17.10 FRV Options
-------------------
'-mgpr-32'
Only use the first 32 general purpose registers.
'-mgpr-64'
Use all 64 general purpose registers.
'-mfpr-32'
Use only the first 32 floating point registers.
'-mfpr-64'
Use all 64 floating point registers
'-mhard-float'
Use hardware instructions for floating point operations.
'-msoft-float'
Use library routines for floating point operations.
'-malloc-cc'
Dynamically allocate condition code registers.
'-mfixed-cc'
Do not try to dynamically allocate condition code registers, only
use 'icc0' and 'fcc0'.
'-mdword'
Change ABI to use double word insns.
'-mno-dword'
Do not use double word instructions.
'-mdouble'
Use floating point double instructions.
'-mno-double'
Do not use floating point double instructions.
'-mmedia'
Use media instructions.
'-mno-media'
Do not use media instructions.
'-mmuladd'
Use multiply and add/subtract instructions.
'-mno-muladd'
Do not use multiply and add/subtract instructions.
'-mfdpic'
Select the FDPIC ABI, that uses function descriptors to represent
pointers to functions. Without any PIC/PIE-related options, it
implies '-fPIE'. With '-fpic' or '-fpie', it assumes GOT entries
and small data are within a 12-bit range from the GOT base address;
with '-fPIC' or '-fPIE', GOT offsets are computed with 32 bits.
With a 'bfin-elf' target, this option implies '-msim'.
'-minline-plt'
Enable inlining of PLT entries in function calls to functions that
are not known to bind locally. It has no effect without '-mfdpic'.
It's enabled by default if optimizing for speed and compiling for
shared libraries (i.e., '-fPIC' or '-fpic'), or when an
optimization option such as '-O3' or above is present in the
command line.
'-mTLS'
Assume a large TLS segment when generating thread-local code.
'-mtls'
Do not assume a large TLS segment when generating thread-local
code.
'-mgprel-ro'
Enable the use of 'GPREL' relocations in the FDPIC ABI for data
that is known to be in read-only sections. It's enabled by
default, except for '-fpic' or '-fpie': even though it may help
make the global offset table smaller, it trades 1 instruction for
4. With '-fPIC' or '-fPIE', it trades 3 instructions for 4, one of
which may be shared by multiple symbols, and it avoids the need for
a GOT entry for the referenced symbol, so it's more likely to be a
win. If it is not, '-mno-gprel-ro' can be used to disable it.
'-multilib-library-pic'
Link with the (library, not FD) pic libraries. It's implied by
'-mlibrary-pic', as well as by '-fPIC' and '-fpic' without
'-mfdpic'. You should never have to use it explicitly.
'-mlinked-fp'
Follow the EABI requirement of always creating a frame pointer
whenever a stack frame is allocated. This option is enabled by
default and can be disabled with '-mno-linked-fp'.
'-mlong-calls'
Use indirect addressing to call functions outside the current
compilation unit. This allows the functions to be placed anywhere
within the 32-bit address space.
'-malign-labels'
Try to align labels to an 8-byte boundary by inserting nops into
the previous packet. This option only has an effect when VLIW
packing is enabled. It doesn't create new packets; it merely adds
nops to existing ones.
'-mlibrary-pic'
Generate position-independent EABI code.
'-macc-4'
Use only the first four media accumulator registers.
'-macc-8'
Use all eight media accumulator registers.
'-mpack'
Pack VLIW instructions.
'-mno-pack'
Do not pack VLIW instructions.
'-mno-eflags'
Do not mark ABI switches in e_flags.
'-mcond-move'
Enable the use of conditional-move instructions (default).
This switch is mainly for debugging the compiler and will likely be
removed in a future version.
'-mno-cond-move'
Disable the use of conditional-move instructions.
This switch is mainly for debugging the compiler and will likely be
removed in a future version.
'-mscc'
Enable the use of conditional set instructions (default).
This switch is mainly for debugging the compiler and will likely be
removed in a future version.
'-mno-scc'
Disable the use of conditional set instructions.
This switch is mainly for debugging the compiler and will likely be
removed in a future version.
'-mcond-exec'
Enable the use of conditional execution (default).
This switch is mainly for debugging the compiler and will likely be
removed in a future version.
'-mno-cond-exec'
Disable the use of conditional execution.
This switch is mainly for debugging the compiler and will likely be
removed in a future version.
'-mvliw-branch'
Run a pass to pack branches into VLIW instructions (default).
This switch is mainly for debugging the compiler and will likely be
removed in a future version.
'-mno-vliw-branch'
Do not run a pass to pack branches into VLIW instructions.
This switch is mainly for debugging the compiler and will likely be
removed in a future version.
'-mmulti-cond-exec'
Enable optimization of '&&' and '||' in conditional execution
(default).
This switch is mainly for debugging the compiler and will likely be
removed in a future version.
'-mno-multi-cond-exec'
Disable optimization of '&&' and '||' in conditional execution.
This switch is mainly for debugging the compiler and will likely be
removed in a future version.
'-mnested-cond-exec'
Enable nested conditional execution optimizations (default).
This switch is mainly for debugging the compiler and will likely be
removed in a future version.
'-mno-nested-cond-exec'
Disable nested conditional execution optimizations.
This switch is mainly for debugging the compiler and will likely be
removed in a future version.
'-moptimize-membar'
This switch removes redundant 'membar' instructions from the
compiler generated code. It is enabled by default.
'-mno-optimize-membar'
This switch disables the automatic removal of redundant 'membar'
instructions from the generated code.
'-mtomcat-stats'
Cause gas to print out tomcat statistics.
'-mcpu=CPU'
Select the processor type for which to generate code. Possible
values are 'frv', 'fr550', 'tomcat', 'fr500', 'fr450', 'fr405',
'fr400', 'fr300' and 'simple'.

File: gcc.info, Node: GNU/Linux Options, Next: H8/300 Options, Prev: FRV Options, Up: Submodel Options
3.17.11 GNU/Linux Options
-------------------------
These '-m' options are defined for GNU/Linux targets:
'-mglibc'
Use the GNU C library instead of uClibc. This is the default
except on '*-*-linux-*uclibc*' targets.
'-muclibc'
Use uClibc instead of the GNU C library. This is the default on
'*-*-linux-*uclibc*' targets.

File: gcc.info, Node: H8/300 Options, Next: HPPA Options, Prev: GNU/Linux Options, Up: Submodel Options
3.17.12 H8/300 Options
----------------------
These '-m' options are defined for the H8/300 implementations:
'-mrelax'
Shorten some address references at link time, when possible; uses
the linker option '-relax'. *Note 'ld' and the H8/300: (ld)H8/300,
for a fuller description.
'-mh'
Generate code for the H8/300H.
'-ms'
Generate code for the H8S.
'-mn'
Generate code for the H8S and H8/300H in the normal mode. This
switch must be used either with '-mh' or '-ms'.
'-ms2600'
Generate code for the H8S/2600. This switch must be used with
'-ms'.
'-mint32'
Make 'int' data 32 bits by default.
'-malign-300'
On the H8/300H and H8S, use the same alignment rules as for the
H8/300. The default for the H8/300H and H8S is to align longs and
floats on 4 byte boundaries. '-malign-300' causes them to be
aligned on 2 byte boundaries. This option has no effect on the
H8/300.

File: gcc.info, Node: HPPA Options, Next: i386 and x86-64 Options, Prev: H8/300 Options, Up: Submodel Options
3.17.13 HPPA Options
--------------------
These '-m' options are defined for the HPPA family of computers:
'-march=ARCHITECTURE-TYPE'
Generate code for the specified architecture. The choices for
ARCHITECTURE-TYPE are '1.0' for PA 1.0, '1.1' for PA 1.1, and '2.0'
for PA 2.0 processors. Refer to '/usr/lib/sched.models' on an
HP-UX system to determine the proper architecture option for your
machine. Code compiled for lower numbered architectures will run
on higher numbered architectures, but not the other way around.
'-mpa-risc-1-0'
'-mpa-risc-1-1'
'-mpa-risc-2-0'
Synonyms for '-march=1.0', '-march=1.1', and '-march=2.0'
respectively.
'-mbig-switch'
Generate code suitable for big switch tables. Use this option only
if the assembler/linker complain about out of range branches within
a switch table.
'-mjump-in-delay'
Fill delay slots of function calls with unconditional jump
instructions by modifying the return pointer for the function call
to be the target of the conditional jump.
'-mdisable-fpregs'
Prevent floating point registers from being used in any manner.
This is necessary for compiling kernels which perform lazy context
switching of floating point registers. If you use this option and
attempt to perform floating point operations, the compiler will
abort.
'-mdisable-indexing'
Prevent the compiler from using indexing address modes. This
avoids some rather obscure problems when compiling MIG generated
code under MACH.
'-mno-space-regs'
Generate code that assumes the target has no space registers. This
allows GCC to generate faster indirect calls and use unscaled index
address modes.
Such code is suitable for level 0 PA systems and kernels.
'-mfast-indirect-calls'
Generate code that assumes calls never cross space boundaries.
This allows GCC to emit code which performs faster indirect calls.
This option will not work in the presence of shared libraries or
nested functions.
'-mfixed-range=REGISTER-RANGE'
Generate code treating the given register range as fixed registers.
A fixed register is one that the register allocator can not use.
This is useful when compiling kernel code. A register range is
specified as two registers separated by a dash. Multiple register
ranges can be specified separated by a comma.
'-mlong-load-store'
Generate 3-instruction load and store sequences as sometimes
required by the HP-UX 10 linker. This is equivalent to the '+k'
option to the HP compilers.
'-mportable-runtime'
Use the portable calling conventions proposed by HP for ELF
systems.
'-mgas'
Enable the use of assembler directives only GAS understands.
'-mschedule=CPU-TYPE'
Schedule code according to the constraints for the machine type
CPU-TYPE. The choices for CPU-TYPE are '700' '7100', '7100LC',
'7200', '7300' and '8000'. Refer to '/usr/lib/sched.models' on an
HP-UX system to determine the proper scheduling option for your
machine. The default scheduling is '8000'.
'-mlinker-opt'
Enable the optimization pass in the HP-UX linker. Note this makes
symbolic debugging impossible. It also triggers a bug in the HP-UX
8 and HP-UX 9 linkers in which they give bogus error messages when
linking some programs.
'-msoft-float'
Generate output containing library calls for floating point.
*Warning:* the requisite libraries are not available for all HPPA
targets. Normally the facilities of the machine's usual C compiler
are used, but this cannot be done directly in cross-compilation.
You must make your own arrangements to provide suitable library
functions for cross-compilation. The embedded target
'hppa1.1-*-pro' does provide software floating point support.
'-msoft-float' changes the calling convention in the output file;
therefore, it is only useful if you compile _all_ of a program with
this option. In particular, you need to compile 'libgcc.a', the
library that comes with GCC, with '-msoft-float' in order for this
to work.
'-msio'
Generate the predefine, '_SIO', for server IO. The default is
'-mwsio'. This generates the predefines, '__hp9000s700',
'__hp9000s700__' and '_WSIO', for workstation IO. These options
are available under HP-UX and HI-UX.
'-mgnu-ld'
Use GNU ld specific options. This passes '-shared' to ld when
building a shared library. It is the default when GCC is
configured, explicitly or implicitly, with the GNU linker. This
option does not have any affect on which ld is called, it only
changes what parameters are passed to that ld. The ld that is
called is determined by the '--with-ld' configure option, GCC's
program search path, and finally by the user's 'PATH'. The linker
used by GCC can be printed using 'which `gcc -print-prog-name=ld`'.
This option is only available on the 64 bit HP-UX GCC, i.e.
configured with 'hppa*64*-*-hpux*'.
'-mhp-ld'
Use HP ld specific options. This passes '-b' to ld when building a
shared library and passes '+Accept TypeMismatch' to ld on all
links. It is the default when GCC is configured, explicitly or
implicitly, with the HP linker. This option does not have any
affect on which ld is called, it only changes what parameters are
passed to that ld. The ld that is called is determined by the
'--with-ld' configure option, GCC's program search path, and
finally by the user's 'PATH'. The linker used by GCC can be
printed using 'which `gcc -print-prog-name=ld`'. This option is
only available on the 64 bit HP-UX GCC, i.e. configured with
'hppa*64*-*-hpux*'.
'-mlong-calls'
Generate code that uses long call sequences. This ensures that a
call is always able to reach linker generated stubs. The default
is to generate long calls only when the distance from the call site
to the beginning of the function or translation unit, as the case
may be, exceeds a predefined limit set by the branch type being
used. The limits for normal calls are 7,600,000 and 240,000 bytes,
respectively for the PA 2.0 and PA 1.X architectures. Sibcalls are
always limited at 240,000 bytes.
Distances are measured from the beginning of functions when using
the '-ffunction-sections' option, or when using the '-mgas' and
'-mno-portable-runtime' options together under HP-UX with the SOM
linker.
It is normally not desirable to use this option as it will degrade
performance. However, it may be useful in large applications,
particularly when partial linking is used to build the application.
The types of long calls used depends on the capabilities of the
assembler and linker, and the type of code being generated. The
impact on systems that support long absolute calls, and long pic
symbol-difference or pc-relative calls should be relatively small.
However, an indirect call is used on 32-bit ELF systems in pic code
and it is quite long.
'-munix=UNIX-STD'
Generate compiler predefines and select a startfile for the
specified UNIX standard. The choices for UNIX-STD are '93', '95'
and '98'. '93' is supported on all HP-UX versions. '95' is
available on HP-UX 10.10 and later. '98' is available on HP-UX
11.11 and later. The default values are '93' for HP-UX 10.00, '95'
for HP-UX 10.10 though to 11.00, and '98' for HP-UX 11.11 and
later.
'-munix=93' provides the same predefines as GCC 3.3 and 3.4.
'-munix=95' provides additional predefines for 'XOPEN_UNIX' and
'_XOPEN_SOURCE_EXTENDED', and the startfile 'unix95.o'.
'-munix=98' provides additional predefines for '_XOPEN_UNIX',
'_XOPEN_SOURCE_EXTENDED', '_INCLUDE__STDC_A1_SOURCE' and
'_INCLUDE_XOPEN_SOURCE_500', and the startfile 'unix98.o'.
It is _important_ to note that this option changes the interfaces
for various library routines. It also affects the operational
behavior of the C library. Thus, _extreme_ care is needed in using
this option.
Library code that is intended to operate with more than one UNIX
standard must test, set and restore the variable
__XPG4_EXTENDED_MASK as appropriate. Most GNU software doesn't
provide this capability.
'-nolibdld'
Suppress the generation of link options to search libdld.sl when
the '-static' option is specified on HP-UX 10 and later.
'-static'
The HP-UX implementation of setlocale in libc has a dependency on
libdld.sl. There isn't an archive version of libdld.sl. Thus,
when the '-static' option is specified, special link options are
needed to resolve this dependency.
On HP-UX 10 and later, the GCC driver adds the necessary options to
link with libdld.sl when the '-static' option is specified. This
causes the resulting binary to be dynamic. On the 64-bit port, the
linkers generate dynamic binaries by default in any case. The
'-nolibdld' option can be used to prevent the GCC driver from
adding these link options.
'-threads'
Add support for multithreading with the "dce thread" library under
HP-UX. This option sets flags for both the preprocessor and
linker.

File: gcc.info, Node: i386 and x86-64 Options, Next: IA-64 Options, Prev: HPPA Options, Up: Submodel Options
3.17.14 Intel 386 and AMD x86-64 Options
----------------------------------------
These '-m' options are defined for the i386 and x86-64 family of
computers:
'-mtune=CPU-TYPE'
Tune to CPU-TYPE everything applicable about the generated code,
except for the ABI and the set of available instructions. The
choices for CPU-TYPE are:
_generic_
Produce code optimized for the most common IA32/AMD64/EM64T
processors. If you know the CPU on which your code will run,
then you should use the corresponding '-mtune' option instead
of '-mtune=generic'. But, if you do not know exactly what CPU
users of your application will have, then you should use this
option.
As new processors are deployed in the marketplace, the
behavior of this option will change. Therefore, if you
upgrade to a newer version of GCC, the code generated option
will change to reflect the processors that were most common
when that version of GCC was released.
There is no '-march=generic' option because '-march' indicates
the instruction set the compiler can use, and there is no
generic instruction set applicable to all processors. In
contrast, '-mtune' indicates the processor (or, in this case,
collection of processors) for which the code is optimized.
_native_
This selects the CPU to tune for at compilation time by
determining the processor type of the compiling machine.
Using '-mtune=native' will produce code optimized for the
local machine under the constraints of the selected
instruction set. Using '-march=native' will enable all
instruction subsets supported by the local machine (hence the
result might not run on different machines).
_i386_
Original Intel's i386 CPU.
_i486_
Intel's i486 CPU. (No scheduling is implemented for this
chip.)
_i586, pentium_
Intel Pentium CPU with no MMX support.
_pentium-mmx_
Intel PentiumMMX CPU based on Pentium core with MMX
instruction set support.
_pentiumpro_
Intel PentiumPro CPU.
_i686_
Same as 'generic', but when used as 'march' option, PentiumPro
instruction set will be used, so the code will run on all i686
family chips.
_pentium2_
Intel Pentium2 CPU based on PentiumPro core with MMX
instruction set support.
_pentium3, pentium3m_
Intel Pentium3 CPU based on PentiumPro core with MMX and SSE
instruction set support.
_pentium-m_
Low power version of Intel Pentium3 CPU with MMX, SSE and SSE2
instruction set support. Used by Centrino notebooks.
_pentium4, pentium4m_
Intel Pentium4 CPU with MMX, SSE and SSE2 instruction set
support.
_prescott_
Improved version of Intel Pentium4 CPU with MMX, SSE, SSE2 and
SSE3 instruction set support.
_nocona_
Improved version of Intel Pentium4 CPU with 64-bit extensions,
MMX, SSE, SSE2 and SSE3 instruction set support.
_core2_
Intel Core2 CPU with 64-bit extensions, MMX, SSE, SSE2, SSE3
and SSSE3 instruction set support.
_k6_
AMD K6 CPU with MMX instruction set support.
_k6-2, k6-3_
Improved versions of AMD K6 CPU with MMX and 3dNOW!
instruction set support.
_athlon, athlon-tbird_
AMD Athlon CPU with MMX, 3dNOW!, enhanced 3dNOW! and SSE
prefetch instructions support.
_athlon-4, athlon-xp, athlon-mp_
Improved AMD Athlon CPU with MMX, 3dNOW!, enhanced 3dNOW! and
full SSE instruction set support.
_k8, opteron, athlon64, athlon-fx_
AMD K8 core based CPUs with x86-64 instruction set support.
(This supersets MMX, SSE, SSE2, 3dNOW!, enhanced 3dNOW! and
64-bit instruction set extensions.)
_k8-sse3, opteron-sse3, athlon64-sse3_
Improved versions of k8, opteron and athlon64 with SSE3
instruction set support.
_amdfam10, barcelona_
AMD Family 10h core based CPUs with x86-64 instruction set
support. (This supersets MMX, SSE, SSE2, SSE3, SSE4A, 3dNOW!,
enhanced 3dNOW!, ABM and 64-bit instruction set extensions.)
_winchip-c6_
IDT Winchip C6 CPU, dealt in same way as i486 with additional
MMX instruction set support.
_winchip2_
IDT Winchip2 CPU, dealt in same way as i486 with additional
MMX and 3dNOW! instruction set support.
_c3_
Via C3 CPU with MMX and 3dNOW! instruction set support. (No
scheduling is implemented for this chip.)
_c3-2_
Via C3-2 CPU with MMX and SSE instruction set support. (No
scheduling is implemented for this chip.)
_geode_
Embedded AMD CPU with MMX and 3dNOW! instruction set support.
While picking a specific CPU-TYPE will schedule things
appropriately for that particular chip, the compiler will not
generate any code that does not run on the i386 without the
'-march=CPU-TYPE' option being used.
'-march=CPU-TYPE'
Generate instructions for the machine type CPU-TYPE. The choices
for CPU-TYPE are the same as for '-mtune'. Moreover, specifying
'-march=CPU-TYPE' implies '-mtune=CPU-TYPE'.
'-mcpu=CPU-TYPE'
A deprecated synonym for '-mtune'.
'-mfpmath=UNIT'
Generate floating point arithmetics for selected unit UNIT. The
choices for UNIT are:
'387'
Use the standard 387 floating point coprocessor present
majority of chips and emulated otherwise. Code compiled with
this option will run almost everywhere. The temporary results
are computed in 80bit precision instead of precision specified
by the type resulting in slightly different results compared
to most of other chips. See '-ffloat-store' for more detailed
description.
This is the default choice for i386 compiler.
'sse'
Use scalar floating point instructions present in the SSE
instruction set. This instruction set is supported by
Pentium3 and newer chips, in the AMD line by Athlon-4,
Athlon-xp and Athlon-mp chips. The earlier version of SSE
instruction set supports only single precision arithmetics,
thus the double and extended precision arithmetics is still
done using 387. Later version, present only in Pentium4 and
the future AMD x86-64 chips supports double precision
arithmetics too.
For the i386 compiler, you need to use '-march=CPU-TYPE',
'-msse' or '-msse2' switches to enable SSE extensions and make
this option effective. For the x86-64 compiler, these
extensions are enabled by default.
The resulting code should be considerably faster in the
majority of cases and avoid the numerical instability problems
of 387 code, but may break some existing code that expects
temporaries to be 80bit.
This is the default choice for the x86-64 compiler.
'sse,387'
Attempt to utilize both instruction sets at once. This
effectively double the amount of available registers and on
chips with separate execution units for 387 and SSE the
execution resources too. Use this option with care, as it is
still experimental, because the GCC register allocator does
not model separate functional units well resulting in instable
performance.
'-masm=DIALECT'
Output asm instructions using selected DIALECT. Supported choices
are 'intel' or 'att' (the default one). Darwin does not support
'intel'.
'-mieee-fp'
'-mno-ieee-fp'
Control whether or not the compiler uses IEEE floating point
comparisons. These handle correctly the case where the result of a
comparison is unordered.
'-msoft-float'
Generate output containing library calls for floating point.
*Warning:* the requisite libraries are not part of GCC. Normally
the facilities of the machine's usual C compiler are used, but this
can't be done directly in cross-compilation. You must make your
own arrangements to provide suitable library functions for
cross-compilation.
On machines where a function returns floating point results in the
80387 register stack, some floating point opcodes may be emitted
even if '-msoft-float' is used.
'-mno-fp-ret-in-387'
Do not use the FPU registers for return values of functions.
The usual calling convention has functions return values of types
'float' and 'double' in an FPU register, even if there is no FPU.
The idea is that the operating system should emulate an FPU.
The option '-mno-fp-ret-in-387' causes such values to be returned
in ordinary CPU registers instead.
'-mno-fancy-math-387'
Some 387 emulators do not support the 'sin', 'cos' and 'sqrt'
instructions for the 387. Specify this option to avoid generating
those instructions. This option is the default on FreeBSD, OpenBSD
and NetBSD. This option is overridden when '-march' indicates that
the target cpu will always have an FPU and so the instruction will
not need emulation. As of revision 2.6.1, these instructions are
not generated unless you also use the '-funsafe-math-optimizations'
switch.
'-malign-double'
'-mno-align-double'
Control whether GCC aligns 'double', 'long double', and 'long long'
variables on a two word boundary or a one word boundary. Aligning
'double' variables on a two word boundary will produce code that
runs somewhat faster on a 'Pentium' at the expense of more memory.
On x86-64, '-malign-double' is enabled by default.
*Warning:* if you use the '-malign-double' switch, structures
containing the above types will be aligned differently than the
published application binary interface specifications for the 386
and will not be binary compatible with structures in code compiled
without that switch.
'-m96bit-long-double'
'-m128bit-long-double'
These switches control the size of 'long double' type. The i386
application binary interface specifies the size to be 96 bits, so
'-m96bit-long-double' is the default in 32 bit mode.
Modern architectures (Pentium and newer) would prefer 'long double'
to be aligned to an 8 or 16 byte boundary. In arrays or structures
conforming to the ABI, this would not be possible. So specifying a
'-m128bit-long-double' will align 'long double' to a 16 byte
boundary by padding the 'long double' with an additional 32 bit
zero.
In the x86-64 compiler, '-m128bit-long-double' is the default
choice as its ABI specifies that 'long double' is to be aligned on
16 byte boundary.
Notice that neither of these options enable any extra precision
over the x87 standard of 80 bits for a 'long double'.
*Warning:* if you override the default value for your target ABI,
the structures and arrays containing 'long double' variables will
change their size as well as function calling convention for
function taking 'long double' will be modified. Hence they will
not be binary compatible with arrays or structures in code compiled
without that switch.
'-mmlarge-data-threshold=NUMBER'
When '-mcmodel=medium' is specified, the data greater than
THRESHOLD are placed in large data section. This value must be the
same across all object linked into the binary and defaults to
65535.
'-mrtd'
Use a different function-calling convention, in which functions
that take a fixed number of arguments return with the 'ret' NUM
instruction, which pops their arguments while returning. This
saves one instruction in the caller since there is no need to pop
the arguments there.
You can specify that an individual function is called with this
calling sequence with the function attribute 'stdcall'. You can
also override the '-mrtd' option by using the function attribute
'cdecl'. *Note Function Attributes::.
*Warning:* this calling convention is incompatible with the one
normally used on Unix, so you cannot use it if you need to call
libraries compiled with the Unix compiler.
Also, you must provide function prototypes for all functions that
take variable numbers of arguments (including 'printf'); otherwise
incorrect code will be generated for calls to those functions.
In addition, seriously incorrect code will result if you call a
function with too many arguments. (Normally, extra arguments are
harmlessly ignored.)
'-mregparm=NUM'
Control how many registers are used to pass integer arguments. By
default, no registers are used to pass arguments, and at most 3
registers can be used. You can control this behavior for a
specific function by using the function attribute 'regparm'. *Note
Function Attributes::.
*Warning:* if you use this switch, and NUM is nonzero, then you
must build all modules with the same value, including any
libraries. This includes the system libraries and startup modules.
'-msseregparm'
Use SSE register passing conventions for float and double arguments
and return values. You can control this behavior for a specific
function by using the function attribute 'sseregparm'. *Note
Function Attributes::.
*Warning:* if you use this switch then you must build all modules
with the same value, including any libraries. This includes the
system libraries and startup modules.
'-mpc32'
'-mpc64'
'-mpc80'
Set 80387 floating-point precision to 32, 64 or 80 bits. When
'-mpc32' is specified, the significands of results of
floating-point operations are rounded to 24 bits (single
precision); '-mpc64' rounds the the significands of results of
floating-point operations to 53 bits (double precision) and
'-mpc80' rounds the significands of results of floating-point
operations to 64 bits (extended double precision), which is the
default. When this option is used, floating-point operations in
higher precisions are not available to the programmer without
setting the FPU control word explicitly.
Setting the rounding of floating-point operations to less than the
default 80 bits can speed some programs by 2% or more. Note that
some mathematical libraries assume that extended precision (80 bit)
floating-point operations are enabled by default; routines in such
libraries could suffer significant loss of accuracy, typically
through so-called "catastrophic cancellation", when this option is
used to set the precision to less than extended precision.
'-mstackrealign'
Realign the stack at entry. On the Intel x86, the '-mstackrealign'
option will generate an alternate prologue and epilogue that
realigns the runtime stack. This supports mixing legacy codes that
keep a 4-byte aligned stack with modern codes that keep a 16-byte
stack for SSE compatibility. The alternate prologue and epilogue
are slower and bigger than the regular ones, and the alternate
prologue requires an extra scratch register; this lowers the number
of registers available if used in conjunction with the 'regparm'
attribute. The '-mstackrealign' option is incompatible with the
nested function prologue; this is considered a hard error. See
also the attribute 'force_align_arg_pointer', applicable to
individual functions.
'-mpreferred-stack-boundary=NUM'
Attempt to keep the stack boundary aligned to a 2 raised to NUM
byte boundary. If '-mpreferred-stack-boundary' is not specified,
the default is 4 (16 bytes or 128 bits).
On Pentium and PentiumPro, 'double' and 'long double' values should
be aligned to an 8 byte boundary (see '-malign-double') or suffer
significant run time performance penalties. On Pentium III, the
Streaming SIMD Extension (SSE) data type '__m128' may not work
properly if it is not 16 byte aligned.
To ensure proper alignment of this values on the stack, the stack
boundary must be as aligned as that required by any value stored on
the stack. Further, every function must be generated such that it
keeps the stack aligned. Thus calling a function compiled with a
higher preferred stack boundary from a function compiled with a
lower preferred stack boundary will most likely misalign the stack.
It is recommended that libraries that use callbacks always use the
default setting.
This extra alignment does consume extra stack space, and generally
increases code size. Code that is sensitive to stack space usage,
such as embedded systems and operating system kernels, may want to
reduce the preferred alignment to '-mpreferred-stack-boundary=2'.
'-mmmx'
'-mno-mmx'
'-msse'
'-mno-sse'
'-msse2'
'-mno-sse2'
'-msse3'
'-mno-sse3'
'-mssse3'
'-mno-ssse3'
'-msse4.1'
'-mno-sse4.1'
'-msse4.2'
'-mno-sse4.2'
'-msse4'
'-mno-sse4'
'-msse4a'
'-mno-sse4a'
'-msse5'
'-mno-sse5'
'-m3dnow'
'-mno-3dnow'
'-mpopcnt'
'-mno-popcnt'
'-mabm'
'-mno-abm'
These switches enable or disable the use of instructions in the
MMX, SSE, SSE2, SSE3, SSSE3, SSE4.1, SSE4A, SSE5, ABM or 3DNow!
extended instruction sets. These extensions are also available as
built-in functions: see *note X86 Built-in Functions::, for details
of the functions enabled and disabled by these switches.
To have SSE/SSE2 instructions generated automatically from
floating-point code (as opposed to 387 instructions), see
'-mfpmath=sse'.
These options will enable GCC to use these extended instructions in
generated code, even without '-mfpmath=sse'. Applications which
perform runtime CPU detection must compile separate files for each
supported architecture, using the appropriate flags. In
particular, the file containing the CPU detection code should be
compiled without these options.
'-mcld'
This option instructs GCC to emit a 'cld' instruction in the
prologue of functions that use string instructions. String
instructions depend on the DF flag to select between autoincrement
or autodecrement mode. While the ABI specifies the DF flag to be
cleared on function entry, some operating systems violate this
specification by not clearing the DF flag in their exception
dispatchers. The exception handler can be invoked with the DF flag
set which leads to wrong direction mode, when string instructions
are used. This option can be enabled by default on 32-bit x86
targets by configuring GCC with the '--enable-cld' configure
option. Generation of 'cld' instructions can be suppressed with
the '-mno-cld' compiler option in this case.
'-mcx16'
This option will enable GCC to use CMPXCHG16B instruction in
generated code. CMPXCHG16B allows for atomic operations on 128-bit
double quadword (or oword) data types. This is useful for high
resolution counters that could be updated by multiple processors
(or cores). This instruction is generated as part of atomic
built-in functions: see *note Atomic Builtins:: for details.
'-msahf'
This option will enable GCC to use SAHF instruction in generated
64-bit code. Early Intel CPUs with Intel 64 lacked LAHF and SAHF
instructions supported by AMD64 until introduction of Pentium 4 G1
step in December 2005. LAHF and SAHF are load and store
instructions, respectively, for certain status flags. In 64-bit
mode, SAHF instruction is used to optimize 'fmod', 'drem' or
'remainder' built-in functions: see *note Other Builtins:: for
details.
'-mrecip'
This option will enable GCC to use RCPSS and RSQRTSS instructions
(and their vectorized variants RCPPS and RSQRTPS) with an
additional Newton-Rhapson step to increase precision instead of
DIVSS and SQRTSS (and their vectorized variants) for single
precision floating point arguments. These instructions are
generated only when '-funsafe-math-optimizations' is enabled
together with '-finite-math-only' and '-fno-trapping-math'. Note
that while the throughput of the sequence is higher than the
throughput of the non-reciprocal instruction, the precision of the
sequence can be decreased by up to 2 ulp (i.e. the inverse of 1.0
equals 0.99999994).
'-mveclibabi=TYPE'
Specifies the ABI type to use for vectorizing intrinsics using an
external library. Supported types are 'acml' for the AMD math core
library style of interfacing. GCC will currently emit calls to
'__vrd2_sin', '__vrd2_cos', '__vrd2_exp', '__vrd2_log',
'__vrd2_log2', '__vrd2_log10', '__vrs4_sinf', '__vrs4_cosf',
'__vrs4_expf', '__vrs4_logf', '__vrs4_log2f', '__vrs4_log10f' and
'__vrs4_powf' when using this type and '-ftree-vectorize' is
enabled. A ACML ABI compatible library will have to be specified
at link time.
'-mpush-args'
'-mno-push-args'
Use PUSH operations to store outgoing parameters. This method is
shorter and usually equally fast as method using SUB/MOV operations
and is enabled by default. In some cases disabling it may improve
performance because of improved scheduling and reduced
dependencies.
'-maccumulate-outgoing-args'
If enabled, the maximum amount of space required for outgoing
arguments will be computed in the function prologue. This is
faster on most modern CPUs because of reduced dependencies,
improved scheduling and reduced stack usage when preferred stack
boundary is not equal to 2. The drawback is a notable increase in
code size. This switch implies '-mno-push-args'.
'-mthreads'
Support thread-safe exception handling on 'Mingw32'. Code that
relies on thread-safe exception handling must compile and link all
code with the '-mthreads' option. When compiling, '-mthreads'
defines '-D_MT'; when linking, it links in a special thread helper
library '-lmingwthrd' which cleans up per thread exception handling
data.
'-mno-align-stringops'
Do not align destination of inlined string operations. This switch
reduces code size and improves performance in case the destination
is already aligned, but GCC doesn't know about it.
'-minline-all-stringops'
By default GCC inlines string operations only when destination is
known to be aligned at least to 4 byte boundary. This enables more
inlining, increase code size, but may improve performance of code
that depends on fast memcpy, strlen and memset for short lengths.
'-minline-stringops-dynamically'
For string operation of unknown size, inline runtime checks so for
small blocks inline code is used, while for large blocks library
call is used.
'-mstringop-strategy=ALG'
Overwrite internal decision heuristic about particular algorithm to
inline string operation with. The allowed values are 'rep_byte',
'rep_4byte', 'rep_8byte' for expanding using i386 'rep' prefix of
specified size, 'byte_loop', 'loop', 'unrolled_loop' for expanding
inline loop, 'libcall' for always expanding library call.
'-momit-leaf-frame-pointer'
Don't keep the frame pointer in a register for leaf functions.
This avoids the instructions to save, set up and restore frame
pointers and makes an extra register available in leaf functions.
The option '-fomit-frame-pointer' removes the frame pointer for all
functions which might make debugging harder.
'-mtls-direct-seg-refs'
'-mno-tls-direct-seg-refs'
Controls whether TLS variables may be accessed with offsets from
the TLS segment register ('%gs' for 32-bit, '%fs' for 64-bit), or
whether the thread base pointer must be added. Whether or not this
is legal depends on the operating system, and whether it maps the
segment to cover the entire TLS area.
For systems that use GNU libc, the default is on.
'-mfused-madd'
'-mno-fused-madd'
Enable automatic generation of fused floating point multiply-add
instructions if the ISA supports such instructions. The
-mfused-madd option is on by default. The fused multiply-add
instructions have a different rounding behavior compared to
executing a multiply followed by an add.
These '-m' switches are supported in addition to the above on AMD
x86-64 processors in 64-bit environments.
'-m32'
'-m64'
Generate code for a 32-bit or 64-bit environment. The 32-bit
environment sets int, long and pointer to 32 bits and generates
code that runs on any i386 system. The 64-bit environment sets int
to 32 bits and long and pointer to 64 bits and generates code for
AMD's x86-64 architecture. For darwin only the -m64 option turns
off the '-fno-pic' and '-mdynamic-no-pic' options.
'-mno-red-zone'
Do not use a so called red zone for x86-64 code. The red zone is
mandated by the x86-64 ABI, it is a 128-byte area beyond the
location of the stack pointer that will not be modified by signal
or interrupt handlers and therefore can be used for temporary data
without adjusting the stack pointer. The flag '-mno-red-zone'
disables this red zone.
'-mcmodel=small'
Generate code for the small code model: the program and its symbols
must be linked in the lower 2 GB of the address space. Pointers
are 64 bits. Programs can be statically or dynamically linked.
This is the default code model.
'-mcmodel=kernel'
Generate code for the kernel code model. The kernel runs in the
negative 2 GB of the address space. This model has to be used for
Linux kernel code.
'-mcmodel=medium'
Generate code for the medium model: The program is linked in the
lower 2 GB of the address space but symbols can be located anywhere
in the address space. Programs can be statically or dynamically
linked, but building of shared libraries are not supported with the
medium model.
'-mcmodel=large'
Generate code for the large model: This model makes no assumptions
about addresses and sizes of sections.

File: gcc.info, Node: IA-64 Options, Next: M32C Options, Prev: i386 and x86-64 Options, Up: Submodel Options
3.17.15 IA-64 Options
---------------------
These are the '-m' options defined for the Intel IA-64 architecture.
'-mbig-endian'
Generate code for a big endian target. This is the default for
HP-UX.
'-mlittle-endian'
Generate code for a little endian target. This is the default for
AIX5 and GNU/Linux.
'-mgnu-as'
'-mno-gnu-as'
Generate (or don't) code for the GNU assembler. This is the
default.
'-mgnu-ld'
'-mno-gnu-ld'
Generate (or don't) code for the GNU linker. This is the default.
'-mno-pic'
Generate code that does not use a global pointer register. The
result is not position independent code, and violates the IA-64
ABI.
'-mvolatile-asm-stop'
'-mno-volatile-asm-stop'
Generate (or don't) a stop bit immediately before and after
volatile asm statements.
'-mregister-names'
'-mno-register-names'
Generate (or don't) 'in', 'loc', and 'out' register names for the
stacked registers. This may make assembler output more readable.
'-mno-sdata'
'-msdata'
Disable (or enable) optimizations that use the small data section.
This may be useful for working around optimizer bugs.
'-mconstant-gp'
Generate code that uses a single constant global pointer value.
This is useful when compiling kernel code.
'-mauto-pic'
Generate code that is self-relocatable. This implies
'-mconstant-gp'. This is useful when compiling firmware code.
'-minline-float-divide-min-latency'
Generate code for inline divides of floating point values using the
minimum latency algorithm.
'-minline-float-divide-max-throughput'
Generate code for inline divides of floating point values using the
maximum throughput algorithm.
'-minline-int-divide-min-latency'
Generate code for inline divides of integer values using the
minimum latency algorithm.
'-minline-int-divide-max-throughput'
Generate code for inline divides of integer values using the
maximum throughput algorithm.
'-minline-sqrt-min-latency'
Generate code for inline square roots using the minimum latency
algorithm.
'-minline-sqrt-max-throughput'
Generate code for inline square roots using the maximum throughput
algorithm.
'-mno-dwarf2-asm'
'-mdwarf2-asm'
Don't (or do) generate assembler code for the DWARF2 line number
debugging info. This may be useful when not using the GNU
assembler.
'-mearly-stop-bits'
'-mno-early-stop-bits'
Allow stop bits to be placed earlier than immediately preceding the
instruction that triggered the stop bit. This can improve
instruction scheduling, but does not always do so.
'-mfixed-range=REGISTER-RANGE'
Generate code treating the given register range as fixed registers.
A fixed register is one that the register allocator can not use.
This is useful when compiling kernel code. A register range is
specified as two registers separated by a dash. Multiple register
ranges can be specified separated by a comma.
'-mtls-size=TLS-SIZE'
Specify bit size of immediate TLS offsets. Valid values are 14,
22, and 64.
'-mtune=CPU-TYPE'
Tune the instruction scheduling for a particular CPU, Valid values
are itanium, itanium1, merced, itanium2, and mckinley.
'-mt'
'-pthread'
Add support for multithreading using the POSIX threads library.
This option sets flags for both the preprocessor and linker. It
does not affect the thread safety of object code produced by the
compiler or that of libraries supplied with it. These are HP-UX
specific flags.
'-milp32'
'-mlp64'
Generate code for a 32-bit or 64-bit environment. The 32-bit
environment sets int, long and pointer to 32 bits. The 64-bit
environment sets int to 32 bits and long and pointer to 64 bits.
These are HP-UX specific flags.
'-mno-sched-br-data-spec'
'-msched-br-data-spec'
(Dis/En)able data speculative scheduling before reload. This will
result in generation of the ld.a instructions and the corresponding
check instructions (ld.c / chk.a). The default is 'disable'.
'-msched-ar-data-spec'
'-mno-sched-ar-data-spec'
(En/Dis)able data speculative scheduling after reload. This will
result in generation of the ld.a instructions and the corresponding
check instructions (ld.c / chk.a). The default is 'enable'.
'-mno-sched-control-spec'
'-msched-control-spec'
(Dis/En)able control speculative scheduling. This feature is
available only during region scheduling (i.e. before reload). This
will result in generation of the ld.s instructions and the
corresponding check instructions chk.s . The default is 'disable'.
'-msched-br-in-data-spec'
'-mno-sched-br-in-data-spec'
(En/Dis)able speculative scheduling of the instructions that are
dependent on the data speculative loads before reload. This is
effective only with '-msched-br-data-spec' enabled. The default is
'enable'.
'-msched-ar-in-data-spec'
'-mno-sched-ar-in-data-spec'
(En/Dis)able speculative scheduling of the instructions that are
dependent on the data speculative loads after reload. This is
effective only with '-msched-ar-data-spec' enabled. The default is
'enable'.
'-msched-in-control-spec'
'-mno-sched-in-control-spec'
(En/Dis)able speculative scheduling of the instructions that are
dependent on the control speculative loads. This is effective only
with '-msched-control-spec' enabled. The default is 'enable'.
'-msched-ldc'
'-mno-sched-ldc'
(En/Dis)able use of simple data speculation checks ld.c . If
disabled, only chk.a instructions will be emitted to check data
speculative loads. The default is 'enable'.
'-mno-sched-control-ldc'
'-msched-control-ldc'
(Dis/En)able use of ld.c instructions to check control speculative
loads. If enabled, in case of control speculative load with no
speculatively scheduled dependent instructions this load will be
emitted as ld.sa and ld.c will be used to check it. The default is
'disable'.
'-mno-sched-spec-verbose'
'-msched-spec-verbose'
(Dis/En)able printing of the information about speculative motions.
'-mno-sched-prefer-non-data-spec-insns'
'-msched-prefer-non-data-spec-insns'
If enabled, data speculative instructions will be chosen for
schedule only if there are no other choices at the moment. This
will make the use of the data speculation much more conservative.
The default is 'disable'.
'-mno-sched-prefer-non-control-spec-insns'
'-msched-prefer-non-control-spec-insns'
If enabled, control speculative instructions will be chosen for
schedule only if there are no other choices at the moment. This
will make the use of the control speculation much more
conservative. The default is 'disable'.
'-mno-sched-count-spec-in-critical-path'
'-msched-count-spec-in-critical-path'
If enabled, speculative dependencies will be considered during
computation of the instructions priorities. This will make the use
of the speculation a bit more conservative. The default is
'disable'.

File: gcc.info, Node: M32C Options, Next: M32R/D Options, Prev: IA-64 Options, Up: Submodel Options
3.17.16 M32C Options
--------------------
'-mcpu=NAME'
Select the CPU for which code is generated. NAME may be one of
'r8c' for the R8C/Tiny series, 'm16c' for the M16C (up to /60)
series, 'm32cm' for the M16C/80 series, or 'm32c' for the M32C/80
series.
'-msim'
Specifies that the program will be run on the simulator. This
causes an alternate runtime library to be linked in which supports,
for example, file I/O. You must not use this option when
generating programs that will run on real hardware; you must
provide your own runtime library for whatever I/O functions are
needed.
'-memregs=NUMBER'
Specifies the number of memory-based pseudo-registers GCC will use
during code generation. These pseudo-registers will be used like
real registers, so there is a tradeoff between GCC's ability to fit
the code into available registers, and the performance penalty of
using memory instead of registers. Note that all modules in a
program must be compiled with the same value for this option.
Because of that, you must not use this option with the default
runtime libraries gcc builds.

File: gcc.info, Node: M32R/D Options, Next: M680x0 Options, Prev: M32C Options, Up: Submodel Options
3.17.17 M32R/D Options
----------------------
These '-m' options are defined for Renesas M32R/D architectures:
'-m32r2'
Generate code for the M32R/2.
'-m32rx'
Generate code for the M32R/X.
'-m32r'
Generate code for the M32R. This is the default.
'-mmodel=small'
Assume all objects live in the lower 16MB of memory (so that their
addresses can be loaded with the 'ld24' instruction), and assume
all subroutines are reachable with the 'bl' instruction. This is
the default.
The addressability of a particular object can be set with the
'model' attribute.
'-mmodel=medium'
Assume objects may be anywhere in the 32-bit address space (the
compiler will generate 'seth/add3' instructions to load their
addresses), and assume all subroutines are reachable with the 'bl'
instruction.
'-mmodel=large'
Assume objects may be anywhere in the 32-bit address space (the
compiler will generate 'seth/add3' instructions to load their
addresses), and assume subroutines may not be reachable with the
'bl' instruction (the compiler will generate the much slower
'seth/add3/jl' instruction sequence).
'-msdata=none'
Disable use of the small data area. Variables will be put into one
of '.data', 'bss', or '.rodata' (unless the 'section' attribute has
been specified). This is the default.
The small data area consists of sections '.sdata' and '.sbss'.
Objects may be explicitly put in the small data area with the
'section' attribute using one of these sections.
'-msdata=sdata'
Put small global and static data in the small data area, but do not
generate special code to reference them.
'-msdata=use'
Put small global and static data in the small data area, and
generate special instructions to reference them.
'-G NUM'
Put global and static objects less than or equal to NUM bytes into
the small data or bss sections instead of the normal data or bss
sections. The default value of NUM is 8. The '-msdata' option
must be set to one of 'sdata' or 'use' for this option to have any
effect.
All modules should be compiled with the same '-G NUM' value.
Compiling with different values of NUM may or may not work; if it
doesn't the linker will give an error message--incorrect code will
not be generated.
'-mdebug'
Makes the M32R specific code in the compiler display some
statistics that might help in debugging programs.
'-malign-loops'
Align all loops to a 32-byte boundary.
'-mno-align-loops'
Do not enforce a 32-byte alignment for loops. This is the default.
'-missue-rate=NUMBER'
Issue NUMBER instructions per cycle. NUMBER can only be 1 or 2.
'-mbranch-cost=NUMBER'
NUMBER can only be 1 or 2. If it is 1 then branches will be
preferred over conditional code, if it is 2, then the opposite will
apply.
'-mflush-trap=NUMBER'
Specifies the trap number to use to flush the cache. The default
is 12. Valid numbers are between 0 and 15 inclusive.
'-mno-flush-trap'
Specifies that the cache cannot be flushed by using a trap.
'-mflush-func=NAME'
Specifies the name of the operating system function to call to
flush the cache. The default is __flush_cache_, but a function
call will only be used if a trap is not available.
'-mno-flush-func'
Indicates that there is no OS function for flushing the cache.

File: gcc.info, Node: M680x0 Options, Next: M68hc1x Options, Prev: M32R/D Options, Up: Submodel Options
3.17.18 M680x0 Options
----------------------
These are the '-m' options defined for M680x0 and ColdFire processors.
The default settings depend on which architecture was selected when the
compiler was configured; the defaults for the most common choices are
given below.
'-march=ARCH'
Generate code for a specific M680x0 or ColdFire instruction set
architecture. Permissible values of ARCH for M680x0 architectures
are: '68000', '68010', '68020', '68030', '68040', '68060' and
'cpu32'. ColdFire architectures are selected according to
Freescale's ISA classification and the permissible values are:
'isaa', 'isaaplus', 'isab' and 'isac'.
gcc defines a macro '__mcfARCH__' whenever it is generating code
for a ColdFire target. The ARCH in this macro is one of the
'-march' arguments given above.
When used together, '-march' and '-mtune' select code that runs on
a family of similar processors but that is optimized for a
particular microarchitecture.
'-mcpu=CPU'
Generate code for a specific M680x0 or ColdFire processor. The
M680x0 CPUs are: '68000', '68010', '68020', '68030', '68040',
'68060', '68302', '68332' and 'cpu32'. The ColdFire CPUs are given
by the table below, which also classifies the CPUs into families:
*Family* *'-mcpu' arguments*
'51qe' '51qe'
'5206' '5202' '5204' '5206'
'5206e' '5206e'
'5208' '5207' '5208'
'5211a' '5210a' '5211a'
'5213' '5211' '5212' '5213'
'5216' '5214' '5216'
'52235' '52230' '52231' '52232' '52233' '52234' '52235'
'5225' '5224' '5225'
'5235' '5232' '5233' '5234' '5235' '523x'
'5249' '5249'
'5250' '5250'
'5271' '5270' '5271'
'5272' '5272'
'5275' '5274' '5275'
'5282' '5280' '5281' '5282' '528x'
'5307' '5307'
'5329' '5327' '5328' '5329' '532x'
'5373' '5372' '5373' '537x'
'5407' '5407'
'5475' '5470' '5471' '5472' '5473' '5474' '5475' '547x' '5480'
'5481' '5482' '5483' '5484' '5485'
'-mcpu=CPU' overrides '-march=ARCH' if ARCH is compatible with CPU.
Other combinations of '-mcpu' and '-march' are rejected.
gcc defines the macro '__mcf_cpu_CPU' when ColdFire target CPU is
selected. It also defines '__mcf_family_FAMILY', where the value
of FAMILY is given by the table above.
'-mtune=TUNE'
Tune the code for a particular microarchitecture, within the
constraints set by '-march' and '-mcpu'. The M680x0
microarchitectures are: '68000', '68010', '68020', '68030',
'68040', '68060' and 'cpu32'. The ColdFire microarchitectures are:
'cfv1', 'cfv2', 'cfv3', 'cfv4' and 'cfv4e'.
You can also use '-mtune=68020-40' for code that needs to run
relatively well on 68020, 68030 and 68040 targets.
'-mtune=68020-60' is similar but includes 68060 targets as well.
These two options select the same tuning decisions as '-m68020-40'
and '-m68020-60' respectively.
gcc defines the macros '__mcARCH' and '__mcARCH__' when tuning for
680x0 architecture ARCH. It also defines 'mcARCH' unless either
'-ansi' or a non-GNU '-std' option is used. If gcc is tuning for a
range of architectures, as selected by '-mtune=68020-40' or
'-mtune=68020-60', it defines the macros for every architecture in
the range.
gcc also defines the macro '__mUARCH__' when tuning for ColdFire
microarchitecture UARCH, where UARCH is one of the arguments given
above.
'-m68000'
'-mc68000'
Generate output for a 68000. This is the default when the compiler
is configured for 68000-based systems. It is equivalent to
'-march=68000'.
Use this option for microcontrollers with a 68000 or EC000 core,
including the 68008, 68302, 68306, 68307, 68322, 68328 and 68356.
'-m68010'
Generate output for a 68010. This is the default when the compiler
is configured for 68010-based systems. It is equivalent to
'-march=68010'.
'-m68020'
'-mc68020'
Generate output for a 68020. This is the default when the compiler
is configured for 68020-based systems. It is equivalent to
'-march=68020'.
'-m68030'
Generate output for a 68030. This is the default when the compiler
is configured for 68030-based systems. It is equivalent to
'-march=68030'.
'-m68040'
Generate output for a 68040. This is the default when the compiler
is configured for 68040-based systems. It is equivalent to
'-march=68040'.
This option inhibits the use of 68881/68882 instructions that have
to be emulated by software on the 68040. Use this option if your
68040 does not have code to emulate those instructions.
'-m68060'
Generate output for a 68060. This is the default when the compiler
is configured for 68060-based systems. It is equivalent to
'-march=68060'.
This option inhibits the use of 68020 and 68881/68882 instructions
that have to be emulated by software on the 68060. Use this option
if your 68060 does not have code to emulate those instructions.
'-mcpu32'
Generate output for a CPU32. This is the default when the compiler
is configured for CPU32-based systems. It is equivalent to
'-march=cpu32'.
Use this option for microcontrollers with a CPU32 or CPU32+ core,
including the 68330, 68331, 68332, 68333, 68334, 68336, 68340,
68341, 68349 and 68360.
'-m5200'
Generate output for a 520X ColdFire CPU. This is the default when
the compiler is configured for 520X-based systems. It is
equivalent to '-mcpu=5206', and is now deprecated in favor of that
option.
Use this option for microcontroller with a 5200 core, including the
MCF5202, MCF5203, MCF5204 and MCF5206.
'-m5206e'
Generate output for a 5206e ColdFire CPU. The option is now
deprecated in favor of the equivalent '-mcpu=5206e'.
'-m528x'
Generate output for a member of the ColdFire 528X family. The
option is now deprecated in favor of the equivalent '-mcpu=528x'.
'-m5307'
Generate output for a ColdFire 5307 CPU. The option is now
deprecated in favor of the equivalent '-mcpu=5307'.
'-m5407'
Generate output for a ColdFire 5407 CPU. The option is now
deprecated in favor of the equivalent '-mcpu=5407'.
'-mcfv4e'
Generate output for a ColdFire V4e family CPU (e.g. 547x/548x).
This includes use of hardware floating point instructions. The
option is equivalent to '-mcpu=547x', and is now deprecated in
favor of that option.
'-m68020-40'
Generate output for a 68040, without using any of the new
instructions. This results in code which can run relatively
efficiently on either a 68020/68881 or a 68030 or a 68040. The
generated code does use the 68881 instructions that are emulated on
the 68040.
The option is equivalent to '-march=68020' '-mtune=68020-40'.
'-m68020-60'
Generate output for a 68060, without using any of the new
instructions. This results in code which can run relatively
efficiently on either a 68020/68881 or a 68030 or a 68040. The
generated code does use the 68881 instructions that are emulated on
the 68060.
The option is equivalent to '-march=68020' '-mtune=68020-60'.
'-mhard-float'
'-m68881'
Generate floating-point instructions. This is the default for
68020 and above, and for ColdFire devices that have an FPU. It
defines the macro '__HAVE_68881__' on M680x0 targets and
'__mcffpu__' on ColdFire targets.
'-msoft-float'
Do not generate floating-point instructions; use library calls
instead. This is the default for 68000, 68010, and 68832 targets.
It is also the default for ColdFire devices that have no FPU.
'-mdiv'
'-mno-div'
Generate (do not generate) ColdFire hardware divide and remainder
instructions. If '-march' is used without '-mcpu', the default is
"on" for ColdFire architectures and "off" for M680x0 architectures.
Otherwise, the default is taken from the target CPU (either the
default CPU, or the one specified by '-mcpu'). For example, the
default is "off" for '-mcpu=5206' and "on" for '-mcpu=5206e'.
gcc defines the macro '__mcfhwdiv__' when this option is enabled.
'-mshort'
Consider type 'int' to be 16 bits wide, like 'short int'.
Additionally, parameters passed on the stack are also aligned to a
16-bit boundary even on targets whose API mandates promotion to
32-bit.
'-mno-short'
Do not consider type 'int' to be 16 bits wide. This is the
default.
'-mnobitfield'
'-mno-bitfield'
Do not use the bit-field instructions. The '-m68000', '-mcpu32'
and '-m5200' options imply '-mnobitfield'.
'-mbitfield'
Do use the bit-field instructions. The '-m68020' option implies
'-mbitfield'. This is the default if you use a configuration
designed for a 68020.
'-mrtd'
Use a different function-calling convention, in which functions
that take a fixed number of arguments return with the 'rtd'
instruction, which pops their arguments while returning. This
saves one instruction in the caller since there is no need to pop
the arguments there.
This calling convention is incompatible with the one normally used
on Unix, so you cannot use it if you need to call libraries
compiled with the Unix compiler.
Also, you must provide function prototypes for all functions that
take variable numbers of arguments (including 'printf'); otherwise
incorrect code will be generated for calls to those functions.
In addition, seriously incorrect code will result if you call a
function with too many arguments. (Normally, extra arguments are
harmlessly ignored.)
The 'rtd' instruction is supported by the 68010, 68020, 68030,
68040, 68060 and CPU32 processors, but not by the 68000 or 5200.
'-mno-rtd'
Do not use the calling conventions selected by '-mrtd'. This is
the default.
'-malign-int'
'-mno-align-int'
Control whether GCC aligns 'int', 'long', 'long long', 'float',
'double', and 'long double' variables on a 32-bit boundary
('-malign-int') or a 16-bit boundary ('-mno-align-int'). Aligning
variables on 32-bit boundaries produces code that runs somewhat
faster on processors with 32-bit busses at the expense of more
memory.
*Warning:* if you use the '-malign-int' switch, GCC will align
structures containing the above types differently than most
published application binary interface specifications for the m68k.
'-mpcrel'
Use the pc-relative addressing mode of the 68000 directly, instead
of using a global offset table. At present, this option implies
'-fpic', allowing at most a 16-bit offset for pc-relative
addressing. '-fPIC' is not presently supported with '-mpcrel',
though this could be supported for 68020 and higher processors.
'-mno-strict-align'
'-mstrict-align'
Do not (do) assume that unaligned memory references will be handled
by the system.
'-msep-data'
Generate code that allows the data segment to be located in a
different area of memory from the text segment. This allows for
execute in place in an environment without virtual memory
management. This option implies '-fPIC'.
'-mno-sep-data'
Generate code that assumes that the data segment follows the text
segment. This is the default.
'-mid-shared-library'
Generate code that supports shared libraries via the library ID
method. This allows for execute in place and shared libraries in
an environment without virtual memory management. This option
implies '-fPIC'.
'-mno-id-shared-library'
Generate code that doesn't assume ID based shared libraries are
being used. This is the default.
'-mshared-library-id=n'
Specified the identification number of the ID based shared library
being compiled. Specifying a value of 0 will generate more compact
code, specifying other values will force the allocation of that
number to the current library but is no more space or time
efficient than omitting this option.

File: gcc.info, Node: M68hc1x Options, Next: MCore Options, Prev: M680x0 Options, Up: Submodel Options
3.17.19 M68hc1x Options
-----------------------
These are the '-m' options defined for the 68hc11 and 68hc12
microcontrollers. The default values for these options depends on which
style of microcontroller was selected when the compiler was configured;
the defaults for the most common choices are given below.
'-m6811'
'-m68hc11'
Generate output for a 68HC11. This is the default when the
compiler is configured for 68HC11-based systems.
'-m6812'
'-m68hc12'
Generate output for a 68HC12. This is the default when the
compiler is configured for 68HC12-based systems.
'-m68S12'
'-m68hcs12'
Generate output for a 68HCS12.
'-mauto-incdec'
Enable the use of 68HC12 pre and post auto-increment and
auto-decrement addressing modes.
'-minmax'
'-nominmax'
Enable the use of 68HC12 min and max instructions.
'-mlong-calls'
'-mno-long-calls'
Treat all calls as being far away (near). If calls are assumed to
be far away, the compiler will use the 'call' instruction to call a
function and the 'rtc' instruction for returning.
'-mshort'
Consider type 'int' to be 16 bits wide, like 'short int'.
'-msoft-reg-count=COUNT'
Specify the number of pseudo-soft registers which are used for the
code generation. The maximum number is 32. Using more pseudo-soft
register may or may not result in better code depending on the
program. The default is 4 for 68HC11 and 2 for 68HC12.

File: gcc.info, Node: MCore Options, Next: MIPS Options, Prev: M68hc1x Options, Up: Submodel Options
3.17.20 MCore Options
---------------------
These are the '-m' options defined for the Motorola M*Core processors.
'-mhardlit'
'-mno-hardlit'
Inline constants into the code stream if it can be done in two
instructions or less.
'-mdiv'
'-mno-div'
Use the divide instruction. (Enabled by default).
'-mrelax-immediate'
'-mno-relax-immediate'
Allow arbitrary sized immediates in bit operations.
'-mwide-bitfields'
'-mno-wide-bitfields'
Always treat bit-fields as int-sized.
'-m4byte-functions'
'-mno-4byte-functions'
Force all functions to be aligned to a four byte boundary.
'-mcallgraph-data'
'-mno-callgraph-data'
Emit callgraph information.
'-mslow-bytes'
'-mno-slow-bytes'
Prefer word access when reading byte quantities.
'-mlittle-endian'
'-mbig-endian'
Generate code for a little endian target.
'-m210'
'-m340'
Generate code for the 210 processor.

File: gcc.info, Node: MIPS Options, Next: MMIX Options, Prev: MCore Options, Up: Submodel Options
3.17.21 MIPS Options
--------------------
'-EB'
Generate big-endian code.
'-EL'
Generate little-endian code. This is the default for 'mips*el-*-*'
configurations.
'-march=ARCH'
Generate code that will run on ARCH, which can be the name of a
generic MIPS ISA, or the name of a particular processor. The ISA
names are: 'mips1', 'mips2', 'mips3', 'mips4', 'mips32',
'mips32r2', and 'mips64'. The processor names are: '4kc', '4km',
'4kp', '4ksc', '4kec', '4kem', '4kep', '4ksd', '5kc', '5kf',
'20kc', '24kc', '24kf2_1', '24kf1_1', '24kec', '24kef2_1',
'24kef1_1', '34kc', '34kf2_1', '34kf1_1', '74kc', '74kf2_1',
'74kf1_1', '74kf3_2', 'm4k', 'orion', 'r2000', 'r3000', 'r3900',
'r4000', 'r4400', 'r4600', 'r4650', 'r6000', 'r8000', 'rm7000',
'rm9000', 'sb1', 'sr71000', 'vr4100', 'vr4111', 'vr4120', 'vr4130',
'vr4300', 'vr5000', 'vr5400' and 'vr5500'. The special value
'from-abi' selects the most compatible architecture for the
selected ABI (that is, 'mips1' for 32-bit ABIs and 'mips3' for
64-bit ABIs).
In processor names, a final '000' can be abbreviated as 'k' (for
example, '-march=r2k'). Prefixes are optional, and 'vr' may be
written 'r'.
Names of the form 'Nf2_1' refer to processors with FPUs clocked at
half the rate of the core, names of the form 'Nf1_1' refer to
processors with FPUs clocked at the same rate as the core, and
names of the form 'Nf3_2' refer to processors with FPUs clocked a
ratio of 3:2 with respect to the core. For compatibility reasons,
'Nf' is accepted as a synonym for 'Nf2_1' while 'Nx' and 'Bfx' are
accepted as synonyms for 'Nf1_1'.
GCC defines two macros based on the value of this option. The
first is '_MIPS_ARCH', which gives the name of target architecture,
as a string. The second has the form '_MIPS_ARCH_FOO', where FOO
is the capitalized value of '_MIPS_ARCH'. For example,
'-march=r2000' will set '_MIPS_ARCH' to '"r2000"' and define the
macro '_MIPS_ARCH_R2000'.
Note that the '_MIPS_ARCH' macro uses the processor names given
above. In other words, it will have the full prefix and will not
abbreviate '000' as 'k'. In the case of 'from-abi', the macro
names the resolved architecture (either '"mips1"' or '"mips3"').
It names the default architecture when no '-march' option is given.
'-mtune=ARCH'
Optimize for ARCH. Among other things, this option controls the
way instructions are scheduled, and the perceived cost of
arithmetic operations. The list of ARCH values is the same as for
'-march'.
When this option is not used, GCC will optimize for the processor
specified by '-march'. By using '-march' and '-mtune' together, it
is possible to generate code that will run on a family of
processors, but optimize the code for one particular member of that
family.
'-mtune' defines the macros '_MIPS_TUNE' and '_MIPS_TUNE_FOO',
which work in the same way as the '-march' ones described above.
'-mips1'
Equivalent to '-march=mips1'.
'-mips2'
Equivalent to '-march=mips2'.
'-mips3'
Equivalent to '-march=mips3'.
'-mips4'
Equivalent to '-march=mips4'.
'-mips32'
Equivalent to '-march=mips32'.
'-mips32r2'
Equivalent to '-march=mips32r2'.
'-mips64'
Equivalent to '-march=mips64'.
'-mips16'
'-mno-mips16'
Generate (do not generate) MIPS16 code. If GCC is targetting a
MIPS32 or MIPS64 architecture, it will make use of the MIPS16e ASE.
MIPS16 code generation can also be controlled on a per-function
basis by means of 'mips16' and 'nomips16' attributes. *Note
Function Attributes::, for more information.
'-mflip-mips16'
Generate MIPS16 code on alternating functions. This option is
provided for regression testing of mixed MIPS16/non-MIPS16 code
generation, and is not intended for ordinary use in compiling user
code.
'-minterlink-mips16'
'-mno-interlink-mips16'
Require (do not require) that non-MIPS16 code be link-compatible
with MIPS16 code.
For example, non-MIPS16 code cannot jump directly to MIPS16 code;
it must either use a call or an indirect jump.
'-minterlink-mips16' therefore disables direct jumps unless GCC
knows that the target of the jump is not MIPS16.
'-mabi=32'
'-mabi=o64'
'-mabi=n32'
'-mabi=64'
'-mabi=eabi'
Generate code for the given ABI.
Note that the EABI has a 32-bit and a 64-bit variant. GCC normally
generates 64-bit code when you select a 64-bit architecture, but
you can use '-mgp32' to get 32-bit code instead.
For information about the O64 ABI, see
<http://gcc.gnu.org/projects/mipso64-abi.html>.
GCC supports a variant of the o32 ABI in which floating-point
registers are 64 rather than 32 bits wide. You can select this
combination with '-mabi=32' '-mfp64'. This ABI relies on the
'mthc1' and 'mfhc1' instructions and is therefore only supported
for MIPS32R2 processors.
The register assignments for arguments and return values remain the
same, but each scalar value is passed in a single 64-bit register
rather than a pair of 32-bit registers. For example, scalar
floating-point values are returned in '$f0' only, not a '$f0'/'$f1'
pair. The set of call-saved registers also remains the same, but
all 64 bits are saved.
'-mabicalls'
'-mno-abicalls'
Generate (do not generate) code that is suitable for SVR4-style
dynamic objects. '-mabicalls' is the default for SVR4-based
systems.
'-mshared'
'-mno-shared'
Generate (do not generate) code that is fully position-independent,
and that can therefore be linked into shared libraries. This
option only affects '-mabicalls'.
All '-mabicalls' code has traditionally been position-independent,
regardless of options like '-fPIC' and '-fpic'. However, as an
extension, the GNU toolchain allows executables to use absolute
accesses for locally-binding symbols. It can also use shorter GP
initialization sequences and generate direct calls to
locally-defined functions. This mode is selected by '-mno-shared'.
'-mno-shared' depends on binutils 2.16 or higher and generates
objects that can only be linked by the GNU linker. However, the
option does not affect the ABI of the final executable; it only
affects the ABI of relocatable objects. Using '-mno-shared' will
generally make executables both smaller and quicker.
'-mshared' is the default.
'-mxgot'
'-mno-xgot'
Lift (do not lift) the usual restrictions on the size of the global
offset table.
GCC normally uses a single instruction to load values from the GOT.
While this is relatively efficient, it will only work if the GOT is
smaller than about 64k. Anything larger will cause the linker to
report an error such as:
relocation truncated to fit: R_MIPS_GOT16 foobar
If this happens, you should recompile your code with '-mxgot'. It
should then work with very large GOTs, although it will also be
less efficient, since it will take three instructions to fetch the
value of a global symbol.
Note that some linkers can create multiple GOTs. If you have such
a linker, you should only need to use '-mxgot' when a single object
file accesses more than 64k's worth of GOT entries. Very few do.
These options have no effect unless GCC is generating position
independent code.
'-mgp32'
Assume that general-purpose registers are 32 bits wide.
'-mgp64'
Assume that general-purpose registers are 64 bits wide.
'-mfp32'
Assume that floating-point registers are 32 bits wide.
'-mfp64'
Assume that floating-point registers are 64 bits wide.
'-mhard-float'
Use floating-point coprocessor instructions.
'-msoft-float'
Do not use floating-point coprocessor instructions. Implement
floating-point calculations using library calls instead.
'-msingle-float'
Assume that the floating-point coprocessor only supports
single-precision operations.
'-mdouble-float'
Assume that the floating-point coprocessor supports
double-precision operations. This is the default.
'-mllsc'
'-mno-llsc'
Use (do not use) 'll', 'sc', and 'sync' instructions to implement
atomic memory built-in functions. When neither option is
specified, GCC will use the instructions if the target architecture
supports them.
'-mllsc' is useful if the runtime environment can emulate the
instructions and '-mno-llsc' can be useful when compiling for
nonstandard ISAs. You can make either option the default by
configuring GCC with '--with-llsc' and '--without-llsc'
respectively. '--with-llsc' is the default for some
configurations; see the installation documentation for details.
'-mdsp'
'-mno-dsp'
Use (do not use) revision 1 of the MIPS DSP ASE. *Note MIPS DSP
Built-in Functions::. This option defines the preprocessor macro
'__mips_dsp'. It also defines '__mips_dsp_rev' to 1.
'-mdspr2'
'-mno-dspr2'
Use (do not use) revision 2 of the MIPS DSP ASE. *Note MIPS DSP
Built-in Functions::. This option defines the preprocessor macros
'__mips_dsp' and '__mips_dspr2'. It also defines '__mips_dsp_rev'
to 2.
'-msmartmips'
'-mno-smartmips'
Use (do not use) the MIPS SmartMIPS ASE.
'-mpaired-single'
'-mno-paired-single'
Use (do not use) paired-single floating-point instructions. *Note
MIPS Paired-Single Support::. This option requires hardware
floating-point support to be enabled.
'-mdmx'
'-mno-mdmx'
Use (do not use) MIPS Digital Media Extension instructions. This
option can only be used when generating 64-bit code and requires
hardware floating-point support to be enabled.
'-mips3d'
'-mno-mips3d'
Use (do not use) the MIPS-3D ASE. *Note MIPS-3D Built-in
Functions::. The option '-mips3d' implies '-mpaired-single'.
'-mmt'
'-mno-mt'
Use (do not use) MT Multithreading instructions.
'-mlong64'
Force 'long' types to be 64 bits wide. See '-mlong32' for an
explanation of the default and the way that the pointer size is
determined.
'-mlong32'
Force 'long', 'int', and pointer types to be 32 bits wide.
The default size of 'int's, 'long's and pointers depends on the
ABI. All the supported ABIs use 32-bit 'int's. The n64 ABI uses
64-bit 'long's, as does the 64-bit EABI; the others use 32-bit
'long's. Pointers are the same size as 'long's, or the same size
as integer registers, whichever is smaller.
'-msym32'
'-mno-sym32'
Assume (do not assume) that all symbols have 32-bit values,
regardless of the selected ABI. This option is useful in
combination with '-mabi=64' and '-mno-abicalls' because it allows
GCC to generate shorter and faster references to symbolic
addresses.
'-G NUM'
Put definitions of externally-visible data in a small data section
if that data is no bigger than NUM bytes. GCC can then access the
data more efficiently; see '-mgpopt' for details.
The default '-G' option depends on the configuration.
'-mlocal-sdata'
'-mno-local-sdata'
Extend (do not extend) the '-G' behavior to local data too, such as
to static variables in C. '-mlocal-sdata' is the default for all
configurations.
If the linker complains that an application is using too much small
data, you might want to try rebuilding the less
performance-critical parts with '-mno-local-sdata'. You might also
want to build large libraries with '-mno-local-sdata', so that the
libraries leave more room for the main program.
'-mextern-sdata'
'-mno-extern-sdata'
Assume (do not assume) that externally-defined data will be in a
small data section if that data is within the '-G' limit.
'-mextern-sdata' is the default for all configurations.
If you compile a module MOD with '-mextern-sdata' '-G NUM'
'-mgpopt', and MOD references a variable VAR that is no bigger than
NUM bytes, you must make sure that VAR is placed in a small data
section. If VAR is defined by another module, you must either
compile that module with a high-enough '-G' setting or attach a
'section' attribute to VAR's definition. If VAR is common, you
must link the application with a high-enough '-G' setting.
The easiest way of satisfying these restrictions is to compile and
link every module with the same '-G' option. However, you may wish
to build a library that supports several different small data
limits. You can do this by compiling the library with the highest
supported '-G' setting and additionally using '-mno-extern-sdata'
to stop the library from making assumptions about
externally-defined data.
'-mgpopt'
'-mno-gpopt'
Use (do not use) GP-relative accesses for symbols that are known to
be in a small data section; see '-G', '-mlocal-sdata' and
'-mextern-sdata'. '-mgpopt' is the default for all configurations.
'-mno-gpopt' is useful for cases where the '$gp' register might not
hold the value of '_gp'. For example, if the code is part of a
library that might be used in a boot monitor, programs that call
boot monitor routines will pass an unknown value in '$gp'. (In
such situations, the boot monitor itself would usually be compiled
with '-G0'.)
'-mno-gpopt' implies '-mno-local-sdata' and '-mno-extern-sdata'.
'-membedded-data'
'-mno-embedded-data'
Allocate variables to the read-only data section first if possible,
then next in the small data section if possible, otherwise in data.
This gives slightly slower code than the default, but reduces the
amount of RAM required when executing, and thus may be preferred
for some embedded systems.
'-muninit-const-in-rodata'
'-mno-uninit-const-in-rodata'
Put uninitialized 'const' variables in the read-only data section.
This option is only meaningful in conjunction with
'-membedded-data'.
'-mcode-readable=SETTING'
Specify whether GCC may generate code that reads from executable
sections. There are three possible settings:
'-mcode-readable=yes'
Instructions may freely access executable sections. This is
the default setting.
'-mcode-readable=pcrel'
MIPS16 PC-relative load instructions can access executable
sections, but other instructions must not do so. This option
is useful on 4KSc and 4KSd processors when the code TLBs have
the Read Inhibit bit set. It is also useful on processors
that can be configured to have a dual instruction/data SRAM
interface and that, like the M4K, automatically redirect
PC-relative loads to the instruction RAM.
'-mcode-readable=no'
Instructions must not access executable sections. This option
can be useful on targets that are configured to have a dual
instruction/data SRAM interface but that (unlike the M4K) do
not automatically redirect PC-relative loads to the
instruction RAM.
'-msplit-addresses'
'-mno-split-addresses'
Enable (disable) use of the '%hi()' and '%lo()' assembler
relocation operators. This option has been superseded by
'-mexplicit-relocs' but is retained for backwards compatibility.
'-mexplicit-relocs'
'-mno-explicit-relocs'
Use (do not use) assembler relocation operators when dealing with
symbolic addresses. The alternative, selected by
'-mno-explicit-relocs', is to use assembler macros instead.
'-mexplicit-relocs' is the default if GCC was configured to use an
assembler that supports relocation operators.
'-mcheck-zero-division'
'-mno-check-zero-division'
Trap (do not trap) on integer division by zero.
The default is '-mcheck-zero-division'.
'-mdivide-traps'
'-mdivide-breaks'
MIPS systems check for division by zero by generating either a
conditional trap or a break instruction. Using traps results in
smaller code, but is only supported on MIPS II and later. Also,
some versions of the Linux kernel have a bug that prevents trap
from generating the proper signal ('SIGFPE'). Use '-mdivide-traps'
to allow conditional traps on architectures that support them and
'-mdivide-breaks' to force the use of breaks.
The default is usually '-mdivide-traps', but this can be overridden
at configure time using '--with-divide=breaks'. Divide-by-zero
checks can be completely disabled using '-mno-check-zero-division'.
'-mmemcpy'
'-mno-memcpy'
Force (do not force) the use of 'memcpy()' for non-trivial block
moves. The default is '-mno-memcpy', which allows GCC to inline
most constant-sized copies.
'-mlong-calls'
'-mno-long-calls'
Disable (do not disable) use of the 'jal' instruction. Calling
functions using 'jal' is more efficient but requires the caller and
callee to be in the same 256 megabyte segment.
This option has no effect on abicalls code. The default is
'-mno-long-calls'.
'-mmad'
'-mno-mad'
Enable (disable) use of the 'mad', 'madu' and 'mul' instructions,
as provided by the R4650 ISA.
'-mfused-madd'
'-mno-fused-madd'
Enable (disable) use of the floating point multiply-accumulate
instructions, when they are available. The default is
'-mfused-madd'.
When multiply-accumulate instructions are used, the intermediate
product is calculated to infinite precision and is not subject to
the FCSR Flush to Zero bit. This may be undesirable in some
circumstances.
'-nocpp'
Tell the MIPS assembler to not run its preprocessor over user
assembler files (with a '.s' suffix) when assembling them.
'-mfix-r4000'
'-mno-fix-r4000'
Work around certain R4000 CPU errata:
- A double-word or a variable shift may give an incorrect result
if executed immediately after starting an integer division.
- A double-word or a variable shift may give an incorrect result
if executed while an integer multiplication is in progress.
- An integer division may give an incorrect result if started in
a delay slot of a taken branch or a jump.
'-mfix-r4400'
'-mno-fix-r4400'
Work around certain R4400 CPU errata:
- A double-word or a variable shift may give an incorrect result
if executed immediately after starting an integer division.
'-mfix-vr4120'
'-mno-fix-vr4120'
Work around certain VR4120 errata:
- 'dmultu' does not always produce the correct result.
- 'div' and 'ddiv' do not always produce the correct result if
one of the operands is negative.
The workarounds for the division errata rely on special functions
in 'libgcc.a'. At present, these functions are only provided by
the 'mips64vr*-elf' configurations.
Other VR4120 errata require a nop to be inserted between certain
pairs of instructions. These errata are handled by the assembler,
not by GCC itself.
'-mfix-vr4130'
Work around the VR4130 'mflo'/'mfhi' errata. The workarounds are
implemented by the assembler rather than by GCC, although GCC will
avoid using 'mflo' and 'mfhi' if the VR4130 'macc', 'macchi',
'dmacc' and 'dmacchi' instructions are available instead.
'-mfix-sb1'
'-mno-fix-sb1'
Work around certain SB-1 CPU core errata. (This flag currently
works around the SB-1 revision 2 "F1" and "F2" floating point
errata.)
'-mflush-func=FUNC'
'-mno-flush-func'
Specifies the function to call to flush the I and D caches, or to
not call any such function. If called, the function must take the
same arguments as the common '_flush_func()', that is, the address
of the memory range for which the cache is being flushed, the size
of the memory range, and the number 3 (to flush both caches). The
default depends on the target GCC was configured for, but commonly
is either '_flush_func' or '__cpu_flush'.
'mbranch-cost=NUM'
Set the cost of branches to roughly NUM "simple" instructions.
This cost is only a heuristic and is not guaranteed to produce
consistent results across releases. A zero cost redundantly
selects the default, which is based on the '-mtune' setting.
'-mbranch-likely'
'-mno-branch-likely'
Enable or disable use of Branch Likely instructions, regardless of
the default for the selected architecture. By default, Branch
Likely instructions may be generated if they are supported by the
selected architecture. An exception is for the MIPS32 and MIPS64
architectures and processors which implement those architectures;
for those, Branch Likely instructions will not be generated by
default because the MIPS32 and MIPS64 architectures specifically
deprecate their use.
'-mfp-exceptions'
'-mno-fp-exceptions'
Specifies whether FP exceptions are enabled. This affects how we
schedule FP instructions for some processors. The default is that
FP exceptions are enabled.
For instance, on the SB-1, if FP exceptions are disabled, and we
are emitting 64-bit code, then we can use both FP pipes.
Otherwise, we can only use one FP pipe.
'-mvr4130-align'
'-mno-vr4130-align'
The VR4130 pipeline is two-way superscalar, but can only issue two
instructions together if the first one is 8-byte aligned. When
this option is enabled, GCC will align pairs of instructions that
it thinks should execute in parallel.
This option only has an effect when optimizing for the VR4130. It
normally makes code faster, but at the expense of making it bigger.
It is enabled by default at optimization level '-O3'.

File: gcc.info, Node: MMIX Options, Next: MN10300 Options, Prev: MIPS Options, Up: Submodel Options
3.17.22 MMIX Options
--------------------
These options are defined for the MMIX:
'-mlibfuncs'
'-mno-libfuncs'
Specify that intrinsic library functions are being compiled,
passing all values in registers, no matter the size.
'-mepsilon'
'-mno-epsilon'
Generate floating-point comparison instructions that compare with
respect to the 'rE' epsilon register.
'-mabi=mmixware'
'-mabi=gnu'
Generate code that passes function parameters and return values
that (in the called function) are seen as registers '$0' and up, as
opposed to the GNU ABI which uses global registers '$231' and up.
'-mzero-extend'
'-mno-zero-extend'
When reading data from memory in sizes shorter than 64 bits, use
(do not use) zero-extending load instructions by default, rather
than sign-extending ones.
'-mknuthdiv'
'-mno-knuthdiv'
Make the result of a division yielding a remainder have the same
sign as the divisor. With the default, '-mno-knuthdiv', the sign
of the remainder follows the sign of the dividend. Both methods
are arithmetically valid, the latter being almost exclusively used.
'-mtoplevel-symbols'
'-mno-toplevel-symbols'
Prepend (do not prepend) a ':' to all global symbols, so the
assembly code can be used with the 'PREFIX' assembly directive.
'-melf'
Generate an executable in the ELF format, rather than the default
'mmo' format used by the 'mmix' simulator.
'-mbranch-predict'
'-mno-branch-predict'
Use (do not use) the probable-branch instructions, when static
branch prediction indicates a probable branch.
'-mbase-addresses'
'-mno-base-addresses'
Generate (do not generate) code that uses _base addresses_. Using
a base address automatically generates a request (handled by the
assembler and the linker) for a constant to be set up in a global
register. The register is used for one or more base address
requests within the range 0 to 255 from the value held in the
register. The generally leads to short and fast code, but the
number of different data items that can be addressed is limited.
This means that a program that uses lots of static data may require
'-mno-base-addresses'.
'-msingle-exit'
'-mno-single-exit'
Force (do not force) generated code to have a single exit point in
each function.

File: gcc.info, Node: MN10300 Options, Next: MT Options, Prev: MMIX Options, Up: Submodel Options
3.17.23 MN10300 Options
-----------------------
These '-m' options are defined for Matsushita MN10300 architectures:
'-mmult-bug'
Generate code to avoid bugs in the multiply instructions for the
MN10300 processors. This is the default.
'-mno-mult-bug'
Do not generate code to avoid bugs in the multiply instructions for
the MN10300 processors.
'-mam33'
Generate code which uses features specific to the AM33 processor.
'-mno-am33'
Do not generate code which uses features specific to the AM33
processor. This is the default.
'-mreturn-pointer-on-d0'
When generating a function which returns a pointer, return the
pointer in both 'a0' and 'd0'. Otherwise, the pointer is returned
only in a0, and attempts to call such functions without a prototype
would result in errors. Note that this option is on by default;
use '-mno-return-pointer-on-d0' to disable it.
'-mno-crt0'
Do not link in the C run-time initialization object file.
'-mrelax'
Indicate to the linker that it should perform a relaxation
optimization pass to shorten branches, calls and absolute memory
addresses. This option only has an effect when used on the command
line for the final link step.
This option makes symbolic debugging impossible.

File: gcc.info, Node: MT Options, Next: PDP-11 Options, Prev: MN10300 Options, Up: Submodel Options
3.17.24 MT Options
------------------
These '-m' options are defined for Morpho MT architectures:
'-march=CPU-TYPE'
Generate code that will run on CPU-TYPE, which is the name of a
system representing a certain processor type. Possible values for
CPU-TYPE are 'ms1-64-001', 'ms1-16-002', 'ms1-16-003' and 'ms2'.
When this option is not used, the default is '-march=ms1-16-002'.
'-mbacc'
Use byte loads and stores when generating code.
'-mno-bacc'
Do not use byte loads and stores when generating code.
'-msim'
Use simulator runtime
'-mno-crt0'
Do not link in the C run-time initialization object file 'crti.o'.
Other run-time initialization and termination files such as
'startup.o' and 'exit.o' are still included on the linker command
line.

File: gcc.info, Node: PDP-11 Options, Next: PowerPC Options, Prev: MT Options, Up: Submodel Options
3.17.25 PDP-11 Options
----------------------
These options are defined for the PDP-11:
'-mfpu'
Use hardware FPP floating point. This is the default. (FIS
floating point on the PDP-11/40 is not supported.)
'-msoft-float'
Do not use hardware floating point.
'-mac0'
Return floating-point results in ac0 (fr0 in Unix assembler
syntax).
'-mno-ac0'
Return floating-point results in memory. This is the default.
'-m40'
Generate code for a PDP-11/40.
'-m45'
Generate code for a PDP-11/45. This is the default.
'-m10'
Generate code for a PDP-11/10.
'-mbcopy-builtin'
Use inline 'movmemhi' patterns for copying memory. This is the
default.
'-mbcopy'
Do not use inline 'movmemhi' patterns for copying memory.
'-mint16'
'-mno-int32'
Use 16-bit 'int'. This is the default.
'-mint32'
'-mno-int16'
Use 32-bit 'int'.
'-mfloat64'
'-mno-float32'
Use 64-bit 'float'. This is the default.
'-mfloat32'
'-mno-float64'
Use 32-bit 'float'.
'-mabshi'
Use 'abshi2' pattern. This is the default.
'-mno-abshi'
Do not use 'abshi2' pattern.
'-mbranch-expensive'
Pretend that branches are expensive. This is for experimenting
with code generation only.
'-mbranch-cheap'
Do not pretend that branches are expensive. This is the default.
'-msplit'
Generate code for a system with split I&D.
'-mno-split'
Generate code for a system without split I&D. This is the default.
'-munix-asm'
Use Unix assembler syntax. This is the default when configured for
'pdp11-*-bsd'.
'-mdec-asm'
Use DEC assembler syntax. This is the default when configured for
any PDP-11 target other than 'pdp11-*-bsd'.

File: gcc.info, Node: PowerPC Options, Next: RS/6000 and PowerPC Options, Prev: PDP-11 Options, Up: Submodel Options
3.17.26 PowerPC Options
-----------------------
These are listed under *Note RS/6000 and PowerPC Options::.

File: gcc.info, Node: RS/6000 and PowerPC Options, Next: S/390 and zSeries Options, Prev: PowerPC Options, Up: Submodel Options
3.17.27 IBM RS/6000 and PowerPC Options
---------------------------------------
These '-m' options are defined for the IBM RS/6000 and PowerPC:
'-mpower'
'-mno-power'
'-mpower2'
'-mno-power2'
'-mpowerpc'
'-mno-powerpc'
'-mpowerpc-gpopt'
'-mno-powerpc-gpopt'
'-mpowerpc-gfxopt'
'-mno-powerpc-gfxopt'
'-mpowerpc64'
'-mno-powerpc64'
'-mmfcrf'
'-mno-mfcrf'
'-mpopcntb'
'-mno-popcntb'
'-mfprnd'
'-mno-fprnd'
'-mcmpb'
'-mno-cmpb'
'-mmfpgpr'
'-mno-mfpgpr'
'-mhard-dfp'
'-mno-hard-dfp'
GCC supports two related instruction set architectures for the
RS/6000 and PowerPC. The "POWER" instruction set are those
instructions supported by the 'rios' chip set used in the original
RS/6000 systems and the "PowerPC" instruction set is the
architecture of the Freescale MPC5xx, MPC6xx, MPC8xx
microprocessors, and the IBM 4xx, 6xx, and follow-on
microprocessors.
Neither architecture is a subset of the other. However there is a
large common subset of instructions supported by both. An MQ
register is included in processors supporting the POWER
architecture.
You use these options to specify which instructions are available
on the processor you are using. The default value of these options
is determined when configuring GCC. Specifying the
'-mcpu=CPU_TYPE' overrides the specification of these options. We
recommend you use the '-mcpu=CPU_TYPE' option rather than the
options listed above.
The '-mpower' option allows GCC to generate instructions that are
found only in the POWER architecture and to use the MQ register.
Specifying '-mpower2' implies '-power' and also allows GCC to
generate instructions that are present in the POWER2 architecture
but not the original POWER architecture.
The '-mpowerpc' option allows GCC to generate instructions that are
found only in the 32-bit subset of the PowerPC architecture.
Specifying '-mpowerpc-gpopt' implies '-mpowerpc' and also allows
GCC to use the optional PowerPC architecture instructions in the
General Purpose group, including floating-point square root.
Specifying '-mpowerpc-gfxopt' implies '-mpowerpc' and also allows
GCC to use the optional PowerPC architecture instructions in the
Graphics group, including floating-point select.
The '-mmfcrf' option allows GCC to generate the move from condition
register field instruction implemented on the POWER4 processor and
other processors that support the PowerPC V2.01 architecture. The
'-mpopcntb' option allows GCC to generate the popcount and double
precision FP reciprocal estimate instruction implemented on the
POWER5 processor and other processors that support the PowerPC
V2.02 architecture. The '-mfprnd' option allows GCC to generate
the FP round to integer instructions implemented on the POWER5+
processor and other processors that support the PowerPC V2.03
architecture. The '-mcmpb' option allows GCC to generate the
compare bytes instruction implemented on the POWER6 processor and
other processors that support the PowerPC V2.05 architecture. The
'-mmfpgpr' option allows GCC to generate the FP move to/from
general purpose register instructions implemented on the POWER6X
processor and other processors that support the extended PowerPC
V2.05 architecture. The '-mhard-dfp' option allows GCC to generate
the decimal floating point instructions implemented on some POWER
processors.
The '-mpowerpc64' option allows GCC to generate the additional
64-bit instructions that are found in the full PowerPC64
architecture and to treat GPRs as 64-bit, doubleword quantities.
GCC defaults to '-mno-powerpc64'.
If you specify both '-mno-power' and '-mno-powerpc', GCC will use
only the instructions in the common subset of both architectures
plus some special AIX common-mode calls, and will not use the MQ
register. Specifying both '-mpower' and '-mpowerpc' permits GCC to
use any instruction from either architecture and to allow use of
the MQ register; specify this for the Motorola MPC601.
'-mnew-mnemonics'
'-mold-mnemonics'
Select which mnemonics to use in the generated assembler code.
With '-mnew-mnemonics', GCC uses the assembler mnemonics defined
for the PowerPC architecture. With '-mold-mnemonics' it uses the
assembler mnemonics defined for the POWER architecture.
Instructions defined in only one architecture have only one
mnemonic; GCC uses that mnemonic irrespective of which of these
options is specified.
GCC defaults to the mnemonics appropriate for the architecture in
use. Specifying '-mcpu=CPU_TYPE' sometimes overrides the value of
these option. Unless you are building a cross-compiler, you should
normally not specify either '-mnew-mnemonics' or '-mold-mnemonics',
but should instead accept the default.
'-mcpu=CPU_TYPE'
Set architecture type, register usage, choice of mnemonics, and
instruction scheduling parameters for machine type CPU_TYPE.
Supported values for CPU_TYPE are '401', '403', '405', '405fp',
'440', '440fp', '505', '601', '602', '603', '603e', '604', '604e',
'620', '630', '740', '7400', '7450', '750', '801', '821', '823',
'860', '970', '8540', 'ec603e', 'G3', 'G4', 'G5', 'power',
'power2', 'power3', 'power4', 'power5', 'power5+', 'power6',
'power6x', 'common', 'powerpc', 'powerpc64', 'rios', 'rios1',
'rios2', 'rsc', and 'rs64'.
'-mcpu=common' selects a completely generic processor. Code
generated under this option will run on any POWER or PowerPC
processor. GCC will use only the instructions in the common subset
of both architectures, and will not use the MQ register. GCC
assumes a generic processor model for scheduling purposes.
'-mcpu=power', '-mcpu=power2', '-mcpu=powerpc', and
'-mcpu=powerpc64' specify generic POWER, POWER2, pure 32-bit
PowerPC (i.e., not MPC601), and 64-bit PowerPC architecture machine
types, with an appropriate, generic processor model assumed for
scheduling purposes.
The other options specify a specific processor. Code generated
under those options will run best on that processor, and may not
run at all on others.
The '-mcpu' options automatically enable or disable the following
options:
-maltivec -mfprnd -mhard-float -mmfcrf -mmultiple
-mnew-mnemonics -mpopcntb -mpower -mpower2 -mpowerpc64
-mpowerpc-gpopt -mpowerpc-gfxopt -mstring -mmulhw -mdlmzb -mmfpgpr
The particular options set for any particular CPU will vary between
compiler versions, depending on what setting seems to produce
optimal code for that CPU; it doesn't necessarily reflect the
actual hardware's capabilities. If you wish to set an individual
option to a particular value, you may specify it after the '-mcpu'
option, like '-mcpu=970 -mno-altivec'.
On AIX, the '-maltivec' and '-mpowerpc64' options are not enabled
or disabled by the '-mcpu' option at present because AIX does not
have full support for these options. You may still enable or
disable them individually if you're sure it'll work in your
environment.
'-mtune=CPU_TYPE'
Set the instruction scheduling parameters for machine type
CPU_TYPE, but do not set the architecture type, register usage, or
choice of mnemonics, as '-mcpu=CPU_TYPE' would. The same values
for CPU_TYPE are used for '-mtune' as for '-mcpu'. If both are
specified, the code generated will use the architecture, registers,
and mnemonics set by '-mcpu', but the scheduling parameters set by
'-mtune'.
'-mswdiv'
'-mno-swdiv'
Generate code to compute division as reciprocal estimate and
iterative refinement, creating opportunities for increased
throughput. This feature requires: optional PowerPC Graphics
instruction set for single precision and FRE instruction for double
precision, assuming divides cannot generate user-visible traps, and
the domain values not include Infinities, denormals or zero
denominator.
'-maltivec'
'-mno-altivec'
Generate code that uses (does not use) AltiVec instructions, and
also enable the use of built-in functions that allow more direct
access to the AltiVec instruction set. You may also need to set
'-mabi=altivec' to adjust the current ABI with AltiVec ABI
enhancements.
'-mvrsave'
'-mno-vrsave'
Generate VRSAVE instructions when generating AltiVec code.
'-msecure-plt'
Generate code that allows ld and ld.so to build executables and
shared libraries with non-exec .plt and .got sections. This is a
PowerPC 32-bit SYSV ABI option.
'-mbss-plt'
Generate code that uses a BSS .plt section that ld.so fills in, and
requires .plt and .got sections that are both writable and
executable. This is a PowerPC 32-bit SYSV ABI option.
'-misel'
'-mno-isel'
This switch enables or disables the generation of ISEL
instructions.
'-misel=YES/NO'
This switch has been deprecated. Use '-misel' and '-mno-isel'
instead.
'-mspe'
'-mno-spe'
This switch enables or disables the generation of SPE simd
instructions.
'-mpaired'
'-mno-paired'
This switch enables or disables the generation of PAIRED simd
instructions.
'-mspe=YES/NO'
This option has been deprecated. Use '-mspe' and '-mno-spe'
instead.
'-mfloat-gprs=YES/SINGLE/DOUBLE/NO'
'-mfloat-gprs'
This switch enables or disables the generation of floating point
operations on the general purpose registers for architectures that
support it.
The argument YES or SINGLE enables the use of single-precision
floating point operations.
The argument DOUBLE enables the use of single and double-precision
floating point operations.
The argument NO disables floating point operations on the general
purpose registers.
This option is currently only available on the MPC854x.
'-m32'
'-m64'
Generate code for 32-bit or 64-bit environments of Darwin and SVR4
targets (including GNU/Linux). The 32-bit environment sets int,
long and pointer to 32 bits and generates code that runs on any
PowerPC variant. The 64-bit environment sets int to 32 bits and
long and pointer to 64 bits, and generates code for PowerPC64, as
for '-mpowerpc64'.
'-mfull-toc'
'-mno-fp-in-toc'
'-mno-sum-in-toc'
'-mminimal-toc'
Modify generation of the TOC (Table Of Contents), which is created
for every executable file. The '-mfull-toc' option is selected by
default. In that case, GCC will allocate at least one TOC entry
for each unique non-automatic variable reference in your program.
GCC will also place floating-point constants in the TOC. However,
only 16,384 entries are available in the TOC.
If you receive a linker error message that saying you have
overflowed the available TOC space, you can reduce the amount of
TOC space used with the '-mno-fp-in-toc' and '-mno-sum-in-toc'
options. '-mno-fp-in-toc' prevents GCC from putting floating-point
constants in the TOC and '-mno-sum-in-toc' forces GCC to generate
code to calculate the sum of an address and a constant at run-time
instead of putting that sum into the TOC. You may specify one or
both of these options. Each causes GCC to produce very slightly
slower and larger code at the expense of conserving TOC space.
If you still run out of space in the TOC even when you specify both
of these options, specify '-mminimal-toc' instead. This option
causes GCC to make only one TOC entry for every file. When you
specify this option, GCC will produce code that is slower and
larger but which uses extremely little TOC space. You may wish to
use this option only on files that contain less frequently executed
code.
'-maix64'
'-maix32'
Enable 64-bit AIX ABI and calling convention: 64-bit pointers,
64-bit 'long' type, and the infrastructure needed to support them.
Specifying '-maix64' implies '-mpowerpc64' and '-mpowerpc', while
'-maix32' disables the 64-bit ABI and implies '-mno-powerpc64'.
GCC defaults to '-maix32'.
'-mxl-compat'
'-mno-xl-compat'
Produce code that conforms more closely to IBM XL compiler
semantics when using AIX-compatible ABI. Pass floating-point
arguments to prototyped functions beyond the register save area
(RSA) on the stack in addition to argument FPRs. Do not assume
that most significant double in 128-bit long double value is
properly rounded when comparing values and converting to double.
Use XL symbol names for long double support routines.
The AIX calling convention was extended but not initially
documented to handle an obscure K&R C case of calling a function
that takes the address of its arguments with fewer arguments than
declared. IBM XL compilers access floating point arguments which
do not fit in the RSA from the stack when a subroutine is compiled
without optimization. Because always storing floating-point
arguments on the stack is inefficient and rarely needed, this
option is not enabled by default and only is necessary when calling
subroutines compiled by IBM XL compilers without optimization.
'-mpe'
Support "IBM RS/6000 SP" "Parallel Environment" (PE). Link an
application written to use message passing with special startup
code to enable the application to run. The system must have PE
installed in the standard location ('/usr/lpp/ppe.poe/'), or the
'specs' file must be overridden with the '-specs=' option to
specify the appropriate directory location. The Parallel
Environment does not support threads, so the '-mpe' option and the
'-pthread' option are incompatible.
'-malign-natural'
'-malign-power'
On AIX, 32-bit Darwin, and 64-bit PowerPC GNU/Linux, the option
'-malign-natural' overrides the ABI-defined alignment of larger
types, such as floating-point doubles, on their natural size-based
boundary. The option '-malign-power' instructs GCC to follow the
ABI-specified alignment rules. GCC defaults to the standard
alignment defined in the ABI.
On 64-bit Darwin, natural alignment is the default, and
'-malign-power' is not supported.
'-msoft-float'
'-mhard-float'
Generate code that does not use (uses) the floating-point register
set. Software floating point emulation is provided if you use the
'-msoft-float' option, and pass the option to GCC when linking.
'-mmultiple'
'-mno-multiple'
Generate code that uses (does not use) the load multiple word
instructions and the store multiple word instructions. These
instructions are generated by default on POWER systems, and not
generated on PowerPC systems. Do not use '-mmultiple' on little
endian PowerPC systems, since those instructions do not work when
the processor is in little endian mode. The exceptions are PPC740
and PPC750 which permit the instructions usage in little endian
mode.
'-mstring'
'-mno-string'
Generate code that uses (does not use) the load string instructions
and the store string word instructions to save multiple registers
and do small block moves. These instructions are generated by
default on POWER systems, and not generated on PowerPC systems. Do
not use '-mstring' on little endian PowerPC systems, since those
instructions do not work when the processor is in little endian
mode. The exceptions are PPC740 and PPC750 which permit the
instructions usage in little endian mode.
'-mupdate'
'-mno-update'
Generate code that uses (does not use) the load or store
instructions that update the base register to the address of the
calculated memory location. These instructions are generated by
default. If you use '-mno-update', there is a small window between
the time that the stack pointer is updated and the address of the
previous frame is stored, which means code that walks the stack
frame across interrupts or signals may get corrupted data.
'-mfused-madd'
'-mno-fused-madd'
Generate code that uses (does not use) the floating point multiply
and accumulate instructions. These instructions are generated by
default if hardware floating is used.
'-mmulhw'
'-mno-mulhw'
Generate code that uses (does not use) the half-word multiply and
multiply-accumulate instructions on the IBM 405 and 440 processors.
These instructions are generated by default when targetting those
processors.
'-mdlmzb'
'-mno-dlmzb'
Generate code that uses (does not use) the string-search 'dlmzb'
instruction on the IBM 405 and 440 processors. This instruction is
generated by default when targetting those processors.
'-mno-bit-align'
'-mbit-align'
On System V.4 and embedded PowerPC systems do not (do) force
structures and unions that contain bit-fields to be aligned to the
base type of the bit-field.
For example, by default a structure containing nothing but 8
'unsigned' bit-fields of length 1 would be aligned to a 4 byte
boundary and have a size of 4 bytes. By using '-mno-bit-align',
the structure would be aligned to a 1 byte boundary and be one byte
in size.
'-mno-strict-align'
'-mstrict-align'
On System V.4 and embedded PowerPC systems do not (do) assume that
unaligned memory references will be handled by the system.
'-mrelocatable'
'-mno-relocatable'
On embedded PowerPC systems generate code that allows (does not
allow) the program to be relocated to a different address at
runtime. If you use '-mrelocatable' on any module, all objects
linked together must be compiled with '-mrelocatable' or
'-mrelocatable-lib'.
'-mrelocatable-lib'
'-mno-relocatable-lib'
On embedded PowerPC systems generate code that allows (does not
allow) the program to be relocated to a different address at
runtime. Modules compiled with '-mrelocatable-lib' can be linked
with either modules compiled without '-mrelocatable' and
'-mrelocatable-lib' or with modules compiled with the
'-mrelocatable' options.
'-mno-toc'
'-mtoc'
On System V.4 and embedded PowerPC systems do not (do) assume that
register 2 contains a pointer to a global area pointing to the
addresses used in the program.
'-mlittle'
'-mlittle-endian'
On System V.4 and embedded PowerPC systems compile code for the
processor in little endian mode. The '-mlittle-endian' option is
the same as '-mlittle'.
'-mbig'
'-mbig-endian'
On System V.4 and embedded PowerPC systems compile code for the
processor in big endian mode. The '-mbig-endian' option is the
same as '-mbig'.
'-mdynamic-no-pic'
On Darwin and Mac OS X systems, compile code so that it is not
relocatable, but that its external references are relocatable. The
resulting code is suitable for applications, but not shared
libraries.
'-mprioritize-restricted-insns=PRIORITY'
This option controls the priority that is assigned to dispatch-slot
restricted instructions during the second scheduling pass. The
argument PRIORITY takes the value 0/1/2 to assign
NO/HIGHEST/SECOND-HIGHEST priority to dispatch slot restricted
instructions.
'-msched-costly-dep=DEPENDENCE_TYPE'
This option controls which dependences are considered costly by the
target during instruction scheduling. The argument DEPENDENCE_TYPE
takes one of the following values: NO: no dependence is costly,
ALL: all dependences are costly, TRUE_STORE_TO_LOAD: a true
dependence from store to load is costly, STORE_TO_LOAD: any
dependence from store to load is costly, NUMBER: any dependence
which latency >= NUMBER is costly.
'-minsert-sched-nops=SCHEME'
This option controls which nop insertion scheme will be used during
the second scheduling pass. The argument SCHEME takes one of the
following values: NO: Don't insert nops. PAD: Pad with nops any
dispatch group which has vacant issue slots, according to the
scheduler's grouping. REGROUP_EXACT: Insert nops to force costly
dependent insns into separate groups. Insert exactly as many nops
as needed to force an insn to a new group, according to the
estimated processor grouping. NUMBER: Insert nops to force costly
dependent insns into separate groups. Insert NUMBER nops to force
an insn to a new group.
'-mcall-sysv'
On System V.4 and embedded PowerPC systems compile code using
calling conventions that adheres to the March 1995 draft of the
System V Application Binary Interface, PowerPC processor
supplement. This is the default unless you configured GCC using
'powerpc-*-eabiaix'.
'-mcall-sysv-eabi'
Specify both '-mcall-sysv' and '-meabi' options.
'-mcall-sysv-noeabi'
Specify both '-mcall-sysv' and '-mno-eabi' options.
'-mcall-solaris'
On System V.4 and embedded PowerPC systems compile code for the
Solaris operating system.
'-mcall-linux'
On System V.4 and embedded PowerPC systems compile code for the
Linux-based GNU system.
'-mcall-gnu'
On System V.4 and embedded PowerPC systems compile code for the
Hurd-based GNU system.
'-mcall-netbsd'
On System V.4 and embedded PowerPC systems compile code for the
NetBSD operating system.
'-maix-struct-return'
Return all structures in memory (as specified by the AIX ABI).
'-msvr4-struct-return'
Return structures smaller than 8 bytes in registers (as specified
by the SVR4 ABI).
'-mabi=ABI-TYPE'
Extend the current ABI with a particular extension, or remove such
extension. Valid values are ALTIVEC, NO-ALTIVEC, SPE, NO-SPE,
IBMLONGDOUBLE, IEEELONGDOUBLE.
'-mabi=spe'
Extend the current ABI with SPE ABI extensions. This does not
change the default ABI, instead it adds the SPE ABI extensions to
the current ABI.
'-mabi=no-spe'
Disable Booke SPE ABI extensions for the current ABI.
'-mabi=ibmlongdouble'
Change the current ABI to use IBM extended precision long double.
This is a PowerPC 32-bit SYSV ABI option.
'-mabi=ieeelongdouble'
Change the current ABI to use IEEE extended precision long double.
This is a PowerPC 32-bit Linux ABI option.
'-mprototype'
'-mno-prototype'
On System V.4 and embedded PowerPC systems assume that all calls to
variable argument functions are properly prototyped. Otherwise,
the compiler must insert an instruction before every non prototyped
call to set or clear bit 6 of the condition code register (CR) to
indicate whether floating point values were passed in the floating
point registers in case the function takes a variable arguments.
With '-mprototype', only calls to prototyped variable argument
functions will set or clear the bit.
'-msim'
On embedded PowerPC systems, assume that the startup module is
called 'sim-crt0.o' and that the standard C libraries are
'libsim.a' and 'libc.a'. This is the default for
'powerpc-*-eabisim' configurations.
'-mmvme'
On embedded PowerPC systems, assume that the startup module is
called 'crt0.o' and the standard C libraries are 'libmvme.a' and
'libc.a'.
'-mads'
On embedded PowerPC systems, assume that the startup module is
called 'crt0.o' and the standard C libraries are 'libads.a' and
'libc.a'.
'-myellowknife'
On embedded PowerPC systems, assume that the startup module is
called 'crt0.o' and the standard C libraries are 'libyk.a' and
'libc.a'.
'-mvxworks'
On System V.4 and embedded PowerPC systems, specify that you are
compiling for a VxWorks system.
'-mwindiss'
Specify that you are compiling for the WindISS simulation
environment.
'-memb'
On embedded PowerPC systems, set the PPC_EMB bit in the ELF flags
header to indicate that 'eabi' extended relocations are used.
'-meabi'
'-mno-eabi'
On System V.4 and embedded PowerPC systems do (do not) adhere to
the Embedded Applications Binary Interface (eabi) which is a set of
modifications to the System V.4 specifications. Selecting '-meabi'
means that the stack is aligned to an 8 byte boundary, a function
'__eabi' is called to from 'main' to set up the eabi environment,
and the '-msdata' option can use both 'r2' and 'r13' to point to
two separate small data areas. Selecting '-mno-eabi' means that
the stack is aligned to a 16 byte boundary, do not call an
initialization function from 'main', and the '-msdata' option will
only use 'r13' to point to a single small data area. The '-meabi'
option is on by default if you configured GCC using one of the
'powerpc*-*-eabi*' options.
'-msdata=eabi'
On System V.4 and embedded PowerPC systems, put small initialized
'const' global and static data in the '.sdata2' section, which is
pointed to by register 'r2'. Put small initialized non-'const'
global and static data in the '.sdata' section, which is pointed to
by register 'r13'. Put small uninitialized global and static data
in the '.sbss' section, which is adjacent to the '.sdata' section.
The '-msdata=eabi' option is incompatible with the '-mrelocatable'
option. The '-msdata=eabi' option also sets the '-memb' option.
'-msdata=sysv'
On System V.4 and embedded PowerPC systems, put small global and
static data in the '.sdata' section, which is pointed to by
register 'r13'. Put small uninitialized global and static data in
the '.sbss' section, which is adjacent to the '.sdata' section.
The '-msdata=sysv' option is incompatible with the '-mrelocatable'
option.
'-msdata=default'
'-msdata'
On System V.4 and embedded PowerPC systems, if '-meabi' is used,
compile code the same as '-msdata=eabi', otherwise compile code the
same as '-msdata=sysv'.
'-msdata-data'
On System V.4 and embedded PowerPC systems, put small global data
in the '.sdata' section. Put small uninitialized global data in
the '.sbss' section. Do not use register 'r13' to address small
data however. This is the default behavior unless other '-msdata'
options are used.
'-msdata=none'
'-mno-sdata'
On embedded PowerPC systems, put all initialized global and static
data in the '.data' section, and all uninitialized data in the
'.bss' section.
'-G NUM'
On embedded PowerPC systems, put global and static items less than
or equal to NUM bytes into the small data or bss sections instead
of the normal data or bss section. By default, NUM is 8. The '-G
NUM' switch is also passed to the linker. All modules should be
compiled with the same '-G NUM' value.
'-mregnames'
'-mno-regnames'
On System V.4 and embedded PowerPC systems do (do not) emit
register names in the assembly language output using symbolic
forms.
'-mlongcall'
'-mno-longcall'
By default assume that all calls are far away so that a longer more
expensive calling sequence is required. This is required for calls
further than 32 megabytes (33,554,432 bytes) from the current
location. A short call will be generated if the compiler knows the
call cannot be that far away. This setting can be overridden by
the 'shortcall' function attribute, or by '#pragma longcall(0)'.
Some linkers are capable of detecting out-of-range calls and
generating glue code on the fly. On these systems, long calls are
unnecessary and generate slower code. As of this writing, the AIX
linker can do this, as can the GNU linker for PowerPC/64. It is
planned to add this feature to the GNU linker for 32-bit PowerPC
systems as well.
On Darwin/PPC systems, '#pragma longcall' will generate "jbsr
callee, L42", plus a "branch island" (glue code). The two target
addresses represent the callee and the "branch island". The
Darwin/PPC linker will prefer the first address and generate a "bl
callee" if the PPC "bl" instruction will reach the callee directly;
otherwise, the linker will generate "bl L42" to call the "branch
island". The "branch island" is appended to the body of the
calling function; it computes the full 32-bit address of the callee
and jumps to it.
On Mach-O (Darwin) systems, this option directs the compiler emit
to the glue for every direct call, and the Darwin linker decides
whether to use or discard it.
In the future, we may cause GCC to ignore all longcall
specifications when the linker is known to generate glue.
'-pthread'
Adds support for multithreading with the "pthreads" library. This
option sets flags for both the preprocessor and linker.

File: gcc.info, Node: S/390 and zSeries Options, Next: Score Options, Prev: RS/6000 and PowerPC Options, Up: Submodel Options
3.17.28 S/390 and zSeries Options
---------------------------------
These are the '-m' options defined for the S/390 and zSeries
architecture.
'-mhard-float'
'-msoft-float'
Use (do not use) the hardware floating-point instructions and
registers for floating-point operations. When '-msoft-float' is
specified, functions in 'libgcc.a' will be used to perform
floating-point operations. When '-mhard-float' is specified, the
compiler generates IEEE floating-point instructions. This is the
default.
'-mhard-dfp'
'-mno-hard-dfp'
Use (do not use) the hardware decimal-floating-point instructions
for decimal-floating-point operations. When '-mno-hard-dfp' is
specified, functions in 'libgcc.a' will be used to perform
decimal-floating-point operations. When '-mhard-dfp' is specified,
the compiler generates decimal-floating-point hardware
instructions. This is the default for '-march=z9-ec' or higher.
'-mlong-double-64'
'-mlong-double-128'
These switches control the size of 'long double' type. A size of
64bit makes the 'long double' type equivalent to the 'double' type.
This is the default.
'-mbackchain'
'-mno-backchain'
Store (do not store) the address of the caller's frame as backchain
pointer into the callee's stack frame. A backchain may be needed
to allow debugging using tools that do not understand DWARF-2 call
frame information. When '-mno-packed-stack' is in effect, the
backchain pointer is stored at the bottom of the stack frame; when
'-mpacked-stack' is in effect, the backchain is placed into the
topmost word of the 96/160 byte register save area.
In general, code compiled with '-mbackchain' is call-compatible
with code compiled with '-mmo-backchain'; however, use of the
backchain for debugging purposes usually requires that the whole
binary is built with '-mbackchain'. Note that the combination of
'-mbackchain', '-mpacked-stack' and '-mhard-float' is not
supported. In order to build a linux kernel use '-msoft-float'.
The default is to not maintain the backchain.
'-mpacked-stack'
'-mno-packed-stack'
Use (do not use) the packed stack layout. When '-mno-packed-stack'
is specified, the compiler uses the all fields of the 96/160 byte
register save area only for their default purpose; unused fields
still take up stack space. When '-mpacked-stack' is specified,
register save slots are densely packed at the top of the register
save area; unused space is reused for other purposes, allowing for
more efficient use of the available stack space. However, when
'-mbackchain' is also in effect, the topmost word of the save area
is always used to store the backchain, and the return address
register is always saved two words below the backchain.
As long as the stack frame backchain is not used, code generated
with '-mpacked-stack' is call-compatible with code generated with
'-mno-packed-stack'. Note that some non-FSF releases of GCC 2.95
for S/390 or zSeries generated code that uses the stack frame
backchain at run time, not just for debugging purposes. Such code
is not call-compatible with code compiled with '-mpacked-stack'.
Also, note that the combination of '-mbackchain', '-mpacked-stack'
and '-mhard-float' is not supported. In order to build a linux
kernel use '-msoft-float'.
The default is to not use the packed stack layout.
'-msmall-exec'
'-mno-small-exec'
Generate (or do not generate) code using the 'bras' instruction to
do subroutine calls. This only works reliably if the total
executable size does not exceed 64k. The default is to use the
'basr' instruction instead, which does not have this limitation.
'-m64'
'-m31'
When '-m31' is specified, generate code compliant to the GNU/Linux
for S/390 ABI. When '-m64' is specified, generate code compliant
to the GNU/Linux for zSeries ABI. This allows GCC in particular to
generate 64-bit instructions. For the 's390' targets, the default
is '-m31', while the 's390x' targets default to '-m64'.
'-mzarch'
'-mesa'
When '-mzarch' is specified, generate code using the instructions
available on z/Architecture. When '-mesa' is specified, generate
code using the instructions available on ESA/390. Note that
'-mesa' is not possible with '-m64'. When generating code
compliant to the GNU/Linux for S/390 ABI, the default is '-mesa'.
When generating code compliant to the GNU/Linux for zSeries ABI,
the default is '-mzarch'.
'-mmvcle'
'-mno-mvcle'
Generate (or do not generate) code using the 'mvcle' instruction to
perform block moves. When '-mno-mvcle' is specified, use a 'mvc'
loop instead. This is the default unless optimizing for size.
'-mdebug'
'-mno-debug'
Print (or do not print) additional debug information when
compiling. The default is to not print debug information.
'-march=CPU-TYPE'
Generate code that will run on CPU-TYPE, which is the name of a
system representing a certain processor type. Possible values for
CPU-TYPE are 'g5', 'g6', 'z900', 'z990', 'z9-109' and 'z9-ec'.
When generating code using the instructions available on
z/Architecture, the default is '-march=z900'. Otherwise, the
default is '-march=g5'.
'-mtune=CPU-TYPE'
Tune to CPU-TYPE everything applicable about the generated code,
except for the ABI and the set of available instructions. The list
of CPU-TYPE values is the same as for '-march'. The default is the
value used for '-march'.
'-mtpf-trace'
'-mno-tpf-trace'
Generate code that adds (does not add) in TPF OS specific branches
to trace routines in the operating system. This option is off by
default, even when compiling for the TPF OS.
'-mfused-madd'
'-mno-fused-madd'
Generate code that uses (does not use) the floating point multiply
and accumulate instructions. These instructions are generated by
default if hardware floating point is used.
'-mwarn-framesize=FRAMESIZE'
Emit a warning if the current function exceeds the given frame
size. Because this is a compile time check it doesn't need to be a
real problem when the program runs. It is intended to identify
functions which most probably cause a stack overflow. It is useful
to be used in an environment with limited stack size e.g. the linux
kernel.
'-mwarn-dynamicstack'
Emit a warning if the function calls alloca or uses dynamically
sized arrays. This is generally a bad idea with a limited stack
size.
'-mstack-guard=STACK-GUARD'
'-mstack-size=STACK-SIZE'
If these options are provided the s390 back end emits additional
instructions in the function prologue which trigger a trap if the
stack size is STACK-GUARD bytes above the STACK-SIZE (remember that
the stack on s390 grows downward). If the STACK-GUARD option is
omitted the smallest power of 2 larger than the frame size of the
compiled function is chosen. These options are intended to be used
to help debugging stack overflow problems. The additionally
emitted code causes only little overhead and hence can also be used
in production like systems without greater performance degradation.
The given values have to be exact powers of 2 and STACK-SIZE has to
be greater than STACK-GUARD without exceeding 64k. In order to be
efficient the extra code makes the assumption that the stack starts
at an address aligned to the value given by STACK-SIZE. The
STACK-GUARD option can only be used in conjunction with STACK-SIZE.

File: gcc.info, Node: Score Options, Next: SH Options, Prev: S/390 and zSeries Options, Up: Submodel Options
3.17.29 Score Options
---------------------
These options are defined for Score implementations:
'-meb'
Compile code for big endian mode. This is the default.
'-mel'
Compile code for little endian mode.
'-mnhwloop'
Disable generate bcnz instruction.
'-muls'
Enable generate unaligned load and store instruction.
'-mmac'
Enable the use of multiply-accumulate instructions. Disabled by
default.
'-mscore5'
Specify the SCORE5 as the target architecture.
'-mscore5u'
Specify the SCORE5U of the target architecture.
'-mscore7'
Specify the SCORE7 as the target architecture. This is the
default.
'-mscore7d'
Specify the SCORE7D as the target architecture.

File: gcc.info, Node: SH Options, Next: SPARC Options, Prev: Score Options, Up: Submodel Options
3.17.30 SH Options
------------------
These '-m' options are defined for the SH implementations:
'-m1'
Generate code for the SH1.
'-m2'
Generate code for the SH2.
'-m2e'
Generate code for the SH2e.
'-m3'
Generate code for the SH3.
'-m3e'
Generate code for the SH3e.
'-m4-nofpu'
Generate code for the SH4 without a floating-point unit.
'-m4-single-only'
Generate code for the SH4 with a floating-point unit that only
supports single-precision arithmetic.
'-m4-single'
Generate code for the SH4 assuming the floating-point unit is in
single-precision mode by default.
'-m4'
Generate code for the SH4.
'-m4a-nofpu'
Generate code for the SH4al-dsp, or for a SH4a in such a way that
the floating-point unit is not used.
'-m4a-single-only'
Generate code for the SH4a, in such a way that no double-precision
floating point operations are used.
'-m4a-single'
Generate code for the SH4a assuming the floating-point unit is in
single-precision mode by default.
'-m4a'
Generate code for the SH4a.
'-m4al'
Same as '-m4a-nofpu', except that it implicitly passes '-dsp' to
the assembler. GCC doesn't generate any DSP instructions at the
moment.
'-mb'
Compile code for the processor in big endian mode.
'-ml'
Compile code for the processor in little endian mode.
'-mdalign'
Align doubles at 64-bit boundaries. Note that this changes the
calling conventions, and thus some functions from the standard C
library will not work unless you recompile it first with
'-mdalign'.
'-mrelax'
Shorten some address references at link time, when possible; uses
the linker option '-relax'.
'-mbigtable'
Use 32-bit offsets in 'switch' tables. The default is to use
16-bit offsets.
'-mfmovd'
Enable the use of the instruction 'fmovd'.
'-mhitachi'
Comply with the calling conventions defined by Renesas.
'-mrenesas'
Comply with the calling conventions defined by Renesas.
'-mno-renesas'
Comply with the calling conventions defined for GCC before the
Renesas conventions were available. This option is the default for
all targets of the SH toolchain except for 'sh-symbianelf'.
'-mnomacsave'
Mark the 'MAC' register as call-clobbered, even if '-mhitachi' is
given.
'-mieee'
Increase IEEE-compliance of floating-point code. At the moment,
this is equivalent to '-fno-finite-math-only'. When generating 16
bit SH opcodes, getting IEEE-conforming results for comparisons of
NANs / infinities incurs extra overhead in every floating point
comparison, therefore the default is set to '-ffinite-math-only'.
'-minline-ic_invalidate'
Inline code to invalidate instruction cache entries after setting
up nested function trampolines. This option has no effect if
-musermode is in effect and the selected code generation option
(e.g. -m4) does not allow the use of the icbi instruction. If the
selected code generation option does not allow the use of the icbi
instruction, and -musermode is not in effect, the inlined code will
manipulate the instruction cache address array directly with an
associative write. This not only requires privileged mode, but it
will also fail if the cache line had been mapped via the TLB and
has become unmapped.
'-misize'
Dump instruction size and location in the assembly code.
'-mpadstruct'
This option is deprecated. It pads structures to multiple of 4
bytes, which is incompatible with the SH ABI.
'-mspace'
Optimize for space instead of speed. Implied by '-Os'.
'-mprefergot'
When generating position-independent code, emit function calls
using the Global Offset Table instead of the Procedure Linkage
Table.
'-musermode'
Don't generate privileged mode only code; implies
-mno-inline-ic_invalidate if the inlined code would not work in
user mode. This is the default when the target is 'sh-*-linux*'.
'-multcost=NUMBER'
Set the cost to assume for a multiply insn.
'-mdiv=STRATEGY'
Set the division strategy to use for SHmedia code. STRATEGY must
be one of: call, call2, fp, inv, inv:minlat, inv20u, inv20l,
inv:call, inv:call2, inv:fp . "fp" performs the operation in
floating point. This has a very high latency, but needs only a few
instructions, so it might be a good choice if your code has enough
easily exploitable ILP to allow the compiler to schedule the
floating point instructions together with other instructions.
Division by zero causes a floating point exception. "inv" uses
integer operations to calculate the inverse of the divisor, and
then multiplies the dividend with the inverse. This strategy
allows cse and hoisting of the inverse calculation. Division by
zero calculates an unspecified result, but does not trap.
"inv:minlat" is a variant of "inv" where if no cse / hoisting
opportunities have been found, or if the entire operation has been
hoisted to the same place, the last stages of the inverse
calculation are intertwined with the final multiply to reduce the
overall latency, at the expense of using a few more instructions,
and thus offering fewer scheduling opportunities with other code.
"call" calls a library function that usually implements the
inv:minlat strategy. This gives high code density for
m5-*media-nofpu compilations. "call2" uses a different entry point
of the same library function, where it assumes that a pointer to a
lookup table has already been set up, which exposes the pointer
load to cse / code hoisting optimizations. "inv:call", "inv:call2"
and "inv:fp" all use the "inv" algorithm for initial code
generation, but if the code stays unoptimized, revert to the
"call", "call2", or "fp" strategies, respectively. Note that the
potentially-trapping side effect of division by zero is carried by
a separate instruction, so it is possible that all the integer
instructions are hoisted out, but the marker for the side effect
stays where it is. A recombination to fp operations or a call is
not possible in that case. "inv20u" and "inv20l" are variants of
the "inv:minlat" strategy. In the case that the inverse
calculation was nor separated from the multiply, they speed up
division where the dividend fits into 20 bits (plus sign where
applicable), by inserting a test to skip a number of operations in
this case; this test slows down the case of larger dividends.
inv20u assumes the case of a such a small dividend to be unlikely,
and inv20l assumes it to be likely.
'-mdivsi3_libfunc=NAME'
Set the name of the library function used for 32 bit signed
division to NAME. This only affect the name used in the call and
inv:call division strategies, and the compiler will still expect
the same sets of input/output/clobbered registers as if this option
was not present.
'-madjust-unroll'
Throttle unrolling to avoid thrashing target registers. This
option only has an effect if the gcc code base supports the
TARGET_ADJUST_UNROLL_MAX target hook.
'-mindexed-addressing'
Enable the use of the indexed addressing mode for
SHmedia32/SHcompact. This is only safe if the hardware and/or OS
implement 32 bit wrap-around semantics for the indexed addressing
mode. The architecture allows the implementation of processors
with 64 bit MMU, which the OS could use to get 32 bit addressing,
but since no current hardware implementation supports this or any
other way to make the indexed addressing mode safe to use in the 32
bit ABI, the default is -mno-indexed-addressing.
'-mgettrcost=NUMBER'
Set the cost assumed for the gettr instruction to NUMBER. The
default is 2 if '-mpt-fixed' is in effect, 100 otherwise.
'-mpt-fixed'
Assume pt* instructions won't trap. This will generally generate
better scheduled code, but is unsafe on current hardware. The
current architecture definition says that ptabs and ptrel trap when
the target anded with 3 is 3. This has the unintentional effect of
making it unsafe to schedule ptabs / ptrel before a branch, or
hoist it out of a loop. For example, __do_global_ctors, a part of
libgcc that runs constructors at program startup, calls functions
in a list which is delimited by -1. With the -mpt-fixed option,
the ptabs will be done before testing against -1. That means that
all the constructors will be run a bit quicker, but when the loop
comes to the end of the list, the program crashes because ptabs
loads -1 into a target register. Since this option is unsafe for
any hardware implementing the current architecture specification,
the default is -mno-pt-fixed. Unless the user specifies a specific
cost with '-mgettrcost', -mno-pt-fixed also implies
'-mgettrcost=100'; this deters register allocation using target
registers for storing ordinary integers.
'-minvalid-symbols'
Assume symbols might be invalid. Ordinary function symbols
generated by the compiler will always be valid to load with
movi/shori/ptabs or movi/shori/ptrel, but with assembler and/or
linker tricks it is possible to generate symbols that will cause
ptabs / ptrel to trap. This option is only meaningful when
'-mno-pt-fixed' is in effect. It will then prevent
cross-basic-block cse, hoisting and most scheduling of symbol
loads. The default is '-mno-invalid-symbols'.

File: gcc.info, Node: SPARC Options, Next: SPU Options, Prev: SH Options, Up: Submodel Options
3.17.31 SPARC Options
---------------------
These '-m' options are supported on the SPARC:
'-mno-app-regs'
'-mapp-regs'
Specify '-mapp-regs' to generate output using the global registers
2 through 4, which the SPARC SVR4 ABI reserves for applications.
This is the default.
To be fully SVR4 ABI compliant at the cost of some performance
loss, specify '-mno-app-regs'. You should compile libraries and
system software with this option.
'-mfpu'
'-mhard-float'
Generate output containing floating point instructions. This is
the default.
'-mno-fpu'
'-msoft-float'
Generate output containing library calls for floating point.
*Warning:* the requisite libraries are not available for all SPARC
targets. Normally the facilities of the machine's usual C compiler
are used, but this cannot be done directly in cross-compilation.
You must make your own arrangements to provide suitable library
functions for cross-compilation. The embedded targets
'sparc-*-aout' and 'sparclite-*-*' do provide software floating
point support.
'-msoft-float' changes the calling convention in the output file;
therefore, it is only useful if you compile _all_ of a program with
this option. In particular, you need to compile 'libgcc.a', the
library that comes with GCC, with '-msoft-float' in order for this
to work.
'-mhard-quad-float'
Generate output containing quad-word (long double) floating point
instructions.
'-msoft-quad-float'
Generate output containing library calls for quad-word (long
double) floating point instructions. The functions called are
those specified in the SPARC ABI. This is the default.
As of this writing, there are no SPARC implementations that have
hardware support for the quad-word floating point instructions.
They all invoke a trap handler for one of these instructions, and
then the trap handler emulates the effect of the instruction.
Because of the trap handler overhead, this is much slower than
calling the ABI library routines. Thus the '-msoft-quad-float'
option is the default.
'-mno-unaligned-doubles'
'-munaligned-doubles'
Assume that doubles have 8 byte alignment. This is the default.
With '-munaligned-doubles', GCC assumes that doubles have 8 byte
alignment only if they are contained in another type, or if they
have an absolute address. Otherwise, it assumes they have 4 byte
alignment. Specifying this option avoids some rare compatibility
problems with code generated by other compilers. It is not the
default because it results in a performance loss, especially for
floating point code.
'-mno-faster-structs'
'-mfaster-structs'
With '-mfaster-structs', the compiler assumes that structures
should have 8 byte alignment. This enables the use of pairs of
'ldd' and 'std' instructions for copies in structure assignment, in
place of twice as many 'ld' and 'st' pairs. However, the use of
this changed alignment directly violates the SPARC ABI. Thus, it's
intended only for use on targets where the developer acknowledges
that their resulting code will not be directly in line with the
rules of the ABI.
'-mimpure-text'
'-mimpure-text', used in addition to '-shared', tells the compiler
to not pass '-z text' to the linker when linking a shared object.
Using this option, you can link position-dependent code into a
shared object.
'-mimpure-text' suppresses the "relocations remain against
allocatable but non-writable sections" linker error message.
However, the necessary relocations will trigger copy-on-write, and
the shared object is not actually shared across processes. Instead
of using '-mimpure-text', you should compile all source code with
'-fpic' or '-fPIC'.
This option is only available on SunOS and Solaris.
'-mcpu=CPU_TYPE'
Set the instruction set, register set, and instruction scheduling
parameters for machine type CPU_TYPE. Supported values for
CPU_TYPE are 'v7', 'cypress', 'v8', 'supersparc', 'sparclite',
'f930', 'f934', 'hypersparc', 'sparclite86x', 'sparclet', 'tsc701',
'v9', 'ultrasparc', 'ultrasparc3', 'niagara' and 'niagara2'.
Default instruction scheduling parameters are used for values that
select an architecture and not an implementation. These are 'v7',
'v8', 'sparclite', 'sparclet', 'v9'.
Here is a list of each supported architecture and their supported
implementations.
v7: cypress
v8: supersparc, hypersparc
sparclite: f930, f934, sparclite86x
sparclet: tsc701
v9: ultrasparc, ultrasparc3, niagara, niagara2
By default (unless configured otherwise), GCC generates code for
the V7 variant of the SPARC architecture. With '-mcpu=cypress',
the compiler additionally optimizes it for the Cypress CY7C602
chip, as used in the SPARCStation/SPARCServer 3xx series. This is
also appropriate for the older SPARCStation 1, 2, IPX etc.
With '-mcpu=v8', GCC generates code for the V8 variant of the SPARC
architecture. The only difference from V7 code is that the
compiler emits the integer multiply and integer divide instructions
which exist in SPARC-V8 but not in SPARC-V7. With
'-mcpu=supersparc', the compiler additionally optimizes it for the
SuperSPARC chip, as used in the SPARCStation 10, 1000 and 2000
series.
With '-mcpu=sparclite', GCC generates code for the SPARClite
variant of the SPARC architecture. This adds the integer multiply,
integer divide step and scan ('ffs') instructions which exist in
SPARClite but not in SPARC-V7. With '-mcpu=f930', the compiler
additionally optimizes it for the Fujitsu MB86930 chip, which is
the original SPARClite, with no FPU. With '-mcpu=f934', the
compiler additionally optimizes it for the Fujitsu MB86934 chip,
which is the more recent SPARClite with FPU.
With '-mcpu=sparclet', GCC generates code for the SPARClet variant
of the SPARC architecture. This adds the integer multiply,
multiply/accumulate, integer divide step and scan ('ffs')
instructions which exist in SPARClet but not in SPARC-V7. With
'-mcpu=tsc701', the compiler additionally optimizes it for the
TEMIC SPARClet chip.
With '-mcpu=v9', GCC generates code for the V9 variant of the SPARC
architecture. This adds 64-bit integer and floating-point move
instructions, 3 additional floating-point condition code registers
and conditional move instructions. With '-mcpu=ultrasparc', the
compiler additionally optimizes it for the Sun UltraSPARC I/II/IIi
chips. With '-mcpu=ultrasparc3', the compiler additionally
optimizes it for the Sun UltraSPARC III/III+/IIIi/IIIi+/IV/IV+
chips. With '-mcpu=niagara', the compiler additionally optimizes
it for Sun UltraSPARC T1 chips. With '-mcpu=niagara2', the
compiler additionally optimizes it for Sun UltraSPARC T2 chips.
'-mtune=CPU_TYPE'
Set the instruction scheduling parameters for machine type
CPU_TYPE, but do not set the instruction set or register set that
the option '-mcpu=CPU_TYPE' would.
The same values for '-mcpu=CPU_TYPE' can be used for
'-mtune=CPU_TYPE', but the only useful values are those that select
a particular cpu implementation. Those are 'cypress',
'supersparc', 'hypersparc', 'f930', 'f934', 'sparclite86x',
'tsc701', 'ultrasparc', 'ultrasparc3', 'niagara', and 'niagara2'.
'-mv8plus'
'-mno-v8plus'
With '-mv8plus', GCC generates code for the SPARC-V8+ ABI. The
difference from the V8 ABI is that the global and out registers are
considered 64-bit wide. This is enabled by default on Solaris in
32-bit mode for all SPARC-V9 processors.
'-mvis'
'-mno-vis'
With '-mvis', GCC generates code that takes advantage of the
UltraSPARC Visual Instruction Set extensions. The default is
'-mno-vis'.
These '-m' options are supported in addition to the above on SPARC-V9
processors in 64-bit environments:
'-mlittle-endian'
Generate code for a processor running in little-endian mode. It is
only available for a few configurations and most notably not on
Solaris and Linux.
'-m32'
'-m64'
Generate code for a 32-bit or 64-bit environment. The 32-bit
environment sets int, long and pointer to 32 bits. The 64-bit
environment sets int to 32 bits and long and pointer to 64 bits.
'-mcmodel=medlow'
Generate code for the Medium/Low code model: 64-bit addresses,
programs must be linked in the low 32 bits of memory. Programs can
be statically or dynamically linked.
'-mcmodel=medmid'
Generate code for the Medium/Middle code model: 64-bit addresses,
programs must be linked in the low 44 bits of memory, the text and
data segments must be less than 2GB in size and the data segment
must be located within 2GB of the text segment.
'-mcmodel=medany'
Generate code for the Medium/Anywhere code model: 64-bit addresses,
programs may be linked anywhere in memory, the text and data
segments must be less than 2GB in size and the data segment must be
located within 2GB of the text segment.
'-mcmodel=embmedany'
Generate code for the Medium/Anywhere code model for embedded
systems: 64-bit addresses, the text and data segments must be less
than 2GB in size, both starting anywhere in memory (determined at
link time). The global register %g4 points to the base of the data
segment. Programs are statically linked and PIC is not supported.
'-mstack-bias'
'-mno-stack-bias'
With '-mstack-bias', GCC assumes that the stack pointer, and frame
pointer if present, are offset by -2047 which must be added back
when making stack frame references. This is the default in 64-bit
mode. Otherwise, assume no such offset is present.
These switches are supported in addition to the above on Solaris:
'-threads'
Add support for multithreading using the Solaris threads library.
This option sets flags for both the preprocessor and linker. This
option does not affect the thread safety of object code produced by
the compiler or that of libraries supplied with it.
'-pthreads'
Add support for multithreading using the POSIX threads library.
This option sets flags for both the preprocessor and linker. This
option does not affect the thread safety of object code produced by
the compiler or that of libraries supplied with it.
'-pthread'
This is a synonym for '-pthreads'.

File: gcc.info, Node: SPU Options, Next: System V Options, Prev: SPARC Options, Up: Submodel Options
3.17.32 SPU Options
-------------------
These '-m' options are supported on the SPU:
'-mwarn-reloc'
'-merror-reloc'
The loader for SPU does not handle dynamic relocations. By
default, GCC will give an error when it generates code that
requires a dynamic relocation. '-mno-error-reloc' disables the
error, '-mwarn-reloc' will generate a warning instead.
'-msafe-dma'
'-munsafe-dma'
Instructions which initiate or test completion of DMA must not be
reordered with respect to loads and stores of the memory which is
being accessed. Users typically address this problem using the
volatile keyword, but that can lead to inefficient code in places
where the memory is known to not change. Rather than mark the
memory as volatile we treat the DMA instructions as potentially
effecting all memory. With '-munsafe-dma' users must use the
volatile keyword to protect memory accesses.
'-mbranch-hints'
By default, GCC will generate a branch hint instruction to avoid
pipeline stalls for always taken or probably taken branches. A
hint will not be generated closer than 8 instructions away from its
branch. There is little reason to disable them, except for
debugging purposes, or to make an object a little bit smaller.
'-msmall-mem'
'-mlarge-mem'
By default, GCC generates code assuming that addresses are never
larger than 18 bits. With '-mlarge-mem' code is generated that
assumes a full 32 bit address.
'-mstdmain'
By default, GCC links against startup code that assumes the
SPU-style main function interface (which has an unconventional
parameter list). With '-mstdmain', GCC will link your program
against startup code that assumes a C99-style interface to 'main',
including a local copy of 'argv' strings.
'-mfixed-range=REGISTER-RANGE'
Generate code treating the given register range as fixed registers.
A fixed register is one that the register allocator can not use.
This is useful when compiling kernel code. A register range is
specified as two registers separated by a dash. Multiple register
ranges can be specified separated by a comma.
'-mdual-nops'
'-mdual-nops=N'
By default, GCC will insert nops to increase dual issue when it
expects it to increase performance. N can be a value from 0 to 10.
A smaller N will insert fewer nops. 10 is the default, 0 is the
same as '-mno-dual-nops'. Disabled with '-Os'.
'-mhint-max-nops=N'
Maximum number of nops to insert for a branch hint. A branch hint
must be at least 8 instructions away from the branch it is
effecting. GCC will insert up to N nops to enforce this, otherwise
it will not generate the branch hint.
'-mhint-max-distance=N'
The encoding of the branch hint instruction limits the hint to be
within 256 instructions of the branch it is effecting. By default,
GCC makes sure it is within 125.
'-msafe-hints'
Work around a hardware bug which causes the SPU to stall
indefinitely. By default, GCC will insert the 'hbrp' instruction
to make sure this stall won't happen.

File: gcc.info, Node: System V Options, Next: V850 Options, Prev: SPU Options, Up: Submodel Options
3.17.33 Options for System V
----------------------------
These additional options are available on System V Release 4 for
compatibility with other compilers on those systems:
'-G'
Create a shared object. It is recommended that '-symbolic' or
'-shared' be used instead.
'-Qy'
Identify the versions of each tool used by the compiler, in a
'.ident' assembler directive in the output.
'-Qn'
Refrain from adding '.ident' directives to the output file (this is
the default).
'-YP,DIRS'
Search the directories DIRS, and no others, for libraries specified
with '-l'.
'-Ym,DIR'
Look in the directory DIR to find the M4 preprocessor. The
assembler uses this option.

File: gcc.info, Node: V850 Options, Next: VAX Options, Prev: System V Options, Up: Submodel Options
3.17.34 V850 Options
--------------------
These '-m' options are defined for V850 implementations:
'-mlong-calls'
'-mno-long-calls'
Treat all calls as being far away (near). If calls are assumed to
be far away, the compiler will always load the functions address up
into a register, and call indirect through the pointer.
'-mno-ep'
'-mep'
Do not optimize (do optimize) basic blocks that use the same index
pointer 4 or more times to copy pointer into the 'ep' register, and
use the shorter 'sld' and 'sst' instructions. The '-mep' option is
on by default if you optimize.
'-mno-prolog-function'
'-mprolog-function'
Do not use (do use) external functions to save and restore
registers at the prologue and epilogue of a function. The external
functions are slower, but use less code space if more than one
function saves the same number of registers. The
'-mprolog-function' option is on by default if you optimize.
'-mspace'
Try to make the code as small as possible. At present, this just
turns on the '-mep' and '-mprolog-function' options.
'-mtda=N'
Put static or global variables whose size is N bytes or less into
the tiny data area that register 'ep' points to. The tiny data
area can hold up to 256 bytes in total (128 bytes for byte
references).
'-msda=N'
Put static or global variables whose size is N bytes or less into
the small data area that register 'gp' points to. The small data
area can hold up to 64 kilobytes.
'-mzda=N'
Put static or global variables whose size is N bytes or less into
the first 32 kilobytes of memory.
'-mv850'
Specify that the target processor is the V850.
'-mbig-switch'
Generate code suitable for big switch tables. Use this option only
if the assembler/linker complain about out of range branches within
a switch table.
'-mapp-regs'
This option will cause r2 and r5 to be used in the code generated
by the compiler. This setting is the default.
'-mno-app-regs'
This option will cause r2 and r5 to be treated as fixed registers.
'-mv850e1'
Specify that the target processor is the V850E1. The preprocessor
constants '__v850e1__' and '__v850e__' will be defined if this
option is used.
'-mv850e'
Specify that the target processor is the V850E. The preprocessor
constant '__v850e__' will be defined if this option is used.
If neither '-mv850' nor '-mv850e' nor '-mv850e1' are defined then a
default target processor will be chosen and the relevant
'__v850*__' preprocessor constant will be defined.
The preprocessor constants '__v850' and '__v851__' are always
defined, regardless of which processor variant is the target.
'-mdisable-callt'
This option will suppress generation of the CALLT instruction for
the v850e and v850e1 flavors of the v850 architecture. The default
is '-mno-disable-callt' which allows the CALLT instruction to be
used.

File: gcc.info, Node: VAX Options, Next: VxWorks Options, Prev: V850 Options, Up: Submodel Options
3.17.35 VAX Options
-------------------
These '-m' options are defined for the VAX:
'-munix'
Do not output certain jump instructions ('aobleq' and so on) that
the Unix assembler for the VAX cannot handle across long ranges.
'-mgnu'
Do output those jump instructions, on the assumption that you will
assemble with the GNU assembler.
'-mg'
Output code for g-format floating point numbers instead of
d-format.

File: gcc.info, Node: VxWorks Options, Next: x86-64 Options, Prev: VAX Options, Up: Submodel Options
3.17.36 VxWorks Options
-----------------------
The options in this section are defined for all VxWorks targets.
Options specific to the target hardware are listed with the other
options for that target.
'-mrtp'
GCC can generate code for both VxWorks kernels and real time
processes (RTPs). This option switches from the former to the
latter. It also defines the preprocessor macro '__RTP__'.
'-non-static'
Link an RTP executable against shared libraries rather than static
libraries. The options '-static' and '-shared' can also be used
for RTPs (*note Link Options::); '-static' is the default.
'-Bstatic'
'-Bdynamic'
These options are passed down to the linker. They are defined for
compatibility with Diab.
'-Xbind-lazy'
Enable lazy binding of function calls. This option is equivalent
to '-Wl,-z,now' and is defined for compatibility with Diab.
'-Xbind-now'
Disable lazy binding of function calls. This option is the default
and is defined for compatibility with Diab.

File: gcc.info, Node: x86-64 Options, Next: Xstormy16 Options, Prev: VxWorks Options, Up: Submodel Options
3.17.37 x86-64 Options
----------------------
These are listed under *Note i386 and x86-64 Options::.

File: gcc.info, Node: Xstormy16 Options, Next: Xtensa Options, Prev: x86-64 Options, Up: Submodel Options
3.17.38 Xstormy16 Options
-------------------------
These options are defined for Xstormy16:
'-msim'
Choose startup files and linker script suitable for the simulator.

File: gcc.info, Node: Xtensa Options, Next: zSeries Options, Prev: Xstormy16 Options, Up: Submodel Options
3.17.39 Xtensa Options
----------------------
These options are supported for Xtensa targets:
'-mconst16'
'-mno-const16'
Enable or disable use of 'CONST16' instructions for loading
constant values. The 'CONST16' instruction is currently not a
standard option from Tensilica. When enabled, 'CONST16'
instructions are always used in place of the standard 'L32R'
instructions. The use of 'CONST16' is enabled by default only if
the 'L32R' instruction is not available.
'-mfused-madd'
'-mno-fused-madd'
Enable or disable use of fused multiply/add and multiply/subtract
instructions in the floating-point option. This has no effect if
the floating-point option is not also enabled. Disabling fused
multiply/add and multiply/subtract instructions forces the compiler
to use separate instructions for the multiply and add/subtract
operations. This may be desirable in some cases where strict IEEE
754-compliant results are required: the fused multiply add/subtract
instructions do not round the intermediate result, thereby
producing results with _more_ bits of precision than specified by
the IEEE standard. Disabling fused multiply add/subtract
instructions also ensures that the program output is not sensitive
to the compiler's ability to combine multiply and add/subtract
operations.
'-mtext-section-literals'
'-mno-text-section-literals'
Control the treatment of literal pools. The default is
'-mno-text-section-literals', which places literals in a separate
section in the output file. This allows the literal pool to be
placed in a data RAM/ROM, and it also allows the linker to combine
literal pools from separate object files to remove redundant
literals and improve code size. With '-mtext-section-literals',
the literals are interspersed in the text section in order to keep
them as close as possible to their references. This may be
necessary for large assembly files.
'-mtarget-align'
'-mno-target-align'
When this option is enabled, GCC instructs the assembler to
automatically align instructions to reduce branch penalties at the
expense of some code density. The assembler attempts to widen
density instructions to align branch targets and the instructions
following call instructions. If there are not enough preceding
safe density instructions to align a target, no widening will be
performed. The default is '-mtarget-align'. These options do not
affect the treatment of auto-aligned instructions like 'LOOP',
which the assembler will always align, either by widening density
instructions or by inserting no-op instructions.
'-mlongcalls'
'-mno-longcalls'
When this option is enabled, GCC instructs the assembler to
translate direct calls to indirect calls unless it can determine
that the target of a direct call is in the range allowed by the
call instruction. This translation typically occurs for calls to
functions in other source files. Specifically, the assembler
translates a direct 'CALL' instruction into an 'L32R' followed by a
'CALLX' instruction. The default is '-mno-longcalls'. This option
should be used in programs where the call target can potentially be
out of range. This option is implemented in the assembler, not the
compiler, so the assembly code generated by GCC will still show
direct call instructions--look at the disassembled object code to
see the actual instructions. Note that the assembler will use an
indirect call for every cross-file call, not just those that really
will be out of range.

File: gcc.info, Node: zSeries Options, Prev: Xtensa Options, Up: Submodel Options
3.17.40 zSeries Options
-----------------------
These are listed under *Note S/390 and zSeries Options::.

File: gcc.info, Node: Code Gen Options, Next: Environment Variables, Prev: Submodel Options, Up: Invoking GCC
3.18 Options for Code Generation Conventions
============================================
These machine-independent options control the interface conventions used
in code generation.
Most of them have both positive and negative forms; the negative form
of '-ffoo' would be '-fno-foo'. In the table below, only one of the
forms is listed--the one which is not the default. You can figure out
the other form by either removing 'no-' or adding it.
'-fbounds-check'
For front-ends that support it, generate additional code to check
that indices used to access arrays are within the declared range.
This is currently only supported by the Java and Fortran
front-ends, where this option defaults to true and false
respectively.
'-ftrapv'
This option generates traps for signed overflow on addition,
subtraction, multiplication operations.
'-fwrapv'
This option instructs the compiler to assume that signed arithmetic
overflow of addition, subtraction and multiplication wraps around
using twos-complement representation. This flag enables some
optimizations and disables others. This option is enabled by
default for the Java front-end, as required by the Java language
specification.
'-fexceptions'
Enable exception handling. Generates extra code needed to
propagate exceptions. For some targets, this implies GCC will
generate frame unwind information for all functions, which can
produce significant data size overhead, although it does not affect
execution. If you do not specify this option, GCC will enable it
by default for languages like C++ which normally require exception
handling, and disable it for languages like C that do not normally
require it. However, you may need to enable this option when
compiling C code that needs to interoperate properly with exception
handlers written in C++. You may also wish to disable this option
if you are compiling older C++ programs that don't use exception
handling.
'-fnon-call-exceptions'
Generate code that allows trapping instructions to throw
exceptions. Note that this requires platform-specific runtime
support that does not exist everywhere. Moreover, it only allows
_trapping_ instructions to throw exceptions, i.e. memory references
or floating point instructions. It does not allow exceptions to be
thrown from arbitrary signal handlers such as 'SIGALRM'.
'-funwind-tables'
Similar to '-fexceptions', except that it will just generate any
needed static data, but will not affect the generated code in any
other way. You will normally not enable this option; instead, a
language processor that needs this handling would enable it on your
behalf.
'-fasynchronous-unwind-tables'
Generate unwind table in dwarf2 format, if supported by target
machine. The table is exact at each instruction boundary, so it
can be used for stack unwinding from asynchronous events (such as
debugger or garbage collector).
'-fpcc-struct-return'
Return "short" 'struct' and 'union' values in memory like longer
ones, rather than in registers. This convention is less efficient,
but it has the advantage of allowing intercallability between
GCC-compiled files and files compiled with other compilers,
particularly the Portable C Compiler (pcc).
The precise convention for returning structures in memory depends
on the target configuration macros.
Short structures and unions are those whose size and alignment
match that of some integer type.
*Warning:* code compiled with the '-fpcc-struct-return' switch is
not binary compatible with code compiled with the
'-freg-struct-return' switch. Use it to conform to a non-default
application binary interface.
'-freg-struct-return'
Return 'struct' and 'union' values in registers when possible.
This is more efficient for small structures than
'-fpcc-struct-return'.
If you specify neither '-fpcc-struct-return' nor
'-freg-struct-return', GCC defaults to whichever convention is
standard for the target. If there is no standard convention, GCC
defaults to '-fpcc-struct-return', except on targets where GCC is
the principal compiler. In those cases, we can choose the
standard, and we chose the more efficient register return
alternative.
*Warning:* code compiled with the '-freg-struct-return' switch is
not binary compatible with code compiled with the
'-fpcc-struct-return' switch. Use it to conform to a non-default
application binary interface.
'-fshort-enums'
Allocate to an 'enum' type only as many bytes as it needs for the
declared range of possible values. Specifically, the 'enum' type
will be equivalent to the smallest integer type which has enough
room.
*Warning:* the '-fshort-enums' switch causes GCC to generate code
that is not binary compatible with code generated without that
switch. Use it to conform to a non-default application binary
interface.
'-fshort-double'
Use the same size for 'double' as for 'float'.
*Warning:* the '-fshort-double' switch causes GCC to generate code
that is not binary compatible with code generated without that
switch. Use it to conform to a non-default application binary
interface.
'-fshort-wchar'
Override the underlying type for 'wchar_t' to be 'short unsigned
int' instead of the default for the target. This option is useful
for building programs to run under WINE.
*Warning:* the '-fshort-wchar' switch causes GCC to generate code
that is not binary compatible with code generated without that
switch. Use it to conform to a non-default application binary
interface.
'-fno-common'
In C, allocate even uninitialized global variables in the data
section of the object file, rather than generating them as common
blocks. This has the effect that if the same variable is declared
(without 'extern') in two different compilations, you will get an
error when you link them. The only reason this might be useful is
if you wish to verify that the program will work on other systems
which always work this way.
'-fno-ident'
Ignore the '#ident' directive.
'-finhibit-size-directive'
Don't output a '.size' assembler directive, or anything else that
would cause trouble if the function is split in the middle, and the
two halves are placed at locations far apart in memory. This
option is used when compiling 'crtstuff.c'; you should not need to
use it for anything else.
'-fverbose-asm'
Put extra commentary information in the generated assembly code to
make it more readable. This option is generally only of use to
those who actually need to read the generated assembly code
(perhaps while debugging the compiler itself).
'-fno-verbose-asm', the default, causes the extra information to be
omitted and is useful when comparing two assembler files.
'-frecord-gcc-switches'
This switch causes the command line that was used to invoke the
compiler to be recorded into the object file that is being created.
This switch is only implemented on some targets and the exact
format of the recording is target and binary file format dependent,
but it usually takes the form of a section containing ASCII text.
This switch is related to the '-fverbose-asm' switch, but that
switch only records information in the assembler output file as
comments, so it never reaches the object file.
'-fpic'
Generate position-independent code (PIC) suitable for use in a
shared library, if supported for the target machine. Such code
accesses all constant addresses through a global offset table
(GOT). The dynamic loader resolves the GOT entries when the
program starts (the dynamic loader is not part of GCC; it is part
of the operating system). If the GOT size for the linked
executable exceeds a machine-specific maximum size, you get an
error message from the linker indicating that '-fpic' does not
work; in that case, recompile with '-fPIC' instead. (These
maximums are 8k on the SPARC and 32k on the m68k and RS/6000. The
386 has no such limit.)
Position-independent code requires special support, and therefore
works only on certain machines. For the 386, GCC supports PIC for
System V but not for the Sun 386i. Code generated for the IBM
RS/6000 is always position-independent.
When this flag is set, the macros '__pic__' and '__PIC__' are
defined to 1.
'-fPIC'
If supported for the target machine, emit position-independent
code, suitable for dynamic linking and avoiding any limit on the
size of the global offset table. This option makes a difference on
the m68k, PowerPC and SPARC.
Position-independent code requires special support, and therefore
works only on certain machines.
When this flag is set, the macros '__pic__' and '__PIC__' are
defined to 2.
'-fpie'
'-fPIE'
These options are similar to '-fpic' and '-fPIC', but generated
position independent code can be only linked into executables.
Usually these options are used when '-pie' GCC option will be used
during linking.
'-fpie' and '-fPIE' both define the macros '__pie__' and '__PIE__'.
The macros have the value 1 for '-fpie' and 2 for '-fPIE'.
'-fno-jump-tables'
Do not use jump tables for switch statements even where it would be
more efficient than other code generation strategies. This option
is of use in conjunction with '-fpic' or '-fPIC' for building code
which forms part of a dynamic linker and cannot reference the
address of a jump table. On some targets, jump tables do not
require a GOT and this option is not needed.
'-ffixed-REG'
Treat the register named REG as a fixed register; generated code
should never refer to it (except perhaps as a stack pointer, frame
pointer or in some other fixed role).
REG must be the name of a register. The register names accepted
are machine-specific and are defined in the 'REGISTER_NAMES' macro
in the machine description macro file.
This flag does not have a negative form, because it specifies a
three-way choice.
'-fcall-used-REG'
Treat the register named REG as an allocable register that is
clobbered by function calls. It may be allocated for temporaries
or variables that do not live across a call. Functions compiled
this way will not save and restore the register REG.
It is an error to used this flag with the frame pointer or stack
pointer. Use of this flag for other registers that have fixed
pervasive roles in the machine's execution model will produce
disastrous results.
This flag does not have a negative form, because it specifies a
three-way choice.
'-fcall-saved-REG'
Treat the register named REG as an allocable register saved by
functions. It may be allocated even for temporaries or variables
that live across a call. Functions compiled this way will save and
restore the register REG if they use it.
It is an error to used this flag with the frame pointer or stack
pointer. Use of this flag for other registers that have fixed
pervasive roles in the machine's execution model will produce
disastrous results.
A different sort of disaster will result from the use of this flag
for a register in which function values may be returned.
This flag does not have a negative form, because it specifies a
three-way choice.
'-fpack-struct[=N]'
Without a value specified, pack all structure members together
without holes. When a value is specified (which must be a small
power of two), pack structure members according to this value,
representing the maximum alignment (that is, objects with default
alignment requirements larger than this will be output potentially
unaligned at the next fitting location.
*Warning:* the '-fpack-struct' switch causes GCC to generate code
that is not binary compatible with code generated without that
switch. Additionally, it makes the code suboptimal. Use it to
conform to a non-default application binary interface.
'-finstrument-functions'
Generate instrumentation calls for entry and exit to functions.
Just after function entry and just before function exit, the
following profiling functions will be called with the address of
the current function and its call site. (On some platforms,
'__builtin_return_address' does not work beyond the current
function, so the call site information may not be available to the
profiling functions otherwise.)
void __cyg_profile_func_enter (void *this_fn,
void *call_site);
void __cyg_profile_func_exit (void *this_fn,
void *call_site);
The first argument is the address of the start of the current
function, which may be looked up exactly in the symbol table.
This instrumentation is also done for functions expanded inline in
other functions. The profiling calls will indicate where,
conceptually, the inline function is entered and exited. This
means that addressable versions of such functions must be
available. If all your uses of a function are expanded inline,
this may mean an additional expansion of code size. If you use
'extern inline' in your C code, an addressable version of such
functions must be provided. (This is normally the case anyways,
but if you get lucky and the optimizer always expands the functions
inline, you might have gotten away without providing static
copies.)
A function may be given the attribute 'no_instrument_function', in
which case this instrumentation will not be done. This can be
used, for example, for the profiling functions listed above,
high-priority interrupt routines, and any functions from which the
profiling functions cannot safely be called (perhaps signal
handlers, if the profiling routines generate output or allocate
memory).
'-finstrument-functions-exclude-file-list=FILE,FILE,...'
Set the list of functions that are excluded from instrumentation
(see the description of '-finstrument-functions'). If the file
that contains a function definition matches with one of FILE, then
that function is not instrumented. The match is done on
substrings: if the FILE parameter is a substring of the file name,
it is considered to be a match.
For example,
'-finstrument-functions-exclude-file-list=/bits/stl,include/sys'
will exclude any inline function defined in files whose pathnames
contain '/bits/stl' or 'include/sys'.
If, for some reason, you want to include letter '','' in one of
SYM, write ''\,''. For example,
'-finstrument-functions-exclude-file-list='\,\,tmp'' (note the
single quote surrounding the option).
'-finstrument-functions-exclude-function-list=SYM,SYM,...'
This is similar to '-finstrument-functions-exclude-file-list', but
this option sets the list of function names to be excluded from
instrumentation. The function name to be matched is its
user-visible name, such as 'vector<int> blah(const vector<int> &)',
not the internal mangled name (e.g., '_Z4blahRSt6vectorIiSaIiEE').
The match is done on substrings: if the SYM parameter is a
substring of the function name, it is considered to be a match.
'-fstack-check'
Generate code to verify that you do not go beyond the boundary of
the stack. You should specify this flag if you are running in an
environment with multiple threads, but only rarely need to specify
it in a single-threaded environment since stack overflow is
automatically detected on nearly all systems if there is only one
stack.
Note that this switch does not actually cause checking to be done;
the operating system must do that. The switch causes generation of
code to ensure that the operating system sees the stack being
extended.
'-fstack-limit-register=REG'
'-fstack-limit-symbol=SYM'
'-fno-stack-limit'
Generate code to ensure that the stack does not grow beyond a
certain value, either the value of a register or the address of a
symbol. If the stack would grow beyond the value, a signal is
raised. For most targets, the signal is raised before the stack
overruns the boundary, so it is possible to catch the signal
without taking special precautions.
For instance, if the stack starts at absolute address '0x80000000'
and grows downwards, you can use the flags
'-fstack-limit-symbol=__stack_limit' and
'-Wl,--defsym,__stack_limit=0x7ffe0000' to enforce a stack limit of
128KB. Note that this may only work with the GNU linker.
'-fargument-alias'
'-fargument-noalias'
'-fargument-noalias-global'
'-fargument-noalias-anything'
Specify the possible relationships among parameters and between
parameters and global data.
'-fargument-alias' specifies that arguments (parameters) may alias
each other and may alias global storage.
'-fargument-noalias' specifies that arguments do not alias each
other, but may alias global storage.
'-fargument-noalias-global' specifies that arguments do not alias
each other and do not alias global storage.
'-fargument-noalias-anything' specifies that arguments do not alias
any other storage.
Each language will automatically use whatever option is required by
the language standard. You should not need to use these options
yourself.
'-fleading-underscore'
This option and its counterpart, '-fno-leading-underscore',
forcibly change the way C symbols are represented in the object
file. One use is to help link with legacy assembly code.
*Warning:* the '-fleading-underscore' switch causes GCC to generate
code that is not binary compatible with code generated without that
switch. Use it to conform to a non-default application binary
interface. Not all targets provide complete support for this
switch.
'-ftls-model=MODEL'
Alter the thread-local storage model to be used (*note
Thread-Local::). The MODEL argument should be one of
'global-dynamic', 'local-dynamic', 'initial-exec' or 'local-exec'.
The default without '-fpic' is 'initial-exec'; with '-fpic' the
default is 'global-dynamic'.
'-fvisibility=DEFAULT|INTERNAL|HIDDEN|PROTECTED'
Set the default ELF image symbol visibility to the specified
option--all symbols will be marked with this unless overridden
within the code. Using this feature can very substantially improve
linking and load times of shared object libraries, produce more
optimized code, provide near-perfect API export and prevent symbol
clashes. It is *strongly* recommended that you use this in any
shared objects you distribute.
Despite the nomenclature, 'default' always means public ie;
available to be linked against from outside the shared object.
'protected' and 'internal' are pretty useless in real-world usage
so the only other commonly used option will be 'hidden'. The
default if '-fvisibility' isn't specified is 'default', i.e., make
every symbol public--this causes the same behavior as previous
versions of GCC.
A good explanation of the benefits offered by ensuring ELF symbols
have the correct visibility is given by "How To Write Shared
Libraries" by Ulrich Drepper (which can be found at
<http://people.redhat.com/~drepper/>)--however a superior solution
made possible by this option to marking things hidden when the
default is public is to make the default hidden and mark things
public. This is the norm with DLL's on Windows and with
'-fvisibility=hidden' and '__attribute__ ((visibility("default")))'
instead of '__declspec(dllexport)' you get almost identical
semantics with identical syntax. This is a great boon to those
working with cross-platform projects.
For those adding visibility support to existing code, you may find
'#pragma GCC visibility' of use. This works by you enclosing the
declarations you wish to set visibility for with (for example)
'#pragma GCC visibility push(hidden)' and '#pragma GCC visibility
pop'. Bear in mind that symbol visibility should be viewed *as
part of the API interface contract* and thus all new code should
always specify visibility when it is not the default ie;
declarations only for use within the local DSO should *always* be
marked explicitly as hidden as so to avoid PLT indirection
overheads--making this abundantly clear also aids readability and
self-documentation of the code. Note that due to ISO C++
specification requirements, operator new and operator delete must
always be of default visibility.
Be aware that headers from outside your project, in particular
system headers and headers from any other library you use, may not
be expecting to be compiled with visibility other than the default.
You may need to explicitly say '#pragma GCC visibility
push(default)' before including any such headers.
'extern' declarations are not affected by '-fvisibility', so a lot
of code can be recompiled with '-fvisibility=hidden' with no
modifications. However, this means that calls to 'extern'
functions with no explicit visibility will use the PLT, so it is
more effective to use '__attribute ((visibility))' and/or '#pragma
GCC visibility' to tell the compiler which 'extern' declarations
should be treated as hidden.
Note that '-fvisibility' does affect C++ vague linkage entities.
This means that, for instance, an exception class that will be
thrown between DSOs must be explicitly marked with default
visibility so that the 'type_info' nodes will be unified between
the DSOs.
An overview of these techniques, their benefits and how to use them
is at <http://gcc.gnu.org/wiki/Visibility>.

File: gcc.info, Node: Environment Variables, Next: Precompiled Headers, Prev: Code Gen Options, Up: Invoking GCC
3.19 Environment Variables Affecting GCC
========================================
This section describes several environment variables that affect how GCC
operates. Some of them work by specifying directories or prefixes to
use when searching for various kinds of files. Some are used to specify
other aspects of the compilation environment.
Note that you can also specify places to search using options such as
'-B', '-I' and '-L' (*note Directory Options::). These take precedence
over places specified using environment variables, which in turn take
precedence over those specified by the configuration of GCC. *Note
Controlling the Compilation Driver 'gcc': (gccint)Driver.
'LANG'
'LC_CTYPE'
'LC_MESSAGES'
'LC_ALL'
These environment variables control the way that GCC uses
localization information that allow GCC to work with different
national conventions. GCC inspects the locale categories
'LC_CTYPE' and 'LC_MESSAGES' if it has been configured to do so.
These locale categories can be set to any value supported by your
installation. A typical value is 'en_GB.UTF-8' for English in the
United Kingdom encoded in UTF-8.
The 'LC_CTYPE' environment variable specifies character
classification. GCC uses it to determine the character boundaries
in a string; this is needed for some multibyte encodings that
contain quote and escape characters that would otherwise be
interpreted as a string end or escape.
The 'LC_MESSAGES' environment variable specifies the language to
use in diagnostic messages.
If the 'LC_ALL' environment variable is set, it overrides the value
of 'LC_CTYPE' and 'LC_MESSAGES'; otherwise, 'LC_CTYPE' and
'LC_MESSAGES' default to the value of the 'LANG' environment
variable. If none of these variables are set, GCC defaults to
traditional C English behavior.
'TMPDIR'
If 'TMPDIR' is set, it specifies the directory to use for temporary
files. GCC uses temporary files to hold the output of one stage of
compilation which is to be used as input to the next stage: for
example, the output of the preprocessor, which is the input to the
compiler proper.
'GCC_EXEC_PREFIX'
If 'GCC_EXEC_PREFIX' is set, it specifies a prefix to use in the
names of the subprograms executed by the compiler. No slash is
added when this prefix is combined with the name of a subprogram,
but you can specify a prefix that ends with a slash if you wish.
If 'GCC_EXEC_PREFIX' is not set, GCC will attempt to figure out an
appropriate prefix to use based on the pathname it was invoked
with.
If GCC cannot find the subprogram using the specified prefix, it
tries looking in the usual places for the subprogram.
The default value of 'GCC_EXEC_PREFIX' is 'PREFIX/lib/gcc/' where
PREFIX is the prefix to the installed compiler. In many cases
PREFIX is the value of 'prefix' when you ran the 'configure'
script.
Other prefixes specified with '-B' take precedence over this
prefix.
This prefix is also used for finding files such as 'crt0.o' that
are used for linking.
In addition, the prefix is used in an unusual way in finding the
directories to search for header files. For each of the standard
directories whose name normally begins with '/usr/local/lib/gcc'
(more precisely, with the value of 'GCC_INCLUDE_DIR'), GCC tries
replacing that beginning with the specified prefix to produce an
alternate directory name. Thus, with '-Bfoo/', GCC will search
'foo/bar' where it would normally search '/usr/local/lib/bar'.
These alternate directories are searched first; the standard
directories come next. If a standard directory begins with the
configured PREFIX then the value of PREFIX is replaced by
'GCC_EXEC_PREFIX' when looking for header files.
'COMPILER_PATH'
The value of 'COMPILER_PATH' is a colon-separated list of
directories, much like 'PATH'. GCC tries the directories thus
specified when searching for subprograms, if it can't find the
subprograms using 'GCC_EXEC_PREFIX'.
'LIBRARY_PATH'
The value of 'LIBRARY_PATH' is a colon-separated list of
directories, much like 'PATH'. When configured as a native
compiler, GCC tries the directories thus specified when searching
for special linker files, if it can't find them using
'GCC_EXEC_PREFIX'. Linking using GCC also uses these directories
when searching for ordinary libraries for the '-l' option (but
directories specified with '-L' come first).
'LANG'
This variable is used to pass locale information to the compiler.
One way in which this information is used is to determine the
character set to be used when character literals, string literals
and comments are parsed in C and C++. When the compiler is
configured to allow multibyte characters, the following values for
'LANG' are recognized:
'C-JIS'
Recognize JIS characters.
'C-SJIS'
Recognize SJIS characters.
'C-EUCJP'
Recognize EUCJP characters.
If 'LANG' is not defined, or if it has some other value, then the
compiler will use mblen and mbtowc as defined by the default locale
to recognize and translate multibyte characters.
Some additional environments variables affect the behavior of the
preprocessor.
'CPATH'
'C_INCLUDE_PATH'
'CPLUS_INCLUDE_PATH'
'OBJC_INCLUDE_PATH'
Each variable's value is a list of directories separated by a
special character, much like 'PATH', in which to look for header
files. The special character, 'PATH_SEPARATOR', is
target-dependent and determined at GCC build time. For Microsoft
Windows-based targets it is a semicolon, and for almost all other
targets it is a colon.
'CPATH' specifies a list of directories to be searched as if
specified with '-I', but after any paths given with '-I' options on
the command line. This environment variable is used regardless of
which language is being preprocessed.
The remaining environment variables apply only when preprocessing
the particular language indicated. Each specifies a list of
directories to be searched as if specified with '-isystem', but
after any paths given with '-isystem' options on the command line.
In all these variables, an empty element instructs the compiler to
search its current working directory. Empty elements can appear at
the beginning or end of a path. For instance, if the value of
'CPATH' is ':/special/include', that has the same effect as
'-I. -I/special/include'.
'DEPENDENCIES_OUTPUT'
If this variable is set, its value specifies how to output
dependencies for Make based on the non-system header files
processed by the compiler. System header files are ignored in the
dependency output.
The value of 'DEPENDENCIES_OUTPUT' can be just a file name, in
which case the Make rules are written to that file, guessing the
target name from the source file name. Or the value can have the
form 'FILE TARGET', in which case the rules are written to file
FILE using TARGET as the target name.
In other words, this environment variable is equivalent to
combining the options '-MM' and '-MF' (*note Preprocessor
Options::), with an optional '-MT' switch too.
'SUNPRO_DEPENDENCIES'
This variable is the same as 'DEPENDENCIES_OUTPUT' (see above),
except that system header files are not ignored, so it implies '-M'
rather than '-MM'. However, the dependence on the main input file
is omitted. *Note Preprocessor Options::.

File: gcc.info, Node: Precompiled Headers, Next: Running Protoize, Prev: Environment Variables, Up: Invoking GCC
3.20 Using Precompiled Headers
==============================
Often large projects have many header files that are included in every
source file. The time the compiler takes to process these header files
over and over again can account for nearly all of the time required to
build the project. To make builds faster, GCC allows users to
'precompile' a header file; then, if builds can use the precompiled
header file they will be much faster.
To create a precompiled header file, simply compile it as you would any
other file, if necessary using the '-x' option to make the driver treat
it as a C or C++ header file. You will probably want to use a tool like
'make' to keep the precompiled header up-to-date when the headers it
contains change.
A precompiled header file will be searched for when '#include' is seen
in the compilation. As it searches for the included file (*note Search
Path: (cpp)Search Path.) the compiler looks for a precompiled header in
each directory just before it looks for the include file in that
directory. The name searched for is the name specified in the
'#include' with '.gch' appended. If the precompiled header file can't
be used, it is ignored.
For instance, if you have '#include "all.h"', and you have 'all.h.gch'
in the same directory as 'all.h', then the precompiled header file will
be used if possible, and the original header will be used otherwise.
Alternatively, you might decide to put the precompiled header file in a
directory and use '-I' to ensure that directory is searched before (or
instead of) the directory containing the original header. Then, if you
want to check that the precompiled header file is always used, you can
put a file of the same name as the original header in this directory
containing an '#error' command.
This also works with '-include'. So yet another way to use precompiled
headers, good for projects not designed with precompiled header files in
mind, is to simply take most of the header files used by a project,
include them from another header file, precompile that header file, and
'-include' the precompiled header. If the header files have guards
against multiple inclusion, they will be skipped because they've already
been included (in the precompiled header).
If you need to precompile the same header file for different languages,
targets, or compiler options, you can instead make a _directory_ named
like 'all.h.gch', and put each precompiled header in the directory,
perhaps using '-o'. It doesn't matter what you call the files in the
directory, every precompiled header in the directory will be considered.
The first precompiled header encountered in the directory that is valid
for this compilation will be used; they're searched in no particular
order.
There are many other possibilities, limited only by your imagination,
good sense, and the constraints of your build system.
A precompiled header file can be used only when these conditions apply:
* Only one precompiled header can be used in a particular
compilation.
* A precompiled header can't be used once the first C token is seen.
You can have preprocessor directives before a precompiled header;
you can even include a precompiled header from inside another
header, so long as there are no C tokens before the '#include'.
* The precompiled header file must be produced for the same language
as the current compilation. You can't use a C precompiled header
for a C++ compilation.
* The precompiled header file must have been produced by the same
compiler binary as the current compilation is using.
* Any macros defined before the precompiled header is included must
either be defined in the same way as when the precompiled header
was generated, or must not affect the precompiled header, which
usually means that they don't appear in the precompiled header at
all.
The '-D' option is one way to define a macro before a precompiled
header is included; using a '#define' can also do it. There are
also some options that define macros implicitly, like '-O' and
'-Wdeprecated'; the same rule applies to macros defined this way.
* If debugging information is output when using the precompiled
header, using '-g' or similar, the same kind of debugging
information must have been output when building the precompiled
header. However, a precompiled header built using '-g' can be used
in a compilation when no debugging information is being output.
* The same '-m' options must generally be used when building and
using the precompiled header. *Note Submodel Options::, for any
cases where this rule is relaxed.
* Each of the following options must be the same when building and
using the precompiled header:
-fexceptions -funit-at-a-time
* Some other command-line options starting with '-f', '-p', or '-O'
must be defined in the same way as when the precompiled header was
generated. At present, it's not clear which options are safe to
change and which are not; the safest choice is to use exactly the
same options when generating and using the precompiled header. The
following are known to be safe:
-fmessage-length= -fpreprocessed -fsched-interblock
-fsched-spec -fsched-spec-load -fsched-spec-load-dangerous
-fsched-verbose=<number> -fschedule-insns -fvisibility=
-pedantic-errors
For all of these except the last, the compiler will automatically
ignore the precompiled header if the conditions aren't met. If you find
an option combination that doesn't work and doesn't cause the
precompiled header to be ignored, please consider filing a bug report,
see *note Bugs::.
If you do use differing options when generating and using the
precompiled header, the actual behavior will be a mixture of the
behavior for the options. For instance, if you use '-g' to generate the
precompiled header but not when using it, you may or may not get
debugging information for routines in the precompiled header.

File: gcc.info, Node: Running Protoize, Prev: Precompiled Headers, Up: Invoking GCC
3.21 Running Protoize
=====================
The program 'protoize' is an optional part of GCC. You can use it to
add prototypes to a program, thus converting the program to ISO C in one
respect. The companion program 'unprotoize' does the reverse: it
removes argument types from any prototypes that are found.
When you run these programs, you must specify a set of source files as
command line arguments. The conversion programs start out by compiling
these files to see what functions they define. The information gathered
about a file FOO is saved in a file named 'FOO.X'.
After scanning comes actual conversion. The specified files are all
eligible to be converted; any files they include (whether sources or
just headers) are eligible as well.
But not all the eligible files are converted. By default, 'protoize'
and 'unprotoize' convert only source and header files in the current
directory. You can specify additional directories whose files should be
converted with the '-d DIRECTORY' option. You can also specify
particular files to exclude with the '-x FILE' option. A file is
converted if it is eligible, its directory name matches one of the
specified directory names, and its name within the directory has not
been excluded.
Basic conversion with 'protoize' consists of rewriting most function
definitions and function declarations to specify the types of the
arguments. The only ones not rewritten are those for varargs functions.
'protoize' optionally inserts prototype declarations at the beginning
of the source file, to make them available for any calls that precede
the function's definition. Or it can insert prototype declarations with
block scope in the blocks where undeclared functions are called.
Basic conversion with 'unprotoize' consists of rewriting most function
declarations to remove any argument types, and rewriting function
definitions to the old-style pre-ISO form.
Both conversion programs print a warning for any function declaration
or definition that they can't convert. You can suppress these warnings
with '-q'.
The output from 'protoize' or 'unprotoize' replaces the original source
file. The original file is renamed to a name ending with '.save' (for
DOS, the saved filename ends in '.sav' without the original '.c'
suffix). If the '.save' ('.sav' for DOS) file already exists, then the
source file is simply discarded.
'protoize' and 'unprotoize' both depend on GCC itself to scan the
program and collect information about the functions it uses. So neither
of these programs will work until GCC is installed.
Here is a table of the options you can use with 'protoize' and
'unprotoize'. Each option works with both programs unless otherwise
stated.
'-B DIRECTORY'
Look for the file 'SYSCALLS.c.X' in DIRECTORY, instead of the usual
directory (normally '/usr/local/lib'). This file contains
prototype information about standard system functions. This option
applies only to 'protoize'.
'-c COMPILATION-OPTIONS'
Use COMPILATION-OPTIONS as the options when running 'gcc' to
produce the '.X' files. The special option '-aux-info' is always
passed in addition, to tell 'gcc' to write a '.X' file.
Note that the compilation options must be given as a single
argument to 'protoize' or 'unprotoize'. If you want to specify
several 'gcc' options, you must quote the entire set of compilation
options to make them a single word in the shell.
There are certain 'gcc' arguments that you cannot use, because they
would produce the wrong kind of output. These include '-g', '-O',
'-c', '-S', and '-o' If you include these in the
COMPILATION-OPTIONS, they are ignored.
'-C'
Rename files to end in '.C' ('.cc' for DOS-based file systems)
instead of '.c'. This is convenient if you are converting a C
program to C++. This option applies only to 'protoize'.
'-g'
Add explicit global declarations. This means inserting explicit
declarations at the beginning of each source file for each function
that is called in the file and was not declared. These
declarations precede the first function definition that contains a
call to an undeclared function. This option applies only to
'protoize'.
'-i STRING'
Indent old-style parameter declarations with the string STRING.
This option applies only to 'protoize'.
'unprotoize' converts prototyped function definitions to old-style
function definitions, where the arguments are declared between the
argument list and the initial '{'. By default, 'unprotoize' uses
five spaces as the indentation. If you want to indent with just
one space instead, use '-i " "'.
'-k'
Keep the '.X' files. Normally, they are deleted after conversion
is finished.
'-l'
Add explicit local declarations. 'protoize' with '-l' inserts a
prototype declaration for each function in each block which calls
the function without any declaration. This option applies only to
'protoize'.
'-n'
Make no real changes. This mode just prints information about the
conversions that would have been done without '-n'.
'-N'
Make no '.save' files. The original files are simply deleted. Use
this option with caution.
'-p PROGRAM'
Use the program PROGRAM as the compiler. Normally, the name 'gcc'
is used.
'-q'
Work quietly. Most warnings are suppressed.
'-v'
Print the version number, just like '-v' for 'gcc'.
If you need special compiler options to compile one of your program's
source files, then you should generate that file's '.X' file specially,
by running 'gcc' on that source file with the appropriate options and
the option '-aux-info'. Then run 'protoize' on the entire set of files.
'protoize' will use the existing '.X' file because it is newer than the
source file. For example:
gcc -Dfoo=bar file1.c -aux-info file1.X
protoize *.c
You need to include the special files along with the rest in the
'protoize' command, even though their '.X' files already exist, because
otherwise they won't get converted.
*Note Protoize Caveats::, for more information on how to use 'protoize'
successfully.

File: gcc.info, Node: C Implementation, Next: C Extensions, Prev: Invoking GCC, Up: Top
4 C Implementation-defined behavior
***********************************
A conforming implementation of ISO C is required to document its choice
of behavior in each of the areas that are designated "implementation
defined". The following lists all such areas, along with the section
numbers from the ISO/IEC 9899:1990 and ISO/IEC 9899:1999 standards.
Some areas are only implementation-defined in one version of the
standard.
Some choices depend on the externally determined ABI for the platform
(including standard character encodings) which GCC follows; these are
listed as "determined by ABI" below. *Note Binary Compatibility:
Compatibility, and <http://gcc.gnu.org/readings.html>. Some choices are
documented in the preprocessor manual. *Note Implementation-defined
behavior: (cpp)Implementation-defined behavior. Some choices are made
by the library and operating system (or other environment when compiling
for a freestanding environment); refer to their documentation for
details.
* Menu:
* Translation implementation::
* Environment implementation::
* Identifiers implementation::
* Characters implementation::
* Integers implementation::
* Floating point implementation::
* Arrays and pointers implementation::
* Hints implementation::
* Structures unions enumerations and bit-fields implementation::
* Qualifiers implementation::
* Declarators implementation::
* Statements implementation::
* Preprocessing directives implementation::
* Library functions implementation::
* Architecture implementation::
* Locale-specific behavior implementation::

File: gcc.info, Node: Translation implementation, Next: Environment implementation, Up: C Implementation
4.1 Translation
===============
* 'How a diagnostic is identified (C90 3.7, C99 3.10, C90 and C99
5.1.1.3).'
Diagnostics consist of all the output sent to stderr by GCC.
* 'Whether each nonempty sequence of white-space characters other
than new-line is retained or replaced by one space character in
translation phase 3 (C90 and C99 5.1.1.2).'
*Note Implementation-defined behavior: (cpp)Implementation-defined
behavior.

File: gcc.info, Node: Environment implementation, Next: Identifiers implementation, Prev: Translation implementation, Up: C Implementation
4.2 Environment
===============
The behavior of most of these points are dependent on the implementation
of the C library, and are not defined by GCC itself.
* 'The mapping between physical source file multibyte characters and
the source character set in translation phase 1 (C90 and C99
5.1.1.2).'
*Note Implementation-defined behavior: (cpp)Implementation-defined
behavior.

File: gcc.info, Node: Identifiers implementation, Next: Characters implementation, Prev: Environment implementation, Up: C Implementation
4.3 Identifiers
===============
* 'Which additional multibyte characters may appear in identifiers
and their correspondence to universal character names (C99 6.4.2).'
*Note Implementation-defined behavior: (cpp)Implementation-defined
behavior.
* 'The number of significant initial characters in an identifier (C90
6.1.2, C90 and C99 5.2.4.1, C99 6.4.2).'
For internal names, all characters are significant. For external
names, the number of significant characters are defined by the
linker; for almost all targets, all characters are significant.
* 'Whether case distinctions are significant in an identifier with
external linkage (C90 6.1.2).'
This is a property of the linker. C99 requires that case
distinctions are always significant in identifiers with external
linkage and systems without this property are not supported by GCC.

File: gcc.info, Node: Characters implementation, Next: Integers implementation, Prev: Identifiers implementation, Up: C Implementation
4.4 Characters
==============
* 'The number of bits in a byte (C90 3.4, C99 3.6).'
Determined by ABI.
* 'The values of the members of the execution character set (C90 and
C99 5.2.1).'
Determined by ABI.
* 'The unique value of the member of the execution character set
produced for each of the standard alphabetic escape sequences (C90
and C99 5.2.2).'
Determined by ABI.
* 'The value of a 'char' object into which has been stored any
character other than a member of the basic execution character set
(C90 6.1.2.5, C99 6.2.5).'
Determined by ABI.
* 'Which of 'signed char' or 'unsigned char' has the same range,
representation, and behavior as "plain" 'char' (C90 6.1.2.5, C90
6.2.1.1, C99 6.2.5, C99 6.3.1.1).'
Determined by ABI. The options '-funsigned-char' and
'-fsigned-char' change the default. *Note Options Controlling C
Dialect: C Dialect Options.
* 'The mapping of members of the source character set (in character
constants and string literals) to members of the execution
character set (C90 6.1.3.4, C99 6.4.4.4, C90 and C99 5.1.1.2).'
Determined by ABI.
* 'The value of an integer character constant containing more than
one character or containing a character or escape sequence that
does not map to a single-byte execution character (C90 6.1.3.4, C99
6.4.4.4).'
*Note Implementation-defined behavior: (cpp)Implementation-defined
behavior.
* 'The value of a wide character constant containing more than one
multibyte character, or containing a multibyte character or escape
sequence not represented in the extended execution character set
(C90 6.1.3.4, C99 6.4.4.4).'
*Note Implementation-defined behavior: (cpp)Implementation-defined
behavior.
* 'The current locale used to convert a wide character constant
consisting of a single multibyte character that maps to a member of
the extended execution character set into a corresponding wide
character code (C90 6.1.3.4, C99 6.4.4.4).'
*Note Implementation-defined behavior: (cpp)Implementation-defined
behavior.
* 'The current locale used to convert a wide string literal into
corresponding wide character codes (C90 6.1.4, C99 6.4.5).'
*Note Implementation-defined behavior: (cpp)Implementation-defined
behavior.
* 'The value of a string literal containing a multibyte character or
escape sequence not represented in the execution character set (C90
6.1.4, C99 6.4.5).'
*Note Implementation-defined behavior: (cpp)Implementation-defined
behavior.

File: gcc.info, Node: Integers implementation, Next: Floating point implementation, Prev: Characters implementation, Up: C Implementation
4.5 Integers
============
* 'Any extended integer types that exist in the implementation (C99
6.2.5).'
GCC does not support any extended integer types.
* 'Whether signed integer types are represented using sign and
magnitude, two's complement, or one's complement, and whether the
extraordinary value is a trap representation or an ordinary value
(C99 6.2.6.2).'
GCC supports only two's complement integer types, and all bit
patterns are ordinary values.
* 'The rank of any extended integer type relative to another extended
integer type with the same precision (C99 6.3.1.1).'
GCC does not support any extended integer types.
* 'The result of, or the signal raised by, converting an integer to a
signed integer type when the value cannot be represented in an
object of that type (C90 6.2.1.2, C99 6.3.1.3).'
For conversion to a type of width N, the value is reduced modulo
2^N to be within range of the type; no signal is raised.
* 'The results of some bitwise operations on signed integers (C90
6.3, C99 6.5).'
Bitwise operators act on the representation of the value including
both the sign and value bits, where the sign bit is considered
immediately above the highest-value value bit. Signed '>>' acts on
negative numbers by sign extension.
GCC does not use the latitude given in C99 only to treat certain
aspects of signed '<<' as undefined, but this is subject to change.
* 'The sign of the remainder on integer division (C90 6.3.5).'
GCC always follows the C99 requirement that the result of division
is truncated towards zero.

File: gcc.info, Node: Floating point implementation, Next: Arrays and pointers implementation, Prev: Integers implementation, Up: C Implementation
4.6 Floating point
==================
* 'The accuracy of the floating-point operations and of the library
functions in '<math.h>' and '<complex.h>' that return
floating-point results (C90 and C99 5.2.4.2.2).'
The accuracy is unknown.
* 'The rounding behaviors characterized by non-standard values of
'FLT_ROUNDS' (C90 and C99 5.2.4.2.2).'
GCC does not use such values.
* 'The evaluation methods characterized by non-standard negative
values of 'FLT_EVAL_METHOD' (C99 5.2.4.2.2).'
GCC does not use such values.
* 'The direction of rounding when an integer is converted to a
floating-point number that cannot exactly represent the original
value (C90 6.2.1.3, C99 6.3.1.4).'
C99 Annex F is followed.
* 'The direction of rounding when a floating-point number is
converted to a narrower floating-point number (C90 6.2.1.4, C99
6.3.1.5).'
C99 Annex F is followed.
* 'How the nearest representable value or the larger or smaller
representable value immediately adjacent to the nearest
representable value is chosen for certain floating constants (C90
6.1.3.1, C99 6.4.4.2).'
C99 Annex F is followed.
* 'Whether and how floating expressions are contracted when not
disallowed by the 'FP_CONTRACT' pragma (C99 6.5).'
Expressions are currently only contracted if
'-funsafe-math-optimizations' or '-ffast-math' are used. This is
subject to change.
* 'The default state for the 'FENV_ACCESS' pragma (C99 7.6.1).'
This pragma is not implemented, but the default is to "off" unless
'-frounding-math' is used in which case it is "on".
* 'Additional floating-point exceptions, rounding modes,
environments, and classifications, and their macro names (C99 7.6,
C99 7.12).'
This is dependent on the implementation of the C library, and is
not defined by GCC itself.
* 'The default state for the 'FP_CONTRACT' pragma (C99 7.12.2).'
This pragma is not implemented. Expressions are currently only
contracted if '-funsafe-math-optimizations' or '-ffast-math' are
used. This is subject to change.
* 'Whether the "inexact" floating-point exception can be raised when
the rounded result actually does equal the mathematical result in
an IEC 60559 conformant implementation (C99 F.9).'
This is dependent on the implementation of the C library, and is
not defined by GCC itself.
* 'Whether the "underflow" (and "inexact") floating-point exception
can be raised when a result is tiny but not inexact in an IEC 60559
conformant implementation (C99 F.9).'
This is dependent on the implementation of the C library, and is
not defined by GCC itself.

File: gcc.info, Node: Arrays and pointers implementation, Next: Hints implementation, Prev: Floating point implementation, Up: C Implementation
4.7 Arrays and pointers
=======================
* 'The result of converting a pointer to an integer or vice versa
(C90 6.3.4, C99 6.3.2.3).'
A cast from pointer to integer discards most-significant bits if
the pointer representation is larger than the integer type,
sign-extends(1) if the pointer representation is smaller than the
integer type, otherwise the bits are unchanged.
A cast from integer to pointer discards most-significant bits if
the pointer representation is smaller than the integer type,
extends according to the signedness of the integer type if the
pointer representation is larger than the integer type, otherwise
the bits are unchanged.
When casting from pointer to integer and back again, the resulting
pointer must reference the same object as the original pointer,
otherwise the behavior is undefined. That is, one may not use
integer arithmetic to avoid the undefined behavior of pointer
arithmetic as proscribed in C99 6.5.6/8.
* 'The size of the result of subtracting two pointers to elements of
the same array (C90 6.3.6, C99 6.5.6).'
The value is as specified in the standard and the type is
determined by the ABI.
---------- Footnotes ----------
(1) Future versions of GCC may zero-extend, or use a target-defined
'ptr_extend' pattern. Do not rely on sign extension.

File: gcc.info, Node: Hints implementation, Next: Structures unions enumerations and bit-fields implementation, Prev: Arrays and pointers implementation, Up: C Implementation
4.8 Hints
=========
* 'The extent to which suggestions made by using the 'register'
storage-class specifier are effective (C90 6.5.1, C99 6.7.1).'
The 'register' specifier affects code generation only in these
ways:
* When used as part of the register variable extension, see
*note Explicit Reg Vars::.
* When '-O0' is in use, the compiler allocates distinct stack
memory for all variables that do not have the 'register'
storage-class specifier; if 'register' is specified, the
variable may have a shorter lifespan than the code would
indicate and may never be placed in memory.
* On some rare x86 targets, 'setjmp' doesn't save the registers
in all circumstances. In those cases, GCC doesn't allocate
any variables in registers unless they are marked 'register'.
* 'The extent to which suggestions made by using the inline function
specifier are effective (C99 6.7.4).'
GCC will not inline any functions if the '-fno-inline' option is
used or if '-O0' is used. Otherwise, GCC may still be unable to
inline a function for many reasons; the '-Winline' option may be
used to determine if a function has not been inlined and why not.

File: gcc.info, Node: Structures unions enumerations and bit-fields implementation, Next: Qualifiers implementation, Prev: Hints implementation, Up: C Implementation
4.9 Structures, unions, enumerations, and bit-fields
====================================================
* 'A member of a union object is accessed using a member of a
different type (C90 6.3.2.3).'
The relevant bytes of the representation of the object are treated
as an object of the type used for the access. *Note
Type-punning::. This may be a trap representation.
* 'Whether a "plain" 'int' bit-field is treated as a 'signed int'
bit-field or as an 'unsigned int' bit-field (C90 6.5.2, C90
6.5.2.1, C99 6.7.2, C99 6.7.2.1).'
By default it is treated as 'signed int' but this may be changed by
the '-funsigned-bitfields' option.
* 'Allowable bit-field types other than '_Bool', 'signed int', and
'unsigned int' (C99 6.7.2.1).'
No other types are permitted in strictly conforming mode.
* 'Whether a bit-field can straddle a storage-unit boundary (C90
6.5.2.1, C99 6.7.2.1).'
Determined by ABI.
* 'The order of allocation of bit-fields within a unit (C90 6.5.2.1,
C99 6.7.2.1).'
Determined by ABI.
* 'The alignment of non-bit-field members of structures (C90 6.5.2.1,
C99 6.7.2.1).'
Determined by ABI.
* 'The integer type compatible with each enumerated type (C90
6.5.2.2, C99 6.7.2.2).'
Normally, the type is 'unsigned int' if there are no negative
values in the enumeration, otherwise 'int'. If '-fshort-enums' is
specified, then if there are negative values it is the first of
'signed char', 'short' and 'int' that can represent all the values,
otherwise it is the first of 'unsigned char', 'unsigned short' and
'unsigned int' that can represent all the values.
On some targets, '-fshort-enums' is the default; this is determined
by the ABI.

File: gcc.info, Node: Qualifiers implementation, Next: Declarators implementation, Prev: Structures unions enumerations and bit-fields implementation, Up: C Implementation
4.10 Qualifiers
===============
* 'What constitutes an access to an object that has
volatile-qualified type (C90 6.5.3, C99 6.7.3).'
Such an object is normally accessed by pointers and used for
accessing hardware. In most expressions, it is intuitively obvious
what is a read and what is a write. For example
volatile int *dst = SOMEVALUE;
volatile int *src = SOMEOTHERVALUE;
*dst = *src;
will cause a read of the volatile object pointed to by SRC and
store the value into the volatile object pointed to by DST. There
is no guarantee that these reads and writes are atomic, especially
for objects larger than 'int'.
However, if the volatile storage is not being modified, and the
value of the volatile storage is not used, then the situation is
less obvious. For example
volatile int *src = SOMEVALUE;
*src;
According to the C standard, such an expression is an rvalue whose
type is the unqualified version of its original type, i.e. 'int'.
Whether GCC interprets this as a read of the volatile object being
pointed to or only as a request to evaluate the expression for its
side-effects depends on this type.
If it is a scalar type, or on most targets an aggregate type whose
only member object is of a scalar type, or a union type whose
member objects are of scalar types, the expression is interpreted
by GCC as a read of the volatile object; in the other cases, the
expression is only evaluated for its side-effects.

File: gcc.info, Node: Declarators implementation, Next: Statements implementation, Prev: Qualifiers implementation, Up: C Implementation
4.11 Declarators
================
* 'The maximum number of declarators that may modify an arithmetic,
structure or union type (C90 6.5.4).'
GCC is only limited by available memory.

File: gcc.info, Node: Statements implementation, Next: Preprocessing directives implementation, Prev: Declarators implementation, Up: C Implementation
4.12 Statements
===============
* 'The maximum number of 'case' values in a 'switch' statement (C90
6.6.4.2).'
GCC is only limited by available memory.

File: gcc.info, Node: Preprocessing directives implementation, Next: Library functions implementation, Prev: Statements implementation, Up: C Implementation
4.13 Preprocessing directives
=============================
*Note Implementation-defined behavior: (cpp)Implementation-defined
behavior, for details of these aspects of implementation-defined
behavior.
* 'How sequences in both forms of header names are mapped to headers
or external source file names (C90 6.1.7, C99 6.4.7).'
* 'Whether the value of a character constant in a constant expression
that controls conditional inclusion matches the value of the same
character constant in the execution character set (C90 6.8.1, C99
6.10.1).'
* 'Whether the value of a single-character character constant in a
constant expression that controls conditional inclusion may have a
negative value (C90 6.8.1, C99 6.10.1).'
* 'The places that are searched for an included '<>' delimited
header, and how the places are specified or the header is
identified (C90 6.8.2, C99 6.10.2).'
* 'How the named source file is searched for in an included '""'
delimited header (C90 6.8.2, C99 6.10.2).'
* 'The method by which preprocessing tokens (possibly resulting from
macro expansion) in a '#include' directive are combined into a
header name (C90 6.8.2, C99 6.10.2).'
* 'The nesting limit for '#include' processing (C90 6.8.2, C99
6.10.2).'
* 'Whether the '#' operator inserts a '\' character before the '\'
character that begins a universal character name in a character
constant or string literal (C99 6.10.3.2).'
* 'The behavior on each recognized non-'STDC #pragma' directive (C90
6.8.6, C99 6.10.6).'
*Note Pragmas: (cpp)Pragmas, for details of pragmas accepted by GCC
on all targets. *Note Pragmas Accepted by GCC: Pragmas, for
details of target-specific pragmas.
* 'The definitions for '__DATE__' and '__TIME__' when respectively,
the date and time of translation are not available (C90 6.8.8, C99
6.10.8).'

File: gcc.info, Node: Library functions implementation, Next: Architecture implementation, Prev: Preprocessing directives implementation, Up: C Implementation
4.14 Library functions
======================
The behavior of most of these points are dependent on the implementation
of the C library, and are not defined by GCC itself.
* 'The null pointer constant to which the macro 'NULL' expands (C90
7.1.6, C99 7.17).'
In '<stddef.h>', 'NULL' expands to '((void *)0)'. GCC does not
provide the other headers which define 'NULL' and some library
implementations may use other definitions in those headers.

File: gcc.info, Node: Architecture implementation, Next: Locale-specific behavior implementation, Prev: Library functions implementation, Up: C Implementation
4.15 Architecture
=================
* 'The values or expressions assigned to the macros specified in the
headers '<float.h>', '<limits.h>', and '<stdint.h>' (C90 and C99
5.2.4.2, C99 7.18.2, C99 7.18.3).'
Determined by ABI.
* 'The number, order, and encoding of bytes in any object (when not
explicitly specified in this International Standard) (C99
6.2.6.1).'
Determined by ABI.
* 'The value of the result of the 'sizeof' operator (C90 6.3.3.4, C99
6.5.3.4).'
Determined by ABI.

File: gcc.info, Node: Locale-specific behavior implementation, Prev: Architecture implementation, Up: C Implementation
4.16 Locale-specific behavior
=============================
The behavior of these points are dependent on the implementation of the
C library, and are not defined by GCC itself.

File: gcc.info, Node: C Extensions, Next: C++ Extensions, Prev: C Implementation, Up: Top
5 Extensions to the C Language Family
*************************************
GNU C provides several language features not found in ISO standard C.
(The '-pedantic' option directs GCC to print a warning message if any of
these features is used.) To test for the availability of these features
in conditional compilation, check for a predefined macro '__GNUC__',
which is always defined under GCC.
These extensions are available in C and Objective-C. Most of them are
also available in C++. *Note Extensions to the C++ Language: C++
Extensions, for extensions that apply _only_ to C++.
Some features that are in ISO C99 but not C89 or C++ are also, as
extensions, accepted by GCC in C89 mode and in C++.
* Menu:
* Statement Exprs:: Putting statements and declarations inside expressions.
* Local Labels:: Labels local to a block.
* Labels as Values:: Getting pointers to labels, and computed gotos.
* Nested Functions:: As in Algol and Pascal, lexical scoping of functions.
* Constructing Calls:: Dispatching a call to another function.
* Typeof:: 'typeof': referring to the type of an expression.
* Conditionals:: Omitting the middle operand of a '?:' expression.
* Long Long:: Double-word integers--'long long int'.
* Complex:: Data types for complex numbers.
* Floating Types:: Additional Floating Types.
* Decimal Float:: Decimal Floating Types.
* Hex Floats:: Hexadecimal floating-point constants.
* Fixed-Point:: Fixed-Point Types.
* Zero Length:: Zero-length arrays.
* Variable Length:: Arrays whose length is computed at run time.
* Empty Structures:: Structures with no members.
* Variadic Macros:: Macros with a variable number of arguments.
* Escaped Newlines:: Slightly looser rules for escaped newlines.
* Subscripting:: Any array can be subscripted, even if not an lvalue.
* Pointer Arith:: Arithmetic on 'void'-pointers and function pointers.
* Initializers:: Non-constant initializers.
* Compound Literals:: Compound literals give structures, unions
or arrays as values.
* Designated Inits:: Labeling elements of initializers.
* Cast to Union:: Casting to union type from any member of the union.
* Case Ranges:: 'case 1 ... 9' and such.
* Mixed Declarations:: Mixing declarations and code.
* Function Attributes:: Declaring that functions have no side effects,
or that they can never return.
* Attribute Syntax:: Formal syntax for attributes.
* Function Prototypes:: Prototype declarations and old-style definitions.
* C++ Comments:: C++ comments are recognized.
* Dollar Signs:: Dollar sign is allowed in identifiers.
* Character Escapes:: '\e' stands for the character <ESC>.
* Variable Attributes:: Specifying attributes of variables.
* Type Attributes:: Specifying attributes of types.
* Alignment:: Inquiring about the alignment of a type or variable.
* Inline:: Defining inline functions (as fast as macros).
* Extended Asm:: Assembler instructions with C expressions as operands.
(With them you can define "built-in" functions.)
* Constraints:: Constraints for asm operands
* Asm Labels:: Specifying the assembler name to use for a C symbol.
* Explicit Reg Vars:: Defining variables residing in specified registers.
* Alternate Keywords:: '__const__', '__asm__', etc., for header files.
* Incomplete Enums:: 'enum foo;', with details to follow.
* Function Names:: Printable strings which are the name of the current
function.
* Return Address:: Getting the return or frame address of a function.
* Vector Extensions:: Using vector instructions through built-in functions.
* Offsetof:: Special syntax for implementing 'offsetof'.
* Atomic Builtins:: Built-in functions for atomic memory access.
* Object Size Checking:: Built-in functions for limited buffer overflow
checking.
* Other Builtins:: Other built-in functions.
* Target Builtins:: Built-in functions specific to particular targets.
* Target Format Checks:: Format checks specific to particular targets.
* Pragmas:: Pragmas accepted by GCC.
* Unnamed Fields:: Unnamed struct/union fields within structs/unions.
* Thread-Local:: Per-thread variables.
* Binary constants:: Binary constants using the '0b' prefix.

File: gcc.info, Node: Statement Exprs, Next: Local Labels, Up: C Extensions
5.1 Statements and Declarations in Expressions
==============================================
A compound statement enclosed in parentheses may appear as an expression
in GNU C. This allows you to use loops, switches, and local variables
within an expression.
Recall that a compound statement is a sequence of statements surrounded
by braces; in this construct, parentheses go around the braces. For
example:
({ int y = foo (); int z;
if (y > 0) z = y;
else z = - y;
z; })
is a valid (though slightly more complex than necessary) expression for
the absolute value of 'foo ()'.
The last thing in the compound statement should be an expression
followed by a semicolon; the value of this subexpression serves as the
value of the entire construct. (If you use some other kind of statement
last within the braces, the construct has type 'void', and thus
effectively no value.)
This feature is especially useful in making macro definitions "safe"
(so that they evaluate each operand exactly once). For example, the
"maximum" function is commonly defined as a macro in standard C as
follows:
#define max(a,b) ((a) > (b) ? (a) : (b))
But this definition computes either A or B twice, with bad results if
the operand has side effects. In GNU C, if you know the type of the
operands (here taken as 'int'), you can define the macro safely as
follows:
#define maxint(a,b) \
({int _a = (a), _b = (b); _a > _b ? _a : _b; })
Embedded statements are not allowed in constant expressions, such as
the value of an enumeration constant, the width of a bit-field, or the
initial value of a static variable.
If you don't know the type of the operand, you can still do this, but
you must use 'typeof' (*note Typeof::).
In G++, the result value of a statement expression undergoes array and
function pointer decay, and is returned by value to the enclosing
expression. For instance, if 'A' is a class, then
A a;
({a;}).Foo ()
will construct a temporary 'A' object to hold the result of the
statement expression, and that will be used to invoke 'Foo'. Therefore
the 'this' pointer observed by 'Foo' will not be the address of 'a'.
Any temporaries created within a statement within a statement
expression will be destroyed at the statement's end. This makes
statement expressions inside macros slightly different from function
calls. In the latter case temporaries introduced during argument
evaluation will be destroyed at the end of the statement that includes
the function call. In the statement expression case they will be
destroyed during the statement expression. For instance,
#define macro(a) ({__typeof__(a) b = (a); b + 3; })
template<typename T> T function(T a) { T b = a; return b + 3; }
void foo ()
{
macro (X ());
function (X ());
}
will have different places where temporaries are destroyed. For the
'macro' case, the temporary 'X' will be destroyed just after the
initialization of 'b'. In the 'function' case that temporary will be
destroyed when the function returns.
These considerations mean that it is probably a bad idea to use
statement-expressions of this form in header files that are designed to
work with C++. (Note that some versions of the GNU C Library contained
header files using statement-expression that lead to precisely this
bug.)
Jumping into a statement expression with 'goto' or using a 'switch'
statement outside the statement expression with a 'case' or 'default'
label inside the statement expression is not permitted. Jumping into a
statement expression with a computed 'goto' (*note Labels as Values::)
yields undefined behavior. Jumping out of a statement expression is
permitted, but if the statement expression is part of a larger
expression then it is unspecified which other subexpressions of that
expression have been evaluated except where the language definition
requires certain subexpressions to be evaluated before or after the
statement expression. In any case, as with a function call the
evaluation of a statement expression is not interleaved with the
evaluation of other parts of the containing expression. For example,
foo (), (({ bar1 (); goto a; 0; }) + bar2 ()), baz();
will call 'foo' and 'bar1' and will not call 'baz' but may or may not
call 'bar2'. If 'bar2' is called, it will be called after 'foo' and
before 'bar1'

File: gcc.info, Node: Local Labels, Next: Labels as Values, Prev: Statement Exprs, Up: C Extensions
5.2 Locally Declared Labels
===========================
GCC allows you to declare "local labels" in any nested block scope. A
local label is just like an ordinary label, but you can only reference
it (with a 'goto' statement, or by taking its address) within the block
in which it was declared.
A local label declaration looks like this:
__label__ LABEL;
or
__label__ LABEL1, LABEL2, /* ... */;
Local label declarations must come at the beginning of the block,
before any ordinary declarations or statements.
The label declaration defines the label _name_, but does not define the
label itself. You must do this in the usual way, with 'LABEL:', within
the statements of the statement expression.
The local label feature is useful for complex macros. If a macro
contains nested loops, a 'goto' can be useful for breaking out of them.
However, an ordinary label whose scope is the whole function cannot be
used: if the macro can be expanded several times in one function, the
label will be multiply defined in that function. A local label avoids
this problem. For example:
#define SEARCH(value, array, target) \
do { \
__label__ found; \
typeof (target) _SEARCH_target = (target); \
typeof (*(array)) *_SEARCH_array = (array); \
int i, j; \
int value; \
for (i = 0; i < max; i++) \
for (j = 0; j < max; j++) \
if (_SEARCH_array[i][j] == _SEARCH_target) \
{ (value) = i; goto found; } \
(value) = -1; \
found:; \
} while (0)
This could also be written using a statement-expression:
#define SEARCH(array, target) \
({ \
__label__ found; \
typeof (target) _SEARCH_target = (target); \
typeof (*(array)) *_SEARCH_array = (array); \
int i, j; \
int value; \
for (i = 0; i < max; i++) \
for (j = 0; j < max; j++) \
if (_SEARCH_array[i][j] == _SEARCH_target) \
{ value = i; goto found; } \
value = -1; \
found: \
value; \
})
Local label declarations also make the labels they declare visible to
nested functions, if there are any. *Note Nested Functions::, for
details.

File: gcc.info, Node: Labels as Values, Next: Nested Functions, Prev: Local Labels, Up: C Extensions
5.3 Labels as Values
====================
You can get the address of a label defined in the current function (or a
containing function) with the unary operator '&&'. The value has type
'void *'. This value is a constant and can be used wherever a constant
of that type is valid. For example:
void *ptr;
/* ... */
ptr = &&foo;
To use these values, you need to be able to jump to one. This is done
with the computed goto statement(1), 'goto *EXP;'. For example,
goto *ptr;
Any expression of type 'void *' is allowed.
One way of using these constants is in initializing a static array that
will serve as a jump table:
static void *array[] = { &&foo, &&bar, &&hack };
Then you can select a label with indexing, like this:
goto *array[i];
Note that this does not check whether the subscript is in bounds--array
indexing in C never does that.
Such an array of label values serves a purpose much like that of the
'switch' statement. The 'switch' statement is cleaner, so use that
rather than an array unless the problem does not fit a 'switch'
statement very well.
Another use of label values is in an interpreter for threaded code.
The labels within the interpreter function can be stored in the threaded
code for super-fast dispatching.
You may not use this mechanism to jump to code in a different function.
If you do that, totally unpredictable things will happen. The best way
to avoid this is to store the label address only in automatic variables
and never pass it as an argument.
An alternate way to write the above example is
static const int array[] = { &&foo - &&foo, &&bar - &&foo,
&&hack - &&foo };
goto *(&&foo + array[i]);
This is more friendly to code living in shared libraries, as it reduces
the number of dynamic relocations that are needed, and by consequence,
allows the data to be read-only.
The '&&foo' expressions for the same label might have different values
if the containing function is inlined or cloned. If a program relies on
them being always the same, '__attribute__((__noinline__))' should be
used to prevent inlining. If '&&foo' is used in a static variable
initializer, inlining is forbidden.
---------- Footnotes ----------
(1) The analogous feature in Fortran is called an assigned goto, but
that name seems inappropriate in C, where one can do more than simply
store label addresses in label variables.

File: gcc.info, Node: Nested Functions, Next: Constructing Calls, Prev: Labels as Values, Up: C Extensions
5.4 Nested Functions
====================
A "nested function" is a function defined inside another function.
(Nested functions are not supported for GNU C++.) The nested function's
name is local to the block where it is defined. For example, here we
define a nested function named 'square', and call it twice:
foo (double a, double b)
{
double square (double z) { return z * z; }
return square (a) + square (b);
}
The nested function can access all the variables of the containing
function that are visible at the point of its definition. This is
called "lexical scoping". For example, here we show a nested function
which uses an inherited variable named 'offset':
bar (int *array, int offset, int size)
{
int access (int *array, int index)
{ return array[index + offset]; }
int i;
/* ... */
for (i = 0; i < size; i++)
/* ... */ access (array, i) /* ... */
}
Nested function definitions are permitted within functions in the
places where variable definitions are allowed; that is, in any block,
mixed with the other declarations and statements in the block.
It is possible to call the nested function from outside the scope of
its name by storing its address or passing the address to another
function:
hack (int *array, int size)
{
void store (int index, int value)
{ array[index] = value; }
intermediate (store, size);
}
Here, the function 'intermediate' receives the address of 'store' as an
argument. If 'intermediate' calls 'store', the arguments given to
'store' are used to store into 'array'. But this technique works only
so long as the containing function ('hack', in this example) does not
exit.
If you try to call the nested function through its address after the
containing function has exited, all hell will break loose. If you try
to call it after a containing scope level has exited, and if it refers
to some of the variables that are no longer in scope, you may be lucky,
but it's not wise to take the risk. If, however, the nested function
does not refer to anything that has gone out of scope, you should be
safe.
GCC implements taking the address of a nested function using a
technique called "trampolines". A paper describing them is available as
<http://people.debian.org/~aaronl/Usenix88-lexic.pdf>.
A nested function can jump to a label inherited from a containing
function, provided the label was explicitly declared in the containing
function (*note Local Labels::). Such a jump returns instantly to the
containing function, exiting the nested function which did the 'goto'
and any intermediate functions as well. Here is an example:
bar (int *array, int offset, int size)
{
__label__ failure;
int access (int *array, int index)
{
if (index > size)
goto failure;
return array[index + offset];
}
int i;
/* ... */
for (i = 0; i < size; i++)
/* ... */ access (array, i) /* ... */
/* ... */
return 0;
/* Control comes here from 'access'
if it detects an error. */
failure:
return -1;
}
A nested function always has no linkage. Declaring one with 'extern'
or 'static' is erroneous. If you need to declare the nested function
before its definition, use 'auto' (which is otherwise meaningless for
function declarations).
bar (int *array, int offset, int size)
{
__label__ failure;
auto int access (int *, int);
/* ... */
int access (int *array, int index)
{
if (index > size)
goto failure;
return array[index + offset];
}
/* ... */
}

File: gcc.info, Node: Constructing Calls, Next: Typeof, Prev: Nested Functions, Up: C Extensions
5.5 Constructing Function Calls
===============================
Using the built-in functions described below, you can record the
arguments a function received, and call another function with the same
arguments, without knowing the number or types of the arguments.
You can also record the return value of that function call, and later
return that value, without knowing what data type the function tried to
return (as long as your caller expects that data type).
However, these built-in functions may interact badly with some
sophisticated features or other extensions of the language. It is,
therefore, not recommended to use them outside very simple functions
acting as mere forwarders for their arguments.
-- Built-in Function: void * __builtin_apply_args ()
This built-in function returns a pointer to data describing how to
perform a call with the same arguments as were passed to the
current function.
The function saves the arg pointer register, structure value
address, and all registers that might be used to pass arguments to
a function into a block of memory allocated on the stack. Then it
returns the address of that block.
-- Built-in Function: void * __builtin_apply (void (*FUNCTION)(), void
*ARGUMENTS, size_t SIZE)
This built-in function invokes FUNCTION with a copy of the
parameters described by ARGUMENTS and SIZE.
The value of ARGUMENTS should be the value returned by
'__builtin_apply_args'. The argument SIZE specifies the size of
the stack argument data, in bytes.
This function returns a pointer to data describing how to return
whatever value was returned by FUNCTION. The data is saved in a
block of memory allocated on the stack.
It is not always simple to compute the proper value for SIZE. The
value is used by '__builtin_apply' to compute the amount of data
that should be pushed on the stack and copied from the incoming
argument area.
-- Built-in Function: void __builtin_return (void *RESULT)
This built-in function returns the value described by RESULT from
the containing function. You should specify, for RESULT, a value
returned by '__builtin_apply'.
-- Built-in Function: __builtin_va_arg_pack ()
This built-in function represents all anonymous arguments of an
inline function. It can be used only in inline functions which
will be always inlined, never compiled as a separate function, such
as those using '__attribute__ ((__always_inline__))' or
'__attribute__ ((__gnu_inline__))' extern inline functions. It
must be only passed as last argument to some other function with
variable arguments. This is useful for writing small wrapper
inlines for variable argument functions, when using preprocessor
macros is undesirable. For example:
extern int myprintf (FILE *f, const char *format, ...);
extern inline __attribute__ ((__gnu_inline__)) int
myprintf (FILE *f, const char *format, ...)
{
int r = fprintf (f, "myprintf: ");
if (r < 0)
return r;
int s = fprintf (f, format, __builtin_va_arg_pack ());
if (s < 0)
return s;
return r + s;
}
-- Built-in Function: __builtin_va_arg_pack_len ()
This built-in function returns the number of anonymous arguments of
an inline function. It can be used only in inline functions which
will be always inlined, never compiled as a separate function, such
as those using '__attribute__ ((__always_inline__))' or
'__attribute__ ((__gnu_inline__))' extern inline functions. For
example following will do link or runtime checking of open
arguments for optimized code:
#ifdef __OPTIMIZE__
extern inline __attribute__((__gnu_inline__)) int
myopen (const char *path, int oflag, ...)
{
if (__builtin_va_arg_pack_len () > 1)
warn_open_too_many_arguments ();
if (__builtin_constant_p (oflag))
{
if ((oflag & O_CREAT) != 0 && __builtin_va_arg_pack_len () < 1)
{
warn_open_missing_mode ();
return __open_2 (path, oflag);
}
return open (path, oflag, __builtin_va_arg_pack ());
}
if (__builtin_va_arg_pack_len () < 1)
return __open_2 (path, oflag);
return open (path, oflag, __builtin_va_arg_pack ());
}
#endif

File: gcc.info, Node: Typeof, Next: Conditionals, Prev: Constructing Calls, Up: C Extensions
5.6 Referring to a Type with 'typeof'
=====================================
Another way to refer to the type of an expression is with 'typeof'. The
syntax of using of this keyword looks like 'sizeof', but the construct
acts semantically like a type name defined with 'typedef'.
There are two ways of writing the argument to 'typeof': with an
expression or with a type. Here is an example with an expression:
typeof (x[0](1))
This assumes that 'x' is an array of pointers to functions; the type
described is that of the values of the functions.
Here is an example with a typename as the argument:
typeof (int *)
Here the type described is that of pointers to 'int'.
If you are writing a header file that must work when included in ISO C
programs, write '__typeof__' instead of 'typeof'. *Note Alternate
Keywords::.
A 'typeof'-construct can be used anywhere a typedef name could be used.
For example, you can use it in a declaration, in a cast, or inside of
'sizeof' or 'typeof'.
'typeof' is often useful in conjunction with the
statements-within-expressions feature. Here is how the two together can
be used to define a safe "maximum" macro that operates on any arithmetic
type and evaluates each of its arguments exactly once:
#define max(a,b) \
({ typeof (a) _a = (a); \
typeof (b) _b = (b); \
_a > _b ? _a : _b; })
The reason for using names that start with underscores for the local
variables is to avoid conflicts with variable names that occur within
the expressions that are substituted for 'a' and 'b'. Eventually we
hope to design a new form of declaration syntax that allows you to
declare variables whose scopes start only after their initializers; this
will be a more reliable way to prevent such conflicts.
Some more examples of the use of 'typeof':
* This declares 'y' with the type of what 'x' points to.
typeof (*x) y;
* This declares 'y' as an array of such values.
typeof (*x) y[4];
* This declares 'y' as an array of pointers to characters:
typeof (typeof (char *)[4]) y;
It is equivalent to the following traditional C declaration:
char *y[4];
To see the meaning of the declaration using 'typeof', and why it
might be a useful way to write, rewrite it with these macros:
#define pointer(T) typeof(T *)
#define array(T, N) typeof(T [N])
Now the declaration can be rewritten this way:
array (pointer (char), 4) y;
Thus, 'array (pointer (char), 4)' is the type of arrays of 4
pointers to 'char'.
_Compatibility Note:_ In addition to 'typeof', GCC 2 supported a more
limited extension which permitted one to write
typedef T = EXPR;
with the effect of declaring T to have the type of the expression EXPR.
This extension does not work with GCC 3 (versions between 3.0 and 3.2
will crash; 3.2.1 and later give an error). Code which relies on it
should be rewritten to use 'typeof':
typedef typeof(EXPR) T;
This will work with all versions of GCC.

File: gcc.info, Node: Conditionals, Next: Long Long, Prev: Typeof, Up: C Extensions
5.7 Conditionals with Omitted Operands
======================================
The middle operand in a conditional expression may be omitted. Then if
the first operand is nonzero, its value is the value of the conditional
expression.
Therefore, the expression
x ? : y
has the value of 'x' if that is nonzero; otherwise, the value of 'y'.
This example is perfectly equivalent to
x ? x : y
In this simple case, the ability to omit the middle operand is not
especially useful. When it becomes useful is when the first operand
does, or may (if it is a macro argument), contain a side effect. Then
repeating the operand in the middle would perform the side effect twice.
Omitting the middle operand uses the value already computed without the
undesirable effects of recomputing it.

File: gcc.info, Node: Long Long, Next: Complex, Prev: Conditionals, Up: C Extensions
5.8 Double-Word Integers
========================
ISO C99 supports data types for integers that are at least 64 bits wide,
and as an extension GCC supports them in C89 mode and in C++. Simply
write 'long long int' for a signed integer, or 'unsigned long long int'
for an unsigned integer. To make an integer constant of type 'long long
int', add the suffix 'LL' to the integer. To make an integer constant
of type 'unsigned long long int', add the suffix 'ULL' to the integer.
You can use these types in arithmetic like any other integer types.
Addition, subtraction, and bitwise boolean operations on these types are
open-coded on all types of machines. Multiplication is open-coded if
the machine supports fullword-to-doubleword a widening multiply
instruction. Division and shifts are open-coded only on machines that
provide special support. The operations that are not open-coded use
special library routines that come with GCC.
There may be pitfalls when you use 'long long' types for function
arguments, unless you declare function prototypes. If a function
expects type 'int' for its argument, and you pass a value of type 'long
long int', confusion will result because the caller and the subroutine
will disagree about the number of bytes for the argument. Likewise, if
the function expects 'long long int' and you pass 'int'. The best way
to avoid such problems is to use prototypes.

File: gcc.info, Node: Complex, Next: Floating Types, Prev: Long Long, Up: C Extensions
5.9 Complex Numbers
===================
ISO C99 supports complex floating data types, and as an extension GCC
supports them in C89 mode and in C++, and supports complex integer data
types which are not part of ISO C99. You can declare complex types
using the keyword '_Complex'. As an extension, the older GNU keyword
'__complex__' is also supported.
For example, '_Complex double x;' declares 'x' as a variable whose real
part and imaginary part are both of type 'double'. '_Complex short int
y;' declares 'y' to have real and imaginary parts of type 'short int';
this is not likely to be useful, but it shows that the set of complex
types is complete.
To write a constant with a complex data type, use the suffix 'i' or 'j'
(either one; they are equivalent). For example, '2.5fi' has type
'_Complex float' and '3i' has type '_Complex int'. Such a constant
always has a pure imaginary value, but you can form any complex value
you like by adding one to a real constant. This is a GNU extension; if
you have an ISO C99 conforming C library (such as GNU libc), and want to
construct complex constants of floating type, you should include
'<complex.h>' and use the macros 'I' or '_Complex_I' instead.
To extract the real part of a complex-valued expression EXP, write
'__real__ EXP'. Likewise, use '__imag__' to extract the imaginary part.
This is a GNU extension; for values of floating type, you should use the
ISO C99 functions 'crealf', 'creal', 'creall', 'cimagf', 'cimag' and
'cimagl', declared in '<complex.h>' and also provided as built-in
functions by GCC.
The operator '~' performs complex conjugation when used on a value with
a complex type. This is a GNU extension; for values of floating type,
you should use the ISO C99 functions 'conjf', 'conj' and 'conjl',
declared in '<complex.h>' and also provided as built-in functions by
GCC.
GCC can allocate complex automatic variables in a noncontiguous
fashion; it's even possible for the real part to be in a register while
the imaginary part is on the stack (or vice-versa). Only the DWARF2
debug info format can represent this, so use of DWARF2 is recommended.
If you are using the stabs debug info format, GCC describes a
noncontiguous complex variable as if it were two separate variables of
noncomplex type. If the variable's actual name is 'foo', the two
fictitious variables are named 'foo$real' and 'foo$imag'. You can
examine and set these two fictitious variables with your debugger.

File: gcc.info, Node: Floating Types, Next: Decimal Float, Prev: Complex, Up: C Extensions
5.10 Additional Floating Types
==============================
As an extension, the GNU C compiler supports additional floating types,
'__float80' and '__float128' to support 80bit ('XFmode') and 128 bit
('TFmode') floating types. Support for additional types includes the
arithmetic operators: add, subtract, multiply, divide; unary arithmetic
operators; relational operators; equality operators; and conversions to
and from integer and other floating types. Use a suffix 'w' or 'W' in a
literal constant of type '__float80' and 'q' or 'Q' for '_float128'.
You can declare complex types using the corresponding internal complex
type, 'XCmode' for '__float80' type and 'TCmode' for '__float128' type:
typedef _Complex float __attribute__((mode(TC))) _Complex128;
typedef _Complex float __attribute__((mode(XC))) _Complex80;
Not all targets support additional floating point types. '__float80'
is supported on i386, x86_64 and ia64 targets and target '__float128' is
supported on x86_64 and ia64 targets.

File: gcc.info, Node: Decimal Float, Next: Hex Floats, Prev: Floating Types, Up: C Extensions
5.11 Decimal Floating Types
===========================
As an extension, the GNU C compiler supports decimal floating types as
defined in the N1176 draft of ISO/IEC WDTR24732. Support for decimal
floating types in GCC will evolve as the draft technical report changes.
Calling conventions for any target might also change. Not all targets
support decimal floating types.
The decimal floating types are '_Decimal32', '_Decimal64', and
'_Decimal128'. They use a radix of ten, unlike the floating types
'float', 'double', and 'long double' whose radix is not specified by the
C standard but is usually two.
Support for decimal floating types includes the arithmetic operators
add, subtract, multiply, divide; unary arithmetic operators; relational
operators; equality operators; and conversions to and from integer and
other floating types. Use a suffix 'df' or 'DF' in a literal constant
of type '_Decimal32', 'dd' or 'DD' for '_Decimal64', and 'dl' or 'DL'
for '_Decimal128'.
GCC support of decimal float as specified by the draft technical report
is incomplete:
* Translation time data type (TTDT) is not supported.
* When the value of a decimal floating type cannot be represented in
the integer type to which it is being converted, the result is
undefined rather than the result value specified by the draft
technical report.
Types '_Decimal32', '_Decimal64', and '_Decimal128' are supported by
the DWARF2 debug information format.

File: gcc.info, Node: Hex Floats, Next: Fixed-Point, Prev: Decimal Float, Up: C Extensions
5.12 Hex Floats
===============
ISO C99 supports floating-point numbers written not only in the usual
decimal notation, such as '1.55e1', but also numbers such as '0x1.fp3'
written in hexadecimal format. As a GNU extension, GCC supports this in
C89 mode (except in some cases when strictly conforming) and in C++. In
that format the '0x' hex introducer and the 'p' or 'P' exponent field
are mandatory. The exponent is a decimal number that indicates the
power of 2 by which the significant part will be multiplied. Thus
'0x1.f' is 1 15/16, 'p3' multiplies it by 8, and the value of '0x1.fp3'
is the same as '1.55e1'.
Unlike for floating-point numbers in the decimal notation the exponent
is always required in the hexadecimal notation. Otherwise the compiler
would not be able to resolve the ambiguity of, e.g., '0x1.f'. This
could mean '1.0f' or '1.9375' since 'f' is also the extension for
floating-point constants of type 'float'.

File: gcc.info, Node: Fixed-Point, Next: Zero Length, Prev: Hex Floats, Up: C Extensions
5.13 Fixed-Point Types
======================
As an extension, the GNU C compiler supports fixed-point types as
defined in the N1169 draft of ISO/IEC DTR 18037. Support for
fixed-point types in GCC will evolve as the draft technical report
changes. Calling conventions for any target might also change. Not all
targets support fixed-point types.
The fixed-point types are 'short _Fract', '_Fract', 'long _Fract',
'long long _Fract', 'unsigned short _Fract', 'unsigned _Fract',
'unsigned long _Fract', 'unsigned long long _Fract', '_Sat short
_Fract', '_Sat _Fract', '_Sat long _Fract', '_Sat long long _Fract',
'_Sat unsigned short _Fract', '_Sat unsigned _Fract', '_Sat unsigned
long _Fract', '_Sat unsigned long long _Fract', 'short _Accum',
'_Accum', 'long _Accum', 'long long _Accum', 'unsigned short _Accum',
'unsigned _Accum', 'unsigned long _Accum', 'unsigned long long _Accum',
'_Sat short _Accum', '_Sat _Accum', '_Sat long _Accum', '_Sat long long
_Accum', '_Sat unsigned short _Accum', '_Sat unsigned _Accum', '_Sat
unsigned long _Accum', '_Sat unsigned long long _Accum'. Fixed-point
data values contain fractional and optional integral parts. The format
of fixed-point data varies and depends on the target machine.
Support for fixed-point types includes prefix and postfix increment and
decrement operators ('++', '--'); unary arithmetic operators ('+', '-',
'!'); binary arithmetic operators ('+', '-', '*', '/'); binary shift
operators ('<<', '>>'); relational operators ('<', '<=', '>=', '>');
equality operators ('==', '!='); assignment operators ('+=', '-=', '*=',
'/=', '<<=', '>>='); and conversions to and from integer,
floating-point, or fixed-point types.
Use a suffix 'hr' or 'HR' in a literal constant of type 'short _Fract'
and '_Sat short _Fract', 'r' or 'R' for '_Fract' and '_Sat _Fract', 'lr'
or 'LR' for 'long _Fract' and '_Sat long _Fract', 'llr' or 'LLR' for
'long long _Fract' and '_Sat long long _Fract', 'uhr' or 'UHR' for
'unsigned short _Fract' and '_Sat unsigned short _Fract', 'ur' or 'UR'
for 'unsigned _Fract' and '_Sat unsigned _Fract', 'ulr' or 'ULR' for
'unsigned long _Fract' and '_Sat unsigned long _Fract', 'ullr' or 'ULLR'
for 'unsigned long long _Fract' and '_Sat unsigned long long _Fract',
'hk' or 'HK' for 'short _Accum' and '_Sat short _Accum', 'k' or 'K' for
'_Accum' and '_Sat _Accum', 'lk' or 'LK' for 'long _Accum' and '_Sat
long _Accum', 'llk' or 'LLK' for 'long long _Accum' and '_Sat long long
_Accum', 'uhk' or 'UHK' for 'unsigned short _Accum' and '_Sat unsigned
short _Accum', 'uk' or 'UK' for 'unsigned _Accum' and '_Sat unsigned
_Accum', 'ulk' or 'ULK' for 'unsigned long _Accum' and '_Sat unsigned
long _Accum', and 'ullk' or 'ULLK' for 'unsigned long long _Accum' and
'_Sat unsigned long long _Accum'.
GCC support of fixed-point types as specified by the draft technical
report is incomplete:
* Pragmas to control overflow and rounding behaviors are not
implemented.
Fixed-point types are supported by the DWARF2 debug information format.

File: gcc.info, Node: Zero Length, Next: Empty Structures, Prev: Fixed-Point, Up: C Extensions
5.14 Arrays of Length Zero
==========================
Zero-length arrays are allowed in GNU C. They are very useful as the
last element of a structure which is really a header for a
variable-length object:
struct line {
int length;
char contents[0];
};
struct line *thisline = (struct line *)
malloc (sizeof (struct line) + this_length);
thisline->length = this_length;
In ISO C90, you would have to give 'contents' a length of 1, which
means either you waste space or complicate the argument to 'malloc'.
In ISO C99, you would use a "flexible array member", which is slightly
different in syntax and semantics:
* Flexible array members are written as 'contents[]' without the '0'.
* Flexible array members have incomplete type, and so the 'sizeof'
operator may not be applied. As a quirk of the original
implementation of zero-length arrays, 'sizeof' evaluates to zero.
* Flexible array members may only appear as the last member of a
'struct' that is otherwise non-empty.
* A structure containing a flexible array member, or a union
containing such a structure (possibly recursively), may not be a
member of a structure or an element of an array. (However, these
uses are permitted by GCC as extensions.)
GCC versions before 3.0 allowed zero-length arrays to be statically
initialized, as if they were flexible arrays. In addition to those
cases that were useful, it also allowed initializations in situations
that would corrupt later data. Non-empty initialization of zero-length
arrays is now treated like any case where there are more initializer
elements than the array holds, in that a suitable warning about "excess
elements in array" is given, and the excess elements (all of them, in
this case) are ignored.
Instead GCC allows static initialization of flexible array members.
This is equivalent to defining a new structure containing the original
structure followed by an array of sufficient size to contain the data.
I.e. in the following, 'f1' is constructed as if it were declared like
'f2'.
struct f1 {
int x; int y[];
} f1 = { 1, { 2, 3, 4 } };
struct f2 {
struct f1 f1; int data[3];
} f2 = { { 1 }, { 2, 3, 4 } };
The convenience of this extension is that 'f1' has the desired type,
eliminating the need to consistently refer to 'f2.f1'.
This has symmetry with normal static arrays, in that an array of
unknown size is also written with '[]'.
Of course, this extension only makes sense if the extra data comes at
the end of a top-level object, as otherwise we would be overwriting data
at subsequent offsets. To avoid undue complication and confusion with
initialization of deeply nested arrays, we simply disallow any non-empty
initialization except when the structure is the top-level object. For
example:
struct foo { int x; int y[]; };
struct bar { struct foo z; };
struct foo a = { 1, { 2, 3, 4 } }; // Valid.
struct bar b = { { 1, { 2, 3, 4 } } }; // Invalid.
struct bar c = { { 1, { } } }; // Valid.
struct foo d[1] = { { 1 { 2, 3, 4 } } }; // Invalid.

File: gcc.info, Node: Empty Structures, Next: Variable Length, Prev: Zero Length, Up: C Extensions
5.15 Structures With No Members
===============================
GCC permits a C structure to have no members:
struct empty {
};
The structure will have size zero. In C++, empty structures are part
of the language. G++ treats empty structures as if they had a single
member of type 'char'.

File: gcc.info, Node: Variable Length, Next: Variadic Macros, Prev: Empty Structures, Up: C Extensions
5.16 Arrays of Variable Length
==============================
Variable-length automatic arrays are allowed in ISO C99, and as an
extension GCC accepts them in C89 mode and in C++. (However, GCC's
implementation of variable-length arrays does not yet conform in detail
to the ISO C99 standard.) These arrays are declared like any other
automatic arrays, but with a length that is not a constant expression.
The storage is allocated at the point of declaration and deallocated
when the brace-level is exited. For example:
FILE *
concat_fopen (char *s1, char *s2, char *mode)
{
char str[strlen (s1) + strlen (s2) + 1];
strcpy (str, s1);
strcat (str, s2);
return fopen (str, mode);
}
Jumping or breaking out of the scope of the array name deallocates the
storage. Jumping into the scope is not allowed; you get an error
message for it.
You can use the function 'alloca' to get an effect much like
variable-length arrays. The function 'alloca' is available in many
other C implementations (but not in all). On the other hand,
variable-length arrays are more elegant.
There are other differences between these two methods. Space allocated
with 'alloca' exists until the containing _function_ returns. The space
for a variable-length array is deallocated as soon as the array name's
scope ends. (If you use both variable-length arrays and 'alloca' in the
same function, deallocation of a variable-length array will also
deallocate anything more recently allocated with 'alloca'.)
You can also use variable-length arrays as arguments to functions:
struct entry
tester (int len, char data[len][len])
{
/* ... */
}
The length of an array is computed once when the storage is allocated
and is remembered for the scope of the array in case you access it with
'sizeof'.
If you want to pass the array first and the length afterward, you can
use a forward declaration in the parameter list--another GNU extension.
struct entry
tester (int len; char data[len][len], int len)
{
/* ... */
}
The 'int len' before the semicolon is a "parameter forward
declaration", and it serves the purpose of making the name 'len' known
when the declaration of 'data' is parsed.
You can write any number of such parameter forward declarations in the
parameter list. They can be separated by commas or semicolons, but the
last one must end with a semicolon, which is followed by the "real"
parameter declarations. Each forward declaration must match a "real"
declaration in parameter name and data type. ISO C99 does not support
parameter forward declarations.

File: gcc.info, Node: Variadic Macros, Next: Escaped Newlines, Prev: Variable Length, Up: C Extensions
5.17 Macros with a Variable Number of Arguments.
================================================
In the ISO C standard of 1999, a macro can be declared to accept a
variable number of arguments much as a function can. The syntax for
defining the macro is similar to that of a function. Here is an
example:
#define debug(format, ...) fprintf (stderr, format, __VA_ARGS__)
Here '...' is a "variable argument". In the invocation of such a
macro, it represents the zero or more tokens until the closing
parenthesis that ends the invocation, including any commas. This set of
tokens replaces the identifier '__VA_ARGS__' in the macro body wherever
it appears. See the CPP manual for more information.
GCC has long supported variadic macros, and used a different syntax
that allowed you to give a name to the variable arguments just like any
other argument. Here is an example:
#define debug(format, args...) fprintf (stderr, format, args)
This is in all ways equivalent to the ISO C example above, but arguably
more readable and descriptive.
GNU CPP has two further variadic macro extensions, and permits them to
be used with either of the above forms of macro definition.
In standard C, you are not allowed to leave the variable argument out
entirely; but you are allowed to pass an empty argument. For example,
this invocation is invalid in ISO C, because there is no comma after the
string:
debug ("A message")
GNU CPP permits you to completely omit the variable arguments in this
way. In the above examples, the compiler would complain, though since
the expansion of the macro still has the extra comma after the format
string.
To help solve this problem, CPP behaves specially for variable
arguments used with the token paste operator, '##'. If instead you
write
#define debug(format, ...) fprintf (stderr, format, ## __VA_ARGS__)
and if the variable arguments are omitted or empty, the '##' operator
causes the preprocessor to remove the comma before it. If you do
provide some variable arguments in your macro invocation, GNU CPP does
not complain about the paste operation and instead places the variable
arguments after the comma. Just like any other pasted macro argument,
these arguments are not macro expanded.

File: gcc.info, Node: Escaped Newlines, Next: Subscripting, Prev: Variadic Macros, Up: C Extensions
5.18 Slightly Looser Rules for Escaped Newlines
===============================================
Recently, the preprocessor has relaxed its treatment of escaped
newlines. Previously, the newline had to immediately follow a
backslash. The current implementation allows whitespace in the form of
spaces, horizontal and vertical tabs, and form feeds between the
backslash and the subsequent newline. The preprocessor issues a
warning, but treats it as a valid escaped newline and combines the two
lines to form a single logical line. This works within comments and
tokens, as well as between tokens. Comments are _not_ treated as
whitespace for the purposes of this relaxation, since they have not yet
been replaced with spaces.

File: gcc.info, Node: Subscripting, Next: Pointer Arith, Prev: Escaped Newlines, Up: C Extensions
5.19 Non-Lvalue Arrays May Have Subscripts
==========================================
In ISO C99, arrays that are not lvalues still decay to pointers, and may
be subscripted, although they may not be modified or used after the next
sequence point and the unary '&' operator may not be applied to them.
As an extension, GCC allows such arrays to be subscripted in C89 mode,
though otherwise they do not decay to pointers outside C99 mode. For
example, this is valid in GNU C though not valid in C89:
struct foo {int a[4];};
struct foo f();
bar (int index)
{
return f().a[index];
}

File: gcc.info, Node: Pointer Arith, Next: Initializers, Prev: Subscripting, Up: C Extensions
5.20 Arithmetic on 'void'- and Function-Pointers
================================================
In GNU C, addition and subtraction operations are supported on pointers
to 'void' and on pointers to functions. This is done by treating the
size of a 'void' or of a function as 1.
A consequence of this is that 'sizeof' is also allowed on 'void' and on
function types, and returns 1.
The option '-Wpointer-arith' requests a warning if these extensions are
used.

File: gcc.info, Node: Initializers, Next: Compound Literals, Prev: Pointer Arith, Up: C Extensions
5.21 Non-Constant Initializers
==============================
As in standard C++ and ISO C99, the elements of an aggregate initializer
for an automatic variable are not required to be constant expressions in
GNU C. Here is an example of an initializer with run-time varying
elements:
foo (float f, float g)
{
float beat_freqs[2] = { f-g, f+g };
/* ... */
}

File: gcc.info, Node: Compound Literals, Next: Designated Inits, Prev: Initializers, Up: C Extensions
5.22 Compound Literals
======================
ISO C99 supports compound literals. A compound literal looks like a
cast containing an initializer. Its value is an object of the type
specified in the cast, containing the elements specified in the
initializer; it is an lvalue. As an extension, GCC supports compound
literals in C89 mode and in C++.
Usually, the specified type is a structure. Assume that 'struct foo'
and 'structure' are declared as shown:
struct foo {int a; char b[2];} structure;
Here is an example of constructing a 'struct foo' with a compound
literal:
structure = ((struct foo) {x + y, 'a', 0});
This is equivalent to writing the following:
{
struct foo temp = {x + y, 'a', 0};
structure = temp;
}
You can also construct an array. If all the elements of the compound
literal are (made up of) simple constant expressions, suitable for use
in initializers of objects of static storage duration, then the compound
literal can be coerced to a pointer to its first element and used in
such an initializer, as shown here:
char **foo = (char *[]) { "x", "y", "z" };
Compound literals for scalar types and union types are is also allowed,
but then the compound literal is equivalent to a cast.
As a GNU extension, GCC allows initialization of objects with static
storage duration by compound literals (which is not possible in ISO C99,
because the initializer is not a constant). It is handled as if the
object was initialized only with the bracket enclosed list if the types
of the compound literal and the object match. The initializer list of
the compound literal must be constant. If the object being initialized
has array type of unknown size, the size is determined by compound
literal size.
static struct foo x = (struct foo) {1, 'a', 'b'};
static int y[] = (int []) {1, 2, 3};
static int z[] = (int [3]) {1};
The above lines are equivalent to the following:
static struct foo x = {1, 'a', 'b'};
static int y[] = {1, 2, 3};
static int z[] = {1, 0, 0};

File: gcc.info, Node: Designated Inits, Next: Case Ranges, Prev: Compound Literals, Up: C Extensions
5.23 Designated Initializers
============================
Standard C89 requires the elements of an initializer to appear in a
fixed order, the same as the order of the elements in the array or
structure being initialized.
In ISO C99 you can give the elements in any order, specifying the array
indices or structure field names they apply to, and GNU C allows this as
an extension in C89 mode as well. This extension is not implemented in
GNU C++.
To specify an array index, write '[INDEX] =' before the element value.
For example,
int a[6] = { [4] = 29, [2] = 15 };
is equivalent to
int a[6] = { 0, 0, 15, 0, 29, 0 };
The index values must be constant expressions, even if the array being
initialized is automatic.
An alternative syntax for this which has been obsolete since GCC 2.5
but GCC still accepts is to write '[INDEX]' before the element value,
with no '='.
To initialize a range of elements to the same value, write '[FIRST ...
LAST] = VALUE'. This is a GNU extension. For example,
int widths[] = { [0 ... 9] = 1, [10 ... 99] = 2, [100] = 3 };
If the value in it has side-effects, the side-effects will happen only
once, not for each initialized field by the range initializer.
Note that the length of the array is the highest value specified plus
one.
In a structure initializer, specify the name of a field to initialize
with '.FIELDNAME =' before the element value. For example, given the
following structure,
struct point { int x, y; };
the following initialization
struct point p = { .y = yvalue, .x = xvalue };
is equivalent to
struct point p = { xvalue, yvalue };
Another syntax which has the same meaning, obsolete since GCC 2.5, is
'FIELDNAME:', as shown here:
struct point p = { y: yvalue, x: xvalue };
The '[INDEX]' or '.FIELDNAME' is known as a "designator". You can also
use a designator (or the obsolete colon syntax) when initializing a
union, to specify which element of the union should be used. For
example,
union foo { int i; double d; };
union foo f = { .d = 4 };
will convert 4 to a 'double' to store it in the union using the second
element. By contrast, casting 4 to type 'union foo' would store it into
the union as the integer 'i', since it is an integer. (*Note Cast to
Union::.)
You can combine this technique of naming elements with ordinary C
initialization of successive elements. Each initializer element that
does not have a designator applies to the next consecutive element of
the array or structure. For example,
int a[6] = { [1] = v1, v2, [4] = v4 };
is equivalent to
int a[6] = { 0, v1, v2, 0, v4, 0 };
Labeling the elements of an array initializer is especially useful when
the indices are characters or belong to an 'enum' type. For example:
int whitespace[256]
= { [' '] = 1, ['\t'] = 1, ['\h'] = 1,
['\f'] = 1, ['\n'] = 1, ['\r'] = 1 };
You can also write a series of '.FIELDNAME' and '[INDEX]' designators
before an '=' to specify a nested subobject to initialize; the list is
taken relative to the subobject corresponding to the closest surrounding
brace pair. For example, with the 'struct point' declaration above:
struct point ptarray[10] = { [2].y = yv2, [2].x = xv2, [0].x = xv0 };
If the same field is initialized multiple times, it will have value from
the last initialization. If any such overridden initialization has
side-effect, it is unspecified whether the side-effect happens or not.
Currently, GCC will discard them and issue a warning.

File: gcc.info, Node: Case Ranges, Next: Cast to Union, Prev: Designated Inits, Up: C Extensions
5.24 Case Ranges
================
You can specify a range of consecutive values in a single 'case' label,
like this:
case LOW ... HIGH:
This has the same effect as the proper number of individual 'case'
labels, one for each integer value from LOW to HIGH, inclusive.
This feature is especially useful for ranges of ASCII character codes:
case 'A' ... 'Z':
*Be careful:* Write spaces around the '...', for otherwise it may be
parsed wrong when you use it with integer values. For example, write
this:
case 1 ... 5:
rather than this:
case 1...5:

File: gcc.info, Node: Cast to Union, Next: Mixed Declarations, Prev: Case Ranges, Up: C Extensions
5.25 Cast to a Union Type
=========================
A cast to union type is similar to other casts, except that the type
specified is a union type. You can specify the type either with 'union
TAG' or with a typedef name. A cast to union is actually a constructor
though, not a cast, and hence does not yield an lvalue like normal
casts. (*Note Compound Literals::.)
The types that may be cast to the union type are those of the members
of the union. Thus, given the following union and variables:
union foo { int i; double d; };
int x;
double y;
both 'x' and 'y' can be cast to type 'union foo'.
Using the cast as the right-hand side of an assignment to a variable of
union type is equivalent to storing in a member of the union:
union foo u;
/* ... */
u = (union foo) x == u.i = x
u = (union foo) y == u.d = y
You can also use the union cast as a function argument:
void hack (union foo);
/* ... */
hack ((union foo) x);

File: gcc.info, Node: Mixed Declarations, Next: Function Attributes, Prev: Cast to Union, Up: C Extensions
5.26 Mixed Declarations and Code
================================
ISO C99 and ISO C++ allow declarations and code to be freely mixed
within compound statements. As an extension, GCC also allows this in
C89 mode. For example, you could do:
int i;
/* ... */
i++;
int j = i + 2;
Each identifier is visible from where it is declared until the end of
the enclosing block.

File: gcc.info, Node: Function Attributes, Next: Attribute Syntax, Prev: Mixed Declarations, Up: C Extensions
5.27 Declaring Attributes of Functions
======================================
In GNU C, you declare certain things about functions called in your
program which help the compiler optimize function calls and check your
code more carefully.
The keyword '__attribute__' allows you to specify special attributes
when making a declaration. This keyword is followed by an attribute
specification inside double parentheses. The following attributes are
currently defined for functions on all targets: 'aligned', 'alloc_size',
'noreturn', 'returns_twice', 'noinline', 'always_inline', 'flatten',
'pure', 'const', 'nothrow', 'sentinel', 'format', 'format_arg',
'no_instrument_function', 'section', 'constructor', 'destructor',
'used', 'unused', 'deprecated', 'weak', 'malloc', 'alias',
'warn_unused_result', 'nonnull', 'gnu_inline', 'externally_visible',
'hot', 'cold', 'artificial', 'error' and 'warning'. Several other
attributes are defined for functions on particular target systems.
Other attributes, including 'section' are supported for variables
declarations (*note Variable Attributes::) and for types (*note Type
Attributes::).
You may also specify attributes with '__' preceding and following each
keyword. This allows you to use them in header files without being
concerned about a possible macro of the same name. For example, you may
use '__noreturn__' instead of 'noreturn'.
*Note Attribute Syntax::, for details of the exact syntax for using
attributes.
'alias ("TARGET")'
The 'alias' attribute causes the declaration to be emitted as an
alias for another symbol, which must be specified. For instance,
void __f () { /* Do something. */; }
void f () __attribute__ ((weak, alias ("__f")));
defines 'f' to be a weak alias for '__f'. In C++, the mangled name
for the target must be used. It is an error if '__f' is not
defined in the same translation unit.
Not all target machines support this attribute.
'aligned (ALIGNMENT)'
This attribute specifies a minimum alignment for the function,
measured in bytes.
You cannot use this attribute to decrease the alignment of a
function, only to increase it. However, when you explicitly
specify a function alignment this will override the effect of the
'-falign-functions' (*note Optimize Options::) option for this
function.
Note that the effectiveness of 'aligned' attributes may be limited
by inherent limitations in your linker. On many systems, the
linker is only able to arrange for functions to be aligned up to a
certain maximum alignment. (For some linkers, the maximum
supported alignment may be very very small.) See your linker
documentation for further information.
The 'aligned' attribute can also be used for variables and fields
(*note Variable Attributes::.)
'alloc_size'
The 'alloc_size' attribute is used to tell the compiler that the
function return value points to memory, where the size is given by
one or two of the functions parameters. GCC uses this information
to improve the correctness of '__builtin_object_size'.
The function parameter(s) denoting the allocated size are specified
by one or two integer arguments supplied to the attribute. The
allocated size is either the value of the single function argument
specified or the product of the two function arguments specified.
Argument numbering starts at one.
For instance,
void* my_calloc(size_t, size_t) __attribute__((alloc_size(1,2)))
void my_realloc(void* size_t) __attribute__((alloc_size(2)))
declares that my_calloc will return memory of the size given by the
product of parameter 1 and 2 and that my_realloc will return memory
of the size given by parameter 2.
'always_inline'
Generally, functions are not inlined unless optimization is
specified. For functions declared inline, this attribute inlines
the function even if no optimization level was specified.
'gnu_inline'
This attribute should be used with a function which is also
declared with the 'inline' keyword. It directs GCC to treat the
function as if it were defined in gnu89 mode even when compiling in
C99 or gnu99 mode.
If the function is declared 'extern', then this definition of the
function is used only for inlining. In no case is the function
compiled as a standalone function, not even if you take its address
explicitly. Such an address becomes an external reference, as if
you had only declared the function, and had not defined it. This
has almost the effect of a macro. The way to use this is to put a
function definition in a header file with this attribute, and put
another copy of the function, without 'extern', in a library file.
The definition in the header file will cause most calls to the
function to be inlined. If any uses of the function remain, they
will refer to the single copy in the library. Note that the two
definitions of the functions need not be precisely the same,
although if they do not have the same effect your program may
behave oddly.
In C, if the function is neither 'extern' nor 'static', then the
function is compiled as a standalone function, as well as being
inlined where possible.
This is how GCC traditionally handled functions declared 'inline'.
Since ISO C99 specifies a different semantics for 'inline', this
function attribute is provided as a transition measure and as a
useful feature in its own right. This attribute is available in
GCC 4.1.3 and later. It is available if either of the preprocessor
macros '__GNUC_GNU_INLINE__' or '__GNUC_STDC_INLINE__' are defined.
*Note An Inline Function is As Fast As a Macro: Inline.
In C++, this attribute does not depend on 'extern' in any way, but
it still requires the 'inline' keyword to enable its special
behavior.
'artificial'
This attribute is useful for small inline wrappers which if
possible should appear during debugging as a unit, depending on the
debug info format it will either mean marking the function as
artificial or using the caller location for all instructions within
the inlined body.
'flatten'
Generally, inlining into a function is limited. For a function
marked with this attribute, every call inside this function will be
inlined, if possible. Whether the function itself is considered
for inlining depends on its size and the current inlining
parameters. The 'flatten' attribute only works reliably in
unit-at-a-time mode.
'error ("MESSAGE")'
If this attribute is used on a function declaration and a call to
such a function is not eliminated through dead code elimination or
other optimizations, an error which will include MESSAGE will be
diagnosed. This is useful for compile time checking, especially
together with '__builtin_constant_p' and inline functions where
checking the inline function arguments is not possible through
'extern char [(condition) ? 1 : -1];' tricks. While it is possible
to leave the function undefined and thus invoke a link failure,
when using this attribute the problem will be diagnosed earlier and
with exact location of the call even in presence of inline
functions or when not emitting debugging information.
'warning ("MESSAGE")'
If this attribute is used on a function declaration and a call to
such a function is not eliminated through dead code elimination or
other optimizations, a warning which will include MESSAGE will be
diagnosed. This is useful for compile time checking, especially
together with '__builtin_constant_p' and inline functions. While
it is possible to define the function with a message in
'.gnu.warning*' section, when using this attribute the problem will
be diagnosed earlier and with exact location of the call even in
presence of inline functions or when not emitting debugging
information.
'cdecl'
On the Intel 386, the 'cdecl' attribute causes the compiler to
assume that the calling function will pop off the stack space used
to pass arguments. This is useful to override the effects of the
'-mrtd' switch.
'const'
Many functions do not examine any values except their arguments,
and have no effects except the return value. Basically this is
just slightly more strict class than the 'pure' attribute below,
since function is not allowed to read global memory.
Note that a function that has pointer arguments and examines the
data pointed to must _not_ be declared 'const'. Likewise, a
function that calls a non-'const' function usually must not be
'const'. It does not make sense for a 'const' function to return
'void'.
The attribute 'const' is not implemented in GCC versions earlier
than 2.5. An alternative way to declare that a function has no
side effects, which works in the current version and in some older
versions, is as follows:
typedef int intfn ();
extern const intfn square;
This approach does not work in GNU C++ from 2.6.0 on, since the
language specifies that the 'const' must be attached to the return
value.
'constructor'
'destructor'
'constructor (PRIORITY)'
'destructor (PRIORITY)'
The 'constructor' attribute causes the function to be called
automatically before execution enters 'main ()'. Similarly, the
'destructor' attribute causes the function to be called
automatically after 'main ()' has completed or 'exit ()' has been
called. Functions with these attributes are useful for
initializing data that will be used implicitly during the execution
of the program.
You may provide an optional integer priority to control the order
in which constructor and destructor functions are run. A
constructor with a smaller priority number runs before a
constructor with a larger priority number; the opposite
relationship holds for destructors. So, if you have a constructor
that allocates a resource and a destructor that deallocates the
same resource, both functions typically have the same priority.
The priorities for constructor and destructor functions are the
same as those specified for namespace-scope C++ objects (*note C++
Attributes::).
These attributes are not currently implemented for Objective-C.
'deprecated'
The 'deprecated' attribute results in a warning if the function is
used anywhere in the source file. This is useful when identifying
functions that are expected to be removed in a future version of a
program. The warning also includes the location of the declaration
of the deprecated function, to enable users to easily find further
information about why the function is deprecated, or what they
should do instead. Note that the warnings only occurs for uses:
int old_fn () __attribute__ ((deprecated));
int old_fn ();
int (*fn_ptr)() = old_fn;
results in a warning on line 3 but not line 2.
The 'deprecated' attribute can also be used for variables and types
(*note Variable Attributes::, *note Type Attributes::.)
'dllexport'
On Microsoft Windows targets and Symbian OS targets the 'dllexport'
attribute causes the compiler to provide a global pointer to a
pointer in a DLL, so that it can be referenced with the 'dllimport'
attribute. On Microsoft Windows targets, the pointer name is
formed by combining '_imp__' and the function or variable name.
You can use '__declspec(dllexport)' as a synonym for '__attribute__
((dllexport))' for compatibility with other compilers.
On systems that support the 'visibility' attribute, this attribute
also implies "default" visibility. It is an error to explicitly
specify any other visibility.
Currently, the 'dllexport' attribute is ignored for inlined
functions, unless the '-fkeep-inline-functions' flag has been used.
The attribute is also ignored for undefined symbols.
When applied to C++ classes, the attribute marks defined
non-inlined member functions and static data members as exports.
Static consts initialized in-class are not marked unless they are
also defined out-of-class.
For Microsoft Windows targets there are alternative methods for
including the symbol in the DLL's export table such as using a
'.def' file with an 'EXPORTS' section or, with GNU ld, using the
'--export-all' linker flag.
'dllimport'
On Microsoft Windows and Symbian OS targets, the 'dllimport'
attribute causes the compiler to reference a function or variable
via a global pointer to a pointer that is set up by the DLL
exporting the symbol. The attribute implies 'extern'. On
Microsoft Windows targets, the pointer name is formed by combining
'_imp__' and the function or variable name.
You can use '__declspec(dllimport)' as a synonym for '__attribute__
((dllimport))' for compatibility with other compilers.
On systems that support the 'visibility' attribute, this attribute
also implies "default" visibility. It is an error to explicitly
specify any other visibility.
Currently, the attribute is ignored for inlined functions. If the
attribute is applied to a symbol _definition_, an error is
reported. If a symbol previously declared 'dllimport' is later
defined, the attribute is ignored in subsequent references, and a
warning is emitted. The attribute is also overridden by a
subsequent declaration as 'dllexport'.
When applied to C++ classes, the attribute marks non-inlined member
functions and static data members as imports. However, the
attribute is ignored for virtual methods to allow creation of
vtables using thunks.
On the SH Symbian OS target the 'dllimport' attribute also has
another affect--it can cause the vtable and run-time type
information for a class to be exported. This happens when the
class has a dllimport'ed constructor or a non-inline, non-pure
virtual function and, for either of those two conditions, the class
also has a inline constructor or destructor and has a key function
that is defined in the current translation unit.
For Microsoft Windows based targets the use of the 'dllimport'
attribute on functions is not necessary, but provides a small
performance benefit by eliminating a thunk in the DLL. The use of
the 'dllimport' attribute on imported variables was required on
older versions of the GNU linker, but can now be avoided by passing
the '--enable-auto-import' switch to the GNU linker. As with
functions, using the attribute for a variable eliminates a thunk in
the DLL.
One drawback to using this attribute is that a pointer to a
_variable_ marked as 'dllimport' cannot be used as a constant
address. However, a pointer to a _function_ with the 'dllimport'
attribute can be used as a constant initializer; in this case, the
address of a stub function in the import lib is referenced. On
Microsoft Windows targets, the attribute can be disabled for
functions by setting the '-mnop-fun-dllimport' flag.
'eightbit_data'
Use this attribute on the H8/300, H8/300H, and H8S to indicate that
the specified variable should be placed into the eight bit data
section. The compiler will generate more efficient code for
certain operations on data in the eight bit data area. Note the
eight bit data area is limited to 256 bytes of data.
You must use GAS and GLD from GNU binutils version 2.7 or later for
this attribute to work correctly.
'exception_handler'
Use this attribute on the Blackfin to indicate that the specified
function is an exception handler. The compiler will generate
function entry and exit sequences suitable for use in an exception
handler when this attribute is present.
'far'
On 68HC11 and 68HC12 the 'far' attribute causes the compiler to use
a calling convention that takes care of switching memory banks when
entering and leaving a function. This calling convention is also
the default when using the '-mlong-calls' option.
On 68HC12 the compiler will use the 'call' and 'rtc' instructions
to call and return from a function.
On 68HC11 the compiler will generate a sequence of instructions to
invoke a board-specific routine to switch the memory bank and call
the real function. The board-specific routine simulates a 'call'.
At the end of a function, it will jump to a board-specific routine
instead of using 'rts'. The board-specific return routine
simulates the 'rtc'.
'fastcall'
On the Intel 386, the 'fastcall' attribute causes the compiler to
pass the first argument (if of integral type) in the register ECX
and the second argument (if of integral type) in the register EDX.
Subsequent and other typed arguments are passed on the stack. The
called function will pop the arguments off the stack. If the
number of arguments is variable all arguments are pushed on the
stack.
'format (ARCHETYPE, STRING-INDEX, FIRST-TO-CHECK)'
The 'format' attribute specifies that a function takes 'printf',
'scanf', 'strftime' or 'strfmon' style arguments which should be
type-checked against a format string. For example, the
declaration:
extern int
my_printf (void *my_object, const char *my_format, ...)
__attribute__ ((format (printf, 2, 3)));
causes the compiler to check the arguments in calls to 'my_printf'
for consistency with the 'printf' style format string argument
'my_format'.
The parameter ARCHETYPE determines how the format string is
interpreted, and should be 'printf', 'scanf', 'strftime' or
'strfmon'. (You can also use '__printf__', '__scanf__',
'__strftime__' or '__strfmon__'.) The parameter STRING-INDEX
specifies which argument is the format string argument (starting
from 1), while FIRST-TO-CHECK is the number of the first argument
to check against the format string. For functions where the
arguments are not available to be checked (such as 'vprintf'),
specify the third parameter as zero. In this case the compiler
only checks the format string for consistency. For 'strftime'
formats, the third parameter is required to be zero. Since
non-static C++ methods have an implicit 'this' argument, the
arguments of such methods should be counted from two, not one, when
giving values for STRING-INDEX and FIRST-TO-CHECK.
In the example above, the format string ('my_format') is the second
argument of the function 'my_print', and the arguments to check
start with the third argument, so the correct parameters for the
format attribute are 2 and 3.
The 'format' attribute allows you to identify your own functions
which take format strings as arguments, so that GCC can check the
calls to these functions for errors. The compiler always (unless
'-ffreestanding' or '-fno-builtin' is used) checks formats for the
standard library functions 'printf', 'fprintf', 'sprintf', 'scanf',
'fscanf', 'sscanf', 'strftime', 'vprintf', 'vfprintf' and
'vsprintf' whenever such warnings are requested (using '-Wformat'),
so there is no need to modify the header file 'stdio.h'. In C99
mode, the functions 'snprintf', 'vsnprintf', 'vscanf', 'vfscanf'
and 'vsscanf' are also checked. Except in strictly conforming C
standard modes, the X/Open function 'strfmon' is also checked as
are 'printf_unlocked' and 'fprintf_unlocked'. *Note Options
Controlling C Dialect: C Dialect Options.
The target may provide additional types of format checks. *Note
Format Checks Specific to Particular Target Machines: Target Format
Checks.
'format_arg (STRING-INDEX)'
The 'format_arg' attribute specifies that a function takes a format
string for a 'printf', 'scanf', 'strftime' or 'strfmon' style
function and modifies it (for example, to translate it into another
language), so the result can be passed to a 'printf', 'scanf',
'strftime' or 'strfmon' style function (with the remaining
arguments to the format function the same as they would have been
for the unmodified string). For example, the declaration:
extern char *
my_dgettext (char *my_domain, const char *my_format)
__attribute__ ((format_arg (2)));
causes the compiler to check the arguments in calls to a 'printf',
'scanf', 'strftime' or 'strfmon' type function, whose format string
argument is a call to the 'my_dgettext' function, for consistency
with the format string argument 'my_format'. If the 'format_arg'
attribute had not been specified, all the compiler could tell in
such calls to format functions would be that the format string
argument is not constant; this would generate a warning when
'-Wformat-nonliteral' is used, but the calls could not be checked
without the attribute.
The parameter STRING-INDEX specifies which argument is the format
string argument (starting from one). Since non-static C++ methods
have an implicit 'this' argument, the arguments of such methods
should be counted from two.
The 'format-arg' attribute allows you to identify your own
functions which modify format strings, so that GCC can check the
calls to 'printf', 'scanf', 'strftime' or 'strfmon' type function
whose operands are a call to one of your own function. The
compiler always treats 'gettext', 'dgettext', and 'dcgettext' in
this manner except when strict ISO C support is requested by
'-ansi' or an appropriate '-std' option, or '-ffreestanding' or
'-fno-builtin' is used. *Note Options Controlling C Dialect: C
Dialect Options.
'function_vector'
Use this attribute on the H8/300, H8/300H, and H8S to indicate that
the specified function should be called through the function
vector. Calling a function through the function vector will reduce
code size, however; the function vector has a limited size (maximum
128 entries on the H8/300 and 64 entries on the H8/300H and H8S)
and shares space with the interrupt vector.
You must use GAS and GLD from GNU binutils version 2.7 or later for
this attribute to work correctly.
On M16C/M32C targets, the 'function_vector' attribute declares a
special page subroutine call function. Use of this attribute
reduces the code size by 2 bytes for each call generated to the
subroutine. The argument to the attribute is the vector number
entry from the special page vector table which contains the 16
low-order bits of the subroutine's entry address. Each vector
table has special page number (18 to 255) which are used in 'jsrs'
instruction. Jump addresses of the routines are generated by
adding 0x0F0000 (in case of M16C targets) or 0xFF0000 (in case of
M32C targets), to the 2 byte addresses set in the vector table.
Therefore you need to ensure that all the special page vector
routines should get mapped within the address range 0x0F0000 to
0x0FFFFF (for M16C) and 0xFF0000 to 0xFFFFFF (for M32C).
In the following example 2 bytes will be saved for each call to
function 'foo'.
void foo (void) __attribute__((function_vector(0x18)));
void foo (void)
{
}
void bar (void)
{
foo();
}
If functions are defined in one file and are called in another
file, then be sure to write this declaration in both files.
This attribute is ignored for R8C target.
'interrupt'
Use this attribute on the ARM, AVR, CRX, M32C, M32R/D, m68k, MS1,
and Xstormy16 ports to indicate that the specified function is an
interrupt handler. The compiler will generate function entry and
exit sequences suitable for use in an interrupt handler when this
attribute is present.
Note, interrupt handlers for the Blackfin, H8/300, H8/300H, H8S,
and SH processors can be specified via the 'interrupt_handler'
attribute.
Note, on the AVR, interrupts will be enabled inside the function.
Note, for the ARM, you can specify the kind of interrupt to be
handled by adding an optional parameter to the interrupt attribute
like this:
void f () __attribute__ ((interrupt ("IRQ")));
Permissible values for this parameter are: IRQ, FIQ, SWI, ABORT and
UNDEF.
On ARMv7-M the interrupt type is ignored, and the attribute means
the function may be called with a word aligned stack pointer.
'interrupt_handler'
Use this attribute on the Blackfin, m68k, H8/300, H8/300H, H8S, and
SH to indicate that the specified function is an interrupt handler.
The compiler will generate function entry and exit sequences
suitable for use in an interrupt handler when this attribute is
present.
'interrupt_thread'
Use this attribute on fido, a subarchitecture of the m68k, to
indicate that the specified function is an interrupt handler that
is designed to run as a thread. The compiler omits generate
prologue/epilogue sequences and replaces the return instruction
with a 'sleep' instruction. This attribute is available only on
fido.
'kspisusp'
When used together with 'interrupt_handler', 'exception_handler' or
'nmi_handler', code will be generated to load the stack pointer
from the USP register in the function prologue.
'l1_text'
This attribute specifies a function to be placed into L1
Instruction SRAM. The function will be put into a specific section
named '.l1.text'. With '-mfdpic', function calls with a such
function as the callee or caller will use inlined PLT.
'long_call/short_call'
This attribute specifies how a particular function is called on
ARM. Both attributes override the '-mlong-calls' (*note ARM
Options::) command line switch and '#pragma long_calls' settings.
The 'long_call' attribute indicates that the function might be far
away from the call site and require a different (more expensive)
calling sequence. The 'short_call' attribute always places the
offset to the function from the call site into the 'BL' instruction
directly.
'longcall/shortcall'
On the Blackfin, RS/6000 and PowerPC, the 'longcall' attribute
indicates that the function might be far away from the call site
and require a different (more expensive) calling sequence. The
'shortcall' attribute indicates that the function is always close
enough for the shorter calling sequence to be used. These
attributes override both the '-mlongcall' switch and, on the
RS/6000 and PowerPC, the '#pragma longcall' setting.
*Note RS/6000 and PowerPC Options::, for more information on
whether long calls are necessary.
'long_call/near/far'
These attributes specify how a particular function is called on
MIPS. The attributes override the '-mlong-calls' (*note MIPS
Options::) command-line switch. The 'long_call' and 'far'
attributes are synonyms, and cause the compiler to always call the
function by first loading its address into a register, and then
using the contents of that register. The 'near' attribute has the
opposite effect; it specifies that non-PIC calls should be made
using the more efficient 'jal' instruction.
'malloc'
The 'malloc' attribute is used to tell the compiler that a function
may be treated as if any non-'NULL' pointer it returns cannot alias
any other pointer valid when the function returns. This will often
improve optimization. Standard functions with this property
include 'malloc' and 'calloc'. 'realloc'-like functions have this
property as long as the old pointer is never referred to (including
comparing it to the new pointer) after the function returns a
non-'NULL' value.
'mips16/nomips16'
On MIPS targets, you can use the 'mips16' and 'nomips16' function
attributes to locally select or turn off MIPS16 code generation. A
function with the 'mips16' attribute is emitted as MIPS16 code,
while MIPS16 code generation is disabled for functions with the
'nomips16' attribute. These attributes override the '-mips16' and
'-mno-mips16' options on the command line (*note MIPS Options::).
When compiling files containing mixed MIPS16 and non-MIPS16 code,
the preprocessor symbol '__mips16' reflects the setting on the
command line, not that within individual functions. Mixed MIPS16
and non-MIPS16 code may interact badly with some GCC extensions
such as '__builtin_apply' (*note Constructing Calls::).
'model (MODEL-NAME)'
On the M32R/D, use this attribute to set the addressability of an
object, and of the code generated for a function. The identifier
MODEL-NAME is one of 'small', 'medium', or 'large', representing
each of the code models.
Small model objects live in the lower 16MB of memory (so that their
addresses can be loaded with the 'ld24' instruction), and are
callable with the 'bl' instruction.
Medium model objects may live anywhere in the 32-bit address space
(the compiler will generate 'seth/add3' instructions to load their
addresses), and are callable with the 'bl' instruction.
Large model objects may live anywhere in the 32-bit address space
(the compiler will generate 'seth/add3' instructions to load their
addresses), and may not be reachable with the 'bl' instruction (the
compiler will generate the much slower 'seth/add3/jl' instruction
sequence).
On IA-64, use this attribute to set the addressability of an
object. At present, the only supported identifier for MODEL-NAME
is 'small', indicating addressability via "small" (22-bit)
addresses (so that their addresses can be loaded with the 'addl'
instruction). Caveat: such addressing is by definition not
position independent and hence this attribute must not be used for
objects defined by shared libraries.
'naked'
Use this attribute on the ARM, AVR, IP2K and SPU ports to indicate
that the specified function does not need prologue/epilogue
sequences generated by the compiler. It is up to the programmer to
provide these sequences.
'near'
On 68HC11 and 68HC12 the 'near' attribute causes the compiler to
use the normal calling convention based on 'jsr' and 'rts'. This
attribute can be used to cancel the effect of the '-mlong-calls'
option.
'nesting'
Use this attribute together with 'interrupt_handler',
'exception_handler' or 'nmi_handler' to indicate that the function
entry code should enable nested interrupts or exceptions.
'nmi_handler'
Use this attribute on the Blackfin to indicate that the specified
function is an NMI handler. The compiler will generate function
entry and exit sequences suitable for use in an NMI handler when
this attribute is present.
'no_instrument_function'
If '-finstrument-functions' is given, profiling function calls will
be generated at entry and exit of most user-compiled functions.
Functions with this attribute will not be so instrumented.
'noinline'
This function attribute prevents a function from being considered
for inlining. If the function does not have side-effects, there
are optimizations other than inlining that causes function calls to
be optimized away, although the function call is live. To keep
such calls from being optimized away, put
asm ("");
(*note Extended Asm::) in the called function, to serve as a
special side-effect.
'nonnull (ARG-INDEX, ...)'
The 'nonnull' attribute specifies that some function parameters
should be non-null pointers. For instance, the declaration:
extern void *
my_memcpy (void *dest, const void *src, size_t len)
__attribute__((nonnull (1, 2)));
causes the compiler to check that, in calls to 'my_memcpy',
arguments DEST and SRC are non-null. If the compiler determines
that a null pointer is passed in an argument slot marked as
non-null, and the '-Wnonnull' option is enabled, a warning is
issued. The compiler may also choose to make optimizations based
on the knowledge that certain function arguments will not be null.
If no argument index list is given to the 'nonnull' attribute, all
pointer arguments are marked as non-null. To illustrate, the
following declaration is equivalent to the previous example:
extern void *
my_memcpy (void *dest, const void *src, size_t len)
__attribute__((nonnull));
'noreturn'
A few standard library functions, such as 'abort' and 'exit',
cannot return. GCC knows this automatically. Some programs define
their own functions that never return. You can declare them
'noreturn' to tell the compiler this fact. For example,
void fatal () __attribute__ ((noreturn));
void
fatal (/* ... */)
{
/* ... */ /* Print error message. */ /* ... */
exit (1);
}
The 'noreturn' keyword tells the compiler to assume that 'fatal'
cannot return. It can then optimize without regard to what would
happen if 'fatal' ever did return. This makes slightly better
code. More importantly, it helps avoid spurious warnings of
uninitialized variables.
The 'noreturn' keyword does not affect the exceptional path when
that applies: a 'noreturn'-marked function may still return to the
caller by throwing an exception or calling 'longjmp'.
Do not assume that registers saved by the calling function are
restored before calling the 'noreturn' function.
It does not make sense for a 'noreturn' function to have a return
type other than 'void'.
The attribute 'noreturn' is not implemented in GCC versions earlier
than 2.5. An alternative way to declare that a function does not
return, which works in the current version and in some older
versions, is as follows:
typedef void voidfn ();
volatile voidfn fatal;
This approach does not work in GNU C++.
'nothrow'
The 'nothrow' attribute is used to inform the compiler that a
function cannot throw an exception. For example, most functions in
the standard C library can be guaranteed not to throw an exception
with the notable exceptions of 'qsort' and 'bsearch' that take
function pointer arguments. The 'nothrow' attribute is not
implemented in GCC versions earlier than 3.3.
'pure'
Many functions have no effects except the return value and their
return value depends only on the parameters and/or global
variables. Such a function can be subject to common subexpression
elimination and loop optimization just as an arithmetic operator
would be. These functions should be declared with the attribute
'pure'. For example,
int square (int) __attribute__ ((pure));
says that the hypothetical function 'square' is safe to call fewer
times than the program says.
Some of common examples of pure functions are 'strlen' or 'memcmp'.
Interesting non-pure functions are functions with infinite loops or
those depending on volatile memory or other system resource, that
may change between two consecutive calls (such as 'feof' in a
multithreading environment).
The attribute 'pure' is not implemented in GCC versions earlier
than 2.96.
'hot'
The 'hot' attribute is used to inform the compiler that a function
is a hot spot of the compiled program. The function is optimized
more aggressively and on many target it is placed into special
subsection of the text section so all hot functions appears close
together improving locality.
When profile feedback is available, via '-fprofile-use', hot
functions are automatically detected and this attribute is ignored.
The 'hot' attribute is not implemented in GCC versions earlier than
4.3.
'cold'
The 'cold' attribute is used to inform the compiler that a function
is unlikely executed. The function is optimized for size rather
than speed and on many targets it is placed into special subsection
of the text section so all cold functions appears close together
improving code locality of non-cold parts of program. The paths
leading to call of cold functions within code are marked as
unlikely by the branch prediction mechanism. It is thus useful to
mark functions used to handle unlikely conditions, such as
'perror', as cold to improve optimization of hot functions that do
call marked functions in rare occasions.
When profile feedback is available, via '-fprofile-use', hot
functions are automatically detected and this attribute is ignored.
The 'hot' attribute is not implemented in GCC versions earlier than
4.3.
'regparm (NUMBER)'
On the Intel 386, the 'regparm' attribute causes the compiler to
pass arguments number one to NUMBER if they are of integral type in
registers EAX, EDX, and ECX instead of on the stack. Functions
that take a variable number of arguments will continue to be passed
all of their arguments on the stack.
Beware that on some ELF systems this attribute is unsuitable for
global functions in shared libraries with lazy binding (which is
the default). Lazy binding will send the first call via resolving
code in the loader, which might assume EAX, EDX and ECX can be
clobbered, as per the standard calling conventions. Solaris 8 is
affected by this. GNU systems with GLIBC 2.1 or higher, and
FreeBSD, are believed to be safe since the loaders there save all
registers. (Lazy binding can be disabled with the linker or the
loader if desired, to avoid the problem.)
'sseregparm'
On the Intel 386 with SSE support, the 'sseregparm' attribute
causes the compiler to pass up to 3 floating point arguments in SSE
registers instead of on the stack. Functions that take a variable
number of arguments will continue to pass all of their floating
point arguments on the stack.
'force_align_arg_pointer'
On the Intel x86, the 'force_align_arg_pointer' attribute may be
applied to individual function definitions, generating an alternate
prologue and epilogue that realigns the runtime stack. This
supports mixing legacy codes that run with a 4-byte aligned stack
with modern codes that keep a 16-byte stack for SSE compatibility.
The alternate prologue and epilogue are slower and bigger than the
regular ones, and the alternate prologue requires a scratch
register; this lowers the number of registers available if used in
conjunction with the 'regparm' attribute. The
'force_align_arg_pointer' attribute is incompatible with nested
functions; this is considered a hard error.
'returns_twice'
The 'returns_twice' attribute tells the compiler that a function
may return more than one time. The compiler will ensure that all
registers are dead before calling such a function and will emit a
warning about the variables that may be clobbered after the second
return from the function. Examples of such functions are 'setjmp'
and 'vfork'. The 'longjmp'-like counterpart of such function, if
any, might need to be marked with the 'noreturn' attribute.
'saveall'
Use this attribute on the Blackfin, H8/300, H8/300H, and H8S to
indicate that all registers except the stack pointer should be
saved in the prologue regardless of whether they are used or not.
'section ("SECTION-NAME")'
Normally, the compiler places the code it generates in the 'text'
section. Sometimes, however, you need additional sections, or you
need certain particular functions to appear in special sections.
The 'section' attribute specifies that a function lives in a
particular section. For example, the declaration:
extern void foobar (void) __attribute__ ((section ("bar")));
puts the function 'foobar' in the 'bar' section.
Some file formats do not support arbitrary sections so the
'section' attribute is not available on all platforms. If you need
to map the entire contents of a module to a particular section,
consider using the facilities of the linker instead.
'sentinel'
This function attribute ensures that a parameter in a function call
is an explicit 'NULL'. The attribute is only valid on variadic
functions. By default, the sentinel is located at position zero,
the last parameter of the function call. If an optional integer
position argument P is supplied to the attribute, the sentinel must
be located at position P counting backwards from the end of the
argument list.
__attribute__ ((sentinel))
is equivalent to
__attribute__ ((sentinel(0)))
The attribute is automatically set with a position of 0 for the
built-in functions 'execl' and 'execlp'. The built-in function
'execle' has the attribute set with a position of 1.
A valid 'NULL' in this context is defined as zero with any pointer
type. If your system defines the 'NULL' macro with an integer type
then you need to add an explicit cast. GCC replaces 'stddef.h'
with a copy that redefines NULL appropriately.
The warnings for missing or incorrect sentinels are enabled with
'-Wformat'.
'short_call'
See long_call/short_call.
'shortcall'
See longcall/shortcall.
'signal'
Use this attribute on the AVR to indicate that the specified
function is a signal handler. The compiler will generate function
entry and exit sequences suitable for use in a signal handler when
this attribute is present. Interrupts will be disabled inside the
function.
'sp_switch'
Use this attribute on the SH to indicate an 'interrupt_handler'
function should switch to an alternate stack. It expects a string
argument that names a global variable holding the address of the
alternate stack.
void *alt_stack;
void f () __attribute__ ((interrupt_handler,
sp_switch ("alt_stack")));
'stdcall'
On the Intel 386, the 'stdcall' attribute causes the compiler to
assume that the called function will pop off the stack space used
to pass arguments, unless it takes a variable number of arguments.
'tiny_data'
Use this attribute on the H8/300H and H8S to indicate that the
specified variable should be placed into the tiny data section.
The compiler will generate more efficient code for loads and stores
on data in the tiny data section. Note the tiny data area is
limited to slightly under 32kbytes of data.
'trap_exit'
Use this attribute on the SH for an 'interrupt_handler' to return
using 'trapa' instead of 'rte'. This attribute expects an integer
argument specifying the trap number to be used.
'unused'
This attribute, attached to a function, means that the function is
meant to be possibly unused. GCC will not produce a warning for
this function.
'used'
This attribute, attached to a function, means that code must be
emitted for the function even if it appears that the function is
not referenced. This is useful, for example, when the function is
referenced only in inline assembly.
'version_id'
This attribute, attached to a global variable or function, renames
a symbol to contain a version string, thus allowing for function
level versioning. HP-UX system header files may use version level
functioning for some system calls.
extern int foo () __attribute__((version_id ("20040821")));
Calls to FOO will be mapped to calls to FOO{20040821}.
'visibility ("VISIBILITY_TYPE")'
This attribute affects the linkage of the declaration to which it
is attached. There are four supported VISIBILITY_TYPE values:
default, hidden, protected or internal visibility.
void __attribute__ ((visibility ("protected")))
f () { /* Do something. */; }
int i __attribute__ ((visibility ("hidden")));
The possible values of VISIBILITY_TYPE correspond to the visibility
settings in the ELF gABI.
"default"
Default visibility is the normal case for the object file
format. This value is available for the visibility attribute
to override other options that may change the assumed
visibility of entities.
On ELF, default visibility means that the declaration is
visible to other modules and, in shared libraries, means that
the declared entity may be overridden.
On Darwin, default visibility means that the declaration is
visible to other modules.
Default visibility corresponds to "external linkage" in the
language.
"hidden"
Hidden visibility indicates that the entity declared will have
a new form of linkage, which we'll call "hidden linkage". Two
declarations of an object with hidden linkage refer to the
same object if they are in the same shared object.
"internal"
Internal visibility is like hidden visibility, but with
additional processor specific semantics. Unless otherwise
specified by the psABI, GCC defines internal visibility to
mean that a function is _never_ called from another module.
Compare this with hidden functions which, while they cannot be
referenced directly by other modules, can be referenced
indirectly via function pointers. By indicating that a
function cannot be called from outside the module, GCC may for
instance omit the load of a PIC register since it is known
that the calling function loaded the correct value.
"protected"
Protected visibility is like default visibility except that it
indicates that references within the defining module will bind
to the definition in that module. That is, the declared
entity cannot be overridden by another module.
All visibilities are supported on many, but not all, ELF targets
(supported when the assembler supports the '.visibility'
pseudo-op). Default visibility is supported everywhere. Hidden
visibility is supported on Darwin targets.
The visibility attribute should be applied only to declarations
which would otherwise have external linkage. The attribute should
be applied consistently, so that the same entity should not be
declared with different settings of the attribute.
In C++, the visibility attribute applies to types as well as
functions and objects, because in C++ types have linkage. A class
must not have greater visibility than its non-static data member
types and bases, and class members default to the visibility of
their class. Also, a declaration without explicit visibility is
limited to the visibility of its type.
In C++, you can mark member functions and static member variables
of a class with the visibility attribute. This is useful if if you
know a particular method or static member variable should only be
used from one shared object; then you can mark it hidden while the
rest of the class has default visibility. Care must be taken to
avoid breaking the One Definition Rule; for example, it is usually
not useful to mark an inline method as hidden without marking the
whole class as hidden.
A C++ namespace declaration can also have the visibility attribute.
This attribute applies only to the particular namespace body, not
to other definitions of the same namespace; it is equivalent to
using '#pragma GCC visibility' before and after the namespace
definition (*note Visibility Pragmas::).
In C++, if a template argument has limited visibility, this
restriction is implicitly propagated to the template instantiation.
Otherwise, template instantiations and specializations default to
the visibility of their template.
If both the template and enclosing class have explicit visibility,
the visibility from the template is used.
'warn_unused_result'
The 'warn_unused_result' attribute causes a warning to be emitted
if a caller of the function with this attribute does not use its
return value. This is useful for functions where not checking the
result is either a security problem or always a bug, such as
'realloc'.
int fn () __attribute__ ((warn_unused_result));
int foo ()
{
if (fn () < 0) return -1;
fn ();
return 0;
}
results in warning on line 5.
'weak'
The 'weak' attribute causes the declaration to be emitted as a weak
symbol rather than a global. This is primarily useful in defining
library functions which can be overridden in user code, though it
can also be used with non-function declarations. Weak symbols are
supported for ELF targets, and also for a.out targets when using
the GNU assembler and linker.
'weakref'
'weakref ("TARGET")'
The 'weakref' attribute marks a declaration as a weak reference.
Without arguments, it should be accompanied by an 'alias' attribute
naming the target symbol. Optionally, the TARGET may be given as
an argument to 'weakref' itself. In either case, 'weakref'
implicitly marks the declaration as 'weak'. Without a TARGET,
given as an argument to 'weakref' or to 'alias', 'weakref' is
equivalent to 'weak'.
static int x() __attribute__ ((weakref ("y")));
/* is equivalent to... */
static int x() __attribute__ ((weak, weakref, alias ("y")));
/* and to... */
static int x() __attribute__ ((weakref));
static int x() __attribute__ ((alias ("y")));
A weak reference is an alias that does not by itself require a
definition to be given for the target symbol. If the target symbol
is only referenced through weak references, then the becomes a
'weak' undefined symbol. If it is directly referenced, however,
then such strong references prevail, and a definition will be
required for the symbol, not necessarily in the same translation
unit.
The effect is equivalent to moving all references to the alias to a
separate translation unit, renaming the alias to the aliased
symbol, declaring it as weak, compiling the two separate
translation units and performing a reloadable link on them.
At present, a declaration to which 'weakref' is attached can only
be 'static'.
'externally_visible'
This attribute, attached to a global variable or function nullify
effect of '-fwhole-program' command line option, so the object
remain visible outside the current compilation unit
You can specify multiple attributes in a declaration by separating them
by commas within the double parentheses or by immediately following an
attribute declaration with another attribute declaration.
Some people object to the '__attribute__' feature, suggesting that ISO
C's '#pragma' should be used instead. At the time '__attribute__' was
designed, there were two reasons for not doing this.
1. It is impossible to generate '#pragma' commands from a macro.
2. There is no telling what the same '#pragma' might mean in another
compiler.
These two reasons applied to almost any application that might have
been proposed for '#pragma'. It was basically a mistake to use
'#pragma' for _anything_.
The ISO C99 standard includes '_Pragma', which now allows pragmas to be
generated from macros. In addition, a '#pragma GCC' namespace is now in
use for GCC-specific pragmas. However, it has been found convenient to
use '__attribute__' to achieve a natural attachment of attributes to
their corresponding declarations, whereas '#pragma GCC' is of use for
constructs that do not naturally form part of the grammar. *Note
Miscellaneous Preprocessing Directives: (cpp)Other Directives.

File: gcc.info, Node: Attribute Syntax, Next: Function Prototypes, Prev: Function Attributes, Up: C Extensions
5.28 Attribute Syntax
=====================
This section describes the syntax with which '__attribute__' may be
used, and the constructs to which attribute specifiers bind, for the C
language. Some details may vary for C++ and Objective-C. Because of
infelicities in the grammar for attributes, some forms described here
may not be successfully parsed in all cases.
There are some problems with the semantics of attributes in C++. For
example, there are no manglings for attributes, although they may affect
code generation, so problems may arise when attributed types are used in
conjunction with templates or overloading. Similarly, 'typeid' does not
distinguish between types with different attributes. Support for
attributes in C++ may be restricted in future to attributes on
declarations only, but not on nested declarators.
*Note Function Attributes::, for details of the semantics of attributes
applying to functions. *Note Variable Attributes::, for details of the
semantics of attributes applying to variables. *Note Type Attributes::,
for details of the semantics of attributes applying to structure, union
and enumerated types.
An "attribute specifier" is of the form '__attribute__
((ATTRIBUTE-LIST))'. An "attribute list" is a possibly empty
comma-separated sequence of "attributes", where each attribute is one of
the following:
* Empty. Empty attributes are ignored.
* A word (which may be an identifier such as 'unused', or a reserved
word such as 'const').
* A word, followed by, in parentheses, parameters for the attribute.
These parameters take one of the following forms:
* An identifier. For example, 'mode' attributes use this form.
* An identifier followed by a comma and a non-empty
comma-separated list of expressions. For example, 'format'
attributes use this form.
* A possibly empty comma-separated list of expressions. For
example, 'format_arg' attributes use this form with the list
being a single integer constant expression, and 'alias'
attributes use this form with the list being a single string
constant.
An "attribute specifier list" is a sequence of one or more attribute
specifiers, not separated by any other tokens.
In GNU C, an attribute specifier list may appear after the colon
following a label, other than a 'case' or 'default' label. The only
attribute it makes sense to use after a label is 'unused'. This feature
is intended for code generated by programs which contains labels that
may be unused but which is compiled with '-Wall'. It would not normally
be appropriate to use in it human-written code, though it could be
useful in cases where the code that jumps to the label is contained
within an '#ifdef' conditional. GNU C++ does not permit such placement
of attribute lists, as it is permissible for a declaration, which could
begin with an attribute list, to be labelled in C++. Declarations
cannot be labelled in C90 or C99, so the ambiguity does not arise there.
An attribute specifier list may appear as part of a 'struct', 'union'
or 'enum' specifier. It may go either immediately after the 'struct',
'union' or 'enum' keyword, or after the closing brace. The former
syntax is preferred. Where attribute specifiers follow the closing
brace, they are considered to relate to the structure, union or
enumerated type defined, not to any enclosing declaration the type
specifier appears in, and the type defined is not complete until after
the attribute specifiers.
Otherwise, an attribute specifier appears as part of a declaration,
counting declarations of unnamed parameters and type names, and relates
to that declaration (which may be nested in another declaration, for
example in the case of a parameter declaration), or to a particular
declarator within a declaration. Where an attribute specifier is
applied to a parameter declared as a function or an array, it should
apply to the function or array rather than the pointer to which the
parameter is implicitly converted, but this is not yet correctly
implemented.
Any list of specifiers and qualifiers at the start of a declaration may
contain attribute specifiers, whether or not such a list may in that
context contain storage class specifiers. (Some attributes, however,
are essentially in the nature of storage class specifiers, and only make
sense where storage class specifiers may be used; for example,
'section'.) There is one necessary limitation to this syntax: the first
old-style parameter declaration in a function definition cannot begin
with an attribute specifier, because such an attribute applies to the
function instead by syntax described below (which, however, is not yet
implemented in this case). In some other cases, attribute specifiers
are permitted by this grammar but not yet supported by the compiler.
All attribute specifiers in this place relate to the declaration as a
whole. In the obsolescent usage where a type of 'int' is implied by the
absence of type specifiers, such a list of specifiers and qualifiers may
be an attribute specifier list with no other specifiers or qualifiers.
At present, the first parameter in a function prototype must have some
type specifier which is not an attribute specifier; this resolves an
ambiguity in the interpretation of 'void f(int (__attribute__((foo))
x))', but is subject to change. At present, if the parentheses of a
function declarator contain only attributes then those attributes are
ignored, rather than yielding an error or warning or implying a single
parameter of type int, but this is subject to change.
An attribute specifier list may appear immediately before a declarator
(other than the first) in a comma-separated list of declarators in a
declaration of more than one identifier using a single list of
specifiers and qualifiers. Such attribute specifiers apply only to the
identifier before whose declarator they appear. For example, in
__attribute__((noreturn)) void d0 (void),
__attribute__((format(printf, 1, 2))) d1 (const char *, ...),
d2 (void)
the 'noreturn' attribute applies to all the functions declared; the
'format' attribute only applies to 'd1'.
An attribute specifier list may appear immediately before the comma,
'=' or semicolon terminating the declaration of an identifier other than
a function definition. Such attribute specifiers apply to the declared
object or function. Where an assembler name for an object or function
is specified (*note Asm Labels::), the attribute must follow the 'asm'
specification.
An attribute specifier list may, in future, be permitted to appear
after the declarator in a function definition (before any old-style
parameter declarations or the function body).
Attribute specifiers may be mixed with type qualifiers appearing inside
the '[]' of a parameter array declarator, in the C99 construct by which
such qualifiers are applied to the pointer to which the array is
implicitly converted. Such attribute specifiers apply to the pointer,
not to the array, but at present this is not implemented and they are
ignored.
An attribute specifier list may appear at the start of a nested
declarator. At present, there are some limitations in this usage: the
attributes correctly apply to the declarator, but for most individual
attributes the semantics this implies are not implemented. When
attribute specifiers follow the '*' of a pointer declarator, they may be
mixed with any type qualifiers present. The following describes the
formal semantics of this syntax. It will make the most sense if you are
familiar with the formal specification of declarators in the ISO C
standard.
Consider (as in C99 subclause 6.7.5 paragraph 4) a declaration 'T D1',
where 'T' contains declaration specifiers that specify a type TYPE (such
as 'int') and 'D1' is a declarator that contains an identifier IDENT.
The type specified for IDENT for derived declarators whose type does not
include an attribute specifier is as in the ISO C standard.
If 'D1' has the form '( ATTRIBUTE-SPECIFIER-LIST D )', and the
declaration 'T D' specifies the type "DERIVED-DECLARATOR-TYPE-LIST TYPE"
for IDENT, then 'T D1' specifies the type "DERIVED-DECLARATOR-TYPE-LIST
ATTRIBUTE-SPECIFIER-LIST TYPE" for IDENT.
If 'D1' has the form '* TYPE-QUALIFIER-AND-ATTRIBUTE-SPECIFIER-LIST D',
and the declaration 'T D' specifies the type
"DERIVED-DECLARATOR-TYPE-LIST TYPE" for IDENT, then 'T D1' specifies the
type "DERIVED-DECLARATOR-TYPE-LIST
TYPE-QUALIFIER-AND-ATTRIBUTE-SPECIFIER-LIST TYPE" for IDENT.
For example,
void (__attribute__((noreturn)) ****f) (void);
specifies the type "pointer to pointer to pointer to pointer to
non-returning function returning 'void'". As another example,
char *__attribute__((aligned(8))) *f;
specifies the type "pointer to 8-byte-aligned pointer to 'char'". Note
again that this does not work with most attributes; for example, the
usage of 'aligned' and 'noreturn' attributes given above is not yet
supported.
For compatibility with existing code written for compiler versions that
did not implement attributes on nested declarators, some laxity is
allowed in the placing of attributes. If an attribute that only applies
to types is applied to a declaration, it will be treated as applying to
the type of that declaration. If an attribute that only applies to
declarations is applied to the type of a declaration, it will be treated
as applying to that declaration; and, for compatibility with code
placing the attributes immediately before the identifier declared, such
an attribute applied to a function return type will be treated as
applying to the function type, and such an attribute applied to an array
element type will be treated as applying to the array type. If an
attribute that only applies to function types is applied to a
pointer-to-function type, it will be treated as applying to the pointer
target type; if such an attribute is applied to a function return type
that is not a pointer-to-function type, it will be treated as applying
to the function type.

File: gcc.info, Node: Function Prototypes, Next: C++ Comments, Prev: Attribute Syntax, Up: C Extensions
5.29 Prototypes and Old-Style Function Definitions
==================================================
GNU C extends ISO C to allow a function prototype to override a later
old-style non-prototype definition. Consider the following example:
/* Use prototypes unless the compiler is old-fashioned. */
#ifdef __STDC__
#define P(x) x
#else
#define P(x) ()
#endif
/* Prototype function declaration. */
int isroot P((uid_t));
/* Old-style function definition. */
int
isroot (x) /* ??? lossage here ??? */
uid_t x;
{
return x == 0;
}
Suppose the type 'uid_t' happens to be 'short'. ISO C does not allow
this example, because subword arguments in old-style non-prototype
definitions are promoted. Therefore in this example the function
definition's argument is really an 'int', which does not match the
prototype argument type of 'short'.
This restriction of ISO C makes it hard to write code that is portable
to traditional C compilers, because the programmer does not know whether
the 'uid_t' type is 'short', 'int', or 'long'. Therefore, in cases like
these GNU C allows a prototype to override a later old-style definition.
More precisely, in GNU C, a function prototype argument type overrides
the argument type specified by a later old-style definition if the
former type is the same as the latter type before promotion. Thus in
GNU C the above example is equivalent to the following:
int isroot (uid_t);
int
isroot (uid_t x)
{
return x == 0;
}
GNU C++ does not support old-style function definitions, so this
extension is irrelevant.

File: gcc.info, Node: C++ Comments, Next: Dollar Signs, Prev: Function Prototypes, Up: C Extensions
5.30 C++ Style Comments
=======================
In GNU C, you may use C++ style comments, which start with '//' and
continue until the end of the line. Many other C implementations allow
such comments, and they are included in the 1999 C standard. However,
C++ style comments are not recognized if you specify an '-std' option
specifying a version of ISO C before C99, or '-ansi' (equivalent to
'-std=c89').

File: gcc.info, Node: Dollar Signs, Next: Character Escapes, Prev: C++ Comments, Up: C Extensions
5.31 Dollar Signs in Identifier Names
=====================================
In GNU C, you may normally use dollar signs in identifier names. This
is because many traditional C implementations allow such identifiers.
However, dollar signs in identifiers are not supported on a few target
machines, typically because the target assembler does not allow them.

File: gcc.info, Node: Character Escapes, Next: Alignment, Prev: Dollar Signs, Up: C Extensions
5.32 The Character <ESC> in Constants
=====================================
You can use the sequence '\e' in a string or character constant to stand
for the ASCII character <ESC>.

File: gcc.info, Node: Alignment, Next: Variable Attributes, Prev: Character Escapes, Up: C Extensions
5.33 Inquiring on Alignment of Types or Variables
=================================================
The keyword '__alignof__' allows you to inquire about how an object is
aligned, or the minimum alignment usually required by a type. Its
syntax is just like 'sizeof'.
For example, if the target machine requires a 'double' value to be
aligned on an 8-byte boundary, then '__alignof__ (double)' is 8. This
is true on many RISC machines. On more traditional machine designs,
'__alignof__ (double)' is 4 or even 2.
Some machines never actually require alignment; they allow reference to
any data type even at an odd address. For these machines, '__alignof__'
reports the smallest alignment that GCC will give the data type, usually
as mandated by the target ABI.
If the operand of '__alignof__' is an lvalue rather than a type, its
value is the required alignment for its type, taking into account any
minimum alignment specified with GCC's '__attribute__' extension (*note
Variable Attributes::). For example, after this declaration:
struct foo { int x; char y; } foo1;
the value of '__alignof__ (foo1.y)' is 1, even though its actual
alignment is probably 2 or 4, the same as '__alignof__ (int)'.
It is an error to ask for the alignment of an incomplete type.

File: gcc.info, Node: Variable Attributes, Next: Type Attributes, Prev: Alignment, Up: C Extensions
5.34 Specifying Attributes of Variables
=======================================
The keyword '__attribute__' allows you to specify special attributes of
variables or structure fields. This keyword is followed by an attribute
specification inside double parentheses. Some attributes are currently
defined generically for variables. Other attributes are defined for
variables on particular target systems. Other attributes are available
for functions (*note Function Attributes::) and for types (*note Type
Attributes::). Other front ends might define more attributes (*note
Extensions to the C++ Language: C++ Extensions.).
You may also specify attributes with '__' preceding and following each
keyword. This allows you to use them in header files without being
concerned about a possible macro of the same name. For example, you may
use '__aligned__' instead of 'aligned'.
*Note Attribute Syntax::, for details of the exact syntax for using
attributes.
'aligned (ALIGNMENT)'
This attribute specifies a minimum alignment for the variable or
structure field, measured in bytes. For example, the declaration:
int x __attribute__ ((aligned (16))) = 0;
causes the compiler to allocate the global variable 'x' on a
16-byte boundary. On a 68040, this could be used in conjunction
with an 'asm' expression to access the 'move16' instruction which
requires 16-byte aligned operands.
You can also specify the alignment of structure fields. For
example, to create a double-word aligned 'int' pair, you could
write:
struct foo { int x[2] __attribute__ ((aligned (8))); };
This is an alternative to creating a union with a 'double' member
that forces the union to be double-word aligned.
As in the preceding examples, you can explicitly specify the
alignment (in bytes) that you wish the compiler to use for a given
variable or structure field. Alternatively, you can leave out the
alignment factor and just ask the compiler to align a variable or
field to the maximum useful alignment for the target machine you
are compiling for. For example, you could write:
short array[3] __attribute__ ((aligned));
Whenever you leave out the alignment factor in an 'aligned'
attribute specification, the compiler automatically sets the
alignment for the declared variable or field to the largest
alignment which is ever used for any data type on the target
machine you are compiling for. Doing this can often make copy
operations more efficient, because the compiler can use whatever
instructions copy the biggest chunks of memory when performing
copies to or from the variables or fields that you have aligned
this way.
When used on a struct, or struct member, the 'aligned' attribute
can only increase the alignment; in order to decrease it, the
'packed' attribute must be specified as well. When used as part of
a typedef, the 'aligned' attribute can both increase and decrease
alignment, and specifying the 'packed' attribute will generate a
warning.
Note that the effectiveness of 'aligned' attributes may be limited
by inherent limitations in your linker. On many systems, the
linker is only able to arrange for variables to be aligned up to a
certain maximum alignment. (For some linkers, the maximum
supported alignment may be very very small.) If your linker is
only able to align variables up to a maximum of 8 byte alignment,
then specifying 'aligned(16)' in an '__attribute__' will still only
provide you with 8 byte alignment. See your linker documentation
for further information.
The 'aligned' attribute can also be used for functions (*note
Function Attributes::.)
'cleanup (CLEANUP_FUNCTION)'
The 'cleanup' attribute runs a function when the variable goes out
of scope. This attribute can only be applied to auto function
scope variables; it may not be applied to parameters or variables
with static storage duration. The function must take one
parameter, a pointer to a type compatible with the variable. The
return value of the function (if any) is ignored.
If '-fexceptions' is enabled, then CLEANUP_FUNCTION will be run
during the stack unwinding that happens during the processing of
the exception. Note that the 'cleanup' attribute does not allow
the exception to be caught, only to perform an action. It is
undefined what happens if CLEANUP_FUNCTION does not return
normally.
'common'
'nocommon'
The 'common' attribute requests GCC to place a variable in "common"
storage. The 'nocommon' attribute requests the opposite--to
allocate space for it directly.
These attributes override the default chosen by the '-fno-common'
and '-fcommon' flags respectively.
'deprecated'
The 'deprecated' attribute results in a warning if the variable is
used anywhere in the source file. This is useful when identifying
variables that are expected to be removed in a future version of a
program. The warning also includes the location of the declaration
of the deprecated variable, to enable users to easily find further
information about why the variable is deprecated, or what they
should do instead. Note that the warning only occurs for uses:
extern int old_var __attribute__ ((deprecated));
extern int old_var;
int new_fn () { return old_var; }
results in a warning on line 3 but not line 2.
The 'deprecated' attribute can also be used for functions and types
(*note Function Attributes::, *note Type Attributes::.)
'mode (MODE)'
This attribute specifies the data type for the
declaration--whichever type corresponds to the mode MODE. This in
effect lets you request an integer or floating point type according
to its width.
You may also specify a mode of 'byte' or '__byte__' to indicate the
mode corresponding to a one-byte integer, 'word' or '__word__' for
the mode of a one-word integer, and 'pointer' or '__pointer__' for
the mode used to represent pointers.
'packed'
The 'packed' attribute specifies that a variable or structure field
should have the smallest possible alignment--one byte for a
variable, and one bit for a field, unless you specify a larger
value with the 'aligned' attribute.
Here is a structure in which the field 'x' is packed, so that it
immediately follows 'a':
struct foo
{
char a;
int x[2] __attribute__ ((packed));
};
'section ("SECTION-NAME")'
Normally, the compiler places the objects it generates in sections
like 'data' and 'bss'. Sometimes, however, you need additional
sections, or you need certain particular variables to appear in
special sections, for example to map to special hardware. The
'section' attribute specifies that a variable (or function) lives
in a particular section. For example, this small program uses
several specific section names:
struct duart a __attribute__ ((section ("DUART_A"))) = { 0 };
struct duart b __attribute__ ((section ("DUART_B"))) = { 0 };
char stack[10000] __attribute__ ((section ("STACK"))) = { 0 };
int init_data __attribute__ ((section ("INITDATA"))) = 0;
main()
{
/* Initialize stack pointer */
init_sp (stack + sizeof (stack));
/* Initialize initialized data */
memcpy (&init_data, &data, &edata - &data);
/* Turn on the serial ports */
init_duart (&a);
init_duart (&b);
}
Use the 'section' attribute with an _initialized_ definition of a
_global_ variable, as shown in the example. GCC issues a warning
and otherwise ignores the 'section' attribute in uninitialized
variable declarations.
You may only use the 'section' attribute with a fully initialized
global definition because of the way linkers work. The linker
requires each object be defined once, with the exception that
uninitialized variables tentatively go in the 'common' (or 'bss')
section and can be multiply "defined". You can force a variable to
be initialized with the '-fno-common' flag or the 'nocommon'
attribute.
Some file formats do not support arbitrary sections so the
'section' attribute is not available on all platforms. If you need
to map the entire contents of a module to a particular section,
consider using the facilities of the linker instead.
'shared'
On Microsoft Windows, in addition to putting variable definitions
in a named section, the section can also be shared among all
running copies of an executable or DLL. For example, this small
program defines shared data by putting it in a named section
'shared' and marking the section shareable:
int foo __attribute__((section ("shared"), shared)) = 0;
int
main()
{
/* Read and write foo. All running
copies see the same value. */
return 0;
}
You may only use the 'shared' attribute along with 'section'
attribute with a fully initialized global definition because of the
way linkers work. See 'section' attribute for more information.
The 'shared' attribute is only available on Microsoft Windows.
'tls_model ("TLS_MODEL")'
The 'tls_model' attribute sets thread-local storage model (*note
Thread-Local::) of a particular '__thread' variable, overriding
'-ftls-model=' command line switch on a per-variable basis. The
TLS_MODEL argument should be one of 'global-dynamic',
'local-dynamic', 'initial-exec' or 'local-exec'.
Not all targets support this attribute.
'unused'
This attribute, attached to a variable, means that the variable is
meant to be possibly unused. GCC will not produce a warning for
this variable.
'used'
This attribute, attached to a variable, means that the variable
must be emitted even if it appears that the variable is not
referenced.
'vector_size (BYTES)'
This attribute specifies the vector size for the variable, measured
in bytes. For example, the declaration:
int foo __attribute__ ((vector_size (16)));
causes the compiler to set the mode for 'foo', to be 16 bytes,
divided into 'int' sized units. Assuming a 32-bit int (a vector of
4 units of 4 bytes), the corresponding mode of 'foo' will be V4SI.
This attribute is only applicable to integral and float scalars,
although arrays, pointers, and function return values are allowed
in conjunction with this construct.
Aggregates with this attribute are invalid, even if they are of the
same size as a corresponding scalar. For example, the declaration:
struct S { int a; };
struct S __attribute__ ((vector_size (16))) foo;
is invalid even if the size of the structure is the same as the
size of the 'int'.
'selectany'
The 'selectany' attribute causes an initialized global variable to
have link-once semantics. When multiple definitions of the
variable are encountered by the linker, the first is selected and
the remainder are discarded. Following usage by the Microsoft
compiler, the linker is told _not_ to warn about size or content
differences of the multiple definitions.
Although the primary usage of this attribute is for POD types, the
attribute can also be applied to global C++ objects that are
initialized by a constructor. In this case, the static
initialization and destruction code for the object is emitted in
each translation defining the object, but the calls to the
constructor and destructor are protected by a link-once guard
variable.
The 'selectany' attribute is only available on Microsoft Windows
targets. You can use '__declspec (selectany)' as a synonym for
'__attribute__ ((selectany))' for compatibility with other
compilers.
'weak'
The 'weak' attribute is described in *Note Function Attributes::.
'dllimport'
The 'dllimport' attribute is described in *Note Function
Attributes::.
'dllexport'
The 'dllexport' attribute is described in *Note Function
Attributes::.
5.34.1 Blackfin Variable Attributes
-----------------------------------
Three attributes are currently defined for the Blackfin.
'l1_data'
'l1_data_A'
'l1_data_B'
Use these attributes on the Blackfin to place the variable into L1
Data SRAM. Variables with 'l1_data' attribute will be put into the
specific section named '.l1.data'. Those with 'l1_data_A'
attribute will be put into the specific section named '.l1.data.A'.
Those with 'l1_data_B' attribute will be put into the specific
section named '.l1.data.B'.
5.34.2 M32R/D Variable Attributes
---------------------------------
One attribute is currently defined for the M32R/D.
'model (MODEL-NAME)'
Use this attribute on the M32R/D to set the addressability of an
object. The identifier MODEL-NAME is one of 'small', 'medium', or
'large', representing each of the code models.
Small model objects live in the lower 16MB of memory (so that their
addresses can be loaded with the 'ld24' instruction).
Medium and large model objects may live anywhere in the 32-bit
address space (the compiler will generate 'seth/add3' instructions
to load their addresses).
5.34.3 i386 Variable Attributes
-------------------------------
Two attributes are currently defined for i386 configurations:
'ms_struct' and 'gcc_struct'
'ms_struct'
'gcc_struct'
If 'packed' is used on a structure, or if bit-fields are used it
may be that the Microsoft ABI packs them differently than GCC would
normally pack them. Particularly when moving packed data between
functions compiled with GCC and the native Microsoft compiler
(either via function call or as data in a file), it may be
necessary to access either format.
Currently '-m[no-]ms-bitfields' is provided for the Microsoft
Windows X86 compilers to match the native Microsoft compiler.
The Microsoft structure layout algorithm is fairly simple with the
exception of the bitfield packing:
The padding and alignment of members of structures and whether a
bit field can straddle a storage-unit boundary
1. Structure members are stored sequentially in the order in
which they are declared: the first member has the lowest
memory address and the last member the highest.
2. Every data object has an alignment-requirement. The
alignment-requirement for all data except structures, unions,
and arrays is either the size of the object or the current
packing size (specified with either the aligned attribute or
the pack pragma), whichever is less. For structures, unions,
and arrays, the alignment-requirement is the largest
alignment-requirement of its members. Every object is
allocated an offset so that:
offset % alignment-requirement == 0
3. Adjacent bit fields are packed into the same 1-, 2-, or 4-byte
allocation unit if the integral types are the same size and if
the next bit field fits into the current allocation unit
without crossing the boundary imposed by the common alignment
requirements of the bit fields.
Handling of zero-length bitfields:
MSVC interprets zero-length bitfields in the following ways:
1. If a zero-length bitfield is inserted between two bitfields
that would normally be coalesced, the bitfields will not be
coalesced.
For example:
struct
{
unsigned long bf_1 : 12;
unsigned long : 0;
unsigned long bf_2 : 12;
} t1;
The size of 't1' would be 8 bytes with the zero-length
bitfield. If the zero-length bitfield were removed, 't1''s
size would be 4 bytes.
2. If a zero-length bitfield is inserted after a bitfield, 'foo',
and the alignment of the zero-length bitfield is greater than
the member that follows it, 'bar', 'bar' will be aligned as
the type of the zero-length bitfield.
For example:
struct
{
char foo : 4;
short : 0;
char bar;
} t2;
struct
{
char foo : 4;
short : 0;
double bar;
} t3;
For 't2', 'bar' will be placed at offset 2, rather than offset
1. Accordingly, the size of 't2' will be 4. For 't3', the
zero-length bitfield will not affect the alignment of 'bar'
or, as a result, the size of the structure.
Taking this into account, it is important to note the
following:
1. If a zero-length bitfield follows a normal bitfield, the
type of the zero-length bitfield may affect the alignment
of the structure as whole. For example, 't2' has a size
of 4 bytes, since the zero-length bitfield follows a
normal bitfield, and is of type short.
2. Even if a zero-length bitfield is not followed by a
normal bitfield, it may still affect the alignment of the
structure:
struct
{
char foo : 6;
long : 0;
} t4;
Here, 't4' will take up 4 bytes.
3. Zero-length bitfields following non-bitfield members are
ignored:
struct
{
char foo;
long : 0;
char bar;
} t5;
Here, 't5' will take up 2 bytes.
5.34.4 PowerPC Variable Attributes
----------------------------------
Three attributes currently are defined for PowerPC configurations:
'altivec', 'ms_struct' and 'gcc_struct'.
For full documentation of the struct attributes please see the
documentation in the *Note i386 Variable Attributes::, section.
For documentation of 'altivec' attribute please see the documentation
in the *Note PowerPC Type Attributes::, section.
5.34.5 SPU Variable Attributes
------------------------------
The SPU supports the 'spu_vector' attribute for variables. For
documentation of this attribute please see the documentation in the
*Note SPU Type Attributes::, section.
5.34.6 Xstormy16 Variable Attributes
------------------------------------
One attribute is currently defined for xstormy16 configurations:
'below100'
'below100'
If a variable has the 'below100' attribute ('BELOW100' is allowed
also), GCC will place the variable in the first 0x100 bytes of
memory and use special opcodes to access it. Such variables will
be placed in either the '.bss_below100' section or the
'.data_below100' section.
5.34.7 AVR Variable Attributes
------------------------------
'progmem'
The 'progmem' attribute is used on the AVR to place data in the
Program Memory address space. The AVR is a Harvard Architecture
processor and data normally resides in the Data Memory address
space.

File: gcc.info, Node: Type Attributes, Next: Inline, Prev: Variable Attributes, Up: C Extensions
5.35 Specifying Attributes of Types
===================================
The keyword '__attribute__' allows you to specify special attributes of
'struct' and 'union' types when you define such types. This keyword is
followed by an attribute specification inside double parentheses. Seven
attributes are currently defined for types: 'aligned', 'packed',
'transparent_union', 'unused', 'deprecated', 'visibility', and
'may_alias'. Other attributes are defined for functions (*note Function
Attributes::) and for variables (*note Variable Attributes::).
You may also specify any one of these attributes with '__' preceding
and following its keyword. This allows you to use these attributes in
header files without being concerned about a possible macro of the same
name. For example, you may use '__aligned__' instead of 'aligned'.
You may specify type attributes in an enum, struct or union type
declaration or definition, or for other types in a 'typedef'
declaration.
For an enum, struct or union type, you may specify attributes either
between the enum, struct or union tag and the name of the type, or just
past the closing curly brace of the _definition_. The former syntax is
preferred.
*Note Attribute Syntax::, for details of the exact syntax for using
attributes.
'aligned (ALIGNMENT)'
This attribute specifies a minimum alignment (in bytes) for
variables of the specified type. For example, the declarations:
struct S { short f[3]; } __attribute__ ((aligned (8)));
typedef int more_aligned_int __attribute__ ((aligned (8)));
force the compiler to insure (as far as it can) that each variable
whose type is 'struct S' or 'more_aligned_int' will be allocated
and aligned _at least_ on a 8-byte boundary. On a SPARC, having
all variables of type 'struct S' aligned to 8-byte boundaries
allows the compiler to use the 'ldd' and 'std' (doubleword load and
store) instructions when copying one variable of type 'struct S' to
another, thus improving run-time efficiency.
Note that the alignment of any given 'struct' or 'union' type is
required by the ISO C standard to be at least a perfect multiple of
the lowest common multiple of the alignments of all of the members
of the 'struct' or 'union' in question. This means that you _can_
effectively adjust the alignment of a 'struct' or 'union' type by
attaching an 'aligned' attribute to any one of the members of such
a type, but the notation illustrated in the example above is a more
obvious, intuitive, and readable way to request the compiler to
adjust the alignment of an entire 'struct' or 'union' type.
As in the preceding example, you can explicitly specify the
alignment (in bytes) that you wish the compiler to use for a given
'struct' or 'union' type. Alternatively, you can leave out the
alignment factor and just ask the compiler to align a type to the
maximum useful alignment for the target machine you are compiling
for. For example, you could write:
struct S { short f[3]; } __attribute__ ((aligned));
Whenever you leave out the alignment factor in an 'aligned'
attribute specification, the compiler automatically sets the
alignment for the type to the largest alignment which is ever used
for any data type on the target machine you are compiling for.
Doing this can often make copy operations more efficient, because
the compiler can use whatever instructions copy the biggest chunks
of memory when performing copies to or from the variables which
have types that you have aligned this way.
In the example above, if the size of each 'short' is 2 bytes, then
the size of the entire 'struct S' type is 6 bytes. The smallest
power of two which is greater than or equal to that is 8, so the
compiler sets the alignment for the entire 'struct S' type to 8
bytes.
Note that although you can ask the compiler to select a
time-efficient alignment for a given type and then declare only
individual stand-alone objects of that type, the compiler's ability
to select a time-efficient alignment is primarily useful only when
you plan to create arrays of variables having the relevant
(efficiently aligned) type. If you declare or use arrays of
variables of an efficiently-aligned type, then it is likely that
your program will also be doing pointer arithmetic (or
subscripting, which amounts to the same thing) on pointers to the
relevant type, and the code that the compiler generates for these
pointer arithmetic operations will often be more efficient for
efficiently-aligned types than for other types.
The 'aligned' attribute can only increase the alignment; but you
can decrease it by specifying 'packed' as well. See below.
Note that the effectiveness of 'aligned' attributes may be limited
by inherent limitations in your linker. On many systems, the
linker is only able to arrange for variables to be aligned up to a
certain maximum alignment. (For some linkers, the maximum
supported alignment may be very very small.) If your linker is
only able to align variables up to a maximum of 8 byte alignment,
then specifying 'aligned(16)' in an '__attribute__' will still only
provide you with 8 byte alignment. See your linker documentation
for further information.
'packed'
This attribute, attached to 'struct' or 'union' type definition,
specifies that each member (other than zero-width bitfields) of the
structure or union is placed to minimize the memory required. When
attached to an 'enum' definition, it indicates that the smallest
integral type should be used.
Specifying this attribute for 'struct' and 'union' types is
equivalent to specifying the 'packed' attribute on each of the
structure or union members. Specifying the '-fshort-enums' flag on
the line is equivalent to specifying the 'packed' attribute on all
'enum' definitions.
In the following example 'struct my_packed_struct''s members are
packed closely together, but the internal layout of its 's' member
is not packed--to do that, 'struct my_unpacked_struct' would need
to be packed too.
struct my_unpacked_struct
{
char c;
int i;
};
struct __attribute__ ((__packed__)) my_packed_struct
{
char c;
int i;
struct my_unpacked_struct s;
};
You may only specify this attribute on the definition of a 'enum',
'struct' or 'union', not on a 'typedef' which does not also define
the enumerated type, structure or union.
'transparent_union'
This attribute, attached to a 'union' type definition, indicates
that any function parameter having that union type causes calls to
that function to be treated in a special way.
First, the argument corresponding to a transparent union type can
be of any type in the union; no cast is required. Also, if the
union contains a pointer type, the corresponding argument can be a
null pointer constant or a void pointer expression; and if the
union contains a void pointer type, the corresponding argument can
be any pointer expression. If the union member type is a pointer,
qualifiers like 'const' on the referenced type must be respected,
just as with normal pointer conversions.
Second, the argument is passed to the function using the calling
conventions of the first member of the transparent union, not the
calling conventions of the union itself. All members of the union
must have the same machine representation; this is necessary for
this argument passing to work properly.
Transparent unions are designed for library functions that have
multiple interfaces for compatibility reasons. For example,
suppose the 'wait' function must accept either a value of type 'int
*' to comply with Posix, or a value of type 'union wait *' to
comply with the 4.1BSD interface. If 'wait''s parameter were 'void
*', 'wait' would accept both kinds of arguments, but it would also
accept any other pointer type and this would make argument type
checking less useful. Instead, '<sys/wait.h>' might define the
interface as follows:
typedef union __attribute__ ((__transparent_union__))
{
int *__ip;
union wait *__up;
} wait_status_ptr_t;
pid_t wait (wait_status_ptr_t);
This interface allows either 'int *' or 'union wait *' arguments to
be passed, using the 'int *' calling convention. The program can
call 'wait' with arguments of either type:
int w1 () { int w; return wait (&w); }
int w2 () { union wait w; return wait (&w); }
With this interface, 'wait''s implementation might look like this:
pid_t wait (wait_status_ptr_t p)
{
return waitpid (-1, p.__ip, 0);
}
'unused'
When attached to a type (including a 'union' or a 'struct'), this
attribute means that variables of that type are meant to appear
possibly unused. GCC will not produce a warning for any variables
of that type, even if the variable appears to do nothing. This is
often the case with lock or thread classes, which are usually
defined and then not referenced, but contain constructors and
destructors that have nontrivial bookkeeping functions.
'deprecated'
The 'deprecated' attribute results in a warning if the type is used
anywhere in the source file. This is useful when identifying types
that are expected to be removed in a future version of a program.
If possible, the warning also includes the location of the
declaration of the deprecated type, to enable users to easily find
further information about why the type is deprecated, or what they
should do instead. Note that the warnings only occur for uses and
then only if the type is being applied to an identifier that itself
is not being declared as deprecated.
typedef int T1 __attribute__ ((deprecated));
T1 x;
typedef T1 T2;
T2 y;
typedef T1 T3 __attribute__ ((deprecated));
T3 z __attribute__ ((deprecated));
results in a warning on line 2 and 3 but not lines 4, 5, or 6. No
warning is issued for line 4 because T2 is not explicitly
deprecated. Line 5 has no warning because T3 is explicitly
deprecated. Similarly for line 6.
The 'deprecated' attribute can also be used for functions and
variables (*note Function Attributes::, *note Variable
Attributes::.)
'may_alias'
Accesses through pointers to types with this attribute are not
subject to type-based alias analysis, but are instead assumed to be
able to alias any other type of objects. In the context of 6.5/7
an lvalue expression dereferencing such a pointer is treated like
having a character type. See '-fstrict-aliasing' for more
information on aliasing issues. This extension exists to support
some vector APIs, in which pointers to one vector type are
permitted to alias pointers to a different vector type.
Note that an object of a type with this attribute does not have any
special semantics.
Example of use:
typedef short __attribute__((__may_alias__)) short_a;
int
main (void)
{
int a = 0x12345678;
short_a *b = (short_a *) &a;
b[1] = 0;
if (a == 0x12345678)
abort();
exit(0);
}
If you replaced 'short_a' with 'short' in the variable declaration,
the above program would abort when compiled with
'-fstrict-aliasing', which is on by default at '-O2' or above in
recent GCC versions.
'visibility'
In C++, attribute visibility (*note Function Attributes::) can also
be applied to class, struct, union and enum types. Unlike other
type attributes, the attribute must appear between the initial
keyword and the name of the type; it cannot appear after the body
of the type.
Note that the type visibility is applied to vague linkage entities
associated with the class (vtable, typeinfo node, etc.). In
particular, if a class is thrown as an exception in one shared
object and caught in another, the class must have default
visibility. Otherwise the two shared objects will be unable to use
the same typeinfo node and exception handling will break.
subsection ARM Type Attributes
On those ARM targets that support 'dllimport' (such as Symbian OS),
you can use the 'notshared' attribute to indicate that the virtual
table and other similar data for a class should not be exported
from a DLL. For example:
class __declspec(notshared) C {
public:
__declspec(dllimport) C();
virtual void f();
}
__declspec(dllexport)
C::C() {}
In this code, 'C::C' is exported from the current DLL, but the
virtual table for 'C' is not exported. (You can use
'__attribute__' instead of '__declspec' if you prefer, but most
Symbian OS code uses '__declspec'.)
subsection i386 Type Attributes
Two attributes are currently defined for i386 configurations:
'ms_struct' and 'gcc_struct'
'ms_struct'
'gcc_struct'
If 'packed' is used on a structure, or if bit-fields are used it
may be that the Microsoft ABI packs them differently than GCC would
normally pack them. Particularly when moving packed data between
functions compiled with GCC and the native Microsoft compiler
(either via function call or as data in a file), it may be
necessary to access either format.
Currently '-m[no-]ms-bitfields' is provided for the Microsoft
Windows X86 compilers to match the native Microsoft compiler.
To specify multiple attributes, separate them by commas within the
double parentheses: for example, '__attribute__ ((aligned (16),
packed))'.
5.35.1 PowerPC Type Attributes
------------------------------
Three attributes currently are defined for PowerPC configurations:
'altivec', 'ms_struct' and 'gcc_struct'.
For full documentation of the struct attributes please see the
documentation in the *Note i386 Type Attributes::, section.
The 'altivec' attribute allows one to declare AltiVec vector data types
supported by the AltiVec Programming Interface Manual. The attribute
requires an argument to specify one of three vector types: 'vector__',
'pixel__' (always followed by unsigned short), and 'bool__' (always
followed by unsigned).
__attribute__((altivec(vector__)))
__attribute__((altivec(pixel__))) unsigned short
__attribute__((altivec(bool__))) unsigned
These attributes mainly are intended to support the '__vector',
'__pixel', and '__bool' AltiVec keywords.
5.35.2 SPU Type Attributes
--------------------------
The SPU supports the 'spu_vector' attribute for types. This attribute
allows one to declare vector data types supported by the
Sony/Toshiba/IBM SPU Language Extensions Specification. It is intended
to support the '__vector' keyword.

File: gcc.info, Node: Inline, Next: Extended Asm, Prev: Type Attributes, Up: C Extensions
5.36 An Inline Function is As Fast As a Macro
=============================================
By declaring a function inline, you can direct GCC to make calls to that
function faster. One way GCC can achieve this is to integrate that
function's code into the code for its callers. This makes execution
faster by eliminating the function-call overhead; in addition, if any of
the actual argument values are constant, their known values may permit
simplifications at compile time so that not all of the inline function's
code needs to be included. The effect on code size is less predictable;
object code may be larger or smaller with function inlining, depending
on the particular case. You can also direct GCC to try to integrate all
"simple enough" functions into their callers with the option
'-finline-functions'.
GCC implements three different semantics of declaring a function
inline. One is available with '-std=gnu89' or '-fgnu89-inline' or when
'gnu_inline' attribute is present on all inline declarations, another
when '-std=c99' or '-std=gnu99' (without '-fgnu89-inline'), and the
third is used when compiling C++.
To declare a function inline, use the 'inline' keyword in its
declaration, like this:
static inline int
inc (int *a)
{
(*a)++;
}
If you are writing a header file to be included in ISO C89 programs,
write '__inline__' instead of 'inline'. *Note Alternate Keywords::.
The three types of inlining behave similarly in two important cases:
when the 'inline' keyword is used on a 'static' function, like the
example above, and when a function is first declared without using the
'inline' keyword and then is defined with 'inline', like this:
extern int inc (int *a);
inline int
inc (int *a)
{
(*a)++;
}
In both of these common cases, the program behaves the same as if you
had not used the 'inline' keyword, except for its speed.
When a function is both inline and 'static', if all calls to the
function are integrated into the caller, and the function's address is
never used, then the function's own assembler code is never referenced.
In this case, GCC does not actually output assembler code for the
function, unless you specify the option '-fkeep-inline-functions'. Some
calls cannot be integrated for various reasons (in particular, calls
that precede the function's definition cannot be integrated, and neither
can recursive calls within the definition). If there is a nonintegrated
call, then the function is compiled to assembler code as usual. The
function must also be compiled as usual if the program refers to its
address, because that can't be inlined.
Note that certain usages in a function definition can make it
unsuitable for inline substitution. Among these usages are: use of
varargs, use of alloca, use of variable sized data types (*note Variable
Length::), use of computed goto (*note Labels as Values::), use of
nonlocal goto, and nested functions (*note Nested Functions::). Using
'-Winline' will warn when a function marked 'inline' could not be
substituted, and will give the reason for the failure.
As required by ISO C++, GCC considers member functions defined within
the body of a class to be marked inline even if they are not explicitly
declared with the 'inline' keyword. You can override this with
'-fno-default-inline'; *note Options Controlling C++ Dialect: C++
Dialect Options.
GCC does not inline any functions when not optimizing unless you
specify the 'always_inline' attribute for the function, like this:
/* Prototype. */
inline void foo (const char) __attribute__((always_inline));
The remainder of this section is specific to GNU C89 inlining.
When an inline function is not 'static', then the compiler must assume
that there may be calls from other source files; since a global symbol
can be defined only once in any program, the function must not be
defined in the other source files, so the calls therein cannot be
integrated. Therefore, a non-'static' inline function is always
compiled on its own in the usual fashion.
If you specify both 'inline' and 'extern' in the function definition,
then the definition is used only for inlining. In no case is the
function compiled on its own, not even if you refer to its address
explicitly. Such an address becomes an external reference, as if you
had only declared the function, and had not defined it.
This combination of 'inline' and 'extern' has almost the effect of a
macro. The way to use it is to put a function definition in a header
file with these keywords, and put another copy of the definition
(lacking 'inline' and 'extern') in a library file. The definition in
the header file will cause most calls to the function to be inlined. If
any uses of the function remain, they will refer to the single copy in
the library.

File: gcc.info, Node: Extended Asm, Next: Constraints, Prev: Inline, Up: C Extensions
5.37 Assembler Instructions with C Expression Operands
======================================================
In an assembler instruction using 'asm', you can specify the operands of
the instruction using C expressions. This means you need not guess
which registers or memory locations will contain the data you want to
use.
You must specify an assembler instruction template much like what
appears in a machine description, plus an operand constraint string for
each operand.
For example, here is how to use the 68881's 'fsinx' instruction:
asm ("fsinx %1,%0" : "=f" (result) : "f" (angle));
Here 'angle' is the C expression for the input operand while 'result' is
that of the output operand. Each has '"f"' as its operand constraint,
saying that a floating point register is required. The '=' in '=f'
indicates that the operand is an output; all output operands'
constraints must use '='. The constraints use the same language used in
the machine description (*note Constraints::).
Each operand is described by an operand-constraint string followed by
the C expression in parentheses. A colon separates the assembler
template from the first output operand and another separates the last
output operand from the first input, if any. Commas separate the
operands within each group. The total number of operands is currently
limited to 30; this limitation may be lifted in some future version of
GCC.
If there are no output operands but there are input operands, you must
place two consecutive colons surrounding the place where the output
operands would go.
As of GCC version 3.1, it is also possible to specify input and output
operands using symbolic names which can be referenced within the
assembler code. These names are specified inside square brackets
preceding the constraint string, and can be referenced inside the
assembler code using '%[NAME]' instead of a percentage sign followed by
the operand number. Using named operands the above example could look
like:
asm ("fsinx %[angle],%[output]"
: [output] "=f" (result)
: [angle] "f" (angle));
Note that the symbolic operand names have no relation whatsoever to
other C identifiers. You may use any name you like, even those of
existing C symbols, but you must ensure that no two operands within the
same assembler construct use the same symbolic name.
Output operand expressions must be lvalues; the compiler can check
this. The input operands need not be lvalues. The compiler cannot
check whether the operands have data types that are reasonable for the
instruction being executed. It does not parse the assembler instruction
template and does not know what it means or even whether it is valid
assembler input. The extended 'asm' feature is most often used for
machine instructions the compiler itself does not know exist. If the
output expression cannot be directly addressed (for example, it is a
bit-field), your constraint must allow a register. In that case, GCC
will use the register as the output of the 'asm', and then store that
register into the output.
The ordinary output operands must be write-only; GCC will assume that
the values in these operands before the instruction are dead and need
not be generated. Extended asm supports input-output or read-write
operands. Use the constraint character '+' to indicate such an operand
and list it with the output operands. You should only use read-write
operands when the constraints for the operand (or the operand in which
only some of the bits are to be changed) allow a register.
You may, as an alternative, logically split its function into two
separate operands, one input operand and one write-only output operand.
The connection between them is expressed by constraints which say they
need to be in the same location when the instruction executes. You can
use the same C expression for both operands, or different expressions.
For example, here we write the (fictitious) 'combine' instruction with
'bar' as its read-only source operand and 'foo' as its read-write
destination:
asm ("combine %2,%0" : "=r" (foo) : "0" (foo), "g" (bar));
The constraint '"0"' for operand 1 says that it must occupy the same
location as operand 0. A number in constraint is allowed only in an
input operand and it must refer to an output operand.
Only a number in the constraint can guarantee that one operand will be
in the same place as another. The mere fact that 'foo' is the value of
both operands is not enough to guarantee that they will be in the same
place in the generated assembler code. The following would not work
reliably:
asm ("combine %2,%0" : "=r" (foo) : "r" (foo), "g" (bar));
Various optimizations or reloading could cause operands 0 and 1 to be
in different registers; GCC knows no reason not to do so. For example,
the compiler might find a copy of the value of 'foo' in one register and
use it for operand 1, but generate the output operand 0 in a different
register (copying it afterward to 'foo''s own address). Of course,
since the register for operand 1 is not even mentioned in the assembler
code, the result will not work, but GCC can't tell that.
As of GCC version 3.1, one may write '[NAME]' instead of the operand
number for a matching constraint. For example:
asm ("cmoveq %1,%2,%[result]"
: [result] "=r"(result)
: "r" (test), "r"(new), "[result]"(old));
Sometimes you need to make an 'asm' operand be a specific register, but
there's no matching constraint letter for that register _by itself_. To
force the operand into that register, use a local variable for the
operand and specify the register in the variable declaration. *Note
Explicit Reg Vars::. Then for the 'asm' operand, use any register
constraint letter that matches the register:
register int *p1 asm ("r0") = ...;
register int *p2 asm ("r1") = ...;
register int *result asm ("r0");
asm ("sysint" : "=r" (result) : "0" (p1), "r" (p2));
In the above example, beware that a register that is call-clobbered by
the target ABI will be overwritten by any function call in the
assignment, including library calls for arithmetic operators. Assuming
it is a call-clobbered register, this may happen to 'r0' above by the
assignment to 'p2'. If you have to use such a register, use temporary
variables for expressions between the register assignment and use:
int t1 = ...;
register int *p1 asm ("r0") = ...;
register int *p2 asm ("r1") = t1;
register int *result asm ("r0");
asm ("sysint" : "=r" (result) : "0" (p1), "r" (p2));
Some instructions clobber specific hard registers. To describe this,
write a third colon after the input operands, followed by the names of
the clobbered hard registers (given as strings). Here is a realistic
example for the VAX:
asm volatile ("movc3 %0,%1,%2"
: /* no outputs */
: "g" (from), "g" (to), "g" (count)
: "r0", "r1", "r2", "r3", "r4", "r5");
You may not write a clobber description in a way that overlaps with an
input or output operand. For example, you may not have an operand
describing a register class with one member if you mention that register
in the clobber list. Variables declared to live in specific registers
(*note Explicit Reg Vars::), and used as asm input or output operands
must have no part mentioned in the clobber description. There is no way
for you to specify that an input operand is modified without also
specifying it as an output operand. Note that if all the output
operands you specify are for this purpose (and hence unused), you will
then also need to specify 'volatile' for the 'asm' construct, as
described below, to prevent GCC from deleting the 'asm' statement as
unused.
If you refer to a particular hardware register from the assembler code,
you will probably have to list the register after the third colon to
tell the compiler the register's value is modified. In some assemblers,
the register names begin with '%'; to produce one '%' in the assembler
code, you must write '%%' in the input.
If your assembler instruction can alter the condition code register,
add 'cc' to the list of clobbered registers. GCC on some machines
represents the condition codes as a specific hardware register; 'cc'
serves to name this register. On other machines, the condition code is
handled differently, and specifying 'cc' has no effect. But it is valid
no matter what the machine.
If your assembler instructions access memory in an unpredictable
fashion, add 'memory' to the list of clobbered registers. This will
cause GCC to not keep memory values cached in registers across the
assembler instruction and not optimize stores or loads to that memory.
You will also want to add the 'volatile' keyword if the memory affected
is not listed in the inputs or outputs of the 'asm', as the 'memory'
clobber does not count as a side-effect of the 'asm'. If you know how
large the accessed memory is, you can add it as input or output but if
this is not known, you should add 'memory'. As an example, if you
access ten bytes of a string, you can use a memory input like:
{"m"( ({ struct { char x[10]; } *p = (void *)ptr ; *p; }) )}.
Note that in the following example the memory input is necessary,
otherwise GCC might optimize the store to 'x' away:
int foo ()
{
int x = 42;
int *y = &x;
int result;
asm ("magic stuff accessing an 'int' pointed to by '%1'"
"=&d" (r) : "a" (y), "m" (*y));
return result;
}
You can put multiple assembler instructions together in a single 'asm'
template, separated by the characters normally used in assembly code for
the system. A combination that works in most places is a newline to
break the line, plus a tab character to move to the instruction field
(written as '\n\t'). Sometimes semicolons can be used, if the assembler
allows semicolons as a line-breaking character. Note that some
assembler dialects use semicolons to start a comment. The input
operands are guaranteed not to use any of the clobbered registers, and
neither will the output operands' addresses, so you can read and write
the clobbered registers as many times as you like. Here is an example
of multiple instructions in a template; it assumes the subroutine '_foo'
accepts arguments in registers 9 and 10:
asm ("movl %0,r9\n\tmovl %1,r10\n\tcall _foo"
: /* no outputs */
: "g" (from), "g" (to)
: "r9", "r10");
Unless an output operand has the '&' constraint modifier, GCC may
allocate it in the same register as an unrelated input operand, on the
assumption the inputs are consumed before the outputs are produced.
This assumption may be false if the assembler code actually consists of
more than one instruction. In such a case, use '&' for each output
operand that may not overlap an input. *Note Modifiers::.
If you want to test the condition code produced by an assembler
instruction, you must include a branch and a label in the 'asm'
construct, as follows:
asm ("clr %0\n\tfrob %1\n\tbeq 0f\n\tmov #1,%0\n0:"
: "g" (result)
: "g" (input));
This assumes your assembler supports local labels, as the GNU assembler
and most Unix assemblers do.
Speaking of labels, jumps from one 'asm' to another are not supported.
The compiler's optimizers do not know about these jumps, and therefore
they cannot take account of them when deciding how to optimize.
Usually the most convenient way to use these 'asm' instructions is to
encapsulate them in macros that look like functions. For example,
#define sin(x) \
({ double __value, __arg = (x); \
asm ("fsinx %1,%0": "=f" (__value): "f" (__arg)); \
__value; })
Here the variable '__arg' is used to make sure that the instruction
operates on a proper 'double' value, and to accept only those arguments
'x' which can convert automatically to a 'double'.
Another way to make sure the instruction operates on the correct data
type is to use a cast in the 'asm'. This is different from using a
variable '__arg' in that it converts more different types. For example,
if the desired type were 'int', casting the argument to 'int' would
accept a pointer with no complaint, while assigning the argument to an
'int' variable named '__arg' would warn about using a pointer unless the
caller explicitly casts it.
If an 'asm' has output operands, GCC assumes for optimization purposes
the instruction has no side effects except to change the output
operands. This does not mean instructions with a side effect cannot be
used, but you must be careful, because the compiler may eliminate them
if the output operands aren't used, or move them out of loops, or
replace two with one if they constitute a common subexpression. Also,
if your instruction does have a side effect on a variable that otherwise
appears not to change, the old value of the variable may be reused later
if it happens to be found in a register.
You can prevent an 'asm' instruction from being deleted by writing the
keyword 'volatile' after the 'asm'. For example:
#define get_and_set_priority(new) \
({ int __old; \
asm volatile ("get_and_set_priority %0, %1" \
: "=g" (__old) : "g" (new)); \
__old; })
The 'volatile' keyword indicates that the instruction has important
side-effects. GCC will not delete a volatile 'asm' if it is reachable.
(The instruction can still be deleted if GCC can prove that control-flow
will never reach the location of the instruction.) Note that even a
volatile 'asm' instruction can be moved relative to other code,
including across jump instructions. For example, on many targets there
is a system register which can be set to control the rounding mode of
floating point operations. You might try setting it with a volatile
'asm', like this PowerPC example:
asm volatile("mtfsf 255,%0" : : "f" (fpenv));
sum = x + y;
This will not work reliably, as the compiler may move the addition back
before the volatile 'asm'. To make it work you need to add an
artificial dependency to the 'asm' referencing a variable in the code
you don't want moved, for example:
asm volatile ("mtfsf 255,%1" : "=X"(sum): "f"(fpenv));
sum = x + y;
Similarly, you can't expect a sequence of volatile 'asm' instructions
to remain perfectly consecutive. If you want consecutive output, use a
single 'asm'. Also, GCC will perform some optimizations across a
volatile 'asm' instruction; GCC does not "forget everything" when it
encounters a volatile 'asm' instruction the way some other compilers do.
An 'asm' instruction without any output operands will be treated
identically to a volatile 'asm' instruction.
It is a natural idea to look for a way to give access to the condition
code left by the assembler instruction. However, when we attempted to
implement this, we found no way to make it work reliably. The problem
is that output operands might need reloading, which would result in
additional following "store" instructions. On most machines, these
instructions would alter the condition code before there was time to
test it. This problem doesn't arise for ordinary "test" and "compare"
instructions because they don't have any output operands.
For reasons similar to those described above, it is not possible to
give an assembler instruction access to the condition code left by
previous instructions.
If you are writing a header file that should be includable in ISO C
programs, write '__asm__' instead of 'asm'. *Note Alternate Keywords::.
5.37.1 Size of an 'asm'
-----------------------
Some targets require that GCC track the size of each instruction used in
order to generate correct code. Because the final length of an 'asm' is
only known by the assembler, GCC must make an estimate as to how big it
will be. The estimate is formed by counting the number of statements in
the pattern of the 'asm' and multiplying that by the length of the
longest instruction on that processor. Statements in the 'asm' are
identified by newline characters and whatever statement separator
characters are supported by the assembler; on most processors this is
the '';'' character.
Normally, GCC's estimate is perfectly adequate to ensure that correct
code is generated, but it is possible to confuse the compiler if you use
pseudo instructions or assembler macros that expand into multiple real
instructions or if you use assembler directives that expand to more
space in the object file than would be needed for a single instruction.
If this happens then the assembler will produce a diagnostic saying that
a label is unreachable.
5.37.2 i386 floating point asm operands
---------------------------------------
There are several rules on the usage of stack-like regs in asm_operands
insns. These rules apply only to the operands that are stack-like regs:
1. Given a set of input regs that die in an asm_operands, it is
necessary to know which are implicitly popped by the asm, and which
must be explicitly popped by gcc.
An input reg that is implicitly popped by the asm must be
explicitly clobbered, unless it is constrained to match an output
operand.
2. For any input reg that is implicitly popped by an asm, it is
necessary to know how to adjust the stack to compensate for the
pop. If any non-popped input is closer to the top of the reg-stack
than the implicitly popped reg, it would not be possible to know
what the stack looked like--it's not clear how the rest of the
stack "slides up".
All implicitly popped input regs must be closer to the top of the
reg-stack than any input that is not implicitly popped.
It is possible that if an input dies in an insn, reload might use
the input reg for an output reload. Consider this example:
asm ("foo" : "=t" (a) : "f" (b));
This asm says that input B is not popped by the asm, and that the
asm pushes a result onto the reg-stack, i.e., the stack is one
deeper after the asm than it was before. But, it is possible that
reload will think that it can use the same reg for both the input
and the output, if input B dies in this insn.
If any input operand uses the 'f' constraint, all output reg
constraints must use the '&' earlyclobber.
The asm above would be written as
asm ("foo" : "=&t" (a) : "f" (b));
3. Some operands need to be in particular places on the stack. All
output operands fall in this category--there is no other way to
know which regs the outputs appear in unless the user indicates
this in the constraints.
Output operands must specifically indicate which reg an output
appears in after an asm. '=f' is not allowed: the operand
constraints must select a class with a single reg.
4. Output operands may not be "inserted" between existing stack regs.
Since no 387 opcode uses a read/write operand, all output operands
are dead before the asm_operands, and are pushed by the
asm_operands. It makes no sense to push anywhere but the top of
the reg-stack.
Output operands must start at the top of the reg-stack: output
operands may not "skip" a reg.
5. Some asm statements may need extra stack space for internal
calculations. This can be guaranteed by clobbering stack registers
unrelated to the inputs and outputs.
Here are a couple of reasonable asms to want to write. This asm takes
one input, which is internally popped, and produces two outputs.
asm ("fsincos" : "=t" (cos), "=u" (sin) : "0" (inp));
This asm takes two inputs, which are popped by the 'fyl2xp1' opcode,
and replaces them with one output. The user must code the 'st(1)'
clobber for reg-stack.c to know that 'fyl2xp1' pops both inputs.
asm ("fyl2xp1" : "=t" (result) : "0" (x), "u" (y) : "st(1)");

File: gcc.info, Node: Constraints, Next: Asm Labels, Prev: Extended Asm, Up: C Extensions
5.38 Constraints for 'asm' Operands
===================================
Here are specific details on what constraint letters you can use with
'asm' operands. Constraints can say whether an operand may be in a
register, and which kinds of register; whether the operand can be a
memory reference, and which kinds of address; whether the operand may be
an immediate constant, and which possible values it may have.
Constraints can also require two operands to match.
* Menu:
* Simple Constraints:: Basic use of constraints.
* Multi-Alternative:: When an insn has two alternative constraint-patterns.
* Modifiers:: More precise control over effects of constraints.
* Machine Constraints:: Special constraints for some particular machines.

File: gcc.info, Node: Simple Constraints, Next: Multi-Alternative, Up: Constraints
5.38.1 Simple Constraints
-------------------------
The simplest kind of constraint is a string full of letters, each of
which describes one kind of operand that is permitted. Here are the
letters that are allowed:
whitespace
Whitespace characters are ignored and can be inserted at any
position except the first. This enables each alternative for
different operands to be visually aligned in the machine
description even if they have different number of constraints and
modifiers.
'm'
A memory operand is allowed, with any kind of address that the
machine supports in general.
'o'
A memory operand is allowed, but only if the address is
"offsettable". This means that adding a small integer (actually,
the width in bytes of the operand, as determined by its machine
mode) may be added to the address and the result is also a valid
memory address.
For example, an address which is constant is offsettable; so is an
address that is the sum of a register and a constant (as long as a
slightly larger constant is also within the range of
address-offsets supported by the machine); but an autoincrement or
autodecrement address is not offsettable. More complicated
indirect/indexed addresses may or may not be offsettable depending
on the other addressing modes that the machine supports.
Note that in an output operand which can be matched by another
operand, the constraint letter 'o' is valid only when accompanied
by both '<' (if the target machine has predecrement addressing) and
'>' (if the target machine has preincrement addressing).
'V'
A memory operand that is not offsettable. In other words, anything
that would fit the 'm' constraint but not the 'o' constraint.
'<'
A memory operand with autodecrement addressing (either predecrement
or postdecrement) is allowed.
'>'
A memory operand with autoincrement addressing (either preincrement
or postincrement) is allowed.
'r'
A register operand is allowed provided that it is in a general
register.
'i'
An immediate integer operand (one with constant value) is allowed.
This includes symbolic constants whose values will be known only at
assembly time or later.
'n'
An immediate integer operand with a known numeric value is allowed.
Many systems cannot support assembly-time constants for operands
less than a word wide. Constraints for these operands should use
'n' rather than 'i'.
'I', 'J', 'K', ... 'P'
Other letters in the range 'I' through 'P' may be defined in a
machine-dependent fashion to permit immediate integer operands with
explicit integer values in specified ranges. For example, on the
68000, 'I' is defined to stand for the range of values 1 to 8.
This is the range permitted as a shift count in the shift
instructions.
'E'
An immediate floating operand (expression code 'const_double') is
allowed, but only if the target floating point format is the same
as that of the host machine (on which the compiler is running).
'F'
An immediate floating operand (expression code 'const_double' or
'const_vector') is allowed.
'G', 'H'
'G' and 'H' may be defined in a machine-dependent fashion to permit
immediate floating operands in particular ranges of values.
's'
An immediate integer operand whose value is not an explicit integer
is allowed.
This might appear strange; if an insn allows a constant operand
with a value not known at compile time, it certainly must allow any
known value. So why use 's' instead of 'i'? Sometimes it allows
better code to be generated.
For example, on the 68000 in a fullword instruction it is possible
to use an immediate operand; but if the immediate value is between
-128 and 127, better code results from loading the value into a
register and using the register. This is because the load into the
register can be done with a 'moveq' instruction. We arrange for
this to happen by defining the letter 'K' to mean "any integer
outside the range -128 to 127", and then specifying 'Ks' in the
operand constraints.
'g'
Any register, memory or immediate integer operand is allowed,
except for registers that are not general registers.
'X'
Any operand whatsoever is allowed.
'0', '1', '2', ... '9'
An operand that matches the specified operand number is allowed.
If a digit is used together with letters within the same
alternative, the digit should come last.
This number is allowed to be more than a single digit. If multiple
digits are encountered consecutively, they are interpreted as a
single decimal integer. There is scant chance for ambiguity, since
to-date it has never been desirable that '10' be interpreted as
matching either operand 1 _or_ operand 0. Should this be desired,
one can use multiple alternatives instead.
This is called a "matching constraint" and what it really means is
that the assembler has only a single operand that fills two roles
which 'asm' distinguishes. For example, an add instruction uses
two input operands and an output operand, but on most CISC machines
an add instruction really has only two operands, one of them an
input-output operand:
addl #35,r12
Matching constraints are used in these circumstances. More
precisely, the two operands that match must include one input-only
operand and one output-only operand. Moreover, the digit must be a
smaller number than the number of the operand that uses it in the
constraint.
'p'
An operand that is a valid memory address is allowed. This is for
"load address" and "push address" instructions.
'p' in the constraint must be accompanied by 'address_operand' as
the predicate in the 'match_operand'. This predicate interprets
the mode specified in the 'match_operand' as the mode of the memory
reference for which the address would be valid.
OTHER-LETTERS
Other letters can be defined in machine-dependent fashion to stand
for particular classes of registers or other arbitrary operand
types. 'd', 'a' and 'f' are defined on the 68000/68020 to stand
for data, address and floating point registers.

File: gcc.info, Node: Multi-Alternative, Next: Modifiers, Prev: Simple Constraints, Up: Constraints
5.38.2 Multiple Alternative Constraints
---------------------------------------
Sometimes a single instruction has multiple alternative sets of possible
operands. For example, on the 68000, a logical-or instruction can
combine register or an immediate value into memory, or it can combine
any kind of operand into a register; but it cannot combine one memory
location into another.
These constraints are represented as multiple alternatives. An
alternative can be described by a series of letters for each operand.
The overall constraint for an operand is made from the letters for this
operand from the first alternative, a comma, the letters for this
operand from the second alternative, a comma, and so on until the last
alternative.
If all the operands fit any one alternative, the instruction is valid.
Otherwise, for each alternative, the compiler counts how many
instructions must be added to copy the operands so that that alternative
applies. The alternative requiring the least copying is chosen. If two
alternatives need the same amount of copying, the one that comes first
is chosen. These choices can be altered with the '?' and '!'
characters:
'?'
Disparage slightly the alternative that the '?' appears in, as a
choice when no alternative applies exactly. The compiler regards
this alternative as one unit more costly for each '?' that appears
in it.
'!'
Disparage severely the alternative that the '!' appears in. This
alternative can still be used if it fits without reloading, but if
reloading is needed, some other alternative will be used.

File: gcc.info, Node: Modifiers, Next: Machine Constraints, Prev: Multi-Alternative, Up: Constraints
5.38.3 Constraint Modifier Characters
-------------------------------------
Here are constraint modifier characters.
'='
Means that this operand is write-only for this instruction: the
previous value is discarded and replaced by output data.
'+'
Means that this operand is both read and written by the
instruction.
When the compiler fixes up the operands to satisfy the constraints,
it needs to know which operands are inputs to the instruction and
which are outputs from it. '=' identifies an output; '+'
identifies an operand that is both input and output; all other
operands are assumed to be input only.
If you specify '=' or '+' in a constraint, you put it in the first
character of the constraint string.
'&'
Means (in a particular alternative) that this operand is an
"earlyclobber" operand, which is modified before the instruction is
finished using the input operands. Therefore, this operand may not
lie in a register that is used as an input operand or as part of
any memory address.
'&' applies only to the alternative in which it is written. In
constraints with multiple alternatives, sometimes one alternative
requires '&' while others do not. See, for example, the 'movdf'
insn of the 68000.
An input operand can be tied to an earlyclobber operand if its only
use as an input occurs before the early result is written. Adding
alternatives of this form often allows GCC to produce better code
when only some of the inputs can be affected by the earlyclobber.
See, for example, the 'mulsi3' insn of the ARM.
'&' does not obviate the need to write '='.
'%'
Declares the instruction to be commutative for this operand and the
following operand. This means that the compiler may interchange
the two operands if that is the cheapest way to make all operands
fit the constraints. GCC can only handle one commutative pair in
an asm; if you use more, the compiler may fail. Note that you need
not use the modifier if the two alternatives are strictly
identical; this would only waste time in the reload pass. The
modifier is not operational after register allocation, so the
result of 'define_peephole2' and 'define_split's performed after
reload cannot rely on '%' to make the intended insn match.
'#'
Says that all following characters, up to the next comma, are to be
ignored as a constraint. They are significant only for choosing
register preferences.
'*'
Says that the following character should be ignored when choosing
register preferences. '*' has no effect on the meaning of the
constraint as a constraint, and no effect on reloading.

File: gcc.info, Node: Machine Constraints, Prev: Modifiers, Up: Constraints
5.38.4 Constraints for Particular Machines
------------------------------------------
Whenever possible, you should use the general-purpose constraint letters
in 'asm' arguments, since they will convey meaning more readily to
people reading your code. Failing that, use the constraint letters that
usually have very similar meanings across architectures. The most
commonly used constraints are 'm' and 'r' (for memory and
general-purpose registers respectively; *note Simple Constraints::), and
'I', usually the letter indicating the most common immediate-constant
format.
Each architecture defines additional constraints. These constraints
are used by the compiler itself for instruction generation, as well as
for 'asm' statements; therefore, some of the constraints are not
particularly useful for 'asm'. Here is a summary of some of the
machine-dependent constraints available on some particular machines; it
includes both constraints that are useful for 'asm' and constraints that
aren't. The compiler source file mentioned in the table heading for
each architecture is the definitive reference for the meanings of that
architecture's constraints.
_ARM family--'config/arm/arm.h'_
'f'
Floating-point register
'w'
VFP floating-point register
'F'
One of the floating-point constants 0.0, 0.5, 1.0, 2.0, 3.0,
4.0, 5.0 or 10.0
'G'
Floating-point constant that would satisfy the constraint 'F'
if it were negated
'I'
Integer that is valid as an immediate operand in a data
processing instruction. That is, an integer in the range 0 to
255 rotated by a multiple of 2
'J'
Integer in the range -4095 to 4095
'K'
Integer that satisfies constraint 'I' when inverted (ones
complement)
'L'
Integer that satisfies constraint 'I' when negated (twos
complement)
'M'
Integer in the range 0 to 32
'Q'
A memory reference where the exact address is in a single
register (''m'' is preferable for 'asm' statements)
'R'
An item in the constant pool
'S'
A symbol in the text segment of the current file
'Uv'
A memory reference suitable for VFP load/store insns
(reg+constant offset)
'Uy'
A memory reference suitable for iWMMXt load/store
instructions.
'Uq'
A memory reference suitable for the ARMv4 ldrsb instruction.
_AVR family--'config/avr/constraints.md'_
'l'
Registers from r0 to r15
'a'
Registers from r16 to r23
'd'
Registers from r16 to r31
'w'
Registers from r24 to r31. These registers can be used in
'adiw' command
'e'
Pointer register (r26-r31)
'b'
Base pointer register (r28-r31)
'q'
Stack pointer register (SPH:SPL)
't'
Temporary register r0
'x'
Register pair X (r27:r26)
'y'
Register pair Y (r29:r28)
'z'
Register pair Z (r31:r30)
'I'
Constant greater than -1, less than 64
'J'
Constant greater than -64, less than 1
'K'
Constant integer 2
'L'
Constant integer 0
'M'
Constant that fits in 8 bits
'N'
Constant integer -1
'O'
Constant integer 8, 16, or 24
'P'
Constant integer 1
'G'
A floating point constant 0.0
'R'
Integer constant in the range -6 ... 5.
'Q'
A memory address based on Y or Z pointer with displacement.
_CRX Architecture--'config/crx/crx.h'_
'b'
Registers from r0 to r14 (registers without stack pointer)
'l'
Register r16 (64-bit accumulator lo register)
'h'
Register r17 (64-bit accumulator hi register)
'k'
Register pair r16-r17. (64-bit accumulator lo-hi pair)
'I'
Constant that fits in 3 bits
'J'
Constant that fits in 4 bits
'K'
Constant that fits in 5 bits
'L'
Constant that is one of -1, 4, -4, 7, 8, 12, 16, 20, 32, 48
'G'
Floating point constant that is legal for store immediate
_Hewlett-Packard PA-RISC--'config/pa/pa.h'_
'a'
General register 1
'f'
Floating point register
'q'
Shift amount register
'x'
Floating point register (deprecated)
'y'
Upper floating point register (32-bit), floating point
register (64-bit)
'Z'
Any register
'I'
Signed 11-bit integer constant
'J'
Signed 14-bit integer constant
'K'
Integer constant that can be deposited with a 'zdepi'
instruction
'L'
Signed 5-bit integer constant
'M'
Integer constant 0
'N'
Integer constant that can be loaded with a 'ldil' instruction
'O'
Integer constant whose value plus one is a power of 2
'P'
Integer constant that can be used for 'and' operations in
'depi' and 'extru' instructions
'S'
Integer constant 31
'U'
Integer constant 63
'G'
Floating-point constant 0.0
'A'
A 'lo_sum' data-linkage-table memory operand
'Q'
A memory operand that can be used as the destination operand
of an integer store instruction
'R'
A scaled or unscaled indexed memory operand
'T'
A memory operand for floating-point loads and stores
'W'
A register indirect memory operand
_PowerPC and IBM RS6000--'config/rs6000/rs6000.h'_
'b'
Address base register
'f'
Floating point register
'v'
Vector register
'h'
'MQ', 'CTR', or 'LINK' register
'q'
'MQ' register
'c'
'CTR' register
'l'
'LINK' register
'x'
'CR' register (condition register) number 0
'y'
'CR' register (condition register)
'z'
'FPMEM' stack memory for FPR-GPR transfers
'I'
Signed 16-bit constant
'J'
Unsigned 16-bit constant shifted left 16 bits (use 'L' instead
for 'SImode' constants)
'K'
Unsigned 16-bit constant
'L'
Signed 16-bit constant shifted left 16 bits
'M'
Constant larger than 31
'N'
Exact power of 2
'O'
Zero
'P'
Constant whose negation is a signed 16-bit constant
'G'
Floating point constant that can be loaded into a register
with one instruction per word
'H'
Integer/Floating point constant that can be loaded into a
register using three instructions
'Q'
Memory operand that is an offset from a register ('m' is
preferable for 'asm' statements)
'Z'
Memory operand that is an indexed or indirect from a register
('m' is preferable for 'asm' statements)
'R'
AIX TOC entry
'a'
Address operand that is an indexed or indirect from a register
('p' is preferable for 'asm' statements)
'S'
Constant suitable as a 64-bit mask operand
'T'
Constant suitable as a 32-bit mask operand
'U'
System V Release 4 small data area reference
't'
AND masks that can be performed by two rldic{l, r}
instructions
'W'
Vector constant that does not require memory
_MorphoTech family--'config/mt/mt.h'_
'I'
Constant for an arithmetic insn (16-bit signed integer).
'J'
The constant 0.
'K'
Constant for a logical insn (16-bit zero-extended integer).
'L'
A constant that can be loaded with 'lui' (i.e. the bottom 16
bits are zero).
'M'
A constant that takes two words to load (i.e. not matched by
'I', 'K', or 'L').
'N'
Negative 16-bit constants other than -65536.
'O'
A 15-bit signed integer constant.
'P'
A positive 16-bit constant.
_Intel 386--'config/i386/constraints.md'_
'R'
Legacy register--the eight integer registers available on all
i386 processors ('a', 'b', 'c', 'd', 'si', 'di', 'bp', 'sp').
'q'
Any register accessible as 'Rl'. In 32-bit mode, 'a', 'b',
'c', and 'd'; in 64-bit mode, any integer register.
'Q'
Any register accessible as 'Rh': 'a', 'b', 'c', and 'd'.
'a'
The 'a' register.
'b'
The 'b' register.
'c'
The 'c' register.
'd'
The 'd' register.
'S'
The 'si' register.
'D'
The 'di' register.
'A'
The 'a' and 'd' registers, as a pair (for instructions that
return half the result in one and half in the other).
'f'
Any 80387 floating-point (stack) register.
't'
Top of 80387 floating-point stack ('%st(0)').
'u'
Second from top of 80387 floating-point stack ('%st(1)').
'y'
Any MMX register.
'x'
Any SSE register.
'Yz'
First SSE register ('%xmm0').
'I'
Integer constant in the range 0 ... 31, for 32-bit shifts.
'J'
Integer constant in the range 0 ... 63, for 64-bit shifts.
'K'
Signed 8-bit integer constant.
'L'
'0xFF' or '0xFFFF', for andsi as a zero-extending move.
'M'
0, 1, 2, or 3 (shifts for the 'lea' instruction).
'N'
Unsigned 8-bit integer constant (for 'in' and 'out'
instructions).
'G'
Standard 80387 floating point constant.
'C'
Standard SSE floating point constant.
'e'
32-bit signed integer constant, or a symbolic reference known
to fit that range (for immediate operands in sign-extending
x86-64 instructions).
'Z'
32-bit unsigned integer constant, or a symbolic reference
known to fit that range (for immediate operands in
zero-extending x86-64 instructions).
_Intel IA-64--'config/ia64/ia64.h'_
'a'
General register 'r0' to 'r3' for 'addl' instruction
'b'
Branch register
'c'
Predicate register ('c' as in "conditional")
'd'
Application register residing in M-unit
'e'
Application register residing in I-unit
'f'
Floating-point register
'm'
Memory operand. Remember that 'm' allows postincrement and
postdecrement which require printing with '%Pn' on IA-64. Use
'S' to disallow postincrement and postdecrement.
'G'
Floating-point constant 0.0 or 1.0
'I'
14-bit signed integer constant
'J'
22-bit signed integer constant
'K'
8-bit signed integer constant for logical instructions
'L'
8-bit adjusted signed integer constant for compare pseudo-ops
'M'
6-bit unsigned integer constant for shift counts
'N'
9-bit signed integer constant for load and store
postincrements
'O'
The constant zero
'P'
0 or -1 for 'dep' instruction
'Q'
Non-volatile memory for floating-point loads and stores
'R'
Integer constant in the range 1 to 4 for 'shladd' instruction
'S'
Memory operand except postincrement and postdecrement
_FRV--'config/frv/frv.h'_
'a'
Register in the class 'ACC_REGS' ('acc0' to 'acc7').
'b'
Register in the class 'EVEN_ACC_REGS' ('acc0' to 'acc7').
'c'
Register in the class 'CC_REGS' ('fcc0' to 'fcc3' and 'icc0'
to 'icc3').
'd'
Register in the class 'GPR_REGS' ('gr0' to 'gr63').
'e'
Register in the class 'EVEN_REGS' ('gr0' to 'gr63'). Odd
registers are excluded not in the class but through the use of
a machine mode larger than 4 bytes.
'f'
Register in the class 'FPR_REGS' ('fr0' to 'fr63').
'h'
Register in the class 'FEVEN_REGS' ('fr0' to 'fr63'). Odd
registers are excluded not in the class but through the use of
a machine mode larger than 4 bytes.
'l'
Register in the class 'LR_REG' (the 'lr' register).
'q'
Register in the class 'QUAD_REGS' ('gr2' to 'gr63'). Register
numbers not divisible by 4 are excluded not in the class but
through the use of a machine mode larger than 8 bytes.
't'
Register in the class 'ICC_REGS' ('icc0' to 'icc3').
'u'
Register in the class 'FCC_REGS' ('fcc0' to 'fcc3').
'v'
Register in the class 'ICR_REGS' ('cc4' to 'cc7').
'w'
Register in the class 'FCR_REGS' ('cc0' to 'cc3').
'x'
Register in the class 'QUAD_FPR_REGS' ('fr0' to 'fr63').
Register numbers not divisible by 4 are excluded not in the
class but through the use of a machine mode larger than 8
bytes.
'z'
Register in the class 'SPR_REGS' ('lcr' and 'lr').
'A'
Register in the class 'QUAD_ACC_REGS' ('acc0' to 'acc7').
'B'
Register in the class 'ACCG_REGS' ('accg0' to 'accg7').
'C'
Register in the class 'CR_REGS' ('cc0' to 'cc7').
'G'
Floating point constant zero
'I'
6-bit signed integer constant
'J'
10-bit signed integer constant
'L'
16-bit signed integer constant
'M'
16-bit unsigned integer constant
'N'
12-bit signed integer constant that is negative--i.e. in the
range of -2048 to -1
'O'
Constant zero
'P'
12-bit signed integer constant that is greater than zero--i.e.
in the range of 1 to 2047.
_Blackfin family--'config/bfin/bfin.h'_
'a'
P register
'd'
D register
'z'
A call clobbered P register.
'qN'
A single register. If N is in the range 0 to 7, the
corresponding D register. If it is 'A', then the register P0.
'D'
Even-numbered D register
'W'
Odd-numbered D register
'e'
Accumulator register.
'A'
Even-numbered accumulator register.
'B'
Odd-numbered accumulator register.
'b'
I register
'v'
B register
'f'
M register
'c'
Registers used for circular buffering, i.e. I, B, or L
registers.
'C'
The CC register.
't'
LT0 or LT1.
'k'
LC0 or LC1.
'u'
LB0 or LB1.
'x'
Any D, P, B, M, I or L register.
'y'
Additional registers typically used only in prologues and
epilogues: RETS, RETN, RETI, RETX, RETE, ASTAT, SEQSTAT and
USP.
'w'
Any register except accumulators or CC.
'Ksh'
Signed 16 bit integer (in the range -32768 to 32767)
'Kuh'
Unsigned 16 bit integer (in the range 0 to 65535)
'Ks7'
Signed 7 bit integer (in the range -64 to 63)
'Ku7'
Unsigned 7 bit integer (in the range 0 to 127)
'Ku5'
Unsigned 5 bit integer (in the range 0 to 31)
'Ks4'
Signed 4 bit integer (in the range -8 to 7)
'Ks3'
Signed 3 bit integer (in the range -3 to 4)
'Ku3'
Unsigned 3 bit integer (in the range 0 to 7)
'PN'
Constant N, where N is a single-digit constant in the range 0
to 4.
'PA'
An integer equal to one of the MACFLAG_XXX constants that is
suitable for use with either accumulator.
'PB'
An integer equal to one of the MACFLAG_XXX constants that is
suitable for use only with accumulator A1.
'M1'
Constant 255.
'M2'
Constant 65535.
'J'
An integer constant with exactly a single bit set.
'L'
An integer constant with all bits set except exactly one.
'H'
'Q'
Any SYMBOL_REF.
_M32C--'config/m32c/m32c.c'_
'Rsp'
'Rfb'
'Rsb'
'$sp', '$fb', '$sb'.
'Rcr'
Any control register, when they're 16 bits wide (nothing if
control registers are 24 bits wide)
'Rcl'
Any control register, when they're 24 bits wide.
'R0w'
'R1w'
'R2w'
'R3w'
$r0, $r1, $r2, $r3.
'R02'
$r0 or $r2, or $r2r0 for 32 bit values.
'R13'
$r1 or $r3, or $r3r1 for 32 bit values.
'Rdi'
A register that can hold a 64 bit value.
'Rhl'
$r0 or $r1 (registers with addressable high/low bytes)
'R23'
$r2 or $r3
'Raa'
Address registers
'Raw'
Address registers when they're 16 bits wide.
'Ral'
Address registers when they're 24 bits wide.
'Rqi'
Registers that can hold QI values.
'Rad'
Registers that can be used with displacements ($a0, $a1, $sb).
'Rsi'
Registers that can hold 32 bit values.
'Rhi'
Registers that can hold 16 bit values.
'Rhc'
Registers chat can hold 16 bit values, including all control
registers.
'Rra'
$r0 through R1, plus $a0 and $a1.
'Rfl'
The flags register.
'Rmm'
The memory-based pseudo-registers $mem0 through $mem15.
'Rpi'
Registers that can hold pointers (16 bit registers for r8c,
m16c; 24 bit registers for m32cm, m32c).
'Rpa'
Matches multiple registers in a PARALLEL to form a larger
register. Used to match function return values.
'Is3'
-8 ... 7
'IS1'
-128 ... 127
'IS2'
-32768 ... 32767
'IU2'
0 ... 65535
'In4'
-8 ... -1 or 1 ... 8
'In5'
-16 ... -1 or 1 ... 16
'In6'
-32 ... -1 or 1 ... 32
'IM2'
-65536 ... -1
'Ilb'
An 8 bit value with exactly one bit set.
'Ilw'
A 16 bit value with exactly one bit set.
'Sd'
The common src/dest memory addressing modes.
'Sa'
Memory addressed using $a0 or $a1.
'Si'
Memory addressed with immediate addresses.
'Ss'
Memory addressed using the stack pointer ($sp).
'Sf'
Memory addressed using the frame base register ($fb).
'Ss'
Memory addressed using the small base register ($sb).
'S1'
$r1h
_MIPS--'config/mips/constraints.md'_
'd'
An address register. This is equivalent to 'r' unless
generating MIPS16 code.
'f'
A floating-point register (if available).
'h'
The 'hi' register.
'l'
The 'lo' register.
'x'
The 'hi' and 'lo' registers.
'c'
A register suitable for use in an indirect jump. This will
always be '$25' for '-mabicalls'.
'v'
Register '$3'. Do not use this constraint in new code; it is
retained only for compatibility with glibc.
'y'
Equivalent to 'r'; retained for backwards compatibility.
'z'
A floating-point condition code register.
'I'
A signed 16-bit constant (for arithmetic instructions).
'J'
Integer zero.
'K'
An unsigned 16-bit constant (for logic instructions).
'L'
A signed 32-bit constant in which the lower 16 bits are zero.
Such constants can be loaded using 'lui'.
'M'
A constant that cannot be loaded using 'lui', 'addiu' or
'ori'.
'N'
A constant in the range -65535 to -1 (inclusive).
'O'
A signed 15-bit constant.
'P'
A constant in the range 1 to 65535 (inclusive).
'G'
Floating-point zero.
'R'
An address that can be used in a non-macro load or store.
_Motorola 680x0--'config/m68k/constraints.md'_
'a'
Address register
'd'
Data register
'f'
68881 floating-point register, if available
'I'
Integer in the range 1 to 8
'J'
16-bit signed number
'K'
Signed number whose magnitude is greater than 0x80
'L'
Integer in the range -8 to -1
'M'
Signed number whose magnitude is greater than 0x100
'N'
Range 24 to 31, rotatert:SI 8 to 1 expressed as rotate
'O'
16 (for rotate using swap)
'P'
Range 8 to 15, rotatert:HI 8 to 1 expressed as rotate
'R'
Numbers that mov3q can handle
'G'
Floating point constant that is not a 68881 constant
'S'
Operands that satisfy 'm' when -mpcrel is in effect
'T'
Operands that satisfy 's' when -mpcrel is not in effect
'Q'
Address register indirect addressing mode
'U'
Register offset addressing
'W'
const_call_operand
'Cs'
symbol_ref or const
'Ci'
const_int
'C0'
const_int 0
'Cj'
Range of signed numbers that don't fit in 16 bits
'Cmvq'
Integers valid for mvq
'Capsw'
Integers valid for a moveq followed by a swap
'Cmvz'
Integers valid for mvz
'Cmvs'
Integers valid for mvs
'Ap'
push_operand
'Ac'
Non-register operands allowed in clr
_Motorola 68HC11 & 68HC12 families--'config/m68hc11/m68hc11.h'_
'a'
Register 'a'
'b'
Register 'b'
'd'
Register 'd'
'q'
An 8-bit register
't'
Temporary soft register _.tmp
'u'
A soft register _.d1 to _.d31
'w'
Stack pointer register
'x'
Register 'x'
'y'
Register 'y'
'z'
Pseudo register 'z' (replaced by 'x' or 'y' at the end)
'A'
An address register: x, y or z
'B'
An address register: x or y
'D'
Register pair (x:d) to form a 32-bit value
'L'
Constants in the range -65536 to 65535
'M'
Constants whose 16-bit low part is zero
'N'
Constant integer 1 or -1
'O'
Constant integer 16
'P'
Constants in the range -8 to 2
_SPARC--'config/sparc/sparc.h'_
'f'
Floating-point register on the SPARC-V8 architecture and lower
floating-point register on the SPARC-V9 architecture.
'e'
Floating-point register. It is equivalent to 'f' on the
SPARC-V8 architecture and contains both lower and upper
floating-point registers on the SPARC-V9 architecture.
'c'
Floating-point condition code register.
'd'
Lower floating-point register. It is only valid on the
SPARC-V9 architecture when the Visual Instruction Set is
available.
'b'
Floating-point register. It is only valid on the SPARC-V9
architecture when the Visual Instruction Set is available.
'h'
64-bit global or out register for the SPARC-V8+ architecture.
'D'
A vector constant
'I'
Signed 13-bit constant
'J'
Zero
'K'
32-bit constant with the low 12 bits clear (a constant that
can be loaded with the 'sethi' instruction)
'L'
A constant in the range supported by 'movcc' instructions
'M'
A constant in the range supported by 'movrcc' instructions
'N'
Same as 'K', except that it verifies that bits that are not in
the lower 32-bit range are all zero. Must be used instead of
'K' for modes wider than 'SImode'
'O'
The constant 4096
'G'
Floating-point zero
'H'
Signed 13-bit constant, sign-extended to 32 or 64 bits
'Q'
Floating-point constant whose integral representation can be
moved into an integer register using a single sethi
instruction
'R'
Floating-point constant whose integral representation can be
moved into an integer register using a single mov instruction
'S'
Floating-point constant whose integral representation can be
moved into an integer register using a high/lo_sum instruction
sequence
'T'
Memory address aligned to an 8-byte boundary
'U'
Even register
'W'
Memory address for 'e' constraint registers
'Y'
Vector zero
_SPU--'config/spu/spu.h'_
'a'
An immediate which can be loaded with the il/ila/ilh/ilhu
instructions. const_int is treated as a 64 bit value.
'c'
An immediate for and/xor/or instructions. const_int is
treated as a 64 bit value.
'd'
An immediate for the 'iohl' instruction. const_int is treated
as a 64 bit value.
'f'
An immediate which can be loaded with 'fsmbi'.
'A'
An immediate which can be loaded with the il/ila/ilh/ilhu
instructions. const_int is treated as a 32 bit value.
'B'
An immediate for most arithmetic instructions. const_int is
treated as a 32 bit value.
'C'
An immediate for and/xor/or instructions. const_int is
treated as a 32 bit value.
'D'
An immediate for the 'iohl' instruction. const_int is treated
as a 32 bit value.
'I'
A constant in the range [-64, 63] for shift/rotate
instructions.
'J'
An unsigned 7-bit constant for conversion/nop/channel
instructions.
'K'
A signed 10-bit constant for most arithmetic instructions.
'M'
A signed 16 bit immediate for 'stop'.
'N'
An unsigned 16-bit constant for 'iohl' and 'fsmbi'.
'O'
An unsigned 7-bit constant whose 3 least significant bits are
0.
'P'
An unsigned 3-bit constant for 16-byte rotates and shifts
'R'
Call operand, reg, for indirect calls
'S'
Call operand, symbol, for relative calls.
'T'
Call operand, const_int, for absolute calls.
'U'
An immediate which can be loaded with the il/ila/ilh/ilhu
instructions. const_int is sign extended to 128 bit.
'W'
An immediate for shift and rotate instructions. const_int is
treated as a 32 bit value.
'Y'
An immediate for and/xor/or instructions. const_int is sign
extended as a 128 bit.
'Z'
An immediate for the 'iohl' instruction. const_int is sign
extended to 128 bit.
_S/390 and zSeries--'config/s390/s390.h'_
'a'
Address register (general purpose register except r0)
'c'
Condition code register
'd'
Data register (arbitrary general purpose register)
'f'
Floating-point register
'I'
Unsigned 8-bit constant (0-255)
'J'
Unsigned 12-bit constant (0-4095)
'K'
Signed 16-bit constant (-32768-32767)
'L'
Value appropriate as displacement.
'(0..4095)'
for short displacement
'(-524288..524287)'
for long displacement
'M'
Constant integer with a value of 0x7fffffff.
'N'
Multiple letter constraint followed by 4 parameter letters.
'0..9:'
number of the part counting from most to least
significant
'H,Q:'
mode of the part
'D,S,H:'
mode of the containing operand
'0,F:'
value of the other parts (F--all bits set)
The constraint matches if the specified part of a constant has
a value different from its other parts.
'Q'
Memory reference without index register and with short
displacement.
'R'
Memory reference with index register and short displacement.
'S'
Memory reference without index register but with long
displacement.
'T'
Memory reference with index register and long displacement.
'U'
Pointer with short displacement.
'W'
Pointer with long displacement.
'Y'
Shift count operand.
_Score family--'config/score/score.h'_
'd'
Registers from r0 to r32.
'e'
Registers from r0 to r16.
't'
r8--r11 or r22--r27 registers.
'h'
hi register.
'l'
lo register.
'x'
hi + lo register.
'q'
cnt register.
'y'
lcb register.
'z'
scb register.
'a'
cnt + lcb + scb register.
'c'
cr0--cr15 register.
'b'
cp1 registers.
'f'
cp2 registers.
'i'
cp3 registers.
'j'
cp1 + cp2 + cp3 registers.
'I'
High 16-bit constant (32-bit constant with 16 LSBs zero).
'J'
Unsigned 5 bit integer (in the range 0 to 31).
'K'
Unsigned 16 bit integer (in the range 0 to 65535).
'L'
Signed 16 bit integer (in the range -32768 to 32767).
'M'
Unsigned 14 bit integer (in the range 0 to 16383).
'N'
Signed 14 bit integer (in the range -8192 to 8191).
'Z'
Any SYMBOL_REF.
_Xstormy16--'config/stormy16/stormy16.h'_
'a'
Register r0.
'b'
Register r1.
'c'
Register r2.
'd'
Register r8.
'e'
Registers r0 through r7.
't'
Registers r0 and r1.
'y'
The carry register.
'z'
Registers r8 and r9.
'I'
A constant between 0 and 3 inclusive.
'J'
A constant that has exactly one bit set.
'K'
A constant that has exactly one bit clear.
'L'
A constant between 0 and 255 inclusive.
'M'
A constant between -255 and 0 inclusive.
'N'
A constant between -3 and 0 inclusive.
'O'
A constant between 1 and 4 inclusive.
'P'
A constant between -4 and -1 inclusive.
'Q'
A memory reference that is a stack push.
'R'
A memory reference that is a stack pop.
'S'
A memory reference that refers to a constant address of known
value.
'T'
The register indicated by Rx (not implemented yet).
'U'
A constant that is not between 2 and 15 inclusive.
'Z'
The constant 0.
_Xtensa--'config/xtensa/constraints.md'_
'a'
General-purpose 32-bit register
'b'
One-bit boolean register
'A'
MAC16 40-bit accumulator register
'I'
Signed 12-bit integer constant, for use in MOVI instructions
'J'
Signed 8-bit integer constant, for use in ADDI instructions
'K'
Integer constant valid for BccI instructions
'L'
Unsigned constant valid for BccUI instructions

File: gcc.info, Node: Asm Labels, Next: Explicit Reg Vars, Prev: Constraints, Up: C Extensions
5.39 Controlling Names Used in Assembler Code
=============================================
You can specify the name to be used in the assembler code for a C
function or variable by writing the 'asm' (or '__asm__') keyword after
the declarator as follows:
int foo asm ("myfoo") = 2;
This specifies that the name to be used for the variable 'foo' in the
assembler code should be 'myfoo' rather than the usual '_foo'.
On systems where an underscore is normally prepended to the name of a C
function or variable, this feature allows you to define names for the
linker that do not start with an underscore.
It does not make sense to use this feature with a non-static local
variable since such variables do not have assembler names. If you are
trying to put the variable in a particular register, see *note Explicit
Reg Vars::. GCC presently accepts such code with a warning, but will
probably be changed to issue an error, rather than a warning, in the
future.
You cannot use 'asm' in this way in a function _definition_; but you
can get the same effect by writing a declaration for the function before
its definition and putting 'asm' there, like this:
extern func () asm ("FUNC");
func (x, y)
int x, y;
/* ... */
It is up to you to make sure that the assembler names you choose do not
conflict with any other assembler symbols. Also, you must not use a
register name; that would produce completely invalid assembler code.
GCC does not as yet have the ability to store static variables in
registers. Perhaps that will be added.

File: gcc.info, Node: Explicit Reg Vars, Next: Alternate Keywords, Prev: Asm Labels, Up: C Extensions
5.40 Variables in Specified Registers
=====================================
GNU C allows you to put a few global variables into specified hardware
registers. You can also specify the register in which an ordinary
register variable should be allocated.
* Global register variables reserve registers throughout the program.
This may be useful in programs such as programming language
interpreters which have a couple of global variables that are
accessed very often.
* Local register variables in specific registers do not reserve the
registers, except at the point where they are used as input or
output operands in an 'asm' statement and the 'asm' statement
itself is not deleted. The compiler's data flow analysis is
capable of determining where the specified registers contain live
values, and where they are available for other uses. Stores into
local register variables may be deleted when they appear to be dead
according to dataflow analysis. References to local register
variables may be deleted or moved or simplified.
These local variables are sometimes convenient for use with the
extended 'asm' feature (*note Extended Asm::), if you want to write
one output of the assembler instruction directly into a particular
register. (This will work provided the register you specify fits
the constraints specified for that operand in the 'asm'.)
* Menu:
* Global Reg Vars::
* Local Reg Vars::

File: gcc.info, Node: Global Reg Vars, Next: Local Reg Vars, Up: Explicit Reg Vars
5.40.1 Defining Global Register Variables
-----------------------------------------
You can define a global register variable in GNU C like this:
register int *foo asm ("a5");
Here 'a5' is the name of the register which should be used. Choose a
register which is normally saved and restored by function calls on your
machine, so that library routines will not clobber it.
Naturally the register name is cpu-dependent, so you would need to
conditionalize your program according to cpu type. The register 'a5'
would be a good choice on a 68000 for a variable of pointer type. On
machines with register windows, be sure to choose a "global" register
that is not affected magically by the function call mechanism.
In addition, operating systems on one type of cpu may differ in how
they name the registers; then you would need additional conditionals.
For example, some 68000 operating systems call this register '%a5'.
Eventually there may be a way of asking the compiler to choose a
register automatically, but first we need to figure out how it should
choose and how to enable you to guide the choice. No solution is
evident.
Defining a global register variable in a certain register reserves that
register entirely for this use, at least within the current compilation.
The register will not be allocated for any other purpose in the
functions in the current compilation. The register will not be saved
and restored by these functions. Stores into this register are never
deleted even if they would appear to be dead, but references may be
deleted or moved or simplified.
It is not safe to access the global register variables from signal
handlers, or from more than one thread of control, because the system
library routines may temporarily use the register for other things
(unless you recompile them specially for the task at hand).
It is not safe for one function that uses a global register variable to
call another such function 'foo' by way of a third function 'lose' that
was compiled without knowledge of this variable (i.e. in a different
source file in which the variable wasn't declared). This is because
'lose' might save the register and put some other value there. For
example, you can't expect a global register variable to be available in
the comparison-function that you pass to 'qsort', since 'qsort' might
have put something else in that register. (If you are prepared to
recompile 'qsort' with the same global register variable, you can solve
this problem.)
If you want to recompile 'qsort' or other source files which do not
actually use your global register variable, so that they will not use
that register for any other purpose, then it suffices to specify the
compiler option '-ffixed-REG'. You need not actually add a global
register declaration to their source code.
A function which can alter the value of a global register variable
cannot safely be called from a function compiled without this variable,
because it could clobber the value the caller expects to find there on
return. Therefore, the function which is the entry point into the part
of the program that uses the global register variable must explicitly
save and restore the value which belongs to its caller.
On most machines, 'longjmp' will restore to each global register
variable the value it had at the time of the 'setjmp'. On some
machines, however, 'longjmp' will not change the value of global
register variables. To be portable, the function that called 'setjmp'
should make other arrangements to save the values of the global register
variables, and to restore them in a 'longjmp'. This way, the same thing
will happen regardless of what 'longjmp' does.
All global register variable declarations must precede all function
definitions. If such a declaration could appear after function
definitions, the declaration would be too late to prevent the register
from being used for other purposes in the preceding functions.
Global register variables may not have initial values, because an
executable file has no means to supply initial contents for a register.
On the SPARC, there are reports that g3 ... g7 are suitable registers,
but certain library functions, such as 'getwd', as well as the
subroutines for division and remainder, modify g3 and g4. g1 and g2 are
local temporaries.
On the 68000, a2 ... a5 should be suitable, as should d2 ... d7. Of
course, it will not do to use more than a few of those.

File: gcc.info, Node: Local Reg Vars, Prev: Global Reg Vars, Up: Explicit Reg Vars
5.40.2 Specifying Registers for Local Variables
-----------------------------------------------
You can define a local register variable with a specified register like
this:
register int *foo asm ("a5");
Here 'a5' is the name of the register which should be used. Note that
this is the same syntax used for defining global register variables, but
for a local variable it would appear within a function.
Naturally the register name is cpu-dependent, but this is not a
problem, since specific registers are most often useful with explicit
assembler instructions (*note Extended Asm::). Both of these things
generally require that you conditionalize your program according to cpu
type.
In addition, operating systems on one type of cpu may differ in how
they name the registers; then you would need additional conditionals.
For example, some 68000 operating systems call this register '%a5'.
Defining such a register variable does not reserve the register; it
remains available for other uses in places where flow control determines
the variable's value is not live.
This option does not guarantee that GCC will generate code that has
this variable in the register you specify at all times. You may not
code an explicit reference to this register in the _assembler
instruction template_ part of an 'asm' statement and assume it will
always refer to this variable. However, using the variable as an 'asm'
_operand_ guarantees that the specified register is used for the
operand.
Stores into local register variables may be deleted when they appear to
be dead according to dataflow analysis. References to local register
variables may be deleted or moved or simplified.
As for global register variables, it's recommended that you choose a
register which is normally saved and restored by function calls on your
machine, so that library routines will not clobber it. A common pitfall
is to initialize multiple call-clobbered registers with arbitrary
expressions, where a function call or library call for an arithmetic
operator will overwrite a register value from a previous assignment, for
example 'r0' below:
register int *p1 asm ("r0") = ...;
register int *p2 asm ("r1") = ...;
In those cases, a solution is to use a temporary variable for each
arbitrary expression. *Note Example of asm with clobbered asm reg::.

File: gcc.info, Node: Alternate Keywords, Next: Incomplete Enums, Prev: Explicit Reg Vars, Up: C Extensions
5.41 Alternate Keywords
=======================
'-ansi' and the various '-std' options disable certain keywords. This
causes trouble when you want to use GNU C extensions, or a
general-purpose header file that should be usable by all programs,
including ISO C programs. The keywords 'asm', 'typeof' and 'inline' are
not available in programs compiled with '-ansi' or '-std' (although
'inline' can be used in a program compiled with '-std=c99'). The ISO
C99 keyword 'restrict' is only available when '-std=gnu99' (which will
eventually be the default) or '-std=c99' (or the equivalent
'-std=iso9899:1999') is used.
The way to solve these problems is to put '__' at the beginning and end
of each problematical keyword. For example, use '__asm__' instead of
'asm', and '__inline__' instead of 'inline'.
Other C compilers won't accept these alternative keywords; if you want
to compile with another compiler, you can define the alternate keywords
as macros to replace them with the customary keywords. It looks like
this:
#ifndef __GNUC__
#define __asm__ asm
#endif
'-pedantic' and other options cause warnings for many GNU C extensions.
You can prevent such warnings within one expression by writing
'__extension__' before the expression. '__extension__' has no effect
aside from this.

File: gcc.info, Node: Incomplete Enums, Next: Function Names, Prev: Alternate Keywords, Up: C Extensions
5.42 Incomplete 'enum' Types
============================
You can define an 'enum' tag without specifying its possible values.
This results in an incomplete type, much like what you get if you write
'struct foo' without describing the elements. A later declaration which
does specify the possible values completes the type.
You can't allocate variables or storage using the type while it is
incomplete. However, you can work with pointers to that type.
This extension may not be very useful, but it makes the handling of
'enum' more consistent with the way 'struct' and 'union' are handled.
This extension is not supported by GNU C++.

File: gcc.info, Node: Function Names, Next: Return Address, Prev: Incomplete Enums, Up: C Extensions
5.43 Function Names as Strings
==============================
GCC provides three magic variables which hold the name of the current
function, as a string. The first of these is '__func__', which is part
of the C99 standard:
The identifier '__func__' is implicitly declared by the translator
as if, immediately following the opening brace of each function
definition, the declaration
static const char __func__[] = "function-name";
appeared, where function-name is the name of the lexically-enclosing
function. This name is the unadorned name of the function.
'__FUNCTION__' is another name for '__func__'. Older versions of GCC
recognize only this name. However, it is not standardized. For maximum
portability, we recommend you use '__func__', but provide a fallback
definition with the preprocessor:
#if __STDC_VERSION__ < 199901L
# if __GNUC__ >= 2
# define __func__ __FUNCTION__
# else
# define __func__ "<unknown>"
# endif
#endif
In C, '__PRETTY_FUNCTION__' is yet another name for '__func__'.
However, in C++, '__PRETTY_FUNCTION__' contains the type signature of
the function as well as its bare name. For example, this program:
extern "C" {
extern int printf (char *, ...);
}
class a {
public:
void sub (int i)
{
printf ("__FUNCTION__ = %s\n", __FUNCTION__);
printf ("__PRETTY_FUNCTION__ = %s\n", __PRETTY_FUNCTION__);
}
};
int
main (void)
{
a ax;
ax.sub (0);
return 0;
}
gives this output:
__FUNCTION__ = sub
__PRETTY_FUNCTION__ = void a::sub(int)
These identifiers are not preprocessor macros. In GCC 3.3 and earlier,
in C only, '__FUNCTION__' and '__PRETTY_FUNCTION__' were treated as
string literals; they could be used to initialize 'char' arrays, and
they could be concatenated with other string literals. GCC 3.4 and
later treat them as variables, like '__func__'. In C++, '__FUNCTION__'
and '__PRETTY_FUNCTION__' have always been variables.

File: gcc.info, Node: Return Address, Next: Vector Extensions, Prev: Function Names, Up: C Extensions
5.44 Getting the Return or Frame Address of a Function
======================================================
These functions may be used to get information about the callers of a
function.
-- Built-in Function: void * __builtin_return_address (unsigned int
LEVEL)
This function returns the return address of the current function,
or of one of its callers. The LEVEL argument is number of frames
to scan up the call stack. A value of '0' yields the return
address of the current function, a value of '1' yields the return
address of the caller of the current function, and so forth. When
inlining the expected behavior is that the function will return the
address of the function that will be returned to. To work around
this behavior use the 'noinline' function attribute.
The LEVEL argument must be a constant integer.
On some machines it may be impossible to determine the return
address of any function other than the current one; in such cases,
or when the top of the stack has been reached, this function will
return '0' or a random value. In addition,
'__builtin_frame_address' may be used to determine if the top of
the stack has been reached.
This function should only be used with a nonzero argument for
debugging purposes.
-- Built-in Function: void * __builtin_frame_address (unsigned int
LEVEL)
This function is similar to '__builtin_return_address', but it
returns the address of the function frame rather than the return
address of the function. Calling '__builtin_frame_address' with a
value of '0' yields the frame address of the current function, a
value of '1' yields the frame address of the caller of the current
function, and so forth.
The frame is the area on the stack which holds local variables and
saved registers. The frame address is normally the address of the
first word pushed on to the stack by the function. However, the
exact definition depends upon the processor and the calling
convention. If the processor has a dedicated frame pointer
register, and the function has a frame, then
'__builtin_frame_address' will return the value of the frame
pointer register.
On some machines it may be impossible to determine the frame
address of any function other than the current one; in such cases,
or when the top of the stack has been reached, this function will
return '0' if the first frame pointer is properly initialized by
the startup code.
This function should only be used with a nonzero argument for
debugging purposes.

File: gcc.info, Node: Vector Extensions, Next: Offsetof, Prev: Return Address, Up: C Extensions
5.45 Using vector instructions through built-in functions
=========================================================
On some targets, the instruction set contains SIMD vector instructions
that operate on multiple values contained in one large register at the
same time. For example, on the i386 the MMX, 3Dnow! and SSE extensions
can be used this way.
The first step in using these extensions is to provide the necessary
data types. This should be done using an appropriate 'typedef':
typedef int v4si __attribute__ ((vector_size (16)));
The 'int' type specifies the base type, while the attribute specifies
the vector size for the variable, measured in bytes. For example, the
declaration above causes the compiler to set the mode for the 'v4si'
type to be 16 bytes wide and divided into 'int' sized units. For a
32-bit 'int' this means a vector of 4 units of 4 bytes, and the
corresponding mode of 'foo' will be V4SI.
The 'vector_size' attribute is only applicable to integral and float
scalars, although arrays, pointers, and function return values are
allowed in conjunction with this construct.
All the basic integer types can be used as base types, both as signed
and as unsigned: 'char', 'short', 'int', 'long', 'long long'. In
addition, 'float' and 'double' can be used to build floating-point
vector types.
Specifying a combination that is not valid for the current architecture
will cause GCC to synthesize the instructions using a narrower mode.
For example, if you specify a variable of type 'V4SI' and your
architecture does not allow for this specific SIMD type, GCC will
produce code that uses 4 'SIs'.
The types defined in this manner can be used with a subset of normal C
operations. Currently, GCC will allow using the following operators on
these types: '+, -, *, /, unary minus, ^, |, &, ~'.
The operations behave like C++ 'valarrays'. Addition is defined as the
addition of the corresponding elements of the operands. For example, in
the code below, each of the 4 elements in A will be added to the
corresponding 4 elements in B and the resulting vector will be stored in
C.
typedef int v4si __attribute__ ((vector_size (16)));
v4si a, b, c;
c = a + b;
Subtraction, multiplication, division, and the logical operations
operate in a similar manner. Likewise, the result of using the unary
minus or complement operators on a vector type is a vector whose
elements are the negative or complemented values of the corresponding
elements in the operand.
You can declare variables and use them in function calls and returns,
as well as in assignments and some casts. You can specify a vector type
as a return type for a function. Vector types can also be used as
function arguments. It is possible to cast from one vector type to
another, provided they are of the same size (in fact, you can also cast
vectors to and from other datatypes of the same size).
You cannot operate between vectors of different lengths or different
signedness without a cast.
A port that supports hardware vector operations, usually provides a set
of built-in functions that can be used to operate on vectors. For
example, a function to add two vectors and multiply the result by a
third could look like this:
v4si f (v4si a, v4si b, v4si c)
{
v4si tmp = __builtin_addv4si (a, b);
return __builtin_mulv4si (tmp, c);
}

File: gcc.info, Node: Offsetof, Next: Atomic Builtins, Prev: Vector Extensions, Up: C Extensions
5.46 Offsetof
=============
GCC implements for both C and C++ a syntactic extension to implement the
'offsetof' macro.
primary:
"__builtin_offsetof" "(" typename "," offsetof_member_designator ")"
offsetof_member_designator:
identifier
| offsetof_member_designator "." identifier
| offsetof_member_designator "[" expr "]"
This extension is sufficient such that
#define offsetof(TYPE, MEMBER) __builtin_offsetof (TYPE, MEMBER)
is a suitable definition of the 'offsetof' macro. In C++, TYPE may be
dependent. In either case, MEMBER may consist of a single identifier,
or a sequence of member accesses and array references.

File: gcc.info, Node: Atomic Builtins, Next: Object Size Checking, Prev: Offsetof, Up: C Extensions
5.47 Built-in functions for atomic memory access
================================================
The following builtins are intended to be compatible with those
described in the 'Intel Itanium Processor-specific Application Binary
Interface', section 7.4. As such, they depart from the normal GCC
practice of using the "__builtin_" prefix, and further that they are
overloaded such that they work on multiple types.
The definition given in the Intel documentation allows only for the use
of the types 'int', 'long', 'long long' as well as their unsigned
counterparts. GCC will allow any integral scalar or pointer type that
is 1, 2, 4 or 8 bytes in length.
Not all operations are supported by all target processors. If a
particular operation cannot be implemented on the target processor, a
warning will be generated and a call an external function will be
generated. The external function will carry the same name as the
builtin, with an additional suffix '_N' where N is the size of the data
type.
In most cases, these builtins are considered a "full barrier". That
is, no memory operand will be moved across the operation, either forward
or backward. Further, instructions will be issued as necessary to
prevent the processor from speculating loads across the operation and
from queuing stores after the operation.
All of the routines are are described in the Intel documentation to
take "an optional list of variables protected by the memory barrier".
It's not clear what is meant by that; it could mean that _only_ the
following variables are protected, or it could mean that these variables
should in addition be protected. At present GCC ignores this list and
protects all variables which are globally accessible. If in the future
we make some use of this list, an empty list will continue to mean all
globally accessible variables.
'TYPE __sync_fetch_and_add (TYPE *ptr, TYPE value, ...)'
'TYPE __sync_fetch_and_sub (TYPE *ptr, TYPE value, ...)'
'TYPE __sync_fetch_and_or (TYPE *ptr, TYPE value, ...)'
'TYPE __sync_fetch_and_and (TYPE *ptr, TYPE value, ...)'
'TYPE __sync_fetch_and_xor (TYPE *ptr, TYPE value, ...)'
'TYPE __sync_fetch_and_nand (TYPE *ptr, TYPE value, ...)'
These builtins perform the operation suggested by the name, and
returns the value that had previously been in memory. That is,
{ tmp = *ptr; *ptr OP= value; return tmp; }
{ tmp = *ptr; *ptr = ~tmp & value; return tmp; } // nand
'TYPE __sync_add_and_fetch (TYPE *ptr, TYPE value, ...)'
'TYPE __sync_sub_and_fetch (TYPE *ptr, TYPE value, ...)'
'TYPE __sync_or_and_fetch (TYPE *ptr, TYPE value, ...)'
'TYPE __sync_and_and_fetch (TYPE *ptr, TYPE value, ...)'
'TYPE __sync_xor_and_fetch (TYPE *ptr, TYPE value, ...)'
'TYPE __sync_nand_and_fetch (TYPE *ptr, TYPE value, ...)'
These builtins perform the operation suggested by the name, and
return the new value. That is,
{ *ptr OP= value; return *ptr; }
{ *ptr = ~*ptr & value; return *ptr; } // nand
'bool __sync_bool_compare_and_swap (TYPE *ptr, TYPE oldval TYPE newval, ...)'
'TYPE __sync_val_compare_and_swap (TYPE *ptr, TYPE oldval TYPE newval, ...)'
These builtins perform an atomic compare and swap. That is, if the
current value of '*PTR' is OLDVAL, then write NEWVAL into '*PTR'.
The "bool" version returns true if the comparison is successful and
NEWVAL was written. The "val" version returns the contents of
'*PTR' before the operation.
'__sync_synchronize (...)'
This builtin issues a full memory barrier.
'TYPE __sync_lock_test_and_set (TYPE *ptr, TYPE value, ...)'
This builtin, as described by Intel, is not a traditional
test-and-set operation, but rather an atomic exchange operation.
It writes VALUE into '*PTR', and returns the previous contents of
'*PTR'.
Many targets have only minimal support for such locks, and do not
support a full exchange operation. In this case, a target may
support reduced functionality here by which the _only_ valid value
to store is the immediate constant 1. The exact value actually
stored in '*PTR' is implementation defined.
This builtin is not a full barrier, but rather an "acquire
barrier". This means that references after the builtin cannot move
to (or be speculated to) before the builtin, but previous memory
stores may not be globally visible yet, and previous memory loads
may not yet be satisfied.
'void __sync_lock_release (TYPE *ptr, ...)'
This builtin releases the lock acquired by
'__sync_lock_test_and_set'. Normally this means writing the
constant 0 to '*PTR'.
This builtin is not a full barrier, but rather a "release barrier".
This means that all previous memory stores are globally visible,
and all previous memory loads have been satisfied, but following
memory reads are not prevented from being speculated to before the
barrier.

File: gcc.info, Node: Object Size Checking, Next: Other Builtins, Prev: Atomic Builtins, Up: C Extensions
5.48 Object Size Checking Builtins
==================================
GCC implements a limited buffer overflow protection mechanism that can
prevent some buffer overflow attacks.
-- Built-in Function: size_t __builtin_object_size (void * PTR, int
TYPE)
is a built-in construct that returns a constant number of bytes
from PTR to the end of the object PTR pointer points to (if known
at compile time). '__builtin_object_size' never evaluates its
arguments for side-effects. If there are any side-effects in them,
it returns '(size_t) -1' for TYPE 0 or 1 and '(size_t) 0' for TYPE
2 or 3. If there are multiple objects PTR can point to and all of
them are known at compile time, the returned number is the maximum
of remaining byte counts in those objects if TYPE & 2 is 0 and
minimum if nonzero. If it is not possible to determine which
objects PTR points to at compile time, '__builtin_object_size'
should return '(size_t) -1' for TYPE 0 or 1 and '(size_t) 0' for
TYPE 2 or 3.
TYPE is an integer constant from 0 to 3. If the least significant
bit is clear, objects are whole variables, if it is set, a closest
surrounding subobject is considered the object a pointer points to.
The second bit determines if maximum or minimum of remaining bytes
is computed.
struct V { char buf1[10]; int b; char buf2[10]; } var;
char *p = &var.buf1[1], *q = &var.b;
/* Here the object p points to is var. */
assert (__builtin_object_size (p, 0) == sizeof (var) - 1);
/* The subobject p points to is var.buf1. */
assert (__builtin_object_size (p, 1) == sizeof (var.buf1) - 1);
/* The object q points to is var. */
assert (__builtin_object_size (q, 0)
== (char *) (&var + 1) - (char *) &var.b);
/* The subobject q points to is var.b. */
assert (__builtin_object_size (q, 1) == sizeof (var.b));
There are built-in functions added for many common string operation
functions, e.g., for 'memcpy' '__builtin___memcpy_chk' built-in is
provided. This built-in has an additional last argument, which is the
number of bytes remaining in object the DEST argument points to or
'(size_t) -1' if the size is not known.
The built-in functions are optimized into the normal string functions
like 'memcpy' if the last argument is '(size_t) -1' or if it is known at
compile time that the destination object will not be overflown. If the
compiler can determine at compile time the object will be always
overflown, it issues a warning.
The intended use can be e.g.
#undef memcpy
#define bos0(dest) __builtin_object_size (dest, 0)
#define memcpy(dest, src, n) \
__builtin___memcpy_chk (dest, src, n, bos0 (dest))
char *volatile p;
char buf[10];
/* It is unknown what object p points to, so this is optimized
into plain memcpy - no checking is possible. */
memcpy (p, "abcde", n);
/* Destination is known and length too. It is known at compile
time there will be no overflow. */
memcpy (&buf[5], "abcde", 5);
/* Destination is known, but the length is not known at compile time.
This will result in __memcpy_chk call that can check for overflow
at runtime. */
memcpy (&buf[5], "abcde", n);
/* Destination is known and it is known at compile time there will
be overflow. There will be a warning and __memcpy_chk call that
will abort the program at runtime. */
memcpy (&buf[6], "abcde", 5);
Such built-in functions are provided for 'memcpy', 'mempcpy',
'memmove', 'memset', 'strcpy', 'stpcpy', 'strncpy', 'strcat' and
'strncat'.
There are also checking built-in functions for formatted output
functions.
int __builtin___sprintf_chk (char *s, int flag, size_t os, const char *fmt, ...);
int __builtin___snprintf_chk (char *s, size_t maxlen, int flag, size_t os,
const char *fmt, ...);
int __builtin___vsprintf_chk (char *s, int flag, size_t os, const char *fmt,
va_list ap);
int __builtin___vsnprintf_chk (char *s, size_t maxlen, int flag, size_t os,
const char *fmt, va_list ap);
The added FLAG argument is passed unchanged to '__sprintf_chk' etc.
functions and can contain implementation specific flags on what
additional security measures the checking function might take, such as
handling '%n' differently.
The OS argument is the object size S points to, like in the other
built-in functions. There is a small difference in the behavior though,
if OS is '(size_t) -1', the built-in functions are optimized into the
non-checking functions only if FLAG is 0, otherwise the checking
function is called with OS argument set to '(size_t) -1'.
In addition to this, there are checking built-in functions
'__builtin___printf_chk', '__builtin___vprintf_chk',
'__builtin___fprintf_chk' and '__builtin___vfprintf_chk'. These have
just one additional argument, FLAG, right before format string FMT. If
the compiler is able to optimize them to 'fputc' etc. functions, it
will, otherwise the checking function should be called and the FLAG
argument passed to it.

File: gcc.info, Node: Other Builtins, Next: Target Builtins, Prev: Object Size Checking, Up: C Extensions
5.49 Other built-in functions provided by GCC
=============================================
GCC provides a large number of built-in functions other than the ones
mentioned above. Some of these are for internal use in the processing
of exceptions or variable-length argument lists and will not be
documented here because they may change from time to time; we do not
recommend general use of these functions.
The remaining functions are provided for optimization purposes.
GCC includes built-in versions of many of the functions in the standard
C library. The versions prefixed with '__builtin_' will always be
treated as having the same meaning as the C library function even if you
specify the '-fno-builtin' option. (*note C Dialect Options::) Many of
these functions are only optimized in certain cases; if they are not
optimized in a particular case, a call to the library function will be
emitted.
Outside strict ISO C mode ('-ansi', '-std=c89' or '-std=c99'), the
functions '_exit', 'alloca', 'bcmp', 'bzero', 'dcgettext', 'dgettext',
'dremf', 'dreml', 'drem', 'exp10f', 'exp10l', 'exp10', 'ffsll', 'ffsl',
'ffs', 'fprintf_unlocked', 'fputs_unlocked', 'gammaf', 'gammal',
'gamma', 'gammaf_r', 'gammal_r', 'gamma_r', 'gettext', 'index',
'isascii', 'j0f', 'j0l', 'j0', 'j1f', 'j1l', 'j1', 'jnf', 'jnl', 'jn',
'lgammaf_r', 'lgammal_r', 'lgamma_r', 'mempcpy', 'pow10f', 'pow10l',
'pow10', 'printf_unlocked', 'rindex', 'scalbf', 'scalbl', 'scalb',
'signbit', 'signbitf', 'signbitl', 'signbitd32', 'signbitd64',
'signbitd128', 'significandf', 'significandl', 'significand', 'sincosf',
'sincosl', 'sincos', 'stpcpy', 'stpncpy', 'strcasecmp', 'strdup',
'strfmon', 'strncasecmp', 'strndup', 'toascii', 'y0f', 'y0l', 'y0',
'y1f', 'y1l', 'y1', 'ynf', 'ynl' and 'yn' may be handled as built-in
functions. All these functions have corresponding versions prefixed
with '__builtin_', which may be used even in strict C89 mode.
The ISO C99 functions '_Exit', 'acoshf', 'acoshl', 'acosh', 'asinhf',
'asinhl', 'asinh', 'atanhf', 'atanhl', 'atanh', 'cabsf', 'cabsl',
'cabs', 'cacosf', 'cacoshf', 'cacoshl', 'cacosh', 'cacosl', 'cacos',
'cargf', 'cargl', 'carg', 'casinf', 'casinhf', 'casinhl', 'casinh',
'casinl', 'casin', 'catanf', 'catanhf', 'catanhl', 'catanh', 'catanl',
'catan', 'cbrtf', 'cbrtl', 'cbrt', 'ccosf', 'ccoshf', 'ccoshl', 'ccosh',
'ccosl', 'ccos', 'cexpf', 'cexpl', 'cexp', 'cimagf', 'cimagl', 'cimag',
'clogf', 'clogl', 'clog', 'conjf', 'conjl', 'conj', 'copysignf',
'copysignl', 'copysign', 'cpowf', 'cpowl', 'cpow', 'cprojf', 'cprojl',
'cproj', 'crealf', 'creall', 'creal', 'csinf', 'csinhf', 'csinhl',
'csinh', 'csinl', 'csin', 'csqrtf', 'csqrtl', 'csqrt', 'ctanf',
'ctanhf', 'ctanhl', 'ctanh', 'ctanl', 'ctan', 'erfcf', 'erfcl', 'erfc',
'erff', 'erfl', 'erf', 'exp2f', 'exp2l', 'exp2', 'expm1f', 'expm1l',
'expm1', 'fdimf', 'fdiml', 'fdim', 'fmaf', 'fmal', 'fmaxf', 'fmaxl',
'fmax', 'fma', 'fminf', 'fminl', 'fmin', 'hypotf', 'hypotl', 'hypot',
'ilogbf', 'ilogbl', 'ilogb', 'imaxabs', 'isblank', 'iswblank',
'lgammaf', 'lgammal', 'lgamma', 'llabs', 'llrintf', 'llrintl', 'llrint',
'llroundf', 'llroundl', 'llround', 'log1pf', 'log1pl', 'log1p', 'log2f',
'log2l', 'log2', 'logbf', 'logbl', 'logb', 'lrintf', 'lrintl', 'lrint',
'lroundf', 'lroundl', 'lround', 'nearbyintf', 'nearbyintl', 'nearbyint',
'nextafterf', 'nextafterl', 'nextafter', 'nexttowardf', 'nexttowardl',
'nexttoward', 'remainderf', 'remainderl', 'remainder', 'remquof',
'remquol', 'remquo', 'rintf', 'rintl', 'rint', 'roundf', 'roundl',
'round', 'scalblnf', 'scalblnl', 'scalbln', 'scalbnf', 'scalbnl',
'scalbn', 'snprintf', 'tgammaf', 'tgammal', 'tgamma', 'truncf',
'truncl', 'trunc', 'vfscanf', 'vscanf', 'vsnprintf' and 'vsscanf' are
handled as built-in functions except in strict ISO C90 mode ('-ansi' or
'-std=c89').
There are also built-in versions of the ISO C99 functions 'acosf',
'acosl', 'asinf', 'asinl', 'atan2f', 'atan2l', 'atanf', 'atanl',
'ceilf', 'ceill', 'cosf', 'coshf', 'coshl', 'cosl', 'expf', 'expl',
'fabsf', 'fabsl', 'floorf', 'floorl', 'fmodf', 'fmodl', 'frexpf',
'frexpl', 'ldexpf', 'ldexpl', 'log10f', 'log10l', 'logf', 'logl',
'modfl', 'modf', 'powf', 'powl', 'sinf', 'sinhf', 'sinhl', 'sinl',
'sqrtf', 'sqrtl', 'tanf', 'tanhf', 'tanhl' and 'tanl' that are
recognized in any mode since ISO C90 reserves these names for the
purpose to which ISO C99 puts them. All these functions have
corresponding versions prefixed with '__builtin_'.
The ISO C94 functions 'iswalnum', 'iswalpha', 'iswcntrl', 'iswdigit',
'iswgraph', 'iswlower', 'iswprint', 'iswpunct', 'iswspace', 'iswupper',
'iswxdigit', 'towlower' and 'towupper' are handled as built-in functions
except in strict ISO C90 mode ('-ansi' or '-std=c89').
The ISO C90 functions 'abort', 'abs', 'acos', 'asin', 'atan2', 'atan',
'calloc', 'ceil', 'cosh', 'cos', 'exit', 'exp', 'fabs', 'floor', 'fmod',
'fprintf', 'fputs', 'frexp', 'fscanf', 'isalnum', 'isalpha', 'iscntrl',
'isdigit', 'isgraph', 'islower', 'isprint', 'ispunct', 'isspace',
'isupper', 'isxdigit', 'tolower', 'toupper', 'labs', 'ldexp', 'log10',
'log', 'malloc', 'memchr', 'memcmp', 'memcpy', 'memset', 'modf', 'pow',
'printf', 'putchar', 'puts', 'scanf', 'sinh', 'sin', 'snprintf',
'sprintf', 'sqrt', 'sscanf', 'strcat', 'strchr', 'strcmp', 'strcpy',
'strcspn', 'strlen', 'strncat', 'strncmp', 'strncpy', 'strpbrk',
'strrchr', 'strspn', 'strstr', 'tanh', 'tan', 'vfprintf', 'vprintf' and
'vsprintf' are all recognized as built-in functions unless
'-fno-builtin' is specified (or '-fno-builtin-FUNCTION' is specified for
an individual function). All of these functions have corresponding
versions prefixed with '__builtin_'.
GCC provides built-in versions of the ISO C99 floating point comparison
macros that avoid raising exceptions for unordered operands. They have
the same names as the standard macros ( 'isgreater', 'isgreaterequal',
'isless', 'islessequal', 'islessgreater', and 'isunordered') , with
'__builtin_' prefixed. We intend for a library implementor to be able
to simply '#define' each standard macro to its built-in equivalent. In
the same fashion, GCC provides 'isfinite' and 'isnormal' built-ins used
with '__builtin_' prefixed.
-- Built-in Function: int __builtin_types_compatible_p (TYPE1, TYPE2)
You can use the built-in function '__builtin_types_compatible_p' to
determine whether two types are the same.
This built-in function returns 1 if the unqualified versions of the
types TYPE1 and TYPE2 (which are types, not expressions) are
compatible, 0 otherwise. The result of this built-in function can
be used in integer constant expressions.
This built-in function ignores top level qualifiers (e.g., 'const',
'volatile'). For example, 'int' is equivalent to 'const int'.
The type 'int[]' and 'int[5]' are compatible. On the other hand,
'int' and 'char *' are not compatible, even if the size of their
types, on the particular architecture are the same. Also, the
amount of pointer indirection is taken into account when
determining similarity. Consequently, 'short *' is not similar to
'short **'. Furthermore, two types that are typedefed are
considered compatible if their underlying types are compatible.
An 'enum' type is not considered to be compatible with another
'enum' type even if both are compatible with the same integer type;
this is what the C standard specifies. For example, 'enum {foo,
bar}' is not similar to 'enum {hot, dog}'.
You would typically use this function in code whose execution
varies depending on the arguments' types. For example:
#define foo(x) \
({ \
typeof (x) tmp = (x); \
if (__builtin_types_compatible_p (typeof (x), long double)) \
tmp = foo_long_double (tmp); \
else if (__builtin_types_compatible_p (typeof (x), double)) \
tmp = foo_double (tmp); \
else if (__builtin_types_compatible_p (typeof (x), float)) \
tmp = foo_float (tmp); \
else \
abort (); \
tmp; \
})
_Note:_ This construct is only available for C.
-- Built-in Function: TYPE __builtin_choose_expr (CONST_EXP, EXP1,
EXP2)
You can use the built-in function '__builtin_choose_expr' to
evaluate code depending on the value of a constant expression.
This built-in function returns EXP1 if CONST_EXP, which is a
constant expression that must be able to be determined at compile
time, is nonzero. Otherwise it returns 0.
This built-in function is analogous to the '? :' operator in C,
except that the expression returned has its type unaltered by
promotion rules. Also, the built-in function does not evaluate the
expression that was not chosen. For example, if CONST_EXP
evaluates to true, EXP2 is not evaluated even if it has
side-effects.
This built-in function can return an lvalue if the chosen argument
is an lvalue.
If EXP1 is returned, the return type is the same as EXP1's type.
Similarly, if EXP2 is returned, its return type is the same as
EXP2.
Example:
#define foo(x) \
__builtin_choose_expr ( \
__builtin_types_compatible_p (typeof (x), double), \
foo_double (x), \
__builtin_choose_expr ( \
__builtin_types_compatible_p (typeof (x), float), \
foo_float (x), \
/* The void expression results in a compile-time error \
when assigning the result to something. */ \
(void)0))
_Note:_ This construct is only available for C. Furthermore, the
unused expression (EXP1 or EXP2 depending on the value of
CONST_EXP) may still generate syntax errors. This may change in
future revisions.
-- Built-in Function: int __builtin_constant_p (EXP)
You can use the built-in function '__builtin_constant_p' to
determine if a value is known to be constant at compile-time and
hence that GCC can perform constant-folding on expressions
involving that value. The argument of the function is the value to
test. The function returns the integer 1 if the argument is known
to be a compile-time constant and 0 if it is not known to be a
compile-time constant. A return of 0 does not indicate that the
value is _not_ a constant, but merely that GCC cannot prove it is a
constant with the specified value of the '-O' option.
You would typically use this function in an embedded application
where memory was a critical resource. If you have some complex
calculation, you may want it to be folded if it involves constants,
but need to call a function if it does not. For example:
#define Scale_Value(X) \
(__builtin_constant_p (X) \
? ((X) * SCALE + OFFSET) : Scale (X))
You may use this built-in function in either a macro or an inline
function. However, if you use it in an inlined function and pass
an argument of the function as the argument to the built-in, GCC
will never return 1 when you call the inline function with a string
constant or compound literal (*note Compound Literals::) and will
not return 1 when you pass a constant numeric value to the inline
function unless you specify the '-O' option.
You may also use '__builtin_constant_p' in initializers for static
data. For instance, you can write
static const int table[] = {
__builtin_constant_p (EXPRESSION) ? (EXPRESSION) : -1,
/* ... */
};
This is an acceptable initializer even if EXPRESSION is not a
constant expression. GCC must be more conservative about
evaluating the built-in in this case, because it has no opportunity
to perform optimization.
Previous versions of GCC did not accept this built-in in data
initializers. The earliest version where it is completely safe is
3.0.1.
-- Built-in Function: long __builtin_expect (long EXP, long C)
You may use '__builtin_expect' to provide the compiler with branch
prediction information. In general, you should prefer to use
actual profile feedback for this ('-fprofile-arcs'), as programmers
are notoriously bad at predicting how their programs actually
perform. However, there are applications in which this data is
hard to collect.
The return value is the value of EXP, which should be an integral
expression. The semantics of the built-in are that it is expected
that EXP == C. For example:
if (__builtin_expect (x, 0))
foo ();
would indicate that we do not expect to call 'foo', since we expect
'x' to be zero. Since you are limited to integral expressions for
EXP, you should use constructions such as
if (__builtin_expect (ptr != NULL, 1))
error ();
when testing pointer or floating-point values.
-- Built-in Function: void __builtin_trap (void)
This function causes the program to exit abnormally. GCC
implements this function by using a target-dependent mechanism
(such as intentionally executing an illegal instruction) or by
calling 'abort'. The mechanism used may vary from release to
release so you should not rely on any particular implementation.
-- Built-in Function: void __builtin___clear_cache (char *BEGIN, char
*END)
This function is used to flush the processor's instruction cache
for the region of memory between BEGIN inclusive and END exclusive.
Some targets require that the instruction cache be flushed, after
modifying memory containing code, in order to obtain deterministic
behavior.
If the target does not require instruction cache flushes,
'__builtin___clear_cache' has no effect. Otherwise either
instructions are emitted in-line to clear the instruction cache or
a call to the '__clear_cache' function in libgcc is made.
-- Built-in Function: void __builtin_prefetch (const void *ADDR, ...)
This function is used to minimize cache-miss latency by moving data
into a cache before it is accessed. You can insert calls to
'__builtin_prefetch' into code for which you know addresses of data
in memory that is likely to be accessed soon. If the target
supports them, data prefetch instructions will be generated. If
the prefetch is done early enough before the access then the data
will be in the cache by the time it is accessed.
The value of ADDR is the address of the memory to prefetch. There
are two optional arguments, RW and LOCALITY. The value of RW is a
compile-time constant one or zero; one means that the prefetch is
preparing for a write to the memory address and zero, the default,
means that the prefetch is preparing for a read. The value
LOCALITY must be a compile-time constant integer between zero and
three. A value of zero means that the data has no temporal
locality, so it need not be left in the cache after the access. A
value of three means that the data has a high degree of temporal
locality and should be left in all levels of cache possible.
Values of one and two mean, respectively, a low or moderate degree
of temporal locality. The default is three.
for (i = 0; i < n; i++)
{
a[i] = a[i] + b[i];
__builtin_prefetch (&a[i+j], 1, 1);
__builtin_prefetch (&b[i+j], 0, 1);
/* ... */
}
Data prefetch does not generate faults if ADDR is invalid, but the
address expression itself must be valid. For example, a prefetch
of 'p->next' will not fault if 'p->next' is not a valid address,
but evaluation will fault if 'p' is not a valid address.
If the target does not support data prefetch, the address
expression is evaluated if it includes side effects but no other
code is generated and GCC does not issue a warning.
-- Built-in Function: double __builtin_huge_val (void)
Returns a positive infinity, if supported by the floating-point
format, else 'DBL_MAX'. This function is suitable for implementing
the ISO C macro 'HUGE_VAL'.
-- Built-in Function: float __builtin_huge_valf (void)
Similar to '__builtin_huge_val', except the return type is 'float'.
-- Built-in Function: long double __builtin_huge_vall (void)
Similar to '__builtin_huge_val', except the return type is 'long
double'.
-- Built-in Function: double __builtin_inf (void)
Similar to '__builtin_huge_val', except a warning is generated if
the target floating-point format does not support infinities.
-- Built-in Function: _Decimal32 __builtin_infd32 (void)
Similar to '__builtin_inf', except the return type is '_Decimal32'.
-- Built-in Function: _Decimal64 __builtin_infd64 (void)
Similar to '__builtin_inf', except the return type is '_Decimal64'.
-- Built-in Function: _Decimal128 __builtin_infd128 (void)
Similar to '__builtin_inf', except the return type is
'_Decimal128'.
-- Built-in Function: float __builtin_inff (void)
Similar to '__builtin_inf', except the return type is 'float'.
This function is suitable for implementing the ISO C99 macro
'INFINITY'.
-- Built-in Function: long double __builtin_infl (void)
Similar to '__builtin_inf', except the return type is 'long
double'.
-- Built-in Function: double __builtin_nan (const char *str)
This is an implementation of the ISO C99 function 'nan'.
Since ISO C99 defines this function in terms of 'strtod', which we
do not implement, a description of the parsing is in order. The
string is parsed as by 'strtol'; that is, the base is recognized by
leading '0' or '0x' prefixes. The number parsed is placed in the
significand such that the least significant bit of the number is at
the least significant bit of the significand. The number is
truncated to fit the significand field provided. The significand
is forced to be a quiet NaN.
This function, if given a string literal all of which would have
been consumed by strtol, is evaluated early enough that it is
considered a compile-time constant.
-- Built-in Function: _Decimal32 __builtin_nand32 (const char *str)
Similar to '__builtin_nan', except the return type is '_Decimal32'.
-- Built-in Function: _Decimal64 __builtin_nand64 (const char *str)
Similar to '__builtin_nan', except the return type is '_Decimal64'.
-- Built-in Function: _Decimal128 __builtin_nand128 (const char *str)
Similar to '__builtin_nan', except the return type is
'_Decimal128'.
-- Built-in Function: float __builtin_nanf (const char *str)
Similar to '__builtin_nan', except the return type is 'float'.
-- Built-in Function: long double __builtin_nanl (const char *str)
Similar to '__builtin_nan', except the return type is 'long
double'.
-- Built-in Function: double __builtin_nans (const char *str)
Similar to '__builtin_nan', except the significand is forced to be
a signaling NaN. The 'nans' function is proposed by WG14 N965.
-- Built-in Function: float __builtin_nansf (const char *str)
Similar to '__builtin_nans', except the return type is 'float'.
-- Built-in Function: long double __builtin_nansl (const char *str)
Similar to '__builtin_nans', except the return type is 'long
double'.
-- Built-in Function: int __builtin_ffs (unsigned int x)
Returns one plus the index of the least significant 1-bit of X, or
if X is zero, returns zero.
-- Built-in Function: int __builtin_clz (unsigned int x)
Returns the number of leading 0-bits in X, starting at the most
significant bit position. If X is 0, the result is undefined.
-- Built-in Function: int __builtin_ctz (unsigned int x)
Returns the number of trailing 0-bits in X, starting at the least
significant bit position. If X is 0, the result is undefined.
-- Built-in Function: int __builtin_popcount (unsigned int x)
Returns the number of 1-bits in X.
-- Built-in Function: int __builtin_parity (unsigned int x)
Returns the parity of X, i.e. the number of 1-bits in X modulo 2.
-- Built-in Function: int __builtin_ffsl (unsigned long)
Similar to '__builtin_ffs', except the argument type is 'unsigned
long'.
-- Built-in Function: int __builtin_clzl (unsigned long)
Similar to '__builtin_clz', except the argument type is 'unsigned
long'.
-- Built-in Function: int __builtin_ctzl (unsigned long)
Similar to '__builtin_ctz', except the argument type is 'unsigned
long'.
-- Built-in Function: int __builtin_popcountl (unsigned long)
Similar to '__builtin_popcount', except the argument type is
'unsigned long'.
-- Built-in Function: int __builtin_parityl (unsigned long)
Similar to '__builtin_parity', except the argument type is
'unsigned long'.
-- Built-in Function: int __builtin_ffsll (unsigned long long)
Similar to '__builtin_ffs', except the argument type is 'unsigned
long long'.
-- Built-in Function: int __builtin_clzll (unsigned long long)
Similar to '__builtin_clz', except the argument type is 'unsigned
long long'.
-- Built-in Function: int __builtin_ctzll (unsigned long long)
Similar to '__builtin_ctz', except the argument type is 'unsigned
long long'.
-- Built-in Function: int __builtin_popcountll (unsigned long long)
Similar to '__builtin_popcount', except the argument type is
'unsigned long long'.
-- Built-in Function: int __builtin_parityll (unsigned long long)
Similar to '__builtin_parity', except the argument type is
'unsigned long long'.
-- Built-in Function: double __builtin_powi (double, int)
Returns the first argument raised to the power of the second.
Unlike the 'pow' function no guarantees about precision and
rounding are made.
-- Built-in Function: float __builtin_powif (float, int)
Similar to '__builtin_powi', except the argument and return types
are 'float'.
-- Built-in Function: long double __builtin_powil (long double, int)
Similar to '__builtin_powi', except the argument and return types
are 'long double'.
-- Built-in Function: int32_t __builtin_bswap32 (int32_t x)
Returns X with the order of the bytes reversed; for example,
'0xaabbccdd' becomes '0xddccbbaa'. Byte here always means exactly
8 bits.
-- Built-in Function: int64_t __builtin_bswap64 (int64_t x)
Similar to '__builtin_bswap32', except the argument and return
types are 64-bit.

File: gcc.info, Node: Target Builtins, Next: Target Format Checks, Prev: Other Builtins, Up: C Extensions
5.50 Built-in Functions Specific to Particular Target Machines
==============================================================
On some target machines, GCC supports many built-in functions specific
to those machines. Generally these generate calls to specific machine
instructions, but allow the compiler to schedule those calls.
* Menu:
* Alpha Built-in Functions::
* ARM iWMMXt Built-in Functions::
* ARM NEON Intrinsics::
* Blackfin Built-in Functions::
* FR-V Built-in Functions::
* X86 Built-in Functions::
* MIPS DSP Built-in Functions::
* MIPS Paired-Single Support::
* PowerPC AltiVec Built-in Functions::
* SPARC VIS Built-in Functions::
* SPU Built-in Functions::

File: gcc.info, Node: Alpha Built-in Functions, Next: ARM iWMMXt Built-in Functions, Up: Target Builtins
5.50.1 Alpha Built-in Functions
-------------------------------
These built-in functions are available for the Alpha family of
processors, depending on the command-line switches used.
The following built-in functions are always available. They all
generate the machine instruction that is part of the name.
long __builtin_alpha_implver (void)
long __builtin_alpha_rpcc (void)
long __builtin_alpha_amask (long)
long __builtin_alpha_cmpbge (long, long)
long __builtin_alpha_extbl (long, long)
long __builtin_alpha_extwl (long, long)
long __builtin_alpha_extll (long, long)
long __builtin_alpha_extql (long, long)
long __builtin_alpha_extwh (long, long)
long __builtin_alpha_extlh (long, long)
long __builtin_alpha_extqh (long, long)
long __builtin_alpha_insbl (long, long)
long __builtin_alpha_inswl (long, long)
long __builtin_alpha_insll (long, long)
long __builtin_alpha_insql (long, long)
long __builtin_alpha_inswh (long, long)
long __builtin_alpha_inslh (long, long)
long __builtin_alpha_insqh (long, long)
long __builtin_alpha_mskbl (long, long)
long __builtin_alpha_mskwl (long, long)
long __builtin_alpha_mskll (long, long)
long __builtin_alpha_mskql (long, long)
long __builtin_alpha_mskwh (long, long)
long __builtin_alpha_msklh (long, long)
long __builtin_alpha_mskqh (long, long)
long __builtin_alpha_umulh (long, long)
long __builtin_alpha_zap (long, long)
long __builtin_alpha_zapnot (long, long)
The following built-in functions are always with '-mmax' or '-mcpu=CPU'
where CPU is 'pca56' or later. They all generate the machine
instruction that is part of the name.
long __builtin_alpha_pklb (long)
long __builtin_alpha_pkwb (long)
long __builtin_alpha_unpkbl (long)
long __builtin_alpha_unpkbw (long)
long __builtin_alpha_minub8 (long, long)
long __builtin_alpha_minsb8 (long, long)
long __builtin_alpha_minuw4 (long, long)
long __builtin_alpha_minsw4 (long, long)
long __builtin_alpha_maxub8 (long, long)
long __builtin_alpha_maxsb8 (long, long)
long __builtin_alpha_maxuw4 (long, long)
long __builtin_alpha_maxsw4 (long, long)
long __builtin_alpha_perr (long, long)
The following built-in functions are always with '-mcix' or '-mcpu=CPU'
where CPU is 'ev67' or later. They all generate the machine instruction
that is part of the name.
long __builtin_alpha_cttz (long)
long __builtin_alpha_ctlz (long)
long __builtin_alpha_ctpop (long)
The following builtins are available on systems that use the OSF/1
PALcode. Normally they invoke the 'rduniq' and 'wruniq' PAL calls, but
when invoked with '-mtls-kernel', they invoke 'rdval' and 'wrval'.
void *__builtin_thread_pointer (void)
void __builtin_set_thread_pointer (void *)

File: gcc.info, Node: ARM iWMMXt Built-in Functions, Next: ARM NEON Intrinsics, Prev: Alpha Built-in Functions, Up: Target Builtins
5.50.2 ARM iWMMXt Built-in Functions
------------------------------------
These built-in functions are available for the ARM family of processors
when the '-mcpu=iwmmxt' switch is used:
typedef int v2si __attribute__ ((vector_size (8)));
typedef short v4hi __attribute__ ((vector_size (8)));
typedef char v8qi __attribute__ ((vector_size (8)));
int __builtin_arm_getwcx (int)
void __builtin_arm_setwcx (int, int)
int __builtin_arm_textrmsb (v8qi, int)
int __builtin_arm_textrmsh (v4hi, int)
int __builtin_arm_textrmsw (v2si, int)
int __builtin_arm_textrmub (v8qi, int)
int __builtin_arm_textrmuh (v4hi, int)
int __builtin_arm_textrmuw (v2si, int)
v8qi __builtin_arm_tinsrb (v8qi, int)
v4hi __builtin_arm_tinsrh (v4hi, int)
v2si __builtin_arm_tinsrw (v2si, int)
long long __builtin_arm_tmia (long long, int, int)
long long __builtin_arm_tmiabb (long long, int, int)
long long __builtin_arm_tmiabt (long long, int, int)
long long __builtin_arm_tmiaph (long long, int, int)
long long __builtin_arm_tmiatb (long long, int, int)
long long __builtin_arm_tmiatt (long long, int, int)
int __builtin_arm_tmovmskb (v8qi)
int __builtin_arm_tmovmskh (v4hi)
int __builtin_arm_tmovmskw (v2si)
long long __builtin_arm_waccb (v8qi)
long long __builtin_arm_wacch (v4hi)
long long __builtin_arm_waccw (v2si)
v8qi __builtin_arm_waddb (v8qi, v8qi)
v8qi __builtin_arm_waddbss (v8qi, v8qi)
v8qi __builtin_arm_waddbus (v8qi, v8qi)
v4hi __builtin_arm_waddh (v4hi, v4hi)
v4hi __builtin_arm_waddhss (v4hi, v4hi)
v4hi __builtin_arm_waddhus (v4hi, v4hi)
v2si __builtin_arm_waddw (v2si, v2si)
v2si __builtin_arm_waddwss (v2si, v2si)
v2si __builtin_arm_waddwus (v2si, v2si)
v8qi __builtin_arm_walign (v8qi, v8qi, int)
long long __builtin_arm_wand(long long, long long)
long long __builtin_arm_wandn (long long, long long)
v8qi __builtin_arm_wavg2b (v8qi, v8qi)
v8qi __builtin_arm_wavg2br (v8qi, v8qi)
v4hi __builtin_arm_wavg2h (v4hi, v4hi)
v4hi __builtin_arm_wavg2hr (v4hi, v4hi)
v8qi __builtin_arm_wcmpeqb (v8qi, v8qi)
v4hi __builtin_arm_wcmpeqh (v4hi, v4hi)
v2si __builtin_arm_wcmpeqw (v2si, v2si)
v8qi __builtin_arm_wcmpgtsb (v8qi, v8qi)
v4hi __builtin_arm_wcmpgtsh (v4hi, v4hi)
v2si __builtin_arm_wcmpgtsw (v2si, v2si)
v8qi __builtin_arm_wcmpgtub (v8qi, v8qi)
v4hi __builtin_arm_wcmpgtuh (v4hi, v4hi)
v2si __builtin_arm_wcmpgtuw (v2si, v2si)
long long __builtin_arm_wmacs (long long, v4hi, v4hi)
long long __builtin_arm_wmacsz (v4hi, v4hi)
long long __builtin_arm_wmacu (long long, v4hi, v4hi)
long long __builtin_arm_wmacuz (v4hi, v4hi)
v4hi __builtin_arm_wmadds (v4hi, v4hi)
v4hi __builtin_arm_wmaddu (v4hi, v4hi)
v8qi __builtin_arm_wmaxsb (v8qi, v8qi)
v4hi __builtin_arm_wmaxsh (v4hi, v4hi)
v2si __builtin_arm_wmaxsw (v2si, v2si)
v8qi __builtin_arm_wmaxub (v8qi, v8qi)
v4hi __builtin_arm_wmaxuh (v4hi, v4hi)
v2si __builtin_arm_wmaxuw (v2si, v2si)
v8qi __builtin_arm_wminsb (v8qi, v8qi)
v4hi __builtin_arm_wminsh (v4hi, v4hi)
v2si __builtin_arm_wminsw (v2si, v2si)
v8qi __builtin_arm_wminub (v8qi, v8qi)
v4hi __builtin_arm_wminuh (v4hi, v4hi)
v2si __builtin_arm_wminuw (v2si, v2si)
v4hi __builtin_arm_wmulsm (v4hi, v4hi)
v4hi __builtin_arm_wmulul (v4hi, v4hi)
v4hi __builtin_arm_wmulum (v4hi, v4hi)
long long __builtin_arm_wor (long long, long long)
v2si __builtin_arm_wpackdss (long long, long long)
v2si __builtin_arm_wpackdus (long long, long long)
v8qi __builtin_arm_wpackhss (v4hi, v4hi)
v8qi __builtin_arm_wpackhus (v4hi, v4hi)
v4hi __builtin_arm_wpackwss (v2si, v2si)
v4hi __builtin_arm_wpackwus (v2si, v2si)
long long __builtin_arm_wrord (long long, long long)
long long __builtin_arm_wrordi (long long, int)
v4hi __builtin_arm_wrorh (v4hi, long long)
v4hi __builtin_arm_wrorhi (v4hi, int)
v2si __builtin_arm_wrorw (v2si, long long)
v2si __builtin_arm_wrorwi (v2si, int)
v2si __builtin_arm_wsadb (v8qi, v8qi)
v2si __builtin_arm_wsadbz (v8qi, v8qi)
v2si __builtin_arm_wsadh (v4hi, v4hi)
v2si __builtin_arm_wsadhz (v4hi, v4hi)
v4hi __builtin_arm_wshufh (v4hi, int)
long long __builtin_arm_wslld (long long, long long)
long long __builtin_arm_wslldi (long long, int)
v4hi __builtin_arm_wsllh (v4hi, long long)
v4hi __builtin_arm_wsllhi (v4hi, int)
v2si __builtin_arm_wsllw (v2si, long long)
v2si __builtin_arm_wsllwi (v2si, int)
long long __builtin_arm_wsrad (long long, long long)
long long __builtin_arm_wsradi (long long, int)
v4hi __builtin_arm_wsrah (v4hi, long long)
v4hi __builtin_arm_wsrahi (v4hi, int)
v2si __builtin_arm_wsraw (v2si, long long)
v2si __builtin_arm_wsrawi (v2si, int)
long long __builtin_arm_wsrld (long long, long long)
long long __builtin_arm_wsrldi (long long, int)
v4hi __builtin_arm_wsrlh (v4hi, long long)
v4hi __builtin_arm_wsrlhi (v4hi, int)
v2si __builtin_arm_wsrlw (v2si, long long)
v2si __builtin_arm_wsrlwi (v2si, int)
v8qi __builtin_arm_wsubb (v8qi, v8qi)
v8qi __builtin_arm_wsubbss (v8qi, v8qi)
v8qi __builtin_arm_wsubbus (v8qi, v8qi)
v4hi __builtin_arm_wsubh (v4hi, v4hi)
v4hi __builtin_arm_wsubhss (v4hi, v4hi)
v4hi __builtin_arm_wsubhus (v4hi, v4hi)
v2si __builtin_arm_wsubw (v2si, v2si)
v2si __builtin_arm_wsubwss (v2si, v2si)
v2si __builtin_arm_wsubwus (v2si, v2si)
v4hi __builtin_arm_wunpckehsb (v8qi)
v2si __builtin_arm_wunpckehsh (v4hi)
long long __builtin_arm_wunpckehsw (v2si)
v4hi __builtin_arm_wunpckehub (v8qi)
v2si __builtin_arm_wunpckehuh (v4hi)
long long __builtin_arm_wunpckehuw (v2si)
v4hi __builtin_arm_wunpckelsb (v8qi)
v2si __builtin_arm_wunpckelsh (v4hi)
long long __builtin_arm_wunpckelsw (v2si)
v4hi __builtin_arm_wunpckelub (v8qi)
v2si __builtin_arm_wunpckeluh (v4hi)
long long __builtin_arm_wunpckeluw (v2si)
v8qi __builtin_arm_wunpckihb (v8qi, v8qi)
v4hi __builtin_arm_wunpckihh (v4hi, v4hi)
v2si __builtin_arm_wunpckihw (v2si, v2si)
v8qi __builtin_arm_wunpckilb (v8qi, v8qi)
v4hi __builtin_arm_wunpckilh (v4hi, v4hi)
v2si __builtin_arm_wunpckilw (v2si, v2si)
long long __builtin_arm_wxor (long long, long long)
long long __builtin_arm_wzero ()

File: gcc.info, Node: ARM NEON Intrinsics, Next: Blackfin Built-in Functions, Prev: ARM iWMMXt Built-in Functions, Up: Target Builtins
5.50.3 ARM NEON Intrinsics
--------------------------
These built-in intrinsics for the ARM Advanced SIMD extension are
available when the '-mfpu=neon' switch is used:
5.50.3.1 Addition
.................
* uint32x2_t vadd_u32 (uint32x2_t, uint32x2_t)
_Form of expected instruction(s):_ 'vadd.i32 D0, D0, D0'
* uint16x4_t vadd_u16 (uint16x4_t, uint16x4_t)
_Form of expected instruction(s):_ 'vadd.i16 D0, D0, D0'
* uint8x8_t vadd_u8 (uint8x8_t, uint8x8_t)
_Form of expected instruction(s):_ 'vadd.i8 D0, D0, D0'
* int32x2_t vadd_s32 (int32x2_t, int32x2_t)
_Form of expected instruction(s):_ 'vadd.i32 D0, D0, D0'
* int16x4_t vadd_s16 (int16x4_t, int16x4_t)
_Form of expected instruction(s):_ 'vadd.i16 D0, D0, D0'
* int8x8_t vadd_s8 (int8x8_t, int8x8_t)
_Form of expected instruction(s):_ 'vadd.i8 D0, D0, D0'
* uint64x1_t vadd_u64 (uint64x1_t, uint64x1_t)
_Form of expected instruction(s):_ 'vadd.i64 D0, D0, D0'
* int64x1_t vadd_s64 (int64x1_t, int64x1_t)
_Form of expected instruction(s):_ 'vadd.i64 D0, D0, D0'
* float32x2_t vadd_f32 (float32x2_t, float32x2_t)
_Form of expected instruction(s):_ 'vadd.f32 D0, D0, D0'
* uint32x4_t vaddq_u32 (uint32x4_t, uint32x4_t)
_Form of expected instruction(s):_ 'vadd.i32 Q0, Q0, Q0'
* uint16x8_t vaddq_u16 (uint16x8_t, uint16x8_t)
_Form of expected instruction(s):_ 'vadd.i16 Q0, Q0, Q0'
* uint8x16_t vaddq_u8 (uint8x16_t, uint8x16_t)
_Form of expected instruction(s):_ 'vadd.i8 Q0, Q0, Q0'
* int32x4_t vaddq_s32 (int32x4_t, int32x4_t)
_Form of expected instruction(s):_ 'vadd.i32 Q0, Q0, Q0'
* int16x8_t vaddq_s16 (int16x8_t, int16x8_t)
_Form of expected instruction(s):_ 'vadd.i16 Q0, Q0, Q0'
* int8x16_t vaddq_s8 (int8x16_t, int8x16_t)
_Form of expected instruction(s):_ 'vadd.i8 Q0, Q0, Q0'
* uint64x2_t vaddq_u64 (uint64x2_t, uint64x2_t)
_Form of expected instruction(s):_ 'vadd.i64 Q0, Q0, Q0'
* int64x2_t vaddq_s64 (int64x2_t, int64x2_t)
_Form of expected instruction(s):_ 'vadd.i64 Q0, Q0, Q0'
* float32x4_t vaddq_f32 (float32x4_t, float32x4_t)
_Form of expected instruction(s):_ 'vadd.f32 Q0, Q0, Q0'
* uint64x2_t vaddl_u32 (uint32x2_t, uint32x2_t)
_Form of expected instruction(s):_ 'vaddl.u32 Q0, D0, D0'
* uint32x4_t vaddl_u16 (uint16x4_t, uint16x4_t)
_Form of expected instruction(s):_ 'vaddl.u16 Q0, D0, D0'
* uint16x8_t vaddl_u8 (uint8x8_t, uint8x8_t)
_Form of expected instruction(s):_ 'vaddl.u8 Q0, D0, D0'
* int64x2_t vaddl_s32 (int32x2_t, int32x2_t)
_Form of expected instruction(s):_ 'vaddl.s32 Q0, D0, D0'
* int32x4_t vaddl_s16 (int16x4_t, int16x4_t)
_Form of expected instruction(s):_ 'vaddl.s16 Q0, D0, D0'
* int16x8_t vaddl_s8 (int8x8_t, int8x8_t)
_Form of expected instruction(s):_ 'vaddl.s8 Q0, D0, D0'
* uint64x2_t vaddw_u32 (uint64x2_t, uint32x2_t)
_Form of expected instruction(s):_ 'vaddw.u32 Q0, Q0, D0'
* uint32x4_t vaddw_u16 (uint32x4_t, uint16x4_t)
_Form of expected instruction(s):_ 'vaddw.u16 Q0, Q0, D0'
* uint16x8_t vaddw_u8 (uint16x8_t, uint8x8_t)
_Form of expected instruction(s):_ 'vaddw.u8 Q0, Q0, D0'
* int64x2_t vaddw_s32 (int64x2_t, int32x2_t)
_Form of expected instruction(s):_ 'vaddw.s32 Q0, Q0, D0'
* int32x4_t vaddw_s16 (int32x4_t, int16x4_t)
_Form of expected instruction(s):_ 'vaddw.s16 Q0, Q0, D0'
* int16x8_t vaddw_s8 (int16x8_t, int8x8_t)
_Form of expected instruction(s):_ 'vaddw.s8 Q0, Q0, D0'
* uint32x2_t vhadd_u32 (uint32x2_t, uint32x2_t)
_Form of expected instruction(s):_ 'vhadd.u32 D0, D0, D0'
* uint16x4_t vhadd_u16 (uint16x4_t, uint16x4_t)
_Form of expected instruction(s):_ 'vhadd.u16 D0, D0, D0'
* uint8x8_t vhadd_u8 (uint8x8_t, uint8x8_t)
_Form of expected instruction(s):_ 'vhadd.u8 D0, D0, D0'
* int32x2_t vhadd_s32 (int32x2_t, int32x2_t)
_Form of expected instruction(s):_ 'vhadd.s32 D0, D0, D0'
* int16x4_t vhadd_s16 (int16x4_t, int16x4_t)
_Form of expected instruction(s):_ 'vhadd.s16 D0, D0, D0'
* int8x8_t vhadd_s8 (int8x8_t, int8x8_t)
_Form of expected instruction(s):_ 'vhadd.s8 D0, D0, D0'
* uint32x4_t vhaddq_u32 (uint32x4_t, uint32x4_t)
_Form of expected instruction(s):_ 'vhadd.u32 Q0, Q0, Q0'
* uint16x8_t vhaddq_u16 (uint16x8_t, uint16x8_t)
_Form of expected instruction(s):_ 'vhadd.u16 Q0, Q0, Q0'
* uint8x16_t vhaddq_u8 (uint8x16_t, uint8x16_t)
_Form of expected instruction(s):_ 'vhadd.u8 Q0, Q0, Q0'
* int32x4_t vhaddq_s32 (int32x4_t, int32x4_t)
_Form of expected instruction(s):_ 'vhadd.s32 Q0, Q0, Q0'
* int16x8_t vhaddq_s16 (int16x8_t, int16x8_t)
_Form of expected instruction(s):_ 'vhadd.s16 Q0, Q0, Q0'
* int8x16_t vhaddq_s8 (int8x16_t, int8x16_t)
_Form of expected instruction(s):_ 'vhadd.s8 Q0, Q0, Q0'
* uint32x2_t vrhadd_u32 (uint32x2_t, uint32x2_t)
_Form of expected instruction(s):_ 'vrhadd.u32 D0, D0, D0'
* uint16x4_t vrhadd_u16 (uint16x4_t, uint16x4_t)
_Form of expected instruction(s):_ 'vrhadd.u16 D0, D0, D0'
* uint8x8_t vrhadd_u8 (uint8x8_t, uint8x8_t)
_Form of expected instruction(s):_ 'vrhadd.u8 D0, D0, D0'
* int32x2_t vrhadd_s32 (int32x2_t, int32x2_t)
_Form of expected instruction(s):_ 'vrhadd.s32 D0, D0, D0'
* int16x4_t vrhadd_s16 (int16x4_t, int16x4_t)
_Form of expected instruction(s):_ 'vrhadd.s16 D0, D0, D0'
* int8x8_t vrhadd_s8 (int8x8_t, int8x8_t)
_Form of expected instruction(s):_ 'vrhadd.s8 D0, D0, D0'
* uint32x4_t vrhaddq_u32 (uint32x4_t, uint32x4_t)
_Form of expected instruction(s):_ 'vrhadd.u32 Q0, Q0, Q0'
* uint16x8_t vrhaddq_u16 (uint16x8_t, uint16x8_t)
_Form of expected instruction(s):_ 'vrhadd.u16 Q0, Q0, Q0'
* uint8x16_t vrhaddq_u8 (uint8x16_t, uint8x16_t)
_Form of expected instruction(s):_ 'vrhadd.u8 Q0, Q0, Q0'
* int32x4_t vrhaddq_s32 (int32x4_t, int32x4_t)
_Form of expected instruction(s):_ 'vrhadd.s32 Q0, Q0, Q0'
* int16x8_t vrhaddq_s16 (int16x8_t, int16x8_t)
_Form of expected instruction(s):_ 'vrhadd.s16 Q0, Q0, Q0'
* int8x16_t vrhaddq_s8 (int8x16_t, int8x16_t)
_Form of expected instruction(s):_ 'vrhadd.s8 Q0, Q0, Q0'
* uint32x2_t vqadd_u32 (uint32x2_t, uint32x2_t)
_Form of expected instruction(s):_ 'vqadd.u32 D0, D0, D0'
* uint16x4_t vqadd_u16 (uint16x4_t, uint16x4_t)
_Form of expected instruction(s):_ 'vqadd.u16 D0, D0, D0'
* uint8x8_t vqadd_u8 (uint8x8_t, uint8x8_t)
_Form of expected instruction(s):_ 'vqadd.u8 D0, D0, D0'
* int32x2_t vqadd_s32 (int32x2_t, int32x2_t)
_Form of expected instruction(s):_ 'vqadd.s32 D0, D0, D0'
* int16x4_t vqadd_s16 (int16x4_t, int16x4_t)
_Form of expected instruction(s):_ 'vqadd.s16 D0, D0, D0'
* int8x8_t vqadd_s8 (int8x8_t, int8x8_t)
_Form of expected instruction(s):_ 'vqadd.s8 D0, D0, D0'
* uint64x1_t vqadd_u64 (uint64x1_t, uint64x1_t)
_Form of expected instruction(s):_ 'vqadd.u64 D0, D0, D0'
* int64x1_t vqadd_s64 (int64x1_t, int64x1_t)
_Form of expected instruction(s):_ 'vqadd.s64 D0, D0, D0'
* uint32x4_t vqaddq_u32 (uint32x4_t, uint32x4_t)
_Form of expected instruction(s):_ 'vqadd.u32 Q0, Q0, Q0'
* uint16x8_t vqaddq_u16 (uint16x8_t, uint16x8_t)
_Form of expected instruction(s):_ 'vqadd.u16 Q0, Q0, Q0'
* uint8x16_t vqaddq_u8 (uint8x16_t, uint8x16_t)
_Form of expected instruction(s):_ 'vqadd.u8 Q0, Q0, Q0'
* int32x4_t vqaddq_s32 (int32x4_t, int32x4_t)
_Form of expected instruction(s):_ 'vqadd.s32 Q0, Q0, Q0'
* int16x8_t vqaddq_s16 (int16x8_t, int16x8_t)
_Form of expected instruction(s):_ 'vqadd.s16 Q0, Q0, Q0'
* int8x16_t vqaddq_s8 (int8x16_t, int8x16_t)
_Form of expected instruction(s):_ 'vqadd.s8 Q0, Q0, Q0'
* uint64x2_t vqaddq_u64 (uint64x2_t, uint64x2_t)
_Form of expected instruction(s):_ 'vqadd.u64 Q0, Q0, Q0'
* int64x2_t vqaddq_s64 (int64x2_t, int64x2_t)
_Form of expected instruction(s):_ 'vqadd.s64 Q0, Q0, Q0'
* uint32x2_t vaddhn_u64 (uint64x2_t, uint64x2_t)
_Form of expected instruction(s):_ 'vaddhn.i64 D0, Q0, Q0'
* uint16x4_t vaddhn_u32 (uint32x4_t, uint32x4_t)
_Form of expected instruction(s):_ 'vaddhn.i32 D0, Q0, Q0'
* uint8x8_t vaddhn_u16 (uint16x8_t, uint16x8_t)
_Form of expected instruction(s):_ 'vaddhn.i16 D0, Q0, Q0'
* int32x2_t vaddhn_s64 (int64x2_t, int64x2_t)
_Form of expected instruction(s):_ 'vaddhn.i64 D0, Q0, Q0'
* int16x4_t vaddhn_s32 (int32x4_t, int32x4_t)
_Form of expected instruction(s):_ 'vaddhn.i32 D0, Q0, Q0'
* int8x8_t vaddhn_s16 (int16x8_t, int16x8_t)
_Form of expected instruction(s):_ 'vaddhn.i16 D0, Q0, Q0'
* uint32x2_t vraddhn_u64 (uint64x2_t, uint64x2_t)
_Form of expected instruction(s):_ 'vraddhn.i64 D0, Q0, Q0'
* uint16x4_t vraddhn_u32 (uint32x4_t, uint32x4_t)
_Form of expected instruction(s):_ 'vraddhn.i32 D0, Q0, Q0'
* uint8x8_t vraddhn_u16 (uint16x8_t, uint16x8_t)
_Form of expected instruction(s):_ 'vraddhn.i16 D0, Q0, Q0'
* int32x2_t vraddhn_s64 (int64x2_t, int64x2_t)
_Form of expected instruction(s):_ 'vraddhn.i64 D0, Q0, Q0'
* int16x4_t vraddhn_s32 (int32x4_t, int32x4_t)
_Form of expected instruction(s):_ 'vraddhn.i32 D0, Q0, Q0'
* int8x8_t vraddhn_s16 (int16x8_t, int16x8_t)
_Form of expected instruction(s):_ 'vraddhn.i16 D0, Q0, Q0'
5.50.3.2 Multiplication
.......................
* uint32x2_t vmul_u32 (uint32x2_t, uint32x2_t)
_Form of expected instruction(s):_ 'vmul.i32 D0, D0, D0'
* uint16x4_t vmul_u16 (uint16x4_t, uint16x4_t)
_Form of expected instruction(s):_ 'vmul.i16 D0, D0, D0'
* uint8x8_t vmul_u8 (uint8x8_t, uint8x8_t)
_Form of expected instruction(s):_ 'vmul.i8 D0, D0, D0'
* int32x2_t vmul_s32 (int32x2_t, int32x2_t)
_Form of expected instruction(s):_ 'vmul.i32 D0, D0, D0'
* int16x4_t vmul_s16 (int16x4_t, int16x4_t)
_Form of expected instruction(s):_ 'vmul.i16 D0, D0, D0'
* int8x8_t vmul_s8 (int8x8_t, int8x8_t)
_Form of expected instruction(s):_ 'vmul.i8 D0, D0, D0'
* float32x2_t vmul_f32 (float32x2_t, float32x2_t)
_Form of expected instruction(s):_ 'vmul.f32 D0, D0, D0'
* poly8x8_t vmul_p8 (poly8x8_t, poly8x8_t)
_Form of expected instruction(s):_ 'vmul.p8 D0, D0, D0'
* uint32x4_t vmulq_u32 (uint32x4_t, uint32x4_t)
_Form of expected instruction(s):_ 'vmul.i32 Q0, Q0, Q0'
* uint16x8_t vmulq_u16 (uint16x8_t, uint16x8_t)
_Form of expected instruction(s):_ 'vmul.i16 Q0, Q0, Q0'
* uint8x16_t vmulq_u8 (uint8x16_t, uint8x16_t)
_Form of expected instruction(s):_ 'vmul.i8 Q0, Q0, Q0'
* int32x4_t vmulq_s32 (int32x4_t, int32x4_t)
_Form of expected instruction(s):_ 'vmul.i32 Q0, Q0, Q0'
* int16x8_t vmulq_s16 (int16x8_t, int16x8_t)
_Form of expected instruction(s):_ 'vmul.i16 Q0, Q0, Q0'
* int8x16_t vmulq_s8 (int8x16_t, int8x16_t)
_Form of expected instruction(s):_ 'vmul.i8 Q0, Q0, Q0'
* float32x4_t vmulq_f32 (float32x4_t, float32x4_t)
_Form of expected instruction(s):_ 'vmul.f32 Q0, Q0, Q0'
* poly8x16_t vmulq_p8 (poly8x16_t, poly8x16_t)
_Form of expected instruction(s):_ 'vmul.p8 Q0, Q0, Q0'
* int32x2_t vqdmulh_s32 (int32x2_t, int32x2_t)
_Form of expected instruction(s):_ 'vqdmulh.s32 D0, D0, D0'
* int16x4_t vqdmulh_s16 (int16x4_t, int16x4_t)
_Form of expected instruction(s):_ 'vqdmulh.s16 D0, D0, D0'
* int32x4_t vqdmulhq_s32 (int32x4_t, int32x4_t)
_Form of expected instruction(s):_ 'vqdmulh.s32 Q0, Q0, Q0'
* int16x8_t vqdmulhq_s16 (int16x8_t, int16x8_t)
_Form of expected instruction(s):_ 'vqdmulh.s16 Q0, Q0, Q0'
* int32x2_t vqrdmulh_s32 (int32x2_t, int32x2_t)
_Form of expected instruction(s):_ 'vqrdmulh.s32 D0, D0, D0'
* int16x4_t vqrdmulh_s16 (int16x4_t, int16x4_t)
_Form of expected instruction(s):_ 'vqrdmulh.s16 D0, D0, D0'
* int32x4_t vqrdmulhq_s32 (int32x4_t, int32x4_t)
_Form of expected instruction(s):_ 'vqrdmulh.s32 Q0, Q0, Q0'
* int16x8_t vqrdmulhq_s16 (int16x8_t, int16x8_t)
_Form of expected instruction(s):_ 'vqrdmulh.s16 Q0, Q0, Q0'
* uint64x2_t vmull_u32 (uint32x2_t, uint32x2_t)
_Form of expected instruction(s):_ 'vmull.u32 Q0, D0, D0'
* uint32x4_t vmull_u16 (uint16x4_t, uint16x4_t)
_Form of expected instruction(s):_ 'vmull.u16 Q0, D0, D0'
* uint16x8_t vmull_u8 (uint8x8_t, uint8x8_t)
_Form of expected instruction(s):_ 'vmull.u8 Q0, D0, D0'
* int64x2_t vmull_s32 (int32x2_t, int32x2_t)
_Form of expected instruction(s):_ 'vmull.s32 Q0, D0, D0'
* int32x4_t vmull_s16 (int16x4_t, int16x4_t)
_Form of expected instruction(s):_ 'vmull.s16 Q0, D0, D0'
* int16x8_t vmull_s8 (int8x8_t, int8x8_t)
_Form of expected instruction(s):_ 'vmull.s8 Q0, D0, D0'
* poly16x8_t vmull_p8 (poly8x8_t, poly8x8_t)
_Form of expected instruction(s):_ 'vmull.p8 Q0, D0, D0'
* int64x2_t vqdmull_s32 (int32x2_t, int32x2_t)
_Form of expected instruction(s):_ 'vqdmull.s32 Q0, D0, D0'
* int32x4_t vqdmull_s16 (int16x4_t, int16x4_t)
_Form of expected instruction(s):_ 'vqdmull.s16 Q0, D0, D0'
5.50.3.3 Multiply-accumulate
............................
* uint32x2_t vmla_u32 (uint32x2_t, uint32x2_t, uint32x2_t)
_Form of expected instruction(s):_ 'vmla.i32 D0, D0, D0'
* uint16x4_t vmla_u16 (uint16x4_t, uint16x4_t, uint16x4_t)
_Form of expected instruction(s):_ 'vmla.i16 D0, D0, D0'
* uint8x8_t vmla_u8 (uint8x8_t, uint8x8_t, uint8x8_t)
_Form of expected instruction(s):_ 'vmla.i8 D0, D0, D0'
* int32x2_t vmla_s32 (int32x2_t, int32x2_t, int32x2_t)
_Form of expected instruction(s):_ 'vmla.i32 D0, D0, D0'
* int16x4_t vmla_s16 (int16x4_t, int16x4_t, int16x4_t)
_Form of expected instruction(s):_ 'vmla.i16 D0, D0, D0'
* int8x8_t vmla_s8 (int8x8_t, int8x8_t, int8x8_t)
_Form of expected instruction(s):_ 'vmla.i8 D0, D0, D0'
* float32x2_t vmla_f32 (float32x2_t, float32x2_t, float32x2_t)
_Form of expected instruction(s):_ 'vmla.f32 D0, D0, D0'
* uint32x4_t vmlaq_u32 (uint32x4_t, uint32x4_t, uint32x4_t)
_Form of expected instruction(s):_ 'vmla.i32 Q0, Q0, Q0'
* uint16x8_t vmlaq_u16 (uint16x8_t, uint16x8_t, uint16x8_t)
_Form of expected instruction(s):_ 'vmla.i16 Q0, Q0, Q0'
* uint8x16_t vmlaq_u8 (uint8x16_t, uint8x16_t, uint8x16_t)
_Form of expected instruction(s):_ 'vmla.i8 Q0, Q0, Q0'
* int32x4_t vmlaq_s32 (int32x4_t, int32x4_t, int32x4_t)
_Form of expected instruction(s):_ 'vmla.i32 Q0, Q0, Q0'
* int16x8_t vmlaq_s16 (int16x8_t, int16x8_t, int16x8_t)
_Form of expected instruction(s):_ 'vmla.i16 Q0, Q0, Q0'
* int8x16_t vmlaq_s8 (int8x16_t, int8x16_t, int8x16_t)
_Form of expected instruction(s):_ 'vmla.i8 Q0, Q0, Q0'
* float32x4_t vmlaq_f32 (float32x4_t, float32x4_t, float32x4_t)
_Form of expected instruction(s):_ 'vmla.f32 Q0, Q0, Q0'
* uint64x2_t vmlal_u32 (uint64x2_t, uint32x2_t, uint32x2_t)
_Form of expected instruction(s):_ 'vmlal.u32 Q0, D0, D0'
* uint32x4_t vmlal_u16 (uint32x4_t, uint16x4_t, uint16x4_t)
_Form of expected instruction(s):_ 'vmlal.u16 Q0, D0, D0'
* uint16x8_t vmlal_u8 (uint16x8_t, uint8x8_t, uint8x8_t)
_Form of expected instruction(s):_ 'vmlal.u8 Q0, D0, D0'
* int64x2_t vmlal_s32 (int64x2_t, int32x2_t, int32x2_t)
_Form of expected instruction(s):_ 'vmlal.s32 Q0, D0, D0'
* int32x4_t vmlal_s16 (int32x4_t, int16x4_t, int16x4_t)
_Form of expected instruction(s):_ 'vmlal.s16 Q0, D0, D0'
* int16x8_t vmlal_s8 (int16x8_t, int8x8_t, int8x8_t)
_Form of expected instruction(s):_ 'vmlal.s8 Q0, D0, D0'
* int64x2_t vqdmlal_s32 (int64x2_t, int32x2_t, int32x2_t)
_Form of expected instruction(s):_ 'vqdmlal.s32 Q0, D0, D0'
* int32x4_t vqdmlal_s16 (int32x4_t, int16x4_t, int16x4_t)
_Form of expected instruction(s):_ 'vqdmlal.s16 Q0, D0, D0'
5.50.3.4 Multiply-subtract
..........................
* uint32x2_t vmls_u32 (uint32x2_t, uint32x2_t, uint32x2_t)
_Form of expected instruction(s):_ 'vmls.i32 D0, D0, D0'
* uint16x4_t vmls_u16 (uint16x4_t, uint16x4_t, uint16x4_t)
_Form of expected instruction(s):_ 'vmls.i16 D0, D0, D0'
* uint8x8_t vmls_u8 (uint8x8_t, uint8x8_t, uint8x8_t)
_Form of expected instruction(s):_ 'vmls.i8 D0, D0, D0'
* int32x2_t vmls_s32 (int32x2_t, int32x2_t, int32x2_t)
_Form of expected instruction(s):_ 'vmls.i32 D0, D0, D0'
* int16x4_t vmls_s16 (int16x4_t, int16x4_t, int16x4_t)
_Form of expected instruction(s):_ 'vmls.i16 D0, D0, D0'
* int8x8_t vmls_s8 (int8x8_t, int8x8_t, int8x8_t)
_Form of expected instruction(s):_ 'vmls.i8 D0, D0, D0'
* float32x2_t vmls_f32 (float32x2_t, float32x2_t, float32x2_t)
_Form of expected instruction(s):_ 'vmls.f32 D0, D0, D0'
* uint32x4_t vmlsq_u32 (uint32x4_t, uint32x4_t, uint32x4_t)
_Form of expected instruction(s):_ 'vmls.i32 Q0, Q0, Q0'
* uint16x8_t vmlsq_u16 (uint16x8_t, uint16x8_t, uint16x8_t)
_Form of expected instruction(s):_ 'vmls.i16 Q0, Q0, Q0'
* uint8x16_t vmlsq_u8 (uint8x16_t, uint8x16_t, uint8x16_t)
_Form of expected instruction(s):_ 'vmls.i8 Q0, Q0, Q0'
* int32x4_t vmlsq_s32 (int32x4_t, int32x4_t, int32x4_t)
_Form of expected instruction(s):_ 'vmls.i32 Q0, Q0, Q0'
* int16x8_t vmlsq_s16 (int16x8_t, int16x8_t, int16x8_t)
_Form of expected instruction(s):_ 'vmls.i16 Q0, Q0, Q0'
* int8x16_t vmlsq_s8 (int8x16_t, int8x16_t, int8x16_t)
_Form of expected instruction(s):_ 'vmls.i8 Q0, Q0, Q0'
* float32x4_t vmlsq_f32 (float32x4_t, float32x4_t, float32x4_t)
_Form of expected instruction(s):_ 'vmls.f32 Q0, Q0, Q0'
* uint64x2_t vmlsl_u32 (uint64x2_t, uint32x2_t, uint32x2_t)
_Form of expected instruction(s):_ 'vmlsl.u32 Q0, D0, D0'
* uint32x4_t vmlsl_u16 (uint32x4_t, uint16x4_t, uint16x4_t)
_Form of expected instruction(s):_ 'vmlsl.u16 Q0, D0, D0'
* uint16x8_t vmlsl_u8 (uint16x8_t, uint8x8_t, uint8x8_t)
_Form of expected instruction(s):_ 'vmlsl.u8 Q0, D0, D0'
* int64x2_t vmlsl_s32 (int64x2_t, int32x2_t, int32x2_t)
_Form of expected instruction(s):_ 'vmlsl.s32 Q0, D0, D0'
* int32x4_t vmlsl_s16 (int32x4_t, int16x4_t, int16x4_t)
_Form of expected instruction(s):_ 'vmlsl.s16 Q0, D0, D0'
* int16x8_t vmlsl_s8 (int16x8_t, int8x8_t, int8x8_t)
_Form of expected instruction(s):_ 'vmlsl.s8 Q0, D0, D0'
* int64x2_t vqdmlsl_s32 (int64x2_t, int32x2_t, int32x2_t)
_Form of expected instruction(s):_ 'vqdmlsl.s32 Q0, D0, D0'
* int32x4_t vqdmlsl_s16 (int32x4_t, int16x4_t, int16x4_t)
_Form of expected instruction(s):_ 'vqdmlsl.s16 Q0, D0, D0'
5.50.3.5 Subtraction
....................
* uint32x2_t vsub_u32 (uint32x2_t, uint32x2_t)
_Form of expected instruction(s):_ 'vsub.i32 D0, D0, D0'
* uint16x4_t vsub_u16 (uint16x4_t, uint16x4_t)
_Form of expected instruction(s):_ 'vsub.i16 D0, D0, D0'
* uint8x8_t vsub_u8 (uint8x8_t, uint8x8_t)
_Form of expected instruction(s):_ 'vsub.i8 D0, D0, D0'
* int32x2_t vsub_s32 (int32x2_t, int32x2_t)
_Form of expected instruction(s):_ 'vsub.i32 D0, D0, D0'
* int16x4_t vsub_s16 (int16x4_t, int16x4_t)
_Form of expected instruction(s):_ 'vsub.i16 D0, D0, D0'
* int8x8_t vsub_s8 (int8x8_t, int8x8_t)
_Form of expected instruction(s):_ 'vsub.i8 D0, D0, D0'
* uint64x1_t vsub_u64 (uint64x1_t, uint64x1_t)
_Form of expected instruction(s):_ 'vsub.i64 D0, D0, D0'
* int64x1_t vsub_s64 (int64x1_t, int64x1_t)
_Form of expected instruction(s):_ 'vsub.i64 D0, D0, D0'
* float32x2_t vsub_f32 (float32x2_t, float32x2_t)
_Form of expected instruction(s):_ 'vsub.f32 D0, D0, D0'
* uint32x4_t vsubq_u32 (uint32x4_t, uint32x4_t)
_Form of expected instruction(s):_ 'vsub.i32 Q0, Q0, Q0'
* uint16x8_t vsubq_u16 (uint16x8_t, uint16x8_t)
_Form of expected instruction(s):_ 'vsub.i16 Q0, Q0, Q0'
* uint8x16_t vsubq_u8 (uint8x16_t, uint8x16_t)
_Form of expected instruction(s):_ 'vsub.i8 Q0, Q0, Q0'
* int32x4_t vsubq_s32 (int32x4_t, int32x4_t)
_Form of expected instruction(s):_ 'vsub.i32 Q0, Q0, Q0'
* int16x8_t vsubq_s16 (int16x8_t, int16x8_t)
_Form of expected instruction(s):_ 'vsub.i16 Q0, Q0, Q0'
* int8x16_t vsubq_s8 (int8x16_t, int8x16_t)
_Form of expected instruction(s):_ 'vsub.i8 Q0, Q0, Q0'
* uint64x2_t vsubq_u64 (uint64x2_t, uint64x2_t)
_Form of expected instruction(s):_ 'vsub.i64 Q0, Q0, Q0'
* int64x2_t vsubq_s64 (int64x2_t, int64x2_t)
_Form of expected instruction(s):_ 'vsub.i64 Q0, Q0, Q0'
* float32x4_t vsubq_f32 (float32x4_t, float32x4_t)
_Form of expected instruction(s):_ 'vsub.f32 Q0, Q0, Q0'
* uint64x2_t vsubl_u32 (uint32x2_t, uint32x2_t)
_Form of expected instruction(s):_ 'vsubl.u32 Q0, D0, D0'
* uint32x4_t vsubl_u16 (uint16x4_t, uint16x4_t)
_Form of expected instruction(s):_ 'vsubl.u16 Q0, D0, D0'
* uint16x8_t vsubl_u8 (uint8x8_t, uint8x8_t)
_Form of expected instruction(s):_ 'vsubl.u8 Q0, D0, D0'
* int64x2_t vsubl_s32 (int32x2_t, int32x2_t)
_Form of expected instruction(s):_ 'vsubl.s32 Q0, D0, D0'
* int32x4_t vsubl_s16 (int16x4_t, int16x4_t)
_Form of expected instruction(s):_ 'vsubl.s16 Q0, D0, D0'
* int16x8_t vsubl_s8 (int8x8_t, int8x8_t)
_Form of expected instruction(s):_ 'vsubl.s8 Q0, D0, D0'
* uint64x2_t vsubw_u32 (uint64x2_t, uint32x2_t)
_Form of expected instruction(s):_ 'vsubw.u32 Q0, Q0, D0'
* uint32x4_t vsubw_u16 (uint32x4_t, uint16x4_t)
_Form of expected instruction(s):_ 'vsubw.u16 Q0, Q0, D0'
* uint16x8_t vsubw_u8 (uint16x8_t, uint8x8_t)
_Form of expected instruction(s):_ 'vsubw.u8 Q0, Q0, D0'
* int64x2_t vsubw_s32 (int64x2_t, int32x2_t)
_Form of expected instruction(s):_ 'vsubw.s32 Q0, Q0, D0'
* int32x4_t vsubw_s16 (int32x4_t, int16x4_t)
_Form of expected instruction(s):_ 'vsubw.s16 Q0, Q0, D0'
* int16x8_t vsubw_s8 (int16x8_t, int8x8_t)
_Form of expected instruction(s):_ 'vsubw.s8 Q0, Q0, D0'
* uint32x2_t vhsub_u32 (uint32x2_t, uint32x2_t)
_Form of expected instruction(s):_ 'vhsub.u32 D0, D0, D0'
* uint16x4_t vhsub_u16 (uint16x4_t, uint16x4_t)
_Form of expected instruction(s):_ 'vhsub.u16 D0, D0, D0'
* uint8x8_t vhsub_u8 (uint8x8_t, uint8x8_t)
_Form of expected instruction(s):_ 'vhsub.u8 D0, D0, D0'
* int32x2_t vhsub_s32 (int32x2_t, int32x2_t)
_Form of expected instruction(s):_ 'vhsub.s32 D0, D0, D0'
* int16x4_t vhsub_s16 (int16x4_t, int16x4_t)
_Form of expected instruction(s):_ 'vhsub.s16 D0, D0, D0'
* int8x8_t vhsub_s8 (int8x8_t, int8x8_t)
_Form of expected instruction(s):_ 'vhsub.s8 D0, D0, D0'
* uint32x4_t vhsubq_u32 (uint32x4_t, uint32x4_t)
_Form of expected instruction(s):_ 'vhsub.u32 Q0, Q0, Q0'
* uint16x8_t vhsubq_u16 (uint16x8_t, uint16x8_t)
_Form of expected instruction(s):_ 'vhsub.u16 Q0, Q0, Q0'
* uint8x16_t vhsubq_u8 (uint8x16_t, uint8x16_t)
_Form of expected instruction(s):_ 'vhsub.u8 Q0, Q0, Q0'
* int32x4_t vhsubq_s32 (int32x4_t, int32x4_t)
_Form of expected instruction(s):_ 'vhsub.s32 Q0, Q0, Q0'
* int16x8_t vhsubq_s16 (int16x8_t, int16x8_t)
_Form of expected instruction(s):_ 'vhsub.s16 Q0, Q0, Q0'
* int8x16_t vhsubq_s8 (int8x16_t, int8x16_t)
_Form of expected instruction(s):_ 'vhsub.s8 Q0, Q0, Q0'
* uint32x2_t vqsub_u32 (uint32x2_t, uint32x2_t)
_Form of expected instruction(s):_ 'vqsub.u32 D0, D0, D0'
* uint16x4_t vqsub_u16 (uint16x4_t, uint16x4_t)
_Form of expected instruction(s):_ 'vqsub.u16 D0, D0, D0'
* uint8x8_t vqsub_u8 (uint8x8_t, uint8x8_t)
_Form of expected instruction(s):_ 'vqsub.u8 D0, D0, D0'
* int32x2_t vqsub_s32 (int32x2_t, int32x2_t)
_Form of expected instruction(s):_ 'vqsub.s32 D0, D0, D0'
* int16x4_t vqsub_s16 (int16x4_t, int16x4_t)
_Form of expected instruction(s):_ 'vqsub.s16 D0, D0, D0'
* int8x8_t vqsub_s8 (int8x8_t, int8x8_t)
_Form of expected instruction(s):_ 'vqsub.s8 D0, D0, D0'
* uint64x1_t vqsub_u64 (uint64x1_t, uint64x1_t)
_Form of expected instruction(s):_ 'vqsub.u64 D0, D0, D0'
* int64x1_t vqsub_s64 (int64x1_t, int64x1_t)
_Form of expected instruction(s):_ 'vqsub.s64 D0, D0, D0'
* uint32x4_t vqsubq_u32 (uint32x4_t, uint32x4_t)
_Form of expected instruction(s):_ 'vqsub.u32 Q0, Q0, Q0'
* uint16x8_t vqsubq_u16 (uint16x8_t, uint16x8_t)
_Form of expected instruction(s):_ 'vqsub.u16 Q0, Q0, Q0'
* uint8x16_t vqsubq_u8 (uint8x16_t, uint8x16_t)
_Form of expected instruction(s):_ 'vqsub.u8 Q0, Q0, Q0'
* int32x4_t vqsubq_s32 (int32x4_t, int32x4_t)
_Form of expected instruction(s):_ 'vqsub.s32 Q0, Q0, Q0'
* int16x8_t vqsubq_s16 (int16x8_t, int16x8_t)
_Form of expected instruction(s):_ 'vqsub.s16 Q0, Q0, Q0'
* int8x16_t vqsubq_s8 (int8x16_t, int8x16_t)
_Form of expected instruction(s):_ 'vqsub.s8 Q0, Q0, Q0'
* uint64x2_t vqsubq_u64 (uint64x2_t, uint64x2_t)
_Form of expected instruction(s):_ 'vqsub.u64 Q0, Q0, Q0'
* int64x2_t vqsubq_s64 (int64x2_t, int64x2_t)
_Form of expected instruction(s):_ 'vqsub.s64 Q0, Q0, Q0'
* uint32x2_t vsubhn_u64 (uint64x2_t, uint64x2_t)
_Form of expected instruction(s):_ 'vsubhn.i64 D0, Q0, Q0'
* uint16x4_t vsubhn_u32 (uint32x4_t, uint32x4_t)
_Form of expected instruction(s):_ 'vsubhn.i32 D0, Q0, Q0'
* uint8x8_t vsubhn_u16 (uint16x8_t, uint16x8_t)
_Form of expected instruction(s):_ 'vsubhn.i16 D0, Q0, Q0'
* int32x2_t vsubhn_s64 (int64x2_t, int64x2_t)
_Form of expected instruction(s):_ 'vsubhn.i64 D0, Q0, Q0'
* int16x4_t vsubhn_s32 (int32x4_t, int32x4_t)
_Form of expected instruction(s):_ 'vsubhn.i32 D0, Q0, Q0'
* int8x8_t vsubhn_s16 (int16x8_t, int16x8_t)
_Form of expected instruction(s):_ 'vsubhn.i16 D0, Q0, Q0'
* uint32x2_t vrsubhn_u64 (uint64x2_t, uint64x2_t)
_Form of expected instruction(s):_ 'vrsubhn.i64 D0, Q0, Q0'
* uint16x4_t vrsubhn_u32 (uint32x4_t, uint32x4_t)
_Form of expected instruction(s):_ 'vrsubhn.i32 D0, Q0, Q0'
* uint8x8_t vrsubhn_u16 (uint16x8_t, uint16x8_t)
_Form of expected instruction(s):_ 'vrsubhn.i16 D0, Q0, Q0'
* int32x2_t vrsubhn_s64 (int64x2_t, int64x2_t)
_Form of expected instruction(s):_ 'vrsubhn.i64 D0, Q0, Q0'
* int16x4_t vrsubhn_s32 (int32x4_t, int32x4_t)
_Form of expected instruction(s):_ 'vrsubhn.i32 D0, Q0, Q0'
* int8x8_t vrsubhn_s16 (int16x8_t, int16x8_t)
_Form of expected instruction(s):_ 'vrsubhn.i16 D0, Q0, Q0'
5.50.3.6 Comparison (equal-to)
..............................
* uint32x2_t vceq_u32 (uint32x2_t, uint32x2_t)
_Form of expected instruction(s):_ 'vceq.i32 D0, D0, D0'
* uint16x4_t vceq_u16 (uint16x4_t, uint16x4_t)
_Form of expected instruction(s):_ 'vceq.i16 D0, D0, D0'
* uint8x8_t vceq_u8 (uint8x8_t, uint8x8_t)
_Form of expected instruction(s):_ 'vceq.i8 D0, D0, D0'
* uint32x2_t vceq_s32 (int32x2_t, int32x2_t)
_Form of expected instruction(s):_ 'vceq.i32 D0, D0, D0'
* uint16x4_t vceq_s16 (int16x4_t, int16x4_t)
_Form of expected instruction(s):_ 'vceq.i16 D0, D0, D0'
* uint8x8_t vceq_s8 (int8x8_t, int8x8_t)
_Form of expected instruction(s):_ 'vceq.i8 D0, D0, D0'
* uint32x2_t vceq_f32 (float32x2_t, float32x2_t)
_Form of expected instruction(s):_ 'vceq.f32 D0, D0, D0'
* uint8x8_t vceq_p8 (poly8x8_t, poly8x8_t)
_Form of expected instruction(s):_ 'vceq.i8 D0, D0, D0'
* uint32x4_t vceqq_u32 (uint32x4_t, uint32x4_t)
_Form of expected instruction(s):_ 'vceq.i32 Q0, Q0, Q0'
* uint16x8_t vceqq_u16 (uint16x8_t, uint16x8_t)
_Form of expected instruction(s):_ 'vceq.i16 Q0, Q0, Q0'
* uint8x16_t vceqq_u8 (uint8x16_t, uint8x16_t)
_Form of expected instruction(s):_ 'vceq.i8 Q0, Q0, Q0'
* uint32x4_t vceqq_s32 (int32x4_t, int32x4_t)
_Form of expected instruction(s):_ 'vceq.i32 Q0, Q0, Q0'
* uint16x8_t vceqq_s16 (int16x8_t, int16x8_t)
_Form of expected instruction(s):_ 'vceq.i16 Q0, Q0, Q0'
* uint8x16_t vceqq_s8 (int8x16_t, int8x16_t)
_Form of expected instruction(s):_ 'vceq.i8 Q0, Q0, Q0'
* uint32x4_t vceqq_f32 (float32x4_t, float32x4_t)
_Form of expected instruction(s):_ 'vceq.f32 Q0, Q0, Q0'
* uint8x16_t vceqq_p8 (poly8x16_t, poly8x16_t)
_Form of expected instruction(s):_ 'vceq.i8 Q0, Q0, Q0'
5.50.3.7 Comparison (greater-than-or-equal-to)
..............................................
* uint32x2_t vcge_u32 (uint32x2_t, uint32x2_t)
_Form of expected instruction(s):_ 'vcge.u32 D0, D0, D0'
* uint16x4_t vcge_u16 (uint16x4_t, uint16x4_t)
_Form of expected instruction(s):_ 'vcge.u16 D0, D0, D0'
* uint8x8_t vcge_u8 (uint8x8_t, uint8x8_t)
_Form of expected instruction(s):_ 'vcge.u8 D0, D0, D0'
* uint32x2_t vcge_s32 (int32x2_t, int32x2_t)
_Form of expected instruction(s):_ 'vcge.s32 D0, D0, D0'
* uint16x4_t vcge_s16 (int16x4_t, int16x4_t)
_Form of expected instruction(s):_ 'vcge.s16 D0, D0, D0'
* uint8x8_t vcge_s8 (int8x8_t, int8x8_t)
_Form of expected instruction(s):_ 'vcge.s8 D0, D0, D0'
* uint32x2_t vcge_f32 (float32x2_t, float32x2_t)
_Form of expected instruction(s):_ 'vcge.f32 D0, D0, D0'
* uint32x4_t vcgeq_u32 (uint32x4_t, uint32x4_t)
_Form of expected instruction(s):_ 'vcge.u32 Q0, Q0, Q0'
* uint16x8_t vcgeq_u16 (uint16x8_t, uint16x8_t)
_Form of expected instruction(s):_ 'vcge.u16 Q0, Q0, Q0'
* uint8x16_t vcgeq_u8 (uint8x16_t, uint8x16_t)
_Form of expected instruction(s):_ 'vcge.u8 Q0, Q0, Q0'
* uint32x4_t vcgeq_s32 (int32x4_t, int32x4_t)
_Form of expected instruction(s):_ 'vcge.s32 Q0, Q0, Q0'
* uint16x8_t vcgeq_s16 (int16x8_t, int16x8_t)
_Form of expected instruction(s):_ 'vcge.s16 Q0, Q0, Q0'
* uint8x16_t vcgeq_s8 (int8x16_t, int8x16_t)
_Form of expected instruction(s):_ 'vcge.s8 Q0, Q0, Q0'
* uint32x4_t vcgeq_f32 (float32x4_t, float32x4_t)
_Form of expected instruction(s):_ 'vcge.f32 Q0, Q0, Q0'
5.50.3.8 Comparison (less-than-or-equal-to)
...........................................
* uint32x2_t vcle_u32 (uint32x2_t, uint32x2_t)
_Form of expected instruction(s):_ 'vcge.u32 D0, D0, D0'
* uint16x4_t vcle_u16 (uint16x4_t, uint16x4_t)
_Form of expected instruction(s):_ 'vcge.u16 D0, D0, D0'
* uint8x8_t vcle_u8 (uint8x8_t, uint8x8_t)
_Form of expected instruction(s):_ 'vcge.u8 D0, D0, D0'
* uint32x2_t vcle_s32 (int32x2_t, int32x2_t)
_Form of expected instruction(s):_ 'vcge.s32 D0, D0, D0'
* uint16x4_t vcle_s16 (int16x4_t, int16x4_t)
_Form of expected instruction(s):_ 'vcge.s16 D0, D0, D0'
* uint8x8_t vcle_s8 (int8x8_t, int8x8_t)
_Form of expected instruction(s):_ 'vcge.s8 D0, D0, D0'
* uint32x2_t vcle_f32 (float32x2_t, float32x2_t)
_Form of expected instruction(s):_ 'vcge.f32 D0, D0, D0'
* uint32x4_t vcleq_u32 (uint32x4_t, uint32x4_t)
_Form of expected instruction(s):_ 'vcge.u32 Q0, Q0, Q0'
* uint16x8_t vcleq_u16 (uint16x8_t, uint16x8_t)
_Form of expected instruction(s):_ 'vcge.u16 Q0, Q0, Q0'
* uint8x16_t vcleq_u8 (uint8x16_t, uint8x16_t)
_Form of expected instruction(s):_ 'vcge.u8 Q0, Q0, Q0'
* uint32x4_t vcleq_s32 (int32x4_t, int32x4_t)
_Form of expected instruction(s):_ 'vcge.s32 Q0, Q0, Q0'
* uint16x8_t vcleq_s16 (int16x8_t, int16x8_t)
_Form of expected instruction(s):_ 'vcge.s16 Q0, Q0, Q0'
* uint8x16_t vcleq_s8 (int8x16_t, int8x16_t)
_Form of expected instruction(s):_ 'vcge.s8 Q0, Q0, Q0'
* uint32x4_t vcleq_f32 (float32x4_t, float32x4_t)
_Form of expected instruction(s):_ 'vcge.f32 Q0, Q0, Q0'
5.50.3.9 Comparison (greater-than)
..................................
* uint32x2_t vcgt_u32 (uint32x2_t, uint32x2_t)
_Form of expected instruction(s):_ 'vcgt.u32 D0, D0, D0'
* uint16x4_t vcgt_u16 (uint16x4_t, uint16x4_t)
_Form of expected instruction(s):_ 'vcgt.u16 D0, D0, D0'
* uint8x8_t vcgt_u8 (uint8x8_t, uint8x8_t)
_Form of expected instruction(s):_ 'vcgt.u8 D0, D0, D0'
* uint32x2_t vcgt_s32 (int32x2_t, int32x2_t)
_Form of expected instruction(s):_ 'vcgt.s32 D0, D0, D0'
* uint16x4_t vcgt_s16 (int16x4_t, int16x4_t)
_Form of expected instruction(s):_ 'vcgt.s16 D0, D0, D0'
* uint8x8_t vcgt_s8 (int8x8_t, int8x8_t)
_Form of expected instruction(s):_ 'vcgt.s8 D0, D0, D0'
* uint32x2_t vcgt_f32 (float32x2_t, float32x2_t)
_Form of expected instruction(s):_ 'vcgt.f32 D0, D0, D0'
* uint32x4_t vcgtq_u32 (uint32x4_t, uint32x4_t)
_Form of expected instruction(s):_ 'vcgt.u32 Q0, Q0, Q0'
* uint16x8_t vcgtq_u16 (uint16x8_t, uint16x8_t)
_Form of expected instruction(s):_ 'vcgt.u16 Q0, Q0, Q0'
* uint8x16_t vcgtq_u8 (uint8x16_t, uint8x16_t)
_Form of expected instruction(s):_ 'vcgt.u8 Q0, Q0, Q0'
* uint32x4_t vcgtq_s32 (int32x4_t, int32x4_t)
_Form of expected instruction(s):_ 'vcgt.s32 Q0, Q0, Q0'
* uint16x8_t vcgtq_s16 (int16x8_t, int16x8_t)
_Form of expected instruction(s):_ 'vcgt.s16 Q0, Q0, Q0'
* uint8x16_t vcgtq_s8 (int8x16_t, int8x16_t)
_Form of expected instruction(s):_ 'vcgt.s8 Q0, Q0, Q0'
* uint32x4_t vcgtq_f32 (float32x4_t, float32x4_t)
_Form of expected instruction(s):_ 'vcgt.f32 Q0, Q0, Q0'
5.50.3.10 Comparison (less-than)
................................
* uint32x2_t vclt_u32 (uint32x2_t, uint32x2_t)
_Form of expected instruction(s):_ 'vcgt.u32 D0, D0, D0'
* uint16x4_t vclt_u16 (uint16x4_t, uint16x4_t)
_Form of expected instruction(s):_ 'vcgt.u16 D0, D0, D0'
* uint8x8_t vclt_u8 (uint8x8_t, uint8x8_t)
_Form of expected instruction(s):_ 'vcgt.u8 D0, D0, D0'
* uint32x2_t vclt_s32 (int32x2_t, int32x2_t)
_Form of expected instruction(s):_ 'vcgt.s32 D0, D0, D0'
* uint16x4_t vclt_s16 (int16x4_t, int16x4_t)
_Form of expected instruction(s):_ 'vcgt.s16 D0, D0, D0'
* uint8x8_t vclt_s8 (int8x8_t, int8x8_t)
_Form of expected instruction(s):_ 'vcgt.s8 D0, D0, D0'
* uint32x2_t vclt_f32 (float32x2_t, float32x2_t)
_Form of expected instruction(s):_ 'vcgt.f32 D0, D0, D0'
* uint32x4_t vcltq_u32 (uint32x4_t, uint32x4_t)
_Form of expected instruction(s):_ 'vcgt.u32 Q0, Q0, Q0'
* uint16x8_t vcltq_u16 (uint16x8_t, uint16x8_t)
_Form of expected instruction(s):_ 'vcgt.u16 Q0, Q0, Q0'
* uint8x16_t vcltq_u8 (uint8x16_t, uint8x16_t)
_Form of expected instruction(s):_ 'vcgt.u8 Q0, Q0, Q0'
* uint32x4_t vcltq_s32 (int32x4_t, int32x4_t)
_Form of expected instruction(s):_ 'vcgt.s32 Q0, Q0, Q0'
* uint16x8_t vcltq_s16 (int16x8_t, int16x8_t)
_Form of expected instruction(s):_ 'vcgt.s16 Q0, Q0, Q0'
* uint8x16_t vcltq_s8 (int8x16_t, int8x16_t)
_Form of expected instruction(s):_ 'vcgt.s8 Q0, Q0, Q0'
* uint32x4_t vcltq_f32 (float32x4_t, float32x4_t)
_Form of expected instruction(s):_ 'vcgt.f32 Q0, Q0, Q0'
5.50.3.11 Comparison (absolute greater-than-or-equal-to)
........................................................
* uint32x2_t vcage_f32 (float32x2_t, float32x2_t)
_Form of expected instruction(s):_ 'vacge.f32 D0, D0, D0'
* uint32x4_t vcageq_f32 (float32x4_t, float32x4_t)
_Form of expected instruction(s):_ 'vacge.f32 Q0, Q0, Q0'
5.50.3.12 Comparison (absolute less-than-or-equal-to)
.....................................................
* uint32x2_t vcale_f32 (float32x2_t, float32x2_t)
_Form of expected instruction(s):_ 'vacge.f32 D0, D0, D0'
* uint32x4_t vcaleq_f32 (float32x4_t, float32x4_t)
_Form of expected instruction(s):_ 'vacge.f32 Q0, Q0, Q0'
5.50.3.13 Comparison (absolute greater-than)
............................................
* uint32x2_t vcagt_f32 (float32x2_t, float32x2_t)
_Form of expected instruction(s):_ 'vacgt.f32 D0, D0, D0'
* uint32x4_t vcagtq_f32 (float32x4_t, float32x4_t)
_Form of expected instruction(s):_ 'vacgt.f32 Q0, Q0, Q0'
5.50.3.14 Comparison (absolute less-than)
.........................................
* uint32x2_t vcalt_f32 (float32x2_t, float32x2_t)
_Form of expected instruction(s):_ 'vacgt.f32 D0, D0, D0'
* uint32x4_t vcaltq_f32 (float32x4_t, float32x4_t)
_Form of expected instruction(s):_ 'vacgt.f32 Q0, Q0, Q0'
5.50.3.15 Test bits
...................
* uint32x2_t vtst_u32 (uint32x2_t, uint32x2_t)
_Form of expected instruction(s):_ 'vtst.32 D0, D0, D0'
* uint16x4_t vtst_u16 (uint16x4_t, uint16x4_t)
_Form of expected instruction(s):_ 'vtst.16 D0, D0, D0'
* uint8x8_t vtst_u8 (uint8x8_t, uint8x8_t)
_Form of expected instruction(s):_ 'vtst.8 D0, D0, D0'
* uint32x2_t vtst_s32 (int32x2_t, int32x2_t)
_Form of expected instruction(s):_ 'vtst.32 D0, D0, D0'
* uint16x4_t vtst_s16 (int16x4_t, int16x4_t)
_Form of expected instruction(s):_ 'vtst.16 D0, D0, D0'
* uint8x8_t vtst_s8 (int8x8_t, int8x8_t)
_Form of expected instruction(s):_ 'vtst.8 D0, D0, D0'
* uint8x8_t vtst_p8 (poly8x8_t, poly8x8_t)
_Form of expected instruction(s):_ 'vtst.8 D0, D0, D0'
* uint32x4_t vtstq_u32 (uint32x4_t, uint32x4_t)
_Form of expected instruction(s):_ 'vtst.32 Q0, Q0, Q0'
* uint16x8_t vtstq_u16 (uint16x8_t, uint16x8_t)
_Form of expected instruction(s):_ 'vtst.16 Q0, Q0, Q0'
* uint8x16_t vtstq_u8 (uint8x16_t, uint8x16_t)
_Form of expected instruction(s):_ 'vtst.8 Q0, Q0, Q0'
* uint32x4_t vtstq_s32 (int32x4_t, int32x4_t)
_Form of expected instruction(s):_ 'vtst.32 Q0, Q0, Q0'
* uint16x8_t vtstq_s16 (int16x8_t, int16x8_t)
_Form of expected instruction(s):_ 'vtst.16 Q0, Q0, Q0'
* uint8x16_t vtstq_s8 (int8x16_t, int8x16_t)
_Form of expected instruction(s):_ 'vtst.8 Q0, Q0, Q0'
* uint8x16_t vtstq_p8 (poly8x16_t, poly8x16_t)
_Form of expected instruction(s):_ 'vtst.8 Q0, Q0, Q0'
5.50.3.16 Absolute difference
.............................
* uint32x2_t vabd_u32 (uint32x2_t, uint32x2_t)
_Form of expected instruction(s):_ 'vabd.u32 D0, D0, D0'
* uint16x4_t vabd_u16 (uint16x4_t, uint16x4_t)
_Form of expected instruction(s):_ 'vabd.u16 D0, D0, D0'
* uint8x8_t vabd_u8 (uint8x8_t, uint8x8_t)
_Form of expected instruction(s):_ 'vabd.u8 D0, D0, D0'
* int32x2_t vabd_s32 (int32x2_t, int32x2_t)
_Form of expected instruction(s):_ 'vabd.s32 D0, D0, D0'
* int16x4_t vabd_s16 (int16x4_t, int16x4_t)
_Form of expected instruction(s):_ 'vabd.s16 D0, D0, D0'
* int8x8_t vabd_s8 (int8x8_t, int8x8_t)
_Form of expected instruction(s):_ 'vabd.s8 D0, D0, D0'
* float32x2_t vabd_f32 (float32x2_t, float32x2_t)
_Form of expected instruction(s):_ 'vabd.f32 D0, D0, D0'
* uint32x4_t vabdq_u32 (uint32x4_t, uint32x4_t)
_Form of expected instruction(s):_ 'vabd.u32 Q0, Q0, Q0'
* uint16x8_t vabdq_u16 (uint16x8_t, uint16x8_t)
_Form of expected instruction(s):_ 'vabd.u16 Q0, Q0, Q0'
* uint8x16_t vabdq_u8 (uint8x16_t, uint8x16_t)
_Form of expected instruction(s):_ 'vabd.u8 Q0, Q0, Q0'
* int32x4_t vabdq_s32 (int32x4_t, int32x4_t)
_Form of expected instruction(s):_ 'vabd.s32 Q0, Q0, Q0'
* int16x8_t vabdq_s16 (int16x8_t, int16x8_t)
_Form of expected instruction(s):_ 'vabd.s16 Q0, Q0, Q0'
* int8x16_t vabdq_s8 (int8x16_t, int8x16_t)
_Form of expected instruction(s):_ 'vabd.s8 Q0, Q0, Q0'
* float32x4_t vabdq_f32 (float32x4_t, float32x4_t)
_Form of expected instruction(s):_ 'vabd.f32 Q0, Q0, Q0'
* uint64x2_t vabdl_u32 (uint32x2_t, uint32x2_t)
_Form of expected instruction(s):_ 'vabdl.u32 Q0, D0, D0'
* uint32x4_t vabdl_u16 (uint16x4_t, uint16x4_t)
_Form of expected instruction(s):_ 'vabdl.u16 Q0, D0, D0'
* uint16x8_t vabdl_u8 (uint8x8_t, uint8x8_t)
_Form of expected instruction(s):_ 'vabdl.u8 Q0, D0, D0'
* int64x2_t vabdl_s32 (int32x2_t, int32x2_t)
_Form of expected instruction(s):_ 'vabdl.s32 Q0, D0, D0'
* int32x4_t vabdl_s16 (int16x4_t, int16x4_t)
_Form of expected instruction(s):_ 'vabdl.s16 Q0, D0, D0'
* int16x8_t vabdl_s8 (int8x8_t, int8x8_t)
_Form of expected instruction(s):_ 'vabdl.s8 Q0, D0, D0'
5.50.3.17 Absolute difference and accumulate
............................................
* uint32x2_t vaba_u32 (uint32x2_t, uint32x2_t, uint32x2_t)
_Form of expected instruction(s):_ 'vaba.u32 D0, D0, D0'
* uint16x4_t vaba_u16 (uint16x4_t, uint16x4_t, uint16x4_t)
_Form of expected instruction(s):_ 'vaba.u16 D0, D0, D0'
* uint8x8_t vaba_u8 (uint8x8_t, uint8x8_t, uint8x8_t)
_Form of expected instruction(s):_ 'vaba.u8 D0, D0, D0'
* int32x2_t vaba_s32 (int32x2_t, int32x2_t, int32x2_t)
_Form of expected instruction(s):_ 'vaba.s32 D0, D0, D0'
* int16x4_t vaba_s16 (int16x4_t, int16x4_t, int16x4_t)
_Form of expected instruction(s):_ 'vaba.s16 D0, D0, D0'
* int8x8_t vaba_s8 (int8x8_t, int8x8_t, int8x8_t)
_Form of expected instruction(s):_ 'vaba.s8 D0, D0, D0'
* uint32x4_t vabaq_u32 (uint32x4_t, uint32x4_t, uint32x4_t)
_Form of expected instruction(s):_ 'vaba.u32 Q0, Q0, Q0'
* uint16x8_t vabaq_u16 (uint16x8_t, uint16x8_t, uint16x8_t)
_Form of expected instruction(s):_ 'vaba.u16 Q0, Q0, Q0'
* uint8x16_t vabaq_u8 (uint8x16_t, uint8x16_t, uint8x16_t)
_Form of expected instruction(s):_ 'vaba.u8 Q0, Q0, Q0'
* int32x4_t vabaq_s32 (int32x4_t, int32x4_t, int32x4_t)
_Form of expected instruction(s):_ 'vaba.s32 Q0, Q0, Q0'
* int16x8_t vabaq_s16 (int16x8_t, int16x8_t, int16x8_t)
_Form of expected instruction(s):_ 'vaba.s16 Q0, Q0, Q0'
* int8x16_t vabaq_s8 (int8x16_t, int8x16_t, int8x16_t)
_Form of expected instruction(s):_ 'vaba.s8 Q0, Q0, Q0'
* uint64x2_t vabal_u32 (uint64x2_t, uint32x2_t, uint32x2_t)
_Form of expected instruction(s):_ 'vabal.u32 Q0, D0, D0'
* uint32x4_t vabal_u16 (uint32x4_t, uint16x4_t, uint16x4_t)
_Form of expected instruction(s):_ 'vabal.u16 Q0, D0, D0'
* uint16x8_t vabal_u8 (uint16x8_t, uint8x8_t, uint8x8_t)
_Form of expected instruction(s):_ 'vabal.u8 Q0, D0, D0'
* int64x2_t vabal_s32 (int64x2_t, int32x2_t, int32x2_t)
_Form of expected instruction(s):_ 'vabal.s32 Q0, D0, D0'
* int32x4_t vabal_s16 (int32x4_t, int16x4_t, int16x4_t)
_Form of expected instruction(s):_ 'vabal.s16 Q0, D0, D0'
* int16x8_t vabal_s8 (int16x8_t, int8x8_t, int8x8_t)
_Form of expected instruction(s):_ 'vabal.s8 Q0, D0, D0'
5.50.3.18 Maximum
.................
* uint32x2_t vmax_u32 (uint32x2_t, uint32x2_t)
_Form of expected instruction(s):_ 'vmax.u32 D0, D0, D0'
* uint16x4_t vmax_u16 (uint16x4_t, uint16x4_t)
_Form of expected instruction(s):_ 'vmax.u16 D0, D0, D0'
* uint8x8_t vmax_u8 (uint8x8_t, uint8x8_t)
_Form of expected instruction(s):_ 'vmax.u8 D0, D0, D0'
* int32x2_t vmax_s32 (int32x2_t, int32x2_t)
_Form of expected instruction(s):_ 'vmax.s32 D0, D0, D0'
* int16x4_t vmax_s16 (int16x4_t, int16x4_t)
_Form of expected instruction(s):_ 'vmax.s16 D0, D0, D0'
* int8x8_t vmax_s8 (int8x8_t, int8x8_t)
_Form of expected instruction(s):_ 'vmax.s8 D0, D0, D0'
* float32x2_t vmax_f32 (float32x2_t, float32x2_t)
_Form of expected instruction(s):_ 'vmax.f32 D0, D0, D0'
* uint32x4_t vmaxq_u32 (uint32x4_t, uint32x4_t)
_Form of expected instruction(s):_ 'vmax.u32 Q0, Q0, Q0'
* uint16x8_t vmaxq_u16 (uint16x8_t, uint16x8_t)
_Form of expected instruction(s):_ 'vmax.u16 Q0, Q0, Q0'
* uint8x16_t vmaxq_u8 (uint8x16_t, uint8x16_t)
_Form of expected instruction(s):_ 'vmax.u8 Q0, Q0, Q0'
* int32x4_t vmaxq_s32 (int32x4_t, int32x4_t)
_Form of expected instruction(s):_ 'vmax.s32 Q0, Q0, Q0'
* int16x8_t vmaxq_s16 (int16x8_t, int16x8_t)
_Form of expected instruction(s):_ 'vmax.s16 Q0, Q0, Q0'
* int8x16_t vmaxq_s8 (int8x16_t, int8x16_t)
_Form of expected instruction(s):_ 'vmax.s8 Q0, Q0, Q0'
* float32x4_t vmaxq_f32 (float32x4_t, float32x4_t)
_Form of expected instruction(s):_ 'vmax.f32 Q0, Q0, Q0'
5.50.3.19 Minimum
.................
* uint32x2_t vmin_u32 (uint32x2_t, uint32x2_t)
_Form of expected instruction(s):_ 'vmin.u32 D0, D0, D0'
* uint16x4_t vmin_u16 (uint16x4_t, uint16x4_t)
_Form of expected instruction(s):_ 'vmin.u16 D0, D0, D0'
* uint8x8_t vmin_u8 (uint8x8_t, uint8x8_t)
_Form of expected instruction(s):_ 'vmin.u8 D0, D0, D0'
* int32x2_t vmin_s32 (int32x2_t, int32x2_t)
_Form of expected instruction(s):_ 'vmin.s32 D0, D0, D0'
* int16x4_t vmin_s16 (int16x4_t, int16x4_t)
_Form of expected instruction(s):_ 'vmin.s16 D0, D0, D0'
* int8x8_t vmin_s8 (int8x8_t, int8x8_t)
_Form of expected instruction(s):_ 'vmin.s8 D0, D0, D0'
* float32x2_t vmin_f32 (float32x2_t, float32x2_t)
_Form of expected instruction(s):_ 'vmin.f32 D0, D0, D0'
* uint32x4_t vminq_u32 (uint32x4_t, uint32x4_t)
_Form of expected instruction(s):_ 'vmin.u32 Q0, Q0, Q0'
* uint16x8_t vminq_u16 (uint16x8_t, uint16x8_t)
_Form of expected instruction(s):_ 'vmin.u16 Q0, Q0, Q0'
* uint8x16_t vminq_u8 (uint8x16_t, uint8x16_t)
_Form of expected instruction(s):_ 'vmin.u8 Q0, Q0, Q0'
* int32x4_t vminq_s32 (int32x4_t, int32x4_t)
_Form of expected instruction(s):_ 'vmin.s32 Q0, Q0, Q0'
* int16x8_t vminq_s16 (int16x8_t, int16x8_t)
_Form of expected instruction(s):_ 'vmin.s16 Q0, Q0, Q0'
* int8x16_t vminq_s8 (int8x16_t, int8x16_t)
_Form of expected instruction(s):_ 'vmin.s8 Q0, Q0, Q0'
* float32x4_t vminq_f32 (float32x4_t, float32x4_t)
_Form of expected instruction(s):_ 'vmin.f32 Q0, Q0, Q0'
5.50.3.20 Pairwise add
......................
* uint32x2_t vpadd_u32 (uint32x2_t, uint32x2_t)
_Form of expected instruction(s):_ 'vpadd.i32 D0, D0, D0'
* uint16x4_t vpadd_u16 (uint16x4_t, uint16x4_t)
_Form of expected instruction(s):_ 'vpadd.i16 D0, D0, D0'
* uint8x8_t vpadd_u8 (uint8x8_t, uint8x8_t)
_Form of expected instruction(s):_ 'vpadd.i8 D0, D0, D0'
* int32x2_t vpadd_s32 (int32x2_t, int32x2_t)
_Form of expected instruction(s):_ 'vpadd.i32 D0, D0, D0'
* int16x4_t vpadd_s16 (int16x4_t, int16x4_t)
_Form of expected instruction(s):_ 'vpadd.i16 D0, D0, D0'
* int8x8_t vpadd_s8 (int8x8_t, int8x8_t)
_Form of expected instruction(s):_ 'vpadd.i8 D0, D0, D0'
* float32x2_t vpadd_f32 (float32x2_t, float32x2_t)
_Form of expected instruction(s):_ 'vpadd.f32 D0, D0, D0'
* uint64x1_t vpaddl_u32 (uint32x2_t)
_Form of expected instruction(s):_ 'vpaddl.u32 D0, D0'
* uint32x2_t vpaddl_u16 (uint16x4_t)
_Form of expected instruction(s):_ 'vpaddl.u16 D0, D0'
* uint16x4_t vpaddl_u8 (uint8x8_t)
_Form of expected instruction(s):_ 'vpaddl.u8 D0, D0'
* int64x1_t vpaddl_s32 (int32x2_t)
_Form of expected instruction(s):_ 'vpaddl.s32 D0, D0'
* int32x2_t vpaddl_s16 (int16x4_t)
_Form of expected instruction(s):_ 'vpaddl.s16 D0, D0'
* int16x4_t vpaddl_s8 (int8x8_t)
_Form of expected instruction(s):_ 'vpaddl.s8 D0, D0'
* uint64x2_t vpaddlq_u32 (uint32x4_t)
_Form of expected instruction(s):_ 'vpaddl.u32 Q0, Q0'
* uint32x4_t vpaddlq_u16 (uint16x8_t)
_Form of expected instruction(s):_ 'vpaddl.u16 Q0, Q0'
* uint16x8_t vpaddlq_u8 (uint8x16_t)
_Form of expected instruction(s):_ 'vpaddl.u8 Q0, Q0'
* int64x2_t vpaddlq_s32 (int32x4_t)
_Form of expected instruction(s):_ 'vpaddl.s32 Q0, Q0'
* int32x4_t vpaddlq_s16 (int16x8_t)
_Form of expected instruction(s):_ 'vpaddl.s16 Q0, Q0'
* int16x8_t vpaddlq_s8 (int8x16_t)
_Form of expected instruction(s):_ 'vpaddl.s8 Q0, Q0'
5.50.3.21 Pairwise add, single_opcode widen and accumulate
..........................................................
* uint64x1_t vpadal_u32 (uint64x1_t, uint32x2_t)
_Form of expected instruction(s):_ 'vpadal.u32 D0, D0'
* uint32x2_t vpadal_u16 (uint32x2_t, uint16x4_t)
_Form of expected instruction(s):_ 'vpadal.u16 D0, D0'
* uint16x4_t vpadal_u8 (uint16x4_t, uint8x8_t)
_Form of expected instruction(s):_ 'vpadal.u8 D0, D0'
* int64x1_t vpadal_s32 (int64x1_t, int32x2_t)
_Form of expected instruction(s):_ 'vpadal.s32 D0, D0'
* int32x2_t vpadal_s16 (int32x2_t, int16x4_t)
_Form of expected instruction(s):_ 'vpadal.s16 D0, D0'
* int16x4_t vpadal_s8 (int16x4_t, int8x8_t)
_Form of expected instruction(s):_ 'vpadal.s8 D0, D0'
* uint64x2_t vpadalq_u32 (uint64x2_t, uint32x4_t)
_Form of expected instruction(s):_ 'vpadal.u32 Q0, Q0'
* uint32x4_t vpadalq_u16 (uint32x4_t, uint16x8_t)
_Form of expected instruction(s):_ 'vpadal.u16 Q0, Q0'
* uint16x8_t vpadalq_u8 (uint16x8_t, uint8x16_t)
_Form of expected instruction(s):_ 'vpadal.u8 Q0, Q0'
* int64x2_t vpadalq_s32 (int64x2_t, int32x4_t)
_Form of expected instruction(s):_ 'vpadal.s32 Q0, Q0'
* int32x4_t vpadalq_s16 (int32x4_t, int16x8_t)
_Form of expected instruction(s):_ 'vpadal.s16 Q0, Q0'
* int16x8_t vpadalq_s8 (int16x8_t, int8x16_t)
_Form of expected instruction(s):_ 'vpadal.s8 Q0, Q0'
5.50.3.22 Folding maximum
.........................
* uint32x2_t vpmax_u32 (uint32x2_t, uint32x2_t)
_Form of expected instruction(s):_ 'vpmax.u32 D0, D0, D0'
* uint16x4_t vpmax_u16 (uint16x4_t, uint16x4_t)
_Form of expected instruction(s):_ 'vpmax.u16 D0, D0, D0'
* uint8x8_t vpmax_u8 (uint8x8_t, uint8x8_t)
_Form of expected instruction(s):_ 'vpmax.u8 D0, D0, D0'
* int32x2_t vpmax_s32 (int32x2_t, int32x2_t)
_Form of expected instruction(s):_ 'vpmax.s32 D0, D0, D0'
* int16x4_t vpmax_s16 (int16x4_t, int16x4_t)
_Form of expected instruction(s):_ 'vpmax.s16 D0, D0, D0'
* int8x8_t vpmax_s8 (int8x8_t, int8x8_t)
_Form of expected instruction(s):_ 'vpmax.s8 D0, D0, D0'
* float32x2_t vpmax_f32 (float32x2_t, float32x2_t)
_Form of expected instruction(s):_ 'vpmax.f32 D0, D0, D0'
5.50.3.23 Folding minimum
.........................
* uint32x2_t vpmin_u32 (uint32x2_t, uint32x2_t)
_Form of expected instruction(s):_ 'vpmin.u32 D0, D0, D0'
* uint16x4_t vpmin_u16 (uint16x4_t, uint16x4_t)
_Form of expected instruction(s):_ 'vpmin.u16 D0, D0, D0'
* uint8x8_t vpmin_u8 (uint8x8_t, uint8x8_t)
_Form of expected instruction(s):_ 'vpmin.u8 D0, D0, D0'
* int32x2_t vpmin_s32 (int32x2_t, int32x2_t)
_Form of expected instruction(s):_ 'vpmin.s32 D0, D0, D0'
* int16x4_t vpmin_s16 (int16x4_t, int16x4_t)
_Form of expected instruction(s):_ 'vpmin.s16 D0, D0, D0'
* int8x8_t vpmin_s8 (int8x8_t, int8x8_t)
_Form of expected instruction(s):_ 'vpmin.s8 D0, D0, D0'
* float32x2_t vpmin_f32 (float32x2_t, float32x2_t)
_Form of expected instruction(s):_ 'vpmin.f32 D0, D0, D0'
5.50.3.24 Reciprocal step
.........................
* float32x2_t vrecps_f32 (float32x2_t, float32x2_t)
_Form of expected instruction(s):_ 'vrecps.f32 D0, D0, D0'
* float32x4_t vrecpsq_f32 (float32x4_t, float32x4_t)
_Form of expected instruction(s):_ 'vrecps.f32 Q0, Q0, Q0'
* float32x2_t vrsqrts_f32 (float32x2_t, float32x2_t)
_Form of expected instruction(s):_ 'vrsqrts.f32 D0, D0, D0'
* float32x4_t vrsqrtsq_f32 (float32x4_t, float32x4_t)
_Form of expected instruction(s):_ 'vrsqrts.f32 Q0, Q0, Q0'
5.50.3.25 Vector shift left
...........................
* uint32x2_t vshl_u32 (uint32x2_t, int32x2_t)
_Form of expected instruction(s):_ 'vshl.u32 D0, D0, D0'
* uint16x4_t vshl_u16 (uint16x4_t, int16x4_t)
_Form of expected instruction(s):_ 'vshl.u16 D0, D0, D0'
* uint8x8_t vshl_u8 (uint8x8_t, int8x8_t)
_Form of expected instruction(s):_ 'vshl.u8 D0, D0, D0'
* int32x2_t vshl_s32 (int32x2_t, int32x2_t)
_Form of expected instruction(s):_ 'vshl.s32 D0, D0, D0'
* int16x4_t vshl_s16 (int16x4_t, int16x4_t)
_Form of expected instruction(s):_ 'vshl.s16 D0, D0, D0'
* int8x8_t vshl_s8 (int8x8_t, int8x8_t)
_Form of expected instruction(s):_ 'vshl.s8 D0, D0, D0'
* uint64x1_t vshl_u64 (uint64x1_t, int64x1_t)
_Form of expected instruction(s):_ 'vshl.u64 D0, D0, D0'
* int64x1_t vshl_s64 (int64x1_t, int64x1_t)
_Form of expected instruction(s):_ 'vshl.s64 D0, D0, D0'
* uint32x4_t vshlq_u32 (uint32x4_t, int32x4_t)
_Form of expected instruction(s):_ 'vshl.u32 Q0, Q0, Q0'
* uint16x8_t vshlq_u16 (uint16x8_t, int16x8_t)
_Form of expected instruction(s):_ 'vshl.u16 Q0, Q0, Q0'
* uint8x16_t vshlq_u8 (uint8x16_t, int8x16_t)
_Form of expected instruction(s):_ 'vshl.u8 Q0, Q0, Q0'
* int32x4_t vshlq_s32 (int32x4_t, int32x4_t)
_Form of expected instruction(s):_ 'vshl.s32 Q0, Q0, Q0'
* int16x8_t vshlq_s16 (int16x8_t, int16x8_t)
_Form of expected instruction(s):_ 'vshl.s16 Q0, Q0, Q0'
* int8x16_t vshlq_s8 (int8x16_t, int8x16_t)
_Form of expected instruction(s):_ 'vshl.s8 Q0, Q0, Q0'
* uint64x2_t vshlq_u64 (uint64x2_t, int64x2_t)
_Form of expected instruction(s):_ 'vshl.u64 Q0, Q0, Q0'
* int64x2_t vshlq_s64 (int64x2_t, int64x2_t)
_Form of expected instruction(s):_ 'vshl.s64 Q0, Q0, Q0'
* uint32x2_t vrshl_u32 (uint32x2_t, int32x2_t)
_Form of expected instruction(s):_ 'vrshl.u32 D0, D0, D0'
* uint16x4_t vrshl_u16 (uint16x4_t, int16x4_t)
_Form of expected instruction(s):_ 'vrshl.u16 D0, D0, D0'
* uint8x8_t vrshl_u8 (uint8x8_t, int8x8_t)
_Form of expected instruction(s):_ 'vrshl.u8 D0, D0, D0'
* int32x2_t vrshl_s32 (int32x2_t, int32x2_t)
_Form of expected instruction(s):_ 'vrshl.s32 D0, D0, D0'
* int16x4_t vrshl_s16 (int16x4_t, int16x4_t)
_Form of expected instruction(s):_ 'vrshl.s16 D0, D0, D0'
* int8x8_t vrshl_s8 (int8x8_t, int8x8_t)
_Form of expected instruction(s):_ 'vrshl.s8 D0, D0, D0'
* uint64x1_t vrshl_u64 (uint64x1_t, int64x1_t)
_Form of expected instruction(s):_ 'vrshl.u64 D0, D0, D0'
* int64x1_t vrshl_s64 (int64x1_t, int64x1_t)
_Form of expected instruction(s):_ 'vrshl.s64 D0, D0, D0'
* uint32x4_t vrshlq_u32 (uint32x4_t, int32x4_t)
_Form of expected instruction(s):_ 'vrshl.u32 Q0, Q0, Q0'
* uint16x8_t vrshlq_u16 (uint16x8_t, int16x8_t)
_Form of expected instruction(s):_ 'vrshl.u16 Q0, Q0, Q0'
* uint8x16_t vrshlq_u8 (uint8x16_t, int8x16_t)
_Form of expected instruction(s):_ 'vrshl.u8 Q0, Q0, Q0'
* int32x4_t vrshlq_s32 (int32x4_t, int32x4_t)
_Form of expected instruction(s):_ 'vrshl.s32 Q0, Q0, Q0'
* int16x8_t vrshlq_s16 (int16x8_t, int16x8_t)
_Form of expected instruction(s):_ 'vrshl.s16 Q0, Q0, Q0'
* int8x16_t vrshlq_s8 (int8x16_t, int8x16_t)
_Form of expected instruction(s):_ 'vrshl.s8 Q0, Q0, Q0'
* uint64x2_t vrshlq_u64 (uint64x2_t, int64x2_t)
_Form of expected instruction(s):_ 'vrshl.u64 Q0, Q0, Q0'
* int64x2_t vrshlq_s64 (int64x2_t, int64x2_t)
_Form of expected instruction(s):_ 'vrshl.s64 Q0, Q0, Q0'
* uint32x2_t vqshl_u32 (uint32x2_t, int32x2_t)
_Form of expected instruction(s):_ 'vqshl.u32 D0, D0, D0'
* uint16x4_t vqshl_u16 (uint16x4_t, int16x4_t)
_Form of expected instruction(s):_ 'vqshl.u16 D0, D0, D0'
* uint8x8_t vqshl_u8 (uint8x8_t, int8x8_t)
_Form of expected instruction(s):_ 'vqshl.u8 D0, D0, D0'
* int32x2_t vqshl_s32 (int32x2_t, int32x2_t)
_Form of expected instruction(s):_ 'vqshl.s32 D0, D0, D0'
* int16x4_t vqshl_s16 (int16x4_t, int16x4_t)
_Form of expected instruction(s):_ 'vqshl.s16 D0, D0, D0'
* int8x8_t vqshl_s8 (int8x8_t, int8x8_t)
_Form of expected instruction(s):_ 'vqshl.s8 D0, D0, D0'
* uint64x1_t vqshl_u64 (uint64x1_t, int64x1_t)
_Form of expected instruction(s):_ 'vqshl.u64 D0, D0, D0'
* int64x1_t vqshl_s64 (int64x1_t, int64x1_t)
_Form of expected instruction(s):_ 'vqshl.s64 D0, D0, D0'
* uint32x4_t vqshlq_u32 (uint32x4_t, int32x4_t)
_Form of expected instruction(s):_ 'vqshl.u32 Q0, Q0, Q0'
* uint16x8_t vqshlq_u16 (uint16x8_t, int16x8_t)
_Form of expected instruction(s):_ 'vqshl.u16 Q0, Q0, Q0'
* uint8x16_t vqshlq_u8 (uint8x16_t, int8x16_t)
_Form of expected instruction(s):_ 'vqshl.u8 Q0, Q0, Q0'
* int32x4_t vqshlq_s32 (int32x4_t, int32x4_t)
_Form of expected instruction(s):_ 'vqshl.s32 Q0, Q0, Q0'
* int16x8_t vqshlq_s16 (int16x8_t, int16x8_t)
_Form of expected instruction(s):_ 'vqshl.s16 Q0, Q0, Q0'
* int8x16_t vqshlq_s8 (int8x16_t, int8x16_t)
_Form of expected instruction(s):_ 'vqshl.s8 Q0, Q0, Q0'
* uint64x2_t vqshlq_u64 (uint64x2_t, int64x2_t)
_Form of expected instruction(s):_ 'vqshl.u64 Q0, Q0, Q0'
* int64x2_t vqshlq_s64 (int64x2_t, int64x2_t)
_Form of expected instruction(s):_ 'vqshl.s64 Q0, Q0, Q0'
* uint32x2_t vqrshl_u32 (uint32x2_t, int32x2_t)
_Form of expected instruction(s):_ 'vqrshl.u32 D0, D0, D0'
* uint16x4_t vqrshl_u16 (uint16x4_t, int16x4_t)
_Form of expected instruction(s):_ 'vqrshl.u16 D0, D0, D0'
* uint8x8_t vqrshl_u8 (uint8x8_t, int8x8_t)
_Form of expected instruction(s):_ 'vqrshl.u8 D0, D0, D0'
* int32x2_t vqrshl_s32 (int32x2_t, int32x2_t)
_Form of expected instruction(s):_ 'vqrshl.s32 D0, D0, D0'
* int16x4_t vqrshl_s16 (int16x4_t, int16x4_t)
_Form of expected instruction(s):_ 'vqrshl.s16 D0, D0, D0'
* int8x8_t vqrshl_s8 (int8x8_t, int8x8_t)
_Form of expected instruction(s):_ 'vqrshl.s8 D0, D0, D0'
* uint64x1_t vqrshl_u64 (uint64x1_t, int64x1_t)
_Form of expected instruction(s):_ 'vqrshl.u64 D0, D0, D0'
* int64x1_t vqrshl_s64 (int64x1_t, int64x1_t)
_Form of expected instruction(s):_ 'vqrshl.s64 D0, D0, D0'
* uint32x4_t vqrshlq_u32 (uint32x4_t, int32x4_t)
_Form of expected instruction(s):_ 'vqrshl.u32 Q0, Q0, Q0'
* uint16x8_t vqrshlq_u16 (uint16x8_t, int16x8_t)
_Form of expected instruction(s):_ 'vqrshl.u16 Q0, Q0, Q0'
* uint8x16_t vqrshlq_u8 (uint8x16_t, int8x16_t)
_Form of expected instruction(s):_ 'vqrshl.u8 Q0, Q0, Q0'
* int32x4_t vqrshlq_s32 (int32x4_t, int32x4_t)
_Form of expected instruction(s):_ 'vqrshl.s32 Q0, Q0, Q0'
* int16x8_t vqrshlq_s16 (int16x8_t, int16x8_t)
_Form of expected instruction(s):_ 'vqrshl.s16 Q0, Q0, Q0'
* int8x16_t vqrshlq_s8 (int8x16_t, int8x16_t)
_Form of expected instruction(s):_ 'vqrshl.s8 Q0, Q0, Q0'
* uint64x2_t vqrshlq_u64 (uint64x2_t, int64x2_t)
_Form of expected instruction(s):_ 'vqrshl.u64 Q0, Q0, Q0'
* int64x2_t vqrshlq_s64 (int64x2_t, int64x2_t)
_Form of expected instruction(s):_ 'vqrshl.s64 Q0, Q0, Q0'
5.50.3.26 Vector shift left by constant
.......................................
* uint32x2_t vshl_n_u32 (uint32x2_t, const int)
_Form of expected instruction(s):_ 'vshl.i32 D0, D0, #0'
* uint16x4_t vshl_n_u16 (uint16x4_t, const int)
_Form of expected instruction(s):_ 'vshl.i16 D0, D0, #0'
* uint8x8_t vshl_n_u8 (uint8x8_t, const int)
_Form of expected instruction(s):_ 'vshl.i8 D0, D0, #0'
* int32x2_t vshl_n_s32 (int32x2_t, const int)
_Form of expected instruction(s):_ 'vshl.i32 D0, D0, #0'
* int16x4_t vshl_n_s16 (int16x4_t, const int)
_Form of expected instruction(s):_ 'vshl.i16 D0, D0, #0'
* int8x8_t vshl_n_s8 (int8x8_t, const int)
_Form of expected instruction(s):_ 'vshl.i8 D0, D0, #0'
* uint64x1_t vshl_n_u64 (uint64x1_t, const int)
_Form of expected instruction(s):_ 'vshl.i64 D0, D0, #0'
* int64x1_t vshl_n_s64 (int64x1_t, const int)
_Form of expected instruction(s):_ 'vshl.i64 D0, D0, #0'
* uint32x4_t vshlq_n_u32 (uint32x4_t, const int)
_Form of expected instruction(s):_ 'vshl.i32 Q0, Q0, #0'
* uint16x8_t vshlq_n_u16 (uint16x8_t, const int)
_Form of expected instruction(s):_ 'vshl.i16 Q0, Q0, #0'
* uint8x16_t vshlq_n_u8 (uint8x16_t, const int)
_Form of expected instruction(s):_ 'vshl.i8 Q0, Q0, #0'
* int32x4_t vshlq_n_s32 (int32x4_t, const int)
_Form of expected instruction(s):_ 'vshl.i32 Q0, Q0, #0'
* int16x8_t vshlq_n_s16 (int16x8_t, const int)
_Form of expected instruction(s):_ 'vshl.i16 Q0, Q0, #0'
* int8x16_t vshlq_n_s8 (int8x16_t, const int)
_Form of expected instruction(s):_ 'vshl.i8 Q0, Q0, #0'
* uint64x2_t vshlq_n_u64 (uint64x2_t, const int)
_Form of expected instruction(s):_ 'vshl.i64 Q0, Q0, #0'
* int64x2_t vshlq_n_s64 (int64x2_t, const int)
_Form of expected instruction(s):_ 'vshl.i64 Q0, Q0, #0'
* uint32x2_t vqshl_n_u32 (uint32x2_t, const int)
_Form of expected instruction(s):_ 'vqshl.u32 D0, D0, #0'
* uint16x4_t vqshl_n_u16 (uint16x4_t, const int)
_Form of expected instruction(s):_ 'vqshl.u16 D0, D0, #0'
* uint8x8_t vqshl_n_u8 (uint8x8_t, const int)
_Form of expected instruction(s):_ 'vqshl.u8 D0, D0, #0'
* int32x2_t vqshl_n_s32 (int32x2_t, const int)
_Form of expected instruction(s):_ 'vqshl.s32 D0, D0, #0'
* int16x4_t vqshl_n_s16 (int16x4_t, const int)
_Form of expected instruction(s):_ 'vqshl.s16 D0, D0, #0'
* int8x8_t vqshl_n_s8 (int8x8_t, const int)
_Form of expected instruction(s):_ 'vqshl.s8 D0, D0, #0'
* uint64x1_t vqshl_n_u64 (uint64x1_t, const int)
_Form of expected instruction(s):_ 'vqshl.u64 D0, D0, #0'
* int64x1_t vqshl_n_s64 (int64x1_t, const int)
_Form of expected instruction(s):_ 'vqshl.s64 D0, D0, #0'
* uint32x4_t vqshlq_n_u32 (uint32x4_t, const int)
_Form of expected instruction(s):_ 'vqshl.u32 Q0, Q0, #0'
* uint16x8_t vqshlq_n_u16 (uint16x8_t, const int)
_Form of expected instruction(s):_ 'vqshl.u16 Q0, Q0, #0'
* uint8x16_t vqshlq_n_u8 (uint8x16_t, const int)
_Form of expected instruction(s):_ 'vqshl.u8 Q0, Q0, #0'
* int32x4_t vqshlq_n_s32 (int32x4_t, const int)
_Form of expected instruction(s):_ 'vqshl.s32 Q0, Q0, #0'
* int16x8_t vqshlq_n_s16 (int16x8_t, const int)
_Form of expected instruction(s):_ 'vqshl.s16 Q0, Q0, #0'
* int8x16_t vqshlq_n_s8 (int8x16_t, const int)
_Form of expected instruction(s):_ 'vqshl.s8 Q0, Q0, #0'
* uint64x2_t vqshlq_n_u64 (uint64x2_t, const int)
_Form of expected instruction(s):_ 'vqshl.u64 Q0, Q0, #0'
* int64x2_t vqshlq_n_s64 (int64x2_t, const int)
_Form of expected instruction(s):_ 'vqshl.s64 Q0, Q0, #0'
* uint64x1_t vqshlu_n_s64 (int64x1_t, const int)
_Form of expected instruction(s):_ 'vqshlu.s64 D0, D0, #0'
* uint32x2_t vqshlu_n_s32 (int32x2_t, const int)
_Form of expected instruction(s):_ 'vqshlu.s32 D0, D0, #0'
* uint16x4_t vqshlu_n_s16 (int16x4_t, const int)
_Form of expected instruction(s):_ 'vqshlu.s16 D0, D0, #0'
* uint8x8_t vqshlu_n_s8 (int8x8_t, const int)
_Form of expected instruction(s):_ 'vqshlu.s8 D0, D0, #0'
* uint64x2_t vqshluq_n_s64 (int64x2_t, const int)
_Form of expected instruction(s):_ 'vqshlu.s64 Q0, Q0, #0'
* uint32x4_t vqshluq_n_s32 (int32x4_t, const int)
_Form of expected instruction(s):_ 'vqshlu.s32 Q0, Q0, #0'
* uint16x8_t vqshluq_n_s16 (int16x8_t, const int)
_Form of expected instruction(s):_ 'vqshlu.s16 Q0, Q0, #0'
* uint8x16_t vqshluq_n_s8 (int8x16_t, const int)
_Form of expected instruction(s):_ 'vqshlu.s8 Q0, Q0, #0'
* uint64x2_t vshll_n_u32 (uint32x2_t, const int)
_Form of expected instruction(s):_ 'vshll.u32 Q0, D0, #0'
* uint32x4_t vshll_n_u16 (uint16x4_t, const int)
_Form of expected instruction(s):_ 'vshll.u16 Q0, D0, #0'
* uint16x8_t vshll_n_u8 (uint8x8_t, const int)
_Form of expected instruction(s):_ 'vshll.u8 Q0, D0, #0'
* int64x2_t vshll_n_s32 (int32x2_t, const int)
_Form of expected instruction(s):_ 'vshll.s32 Q0, D0, #0'
* int32x4_t vshll_n_s16 (int16x4_t, const int)
_Form of expected instruction(s):_ 'vshll.s16 Q0, D0, #0'
* int16x8_t vshll_n_s8 (int8x8_t, const int)
_Form of expected instruction(s):_ 'vshll.s8 Q0, D0, #0'
5.50.3.27 Vector shift right by constant
........................................
* uint32x2_t vshr_n_u32 (uint32x2_t, const int)
_Form of expected instruction(s):_ 'vshr.u32 D0, D0, #0'
* uint16x4_t vshr_n_u16 (uint16x4_t, const int)
_Form of expected instruction(s):_ 'vshr.u16 D0, D0, #0'
* uint8x8_t vshr_n_u8 (uint8x8_t, const int)
_Form of expected instruction(s):_ 'vshr.u8 D0, D0, #0'
* int32x2_t vshr_n_s32 (int32x2_t, const int)
_Form of expected instruction(s):_ 'vshr.s32 D0, D0, #0'
* int16x4_t vshr_n_s16 (int16x4_t, const int)
_Form of expected instruction(s):_ 'vshr.s16 D0, D0, #0'
* int8x8_t vshr_n_s8 (int8x8_t, const int)
_Form of expected instruction(s):_ 'vshr.s8 D0, D0, #0'
* uint64x1_t vshr_n_u64 (uint64x1_t, const int)
_Form of expected instruction(s):_ 'vshr.u64 D0, D0, #0'
* int64x1_t vshr_n_s64 (int64x1_t, const int)
_Form of expected instruction(s):_ 'vshr.s64 D0, D0, #0'
* uint32x4_t vshrq_n_u32 (uint32x4_t, const int)
_Form of expected instruction(s):_ 'vshr.u32 Q0, Q0, #0'
* uint16x8_t vshrq_n_u16 (uint16x8_t, const int)
_Form of expected instruction(s):_ 'vshr.u16 Q0, Q0, #0'
* uint8x16_t vshrq_n_u8 (uint8x16_t, const int)
_Form of expected instruction(s):_ 'vshr.u8 Q0, Q0, #0'
* int32x4_t vshrq_n_s32 (int32x4_t, const int)
_Form of expected instruction(s):_ 'vshr.s32 Q0, Q0, #0'
* int16x8_t vshrq_n_s16 (int16x8_t, const int)
_Form of expected instruction(s):_ 'vshr.s16 Q0, Q0, #0'
* int8x16_t vshrq_n_s8 (int8x16_t, const int)
_Form of expected instruction(s):_ 'vshr.s8 Q0, Q0, #0'
* uint64x2_t vshrq_n_u64 (uint64x2_t, const int)
_Form of expected instruction(s):_ 'vshr.u64 Q0, Q0, #0'
* int64x2_t vshrq_n_s64 (int64x2_t, const int)
_Form of expected instruction(s):_ 'vshr.s64 Q0, Q0, #0'
* uint32x2_t vrshr_n_u32 (uint32x2_t, const int)
_Form of expected instruction(s):_ 'vrshr.u32 D0, D0, #0'
* uint16x4_t vrshr_n_u16 (uint16x4_t, const int)
_Form of expected instruction(s):_ 'vrshr.u16 D0, D0, #0'
* uint8x8_t vrshr_n_u8 (uint8x8_t, const int)
_Form of expected instruction(s):_ 'vrshr.u8 D0, D0, #0'
* int32x2_t vrshr_n_s32 (int32x2_t, const int)
_Form of expected instruction(s):_ 'vrshr.s32 D0, D0, #0'
* int16x4_t vrshr_n_s16 (int16x4_t, const int)
_Form of expected instruction(s):_ 'vrshr.s16 D0, D0, #0'
* int8x8_t vrshr_n_s8 (int8x8_t, const int)
_Form of expected instruction(s):_ 'vrshr.s8 D0, D0, #0'
* uint64x1_t vrshr_n_u64 (uint64x1_t, const int)
_Form of expected instruction(s):_ 'vrshr.u64 D0, D0, #0'
* int64x1_t vrshr_n_s64 (int64x1_t, const int)
_Form of expected instruction(s):_ 'vrshr.s64 D0, D0, #0'
* uint32x4_t vrshrq_n_u32 (uint32x4_t, const int)
_Form of expected instruction(s):_ 'vrshr.u32 Q0, Q0, #0'
* uint16x8_t vrshrq_n_u16 (uint16x8_t, const int)
_Form of expected instruction(s):_ 'vrshr.u16 Q0, Q0, #0'
* uint8x16_t vrshrq_n_u8 (uint8x16_t, const int)
_Form of expected instruction(s):_ 'vrshr.u8 Q0, Q0, #0'
* int32x4_t vrshrq_n_s32 (int32x4_t, const int)
_Form of expected instruction(s):_ 'vrshr.s32 Q0, Q0, #0'
* int16x8_t vrshrq_n_s16 (int16x8_t, const int)
_Form of expected instruction(s):_ 'vrshr.s16 Q0, Q0, #0'
* int8x16_t vrshrq_n_s8 (int8x16_t, const int)
_Form of expected instruction(s):_ 'vrshr.s8 Q0, Q0, #0'
* uint64x2_t vrshrq_n_u64 (uint64x2_t, const int)
_Form of expected instruction(s):_ 'vrshr.u64 Q0, Q0, #0'
* int64x2_t vrshrq_n_s64 (int64x2_t, const int)
_Form of expected instruction(s):_ 'vrshr.s64 Q0, Q0, #0'
* uint32x2_t vshrn_n_u64 (uint64x2_t, const int)
_Form of expected instruction(s):_ 'vshrn.i64 D0, Q0, #0'
* uint16x4_t vshrn_n_u32 (uint32x4_t, const int)
_Form of expected instruction(s):_ 'vshrn.i32 D0, Q0, #0'
* uint8x8_t vshrn_n_u16 (uint16x8_t, const int)
_Form of expected instruction(s):_ 'vshrn.i16 D0, Q0, #0'
* int32x2_t vshrn_n_s64 (int64x2_t, const int)
_Form of expected instruction(s):_ 'vshrn.i64 D0, Q0, #0'
* int16x4_t vshrn_n_s32 (int32x4_t, const int)
_Form of expected instruction(s):_ 'vshrn.i32 D0, Q0, #0'
* int8x8_t vshrn_n_s16 (int16x8_t, const int)
_Form of expected instruction(s):_ 'vshrn.i16 D0, Q0, #0'
* uint32x2_t vrshrn_n_u64 (uint64x2_t, const int)
_Form of expected instruction(s):_ 'vrshrn.i64 D0, Q0, #0'
* uint16x4_t vrshrn_n_u32 (uint32x4_t, const int)
_Form of expected instruction(s):_ 'vrshrn.i32 D0, Q0, #0'
* uint8x8_t vrshrn_n_u16 (uint16x8_t, const int)
_Form of expected instruction(s):_ 'vrshrn.i16 D0, Q0, #0'
* int32x2_t vrshrn_n_s64 (int64x2_t, const int)
_Form of expected instruction(s):_ 'vrshrn.i64 D0, Q0, #0'
* int16x4_t vrshrn_n_s32 (int32x4_t, const int)
_Form of expected instruction(s):_ 'vrshrn.i32 D0, Q0, #0'
* int8x8_t vrshrn_n_s16 (int16x8_t, const int)
_Form of expected instruction(s):_ 'vrshrn.i16 D0, Q0, #0'
* uint32x2_t vqshrn_n_u64 (uint64x2_t, const int)
_Form of expected instruction(s):_ 'vqshrn.u64 D0, Q0, #0'
* uint16x4_t vqshrn_n_u32 (uint32x4_t, const int)
_Form of expected instruction(s):_ 'vqshrn.u32 D0, Q0, #0'
* uint8x8_t vqshrn_n_u16 (uint16x8_t, const int)
_Form of expected instruction(s):_ 'vqshrn.u16 D0, Q0, #0'
* int32x2_t vqshrn_n_s64 (int64x2_t, const int)
_Form of expected instruction(s):_ 'vqshrn.s64 D0, Q0, #0'
* int16x4_t vqshrn_n_s32 (int32x4_t, const int)
_Form of expected instruction(s):_ 'vqshrn.s32 D0, Q0, #0'
* int8x8_t vqshrn_n_s16 (int16x8_t, const int)
_Form of expected instruction(s):_ 'vqshrn.s16 D0, Q0, #0'
* uint32x2_t vqrshrn_n_u64 (uint64x2_t, const int)
_Form of expected instruction(s):_ 'vqrshrn.u64 D0, Q0, #0'
* uint16x4_t vqrshrn_n_u32 (uint32x4_t, const int)
_Form of expected instruction(s):_ 'vqrshrn.u32 D0, Q0, #0'
* uint8x8_t vqrshrn_n_u16 (uint16x8_t, const int)
_Form of expected instruction(s):_ 'vqrshrn.u16 D0, Q0, #0'
* int32x2_t vqrshrn_n_s64 (int64x2_t, const int)
_Form of expected instruction(s):_ 'vqrshrn.s64 D0, Q0, #0'
* int16x4_t vqrshrn_n_s32 (int32x4_t, const int)
_Form of expected instruction(s):_ 'vqrshrn.s32 D0, Q0, #0'
* int8x8_t vqrshrn_n_s16 (int16x8_t, const int)
_Form of expected instruction(s):_ 'vqrshrn.s16 D0, Q0, #0'
* uint32x2_t vqshrun_n_s64 (int64x2_t, const int)
_Form of expected instruction(s):_ 'vqshrun.s64 D0, Q0, #0'
* uint16x4_t vqshrun_n_s32 (int32x4_t, const int)
_Form of expected instruction(s):_ 'vqshrun.s32 D0, Q0, #0'
* uint8x8_t vqshrun_n_s16 (int16x8_t, const int)
_Form of expected instruction(s):_ 'vqshrun.s16 D0, Q0, #0'
* uint32x2_t vqrshrun_n_s64 (int64x2_t, const int)
_Form of expected instruction(s):_ 'vqrshrun.s64 D0, Q0, #0'
* uint16x4_t vqrshrun_n_s32 (int32x4_t, const int)
_Form of expected instruction(s):_ 'vqrshrun.s32 D0, Q0, #0'
* uint8x8_t vqrshrun_n_s16 (int16x8_t, const int)
_Form of expected instruction(s):_ 'vqrshrun.s16 D0, Q0, #0'
5.50.3.28 Vector shift right by constant and accumulate
.......................................................
* uint32x2_t vsra_n_u32 (uint32x2_t, uint32x2_t, const int)
_Form of expected instruction(s):_ 'vsra.u32 D0, D0, #0'
* uint16x4_t vsra_n_u16 (uint16x4_t, uint16x4_t, const int)
_Form of expected instruction(s):_ 'vsra.u16 D0, D0, #0'
* uint8x8_t vsra_n_u8 (uint8x8_t, uint8x8_t, const int)
_Form of expected instruction(s):_ 'vsra.u8 D0, D0, #0'
* int32x2_t vsra_n_s32 (int32x2_t, int32x2_t, const int)
_Form of expected instruction(s):_ 'vsra.s32 D0, D0, #0'
* int16x4_t vsra_n_s16 (int16x4_t, int16x4_t, const int)
_Form of expected instruction(s):_ 'vsra.s16 D0, D0, #0'
* int8x8_t vsra_n_s8 (int8x8_t, int8x8_t, const int)
_Form of expected instruction(s):_ 'vsra.s8 D0, D0, #0'
* uint64x1_t vsra_n_u64 (uint64x1_t, uint64x1_t, const int)
_Form of expected instruction(s):_ 'vsra.u64 D0, D0, #0'
* int64x1_t vsra_n_s64 (int64x1_t, int64x1_t, const int)
_Form of expected instruction(s):_ 'vsra.s64 D0, D0, #0'
* uint32x4_t vsraq_n_u32 (uint32x4_t, uint32x4_t, const int)
_Form of expected instruction(s):_ 'vsra.u32 Q0, Q0, #0'
* uint16x8_t vsraq_n_u16 (uint16x8_t, uint16x8_t, const int)
_Form of expected instruction(s):_ 'vsra.u16 Q0, Q0, #0'
* uint8x16_t vsraq_n_u8 (uint8x16_t, uint8x16_t, const int)
_Form of expected instruction(s):_ 'vsra.u8 Q0, Q0, #0'
* int32x4_t vsraq_n_s32 (int32x4_t, int32x4_t, const int)
_Form of expected instruction(s):_ 'vsra.s32 Q0, Q0, #0'
* int16x8_t vsraq_n_s16 (int16x8_t, int16x8_t, const int)
_Form of expected instruction(s):_ 'vsra.s16 Q0, Q0, #0'
* int8x16_t vsraq_n_s8 (int8x16_t, int8x16_t, const int)
_Form of expected instruction(s):_ 'vsra.s8 Q0, Q0, #0'
* uint64x2_t vsraq_n_u64 (uint64x2_t, uint64x2_t, const int)
_Form of expected instruction(s):_ 'vsra.u64 Q0, Q0, #0'
* int64x2_t vsraq_n_s64 (int64x2_t, int64x2_t, const int)
_Form of expected instruction(s):_ 'vsra.s64 Q0, Q0, #0'
* uint32x2_t vrsra_n_u32 (uint32x2_t, uint32x2_t, const int)
_Form of expected instruction(s):_ 'vrsra.u32 D0, D0, #0'
* uint16x4_t vrsra_n_u16 (uint16x4_t, uint16x4_t, const int)
_Form of expected instruction(s):_ 'vrsra.u16 D0, D0, #0'
* uint8x8_t vrsra_n_u8 (uint8x8_t, uint8x8_t, const int)
_Form of expected instruction(s):_ 'vrsra.u8 D0, D0, #0'
* int32x2_t vrsra_n_s32 (int32x2_t, int32x2_t, const int)
_Form of expected instruction(s):_ 'vrsra.s32 D0, D0, #0'
* int16x4_t vrsra_n_s16 (int16x4_t, int16x4_t, const int)
_Form of expected instruction(s):_ 'vrsra.s16 D0, D0, #0'
* int8x8_t vrsra_n_s8 (int8x8_t, int8x8_t, const int)
_Form of expected instruction(s):_ 'vrsra.s8 D0, D0, #0'
* uint64x1_t vrsra_n_u64 (uint64x1_t, uint64x1_t, const int)
_Form of expected instruction(s):_ 'vrsra.u64 D0, D0, #0'
* int64x1_t vrsra_n_s64 (int64x1_t, int64x1_t, const int)
_Form of expected instruction(s):_ 'vrsra.s64 D0, D0, #0'
* uint32x4_t vrsraq_n_u32 (uint32x4_t, uint32x4_t, const int)
_Form of expected instruction(s):_ 'vrsra.u32 Q0, Q0, #0'
* uint16x8_t vrsraq_n_u16 (uint16x8_t, uint16x8_t, const int)
_Form of expected instruction(s):_ 'vrsra.u16 Q0, Q0, #0'
* uint8x16_t vrsraq_n_u8 (uint8x16_t, uint8x16_t, const int)
_Form of expected instruction(s):_ 'vrsra.u8 Q0, Q0, #0'
* int32x4_t vrsraq_n_s32 (int32x4_t, int32x4_t, const int)
_Form of expected instruction(s):_ 'vrsra.s32 Q0, Q0, #0'
* int16x8_t vrsraq_n_s16 (int16x8_t, int16x8_t, const int)
_Form of expected instruction(s):_ 'vrsra.s16 Q0, Q0, #0'
* int8x16_t vrsraq_n_s8 (int8x16_t, int8x16_t, const int)
_Form of expected instruction(s):_ 'vrsra.s8 Q0, Q0, #0'
* uint64x2_t vrsraq_n_u64 (uint64x2_t, uint64x2_t, const int)
_Form of expected instruction(s):_ 'vrsra.u64 Q0, Q0, #0'
* int64x2_t vrsraq_n_s64 (int64x2_t, int64x2_t, const int)
_Form of expected instruction(s):_ 'vrsra.s64 Q0, Q0, #0'
5.50.3.29 Vector shift right and insert
.......................................
* uint32x2_t vsri_n_u32 (uint32x2_t, uint32x2_t, const int)
_Form of expected instruction(s):_ 'vsri.32 D0, D0, #0'
* uint16x4_t vsri_n_u16 (uint16x4_t, uint16x4_t, const int)
_Form of expected instruction(s):_ 'vsri.16 D0, D0, #0'
* uint8x8_t vsri_n_u8 (uint8x8_t, uint8x8_t, const int)
_Form of expected instruction(s):_ 'vsri.8 D0, D0, #0'
* int32x2_t vsri_n_s32 (int32x2_t, int32x2_t, const int)
_Form of expected instruction(s):_ 'vsri.32 D0, D0, #0'
* int16x4_t vsri_n_s16 (int16x4_t, int16x4_t, const int)
_Form of expected instruction(s):_ 'vsri.16 D0, D0, #0'
* int8x8_t vsri_n_s8 (int8x8_t, int8x8_t, const int)
_Form of expected instruction(s):_ 'vsri.8 D0, D0, #0'
* uint64x1_t vsri_n_u64 (uint64x1_t, uint64x1_t, const int)
_Form of expected instruction(s):_ 'vsri.64 D0, D0, #0'
* int64x1_t vsri_n_s64 (int64x1_t, int64x1_t, const int)
_Form of expected instruction(s):_ 'vsri.64 D0, D0, #0'
* poly16x4_t vsri_n_p16 (poly16x4_t, poly16x4_t, const int)
_Form of expected instruction(s):_ 'vsri.16 D0, D0, #0'
* poly8x8_t vsri_n_p8 (poly8x8_t, poly8x8_t, const int)
_Form of expected instruction(s):_ 'vsri.8 D0, D0, #0'
* uint32x4_t vsriq_n_u32 (uint32x4_t, uint32x4_t, const int)
_Form of expected instruction(s):_ 'vsri.32 Q0, Q0, #0'
* uint16x8_t vsriq_n_u16 (uint16x8_t, uint16x8_t, const int)
_Form of expected instruction(s):_ 'vsri.16 Q0, Q0, #0'
* uint8x16_t vsriq_n_u8 (uint8x16_t, uint8x16_t, const int)
_Form of expected instruction(s):_ 'vsri.8 Q0, Q0, #0'
* int32x4_t vsriq_n_s32 (int32x4_t, int32x4_t, const int)
_Form of expected instruction(s):_ 'vsri.32 Q0, Q0, #0'
* int16x8_t vsriq_n_s16 (int16x8_t, int16x8_t, const int)
_Form of expected instruction(s):_ 'vsri.16 Q0, Q0, #0'
* int8x16_t vsriq_n_s8 (int8x16_t, int8x16_t, const int)
_Form of expected instruction(s):_ 'vsri.8 Q0, Q0, #0'
* uint64x2_t vsriq_n_u64 (uint64x2_t, uint64x2_t, const int)
_Form of expected instruction(s):_ 'vsri.64 Q0, Q0, #0'
* int64x2_t vsriq_n_s64 (int64x2_t, int64x2_t, const int)
_Form of expected instruction(s):_ 'vsri.64 Q0, Q0, #0'
* poly16x8_t vsriq_n_p16 (poly16x8_t, poly16x8_t, const int)
_Form of expected instruction(s):_ 'vsri.16 Q0, Q0, #0'
* poly8x16_t vsriq_n_p8 (poly8x16_t, poly8x16_t, const int)
_Form of expected instruction(s):_ 'vsri.8 Q0, Q0, #0'
5.50.3.30 Vector shift left and insert
......................................
* uint32x2_t vsli_n_u32 (uint32x2_t, uint32x2_t, const int)
_Form of expected instruction(s):_ 'vsli.32 D0, D0, #0'
* uint16x4_t vsli_n_u16 (uint16x4_t, uint16x4_t, const int)
_Form of expected instruction(s):_ 'vsli.16 D0, D0, #0'
* uint8x8_t vsli_n_u8 (uint8x8_t, uint8x8_t, const int)
_Form of expected instruction(s):_ 'vsli.8 D0, D0, #0'
* int32x2_t vsli_n_s32 (int32x2_t, int32x2_t, const int)
_Form of expected instruction(s):_ 'vsli.32 D0, D0, #0'
* int16x4_t vsli_n_s16 (int16x4_t, int16x4_t, const int)
_Form of expected instruction(s):_ 'vsli.16 D0, D0, #0'
* int8x8_t vsli_n_s8 (int8x8_t, int8x8_t, const int)
_Form of expected instruction(s):_ 'vsli.8 D0, D0, #0'
* uint64x1_t vsli_n_u64 (uint64x1_t, uint64x1_t, const int)
_Form of expected instruction(s):_ 'vsli.64 D0, D0, #0'
* int64x1_t vsli_n_s64 (int64x1_t, int64x1_t, const int)
_Form of expected instruction(s):_ 'vsli.64 D0, D0, #0'
* poly16x4_t vsli_n_p16 (poly16x4_t, poly16x4_t, const int)
_Form of expected instruction(s):_ 'vsli.16 D0, D0, #0'
* poly8x8_t vsli_n_p8 (poly8x8_t, poly8x8_t, const int)
_Form of expected instruction(s):_ 'vsli.8 D0, D0, #0'
* uint32x4_t vsliq_n_u32 (uint32x4_t, uint32x4_t, const int)
_Form of expected instruction(s):_ 'vsli.32 Q0, Q0, #0'
* uint16x8_t vsliq_n_u16 (uint16x8_t, uint16x8_t, const int)
_Form of expected instruction(s):_ 'vsli.16 Q0, Q0, #0'
* uint8x16_t vsliq_n_u8 (uint8x16_t, uint8x16_t, const int)
_Form of expected instruction(s):_ 'vsli.8 Q0, Q0, #0'
* int32x4_t vsliq_n_s32 (int32x4_t, int32x4_t, const int)
_Form of expected instruction(s):_ 'vsli.32 Q0, Q0, #0'
* int16x8_t vsliq_n_s16 (int16x8_t, int16x8_t, const int)
_Form of expected instruction(s):_ 'vsli.16 Q0, Q0, #0'
* int8x16_t vsliq_n_s8 (int8x16_t, int8x16_t, const int)
_Form of expected instruction(s):_ 'vsli.8 Q0, Q0, #0'
* uint64x2_t vsliq_n_u64 (uint64x2_t, uint64x2_t, const int)
_Form of expected instruction(s):_ 'vsli.64 Q0, Q0, #0'
* int64x2_t vsliq_n_s64 (int64x2_t, int64x2_t, const int)
_Form of expected instruction(s):_ 'vsli.64 Q0, Q0, #0'
* poly16x8_t vsliq_n_p16 (poly16x8_t, poly16x8_t, const int)
_Form of expected instruction(s):_ 'vsli.16 Q0, Q0, #0'
* poly8x16_t vsliq_n_p8 (poly8x16_t, poly8x16_t, const int)
_Form of expected instruction(s):_ 'vsli.8 Q0, Q0, #0'
5.50.3.31 Absolute value
........................
* float32x2_t vabs_f32 (float32x2_t)
_Form of expected instruction(s):_ 'vabs.f32 D0, D0'
* int32x2_t vabs_s32 (int32x2_t)
_Form of expected instruction(s):_ 'vabs.s32 D0, D0'
* int16x4_t vabs_s16 (int16x4_t)
_Form of expected instruction(s):_ 'vabs.s16 D0, D0'
* int8x8_t vabs_s8 (int8x8_t)
_Form of expected instruction(s):_ 'vabs.s8 D0, D0'
* float32x4_t vabsq_f32 (float32x4_t)
_Form of expected instruction(s):_ 'vabs.f32 Q0, Q0'
* int32x4_t vabsq_s32 (int32x4_t)
_Form of expected instruction(s):_ 'vabs.s32 Q0, Q0'
* int16x8_t vabsq_s16 (int16x8_t)
_Form of expected instruction(s):_ 'vabs.s16 Q0, Q0'
* int8x16_t vabsq_s8 (int8x16_t)
_Form of expected instruction(s):_ 'vabs.s8 Q0, Q0'
* int32x2_t vqabs_s32 (int32x2_t)
_Form of expected instruction(s):_ 'vqabs.s32 D0, D0'
* int16x4_t vqabs_s16 (int16x4_t)
_Form of expected instruction(s):_ 'vqabs.s16 D0, D0'
* int8x8_t vqabs_s8 (int8x8_t)
_Form of expected instruction(s):_ 'vqabs.s8 D0, D0'
* int32x4_t vqabsq_s32 (int32x4_t)
_Form of expected instruction(s):_ 'vqabs.s32 Q0, Q0'
* int16x8_t vqabsq_s16 (int16x8_t)
_Form of expected instruction(s):_ 'vqabs.s16 Q0, Q0'
* int8x16_t vqabsq_s8 (int8x16_t)
_Form of expected instruction(s):_ 'vqabs.s8 Q0, Q0'
5.50.3.32 Negation
..................
* float32x2_t vneg_f32 (float32x2_t)
_Form of expected instruction(s):_ 'vneg.f32 D0, D0'
* int32x2_t vneg_s32 (int32x2_t)
_Form of expected instruction(s):_ 'vneg.s32 D0, D0'
* int16x4_t vneg_s16 (int16x4_t)
_Form of expected instruction(s):_ 'vneg.s16 D0, D0'
* int8x8_t vneg_s8 (int8x8_t)
_Form of expected instruction(s):_ 'vneg.s8 D0, D0'
* float32x4_t vnegq_f32 (float32x4_t)
_Form of expected instruction(s):_ 'vneg.f32 Q0, Q0'
* int32x4_t vnegq_s32 (int32x4_t)
_Form of expected instruction(s):_ 'vneg.s32 Q0, Q0'
* int16x8_t vnegq_s16 (int16x8_t)
_Form of expected instruction(s):_ 'vneg.s16 Q0, Q0'
* int8x16_t vnegq_s8 (int8x16_t)
_Form of expected instruction(s):_ 'vneg.s8 Q0, Q0'
* int32x2_t vqneg_s32 (int32x2_t)
_Form of expected instruction(s):_ 'vqneg.s32 D0, D0'
* int16x4_t vqneg_s16 (int16x4_t)
_Form of expected instruction(s):_ 'vqneg.s16 D0, D0'
* int8x8_t vqneg_s8 (int8x8_t)
_Form of expected instruction(s):_ 'vqneg.s8 D0, D0'
* int32x4_t vqnegq_s32 (int32x4_t)
_Form of expected instruction(s):_ 'vqneg.s32 Q0, Q0'
* int16x8_t vqnegq_s16 (int16x8_t)
_Form of expected instruction(s):_ 'vqneg.s16 Q0, Q0'
* int8x16_t vqnegq_s8 (int8x16_t)
_Form of expected instruction(s):_ 'vqneg.s8 Q0, Q0'
5.50.3.33 Bitwise not
.....................
* uint32x2_t vmvn_u32 (uint32x2_t)
_Form of expected instruction(s):_ 'vmvn D0, D0'
* uint16x4_t vmvn_u16 (uint16x4_t)
_Form of expected instruction(s):_ 'vmvn D0, D0'
* uint8x8_t vmvn_u8 (uint8x8_t)
_Form of expected instruction(s):_ 'vmvn D0, D0'
* int32x2_t vmvn_s32 (int32x2_t)
_Form of expected instruction(s):_ 'vmvn D0, D0'
* int16x4_t vmvn_s16 (int16x4_t)
_Form of expected instruction(s):_ 'vmvn D0, D0'
* int8x8_t vmvn_s8 (int8x8_t)
_Form of expected instruction(s):_ 'vmvn D0, D0'
* poly8x8_t vmvn_p8 (poly8x8_t)
_Form of expected instruction(s):_ 'vmvn D0, D0'
* uint32x4_t vmvnq_u32 (uint32x4_t)
_Form of expected instruction(s):_ 'vmvn Q0, Q0'
* uint16x8_t vmvnq_u16 (uint16x8_t)
_Form of expected instruction(s):_ 'vmvn Q0, Q0'
* uint8x16_t vmvnq_u8 (uint8x16_t)
_Form of expected instruction(s):_ 'vmvn Q0, Q0'
* int32x4_t vmvnq_s32 (int32x4_t)
_Form of expected instruction(s):_ 'vmvn Q0, Q0'
* int16x8_t vmvnq_s16 (int16x8_t)
_Form of expected instruction(s):_ 'vmvn Q0, Q0'
* int8x16_t vmvnq_s8 (int8x16_t)
_Form of expected instruction(s):_ 'vmvn Q0, Q0'
* poly8x16_t vmvnq_p8 (poly8x16_t)
_Form of expected instruction(s):_ 'vmvn Q0, Q0'
5.50.3.34 Count leading sign bits
.................................
* int32x2_t vcls_s32 (int32x2_t)
_Form of expected instruction(s):_ 'vcls.s32 D0, D0'
* int16x4_t vcls_s16 (int16x4_t)
_Form of expected instruction(s):_ 'vcls.s16 D0, D0'
* int8x8_t vcls_s8 (int8x8_t)
_Form of expected instruction(s):_ 'vcls.s8 D0, D0'
* int32x4_t vclsq_s32 (int32x4_t)
_Form of expected instruction(s):_ 'vcls.s32 Q0, Q0'
* int16x8_t vclsq_s16 (int16x8_t)
_Form of expected instruction(s):_ 'vcls.s16 Q0, Q0'
* int8x16_t vclsq_s8 (int8x16_t)
_Form of expected instruction(s):_ 'vcls.s8 Q0, Q0'
5.50.3.35 Count leading zeros
.............................
* uint32x2_t vclz_u32 (uint32x2_t)
_Form of expected instruction(s):_ 'vclz.i32 D0, D0'
* uint16x4_t vclz_u16 (uint16x4_t)
_Form of expected instruction(s):_ 'vclz.i16 D0, D0'
* uint8x8_t vclz_u8 (uint8x8_t)
_Form of expected instruction(s):_ 'vclz.i8 D0, D0'
* int32x2_t vclz_s32 (int32x2_t)
_Form of expected instruction(s):_ 'vclz.i32 D0, D0'
* int16x4_t vclz_s16 (int16x4_t)
_Form of expected instruction(s):_ 'vclz.i16 D0, D0'
* int8x8_t vclz_s8 (int8x8_t)
_Form of expected instruction(s):_ 'vclz.i8 D0, D0'
* uint32x4_t vclzq_u32 (uint32x4_t)
_Form of expected instruction(s):_ 'vclz.i32 Q0, Q0'
* uint16x8_t vclzq_u16 (uint16x8_t)
_Form of expected instruction(s):_ 'vclz.i16 Q0, Q0'
* uint8x16_t vclzq_u8 (uint8x16_t)
_Form of expected instruction(s):_ 'vclz.i8 Q0, Q0'
* int32x4_t vclzq_s32 (int32x4_t)
_Form of expected instruction(s):_ 'vclz.i32 Q0, Q0'
* int16x8_t vclzq_s16 (int16x8_t)
_Form of expected instruction(s):_ 'vclz.i16 Q0, Q0'
* int8x16_t vclzq_s8 (int8x16_t)
_Form of expected instruction(s):_ 'vclz.i8 Q0, Q0'
5.50.3.36 Count number of set bits
..................................
* uint8x8_t vcnt_u8 (uint8x8_t)
_Form of expected instruction(s):_ 'vcnt.8 D0, D0'
* int8x8_t vcnt_s8 (int8x8_t)
_Form of expected instruction(s):_ 'vcnt.8 D0, D0'
* poly8x8_t vcnt_p8 (poly8x8_t)
_Form of expected instruction(s):_ 'vcnt.8 D0, D0'
* uint8x16_t vcntq_u8 (uint8x16_t)
_Form of expected instruction(s):_ 'vcnt.8 Q0, Q0'
* int8x16_t vcntq_s8 (int8x16_t)
_Form of expected instruction(s):_ 'vcnt.8 Q0, Q0'
* poly8x16_t vcntq_p8 (poly8x16_t)
_Form of expected instruction(s):_ 'vcnt.8 Q0, Q0'
5.50.3.37 Reciprocal estimate
.............................
* float32x2_t vrecpe_f32 (float32x2_t)
_Form of expected instruction(s):_ 'vrecpe.f32 D0, D0'
* uint32x2_t vrecpe_u32 (uint32x2_t)
_Form of expected instruction(s):_ 'vrecpe.u32 D0, D0'
* float32x4_t vrecpeq_f32 (float32x4_t)
_Form of expected instruction(s):_ 'vrecpe.f32 Q0, Q0'
* uint32x4_t vrecpeq_u32 (uint32x4_t)
_Form of expected instruction(s):_ 'vrecpe.u32 Q0, Q0'
5.50.3.38 Reciprocal square-root estimate
.........................................
* float32x2_t vrsqrte_f32 (float32x2_t)
_Form of expected instruction(s):_ 'vrsqrte.f32 D0, D0'
* uint32x2_t vrsqrte_u32 (uint32x2_t)
_Form of expected instruction(s):_ 'vrsqrte.u32 D0, D0'
* float32x4_t vrsqrteq_f32 (float32x4_t)
_Form of expected instruction(s):_ 'vrsqrte.f32 Q0, Q0'
* uint32x4_t vrsqrteq_u32 (uint32x4_t)
_Form of expected instruction(s):_ 'vrsqrte.u32 Q0, Q0'
5.50.3.39 Get lanes from a vector
.................................
* uint32_t vget_lane_u32 (uint32x2_t, const int)
_Form of expected instruction(s):_ 'vmov.u32 R0, D0[0]'
* uint16_t vget_lane_u16 (uint16x4_t, const int)
_Form of expected instruction(s):_ 'vmov.u16 R0, D0[0]'
* uint8_t vget_lane_u8 (uint8x8_t, const int)
_Form of expected instruction(s):_ 'vmov.u8 R0, D0[0]'
* int32_t vget_lane_s32 (int32x2_t, const int)
_Form of expected instruction(s):_ 'vmov.s32 R0, D0[0]'
* int16_t vget_lane_s16 (int16x4_t, const int)
_Form of expected instruction(s):_ 'vmov.s16 R0, D0[0]'
* int8_t vget_lane_s8 (int8x8_t, const int)
_Form of expected instruction(s):_ 'vmov.s8 R0, D0[0]'
* float32_t vget_lane_f32 (float32x2_t, const int)
_Form of expected instruction(s):_ 'vmov.f32 R0, D0[0]'
* poly16_t vget_lane_p16 (poly16x4_t, const int)
_Form of expected instruction(s):_ 'vmov.u16 R0, D0[0]'
* poly8_t vget_lane_p8 (poly8x8_t, const int)
_Form of expected instruction(s):_ 'vmov.u8 R0, D0[0]'
* uint64_t vget_lane_u64 (uint64x1_t, const int)
_Form of expected instruction(s):_ 'vmov R0, R0, D0'
* int64_t vget_lane_s64 (int64x1_t, const int)
_Form of expected instruction(s):_ 'vmov R0, R0, D0'
* uint32_t vgetq_lane_u32 (uint32x4_t, const int)
_Form of expected instruction(s):_ 'vmov.u32 R0, D0[0]'
* uint16_t vgetq_lane_u16 (uint16x8_t, const int)
_Form of expected instruction(s):_ 'vmov.u16 R0, D0[0]'
* uint8_t vgetq_lane_u8 (uint8x16_t, const int)
_Form of expected instruction(s):_ 'vmov.u8 R0, D0[0]'
* int32_t vgetq_lane_s32 (int32x4_t, const int)
_Form of expected instruction(s):_ 'vmov.s32 R0, D0[0]'
* int16_t vgetq_lane_s16 (int16x8_t, const int)
_Form of expected instruction(s):_ 'vmov.s16 R0, D0[0]'
* int8_t vgetq_lane_s8 (int8x16_t, const int)
_Form of expected instruction(s):_ 'vmov.s8 R0, D0[0]'
* float32_t vgetq_lane_f32 (float32x4_t, const int)
_Form of expected instruction(s):_ 'vmov.f32 R0, D0[0]'
* poly16_t vgetq_lane_p16 (poly16x8_t, const int)
_Form of expected instruction(s):_ 'vmov.u16 R0, D0[0]'
* poly8_t vgetq_lane_p8 (poly8x16_t, const int)
_Form of expected instruction(s):_ 'vmov.u8 R0, D0[0]'
* uint64_t vgetq_lane_u64 (uint64x2_t, const int)
_Form of expected instruction(s):_ 'vmov R0, R0, D0'
* int64_t vgetq_lane_s64 (int64x2_t, const int)
_Form of expected instruction(s):_ 'vmov R0, R0, D0'
5.50.3.40 Set lanes in a vector
...............................
* uint32x2_t vset_lane_u32 (uint32_t, uint32x2_t, const int)
_Form of expected instruction(s):_ 'vmov.32 D0[0], R0'
* uint16x4_t vset_lane_u16 (uint16_t, uint16x4_t, const int)
_Form of expected instruction(s):_ 'vmov.16 D0[0], R0'
* uint8x8_t vset_lane_u8 (uint8_t, uint8x8_t, const int)
_Form of expected instruction(s):_ 'vmov.8 D0[0], R0'
* int32x2_t vset_lane_s32 (int32_t, int32x2_t, const int)
_Form of expected instruction(s):_ 'vmov.32 D0[0], R0'
* int16x4_t vset_lane_s16 (int16_t, int16x4_t, const int)
_Form of expected instruction(s):_ 'vmov.16 D0[0], R0'
* int8x8_t vset_lane_s8 (int8_t, int8x8_t, const int)
_Form of expected instruction(s):_ 'vmov.8 D0[0], R0'
* float32x2_t vset_lane_f32 (float32_t, float32x2_t, const int)
_Form of expected instruction(s):_ 'vmov.32 D0[0], R0'
* poly16x4_t vset_lane_p16 (poly16_t, poly16x4_t, const int)
_Form of expected instruction(s):_ 'vmov.16 D0[0], R0'
* poly8x8_t vset_lane_p8 (poly8_t, poly8x8_t, const int)
_Form of expected instruction(s):_ 'vmov.8 D0[0], R0'
* uint64x1_t vset_lane_u64 (uint64_t, uint64x1_t, const int)
_Form of expected instruction(s):_ 'vmov D0, R0, R0'
* int64x1_t vset_lane_s64 (int64_t, int64x1_t, const int)
_Form of expected instruction(s):_ 'vmov D0, R0, R0'
* uint32x4_t vsetq_lane_u32 (uint32_t, uint32x4_t, const int)
_Form of expected instruction(s):_ 'vmov.32 D0[0], R0'
* uint16x8_t vsetq_lane_u16 (uint16_t, uint16x8_t, const int)
_Form of expected instruction(s):_ 'vmov.16 D0[0], R0'
* uint8x16_t vsetq_lane_u8 (uint8_t, uint8x16_t, const int)
_Form of expected instruction(s):_ 'vmov.8 D0[0], R0'
* int32x4_t vsetq_lane_s32 (int32_t, int32x4_t, const int)
_Form of expected instruction(s):_ 'vmov.32 D0[0], R0'
* int16x8_t vsetq_lane_s16 (int16_t, int16x8_t, const int)
_Form of expected instruction(s):_ 'vmov.16 D0[0], R0'
* int8x16_t vsetq_lane_s8 (int8_t, int8x16_t, const int)
_Form of expected instruction(s):_ 'vmov.8 D0[0], R0'
* float32x4_t vsetq_lane_f32 (float32_t, float32x4_t, const int)
_Form of expected instruction(s):_ 'vmov.32 D0[0], R0'
* poly16x8_t vsetq_lane_p16 (poly16_t, poly16x8_t, const int)
_Form of expected instruction(s):_ 'vmov.16 D0[0], R0'
* poly8x16_t vsetq_lane_p8 (poly8_t, poly8x16_t, const int)
_Form of expected instruction(s):_ 'vmov.8 D0[0], R0'
* uint64x2_t vsetq_lane_u64 (uint64_t, uint64x2_t, const int)
_Form of expected instruction(s):_ 'vmov D0, R0, R0'
* int64x2_t vsetq_lane_s64 (int64_t, int64x2_t, const int)
_Form of expected instruction(s):_ 'vmov D0, R0, R0'
5.50.3.41 Create vector from literal bit pattern
................................................
* uint32x2_t vcreate_u32 (uint64_t)
* uint16x4_t vcreate_u16 (uint64_t)
* uint8x8_t vcreate_u8 (uint64_t)
* int32x2_t vcreate_s32 (uint64_t)
* int16x4_t vcreate_s16 (uint64_t)
* int8x8_t vcreate_s8 (uint64_t)
* uint64x1_t vcreate_u64 (uint64_t)
* int64x1_t vcreate_s64 (uint64_t)
* float32x2_t vcreate_f32 (uint64_t)
* poly16x4_t vcreate_p16 (uint64_t)
* poly8x8_t vcreate_p8 (uint64_t)
5.50.3.42 Set all lanes to the same value
.........................................
* uint32x2_t vdup_n_u32 (uint32_t)
_Form of expected instruction(s):_ 'vdup.32 D0, R0'
* uint16x4_t vdup_n_u16 (uint16_t)
_Form of expected instruction(s):_ 'vdup.16 D0, R0'
* uint8x8_t vdup_n_u8 (uint8_t)
_Form of expected instruction(s):_ 'vdup.8 D0, R0'
* int32x2_t vdup_n_s32 (int32_t)
_Form of expected instruction(s):_ 'vdup.32 D0, R0'
* int16x4_t vdup_n_s16 (int16_t)
_Form of expected instruction(s):_ 'vdup.16 D0, R0'
* int8x8_t vdup_n_s8 (int8_t)
_Form of expected instruction(s):_ 'vdup.8 D0, R0'
* float32x2_t vdup_n_f32 (float32_t)
_Form of expected instruction(s):_ 'vdup.32 D0, R0'
* poly16x4_t vdup_n_p16 (poly16_t)
_Form of expected instruction(s):_ 'vdup.16 D0, R0'
* poly8x8_t vdup_n_p8 (poly8_t)
_Form of expected instruction(s):_ 'vdup.8 D0, R0'
* uint64x1_t vdup_n_u64 (uint64_t)
_Form of expected instruction(s):_ 'vmov D0, R0, R0'
* int64x1_t vdup_n_s64 (int64_t)
_Form of expected instruction(s):_ 'vmov D0, R0, R0'
* uint32x4_t vdupq_n_u32 (uint32_t)
_Form of expected instruction(s):_ 'vdup.32 Q0, R0'
* uint16x8_t vdupq_n_u16 (uint16_t)
_Form of expected instruction(s):_ 'vdup.16 Q0, R0'
* uint8x16_t vdupq_n_u8 (uint8_t)
_Form of expected instruction(s):_ 'vdup.8 Q0, R0'
* int32x4_t vdupq_n_s32 (int32_t)
_Form of expected instruction(s):_ 'vdup.32 Q0, R0'
* int16x8_t vdupq_n_s16 (int16_t)
_Form of expected instruction(s):_ 'vdup.16 Q0, R0'
* int8x16_t vdupq_n_s8 (int8_t)
_Form of expected instruction(s):_ 'vdup.8 Q0, R0'
* float32x4_t vdupq_n_f32 (float32_t)
_Form of expected instruction(s):_ 'vdup.32 Q0, R0'
* poly16x8_t vdupq_n_p16 (poly16_t)
_Form of expected instruction(s):_ 'vdup.16 Q0, R0'
* poly8x16_t vdupq_n_p8 (poly8_t)
_Form of expected instruction(s):_ 'vdup.8 Q0, R0'
* uint64x2_t vdupq_n_u64 (uint64_t)
_Form of expected instruction(s):_ 'vmov D0, R0, R0'
* int64x2_t vdupq_n_s64 (int64_t)
_Form of expected instruction(s):_ 'vmov D0, R0, R0'
* uint32x2_t vmov_n_u32 (uint32_t)
_Form of expected instruction(s):_ 'vdup.32 D0, R0'
* uint16x4_t vmov_n_u16 (uint16_t)
_Form of expected instruction(s):_ 'vdup.16 D0, R0'
* uint8x8_t vmov_n_u8 (uint8_t)
_Form of expected instruction(s):_ 'vdup.8 D0, R0'
* int32x2_t vmov_n_s32 (int32_t)
_Form of expected instruction(s):_ 'vdup.32 D0, R0'
* int16x4_t vmov_n_s16 (int16_t)
_Form of expected instruction(s):_ 'vdup.16 D0, R0'
* int8x8_t vmov_n_s8 (int8_t)
_Form of expected instruction(s):_ 'vdup.8 D0, R0'
* float32x2_t vmov_n_f32 (float32_t)
_Form of expected instruction(s):_ 'vdup.32 D0, R0'
* poly16x4_t vmov_n_p16 (poly16_t)
_Form of expected instruction(s):_ 'vdup.16 D0, R0'
* poly8x8_t vmov_n_p8 (poly8_t)
_Form of expected instruction(s):_ 'vdup.8 D0, R0'
* uint64x1_t vmov_n_u64 (uint64_t)
_Form of expected instruction(s):_ 'vmov D0, R0, R0'
* int64x1_t vmov_n_s64 (int64_t)
_Form of expected instruction(s):_ 'vmov D0, R0, R0'
* uint32x4_t vmovq_n_u32 (uint32_t)
_Form of expected instruction(s):_ 'vdup.32 Q0, R0'
* uint16x8_t vmovq_n_u16 (uint16_t)
_Form of expected instruction(s):_ 'vdup.16 Q0, R0'
* uint8x16_t vmovq_n_u8 (uint8_t)
_Form of expected instruction(s):_ 'vdup.8 Q0, R0'
* int32x4_t vmovq_n_s32 (int32_t)
_Form of expected instruction(s):_ 'vdup.32 Q0, R0'
* int16x8_t vmovq_n_s16 (int16_t)
_Form of expected instruction(s):_ 'vdup.16 Q0, R0'
* int8x16_t vmovq_n_s8 (int8_t)
_Form of expected instruction(s):_ 'vdup.8 Q0, R0'
* float32x4_t vmovq_n_f32 (float32_t)
_Form of expected instruction(s):_ 'vdup.32 Q0, R0'
* poly16x8_t vmovq_n_p16 (poly16_t)
_Form of expected instruction(s):_ 'vdup.16 Q0, R0'
* poly8x16_t vmovq_n_p8 (poly8_t)
_Form of expected instruction(s):_ 'vdup.8 Q0, R0'
* uint64x2_t vmovq_n_u64 (uint64_t)
_Form of expected instruction(s):_ 'vmov D0, R0, R0'
* int64x2_t vmovq_n_s64 (int64_t)
_Form of expected instruction(s):_ 'vmov D0, R0, R0'
* uint32x2_t vdup_lane_u32 (uint32x2_t, const int)
_Form of expected instruction(s):_ 'vdup.32 D0, D0[0]'
* uint16x4_t vdup_lane_u16 (uint16x4_t, const int)
_Form of expected instruction(s):_ 'vdup.16 D0, D0[0]'
* uint8x8_t vdup_lane_u8 (uint8x8_t, const int)
_Form of expected instruction(s):_ 'vdup.8 D0, D0[0]'
* int32x2_t vdup_lane_s32 (int32x2_t, const int)
_Form of expected instruction(s):_ 'vdup.32 D0, D0[0]'
* int16x4_t vdup_lane_s16 (int16x4_t, const int)
_Form of expected instruction(s):_ 'vdup.16 D0, D0[0]'
* int8x8_t vdup_lane_s8 (int8x8_t, const int)
_Form of expected instruction(s):_ 'vdup.8 D0, D0[0]'
* float32x2_t vdup_lane_f32 (float32x2_t, const int)
_Form of expected instruction(s):_ 'vdup.32 D0, D0[0]'
* poly16x4_t vdup_lane_p16 (poly16x4_t, const int)
_Form of expected instruction(s):_ 'vdup.16 D0, D0[0]'
* poly8x8_t vdup_lane_p8 (poly8x8_t, const int)
_Form of expected instruction(s):_ 'vdup.8 D0, D0[0]'
* uint64x1_t vdup_lane_u64 (uint64x1_t, const int)
* int64x1_t vdup_lane_s64 (int64x1_t, const int)
* uint32x4_t vdupq_lane_u32 (uint32x2_t, const int)
_Form of expected instruction(s):_ 'vdup.32 Q0, D0[0]'
* uint16x8_t vdupq_lane_u16 (uint16x4_t, const int)
_Form of expected instruction(s):_ 'vdup.16 Q0, D0[0]'
* uint8x16_t vdupq_lane_u8 (uint8x8_t, const int)
_Form of expected instruction(s):_ 'vdup.8 Q0, D0[0]'
* int32x4_t vdupq_lane_s32 (int32x2_t, const int)
_Form of expected instruction(s):_ 'vdup.32 Q0, D0[0]'
* int16x8_t vdupq_lane_s16 (int16x4_t, const int)
_Form of expected instruction(s):_ 'vdup.16 Q0, D0[0]'
* int8x16_t vdupq_lane_s8 (int8x8_t, const int)
_Form of expected instruction(s):_ 'vdup.8 Q0, D0[0]'
* float32x4_t vdupq_lane_f32 (float32x2_t, const int)
_Form of expected instruction(s):_ 'vdup.32 Q0, D0[0]'
* poly16x8_t vdupq_lane_p16 (poly16x4_t, const int)
_Form of expected instruction(s):_ 'vdup.16 Q0, D0[0]'
* poly8x16_t vdupq_lane_p8 (poly8x8_t, const int)
_Form of expected instruction(s):_ 'vdup.8 Q0, D0[0]'
* uint64x2_t vdupq_lane_u64 (uint64x1_t, const int)
* int64x2_t vdupq_lane_s64 (int64x1_t, const int)
5.50.3.43 Combining vectors
...........................
* uint32x4_t vcombine_u32 (uint32x2_t, uint32x2_t)
* uint16x8_t vcombine_u16 (uint16x4_t, uint16x4_t)
* uint8x16_t vcombine_u8 (uint8x8_t, uint8x8_t)
* int32x4_t vcombine_s32 (int32x2_t, int32x2_t)
* int16x8_t vcombine_s16 (int16x4_t, int16x4_t)
* int8x16_t vcombine_s8 (int8x8_t, int8x8_t)
* uint64x2_t vcombine_u64 (uint64x1_t, uint64x1_t)
* int64x2_t vcombine_s64 (int64x1_t, int64x1_t)
* float32x4_t vcombine_f32 (float32x2_t, float32x2_t)
* poly16x8_t vcombine_p16 (poly16x4_t, poly16x4_t)
* poly8x16_t vcombine_p8 (poly8x8_t, poly8x8_t)
5.50.3.44 Splitting vectors
...........................
* uint32x2_t vget_high_u32 (uint32x4_t)
* uint16x4_t vget_high_u16 (uint16x8_t)
* uint8x8_t vget_high_u8 (uint8x16_t)
* int32x2_t vget_high_s32 (int32x4_t)
* int16x4_t vget_high_s16 (int16x8_t)
* int8x8_t vget_high_s8 (int8x16_t)
* uint64x1_t vget_high_u64 (uint64x2_t)
* int64x1_t vget_high_s64 (int64x2_t)
* float32x2_t vget_high_f32 (float32x4_t)
* poly16x4_t vget_high_p16 (poly16x8_t)
* poly8x8_t vget_high_p8 (poly8x16_t)
* uint32x2_t vget_low_u32 (uint32x4_t)
_Form of expected instruction(s):_ 'vmov D0, D0'
* uint16x4_t vget_low_u16 (uint16x8_t)
_Form of expected instruction(s):_ 'vmov D0, D0'
* uint8x8_t vget_low_u8 (uint8x16_t)
_Form of expected instruction(s):_ 'vmov D0, D0'
* int32x2_t vget_low_s32 (int32x4_t)
_Form of expected instruction(s):_ 'vmov D0, D0'
* int16x4_t vget_low_s16 (int16x8_t)
_Form of expected instruction(s):_ 'vmov D0, D0'
* int8x8_t vget_low_s8 (int8x16_t)
_Form of expected instruction(s):_ 'vmov D0, D0'
* uint64x1_t vget_low_u64 (uint64x2_t)
_Form of expected instruction(s):_ 'vmov D0, D0'
* int64x1_t vget_low_s64 (int64x2_t)
_Form of expected instruction(s):_ 'vmov D0, D0'
* float32x2_t vget_low_f32 (float32x4_t)
_Form of expected instruction(s):_ 'vmov D0, D0'
* poly16x4_t vget_low_p16 (poly16x8_t)
_Form of expected instruction(s):_ 'vmov D0, D0'
* poly8x8_t vget_low_p8 (poly8x16_t)
_Form of expected instruction(s):_ 'vmov D0, D0'
5.50.3.45 Conversions
.....................
* float32x2_t vcvt_f32_u32 (uint32x2_t)
_Form of expected instruction(s):_ 'vcvt.f32.u32 D0, D0'
* float32x2_t vcvt_f32_s32 (int32x2_t)
_Form of expected instruction(s):_ 'vcvt.f32.s32 D0, D0'
* uint32x2_t vcvt_u32_f32 (float32x2_t)
_Form of expected instruction(s):_ 'vcvt.u32.f32 D0, D0'
* int32x2_t vcvt_s32_f32 (float32x2_t)
_Form of expected instruction(s):_ 'vcvt.s32.f32 D0, D0'
* float32x4_t vcvtq_f32_u32 (uint32x4_t)
_Form of expected instruction(s):_ 'vcvt.f32.u32 Q0, Q0'
* float32x4_t vcvtq_f32_s32 (int32x4_t)
_Form of expected instruction(s):_ 'vcvt.f32.s32 Q0, Q0'
* uint32x4_t vcvtq_u32_f32 (float32x4_t)
_Form of expected instruction(s):_ 'vcvt.u32.f32 Q0, Q0'
* int32x4_t vcvtq_s32_f32 (float32x4_t)
_Form of expected instruction(s):_ 'vcvt.s32.f32 Q0, Q0'
* float32x2_t vcvt_n_f32_u32 (uint32x2_t, const int)
_Form of expected instruction(s):_ 'vcvt.f32.u32 D0, D0, #0'
* float32x2_t vcvt_n_f32_s32 (int32x2_t, const int)
_Form of expected instruction(s):_ 'vcvt.f32.s32 D0, D0, #0'
* uint32x2_t vcvt_n_u32_f32 (float32x2_t, const int)
_Form of expected instruction(s):_ 'vcvt.u32.f32 D0, D0, #0'
* int32x2_t vcvt_n_s32_f32 (float32x2_t, const int)
_Form of expected instruction(s):_ 'vcvt.s32.f32 D0, D0, #0'
* float32x4_t vcvtq_n_f32_u32 (uint32x4_t, const int)
_Form of expected instruction(s):_ 'vcvt.f32.u32 Q0, Q0, #0'
* float32x4_t vcvtq_n_f32_s32 (int32x4_t, const int)
_Form of expected instruction(s):_ 'vcvt.f32.s32 Q0, Q0, #0'
* uint32x4_t vcvtq_n_u32_f32 (float32x4_t, const int)
_Form of expected instruction(s):_ 'vcvt.u32.f32 Q0, Q0, #0'
* int32x4_t vcvtq_n_s32_f32 (float32x4_t, const int)
_Form of expected instruction(s):_ 'vcvt.s32.f32 Q0, Q0, #0'
5.50.3.46 Move, single_opcode narrowing
.......................................
* uint32x2_t vmovn_u64 (uint64x2_t)
_Form of expected instruction(s):_ 'vmovn.i64 D0, Q0'
* uint16x4_t vmovn_u32 (uint32x4_t)
_Form of expected instruction(s):_ 'vmovn.i32 D0, Q0'
* uint8x8_t vmovn_u16 (uint16x8_t)
_Form of expected instruction(s):_ 'vmovn.i16 D0, Q0'
* int32x2_t vmovn_s64 (int64x2_t)
_Form of expected instruction(s):_ 'vmovn.i64 D0, Q0'
* int16x4_t vmovn_s32 (int32x4_t)
_Form of expected instruction(s):_ 'vmovn.i32 D0, Q0'
* int8x8_t vmovn_s16 (int16x8_t)
_Form of expected instruction(s):_ 'vmovn.i16 D0, Q0'
* uint32x2_t vqmovn_u64 (uint64x2_t)
_Form of expected instruction(s):_ 'vqmovn.u64 D0, Q0'
* uint16x4_t vqmovn_u32 (uint32x4_t)
_Form of expected instruction(s):_ 'vqmovn.u32 D0, Q0'
* uint8x8_t vqmovn_u16 (uint16x8_t)
_Form of expected instruction(s):_ 'vqmovn.u16 D0, Q0'
* int32x2_t vqmovn_s64 (int64x2_t)
_Form of expected instruction(s):_ 'vqmovn.s64 D0, Q0'
* int16x4_t vqmovn_s32 (int32x4_t)
_Form of expected instruction(s):_ 'vqmovn.s32 D0, Q0'
* int8x8_t vqmovn_s16 (int16x8_t)
_Form of expected instruction(s):_ 'vqmovn.s16 D0, Q0'
* uint32x2_t vqmovun_s64 (int64x2_t)
_Form of expected instruction(s):_ 'vqmovun.s64 D0, Q0'
* uint16x4_t vqmovun_s32 (int32x4_t)
_Form of expected instruction(s):_ 'vqmovun.s32 D0, Q0'
* uint8x8_t vqmovun_s16 (int16x8_t)
_Form of expected instruction(s):_ 'vqmovun.s16 D0, Q0'
5.50.3.47 Move, single_opcode long
..................................
* uint64x2_t vmovl_u32 (uint32x2_t)
_Form of expected instruction(s):_ 'vmovl.u32 Q0, D0'
* uint32x4_t vmovl_u16 (uint16x4_t)
_Form of expected instruction(s):_ 'vmovl.u16 Q0, D0'
* uint16x8_t vmovl_u8 (uint8x8_t)
_Form of expected instruction(s):_ 'vmovl.u8 Q0, D0'
* int64x2_t vmovl_s32 (int32x2_t)
_Form of expected instruction(s):_ 'vmovl.s32 Q0, D0'
* int32x4_t vmovl_s16 (int16x4_t)
_Form of expected instruction(s):_ 'vmovl.s16 Q0, D0'
* int16x8_t vmovl_s8 (int8x8_t)
_Form of expected instruction(s):_ 'vmovl.s8 Q0, D0'
5.50.3.48 Table lookup
......................
* poly8x8_t vtbl1_p8 (poly8x8_t, uint8x8_t)
_Form of expected instruction(s):_ 'vtbl.8 D0, {D0}, D0'
* int8x8_t vtbl1_s8 (int8x8_t, int8x8_t)
_Form of expected instruction(s):_ 'vtbl.8 D0, {D0}, D0'
* uint8x8_t vtbl1_u8 (uint8x8_t, uint8x8_t)
_Form of expected instruction(s):_ 'vtbl.8 D0, {D0}, D0'
* poly8x8_t vtbl2_p8 (poly8x8x2_t, uint8x8_t)
_Form of expected instruction(s):_ 'vtbl.8 D0, {D0, D1}, D0'
* int8x8_t vtbl2_s8 (int8x8x2_t, int8x8_t)
_Form of expected instruction(s):_ 'vtbl.8 D0, {D0, D1}, D0'
* uint8x8_t vtbl2_u8 (uint8x8x2_t, uint8x8_t)
_Form of expected instruction(s):_ 'vtbl.8 D0, {D0, D1}, D0'
* poly8x8_t vtbl3_p8 (poly8x8x3_t, uint8x8_t)
_Form of expected instruction(s):_ 'vtbl.8 D0, {D0, D1, D2}, D0'
* int8x8_t vtbl3_s8 (int8x8x3_t, int8x8_t)
_Form of expected instruction(s):_ 'vtbl.8 D0, {D0, D1, D2}, D0'
* uint8x8_t vtbl3_u8 (uint8x8x3_t, uint8x8_t)
_Form of expected instruction(s):_ 'vtbl.8 D0, {D0, D1, D2}, D0'
* poly8x8_t vtbl4_p8 (poly8x8x4_t, uint8x8_t)
_Form of expected instruction(s):_ 'vtbl.8 D0, {D0, D1, D2, D3},
D0'
* int8x8_t vtbl4_s8 (int8x8x4_t, int8x8_t)
_Form of expected instruction(s):_ 'vtbl.8 D0, {D0, D1, D2, D3},
D0'
* uint8x8_t vtbl4_u8 (uint8x8x4_t, uint8x8_t)
_Form of expected instruction(s):_ 'vtbl.8 D0, {D0, D1, D2, D3},
D0'
5.50.3.49 Extended table lookup
...............................
* poly8x8_t vtbx1_p8 (poly8x8_t, poly8x8_t, uint8x8_t)
_Form of expected instruction(s):_ 'vtbx.8 D0, {D0}, D0'
* int8x8_t vtbx1_s8 (int8x8_t, int8x8_t, int8x8_t)
_Form of expected instruction(s):_ 'vtbx.8 D0, {D0}, D0'
* uint8x8_t vtbx1_u8 (uint8x8_t, uint8x8_t, uint8x8_t)
_Form of expected instruction(s):_ 'vtbx.8 D0, {D0}, D0'
* poly8x8_t vtbx2_p8 (poly8x8_t, poly8x8x2_t, uint8x8_t)
_Form of expected instruction(s):_ 'vtbx.8 D0, {D0, D1}, D0'
* int8x8_t vtbx2_s8 (int8x8_t, int8x8x2_t, int8x8_t)
_Form of expected instruction(s):_ 'vtbx.8 D0, {D0, D1}, D0'
* uint8x8_t vtbx2_u8 (uint8x8_t, uint8x8x2_t, uint8x8_t)
_Form of expected instruction(s):_ 'vtbx.8 D0, {D0, D1}, D0'
* poly8x8_t vtbx3_p8 (poly8x8_t, poly8x8x3_t, uint8x8_t)
_Form of expected instruction(s):_ 'vtbx.8 D0, {D0, D1, D2}, D0'
* int8x8_t vtbx3_s8 (int8x8_t, int8x8x3_t, int8x8_t)
_Form of expected instruction(s):_ 'vtbx.8 D0, {D0, D1, D2}, D0'
* uint8x8_t vtbx3_u8 (uint8x8_t, uint8x8x3_t, uint8x8_t)
_Form of expected instruction(s):_ 'vtbx.8 D0, {D0, D1, D2}, D0'
* poly8x8_t vtbx4_p8 (poly8x8_t, poly8x8x4_t, uint8x8_t)
_Form of expected instruction(s):_ 'vtbx.8 D0, {D0, D1, D2, D3},
D0'
* int8x8_t vtbx4_s8 (int8x8_t, int8x8x4_t, int8x8_t)
_Form of expected instruction(s):_ 'vtbx.8 D0, {D0, D1, D2, D3},
D0'
* uint8x8_t vtbx4_u8 (uint8x8_t, uint8x8x4_t, uint8x8_t)
_Form of expected instruction(s):_ 'vtbx.8 D0, {D0, D1, D2, D3},
D0'
5.50.3.50 Multiply, lane
........................
* float32x2_t vmul_lane_f32 (float32x2_t, float32x2_t, const int)
_Form of expected instruction(s):_ 'vmul.f32 D0, D0, D0[0]'
* uint32x2_t vmul_lane_u32 (uint32x2_t, uint32x2_t, const int)
_Form of expected instruction(s):_ 'vmul.i32 D0, D0, D0[0]'
* uint16x4_t vmul_lane_u16 (uint16x4_t, uint16x4_t, const int)
_Form of expected instruction(s):_ 'vmul.i16 D0, D0, D0[0]'
* int32x2_t vmul_lane_s32 (int32x2_t, int32x2_t, const int)
_Form of expected instruction(s):_ 'vmul.i32 D0, D0, D0[0]'
* int16x4_t vmul_lane_s16 (int16x4_t, int16x4_t, const int)
_Form of expected instruction(s):_ 'vmul.i16 D0, D0, D0[0]'
* float32x4_t vmulq_lane_f32 (float32x4_t, float32x2_t, const int)
_Form of expected instruction(s):_ 'vmul.f32 Q0, Q0, D0[0]'
* uint32x4_t vmulq_lane_u32 (uint32x4_t, uint32x2_t, const int)
_Form of expected instruction(s):_ 'vmul.i32 Q0, Q0, D0[0]'
* uint16x8_t vmulq_lane_u16 (uint16x8_t, uint16x4_t, const int)
_Form of expected instruction(s):_ 'vmul.i16 Q0, Q0, D0[0]'
* int32x4_t vmulq_lane_s32 (int32x4_t, int32x2_t, const int)
_Form of expected instruction(s):_ 'vmul.i32 Q0, Q0, D0[0]'
* int16x8_t vmulq_lane_s16 (int16x8_t, int16x4_t, const int)
_Form of expected instruction(s):_ 'vmul.i16 Q0, Q0, D0[0]'
5.50.3.51 Long multiply, lane
.............................
* uint64x2_t vmull_lane_u32 (uint32x2_t, uint32x2_t, const int)
_Form of expected instruction(s):_ 'vmull.u32 Q0, D0, D0[0]'
* uint32x4_t vmull_lane_u16 (uint16x4_t, uint16x4_t, const int)
_Form of expected instruction(s):_ 'vmull.u16 Q0, D0, D0[0]'
* int64x2_t vmull_lane_s32 (int32x2_t, int32x2_t, const int)
_Form of expected instruction(s):_ 'vmull.s32 Q0, D0, D0[0]'
* int32x4_t vmull_lane_s16 (int16x4_t, int16x4_t, const int)
_Form of expected instruction(s):_ 'vmull.s16 Q0, D0, D0[0]'
5.50.3.52 Saturating doubling long multiply, lane
.................................................
* int64x2_t vqdmull_lane_s32 (int32x2_t, int32x2_t, const int)
_Form of expected instruction(s):_ 'vqdmull.s32 Q0, D0, D0[0]'
* int32x4_t vqdmull_lane_s16 (int16x4_t, int16x4_t, const int)
_Form of expected instruction(s):_ 'vqdmull.s16 Q0, D0, D0[0]'
5.50.3.53 Saturating doubling multiply high, lane
.................................................
* int32x4_t vqdmulhq_lane_s32 (int32x4_t, int32x2_t, const int)
_Form of expected instruction(s):_ 'vqdmulh.s32 Q0, Q0, D0[0]'
* int16x8_t vqdmulhq_lane_s16 (int16x8_t, int16x4_t, const int)
_Form of expected instruction(s):_ 'vqdmulh.s16 Q0, Q0, D0[0]'
* int32x2_t vqdmulh_lane_s32 (int32x2_t, int32x2_t, const int)
_Form of expected instruction(s):_ 'vqdmulh.s32 D0, D0, D0[0]'
* int16x4_t vqdmulh_lane_s16 (int16x4_t, int16x4_t, const int)
_Form of expected instruction(s):_ 'vqdmulh.s16 D0, D0, D0[0]'
* int32x4_t vqrdmulhq_lane_s32 (int32x4_t, int32x2_t, const int)
_Form of expected instruction(s):_ 'vqrdmulh.s32 Q0, Q0, D0[0]'
* int16x8_t vqrdmulhq_lane_s16 (int16x8_t, int16x4_t, const int)
_Form of expected instruction(s):_ 'vqrdmulh.s16 Q0, Q0, D0[0]'
* int32x2_t vqrdmulh_lane_s32 (int32x2_t, int32x2_t, const int)
_Form of expected instruction(s):_ 'vqrdmulh.s32 D0, D0, D0[0]'
* int16x4_t vqrdmulh_lane_s16 (int16x4_t, int16x4_t, const int)
_Form of expected instruction(s):_ 'vqrdmulh.s16 D0, D0, D0[0]'
5.50.3.54 Multiply-accumulate, lane
...................................
* float32x2_t vmla_lane_f32 (float32x2_t, float32x2_t, float32x2_t,
const int)
_Form of expected instruction(s):_ 'vmla.f32 D0, D0, D0[0]'
* uint32x2_t vmla_lane_u32 (uint32x2_t, uint32x2_t, uint32x2_t, const
int)
_Form of expected instruction(s):_ 'vmla.i32 D0, D0, D0[0]'
* uint16x4_t vmla_lane_u16 (uint16x4_t, uint16x4_t, uint16x4_t, const
int)
_Form of expected instruction(s):_ 'vmla.i16 D0, D0, D0[0]'
* int32x2_t vmla_lane_s32 (int32x2_t, int32x2_t, int32x2_t, const
int)
_Form of expected instruction(s):_ 'vmla.i32 D0, D0, D0[0]'
* int16x4_t vmla_lane_s16 (int16x4_t, int16x4_t, int16x4_t, const
int)
_Form of expected instruction(s):_ 'vmla.i16 D0, D0, D0[0]'
* float32x4_t vmlaq_lane_f32 (float32x4_t, float32x4_t, float32x2_t,
const int)
_Form of expected instruction(s):_ 'vmla.f32 Q0, Q0, D0[0]'
* uint32x4_t vmlaq_lane_u32 (uint32x4_t, uint32x4_t, uint32x2_t,
const int)
_Form of expected instruction(s):_ 'vmla.i32 Q0, Q0, D0[0]'
* uint16x8_t vmlaq_lane_u16 (uint16x8_t, uint16x8_t, uint16x4_t,
const int)
_Form of expected instruction(s):_ 'vmla.i16 Q0, Q0, D0[0]'
* int32x4_t vmlaq_lane_s32 (int32x4_t, int32x4_t, int32x2_t, const
int)
_Form of expected instruction(s):_ 'vmla.i32 Q0, Q0, D0[0]'
* int16x8_t vmlaq_lane_s16 (int16x8_t, int16x8_t, int16x4_t, const
int)
_Form of expected instruction(s):_ 'vmla.i16 Q0, Q0, D0[0]'
* uint64x2_t vmlal_lane_u32 (uint64x2_t, uint32x2_t, uint32x2_t,
const int)
_Form of expected instruction(s):_ 'vmlal.u32 Q0, D0, D0[0]'
* uint32x4_t vmlal_lane_u16 (uint32x4_t, uint16x4_t, uint16x4_t,
const int)
_Form of expected instruction(s):_ 'vmlal.u16 Q0, D0, D0[0]'
* int64x2_t vmlal_lane_s32 (int64x2_t, int32x2_t, int32x2_t, const
int)
_Form of expected instruction(s):_ 'vmlal.s32 Q0, D0, D0[0]'
* int32x4_t vmlal_lane_s16 (int32x4_t, int16x4_t, int16x4_t, const
int)
_Form of expected instruction(s):_ 'vmlal.s16 Q0, D0, D0[0]'
* int64x2_t vqdmlal_lane_s32 (int64x2_t, int32x2_t, int32x2_t, const
int)
_Form of expected instruction(s):_ 'vqdmlal.s32 Q0, D0, D0[0]'
* int32x4_t vqdmlal_lane_s16 (int32x4_t, int16x4_t, int16x4_t, const
int)
_Form of expected instruction(s):_ 'vqdmlal.s16 Q0, D0, D0[0]'
5.50.3.55 Multiply-subtract, lane
.................................
* float32x2_t vmls_lane_f32 (float32x2_t, float32x2_t, float32x2_t,
const int)
_Form of expected instruction(s):_ 'vmls.f32 D0, D0, D0[0]'
* uint32x2_t vmls_lane_u32 (uint32x2_t, uint32x2_t, uint32x2_t, const
int)
_Form of expected instruction(s):_ 'vmls.i32 D0, D0, D0[0]'
* uint16x4_t vmls_lane_u16 (uint16x4_t, uint16x4_t, uint16x4_t, const
int)
_Form of expected instruction(s):_ 'vmls.i16 D0, D0, D0[0]'
* int32x2_t vmls_lane_s32 (int32x2_t, int32x2_t, int32x2_t, const
int)
_Form of expected instruction(s):_ 'vmls.i32 D0, D0, D0[0]'
* int16x4_t vmls_lane_s16 (int16x4_t, int16x4_t, int16x4_t, const
int)
_Form of expected instruction(s):_ 'vmls.i16 D0, D0, D0[0]'
* float32x4_t vmlsq_lane_f32 (float32x4_t, float32x4_t, float32x2_t,
const int)
_Form of expected instruction(s):_ 'vmls.f32 Q0, Q0, D0[0]'
* uint32x4_t vmlsq_lane_u32 (uint32x4_t, uint32x4_t, uint32x2_t,
const int)
_Form of expected instruction(s):_ 'vmls.i32 Q0, Q0, D0[0]'
* uint16x8_t vmlsq_lane_u16 (uint16x8_t, uint16x8_t, uint16x4_t,
const int)
_Form of expected instruction(s):_ 'vmls.i16 Q0, Q0, D0[0]'
* int32x4_t vmlsq_lane_s32 (int32x4_t, int32x4_t, int32x2_t, const
int)
_Form of expected instruction(s):_ 'vmls.i32 Q0, Q0, D0[0]'
* int16x8_t vmlsq_lane_s16 (int16x8_t, int16x8_t, int16x4_t, const
int)
_Form of expected instruction(s):_ 'vmls.i16 Q0, Q0, D0[0]'
* uint64x2_t vmlsl_lane_u32 (uint64x2_t, uint32x2_t, uint32x2_t,
const int)
_Form of expected instruction(s):_ 'vmlsl.u32 Q0, D0, D0[0]'
* uint32x4_t vmlsl_lane_u16 (uint32x4_t, uint16x4_t, uint16x4_t,
const int)
_Form of expected instruction(s):_ 'vmlsl.u16 Q0, D0, D0[0]'
* int64x2_t vmlsl_lane_s32 (int64x2_t, int32x2_t, int32x2_t, const
int)
_Form of expected instruction(s):_ 'vmlsl.s32 Q0, D0, D0[0]'
* int32x4_t vmlsl_lane_s16 (int32x4_t, int16x4_t, int16x4_t, const
int)
_Form of expected instruction(s):_ 'vmlsl.s16 Q0, D0, D0[0]'
* int64x2_t vqdmlsl_lane_s32 (int64x2_t, int32x2_t, int32x2_t, const
int)
_Form of expected instruction(s):_ 'vqdmlsl.s32 Q0, D0, D0[0]'
* int32x4_t vqdmlsl_lane_s16 (int32x4_t, int16x4_t, int16x4_t, const
int)
_Form of expected instruction(s):_ 'vqdmlsl.s16 Q0, D0, D0[0]'
5.50.3.56 Vector multiply by scalar
...................................
* float32x2_t vmul_n_f32 (float32x2_t, float32_t)
_Form of expected instruction(s):_ 'vmul.f32 D0, D0, D0[0]'
* uint32x2_t vmul_n_u32 (uint32x2_t, uint32_t)
_Form of expected instruction(s):_ 'vmul.i32 D0, D0, D0[0]'
* uint16x4_t vmul_n_u16 (uint16x4_t, uint16_t)
_Form of expected instruction(s):_ 'vmul.i16 D0, D0, D0[0]'
* int32x2_t vmul_n_s32 (int32x2_t, int32_t)
_Form of expected instruction(s):_ 'vmul.i32 D0, D0, D0[0]'
* int16x4_t vmul_n_s16 (int16x4_t, int16_t)
_Form of expected instruction(s):_ 'vmul.i16 D0, D0, D0[0]'
* float32x4_t vmulq_n_f32 (float32x4_t, float32_t)
_Form of expected instruction(s):_ 'vmul.f32 Q0, Q0, D0[0]'
* uint32x4_t vmulq_n_u32 (uint32x4_t, uint32_t)
_Form of expected instruction(s):_ 'vmul.i32 Q0, Q0, D0[0]'
* uint16x8_t vmulq_n_u16 (uint16x8_t, uint16_t)
_Form of expected instruction(s):_ 'vmul.i16 Q0, Q0, D0[0]'
* int32x4_t vmulq_n_s32 (int32x4_t, int32_t)
_Form of expected instruction(s):_ 'vmul.i32 Q0, Q0, D0[0]'
* int16x8_t vmulq_n_s16 (int16x8_t, int16_t)
_Form of expected instruction(s):_ 'vmul.i16 Q0, Q0, D0[0]'
5.50.3.57 Vector long multiply by scalar
........................................
* uint64x2_t vmull_n_u32 (uint32x2_t, uint32_t)
_Form of expected instruction(s):_ 'vmull.u32 Q0, D0, D0[0]'
* uint32x4_t vmull_n_u16 (uint16x4_t, uint16_t)
_Form of expected instruction(s):_ 'vmull.u16 Q0, D0, D0[0]'
* int64x2_t vmull_n_s32 (int32x2_t, int32_t)
_Form of expected instruction(s):_ 'vmull.s32 Q0, D0, D0[0]'
* int32x4_t vmull_n_s16 (int16x4_t, int16_t)
_Form of expected instruction(s):_ 'vmull.s16 Q0, D0, D0[0]'
5.50.3.58 Vector saturating doubling long multiply by scalar
............................................................
* int64x2_t vqdmull_n_s32 (int32x2_t, int32_t)
_Form of expected instruction(s):_ 'vqdmull.s32 Q0, D0, D0[0]'
* int32x4_t vqdmull_n_s16 (int16x4_t, int16_t)
_Form of expected instruction(s):_ 'vqdmull.s16 Q0, D0, D0[0]'
5.50.3.59 Vector saturating doubling multiply high by scalar
............................................................
* int32x4_t vqdmulhq_n_s32 (int32x4_t, int32_t)
_Form of expected instruction(s):_ 'vqdmulh.s32 Q0, Q0, D0[0]'
* int16x8_t vqdmulhq_n_s16 (int16x8_t, int16_t)
_Form of expected instruction(s):_ 'vqdmulh.s16 Q0, Q0, D0[0]'
* int32x2_t vqdmulh_n_s32 (int32x2_t, int32_t)
_Form of expected instruction(s):_ 'vqdmulh.s32 D0, D0, D0[0]'
* int16x4_t vqdmulh_n_s16 (int16x4_t, int16_t)
_Form of expected instruction(s):_ 'vqdmulh.s16 D0, D0, D0[0]'
* int32x4_t vqrdmulhq_n_s32 (int32x4_t, int32_t)
_Form of expected instruction(s):_ 'vqrdmulh.s32 Q0, Q0, D0[0]'
* int16x8_t vqrdmulhq_n_s16 (int16x8_t, int16_t)
_Form of expected instruction(s):_ 'vqrdmulh.s16 Q0, Q0, D0[0]'
* int32x2_t vqrdmulh_n_s32 (int32x2_t, int32_t)
_Form of expected instruction(s):_ 'vqrdmulh.s32 D0, D0, D0[0]'
* int16x4_t vqrdmulh_n_s16 (int16x4_t, int16_t)
_Form of expected instruction(s):_ 'vqrdmulh.s16 D0, D0, D0[0]'
5.50.3.60 Vector multiply-accumulate by scalar
..............................................
* float32x2_t vmla_n_f32 (float32x2_t, float32x2_t, float32_t)
_Form of expected instruction(s):_ 'vmla.f32 D0, D0, D0[0]'
* uint32x2_t vmla_n_u32 (uint32x2_t, uint32x2_t, uint32_t)
_Form of expected instruction(s):_ 'vmla.i32 D0, D0, D0[0]'
* uint16x4_t vmla_n_u16 (uint16x4_t, uint16x4_t, uint16_t)
_Form of expected instruction(s):_ 'vmla.i16 D0, D0, D0[0]'
* int32x2_t vmla_n_s32 (int32x2_t, int32x2_t, int32_t)
_Form of expected instruction(s):_ 'vmla.i32 D0, D0, D0[0]'
* int16x4_t vmla_n_s16 (int16x4_t, int16x4_t, int16_t)
_Form of expected instruction(s):_ 'vmla.i16 D0, D0, D0[0]'
* float32x4_t vmlaq_n_f32 (float32x4_t, float32x4_t, float32_t)
_Form of expected instruction(s):_ 'vmla.f32 Q0, Q0, D0[0]'
* uint32x4_t vmlaq_n_u32 (uint32x4_t, uint32x4_t, uint32_t)
_Form of expected instruction(s):_ 'vmla.i32 Q0, Q0, D0[0]'
* uint16x8_t vmlaq_n_u16 (uint16x8_t, uint16x8_t, uint16_t)
_Form of expected instruction(s):_ 'vmla.i16 Q0, Q0, D0[0]'
* int32x4_t vmlaq_n_s32 (int32x4_t, int32x4_t, int32_t)
_Form of expected instruction(s):_ 'vmla.i32 Q0, Q0, D0[0]'
* int16x8_t vmlaq_n_s16 (int16x8_t, int16x8_t, int16_t)
_Form of expected instruction(s):_ 'vmla.i16 Q0, Q0, D0[0]'
* uint64x2_t vmlal_n_u32 (uint64x2_t, uint32x2_t, uint32_t)
_Form of expected instruction(s):_ 'vmlal.u32 Q0, D0, D0[0]'
* uint32x4_t vmlal_n_u16 (uint32x4_t, uint16x4_t, uint16_t)
_Form of expected instruction(s):_ 'vmlal.u16 Q0, D0, D0[0]'
* int64x2_t vmlal_n_s32 (int64x2_t, int32x2_t, int32_t)
_Form of expected instruction(s):_ 'vmlal.s32 Q0, D0, D0[0]'
* int32x4_t vmlal_n_s16 (int32x4_t, int16x4_t, int16_t)
_Form of expected instruction(s):_ 'vmlal.s16 Q0, D0, D0[0]'
* int64x2_t vqdmlal_n_s32 (int64x2_t, int32x2_t, int32_t)
_Form of expected instruction(s):_ 'vqdmlal.s32 Q0, D0, D0[0]'
* int32x4_t vqdmlal_n_s16 (int32x4_t, int16x4_t, int16_t)
_Form of expected instruction(s):_ 'vqdmlal.s16 Q0, D0, D0[0]'
5.50.3.61 Vector multiply-subtract by scalar
............................................
* float32x2_t vmls_n_f32 (float32x2_t, float32x2_t, float32_t)
_Form of expected instruction(s):_ 'vmls.f32 D0, D0, D0[0]'
* uint32x2_t vmls_n_u32 (uint32x2_t, uint32x2_t, uint32_t)
_Form of expected instruction(s):_ 'vmls.i32 D0, D0, D0[0]'
* uint16x4_t vmls_n_u16 (uint16x4_t, uint16x4_t, uint16_t)
_Form of expected instruction(s):_ 'vmls.i16 D0, D0, D0[0]'
* int32x2_t vmls_n_s32 (int32x2_t, int32x2_t, int32_t)
_Form of expected instruction(s):_ 'vmls.i32 D0, D0, D0[0]'
* int16x4_t vmls_n_s16 (int16x4_t, int16x4_t, int16_t)
_Form of expected instruction(s):_ 'vmls.i16 D0, D0, D0[0]'
* float32x4_t vmlsq_n_f32 (float32x4_t, float32x4_t, float32_t)
_Form of expected instruction(s):_ 'vmls.f32 Q0, Q0, D0[0]'
* uint32x4_t vmlsq_n_u32 (uint32x4_t, uint32x4_t, uint32_t)
_Form of expected instruction(s):_ 'vmls.i32 Q0, Q0, D0[0]'
* uint16x8_t vmlsq_n_u16 (uint16x8_t, uint16x8_t, uint16_t)
_Form of expected instruction(s):_ 'vmls.i16 Q0, Q0, D0[0]'
* int32x4_t vmlsq_n_s32 (int32x4_t, int32x4_t, int32_t)
_Form of expected instruction(s):_ 'vmls.i32 Q0, Q0, D0[0]'
* int16x8_t vmlsq_n_s16 (int16x8_t, int16x8_t, int16_t)
_Form of expected instruction(s):_ 'vmls.i16 Q0, Q0, D0[0]'
* uint64x2_t vmlsl_n_u32 (uint64x2_t, uint32x2_t, uint32_t)
_Form of expected instruction(s):_ 'vmlsl.u32 Q0, D0, D0[0]'
* uint32x4_t vmlsl_n_u16 (uint32x4_t, uint16x4_t, uint16_t)
_Form of expected instruction(s):_ 'vmlsl.u16 Q0, D0, D0[0]'
* int64x2_t vmlsl_n_s32 (int64x2_t, int32x2_t, int32_t)
_Form of expected instruction(s):_ 'vmlsl.s32 Q0, D0, D0[0]'
* int32x4_t vmlsl_n_s16 (int32x4_t, int16x4_t, int16_t)
_Form of expected instruction(s):_ 'vmlsl.s16 Q0, D0, D0[0]'
* int64x2_t vqdmlsl_n_s32 (int64x2_t, int32x2_t, int32_t)
_Form of expected instruction(s):_ 'vqdmlsl.s32 Q0, D0, D0[0]'
* int32x4_t vqdmlsl_n_s16 (int32x4_t, int16x4_t, int16_t)
_Form of expected instruction(s):_ 'vqdmlsl.s16 Q0, D0, D0[0]'
5.50.3.62 Vector extract
........................
* uint32x2_t vext_u32 (uint32x2_t, uint32x2_t, const int)
_Form of expected instruction(s):_ 'vext.32 D0, D0, D0, #0'
* uint16x4_t vext_u16 (uint16x4_t, uint16x4_t, const int)
_Form of expected instruction(s):_ 'vext.16 D0, D0, D0, #0'
* uint8x8_t vext_u8 (uint8x8_t, uint8x8_t, const int)
_Form of expected instruction(s):_ 'vext.8 D0, D0, D0, #0'
* int32x2_t vext_s32 (int32x2_t, int32x2_t, const int)
_Form of expected instruction(s):_ 'vext.32 D0, D0, D0, #0'
* int16x4_t vext_s16 (int16x4_t, int16x4_t, const int)
_Form of expected instruction(s):_ 'vext.16 D0, D0, D0, #0'
* int8x8_t vext_s8 (int8x8_t, int8x8_t, const int)
_Form of expected instruction(s):_ 'vext.8 D0, D0, D0, #0'
* uint64x1_t vext_u64 (uint64x1_t, uint64x1_t, const int)
_Form of expected instruction(s):_ 'vext.64 D0, D0, D0, #0'
* int64x1_t vext_s64 (int64x1_t, int64x1_t, const int)
_Form of expected instruction(s):_ 'vext.64 D0, D0, D0, #0'
* float32x2_t vext_f32 (float32x2_t, float32x2_t, const int)
_Form of expected instruction(s):_ 'vext.32 D0, D0, D0, #0'
* poly16x4_t vext_p16 (poly16x4_t, poly16x4_t, const int)
_Form of expected instruction(s):_ 'vext.16 D0, D0, D0, #0'
* poly8x8_t vext_p8 (poly8x8_t, poly8x8_t, const int)
_Form of expected instruction(s):_ 'vext.8 D0, D0, D0, #0'
* uint32x4_t vextq_u32 (uint32x4_t, uint32x4_t, const int)
_Form of expected instruction(s):_ 'vext.32 Q0, Q0, Q0, #0'
* uint16x8_t vextq_u16 (uint16x8_t, uint16x8_t, const int)
_Form of expected instruction(s):_ 'vext.16 Q0, Q0, Q0, #0'
* uint8x16_t vextq_u8 (uint8x16_t, uint8x16_t, const int)
_Form of expected instruction(s):_ 'vext.8 Q0, Q0, Q0, #0'
* int32x4_t vextq_s32 (int32x4_t, int32x4_t, const int)
_Form of expected instruction(s):_ 'vext.32 Q0, Q0, Q0, #0'
* int16x8_t vextq_s16 (int16x8_t, int16x8_t, const int)
_Form of expected instruction(s):_ 'vext.16 Q0, Q0, Q0, #0'
* int8x16_t vextq_s8 (int8x16_t, int8x16_t, const int)
_Form of expected instruction(s):_ 'vext.8 Q0, Q0, Q0, #0'
* uint64x2_t vextq_u64 (uint64x2_t, uint64x2_t, const int)
_Form of expected instruction(s):_ 'vext.64 Q0, Q0, Q0, #0'
* int64x2_t vextq_s64 (int64x2_t, int64x2_t, const int)
_Form of expected instruction(s):_ 'vext.64 Q0, Q0, Q0, #0'
* float32x4_t vextq_f32 (float32x4_t, float32x4_t, const int)
_Form of expected instruction(s):_ 'vext.32 Q0, Q0, Q0, #0'
* poly16x8_t vextq_p16 (poly16x8_t, poly16x8_t, const int)
_Form of expected instruction(s):_ 'vext.16 Q0, Q0, Q0, #0'
* poly8x16_t vextq_p8 (poly8x16_t, poly8x16_t, const int)
_Form of expected instruction(s):_ 'vext.8 Q0, Q0, Q0, #0'
5.50.3.63 Reverse elements
..........................
* uint32x2_t vrev64_u32 (uint32x2_t)
_Form of expected instruction(s):_ 'vrev64.32 D0, D0'
* uint16x4_t vrev64_u16 (uint16x4_t)
_Form of expected instruction(s):_ 'vrev64.16 D0, D0'
* uint8x8_t vrev64_u8 (uint8x8_t)
_Form of expected instruction(s):_ 'vrev64.8 D0, D0'
* int32x2_t vrev64_s32 (int32x2_t)
_Form of expected instruction(s):_ 'vrev64.32 D0, D0'
* int16x4_t vrev64_s16 (int16x4_t)
_Form of expected instruction(s):_ 'vrev64.16 D0, D0'
* int8x8_t vrev64_s8 (int8x8_t)
_Form of expected instruction(s):_ 'vrev64.8 D0, D0'
* float32x2_t vrev64_f32 (float32x2_t)
_Form of expected instruction(s):_ 'vrev64.32 D0, D0'
* poly16x4_t vrev64_p16 (poly16x4_t)
_Form of expected instruction(s):_ 'vrev64.16 D0, D0'
* poly8x8_t vrev64_p8 (poly8x8_t)
_Form of expected instruction(s):_ 'vrev64.8 D0, D0'
* uint32x4_t vrev64q_u32 (uint32x4_t)
_Form of expected instruction(s):_ 'vrev64.32 Q0, Q0'
* uint16x8_t vrev64q_u16 (uint16x8_t)
_Form of expected instruction(s):_ 'vrev64.16 Q0, Q0'
* uint8x16_t vrev64q_u8 (uint8x16_t)
_Form of expected instruction(s):_ 'vrev64.8 Q0, Q0'
* int32x4_t vrev64q_s32 (int32x4_t)
_Form of expected instruction(s):_ 'vrev64.32 Q0, Q0'
* int16x8_t vrev64q_s16 (int16x8_t)
_Form of expected instruction(s):_ 'vrev64.16 Q0, Q0'
* int8x16_t vrev64q_s8 (int8x16_t)
_Form of expected instruction(s):_ 'vrev64.8 Q0, Q0'
* float32x4_t vrev64q_f32 (float32x4_t)
_Form of expected instruction(s):_ 'vrev64.32 Q0, Q0'
* poly16x8_t vrev64q_p16 (poly16x8_t)
_Form of expected instruction(s):_ 'vrev64.16 Q0, Q0'
* poly8x16_t vrev64q_p8 (poly8x16_t)
_Form of expected instruction(s):_ 'vrev64.8 Q0, Q0'
* uint16x4_t vrev32_u16 (uint16x4_t)
_Form of expected instruction(s):_ 'vrev32.16 D0, D0'
* int16x4_t vrev32_s16 (int16x4_t)
_Form of expected instruction(s):_ 'vrev32.16 D0, D0'
* uint8x8_t vrev32_u8 (uint8x8_t)
_Form of expected instruction(s):_ 'vrev32.8 D0, D0'
* int8x8_t vrev32_s8 (int8x8_t)
_Form of expected instruction(s):_ 'vrev32.8 D0, D0'
* poly16x4_t vrev32_p16 (poly16x4_t)
_Form of expected instruction(s):_ 'vrev32.16 D0, D0'
* poly8x8_t vrev32_p8 (poly8x8_t)
_Form of expected instruction(s):_ 'vrev32.8 D0, D0'
* uint16x8_t vrev32q_u16 (uint16x8_t)
_Form of expected instruction(s):_ 'vrev32.16 Q0, Q0'
* int16x8_t vrev32q_s16 (int16x8_t)
_Form of expected instruction(s):_ 'vrev32.16 Q0, Q0'
* uint8x16_t vrev32q_u8 (uint8x16_t)
_Form of expected instruction(s):_ 'vrev32.8 Q0, Q0'
* int8x16_t vrev32q_s8 (int8x16_t)
_Form of expected instruction(s):_ 'vrev32.8 Q0, Q0'
* poly16x8_t vrev32q_p16 (poly16x8_t)
_Form of expected instruction(s):_ 'vrev32.16 Q0, Q0'
* poly8x16_t vrev32q_p8 (poly8x16_t)
_Form of expected instruction(s):_ 'vrev32.8 Q0, Q0'
* uint8x8_t vrev16_u8 (uint8x8_t)
_Form of expected instruction(s):_ 'vrev16.8 D0, D0'
* int8x8_t vrev16_s8 (int8x8_t)
_Form of expected instruction(s):_ 'vrev16.8 D0, D0'
* poly8x8_t vrev16_p8 (poly8x8_t)
_Form of expected instruction(s):_ 'vrev16.8 D0, D0'
* uint8x16_t vrev16q_u8 (uint8x16_t)
_Form of expected instruction(s):_ 'vrev16.8 Q0, Q0'
* int8x16_t vrev16q_s8 (int8x16_t)
_Form of expected instruction(s):_ 'vrev16.8 Q0, Q0'
* poly8x16_t vrev16q_p8 (poly8x16_t)
_Form of expected instruction(s):_ 'vrev16.8 Q0, Q0'
5.50.3.64 Bit selection
.......................
* uint32x2_t vbsl_u32 (uint32x2_t, uint32x2_t, uint32x2_t)
_Form of expected instruction(s):_ 'vbsl D0, D0, D0' _or_ 'vbit D0,
D0, D0' _or_ 'vbif D0, D0, D0'
* uint16x4_t vbsl_u16 (uint16x4_t, uint16x4_t, uint16x4_t)
_Form of expected instruction(s):_ 'vbsl D0, D0, D0' _or_ 'vbit D0,
D0, D0' _or_ 'vbif D0, D0, D0'
* uint8x8_t vbsl_u8 (uint8x8_t, uint8x8_t, uint8x8_t)
_Form of expected instruction(s):_ 'vbsl D0, D0, D0' _or_ 'vbit D0,
D0, D0' _or_ 'vbif D0, D0, D0'
* int32x2_t vbsl_s32 (uint32x2_t, int32x2_t, int32x2_t)
_Form of expected instruction(s):_ 'vbsl D0, D0, D0' _or_ 'vbit D0,
D0, D0' _or_ 'vbif D0, D0, D0'
* int16x4_t vbsl_s16 (uint16x4_t, int16x4_t, int16x4_t)
_Form of expected instruction(s):_ 'vbsl D0, D0, D0' _or_ 'vbit D0,
D0, D0' _or_ 'vbif D0, D0, D0'
* int8x8_t vbsl_s8 (uint8x8_t, int8x8_t, int8x8_t)
_Form of expected instruction(s):_ 'vbsl D0, D0, D0' _or_ 'vbit D0,
D0, D0' _or_ 'vbif D0, D0, D0'
* uint64x1_t vbsl_u64 (uint64x1_t, uint64x1_t, uint64x1_t)
_Form of expected instruction(s):_ 'vbsl D0, D0, D0' _or_ 'vbit D0,
D0, D0' _or_ 'vbif D0, D0, D0'
* int64x1_t vbsl_s64 (uint64x1_t, int64x1_t, int64x1_t)
_Form of expected instruction(s):_ 'vbsl D0, D0, D0' _or_ 'vbit D0,
D0, D0' _or_ 'vbif D0, D0, D0'
* float32x2_t vbsl_f32 (uint32x2_t, float32x2_t, float32x2_t)
_Form of expected instruction(s):_ 'vbsl D0, D0, D0' _or_ 'vbit D0,
D0, D0' _or_ 'vbif D0, D0, D0'
* poly16x4_t vbsl_p16 (uint16x4_t, poly16x4_t, poly16x4_t)
_Form of expected instruction(s):_ 'vbsl D0, D0, D0' _or_ 'vbit D0,
D0, D0' _or_ 'vbif D0, D0, D0'
* poly8x8_t vbsl_p8 (uint8x8_t, poly8x8_t, poly8x8_t)
_Form of expected instruction(s):_ 'vbsl D0, D0, D0' _or_ 'vbit D0,
D0, D0' _or_ 'vbif D0, D0, D0'
* uint32x4_t vbslq_u32 (uint32x4_t, uint32x4_t, uint32x4_t)
_Form of expected instruction(s):_ 'vbsl Q0, Q0, Q0' _or_ 'vbit Q0,
Q0, Q0' _or_ 'vbif Q0, Q0, Q0'
* uint16x8_t vbslq_u16 (uint16x8_t, uint16x8_t, uint16x8_t)
_Form of expected instruction(s):_ 'vbsl Q0, Q0, Q0' _or_ 'vbit Q0,
Q0, Q0' _or_ 'vbif Q0, Q0, Q0'
* uint8x16_t vbslq_u8 (uint8x16_t, uint8x16_t, uint8x16_t)
_Form of expected instruction(s):_ 'vbsl Q0, Q0, Q0' _or_ 'vbit Q0,
Q0, Q0' _or_ 'vbif Q0, Q0, Q0'
* int32x4_t vbslq_s32 (uint32x4_t, int32x4_t, int32x4_t)
_Form of expected instruction(s):_ 'vbsl Q0, Q0, Q0' _or_ 'vbit Q0,
Q0, Q0' _or_ 'vbif Q0, Q0, Q0'
* int16x8_t vbslq_s16 (uint16x8_t, int16x8_t, int16x8_t)
_Form of expected instruction(s):_ 'vbsl Q0, Q0, Q0' _or_ 'vbit Q0,
Q0, Q0' _or_ 'vbif Q0, Q0, Q0'
* int8x16_t vbslq_s8 (uint8x16_t, int8x16_t, int8x16_t)
_Form of expected instruction(s):_ 'vbsl Q0, Q0, Q0' _or_ 'vbit Q0,
Q0, Q0' _or_ 'vbif Q0, Q0, Q0'
* uint64x2_t vbslq_u64 (uint64x2_t, uint64x2_t, uint64x2_t)
_Form of expected instruction(s):_ 'vbsl Q0, Q0, Q0' _or_ 'vbit Q0,
Q0, Q0' _or_ 'vbif Q0, Q0, Q0'
* int64x2_t vbslq_s64 (uint64x2_t, int64x2_t, int64x2_t)
_Form of expected instruction(s):_ 'vbsl Q0, Q0, Q0' _or_ 'vbit Q0,
Q0, Q0' _or_ 'vbif Q0, Q0, Q0'
* float32x4_t vbslq_f32 (uint32x4_t, float32x4_t, float32x4_t)
_Form of expected instruction(s):_ 'vbsl Q0, Q0, Q0' _or_ 'vbit Q0,
Q0, Q0' _or_ 'vbif Q0, Q0, Q0'
* poly16x8_t vbslq_p16 (uint16x8_t, poly16x8_t, poly16x8_t)
_Form of expected instruction(s):_ 'vbsl Q0, Q0, Q0' _or_ 'vbit Q0,
Q0, Q0' _or_ 'vbif Q0, Q0, Q0'
* poly8x16_t vbslq_p8 (uint8x16_t, poly8x16_t, poly8x16_t)
_Form of expected instruction(s):_ 'vbsl Q0, Q0, Q0' _or_ 'vbit Q0,
Q0, Q0' _or_ 'vbif Q0, Q0, Q0'
5.50.3.65 Transpose elements
............................
* uint32x2x2_t vtrn_u32 (uint32x2_t, uint32x2_t)
_Form of expected instruction(s):_ 'vtrn.32 D0, D1'
* uint16x4x2_t vtrn_u16 (uint16x4_t, uint16x4_t)
_Form of expected instruction(s):_ 'vtrn.16 D0, D1'
* uint8x8x2_t vtrn_u8 (uint8x8_t, uint8x8_t)
_Form of expected instruction(s):_ 'vtrn.8 D0, D1'
* int32x2x2_t vtrn_s32 (int32x2_t, int32x2_t)
_Form of expected instruction(s):_ 'vtrn.32 D0, D1'
* int16x4x2_t vtrn_s16 (int16x4_t, int16x4_t)
_Form of expected instruction(s):_ 'vtrn.16 D0, D1'
* int8x8x2_t vtrn_s8 (int8x8_t, int8x8_t)
_Form of expected instruction(s):_ 'vtrn.8 D0, D1'
* float32x2x2_t vtrn_f32 (float32x2_t, float32x2_t)
_Form of expected instruction(s):_ 'vtrn.32 D0, D1'
* poly16x4x2_t vtrn_p16 (poly16x4_t, poly16x4_t)
_Form of expected instruction(s):_ 'vtrn.16 D0, D1'
* poly8x8x2_t vtrn_p8 (poly8x8_t, poly8x8_t)
_Form of expected instruction(s):_ 'vtrn.8 D0, D1'
* uint32x4x2_t vtrnq_u32 (uint32x4_t, uint32x4_t)
_Form of expected instruction(s):_ 'vtrn.32 Q0, Q1'
* uint16x8x2_t vtrnq_u16 (uint16x8_t, uint16x8_t)
_Form of expected instruction(s):_ 'vtrn.16 Q0, Q1'
* uint8x16x2_t vtrnq_u8 (uint8x16_t, uint8x16_t)
_Form of expected instruction(s):_ 'vtrn.8 Q0, Q1'
* int32x4x2_t vtrnq_s32 (int32x4_t, int32x4_t)
_Form of expected instruction(s):_ 'vtrn.32 Q0, Q1'
* int16x8x2_t vtrnq_s16 (int16x8_t, int16x8_t)
_Form of expected instruction(s):_ 'vtrn.16 Q0, Q1'
* int8x16x2_t vtrnq_s8 (int8x16_t, int8x16_t)
_Form of expected instruction(s):_ 'vtrn.8 Q0, Q1'
* float32x4x2_t vtrnq_f32 (float32x4_t, float32x4_t)
_Form of expected instruction(s):_ 'vtrn.32 Q0, Q1'
* poly16x8x2_t vtrnq_p16 (poly16x8_t, poly16x8_t)
_Form of expected instruction(s):_ 'vtrn.16 Q0, Q1'
* poly8x16x2_t vtrnq_p8 (poly8x16_t, poly8x16_t)
_Form of expected instruction(s):_ 'vtrn.8 Q0, Q1'
5.50.3.66 Zip elements
......................
* uint32x2x2_t vzip_u32 (uint32x2_t, uint32x2_t)
_Form of expected instruction(s):_ 'vzip.32 D0, D1'
* uint16x4x2_t vzip_u16 (uint16x4_t, uint16x4_t)
_Form of expected instruction(s):_ 'vzip.16 D0, D1'
* uint8x8x2_t vzip_u8 (uint8x8_t, uint8x8_t)
_Form of expected instruction(s):_ 'vzip.8 D0, D1'
* int32x2x2_t vzip_s32 (int32x2_t, int32x2_t)
_Form of expected instruction(s):_ 'vzip.32 D0, D1'
* int16x4x2_t vzip_s16 (int16x4_t, int16x4_t)
_Form of expected instruction(s):_ 'vzip.16 D0, D1'
* int8x8x2_t vzip_s8 (int8x8_t, int8x8_t)
_Form of expected instruction(s):_ 'vzip.8 D0, D1'
* float32x2x2_t vzip_f32 (float32x2_t, float32x2_t)
_Form of expected instruction(s):_ 'vzip.32 D0, D1'
* poly16x4x2_t vzip_p16 (poly16x4_t, poly16x4_t)
_Form of expected instruction(s):_ 'vzip.16 D0, D1'
* poly8x8x2_t vzip_p8 (poly8x8_t, poly8x8_t)
_Form of expected instruction(s):_ 'vzip.8 D0, D1'
* uint32x4x2_t vzipq_u32 (uint32x4_t, uint32x4_t)
_Form of expected instruction(s):_ 'vzip.32 Q0, Q1'
* uint16x8x2_t vzipq_u16 (uint16x8_t, uint16x8_t)
_Form of expected instruction(s):_ 'vzip.16 Q0, Q1'
* uint8x16x2_t vzipq_u8 (uint8x16_t, uint8x16_t)
_Form of expected instruction(s):_ 'vzip.8 Q0, Q1'
* int32x4x2_t vzipq_s32 (int32x4_t, int32x4_t)
_Form of expected instruction(s):_ 'vzip.32 Q0, Q1'
* int16x8x2_t vzipq_s16 (int16x8_t, int16x8_t)
_Form of expected instruction(s):_ 'vzip.16 Q0, Q1'
* int8x16x2_t vzipq_s8 (int8x16_t, int8x16_t)
_Form of expected instruction(s):_ 'vzip.8 Q0, Q1'
* float32x4x2_t vzipq_f32 (float32x4_t, float32x4_t)
_Form of expected instruction(s):_ 'vzip.32 Q0, Q1'
* poly16x8x2_t vzipq_p16 (poly16x8_t, poly16x8_t)
_Form of expected instruction(s):_ 'vzip.16 Q0, Q1'
* poly8x16x2_t vzipq_p8 (poly8x16_t, poly8x16_t)
_Form of expected instruction(s):_ 'vzip.8 Q0, Q1'
5.50.3.67 Unzip elements
........................
* uint32x2x2_t vuzp_u32 (uint32x2_t, uint32x2_t)
_Form of expected instruction(s):_ 'vuzp.32 D0, D1'
* uint16x4x2_t vuzp_u16 (uint16x4_t, uint16x4_t)
_Form of expected instruction(s):_ 'vuzp.16 D0, D1'
* uint8x8x2_t vuzp_u8 (uint8x8_t, uint8x8_t)
_Form of expected instruction(s):_ 'vuzp.8 D0, D1'
* int32x2x2_t vuzp_s32 (int32x2_t, int32x2_t)
_Form of expected instruction(s):_ 'vuzp.32 D0, D1'
* int16x4x2_t vuzp_s16 (int16x4_t, int16x4_t)
_Form of expected instruction(s):_ 'vuzp.16 D0, D1'
* int8x8x2_t vuzp_s8 (int8x8_t, int8x8_t)
_Form of expected instruction(s):_ 'vuzp.8 D0, D1'
* float32x2x2_t vuzp_f32 (float32x2_t, float32x2_t)
_Form of expected instruction(s):_ 'vuzp.32 D0, D1'
* poly16x4x2_t vuzp_p16 (poly16x4_t, poly16x4_t)
_Form of expected instruction(s):_ 'vuzp.16 D0, D1'
* poly8x8x2_t vuzp_p8 (poly8x8_t, poly8x8_t)
_Form of expected instruction(s):_ 'vuzp.8 D0, D1'
* uint32x4x2_t vuzpq_u32 (uint32x4_t, uint32x4_t)
_Form of expected instruction(s):_ 'vuzp.32 Q0, Q1'
* uint16x8x2_t vuzpq_u16 (uint16x8_t, uint16x8_t)
_Form of expected instruction(s):_ 'vuzp.16 Q0, Q1'
* uint8x16x2_t vuzpq_u8 (uint8x16_t, uint8x16_t)
_Form of expected instruction(s):_ 'vuzp.8 Q0, Q1'
* int32x4x2_t vuzpq_s32 (int32x4_t, int32x4_t)
_Form of expected instruction(s):_ 'vuzp.32 Q0, Q1'
* int16x8x2_t vuzpq_s16 (int16x8_t, int16x8_t)
_Form of expected instruction(s):_ 'vuzp.16 Q0, Q1'
* int8x16x2_t vuzpq_s8 (int8x16_t, int8x16_t)
_Form of expected instruction(s):_ 'vuzp.8 Q0, Q1'
* float32x4x2_t vuzpq_f32 (float32x4_t, float32x4_t)
_Form of expected instruction(s):_ 'vuzp.32 Q0, Q1'
* poly16x8x2_t vuzpq_p16 (poly16x8_t, poly16x8_t)
_Form of expected instruction(s):_ 'vuzp.16 Q0, Q1'
* poly8x16x2_t vuzpq_p8 (poly8x16_t, poly8x16_t)
_Form of expected instruction(s):_ 'vuzp.8 Q0, Q1'
5.50.3.68 Element/structure loads, VLD1 variants
................................................
* uint32x2_t vld1_u32 (const uint32_t *)
_Form of expected instruction(s):_ 'vld1.32 {D0}, [R0]'
* uint16x4_t vld1_u16 (const uint16_t *)
_Form of expected instruction(s):_ 'vld1.16 {D0}, [R0]'
* uint8x8_t vld1_u8 (const uint8_t *)
_Form of expected instruction(s):_ 'vld1.8 {D0}, [R0]'
* int32x2_t vld1_s32 (const int32_t *)
_Form of expected instruction(s):_ 'vld1.32 {D0}, [R0]'
* int16x4_t vld1_s16 (const int16_t *)
_Form of expected instruction(s):_ 'vld1.16 {D0}, [R0]'
* int8x8_t vld1_s8 (const int8_t *)
_Form of expected instruction(s):_ 'vld1.8 {D0}, [R0]'
* uint64x1_t vld1_u64 (const uint64_t *)
_Form of expected instruction(s):_ 'vld1.64 {D0}, [R0]'
* int64x1_t vld1_s64 (const int64_t *)
_Form of expected instruction(s):_ 'vld1.64 {D0}, [R0]'
* float32x2_t vld1_f32 (const float32_t *)
_Form of expected instruction(s):_ 'vld1.32 {D0}, [R0]'
* poly16x4_t vld1_p16 (const poly16_t *)
_Form of expected instruction(s):_ 'vld1.16 {D0}, [R0]'
* poly8x8_t vld1_p8 (const poly8_t *)
_Form of expected instruction(s):_ 'vld1.8 {D0}, [R0]'
* uint32x4_t vld1q_u32 (const uint32_t *)
_Form of expected instruction(s):_ 'vld1.32 {D0, D1}, [R0]'
* uint16x8_t vld1q_u16 (const uint16_t *)
_Form of expected instruction(s):_ 'vld1.16 {D0, D1}, [R0]'
* uint8x16_t vld1q_u8 (const uint8_t *)
_Form of expected instruction(s):_ 'vld1.8 {D0, D1}, [R0]'
* int32x4_t vld1q_s32 (const int32_t *)
_Form of expected instruction(s):_ 'vld1.32 {D0, D1}, [R0]'
* int16x8_t vld1q_s16 (const int16_t *)
_Form of expected instruction(s):_ 'vld1.16 {D0, D1}, [R0]'
* int8x16_t vld1q_s8 (const int8_t *)
_Form of expected instruction(s):_ 'vld1.8 {D0, D1}, [R0]'
* uint64x2_t vld1q_u64 (const uint64_t *)
_Form of expected instruction(s):_ 'vld1.64 {D0, D1}, [R0]'
* int64x2_t vld1q_s64 (const int64_t *)
_Form of expected instruction(s):_ 'vld1.64 {D0, D1}, [R0]'
* float32x4_t vld1q_f32 (const float32_t *)
_Form of expected instruction(s):_ 'vld1.32 {D0, D1}, [R0]'
* poly16x8_t vld1q_p16 (const poly16_t *)
_Form of expected instruction(s):_ 'vld1.16 {D0, D1}, [R0]'
* poly8x16_t vld1q_p8 (const poly8_t *)
_Form of expected instruction(s):_ 'vld1.8 {D0, D1}, [R0]'
* uint32x2_t vld1_lane_u32 (const uint32_t *, uint32x2_t, const int)
_Form of expected instruction(s):_ 'vld1.32 {D0[0]}, [R0]'
* uint16x4_t vld1_lane_u16 (const uint16_t *, uint16x4_t, const int)
_Form of expected instruction(s):_ 'vld1.16 {D0[0]}, [R0]'
* uint8x8_t vld1_lane_u8 (const uint8_t *, uint8x8_t, const int)
_Form of expected instruction(s):_ 'vld1.8 {D0[0]}, [R0]'
* int32x2_t vld1_lane_s32 (const int32_t *, int32x2_t, const int)
_Form of expected instruction(s):_ 'vld1.32 {D0[0]}, [R0]'
* int16x4_t vld1_lane_s16 (const int16_t *, int16x4_t, const int)
_Form of expected instruction(s):_ 'vld1.16 {D0[0]}, [R0]'
* int8x8_t vld1_lane_s8 (const int8_t *, int8x8_t, const int)
_Form of expected instruction(s):_ 'vld1.8 {D0[0]}, [R0]'
* float32x2_t vld1_lane_f32 (const float32_t *, float32x2_t, const
int)
_Form of expected instruction(s):_ 'vld1.32 {D0[0]}, [R0]'
* poly16x4_t vld1_lane_p16 (const poly16_t *, poly16x4_t, const int)
_Form of expected instruction(s):_ 'vld1.16 {D0[0]}, [R0]'
* poly8x8_t vld1_lane_p8 (const poly8_t *, poly8x8_t, const int)
_Form of expected instruction(s):_ 'vld1.8 {D0[0]}, [R0]'
* uint64x1_t vld1_lane_u64 (const uint64_t *, uint64x1_t, const int)
_Form of expected instruction(s):_ 'vld1.64 {D0}, [R0]'
* int64x1_t vld1_lane_s64 (const int64_t *, int64x1_t, const int)
_Form of expected instruction(s):_ 'vld1.64 {D0}, [R0]'
* uint32x4_t vld1q_lane_u32 (const uint32_t *, uint32x4_t, const int)
_Form of expected instruction(s):_ 'vld1.32 {D0[0]}, [R0]'
* uint16x8_t vld1q_lane_u16 (const uint16_t *, uint16x8_t, const int)
_Form of expected instruction(s):_ 'vld1.16 {D0[0]}, [R0]'
* uint8x16_t vld1q_lane_u8 (const uint8_t *, uint8x16_t, const int)
_Form of expected instruction(s):_ 'vld1.8 {D0[0]}, [R0]'
* int32x4_t vld1q_lane_s32 (const int32_t *, int32x4_t, const int)
_Form of expected instruction(s):_ 'vld1.32 {D0[0]}, [R0]'
* int16x8_t vld1q_lane_s16 (const int16_t *, int16x8_t, const int)
_Form of expected instruction(s):_ 'vld1.16 {D0[0]}, [R0]'
* int8x16_t vld1q_lane_s8 (const int8_t *, int8x16_t, const int)
_Form of expected instruction(s):_ 'vld1.8 {D0[0]}, [R0]'
* float32x4_t vld1q_lane_f32 (const float32_t *, float32x4_t, const
int)
_Form of expected instruction(s):_ 'vld1.32 {D0[0]}, [R0]'
* poly16x8_t vld1q_lane_p16 (const poly16_t *, poly16x8_t, const int)
_Form of expected instruction(s):_ 'vld1.16 {D0[0]}, [R0]'
* poly8x16_t vld1q_lane_p8 (const poly8_t *, poly8x16_t, const int)
_Form of expected instruction(s):_ 'vld1.8 {D0[0]}, [R0]'
* uint64x2_t vld1q_lane_u64 (const uint64_t *, uint64x2_t, const int)
_Form of expected instruction(s):_ 'vld1.64 {D0}, [R0]'
* int64x2_t vld1q_lane_s64 (const int64_t *, int64x2_t, const int)
_Form of expected instruction(s):_ 'vld1.64 {D0}, [R0]'
* uint32x2_t vld1_dup_u32 (const uint32_t *)
_Form of expected instruction(s):_ 'vld1.32 {D0[]}, [R0]'
* uint16x4_t vld1_dup_u16 (const uint16_t *)
_Form of expected instruction(s):_ 'vld1.16 {D0[]}, [R0]'
* uint8x8_t vld1_dup_u8 (const uint8_t *)
_Form of expected instruction(s):_ 'vld1.8 {D0[]}, [R0]'
* int32x2_t vld1_dup_s32 (const int32_t *)
_Form of expected instruction(s):_ 'vld1.32 {D0[]}, [R0]'
* int16x4_t vld1_dup_s16 (const int16_t *)
_Form of expected instruction(s):_ 'vld1.16 {D0[]}, [R0]'
* int8x8_t vld1_dup_s8 (const int8_t *)
_Form of expected instruction(s):_ 'vld1.8 {D0[]}, [R0]'
* float32x2_t vld1_dup_f32 (const float32_t *)
_Form of expected instruction(s):_ 'vld1.32 {D0[]}, [R0]'
* poly16x4_t vld1_dup_p16 (const poly16_t *)
_Form of expected instruction(s):_ 'vld1.16 {D0[]}, [R0]'
* poly8x8_t vld1_dup_p8 (const poly8_t *)
_Form of expected instruction(s):_ 'vld1.8 {D0[]}, [R0]'
* uint64x1_t vld1_dup_u64 (const uint64_t *)
_Form of expected instruction(s):_ 'vld1.64 {D0}, [R0]'
* int64x1_t vld1_dup_s64 (const int64_t *)
_Form of expected instruction(s):_ 'vld1.64 {D0}, [R0]'
* uint32x4_t vld1q_dup_u32 (const uint32_t *)
_Form of expected instruction(s):_ 'vld1.32 {D0[], D1[]}, [R0]'
* uint16x8_t vld1q_dup_u16 (const uint16_t *)
_Form of expected instruction(s):_ 'vld1.16 {D0[], D1[]}, [R0]'
* uint8x16_t vld1q_dup_u8 (const uint8_t *)
_Form of expected instruction(s):_ 'vld1.8 {D0[], D1[]}, [R0]'
* int32x4_t vld1q_dup_s32 (const int32_t *)
_Form of expected instruction(s):_ 'vld1.32 {D0[], D1[]}, [R0]'
* int16x8_t vld1q_dup_s16 (const int16_t *)
_Form of expected instruction(s):_ 'vld1.16 {D0[], D1[]}, [R0]'
* int8x16_t vld1q_dup_s8 (const int8_t *)
_Form of expected instruction(s):_ 'vld1.8 {D0[], D1[]}, [R0]'
* float32x4_t vld1q_dup_f32 (const float32_t *)
_Form of expected instruction(s):_ 'vld1.32 {D0[], D1[]}, [R0]'
* poly16x8_t vld1q_dup_p16 (const poly16_t *)
_Form of expected instruction(s):_ 'vld1.16 {D0[], D1[]}, [R0]'
* poly8x16_t vld1q_dup_p8 (const poly8_t *)
_Form of expected instruction(s):_ 'vld1.8 {D0[], D1[]}, [R0]'
* uint64x2_t vld1q_dup_u64 (const uint64_t *)
_Form of expected instruction(s):_ 'vld1.64 {D0, D1}, [R0]'
* int64x2_t vld1q_dup_s64 (const int64_t *)
_Form of expected instruction(s):_ 'vld1.64 {D0, D1}, [R0]'
5.50.3.69 Element/structure stores, VST1 variants
.................................................
* void vst1_u32 (uint32_t *, uint32x2_t)
_Form of expected instruction(s):_ 'vst1.32 {D0}, [R0]'
* void vst1_u16 (uint16_t *, uint16x4_t)
_Form of expected instruction(s):_ 'vst1.16 {D0}, [R0]'
* void vst1_u8 (uint8_t *, uint8x8_t)
_Form of expected instruction(s):_ 'vst1.8 {D0}, [R0]'
* void vst1_s32 (int32_t *, int32x2_t)
_Form of expected instruction(s):_ 'vst1.32 {D0}, [R0]'
* void vst1_s16 (int16_t *, int16x4_t)
_Form of expected instruction(s):_ 'vst1.16 {D0}, [R0]'
* void vst1_s8 (int8_t *, int8x8_t)
_Form of expected instruction(s):_ 'vst1.8 {D0}, [R0]'
* void vst1_u64 (uint64_t *, uint64x1_t)
_Form of expected instruction(s):_ 'vst1.64 {D0}, [R0]'
* void vst1_s64 (int64_t *, int64x1_t)
_Form of expected instruction(s):_ 'vst1.64 {D0}, [R0]'
* void vst1_f32 (float32_t *, float32x2_t)
_Form of expected instruction(s):_ 'vst1.32 {D0}, [R0]'
* void vst1_p16 (poly16_t *, poly16x4_t)
_Form of expected instruction(s):_ 'vst1.16 {D0}, [R0]'
* void vst1_p8 (poly8_t *, poly8x8_t)
_Form of expected instruction(s):_ 'vst1.8 {D0}, [R0]'
* void vst1q_u32 (uint32_t *, uint32x4_t)
_Form of expected instruction(s):_ 'vst1.32 {D0, D1}, [R0]'
* void vst1q_u16 (uint16_t *, uint16x8_t)
_Form of expected instruction(s):_ 'vst1.16 {D0, D1}, [R0]'
* void vst1q_u8 (uint8_t *, uint8x16_t)
_Form of expected instruction(s):_ 'vst1.8 {D0, D1}, [R0]'
* void vst1q_s32 (int32_t *, int32x4_t)
_Form of expected instruction(s):_ 'vst1.32 {D0, D1}, [R0]'
* void vst1q_s16 (int16_t *, int16x8_t)
_Form of expected instruction(s):_ 'vst1.16 {D0, D1}, [R0]'
* void vst1q_s8 (int8_t *, int8x16_t)
_Form of expected instruction(s):_ 'vst1.8 {D0, D1}, [R0]'
* void vst1q_u64 (uint64_t *, uint64x2_t)
_Form of expected instruction(s):_ 'vst1.64 {D0, D1}, [R0]'
* void vst1q_s64 (int64_t *, int64x2_t)
_Form of expected instruction(s):_ 'vst1.64 {D0, D1}, [R0]'
* void vst1q_f32 (float32_t *, float32x4_t)
_Form of expected instruction(s):_ 'vst1.32 {D0, D1}, [R0]'
* void vst1q_p16 (poly16_t *, poly16x8_t)
_Form of expected instruction(s):_ 'vst1.16 {D0, D1}, [R0]'
* void vst1q_p8 (poly8_t *, poly8x16_t)
_Form of expected instruction(s):_ 'vst1.8 {D0, D1}, [R0]'
* void vst1_lane_u32 (uint32_t *, uint32x2_t, const int)
_Form of expected instruction(s):_ 'vst1.32 {D0[0]}, [R0]'
* void vst1_lane_u16 (uint16_t *, uint16x4_t, const int)
_Form of expected instruction(s):_ 'vst1.16 {D0[0]}, [R0]'
* void vst1_lane_u8 (uint8_t *, uint8x8_t, const int)
_Form of expected instruction(s):_ 'vst1.8 {D0[0]}, [R0]'
* void vst1_lane_s32 (int32_t *, int32x2_t, const int)
_Form of expected instruction(s):_ 'vst1.32 {D0[0]}, [R0]'
* void vst1_lane_s16 (int16_t *, int16x4_t, const int)
_Form of expected instruction(s):_ 'vst1.16 {D0[0]}, [R0]'
* void vst1_lane_s8 (int8_t *, int8x8_t, const int)
_Form of expected instruction(s):_ 'vst1.8 {D0[0]}, [R0]'
* void vst1_lane_f32 (float32_t *, float32x2_t, const int)
_Form of expected instruction(s):_ 'vst1.32 {D0[0]}, [R0]'
* void vst1_lane_p16 (poly16_t *, poly16x4_t, const int)
_Form of expected instruction(s):_ 'vst1.16 {D0[0]}, [R0]'
* void vst1_lane_p8 (poly8_t *, poly8x8_t, const int)
_Form of expected instruction(s):_ 'vst1.8 {D0[0]}, [R0]'
* void vst1_lane_s64 (int64_t *, int64x1_t, const int)
_Form of expected instruction(s):_ 'vst1.64 {D0}, [R0]'
* void vst1_lane_u64 (uint64_t *, uint64x1_t, const int)
_Form of expected instruction(s):_ 'vst1.64 {D0}, [R0]'
* void vst1q_lane_u32 (uint32_t *, uint32x4_t, const int)
_Form of expected instruction(s):_ 'vst1.32 {D0[0]}, [R0]'
* void vst1q_lane_u16 (uint16_t *, uint16x8_t, const int)
_Form of expected instruction(s):_ 'vst1.16 {D0[0]}, [R0]'
* void vst1q_lane_u8 (uint8_t *, uint8x16_t, const int)
_Form of expected instruction(s):_ 'vst1.8 {D0[0]}, [R0]'
* void vst1q_lane_s32 (int32_t *, int32x4_t, const int)
_Form of expected instruction(s):_ 'vst1.32 {D0[0]}, [R0]'
* void vst1q_lane_s16 (int16_t *, int16x8_t, const int)
_Form of expected instruction(s):_ 'vst1.16 {D0[0]}, [R0]'
* void vst1q_lane_s8 (int8_t *, int8x16_t, const int)
_Form of expected instruction(s):_ 'vst1.8 {D0[0]}, [R0]'
* void vst1q_lane_f32 (float32_t *, float32x4_t, const int)
_Form of expected instruction(s):_ 'vst1.32 {D0[0]}, [R0]'
* void vst1q_lane_p16 (poly16_t *, poly16x8_t, const int)
_Form of expected instruction(s):_ 'vst1.16 {D0[0]}, [R0]'
* void vst1q_lane_p8 (poly8_t *, poly8x16_t, const int)
_Form of expected instruction(s):_ 'vst1.8 {D0[0]}, [R0]'
* void vst1q_lane_s64 (int64_t *, int64x2_t, const int)
_Form of expected instruction(s):_ 'vst1.64 {D0}, [R0]'
* void vst1q_lane_u64 (uint64_t *, uint64x2_t, const int)
_Form of expected instruction(s):_ 'vst1.64 {D0}, [R0]'
5.50.3.70 Element/structure loads, VLD2 variants
................................................
* uint32x2x2_t vld2_u32 (const uint32_t *)
_Form of expected instruction(s):_ 'vld2.32 {D0, D1}, [R0]'
* uint16x4x2_t vld2_u16 (const uint16_t *)
_Form of expected instruction(s):_ 'vld2.16 {D0, D1}, [R0]'
* uint8x8x2_t vld2_u8 (const uint8_t *)
_Form of expected instruction(s):_ 'vld2.8 {D0, D1}, [R0]'
* int32x2x2_t vld2_s32 (const int32_t *)
_Form of expected instruction(s):_ 'vld2.32 {D0, D1}, [R0]'
* int16x4x2_t vld2_s16 (const int16_t *)
_Form of expected instruction(s):_ 'vld2.16 {D0, D1}, [R0]'
* int8x8x2_t vld2_s8 (const int8_t *)
_Form of expected instruction(s):_ 'vld2.8 {D0, D1}, [R0]'
* float32x2x2_t vld2_f32 (const float32_t *)
_Form of expected instruction(s):_ 'vld2.32 {D0, D1}, [R0]'
* poly16x4x2_t vld2_p16 (const poly16_t *)
_Form of expected instruction(s):_ 'vld2.16 {D0, D1}, [R0]'
* poly8x8x2_t vld2_p8 (const poly8_t *)
_Form of expected instruction(s):_ 'vld2.8 {D0, D1}, [R0]'
* uint64x1x2_t vld2_u64 (const uint64_t *)
_Form of expected instruction(s):_ 'vld1.64 {D0, D1}, [R0]'
* int64x1x2_t vld2_s64 (const int64_t *)
_Form of expected instruction(s):_ 'vld1.64 {D0, D1}, [R0]'
* uint32x4x2_t vld2q_u32 (const uint32_t *)
_Form of expected instruction(s):_ 'vld2.32 {D0, D1}, [R0]'
* uint16x8x2_t vld2q_u16 (const uint16_t *)
_Form of expected instruction(s):_ 'vld2.16 {D0, D1}, [R0]'
* uint8x16x2_t vld2q_u8 (const uint8_t *)
_Form of expected instruction(s):_ 'vld2.8 {D0, D1}, [R0]'
* int32x4x2_t vld2q_s32 (const int32_t *)
_Form of expected instruction(s):_ 'vld2.32 {D0, D1}, [R0]'
* int16x8x2_t vld2q_s16 (const int16_t *)
_Form of expected instruction(s):_ 'vld2.16 {D0, D1}, [R0]'
* int8x16x2_t vld2q_s8 (const int8_t *)
_Form of expected instruction(s):_ 'vld2.8 {D0, D1}, [R0]'
* float32x4x2_t vld2q_f32 (const float32_t *)
_Form of expected instruction(s):_ 'vld2.32 {D0, D1}, [R0]'
* poly16x8x2_t vld2q_p16 (const poly16_t *)
_Form of expected instruction(s):_ 'vld2.16 {D0, D1}, [R0]'
* poly8x16x2_t vld2q_p8 (const poly8_t *)
_Form of expected instruction(s):_ 'vld2.8 {D0, D1}, [R0]'
* uint32x2x2_t vld2_lane_u32 (const uint32_t *, uint32x2x2_t, const
int)
_Form of expected instruction(s):_ 'vld2.32 {D0[0], D1[0]}, [R0]'
* uint16x4x2_t vld2_lane_u16 (const uint16_t *, uint16x4x2_t, const
int)
_Form of expected instruction(s):_ 'vld2.16 {D0[0], D1[0]}, [R0]'
* uint8x8x2_t vld2_lane_u8 (const uint8_t *, uint8x8x2_t, const int)
_Form of expected instruction(s):_ 'vld2.8 {D0[0], D1[0]}, [R0]'
* int32x2x2_t vld2_lane_s32 (const int32_t *, int32x2x2_t, const int)
_Form of expected instruction(s):_ 'vld2.32 {D0[0], D1[0]}, [R0]'
* int16x4x2_t vld2_lane_s16 (const int16_t *, int16x4x2_t, const int)
_Form of expected instruction(s):_ 'vld2.16 {D0[0], D1[0]}, [R0]'
* int8x8x2_t vld2_lane_s8 (const int8_t *, int8x8x2_t, const int)
_Form of expected instruction(s):_ 'vld2.8 {D0[0], D1[0]}, [R0]'
* float32x2x2_t vld2_lane_f32 (const float32_t *, float32x2x2_t,
const int)
_Form of expected instruction(s):_ 'vld2.32 {D0[0], D1[0]}, [R0]'
* poly16x4x2_t vld2_lane_p16 (const poly16_t *, poly16x4x2_t, const
int)
_Form of expected instruction(s):_ 'vld2.16 {D0[0], D1[0]}, [R0]'
* poly8x8x2_t vld2_lane_p8 (const poly8_t *, poly8x8x2_t, const int)
_Form of expected instruction(s):_ 'vld2.8 {D0[0], D1[0]}, [R0]'
* int32x4x2_t vld2q_lane_s32 (const int32_t *, int32x4x2_t, const
int)
_Form of expected instruction(s):_ 'vld2.32 {D0[0], D1[0]}, [R0]'
* int16x8x2_t vld2q_lane_s16 (const int16_t *, int16x8x2_t, const
int)
_Form of expected instruction(s):_ 'vld2.16 {D0[0], D1[0]}, [R0]'
* uint32x4x2_t vld2q_lane_u32 (const uint32_t *, uint32x4x2_t, const
int)
_Form of expected instruction(s):_ 'vld2.32 {D0[0], D1[0]}, [R0]'
* uint16x8x2_t vld2q_lane_u16 (const uint16_t *, uint16x8x2_t, const
int)
_Form of expected instruction(s):_ 'vld2.16 {D0[0], D1[0]}, [R0]'
* float32x4x2_t vld2q_lane_f32 (const float32_t *, float32x4x2_t,
const int)
_Form of expected instruction(s):_ 'vld2.32 {D0[0], D1[0]}, [R0]'
* poly16x8x2_t vld2q_lane_p16 (const poly16_t *, poly16x8x2_t, const
int)
_Form of expected instruction(s):_ 'vld2.16 {D0[0], D1[0]}, [R0]'
* uint32x2x2_t vld2_dup_u32 (const uint32_t *)
_Form of expected instruction(s):_ 'vld2.32 {D0[], D1[]}, [R0]'
* uint16x4x2_t vld2_dup_u16 (const uint16_t *)
_Form of expected instruction(s):_ 'vld2.16 {D0[], D1[]}, [R0]'
* uint8x8x2_t vld2_dup_u8 (const uint8_t *)
_Form of expected instruction(s):_ 'vld2.8 {D0[], D1[]}, [R0]'
* int32x2x2_t vld2_dup_s32 (const int32_t *)
_Form of expected instruction(s):_ 'vld2.32 {D0[], D1[]}, [R0]'
* int16x4x2_t vld2_dup_s16 (const int16_t *)
_Form of expected instruction(s):_ 'vld2.16 {D0[], D1[]}, [R0]'
* int8x8x2_t vld2_dup_s8 (const int8_t *)
_Form of expected instruction(s):_ 'vld2.8 {D0[], D1[]}, [R0]'
* float32x2x2_t vld2_dup_f32 (const float32_t *)
_Form of expected instruction(s):_ 'vld2.32 {D0[], D1[]}, [R0]'
* poly16x4x2_t vld2_dup_p16 (const poly16_t *)
_Form of expected instruction(s):_ 'vld2.16 {D0[], D1[]}, [R0]'
* poly8x8x2_t vld2_dup_p8 (const poly8_t *)
_Form of expected instruction(s):_ 'vld2.8 {D0[], D1[]}, [R0]'
* uint64x1x2_t vld2_dup_u64 (const uint64_t *)
_Form of expected instruction(s):_ 'vld1.64 {D0, D1}, [R0]'
* int64x1x2_t vld2_dup_s64 (const int64_t *)
_Form of expected instruction(s):_ 'vld1.64 {D0, D1}, [R0]'
5.50.3.71 Element/structure stores, VST2 variants
.................................................
* void vst2_u32 (uint32_t *, uint32x2x2_t)
_Form of expected instruction(s):_ 'vst2.32 {D0, D1}, [R0]'
* void vst2_u16 (uint16_t *, uint16x4x2_t)
_Form of expected instruction(s):_ 'vst2.16 {D0, D1}, [R0]'
* void vst2_u8 (uint8_t *, uint8x8x2_t)
_Form of expected instruction(s):_ 'vst2.8 {D0, D1}, [R0]'
* void vst2_s32 (int32_t *, int32x2x2_t)
_Form of expected instruction(s):_ 'vst2.32 {D0, D1}, [R0]'
* void vst2_s16 (int16_t *, int16x4x2_t)
_Form of expected instruction(s):_ 'vst2.16 {D0, D1}, [R0]'
* void vst2_s8 (int8_t *, int8x8x2_t)
_Form of expected instruction(s):_ 'vst2.8 {D0, D1}, [R0]'
* void vst2_f32 (float32_t *, float32x2x2_t)
_Form of expected instruction(s):_ 'vst2.32 {D0, D1}, [R0]'
* void vst2_p16 (poly16_t *, poly16x4x2_t)
_Form of expected instruction(s):_ 'vst2.16 {D0, D1}, [R0]'
* void vst2_p8 (poly8_t *, poly8x8x2_t)
_Form of expected instruction(s):_ 'vst2.8 {D0, D1}, [R0]'
* void vst2_u64 (uint64_t *, uint64x1x2_t)
_Form of expected instruction(s):_ 'vst1.64 {D0, D1}, [R0]'
* void vst2_s64 (int64_t *, int64x1x2_t)
_Form of expected instruction(s):_ 'vst1.64 {D0, D1}, [R0]'
* void vst2q_u32 (uint32_t *, uint32x4x2_t)
_Form of expected instruction(s):_ 'vst2.32 {D0, D1}, [R0]'
* void vst2q_u16 (uint16_t *, uint16x8x2_t)
_Form of expected instruction(s):_ 'vst2.16 {D0, D1}, [R0]'
* void vst2q_u8 (uint8_t *, uint8x16x2_t)
_Form of expected instruction(s):_ 'vst2.8 {D0, D1}, [R0]'
* void vst2q_s32 (int32_t *, int32x4x2_t)
_Form of expected instruction(s):_ 'vst2.32 {D0, D1}, [R0]'
* void vst2q_s16 (int16_t *, int16x8x2_t)
_Form of expected instruction(s):_ 'vst2.16 {D0, D1}, [R0]'
* void vst2q_s8 (int8_t *, int8x16x2_t)
_Form of expected instruction(s):_ 'vst2.8 {D0, D1}, [R0]'
* void vst2q_f32 (float32_t *, float32x4x2_t)
_Form of expected instruction(s):_ 'vst2.32 {D0, D1}, [R0]'
* void vst2q_p16 (poly16_t *, poly16x8x2_t)
_Form of expected instruction(s):_ 'vst2.16 {D0, D1}, [R0]'
* void vst2q_p8 (poly8_t *, poly8x16x2_t)
_Form of expected instruction(s):_ 'vst2.8 {D0, D1}, [R0]'
* void vst2_lane_u32 (uint32_t *, uint32x2x2_t, const int)
_Form of expected instruction(s):_ 'vst2.32 {D0[0], D1[0]}, [R0]'
* void vst2_lane_u16 (uint16_t *, uint16x4x2_t, const int)
_Form of expected instruction(s):_ 'vst2.16 {D0[0], D1[0]}, [R0]'
* void vst2_lane_u8 (uint8_t *, uint8x8x2_t, const int)
_Form of expected instruction(s):_ 'vst2.8 {D0[0], D1[0]}, [R0]'
* void vst2_lane_s32 (int32_t *, int32x2x2_t, const int)
_Form of expected instruction(s):_ 'vst2.32 {D0[0], D1[0]}, [R0]'
* void vst2_lane_s16 (int16_t *, int16x4x2_t, const int)
_Form of expected instruction(s):_ 'vst2.16 {D0[0], D1[0]}, [R0]'
* void vst2_lane_s8 (int8_t *, int8x8x2_t, const int)
_Form of expected instruction(s):_ 'vst2.8 {D0[0], D1[0]}, [R0]'
* void vst2_lane_f32 (float32_t *, float32x2x2_t, const int)
_Form of expected instruction(s):_ 'vst2.32 {D0[0], D1[0]}, [R0]'
* void vst2_lane_p16 (poly16_t *, poly16x4x2_t, const int)
_Form of expected instruction(s):_ 'vst2.16 {D0[0], D1[0]}, [R0]'
* void vst2_lane_p8 (poly8_t *, poly8x8x2_t, const int)
_Form of expected instruction(s):_ 'vst2.8 {D0[0], D1[0]}, [R0]'
* void vst2q_lane_s32 (int32_t *, int32x4x2_t, const int)
_Form of expected instruction(s):_ 'vst2.32 {D0[0], D1[0]}, [R0]'
* void vst2q_lane_s16 (int16_t *, int16x8x2_t, const int)
_Form of expected instruction(s):_ 'vst2.16 {D0[0], D1[0]}, [R0]'
* void vst2q_lane_u32 (uint32_t *, uint32x4x2_t, const int)
_Form of expected instruction(s):_ 'vst2.32 {D0[0], D1[0]}, [R0]'
* void vst2q_lane_u16 (uint16_t *, uint16x8x2_t, const int)
_Form of expected instruction(s):_ 'vst2.16 {D0[0], D1[0]}, [R0]'
* void vst2q_lane_f32 (float32_t *, float32x4x2_t, const int)
_Form of expected instruction(s):_ 'vst2.32 {D0[0], D1[0]}, [R0]'
* void vst2q_lane_p16 (poly16_t *, poly16x8x2_t, const int)
_Form of expected instruction(s):_ 'vst2.16 {D0[0], D1[0]}, [R0]'
5.50.3.72 Element/structure loads, VLD3 variants
................................................
* uint32x2x3_t vld3_u32 (const uint32_t *)
_Form of expected instruction(s):_ 'vld3.32 {D0, D1, D2}, [R0]'
* uint16x4x3_t vld3_u16 (const uint16_t *)
_Form of expected instruction(s):_ 'vld3.16 {D0, D1, D2}, [R0]'
* uint8x8x3_t vld3_u8 (const uint8_t *)
_Form of expected instruction(s):_ 'vld3.8 {D0, D1, D2}, [R0]'
* int32x2x3_t vld3_s32 (const int32_t *)
_Form of expected instruction(s):_ 'vld3.32 {D0, D1, D2}, [R0]'
* int16x4x3_t vld3_s16 (const int16_t *)
_Form of expected instruction(s):_ 'vld3.16 {D0, D1, D2}, [R0]'
* int8x8x3_t vld3_s8 (const int8_t *)
_Form of expected instruction(s):_ 'vld3.8 {D0, D1, D2}, [R0]'
* float32x2x3_t vld3_f32 (const float32_t *)
_Form of expected instruction(s):_ 'vld3.32 {D0, D1, D2}, [R0]'
* poly16x4x3_t vld3_p16 (const poly16_t *)
_Form of expected instruction(s):_ 'vld3.16 {D0, D1, D2}, [R0]'
* poly8x8x3_t vld3_p8 (const poly8_t *)
_Form of expected instruction(s):_ 'vld3.8 {D0, D1, D2}, [R0]'
* uint64x1x3_t vld3_u64 (const uint64_t *)
_Form of expected instruction(s):_ 'vld1.64 {D0, D1, D2}, [R0]'
* int64x1x3_t vld3_s64 (const int64_t *)
_Form of expected instruction(s):_ 'vld1.64 {D0, D1, D2}, [R0]'
* uint32x4x3_t vld3q_u32 (const uint32_t *)
_Form of expected instruction(s):_ 'vld3.32 {D0, D1, D2}, [R0]'
* uint16x8x3_t vld3q_u16 (const uint16_t *)
_Form of expected instruction(s):_ 'vld3.16 {D0, D1, D2}, [R0]'
* uint8x16x3_t vld3q_u8 (const uint8_t *)
_Form of expected instruction(s):_ 'vld3.8 {D0, D1, D2}, [R0]'
* int32x4x3_t vld3q_s32 (const int32_t *)
_Form of expected instruction(s):_ 'vld3.32 {D0, D1, D2}, [R0]'
* int16x8x3_t vld3q_s16 (const int16_t *)
_Form of expected instruction(s):_ 'vld3.16 {D0, D1, D2}, [R0]'
* int8x16x3_t vld3q_s8 (const int8_t *)
_Form of expected instruction(s):_ 'vld3.8 {D0, D1, D2}, [R0]'
* float32x4x3_t vld3q_f32 (const float32_t *)
_Form of expected instruction(s):_ 'vld3.32 {D0, D1, D2}, [R0]'
* poly16x8x3_t vld3q_p16 (const poly16_t *)
_Form of expected instruction(s):_ 'vld3.16 {D0, D1, D2}, [R0]'
* poly8x16x3_t vld3q_p8 (const poly8_t *)
_Form of expected instruction(s):_ 'vld3.8 {D0, D1, D2}, [R0]'
* uint32x2x3_t vld3_lane_u32 (const uint32_t *, uint32x2x3_t, const
int)
_Form of expected instruction(s):_ 'vld3.32 {D0[0], D1[0], D2[0]},
[R0]'
* uint16x4x3_t vld3_lane_u16 (const uint16_t *, uint16x4x3_t, const
int)
_Form of expected instruction(s):_ 'vld3.16 {D0[0], D1[0], D2[0]},
[R0]'
* uint8x8x3_t vld3_lane_u8 (const uint8_t *, uint8x8x3_t, const int)
_Form of expected instruction(s):_ 'vld3.8 {D0[0], D1[0], D2[0]},
[R0]'
* int32x2x3_t vld3_lane_s32 (const int32_t *, int32x2x3_t, const int)
_Form of expected instruction(s):_ 'vld3.32 {D0[0], D1[0], D2[0]},
[R0]'
* int16x4x3_t vld3_lane_s16 (const int16_t *, int16x4x3_t, const int)
_Form of expected instruction(s):_ 'vld3.16 {D0[0], D1[0], D2[0]},
[R0]'
* int8x8x3_t vld3_lane_s8 (const int8_t *, int8x8x3_t, const int)
_Form of expected instruction(s):_ 'vld3.8 {D0[0], D1[0], D2[0]},
[R0]'
* float32x2x3_t vld3_lane_f32 (const float32_t *, float32x2x3_t,
const int)
_Form of expected instruction(s):_ 'vld3.32 {D0[0], D1[0], D2[0]},
[R0]'
* poly16x4x3_t vld3_lane_p16 (const poly16_t *, poly16x4x3_t, const
int)
_Form of expected instruction(s):_ 'vld3.16 {D0[0], D1[0], D2[0]},
[R0]'
* poly8x8x3_t vld3_lane_p8 (const poly8_t *, poly8x8x3_t, const int)
_Form of expected instruction(s):_ 'vld3.8 {D0[0], D1[0], D2[0]},
[R0]'
* int32x4x3_t vld3q_lane_s32 (const int32_t *, int32x4x3_t, const
int)
_Form of expected instruction(s):_ 'vld3.32 {D0[0], D1[0], D2[0]},
[R0]'
* int16x8x3_t vld3q_lane_s16 (const int16_t *, int16x8x3_t, const
int)
_Form of expected instruction(s):_ 'vld3.16 {D0[0], D1[0], D2[0]},
[R0]'
* uint32x4x3_t vld3q_lane_u32 (const uint32_t *, uint32x4x3_t, const
int)
_Form of expected instruction(s):_ 'vld3.32 {D0[0], D1[0], D2[0]},
[R0]'
* uint16x8x3_t vld3q_lane_u16 (const uint16_t *, uint16x8x3_t, const
int)
_Form of expected instruction(s):_ 'vld3.16 {D0[0], D1[0], D2[0]},
[R0]'
* float32x4x3_t vld3q_lane_f32 (const float32_t *, float32x4x3_t,
const int)
_Form of expected instruction(s):_ 'vld3.32 {D0[0], D1[0], D2[0]},
[R0]'
* poly16x8x3_t vld3q_lane_p16 (const poly16_t *, poly16x8x3_t, const
int)
_Form of expected instruction(s):_ 'vld3.16 {D0[0], D1[0], D2[0]},
[R0]'
* uint32x2x3_t vld3_dup_u32 (const uint32_t *)
_Form of expected instruction(s):_ 'vld3.32 {D0[], D1[], D2[]},
[R0]'
* uint16x4x3_t vld3_dup_u16 (const uint16_t *)
_Form of expected instruction(s):_ 'vld3.16 {D0[], D1[], D2[]},
[R0]'
* uint8x8x3_t vld3_dup_u8 (const uint8_t *)
_Form of expected instruction(s):_ 'vld3.8 {D0[], D1[], D2[]},
[R0]'
* int32x2x3_t vld3_dup_s32 (const int32_t *)
_Form of expected instruction(s):_ 'vld3.32 {D0[], D1[], D2[]},
[R0]'
* int16x4x3_t vld3_dup_s16 (const int16_t *)
_Form of expected instruction(s):_ 'vld3.16 {D0[], D1[], D2[]},
[R0]'
* int8x8x3_t vld3_dup_s8 (const int8_t *)
_Form of expected instruction(s):_ 'vld3.8 {D0[], D1[], D2[]},
[R0]'
* float32x2x3_t vld3_dup_f32 (const float32_t *)
_Form of expected instruction(s):_ 'vld3.32 {D0[], D1[], D2[]},
[R0]'
* poly16x4x3_t vld3_dup_p16 (const poly16_t *)
_Form of expected instruction(s):_ 'vld3.16 {D0[], D1[], D2[]},
[R0]'
* poly8x8x3_t vld3_dup_p8 (const poly8_t *)
_Form of expected instruction(s):_ 'vld3.8 {D0[], D1[], D2[]},
[R0]'
* uint64x1x3_t vld3_dup_u64 (const uint64_t *)
_Form of expected instruction(s):_ 'vld1.64 {D0, D1, D2}, [R0]'
* int64x1x3_t vld3_dup_s64 (const int64_t *)
_Form of expected instruction(s):_ 'vld1.64 {D0, D1, D2}, [R0]'
5.50.3.73 Element/structure stores, VST3 variants
.................................................
* void vst3_u32 (uint32_t *, uint32x2x3_t)
_Form of expected instruction(s):_ 'vst3.32 {D0, D1, D2, D3}, [R0]'
* void vst3_u16 (uint16_t *, uint16x4x3_t)
_Form of expected instruction(s):_ 'vst3.16 {D0, D1, D2, D3}, [R0]'
* void vst3_u8 (uint8_t *, uint8x8x3_t)
_Form of expected instruction(s):_ 'vst3.8 {D0, D1, D2, D3}, [R0]'
* void vst3_s32 (int32_t *, int32x2x3_t)
_Form of expected instruction(s):_ 'vst3.32 {D0, D1, D2, D3}, [R0]'
* void vst3_s16 (int16_t *, int16x4x3_t)
_Form of expected instruction(s):_ 'vst3.16 {D0, D1, D2, D3}, [R0]'
* void vst3_s8 (int8_t *, int8x8x3_t)
_Form of expected instruction(s):_ 'vst3.8 {D0, D1, D2, D3}, [R0]'
* void vst3_f32 (float32_t *, float32x2x3_t)
_Form of expected instruction(s):_ 'vst3.32 {D0, D1, D2, D3}, [R0]'
* void vst3_p16 (poly16_t *, poly16x4x3_t)
_Form of expected instruction(s):_ 'vst3.16 {D0, D1, D2, D3}, [R0]'
* void vst3_p8 (poly8_t *, poly8x8x3_t)
_Form of expected instruction(s):_ 'vst3.8 {D0, D1, D2, D3}, [R0]'
* void vst3_u64 (uint64_t *, uint64x1x3_t)
_Form of expected instruction(s):_ 'vst1.64 {D0, D1, D2, D3}, [R0]'
* void vst3_s64 (int64_t *, int64x1x3_t)
_Form of expected instruction(s):_ 'vst1.64 {D0, D1, D2, D3}, [R0]'
* void vst3q_u32 (uint32_t *, uint32x4x3_t)
_Form of expected instruction(s):_ 'vst3.32 {D0, D1, D2}, [R0]'
* void vst3q_u16 (uint16_t *, uint16x8x3_t)
_Form of expected instruction(s):_ 'vst3.16 {D0, D1, D2}, [R0]'
* void vst3q_u8 (uint8_t *, uint8x16x3_t)
_Form of expected instruction(s):_ 'vst3.8 {D0, D1, D2}, [R0]'
* void vst3q_s32 (int32_t *, int32x4x3_t)
_Form of expected instruction(s):_ 'vst3.32 {D0, D1, D2}, [R0]'
* void vst3q_s16 (int16_t *, int16x8x3_t)
_Form of expected instruction(s):_ 'vst3.16 {D0, D1, D2}, [R0]'
* void vst3q_s8 (int8_t *, int8x16x3_t)
_Form of expected instruction(s):_ 'vst3.8 {D0, D1, D2}, [R0]'
* void vst3q_f32 (float32_t *, float32x4x3_t)
_Form of expected instruction(s):_ 'vst3.32 {D0, D1, D2}, [R0]'
* void vst3q_p16 (poly16_t *, poly16x8x3_t)
_Form of expected instruction(s):_ 'vst3.16 {D0, D1, D2}, [R0]'
* void vst3q_p8 (poly8_t *, poly8x16x3_t)
_Form of expected instruction(s):_ 'vst3.8 {D0, D1, D2}, [R0]'
* void vst3_lane_u32 (uint32_t *, uint32x2x3_t, const int)
_Form of expected instruction(s):_ 'vst3.32 {D0[0], D1[0], D2[0]},
[R0]'
* void vst3_lane_u16 (uint16_t *, uint16x4x3_t, const int)
_Form of expected instruction(s):_ 'vst3.16 {D0[0], D1[0], D2[0]},
[R0]'
* void vst3_lane_u8 (uint8_t *, uint8x8x3_t, const int)
_Form of expected instruction(s):_ 'vst3.8 {D0[0], D1[0], D2[0]},
[R0]'
* void vst3_lane_s32 (int32_t *, int32x2x3_t, const int)
_Form of expected instruction(s):_ 'vst3.32 {D0[0], D1[0], D2[0]},
[R0]'
* void vst3_lane_s16 (int16_t *, int16x4x3_t, const int)
_Form of expected instruction(s):_ 'vst3.16 {D0[0], D1[0], D2[0]},
[R0]'
* void vst3_lane_s8 (int8_t *, int8x8x3_t, const int)
_Form of expected instruction(s):_ 'vst3.8 {D0[0], D1[0], D2[0]},
[R0]'
* void vst3_lane_f32 (float32_t *, float32x2x3_t, const int)
_Form of expected instruction(s):_ 'vst3.32 {D0[0], D1[0], D2[0]},
[R0]'
* void vst3_lane_p16 (poly16_t *, poly16x4x3_t, const int)
_Form of expected instruction(s):_ 'vst3.16 {D0[0], D1[0], D2[0]},
[R0]'
* void vst3_lane_p8 (poly8_t *, poly8x8x3_t, const int)
_Form of expected instruction(s):_ 'vst3.8 {D0[0], D1[0], D2[0]},
[R0]'
* void vst3q_lane_s32 (int32_t *, int32x4x3_t, const int)
_Form of expected instruction(s):_ 'vst3.32 {D0[0], D1[0], D2[0]},
[R0]'
* void vst3q_lane_s16 (int16_t *, int16x8x3_t, const int)
_Form of expected instruction(s):_ 'vst3.16 {D0[0], D1[0], D2[0]},
[R0]'
* void vst3q_lane_u32 (uint32_t *, uint32x4x3_t, const int)
_Form of expected instruction(s):_ 'vst3.32 {D0[0], D1[0], D2[0]},
[R0]'
* void vst3q_lane_u16 (uint16_t *, uint16x8x3_t, const int)
_Form of expected instruction(s):_ 'vst3.16 {D0[0], D1[0], D2[0]},
[R0]'
* void vst3q_lane_f32 (float32_t *, float32x4x3_t, const int)
_Form of expected instruction(s):_ 'vst3.32 {D0[0], D1[0], D2[0]},
[R0]'
* void vst3q_lane_p16 (poly16_t *, poly16x8x3_t, const int)
_Form of expected instruction(s):_ 'vst3.16 {D0[0], D1[0], D2[0]},
[R0]'
5.50.3.74 Element/structure loads, VLD4 variants
................................................
* uint32x2x4_t vld4_u32 (const uint32_t *)
_Form of expected instruction(s):_ 'vld4.32 {D0, D1, D2, D3}, [R0]'
* uint16x4x4_t vld4_u16 (const uint16_t *)
_Form of expected instruction(s):_ 'vld4.16 {D0, D1, D2, D3}, [R0]'
* uint8x8x4_t vld4_u8 (const uint8_t *)
_Form of expected instruction(s):_ 'vld4.8 {D0, D1, D2, D3}, [R0]'
* int32x2x4_t vld4_s32 (const int32_t *)
_Form of expected instruction(s):_ 'vld4.32 {D0, D1, D2, D3}, [R0]'
* int16x4x4_t vld4_s16 (const int16_t *)
_Form of expected instruction(s):_ 'vld4.16 {D0, D1, D2, D3}, [R0]'
* int8x8x4_t vld4_s8 (const int8_t *)
_Form of expected instruction(s):_ 'vld4.8 {D0, D1, D2, D3}, [R0]'
* float32x2x4_t vld4_f32 (const float32_t *)
_Form of expected instruction(s):_ 'vld4.32 {D0, D1, D2, D3}, [R0]'
* poly16x4x4_t vld4_p16 (const poly16_t *)
_Form of expected instruction(s):_ 'vld4.16 {D0, D1, D2, D3}, [R0]'
* poly8x8x4_t vld4_p8 (const poly8_t *)
_Form of expected instruction(s):_ 'vld4.8 {D0, D1, D2, D3}, [R0]'
* uint64x1x4_t vld4_u64 (const uint64_t *)
_Form of expected instruction(s):_ 'vld1.64 {D0, D1, D2, D3}, [R0]'
* int64x1x4_t vld4_s64 (const int64_t *)
_Form of expected instruction(s):_ 'vld1.64 {D0, D1, D2, D3}, [R0]'
* uint32x4x4_t vld4q_u32 (const uint32_t *)
_Form of expected instruction(s):_ 'vld4.32 {D0, D1, D2, D3}, [R0]'
* uint16x8x4_t vld4q_u16 (const uint16_t *)
_Form of expected instruction(s):_ 'vld4.16 {D0, D1, D2, D3}, [R0]'
* uint8x16x4_t vld4q_u8 (const uint8_t *)
_Form of expected instruction(s):_ 'vld4.8 {D0, D1, D2, D3}, [R0]'
* int32x4x4_t vld4q_s32 (const int32_t *)
_Form of expected instruction(s):_ 'vld4.32 {D0, D1, D2, D3}, [R0]'
* int16x8x4_t vld4q_s16 (const int16_t *)
_Form of expected instruction(s):_ 'vld4.16 {D0, D1, D2, D3}, [R0]'
* int8x16x4_t vld4q_s8 (const int8_t *)
_Form of expected instruction(s):_ 'vld4.8 {D0, D1, D2, D3}, [R0]'
* float32x4x4_t vld4q_f32 (const float32_t *)
_Form of expected instruction(s):_ 'vld4.32 {D0, D1, D2, D3}, [R0]'
* poly16x8x4_t vld4q_p16 (const poly16_t *)
_Form of expected instruction(s):_ 'vld4.16 {D0, D1, D2, D3}, [R0]'
* poly8x16x4_t vld4q_p8 (const poly8_t *)
_Form of expected instruction(s):_ 'vld4.8 {D0, D1, D2, D3}, [R0]'
* uint32x2x4_t vld4_lane_u32 (const uint32_t *, uint32x2x4_t, const
int)
_Form of expected instruction(s):_ 'vld4.32 {D0[0], D1[0], D2[0],
D3[0]}, [R0]'
* uint16x4x4_t vld4_lane_u16 (const uint16_t *, uint16x4x4_t, const
int)
_Form of expected instruction(s):_ 'vld4.16 {D0[0], D1[0], D2[0],
D3[0]}, [R0]'
* uint8x8x4_t vld4_lane_u8 (const uint8_t *, uint8x8x4_t, const int)
_Form of expected instruction(s):_ 'vld4.8 {D0[0], D1[0], D2[0],
D3[0]}, [R0]'
* int32x2x4_t vld4_lane_s32 (const int32_t *, int32x2x4_t, const int)
_Form of expected instruction(s):_ 'vld4.32 {D0[0], D1[0], D2[0],
D3[0]}, [R0]'
* int16x4x4_t vld4_lane_s16 (const int16_t *, int16x4x4_t, const int)
_Form of expected instruction(s):_ 'vld4.16 {D0[0], D1[0], D2[0],
D3[0]}, [R0]'
* int8x8x4_t vld4_lane_s8 (const int8_t *, int8x8x4_t, const int)
_Form of expected instruction(s):_ 'vld4.8 {D0[0], D1[0], D2[0],
D3[0]}, [R0]'
* float32x2x4_t vld4_lane_f32 (const float32_t *, float32x2x4_t,
const int)
_Form of expected instruction(s):_ 'vld4.32 {D0[0], D1[0], D2[0],
D3[0]}, [R0]'
* poly16x4x4_t vld4_lane_p16 (const poly16_t *, poly16x4x4_t, const
int)
_Form of expected instruction(s):_ 'vld4.16 {D0[0], D1[0], D2[0],
D3[0]}, [R0]'
* poly8x8x4_t vld4_lane_p8 (const poly8_t *, poly8x8x4_t, const int)
_Form of expected instruction(s):_ 'vld4.8 {D0[0], D1[0], D2[0],
D3[0]}, [R0]'
* int32x4x4_t vld4q_lane_s32 (const int32_t *, int32x4x4_t, const
int)
_Form of expected instruction(s):_ 'vld4.32 {D0[0], D1[0], D2[0],
D3[0]}, [R0]'
* int16x8x4_t vld4q_lane_s16 (const int16_t *, int16x8x4_t, const
int)
_Form of expected instruction(s):_ 'vld4.16 {D0[0], D1[0], D2[0],
D3[0]}, [R0]'
* uint32x4x4_t vld4q_lane_u32 (const uint32_t *, uint32x4x4_t, const
int)
_Form of expected instruction(s):_ 'vld4.32 {D0[0], D1[0], D2[0],
D3[0]}, [R0]'
* uint16x8x4_t vld4q_lane_u16 (const uint16_t *, uint16x8x4_t, const
int)
_Form of expected instruction(s):_ 'vld4.16 {D0[0], D1[0], D2[0],
D3[0]}, [R0]'
* float32x4x4_t vld4q_lane_f32 (const float32_t *, float32x4x4_t,
const int)
_Form of expected instruction(s):_ 'vld4.32 {D0[0], D1[0], D2[0],
D3[0]}, [R0]'
* poly16x8x4_t vld4q_lane_p16 (const poly16_t *, poly16x8x4_t, const
int)
_Form of expected instruction(s):_ 'vld4.16 {D0[0], D1[0], D2[0],
D3[0]}, [R0]'
* uint32x2x4_t vld4_dup_u32 (const uint32_t *)
_Form of expected instruction(s):_ 'vld4.32 {D0[], D1[], D2[],
D3[]}, [R0]'
* uint16x4x4_t vld4_dup_u16 (const uint16_t *)
_Form of expected instruction(s):_ 'vld4.16 {D0[], D1[], D2[],
D3[]}, [R0]'
* uint8x8x4_t vld4_dup_u8 (const uint8_t *)
_Form of expected instruction(s):_ 'vld4.8 {D0[], D1[], D2[],
D3[]}, [R0]'
* int32x2x4_t vld4_dup_s32 (const int32_t *)
_Form of expected instruction(s):_ 'vld4.32 {D0[], D1[], D2[],
D3[]}, [R0]'
* int16x4x4_t vld4_dup_s16 (const int16_t *)
_Form of expected instruction(s):_ 'vld4.16 {D0[], D1[], D2[],
D3[]}, [R0]'
* int8x8x4_t vld4_dup_s8 (const int8_t *)
_Form of expected instruction(s):_ 'vld4.8 {D0[], D1[], D2[],
D3[]}, [R0]'
* float32x2x4_t vld4_dup_f32 (const float32_t *)
_Form of expected instruction(s):_ 'vld4.32 {D0[], D1[], D2[],
D3[]}, [R0]'
* poly16x4x4_t vld4_dup_p16 (const poly16_t *)
_Form of expected instruction(s):_ 'vld4.16 {D0[], D1[], D2[],
D3[]}, [R0]'
* poly8x8x4_t vld4_dup_p8 (const poly8_t *)
_Form of expected instruction(s):_ 'vld4.8 {D0[], D1[], D2[],
D3[]}, [R0]'
* uint64x1x4_t vld4_dup_u64 (const uint64_t *)
_Form of expected instruction(s):_ 'vld1.64 {D0, D1, D2, D3}, [R0]'
* int64x1x4_t vld4_dup_s64 (const int64_t *)
_Form of expected instruction(s):_ 'vld1.64 {D0, D1, D2, D3}, [R0]'
5.50.3.75 Element/structure stores, VST4 variants
.................................................
* void vst4_u32 (uint32_t *, uint32x2x4_t)
_Form of expected instruction(s):_ 'vst4.32 {D0, D1, D2, D3}, [R0]'
* void vst4_u16 (uint16_t *, uint16x4x4_t)
_Form of expected instruction(s):_ 'vst4.16 {D0, D1, D2, D3}, [R0]'
* void vst4_u8 (uint8_t *, uint8x8x4_t)
_Form of expected instruction(s):_ 'vst4.8 {D0, D1, D2, D3}, [R0]'
* void vst4_s32 (int32_t *, int32x2x4_t)
_Form of expected instruction(s):_ 'vst4.32 {D0, D1, D2, D3}, [R0]'
* void vst4_s16 (int16_t *, int16x4x4_t)
_Form of expected instruction(s):_ 'vst4.16 {D0, D1, D2, D3}, [R0]'
* void vst4_s8 (int8_t *, int8x8x4_t)
_Form of expected instruction(s):_ 'vst4.8 {D0, D1, D2, D3}, [R0]'
* void vst4_f32 (float32_t *, float32x2x4_t)
_Form of expected instruction(s):_ 'vst4.32 {D0, D1, D2, D3}, [R0]'
* void vst4_p16 (poly16_t *, poly16x4x4_t)
_Form of expected instruction(s):_ 'vst4.16 {D0, D1, D2, D3}, [R0]'
* void vst4_p8 (poly8_t *, poly8x8x4_t)
_Form of expected instruction(s):_ 'vst4.8 {D0, D1, D2, D3}, [R0]'
* void vst4_u64 (uint64_t *, uint64x1x4_t)
_Form of expected instruction(s):_ 'vst1.64 {D0, D1, D2, D3}, [R0]'
* void vst4_s64 (int64_t *, int64x1x4_t)
_Form of expected instruction(s):_ 'vst1.64 {D0, D1, D2, D3}, [R0]'
* void vst4q_u32 (uint32_t *, uint32x4x4_t)
_Form of expected instruction(s):_ 'vst4.32 {D0, D1, D2, D3}, [R0]'
* void vst4q_u16 (uint16_t *, uint16x8x4_t)
_Form of expected instruction(s):_ 'vst4.16 {D0, D1, D2, D3}, [R0]'
* void vst4q_u8 (uint8_t *, uint8x16x4_t)
_Form of expected instruction(s):_ 'vst4.8 {D0, D1, D2, D3}, [R0]'
* void vst4q_s32 (int32_t *, int32x4x4_t)
_Form of expected instruction(s):_ 'vst4.32 {D0, D1, D2, D3}, [R0]'
* void vst4q_s16 (int16_t *, int16x8x4_t)
_Form of expected instruction(s):_ 'vst4.16 {D0, D1, D2, D3}, [R0]'
* void vst4q_s8 (int8_t *, int8x16x4_t)
_Form of expected instruction(s):_ 'vst4.8 {D0, D1, D2, D3}, [R0]'
* void vst4q_f32 (float32_t *, float32x4x4_t)
_Form of expected instruction(s):_ 'vst4.32 {D0, D1, D2, D3}, [R0]'
* void vst4q_p16 (poly16_t *, poly16x8x4_t)
_Form of expected instruction(s):_ 'vst4.16 {D0, D1, D2, D3}, [R0]'
* void vst4q_p8 (poly8_t *, poly8x16x4_t)
_Form of expected instruction(s):_ 'vst4.8 {D0, D1, D2, D3}, [R0]'
* void vst4_lane_u32 (uint32_t *, uint32x2x4_t, const int)
_Form of expected instruction(s):_ 'vst4.32 {D0[0], D1[0], D2[0],
D3[0]}, [R0]'
* void vst4_lane_u16 (uint16_t *, uint16x4x4_t, const int)
_Form of expected instruction(s):_ 'vst4.16 {D0[0], D1[0], D2[0],
D3[0]}, [R0]'
* void vst4_lane_u8 (uint8_t *, uint8x8x4_t, const int)
_Form of expected instruction(s):_ 'vst4.8 {D0[0], D1[0], D2[0],
D3[0]}, [R0]'
* void vst4_lane_s32 (int32_t *, int32x2x4_t, const int)
_Form of expected instruction(s):_ 'vst4.32 {D0[0], D1[0], D2[0],
D3[0]}, [R0]'
* void vst4_lane_s16 (int16_t *, int16x4x4_t, const int)
_Form of expected instruction(s):_ 'vst4.16 {D0[0], D1[0], D2[0],
D3[0]}, [R0]'
* void vst4_lane_s8 (int8_t *, int8x8x4_t, const int)
_Form of expected instruction(s):_ 'vst4.8 {D0[0], D1[0], D2[0],
D3[0]}, [R0]'
* void vst4_lane_f32 (float32_t *, float32x2x4_t, const int)
_Form of expected instruction(s):_ 'vst4.32 {D0[0], D1[0], D2[0],
D3[0]}, [R0]'
* void vst4_lane_p16 (poly16_t *, poly16x4x4_t, const int)
_Form of expected instruction(s):_ 'vst4.16 {D0[0], D1[0], D2[0],
D3[0]}, [R0]'
* void vst4_lane_p8 (poly8_t *, poly8x8x4_t, const int)
_Form of expected instruction(s):_ 'vst4.8 {D0[0], D1[0], D2[0],
D3[0]}, [R0]'
* void vst4q_lane_s32 (int32_t *, int32x4x4_t, const int)
_Form of expected instruction(s):_ 'vst4.32 {D0[0], D1[0], D2[0],
D3[0]}, [R0]'
* void vst4q_lane_s16 (int16_t *, int16x8x4_t, const int)
_Form of expected instruction(s):_ 'vst4.16 {D0[0], D1[0], D2[0],
D3[0]}, [R0]'
* void vst4q_lane_u32 (uint32_t *, uint32x4x4_t, const int)
_Form of expected instruction(s):_ 'vst4.32 {D0[0], D1[0], D2[0],
D3[0]}, [R0]'
* void vst4q_lane_u16 (uint16_t *, uint16x8x4_t, const int)
_Form of expected instruction(s):_ 'vst4.16 {D0[0], D1[0], D2[0],
D3[0]}, [R0]'
* void vst4q_lane_f32 (float32_t *, float32x4x4_t, const int)
_Form of expected instruction(s):_ 'vst4.32 {D0[0], D1[0], D2[0],
D3[0]}, [R0]'
* void vst4q_lane_p16 (poly16_t *, poly16x8x4_t, const int)
_Form of expected instruction(s):_ 'vst4.16 {D0[0], D1[0], D2[0],
D3[0]}, [R0]'
5.50.3.76 Logical operations (AND)
..................................
* uint32x2_t vand_u32 (uint32x2_t, uint32x2_t)
_Form of expected instruction(s):_ 'vand D0, D0, D0'
* uint16x4_t vand_u16 (uint16x4_t, uint16x4_t)
_Form of expected instruction(s):_ 'vand D0, D0, D0'
* uint8x8_t vand_u8 (uint8x8_t, uint8x8_t)
_Form of expected instruction(s):_ 'vand D0, D0, D0'
* int32x2_t vand_s32 (int32x2_t, int32x2_t)
_Form of expected instruction(s):_ 'vand D0, D0, D0'
* int16x4_t vand_s16 (int16x4_t, int16x4_t)
_Form of expected instruction(s):_ 'vand D0, D0, D0'
* int8x8_t vand_s8 (int8x8_t, int8x8_t)
_Form of expected instruction(s):_ 'vand D0, D0, D0'
* uint64x1_t vand_u64 (uint64x1_t, uint64x1_t)
_Form of expected instruction(s):_ 'vand D0, D0, D0'
* int64x1_t vand_s64 (int64x1_t, int64x1_t)
_Form of expected instruction(s):_ 'vand D0, D0, D0'
* uint32x4_t vandq_u32 (uint32x4_t, uint32x4_t)
_Form of expected instruction(s):_ 'vand Q0, Q0, Q0'
* uint16x8_t vandq_u16 (uint16x8_t, uint16x8_t)
_Form of expected instruction(s):_ 'vand Q0, Q0, Q0'
* uint8x16_t vandq_u8 (uint8x16_t, uint8x16_t)
_Form of expected instruction(s):_ 'vand Q0, Q0, Q0'
* int32x4_t vandq_s32 (int32x4_t, int32x4_t)
_Form of expected instruction(s):_ 'vand Q0, Q0, Q0'
* int16x8_t vandq_s16 (int16x8_t, int16x8_t)
_Form of expected instruction(s):_ 'vand Q0, Q0, Q0'
* int8x16_t vandq_s8 (int8x16_t, int8x16_t)
_Form of expected instruction(s):_ 'vand Q0, Q0, Q0'
* uint64x2_t vandq_u64 (uint64x2_t, uint64x2_t)
_Form of expected instruction(s):_ 'vand Q0, Q0, Q0'
* int64x2_t vandq_s64 (int64x2_t, int64x2_t)
_Form of expected instruction(s):_ 'vand Q0, Q0, Q0'
5.50.3.77 Logical operations (OR)
.................................
* uint32x2_t vorr_u32 (uint32x2_t, uint32x2_t)
_Form of expected instruction(s):_ 'vorr D0, D0, D0'
* uint16x4_t vorr_u16 (uint16x4_t, uint16x4_t)
_Form of expected instruction(s):_ 'vorr D0, D0, D0'
* uint8x8_t vorr_u8 (uint8x8_t, uint8x8_t)
_Form of expected instruction(s):_ 'vorr D0, D0, D0'
* int32x2_t vorr_s32 (int32x2_t, int32x2_t)
_Form of expected instruction(s):_ 'vorr D0, D0, D0'
* int16x4_t vorr_s16 (int16x4_t, int16x4_t)
_Form of expected instruction(s):_ 'vorr D0, D0, D0'
* int8x8_t vorr_s8 (int8x8_t, int8x8_t)
_Form of expected instruction(s):_ 'vorr D0, D0, D0'
* uint64x1_t vorr_u64 (uint64x1_t, uint64x1_t)
_Form of expected instruction(s):_ 'vorr D0, D0, D0'
* int64x1_t vorr_s64 (int64x1_t, int64x1_t)
_Form of expected instruction(s):_ 'vorr D0, D0, D0'
* uint32x4_t vorrq_u32 (uint32x4_t, uint32x4_t)
_Form of expected instruction(s):_ 'vorr Q0, Q0, Q0'
* uint16x8_t vorrq_u16 (uint16x8_t, uint16x8_t)
_Form of expected instruction(s):_ 'vorr Q0, Q0, Q0'
* uint8x16_t vorrq_u8 (uint8x16_t, uint8x16_t)
_Form of expected instruction(s):_ 'vorr Q0, Q0, Q0'
* int32x4_t vorrq_s32 (int32x4_t, int32x4_t)
_Form of expected instruction(s):_ 'vorr Q0, Q0, Q0'
* int16x8_t vorrq_s16 (int16x8_t, int16x8_t)
_Form of expected instruction(s):_ 'vorr Q0, Q0, Q0'
* int8x16_t vorrq_s8 (int8x16_t, int8x16_t)
_Form of expected instruction(s):_ 'vorr Q0, Q0, Q0'
* uint64x2_t vorrq_u64 (uint64x2_t, uint64x2_t)
_Form of expected instruction(s):_ 'vorr Q0, Q0, Q0'
* int64x2_t vorrq_s64 (int64x2_t, int64x2_t)
_Form of expected instruction(s):_ 'vorr Q0, Q0, Q0'
5.50.3.78 Logical operations (exclusive OR)
...........................................
* uint32x2_t veor_u32 (uint32x2_t, uint32x2_t)
_Form of expected instruction(s):_ 'veor D0, D0, D0'
* uint16x4_t veor_u16 (uint16x4_t, uint16x4_t)
_Form of expected instruction(s):_ 'veor D0, D0, D0'
* uint8x8_t veor_u8 (uint8x8_t, uint8x8_t)
_Form of expected instruction(s):_ 'veor D0, D0, D0'
* int32x2_t veor_s32 (int32x2_t, int32x2_t)
_Form of expected instruction(s):_ 'veor D0, D0, D0'
* int16x4_t veor_s16 (int16x4_t, int16x4_t)
_Form of expected instruction(s):_ 'veor D0, D0, D0'
* int8x8_t veor_s8 (int8x8_t, int8x8_t)
_Form of expected instruction(s):_ 'veor D0, D0, D0'
* uint64x1_t veor_u64 (uint64x1_t, uint64x1_t)
_Form of expected instruction(s):_ 'veor D0, D0, D0'
* int64x1_t veor_s64 (int64x1_t, int64x1_t)
_Form of expected instruction(s):_ 'veor D0, D0, D0'
* uint32x4_t veorq_u32 (uint32x4_t, uint32x4_t)
_Form of expected instruction(s):_ 'veor Q0, Q0, Q0'
* uint16x8_t veorq_u16 (uint16x8_t, uint16x8_t)
_Form of expected instruction(s):_ 'veor Q0, Q0, Q0'
* uint8x16_t veorq_u8 (uint8x16_t, uint8x16_t)
_Form of expected instruction(s):_ 'veor Q0, Q0, Q0'
* int32x4_t veorq_s32 (int32x4_t, int32x4_t)
_Form of expected instruction(s):_ 'veor Q0, Q0, Q0'
* int16x8_t veorq_s16 (int16x8_t, int16x8_t)
_Form of expected instruction(s):_ 'veor Q0, Q0, Q0'
* int8x16_t veorq_s8 (int8x16_t, int8x16_t)
_Form of expected instruction(s):_ 'veor Q0, Q0, Q0'
* uint64x2_t veorq_u64 (uint64x2_t, uint64x2_t)
_Form of expected instruction(s):_ 'veor Q0, Q0, Q0'
* int64x2_t veorq_s64 (int64x2_t, int64x2_t)
_Form of expected instruction(s):_ 'veor Q0, Q0, Q0'
5.50.3.79 Logical operations (AND-NOT)
......................................
* uint32x2_t vbic_u32 (uint32x2_t, uint32x2_t)
_Form of expected instruction(s):_ 'vbic D0, D0, D0'
* uint16x4_t vbic_u16 (uint16x4_t, uint16x4_t)
_Form of expected instruction(s):_ 'vbic D0, D0, D0'
* uint8x8_t vbic_u8 (uint8x8_t, uint8x8_t)
_Form of expected instruction(s):_ 'vbic D0, D0, D0'
* int32x2_t vbic_s32 (int32x2_t, int32x2_t)
_Form of expected instruction(s):_ 'vbic D0, D0, D0'
* int16x4_t vbic_s16 (int16x4_t, int16x4_t)
_Form of expected instruction(s):_ 'vbic D0, D0, D0'
* int8x8_t vbic_s8 (int8x8_t, int8x8_t)
_Form of expected instruction(s):_ 'vbic D0, D0, D0'
* uint64x1_t vbic_u64 (uint64x1_t, uint64x1_t)
_Form of expected instruction(s):_ 'vbic D0, D0, D0'
* int64x1_t vbic_s64 (int64x1_t, int64x1_t)
_Form of expected instruction(s):_ 'vbic D0, D0, D0'
* uint32x4_t vbicq_u32 (uint32x4_t, uint32x4_t)
_Form of expected instruction(s):_ 'vbic Q0, Q0, Q0'
* uint16x8_t vbicq_u16 (uint16x8_t, uint16x8_t)
_Form of expected instruction(s):_ 'vbic Q0, Q0, Q0'
* uint8x16_t vbicq_u8 (uint8x16_t, uint8x16_t)
_Form of expected instruction(s):_ 'vbic Q0, Q0, Q0'
* int32x4_t vbicq_s32 (int32x4_t, int32x4_t)
_Form of expected instruction(s):_ 'vbic Q0, Q0, Q0'
* int16x8_t vbicq_s16 (int16x8_t, int16x8_t)
_Form of expected instruction(s):_ 'vbic Q0, Q0, Q0'
* int8x16_t vbicq_s8 (int8x16_t, int8x16_t)
_Form of expected instruction(s):_ 'vbic Q0, Q0, Q0'
* uint64x2_t vbicq_u64 (uint64x2_t, uint64x2_t)
_Form of expected instruction(s):_ 'vbic Q0, Q0, Q0'
* int64x2_t vbicq_s64 (int64x2_t, int64x2_t)
_Form of expected instruction(s):_ 'vbic Q0, Q0, Q0'
5.50.3.80 Logical operations (OR-NOT)
.....................................
* uint32x2_t vorn_u32 (uint32x2_t, uint32x2_t)
_Form of expected instruction(s):_ 'vorn D0, D0, D0'
* uint16x4_t vorn_u16 (uint16x4_t, uint16x4_t)
_Form of expected instruction(s):_ 'vorn D0, D0, D0'
* uint8x8_t vorn_u8 (uint8x8_t, uint8x8_t)
_Form of expected instruction(s):_ 'vorn D0, D0, D0'
* int32x2_t vorn_s32 (int32x2_t, int32x2_t)
_Form of expected instruction(s):_ 'vorn D0, D0, D0'
* int16x4_t vorn_s16 (int16x4_t, int16x4_t)
_Form of expected instruction(s):_ 'vorn D0, D0, D0'
* int8x8_t vorn_s8 (int8x8_t, int8x8_t)
_Form of expected instruction(s):_ 'vorn D0, D0, D0'
* uint64x1_t vorn_u64 (uint64x1_t, uint64x1_t)
_Form of expected instruction(s):_ 'vorn D0, D0, D0'
* int64x1_t vorn_s64 (int64x1_t, int64x1_t)
_Form of expected instruction(s):_ 'vorn D0, D0, D0'
* uint32x4_t vornq_u32 (uint32x4_t, uint32x4_t)
_Form of expected instruction(s):_ 'vorn Q0, Q0, Q0'
* uint16x8_t vornq_u16 (uint16x8_t, uint16x8_t)
_Form of expected instruction(s):_ 'vorn Q0, Q0, Q0'
* uint8x16_t vornq_u8 (uint8x16_t, uint8x16_t)
_Form of expected instruction(s):_ 'vorn Q0, Q0, Q0'
* int32x4_t vornq_s32 (int32x4_t, int32x4_t)
_Form of expected instruction(s):_ 'vorn Q0, Q0, Q0'
* int16x8_t vornq_s16 (int16x8_t, int16x8_t)
_Form of expected instruction(s):_ 'vorn Q0, Q0, Q0'
* int8x16_t vornq_s8 (int8x16_t, int8x16_t)
_Form of expected instruction(s):_ 'vorn Q0, Q0, Q0'
* uint64x2_t vornq_u64 (uint64x2_t, uint64x2_t)
_Form of expected instruction(s):_ 'vorn Q0, Q0, Q0'
* int64x2_t vornq_s64 (int64x2_t, int64x2_t)
_Form of expected instruction(s):_ 'vorn Q0, Q0, Q0'
5.50.3.81 Reinterpret casts
...........................
* poly8x8_t vreinterpret_p8_u32 (uint32x2_t)
* poly8x8_t vreinterpret_p8_u16 (uint16x4_t)
* poly8x8_t vreinterpret_p8_u8 (uint8x8_t)
* poly8x8_t vreinterpret_p8_s32 (int32x2_t)
* poly8x8_t vreinterpret_p8_s16 (int16x4_t)
* poly8x8_t vreinterpret_p8_s8 (int8x8_t)
* poly8x8_t vreinterpret_p8_u64 (uint64x1_t)
* poly8x8_t vreinterpret_p8_s64 (int64x1_t)
* poly8x8_t vreinterpret_p8_f32 (float32x2_t)
* poly8x8_t vreinterpret_p8_p16 (poly16x4_t)
* poly8x16_t vreinterpretq_p8_u32 (uint32x4_t)
* poly8x16_t vreinterpretq_p8_u16 (uint16x8_t)
* poly8x16_t vreinterpretq_p8_u8 (uint8x16_t)
* poly8x16_t vreinterpretq_p8_s32 (int32x4_t)
* poly8x16_t vreinterpretq_p8_s16 (int16x8_t)
* poly8x16_t vreinterpretq_p8_s8 (int8x16_t)
* poly8x16_t vreinterpretq_p8_u64 (uint64x2_t)
* poly8x16_t vreinterpretq_p8_s64 (int64x2_t)
* poly8x16_t vreinterpretq_p8_f32 (float32x4_t)
* poly8x16_t vreinterpretq_p8_p16 (poly16x8_t)
* poly16x4_t vreinterpret_p16_u32 (uint32x2_t)
* poly16x4_t vreinterpret_p16_u16 (uint16x4_t)
* poly16x4_t vreinterpret_p16_u8 (uint8x8_t)
* poly16x4_t vreinterpret_p16_s32 (int32x2_t)
* poly16x4_t vreinterpret_p16_s16 (int16x4_t)
* poly16x4_t vreinterpret_p16_s8 (int8x8_t)
* poly16x4_t vreinterpret_p16_u64 (uint64x1_t)
* poly16x4_t vreinterpret_p16_s64 (int64x1_t)
* poly16x4_t vreinterpret_p16_f32 (float32x2_t)
* poly16x4_t vreinterpret_p16_p8 (poly8x8_t)
* poly16x8_t vreinterpretq_p16_u32 (uint32x4_t)
* poly16x8_t vreinterpretq_p16_u16 (uint16x8_t)
* poly16x8_t vreinterpretq_p16_u8 (uint8x16_t)
* poly16x8_t vreinterpretq_p16_s32 (int32x4_t)
* poly16x8_t vreinterpretq_p16_s16 (int16x8_t)
* poly16x8_t vreinterpretq_p16_s8 (int8x16_t)
* poly16x8_t vreinterpretq_p16_u64 (uint64x2_t)
* poly16x8_t vreinterpretq_p16_s64 (int64x2_t)
* poly16x8_t vreinterpretq_p16_f32 (float32x4_t)
* poly16x8_t vreinterpretq_p16_p8 (poly8x16_t)
* float32x2_t vreinterpret_f32_u32 (uint32x2_t)
* float32x2_t vreinterpret_f32_u16 (uint16x4_t)
* float32x2_t vreinterpret_f32_u8 (uint8x8_t)
* float32x2_t vreinterpret_f32_s32 (int32x2_t)
* float32x2_t vreinterpret_f32_s16 (int16x4_t)
* float32x2_t vreinterpret_f32_s8 (int8x8_t)
* float32x2_t vreinterpret_f32_u64 (uint64x1_t)
* float32x2_t vreinterpret_f32_s64 (int64x1_t)
* float32x2_t vreinterpret_f32_p16 (poly16x4_t)
* float32x2_t vreinterpret_f32_p8 (poly8x8_t)
* float32x4_t vreinterpretq_f32_u32 (uint32x4_t)
* float32x4_t vreinterpretq_f32_u16 (uint16x8_t)
* float32x4_t vreinterpretq_f32_u8 (uint8x16_t)
* float32x4_t vreinterpretq_f32_s32 (int32x4_t)
* float32x4_t vreinterpretq_f32_s16 (int16x8_t)
* float32x4_t vreinterpretq_f32_s8 (int8x16_t)
* float32x4_t vreinterpretq_f32_u64 (uint64x2_t)
* float32x4_t vreinterpretq_f32_s64 (int64x2_t)
* float32x4_t vreinterpretq_f32_p16 (poly16x8_t)
* float32x4_t vreinterpretq_f32_p8 (poly8x16_t)
* int64x1_t vreinterpret_s64_u32 (uint32x2_t)
* int64x1_t vreinterpret_s64_u16 (uint16x4_t)
* int64x1_t vreinterpret_s64_u8 (uint8x8_t)
* int64x1_t vreinterpret_s64_s32 (int32x2_t)
* int64x1_t vreinterpret_s64_s16 (int16x4_t)
* int64x1_t vreinterpret_s64_s8 (int8x8_t)
* int64x1_t vreinterpret_s64_u64 (uint64x1_t)
* int64x1_t vreinterpret_s64_f32 (float32x2_t)
* int64x1_t vreinterpret_s64_p16 (poly16x4_t)
* int64x1_t vreinterpret_s64_p8 (poly8x8_t)
* int64x2_t vreinterpretq_s64_u32 (uint32x4_t)
* int64x2_t vreinterpretq_s64_u16 (uint16x8_t)
* int64x2_t vreinterpretq_s64_u8 (uint8x16_t)
* int64x2_t vreinterpretq_s64_s32 (int32x4_t)
* int64x2_t vreinterpretq_s64_s16 (int16x8_t)
* int64x2_t vreinterpretq_s64_s8 (int8x16_t)
* int64x2_t vreinterpretq_s64_u64 (uint64x2_t)
* int64x2_t vreinterpretq_s64_f32 (float32x4_t)
* int64x2_t vreinterpretq_s64_p16 (poly16x8_t)
* int64x2_t vreinterpretq_s64_p8 (poly8x16_t)
* uint64x1_t vreinterpret_u64_u32 (uint32x2_t)
* uint64x1_t vreinterpret_u64_u16 (uint16x4_t)
* uint64x1_t vreinterpret_u64_u8 (uint8x8_t)
* uint64x1_t vreinterpret_u64_s32 (int32x2_t)
* uint64x1_t vreinterpret_u64_s16 (int16x4_t)
* uint64x1_t vreinterpret_u64_s8 (int8x8_t)
* uint64x1_t vreinterpret_u64_s64 (int64x1_t)
* uint64x1_t vreinterpret_u64_f32 (float32x2_t)
* uint64x1_t vreinterpret_u64_p16 (poly16x4_t)
* uint64x1_t vreinterpret_u64_p8 (poly8x8_t)
* uint64x2_t vreinterpretq_u64_u32 (uint32x4_t)
* uint64x2_t vreinterpretq_u64_u16 (uint16x8_t)
* uint64x2_t vreinterpretq_u64_u8 (uint8x16_t)
* uint64x2_t vreinterpretq_u64_s32 (int32x4_t)
* uint64x2_t vreinterpretq_u64_s16 (int16x8_t)
* uint64x2_t vreinterpretq_u64_s8 (int8x16_t)
* uint64x2_t vreinterpretq_u64_s64 (int64x2_t)
* uint64x2_t vreinterpretq_u64_f32 (float32x4_t)
* uint64x2_t vreinterpretq_u64_p16 (poly16x8_t)
* uint64x2_t vreinterpretq_u64_p8 (poly8x16_t)
* int8x8_t vreinterpret_s8_u32 (uint32x2_t)
* int8x8_t vreinterpret_s8_u16 (uint16x4_t)
* int8x8_t vreinterpret_s8_u8 (uint8x8_t)
* int8x8_t vreinterpret_s8_s32 (int32x2_t)
* int8x8_t vreinterpret_s8_s16 (int16x4_t)
* int8x8_t vreinterpret_s8_u64 (uint64x1_t)
* int8x8_t vreinterpret_s8_s64 (int64x1_t)
* int8x8_t vreinterpret_s8_f32 (float32x2_t)
* int8x8_t vreinterpret_s8_p16 (poly16x4_t)
* int8x8_t vreinterpret_s8_p8 (poly8x8_t)
* int8x16_t vreinterpretq_s8_u32 (uint32x4_t)
* int8x16_t vreinterpretq_s8_u16 (uint16x8_t)
* int8x16_t vreinterpretq_s8_u8 (uint8x16_t)
* int8x16_t vreinterpretq_s8_s32 (int32x4_t)
* int8x16_t vreinterpretq_s8_s16 (int16x8_t)
* int8x16_t vreinterpretq_s8_u64 (uint64x2_t)
* int8x16_t vreinterpretq_s8_s64 (int64x2_t)
* int8x16_t vreinterpretq_s8_f32 (float32x4_t)
* int8x16_t vreinterpretq_s8_p16 (poly16x8_t)
* int8x16_t vreinterpretq_s8_p8 (poly8x16_t)
* int16x4_t vreinterpret_s16_u32 (uint32x2_t)
* int16x4_t vreinterpret_s16_u16 (uint16x4_t)
* int16x4_t vreinterpret_s16_u8 (uint8x8_t)
* int16x4_t vreinterpret_s16_s32 (int32x2_t)
* int16x4_t vreinterpret_s16_s8 (int8x8_t)
* int16x4_t vreinterpret_s16_u64 (uint64x1_t)
* int16x4_t vreinterpret_s16_s64 (int64x1_t)
* int16x4_t vreinterpret_s16_f32 (float32x2_t)
* int16x4_t vreinterpret_s16_p16 (poly16x4_t)
* int16x4_t vreinterpret_s16_p8 (poly8x8_t)
* int16x8_t vreinterpretq_s16_u32 (uint32x4_t)
* int16x8_t vreinterpretq_s16_u16 (uint16x8_t)
* int16x8_t vreinterpretq_s16_u8 (uint8x16_t)
* int16x8_t vreinterpretq_s16_s32 (int32x4_t)
* int16x8_t vreinterpretq_s16_s8 (int8x16_t)
* int16x8_t vreinterpretq_s16_u64 (uint64x2_t)
* int16x8_t vreinterpretq_s16_s64 (int64x2_t)
* int16x8_t vreinterpretq_s16_f32 (float32x4_t)
* int16x8_t vreinterpretq_s16_p16 (poly16x8_t)
* int16x8_t vreinterpretq_s16_p8 (poly8x16_t)
* int32x2_t vreinterpret_s32_u32 (uint32x2_t)
* int32x2_t vreinterpret_s32_u16 (uint16x4_t)
* int32x2_t vreinterpret_s32_u8 (uint8x8_t)
* int32x2_t vreinterpret_s32_s16 (int16x4_t)
* int32x2_t vreinterpret_s32_s8 (int8x8_t)
* int32x2_t vreinterpret_s32_u64 (uint64x1_t)
* int32x2_t vreinterpret_s32_s64 (int64x1_t)
* int32x2_t vreinterpret_s32_f32 (float32x2_t)
* int32x2_t vreinterpret_s32_p16 (poly16x4_t)
* int32x2_t vreinterpret_s32_p8 (poly8x8_t)
* int32x4_t vreinterpretq_s32_u32 (uint32x4_t)
* int32x4_t vreinterpretq_s32_u16 (uint16x8_t)
* int32x4_t vreinterpretq_s32_u8 (uint8x16_t)
* int32x4_t vreinterpretq_s32_s16 (int16x8_t)
* int32x4_t vreinterpretq_s32_s8 (int8x16_t)
* int32x4_t vreinterpretq_s32_u64 (uint64x2_t)
* int32x4_t vreinterpretq_s32_s64 (int64x2_t)
* int32x4_t vreinterpretq_s32_f32 (float32x4_t)
* int32x4_t vreinterpretq_s32_p16 (poly16x8_t)
* int32x4_t vreinterpretq_s32_p8 (poly8x16_t)
* uint8x8_t vreinterpret_u8_u32 (uint32x2_t)
* uint8x8_t vreinterpret_u8_u16 (uint16x4_t)
* uint8x8_t vreinterpret_u8_s32 (int32x2_t)
* uint8x8_t vreinterpret_u8_s16 (int16x4_t)
* uint8x8_t vreinterpret_u8_s8 (int8x8_t)
* uint8x8_t vreinterpret_u8_u64 (uint64x1_t)
* uint8x8_t vreinterpret_u8_s64 (int64x1_t)
* uint8x8_t vreinterpret_u8_f32 (float32x2_t)
* uint8x8_t vreinterpret_u8_p16 (poly16x4_t)
* uint8x8_t vreinterpret_u8_p8 (poly8x8_t)
* uint8x16_t vreinterpretq_u8_u32 (uint32x4_t)
* uint8x16_t vreinterpretq_u8_u16 (uint16x8_t)
* uint8x16_t vreinterpretq_u8_s32 (int32x4_t)
* uint8x16_t vreinterpretq_u8_s16 (int16x8_t)
* uint8x16_t vreinterpretq_u8_s8 (int8x16_t)
* uint8x16_t vreinterpretq_u8_u64 (uint64x2_t)
* uint8x16_t vreinterpretq_u8_s64 (int64x2_t)
* uint8x16_t vreinterpretq_u8_f32 (float32x4_t)
* uint8x16_t vreinterpretq_u8_p16 (poly16x8_t)
* uint8x16_t vreinterpretq_u8_p8 (poly8x16_t)
* uint16x4_t vreinterpret_u16_u32 (uint32x2_t)
* uint16x4_t vreinterpret_u16_u8 (uint8x8_t)
* uint16x4_t vreinterpret_u16_s32 (int32x2_t)
* uint16x4_t vreinterpret_u16_s16 (int16x4_t)
* uint16x4_t vreinterpret_u16_s8 (int8x8_t)
* uint16x4_t vreinterpret_u16_u64 (uint64x1_t)
* uint16x4_t vreinterpret_u16_s64 (int64x1_t)
* uint16x4_t vreinterpret_u16_f32 (float32x2_t)
* uint16x4_t vreinterpret_u16_p16 (poly16x4_t)
* uint16x4_t vreinterpret_u16_p8 (poly8x8_t)
* uint16x8_t vreinterpretq_u16_u32 (uint32x4_t)
* uint16x8_t vreinterpretq_u16_u8 (uint8x16_t)
* uint16x8_t vreinterpretq_u16_s32 (int32x4_t)
* uint16x8_t vreinterpretq_u16_s16 (int16x8_t)
* uint16x8_t vreinterpretq_u16_s8 (int8x16_t)
* uint16x8_t vreinterpretq_u16_u64 (uint64x2_t)
* uint16x8_t vreinterpretq_u16_s64 (int64x2_t)
* uint16x8_t vreinterpretq_u16_f32 (float32x4_t)
* uint16x8_t vreinterpretq_u16_p16 (poly16x8_t)
* uint16x8_t vreinterpretq_u16_p8 (poly8x16_t)
* uint32x2_t vreinterpret_u32_u16 (uint16x4_t)
* uint32x2_t vreinterpret_u32_u8 (uint8x8_t)
* uint32x2_t vreinterpret_u32_s32 (int32x2_t)
* uint32x2_t vreinterpret_u32_s16 (int16x4_t)
* uint32x2_t vreinterpret_u32_s8 (int8x8_t)
* uint32x2_t vreinterpret_u32_u64 (uint64x1_t)
* uint32x2_t vreinterpret_u32_s64 (int64x1_t)
* uint32x2_t vreinterpret_u32_f32 (float32x2_t)
* uint32x2_t vreinterpret_u32_p16 (poly16x4_t)
* uint32x2_t vreinterpret_u32_p8 (poly8x8_t)
* uint32x4_t vreinterpretq_u32_u16 (uint16x8_t)
* uint32x4_t vreinterpretq_u32_u8 (uint8x16_t)
* uint32x4_t vreinterpretq_u32_s32 (int32x4_t)
* uint32x4_t vreinterpretq_u32_s16 (int16x8_t)
* uint32x4_t vreinterpretq_u32_s8 (int8x16_t)
* uint32x4_t vreinterpretq_u32_u64 (uint64x2_t)
* uint32x4_t vreinterpretq_u32_s64 (int64x2_t)
* uint32x4_t vreinterpretq_u32_f32 (float32x4_t)
* uint32x4_t vreinterpretq_u32_p16 (poly16x8_t)
* uint32x4_t vreinterpretq_u32_p8 (poly8x16_t)

File: gcc.info, Node: Blackfin Built-in Functions, Next: FR-V Built-in Functions, Prev: ARM NEON Intrinsics, Up: Target Builtins
5.50.4 Blackfin Built-in Functions
----------------------------------
Currently, there are two Blackfin-specific built-in functions. These
are used for generating 'CSYNC' and 'SSYNC' machine insns without using
inline assembly; by using these built-in functions the compiler can
automatically add workarounds for hardware errata involving these
instructions. These functions are named as follows:
void __builtin_bfin_csync (void)
void __builtin_bfin_ssync (void)

File: gcc.info, Node: FR-V Built-in Functions, Next: X86 Built-in Functions, Prev: Blackfin Built-in Functions, Up: Target Builtins
5.50.5 FR-V Built-in Functions
------------------------------
GCC provides many FR-V-specific built-in functions. In general, these
functions are intended to be compatible with those described by 'FR-V
Family, Softune C/C++ Compiler Manual (V6), Fujitsu Semiconductor'. The
two exceptions are '__MDUNPACKH' and '__MBTOHE', the gcc forms of which
pass 128-bit values by pointer rather than by value.
Most of the functions are named after specific FR-V instructions. Such
functions are said to be "directly mapped" and are summarized here in
tabular form.
* Menu:
* Argument Types::
* Directly-mapped Integer Functions::
* Directly-mapped Media Functions::
* Raw read/write Functions::
* Other Built-in Functions::

File: gcc.info, Node: Argument Types, Next: Directly-mapped Integer Functions, Up: FR-V Built-in Functions
5.50.5.1 Argument Types
.......................
The arguments to the built-in functions can be divided into three
groups: register numbers, compile-time constants and run-time values.
In order to make this classification clear at a glance, the arguments
and return values are given the following pseudo types:
Pseudo type Real C type Constant? Description
'uh' 'unsigned short' No an unsigned halfword
'uw1' 'unsigned int' No an unsigned word
'sw1' 'int' No a signed word
'uw2' 'unsigned long long' No an unsigned doubleword
'sw2' 'long long' No a signed doubleword
'const' 'int' Yes an integer constant
'acc' 'int' Yes an ACC register number
'iacc' 'int' Yes an IACC register number
These pseudo types are not defined by GCC, they are simply a notational
convenience used in this manual.
Arguments of type 'uh', 'uw1', 'sw1', 'uw2' and 'sw2' are evaluated at
run time. They correspond to register operands in the underlying FR-V
instructions.
'const' arguments represent immediate operands in the underlying FR-V
instructions. They must be compile-time constants.
'acc' arguments are evaluated at compile time and specify the number of
an accumulator register. For example, an 'acc' argument of 2 will
select the ACC2 register.
'iacc' arguments are similar to 'acc' arguments but specify the number
of an IACC register. See *note Other Built-in Functions:: for more
details.

File: gcc.info, Node: Directly-mapped Integer Functions, Next: Directly-mapped Media Functions, Prev: Argument Types, Up: FR-V Built-in Functions
5.50.5.2 Directly-mapped Integer Functions
..........................................
The functions listed below map directly to FR-V I-type instructions.
Function prototype Example usage Assembly output
'sw1 __ADDSS (sw1, sw1)' 'C = __ADDSS (A, B)' 'ADDSS A,B,C'
'sw1 __SCAN (sw1, sw1)' 'C = __SCAN (A, B)' 'SCAN A,B,C'
'sw1 __SCUTSS (sw1)' 'B = __SCUTSS (A)' 'SCUTSS A,B'
'sw1 __SLASS (sw1, sw1)' 'C = __SLASS (A, B)' 'SLASS A,B,C'
'void __SMASS (sw1, sw1)' '__SMASS (A, B)' 'SMASS A,B'
'void __SMSSS (sw1, sw1)' '__SMSSS (A, B)' 'SMSSS A,B'
'void __SMU (sw1, sw1)' '__SMU (A, B)' 'SMU A,B'
'sw2 __SMUL (sw1, sw1)' 'C = __SMUL (A, B)' 'SMUL A,B,C'
'sw1 __SUBSS (sw1, sw1)' 'C = __SUBSS (A, B)' 'SUBSS A,B,C'
'uw2 __UMUL (uw1, uw1)' 'C = __UMUL (A, B)' 'UMUL A,B,C'

File: gcc.info, Node: Directly-mapped Media Functions, Next: Raw read/write Functions, Prev: Directly-mapped Integer Functions, Up: FR-V Built-in Functions
5.50.5.3 Directly-mapped Media Functions
........................................
The functions listed below map directly to FR-V M-type instructions.
Function prototype Example usage Assembly output
'uw1 __MABSHS (sw1)' 'B = __MABSHS (A)' 'MABSHS A,B'
'void __MADDACCS (acc, acc)' '__MADDACCS (B, A)' 'MADDACCS A,B'
'sw1 __MADDHSS (sw1, sw1)' 'C = __MADDHSS (A, 'MADDHSS A,B,C'
B)'
'uw1 __MADDHUS (uw1, uw1)' 'C = __MADDHUS (A, 'MADDHUS A,B,C'
B)'
'uw1 __MAND (uw1, uw1)' 'C = __MAND (A, B)' 'MAND A,B,C'
'void __MASACCS (acc, acc)' '__MASACCS (B, A)' 'MASACCS A,B'
'uw1 __MAVEH (uw1, uw1)' 'C = __MAVEH (A, B)' 'MAVEH A,B,C'
'uw2 __MBTOH (uw1)' 'B = __MBTOH (A)' 'MBTOH A,B'
'void __MBTOHE (uw1 *, uw1)' '__MBTOHE (&B, A)' 'MBTOHE A,B'
'void __MCLRACC (acc)' '__MCLRACC (A)' 'MCLRACC A'
'void __MCLRACCA (void)' '__MCLRACCA ()' 'MCLRACCA'
'uw1 __Mcop1 (uw1, uw1)' 'C = __Mcop1 (A, B)' 'Mcop1 A,B,C'
'uw1 __Mcop2 (uw1, uw1)' 'C = __Mcop2 (A, B)' 'Mcop2 A,B,C'
'uw1 __MCPLHI (uw2, const)' 'C = __MCPLHI (A, B)' 'MCPLHI A,#B,C'
'uw1 __MCPLI (uw2, const)' 'C = __MCPLI (A, B)' 'MCPLI A,#B,C'
'void __MCPXIS (acc, sw1, '__MCPXIS (C, A, B)' 'MCPXIS A,B,C'
sw1)'
'void __MCPXIU (acc, uw1, '__MCPXIU (C, A, B)' 'MCPXIU A,B,C'
uw1)'
'void __MCPXRS (acc, sw1, '__MCPXRS (C, A, B)' 'MCPXRS A,B,C'
sw1)'
'void __MCPXRU (acc, uw1, '__MCPXRU (C, A, B)' 'MCPXRU A,B,C'
uw1)'
'uw1 __MCUT (acc, uw1)' 'C = __MCUT (A, B)' 'MCUT A,B,C'
'uw1 __MCUTSS (acc, sw1)' 'C = __MCUTSS (A, B)' 'MCUTSS A,B,C'
'void __MDADDACCS (acc, acc)' '__MDADDACCS (B, A)' 'MDADDACCS A,B'
'void __MDASACCS (acc, acc)' '__MDASACCS (B, A)' 'MDASACCS A,B'
'uw2 __MDCUTSSI (acc, const)' 'C = __MDCUTSSI (A, 'MDCUTSSI
B)' A,#B,C'
'uw2 __MDPACKH (uw2, uw2)' 'C = __MDPACKH (A, 'MDPACKH A,B,C'
B)'
'uw2 __MDROTLI (uw2, const)' 'C = __MDROTLI (A, 'MDROTLI
B)' A,#B,C'
'void __MDSUBACCS (acc, acc)' '__MDSUBACCS (B, A)' 'MDSUBACCS A,B'
'void __MDUNPACKH (uw1 *, '__MDUNPACKH (&B, A)' 'MDUNPACKH A,B'
uw2)'
'uw2 __MEXPDHD (uw1, const)' 'C = __MEXPDHD (A, 'MEXPDHD
B)' A,#B,C'
'uw1 __MEXPDHW (uw1, const)' 'C = __MEXPDHW (A, 'MEXPDHW
B)' A,#B,C'
'uw1 __MHDSETH (uw1, const)' 'C = __MHDSETH (A, 'MHDSETH
B)' A,#B,C'
'sw1 __MHDSETS (const)' 'B = __MHDSETS (A)' 'MHDSETS #A,B'
'uw1 __MHSETHIH (uw1, const)' 'B = __MHSETHIH (B, 'MHSETHIH #A,B'
A)'
'sw1 __MHSETHIS (sw1, const)' 'B = __MHSETHIS (B, 'MHSETHIS #A,B'
A)'
'uw1 __MHSETLOH (uw1, const)' 'B = __MHSETLOH (B, 'MHSETLOH #A,B'
A)'
'sw1 __MHSETLOS (sw1, const)' 'B = __MHSETLOS (B, 'MHSETLOS #A,B'
A)'
'uw1 __MHTOB (uw2)' 'B = __MHTOB (A)' 'MHTOB A,B'
'void __MMACHS (acc, sw1, '__MMACHS (C, A, B)' 'MMACHS A,B,C'
sw1)'
'void __MMACHU (acc, uw1, '__MMACHU (C, A, B)' 'MMACHU A,B,C'
uw1)'
'void __MMRDHS (acc, sw1, '__MMRDHS (C, A, B)' 'MMRDHS A,B,C'
sw1)'
'void __MMRDHU (acc, uw1, '__MMRDHU (C, A, B)' 'MMRDHU A,B,C'
uw1)'
'void __MMULHS (acc, sw1, '__MMULHS (C, A, B)' 'MMULHS A,B,C'
sw1)'
'void __MMULHU (acc, uw1, '__MMULHU (C, A, B)' 'MMULHU A,B,C'
uw1)'
'void __MMULXHS (acc, sw1, '__MMULXHS (C, A, B)' 'MMULXHS A,B,C'
sw1)'
'void __MMULXHU (acc, uw1, '__MMULXHU (C, A, B)' 'MMULXHU A,B,C'
uw1)'
'uw1 __MNOT (uw1)' 'B = __MNOT (A)' 'MNOT A,B'
'uw1 __MOR (uw1, uw1)' 'C = __MOR (A, B)' 'MOR A,B,C'
'uw1 __MPACKH (uh, uh)' 'C = __MPACKH (A, B)' 'MPACKH A,B,C'
'sw2 __MQADDHSS (sw2, sw2)' 'C = __MQADDHSS (A, 'MQADDHSS
B)' A,B,C'
'uw2 __MQADDHUS (uw2, uw2)' 'C = __MQADDHUS (A, 'MQADDHUS
B)' A,B,C'
'void __MQCPXIS (acc, sw2, '__MQCPXIS (C, A, B)' 'MQCPXIS A,B,C'
sw2)'
'void __MQCPXIU (acc, uw2, '__MQCPXIU (C, A, B)' 'MQCPXIU A,B,C'
uw2)'
'void __MQCPXRS (acc, sw2, '__MQCPXRS (C, A, B)' 'MQCPXRS A,B,C'
sw2)'
'void __MQCPXRU (acc, uw2, '__MQCPXRU (C, A, B)' 'MQCPXRU A,B,C'
uw2)'
'sw2 __MQLCLRHS (sw2, sw2)' 'C = __MQLCLRHS (A, 'MQLCLRHS
B)' A,B,C'
'sw2 __MQLMTHS (sw2, sw2)' 'C = __MQLMTHS (A, 'MQLMTHS A,B,C'
B)'
'void __MQMACHS (acc, sw2, '__MQMACHS (C, A, B)' 'MQMACHS A,B,C'
sw2)'
'void __MQMACHU (acc, uw2, '__MQMACHU (C, A, B)' 'MQMACHU A,B,C'
uw2)'
'void __MQMACXHS (acc, sw2, '__MQMACXHS (C, A, 'MQMACXHS
sw2)' B)' A,B,C'
'void __MQMULHS (acc, sw2, '__MQMULHS (C, A, B)' 'MQMULHS A,B,C'
sw2)'
'void __MQMULHU (acc, uw2, '__MQMULHU (C, A, B)' 'MQMULHU A,B,C'
uw2)'
'void __MQMULXHS (acc, sw2, '__MQMULXHS (C, A, 'MQMULXHS
sw2)' B)' A,B,C'
'void __MQMULXHU (acc, uw2, '__MQMULXHU (C, A, 'MQMULXHU
uw2)' B)' A,B,C'
'sw2 __MQSATHS (sw2, sw2)' 'C = __MQSATHS (A, 'MQSATHS A,B,C'
B)'
'uw2 __MQSLLHI (uw2, int)' 'C = __MQSLLHI (A, 'MQSLLHI A,B,C'
B)'
'sw2 __MQSRAHI (sw2, int)' 'C = __MQSRAHI (A, 'MQSRAHI A,B,C'
B)'
'sw2 __MQSUBHSS (sw2, sw2)' 'C = __MQSUBHSS (A, 'MQSUBHSS
B)' A,B,C'
'uw2 __MQSUBHUS (uw2, uw2)' 'C = __MQSUBHUS (A, 'MQSUBHUS
B)' A,B,C'
'void __MQXMACHS (acc, sw2, '__MQXMACHS (C, A, 'MQXMACHS
sw2)' B)' A,B,C'
'void __MQXMACXHS (acc, sw2, '__MQXMACXHS (C, A, 'MQXMACXHS
sw2)' B)' A,B,C'
'uw1 __MRDACC (acc)' 'B = __MRDACC (A)' 'MRDACC A,B'
'uw1 __MRDACCG (acc)' 'B = __MRDACCG (A)' 'MRDACCG A,B'
'uw1 __MROTLI (uw1, const)' 'C = __MROTLI (A, B)' 'MROTLI A,#B,C'
'uw1 __MROTRI (uw1, const)' 'C = __MROTRI (A, B)' 'MROTRI A,#B,C'
'sw1 __MSATHS (sw1, sw1)' 'C = __MSATHS (A, B)' 'MSATHS A,B,C'
'uw1 __MSATHU (uw1, uw1)' 'C = __MSATHU (A, B)' 'MSATHU A,B,C'
'uw1 __MSLLHI (uw1, const)' 'C = __MSLLHI (A, B)' 'MSLLHI A,#B,C'
'sw1 __MSRAHI (sw1, const)' 'C = __MSRAHI (A, B)' 'MSRAHI A,#B,C'
'uw1 __MSRLHI (uw1, const)' 'C = __MSRLHI (A, B)' 'MSRLHI A,#B,C'
'void __MSUBACCS (acc, acc)' '__MSUBACCS (B, A)' 'MSUBACCS A,B'
'sw1 __MSUBHSS (sw1, sw1)' 'C = __MSUBHSS (A, 'MSUBHSS A,B,C'
B)'
'uw1 __MSUBHUS (uw1, uw1)' 'C = __MSUBHUS (A, 'MSUBHUS A,B,C'
B)'
'void __MTRAP (void)' '__MTRAP ()' 'MTRAP'
'uw2 __MUNPACKH (uw1)' 'B = __MUNPACKH (A)' 'MUNPACKH A,B'
'uw1 __MWCUT (uw2, uw1)' 'C = __MWCUT (A, B)' 'MWCUT A,B,C'
'void __MWTACC (acc, uw1)' '__MWTACC (B, A)' 'MWTACC A,B'
'void __MWTACCG (acc, uw1)' '__MWTACCG (B, A)' 'MWTACCG A,B'
'uw1 __MXOR (uw1, uw1)' 'C = __MXOR (A, B)' 'MXOR A,B,C'

File: gcc.info, Node: Raw read/write Functions, Next: Other Built-in Functions, Prev: Directly-mapped Media Functions, Up: FR-V Built-in Functions
5.50.5.4 Raw read/write Functions
.................................
This sections describes built-in functions related to read and write
instructions to access memory. These functions generate 'membar'
instructions to flush the I/O load and stores where appropriate, as
described in Fujitsu's manual described above.
'unsigned char __builtin_read8 (void *DATA)'
'unsigned short __builtin_read16 (void *DATA)'
'unsigned long __builtin_read32 (void *DATA)'
'unsigned long long __builtin_read64 (void *DATA)'
'void __builtin_write8 (void *DATA, unsigned char DATUM)'
'void __builtin_write16 (void *DATA, unsigned short DATUM)'
'void __builtin_write32 (void *DATA, unsigned long DATUM)'
'void __builtin_write64 (void *DATA, unsigned long long DATUM)'

File: gcc.info, Node: Other Built-in Functions, Prev: Raw read/write Functions, Up: FR-V Built-in Functions
5.50.5.5 Other Built-in Functions
.................................
This section describes built-in functions that are not named after a
specific FR-V instruction.
'sw2 __IACCreadll (iacc REG)'
Return the full 64-bit value of IACC0. The REG argument is
reserved for future expansion and must be 0.
'sw1 __IACCreadl (iacc REG)'
Return the value of IACC0H if REG is 0 and IACC0L if REG is 1.
Other values of REG are rejected as invalid.
'void __IACCsetll (iacc REG, sw2 X)'
Set the full 64-bit value of IACC0 to X. The REG argument is
reserved for future expansion and must be 0.
'void __IACCsetl (iacc REG, sw1 X)'
Set IACC0H to X if REG is 0 and IACC0L to X if REG is 1. Other
values of REG are rejected as invalid.
'void __data_prefetch0 (const void *X)'
Use the 'dcpl' instruction to load the contents of address X into
the data cache.
'void __data_prefetch (const void *X)'
Use the 'nldub' instruction to load the contents of address X into
the data cache. The instruction will be issued in slot I1.

File: gcc.info, Node: X86 Built-in Functions, Next: MIPS DSP Built-in Functions, Prev: FR-V Built-in Functions, Up: Target Builtins
5.50.6 X86 Built-in Functions
-----------------------------
These built-in functions are available for the i386 and x86-64 family of
computers, depending on the command-line switches used.
Note that, if you specify command-line switches such as '-msse', the
compiler could use the extended instruction sets even if the built-ins
are not used explicitly in the program. For this reason, applications
which perform runtime CPU detection must compile separate files for each
supported architecture, using the appropriate flags. In particular, the
file containing the CPU detection code should be compiled without these
options.
The following machine modes are available for use with MMX built-in
functions (*note Vector Extensions::): 'V2SI' for a vector of two 32-bit
integers, 'V4HI' for a vector of four 16-bit integers, and 'V8QI' for a
vector of eight 8-bit integers. Some of the built-in functions operate
on MMX registers as a whole 64-bit entity, these use 'DI' as their mode.
If 3Dnow extensions are enabled, 'V2SF' is used as a mode for a vector
of two 32-bit floating point values.
If SSE extensions are enabled, 'V4SF' is used for a vector of four
32-bit floating point values. Some instructions use a vector of four
32-bit integers, these use 'V4SI'. Finally, some instructions operate
on an entire vector register, interpreting it as a 128-bit integer,
these use mode 'TI'.
In 64-bit mode, the x86-64 family of processors uses additional
built-in functions for efficient use of 'TF' ('__float128') 128-bit
floating point and 'TC' 128-bit complex floating point values.
The following floating point built-in functions are available in 64-bit
mode. All of them implement the function that is part of the name.
__float128 __builtin_fabsq (__float128)
__float128 __builtin_copysignq (__float128, __float128)
The following floating point built-in functions are made available in
the 64-bit mode.
'__float128 __builtin_infq (void)'
Similar to '__builtin_inf', except the return type is '__float128'.
The following built-in functions are made available by '-mmmx'. All of
them generate the machine instruction that is part of the name.
v8qi __builtin_ia32_paddb (v8qi, v8qi)
v4hi __builtin_ia32_paddw (v4hi, v4hi)
v2si __builtin_ia32_paddd (v2si, v2si)
v8qi __builtin_ia32_psubb (v8qi, v8qi)
v4hi __builtin_ia32_psubw (v4hi, v4hi)
v2si __builtin_ia32_psubd (v2si, v2si)
v8qi __builtin_ia32_paddsb (v8qi, v8qi)
v4hi __builtin_ia32_paddsw (v4hi, v4hi)
v8qi __builtin_ia32_psubsb (v8qi, v8qi)
v4hi __builtin_ia32_psubsw (v4hi, v4hi)
v8qi __builtin_ia32_paddusb (v8qi, v8qi)
v4hi __builtin_ia32_paddusw (v4hi, v4hi)
v8qi __builtin_ia32_psubusb (v8qi, v8qi)
v4hi __builtin_ia32_psubusw (v4hi, v4hi)
v4hi __builtin_ia32_pmullw (v4hi, v4hi)
v4hi __builtin_ia32_pmulhw (v4hi, v4hi)
di __builtin_ia32_pand (di, di)
di __builtin_ia32_pandn (di,di)
di __builtin_ia32_por (di, di)
di __builtin_ia32_pxor (di, di)
v8qi __builtin_ia32_pcmpeqb (v8qi, v8qi)
v4hi __builtin_ia32_pcmpeqw (v4hi, v4hi)
v2si __builtin_ia32_pcmpeqd (v2si, v2si)
v8qi __builtin_ia32_pcmpgtb (v8qi, v8qi)
v4hi __builtin_ia32_pcmpgtw (v4hi, v4hi)
v2si __builtin_ia32_pcmpgtd (v2si, v2si)
v8qi __builtin_ia32_punpckhbw (v8qi, v8qi)
v4hi __builtin_ia32_punpckhwd (v4hi, v4hi)
v2si __builtin_ia32_punpckhdq (v2si, v2si)
v8qi __builtin_ia32_punpcklbw (v8qi, v8qi)
v4hi __builtin_ia32_punpcklwd (v4hi, v4hi)
v2si __builtin_ia32_punpckldq (v2si, v2si)
v8qi __builtin_ia32_packsswb (v4hi, v4hi)
v4hi __builtin_ia32_packssdw (v2si, v2si)
v8qi __builtin_ia32_packuswb (v4hi, v4hi)
The following built-in functions are made available either with
'-msse', or with a combination of '-m3dnow' and '-march=athlon'. All of
them generate the machine instruction that is part of the name.
v4hi __builtin_ia32_pmulhuw (v4hi, v4hi)
v8qi __builtin_ia32_pavgb (v8qi, v8qi)
v4hi __builtin_ia32_pavgw (v4hi, v4hi)
v4hi __builtin_ia32_psadbw (v8qi, v8qi)
v8qi __builtin_ia32_pmaxub (v8qi, v8qi)
v4hi __builtin_ia32_pmaxsw (v4hi, v4hi)
v8qi __builtin_ia32_pminub (v8qi, v8qi)
v4hi __builtin_ia32_pminsw (v4hi, v4hi)
int __builtin_ia32_pextrw (v4hi, int)
v4hi __builtin_ia32_pinsrw (v4hi, int, int)
int __builtin_ia32_pmovmskb (v8qi)
void __builtin_ia32_maskmovq (v8qi, v8qi, char *)
void __builtin_ia32_movntq (di *, di)
void __builtin_ia32_sfence (void)
The following built-in functions are available when '-msse' is used.
All of them generate the machine instruction that is part of the name.
int __builtin_ia32_comieq (v4sf, v4sf)
int __builtin_ia32_comineq (v4sf, v4sf)
int __builtin_ia32_comilt (v4sf, v4sf)
int __builtin_ia32_comile (v4sf, v4sf)
int __builtin_ia32_comigt (v4sf, v4sf)
int __builtin_ia32_comige (v4sf, v4sf)
int __builtin_ia32_ucomieq (v4sf, v4sf)
int __builtin_ia32_ucomineq (v4sf, v4sf)
int __builtin_ia32_ucomilt (v4sf, v4sf)
int __builtin_ia32_ucomile (v4sf, v4sf)
int __builtin_ia32_ucomigt (v4sf, v4sf)
int __builtin_ia32_ucomige (v4sf, v4sf)
v4sf __builtin_ia32_addps (v4sf, v4sf)
v4sf __builtin_ia32_subps (v4sf, v4sf)
v4sf __builtin_ia32_mulps (v4sf, v4sf)
v4sf __builtin_ia32_divps (v4sf, v4sf)
v4sf __builtin_ia32_addss (v4sf, v4sf)
v4sf __builtin_ia32_subss (v4sf, v4sf)
v4sf __builtin_ia32_mulss (v4sf, v4sf)
v4sf __builtin_ia32_divss (v4sf, v4sf)
v4si __builtin_ia32_cmpeqps (v4sf, v4sf)
v4si __builtin_ia32_cmpltps (v4sf, v4sf)
v4si __builtin_ia32_cmpleps (v4sf, v4sf)
v4si __builtin_ia32_cmpgtps (v4sf, v4sf)
v4si __builtin_ia32_cmpgeps (v4sf, v4sf)
v4si __builtin_ia32_cmpunordps (v4sf, v4sf)
v4si __builtin_ia32_cmpneqps (v4sf, v4sf)
v4si __builtin_ia32_cmpnltps (v4sf, v4sf)
v4si __builtin_ia32_cmpnleps (v4sf, v4sf)
v4si __builtin_ia32_cmpngtps (v4sf, v4sf)
v4si __builtin_ia32_cmpngeps (v4sf, v4sf)
v4si __builtin_ia32_cmpordps (v4sf, v4sf)
v4si __builtin_ia32_cmpeqss (v4sf, v4sf)
v4si __builtin_ia32_cmpltss (v4sf, v4sf)
v4si __builtin_ia32_cmpless (v4sf, v4sf)
v4si __builtin_ia32_cmpunordss (v4sf, v4sf)
v4si __builtin_ia32_cmpneqss (v4sf, v4sf)
v4si __builtin_ia32_cmpnlts (v4sf, v4sf)
v4si __builtin_ia32_cmpnless (v4sf, v4sf)
v4si __builtin_ia32_cmpordss (v4sf, v4sf)
v4sf __builtin_ia32_maxps (v4sf, v4sf)
v4sf __builtin_ia32_maxss (v4sf, v4sf)
v4sf __builtin_ia32_minps (v4sf, v4sf)
v4sf __builtin_ia32_minss (v4sf, v4sf)
v4sf __builtin_ia32_andps (v4sf, v4sf)
v4sf __builtin_ia32_andnps (v4sf, v4sf)
v4sf __builtin_ia32_orps (v4sf, v4sf)
v4sf __builtin_ia32_xorps (v4sf, v4sf)
v4sf __builtin_ia32_movss (v4sf, v4sf)
v4sf __builtin_ia32_movhlps (v4sf, v4sf)
v4sf __builtin_ia32_movlhps (v4sf, v4sf)
v4sf __builtin_ia32_unpckhps (v4sf, v4sf)
v4sf __builtin_ia32_unpcklps (v4sf, v4sf)
v4sf __builtin_ia32_cvtpi2ps (v4sf, v2si)
v4sf __builtin_ia32_cvtsi2ss (v4sf, int)
v2si __builtin_ia32_cvtps2pi (v4sf)
int __builtin_ia32_cvtss2si (v4sf)
v2si __builtin_ia32_cvttps2pi (v4sf)
int __builtin_ia32_cvttss2si (v4sf)
v4sf __builtin_ia32_rcpps (v4sf)
v4sf __builtin_ia32_rsqrtps (v4sf)
v4sf __builtin_ia32_sqrtps (v4sf)
v4sf __builtin_ia32_rcpss (v4sf)
v4sf __builtin_ia32_rsqrtss (v4sf)
v4sf __builtin_ia32_sqrtss (v4sf)
v4sf __builtin_ia32_shufps (v4sf, v4sf, int)
void __builtin_ia32_movntps (float *, v4sf)
int __builtin_ia32_movmskps (v4sf)
The following built-in functions are available when '-msse' is used.
'v4sf __builtin_ia32_loadaps (float *)'
Generates the 'movaps' machine instruction as a load from memory.
'void __builtin_ia32_storeaps (float *, v4sf)'
Generates the 'movaps' machine instruction as a store to memory.
'v4sf __builtin_ia32_loadups (float *)'
Generates the 'movups' machine instruction as a load from memory.
'void __builtin_ia32_storeups (float *, v4sf)'
Generates the 'movups' machine instruction as a store to memory.
'v4sf __builtin_ia32_loadsss (float *)'
Generates the 'movss' machine instruction as a load from memory.
'void __builtin_ia32_storess (float *, v4sf)'
Generates the 'movss' machine instruction as a store to memory.
'v4sf __builtin_ia32_loadhps (v4sf, v2si *)'
Generates the 'movhps' machine instruction as a load from memory.
'v4sf __builtin_ia32_loadlps (v4sf, v2si *)'
Generates the 'movlps' machine instruction as a load from memory
'void __builtin_ia32_storehps (v4sf, v2si *)'
Generates the 'movhps' machine instruction as a store to memory.
'void __builtin_ia32_storelps (v4sf, v2si *)'
Generates the 'movlps' machine instruction as a store to memory.
The following built-in functions are available when '-msse2' is used.
All of them generate the machine instruction that is part of the name.
int __builtin_ia32_comisdeq (v2df, v2df)
int __builtin_ia32_comisdlt (v2df, v2df)
int __builtin_ia32_comisdle (v2df, v2df)
int __builtin_ia32_comisdgt (v2df, v2df)
int __builtin_ia32_comisdge (v2df, v2df)
int __builtin_ia32_comisdneq (v2df, v2df)
int __builtin_ia32_ucomisdeq (v2df, v2df)
int __builtin_ia32_ucomisdlt (v2df, v2df)
int __builtin_ia32_ucomisdle (v2df, v2df)
int __builtin_ia32_ucomisdgt (v2df, v2df)
int __builtin_ia32_ucomisdge (v2df, v2df)
int __builtin_ia32_ucomisdneq (v2df, v2df)
v2df __builtin_ia32_cmpeqpd (v2df, v2df)
v2df __builtin_ia32_cmpltpd (v2df, v2df)
v2df __builtin_ia32_cmplepd (v2df, v2df)
v2df __builtin_ia32_cmpgtpd (v2df, v2df)
v2df __builtin_ia32_cmpgepd (v2df, v2df)
v2df __builtin_ia32_cmpunordpd (v2df, v2df)
v2df __builtin_ia32_cmpneqpd (v2df, v2df)
v2df __builtin_ia32_cmpnltpd (v2df, v2df)
v2df __builtin_ia32_cmpnlepd (v2df, v2df)
v2df __builtin_ia32_cmpngtpd (v2df, v2df)
v2df __builtin_ia32_cmpngepd (v2df, v2df)
v2df __builtin_ia32_cmpordpd (v2df, v2df)
v2df __builtin_ia32_cmpeqsd (v2df, v2df)
v2df __builtin_ia32_cmpltsd (v2df, v2df)
v2df __builtin_ia32_cmplesd (v2df, v2df)
v2df __builtin_ia32_cmpunordsd (v2df, v2df)
v2df __builtin_ia32_cmpneqsd (v2df, v2df)
v2df __builtin_ia32_cmpnltsd (v2df, v2df)
v2df __builtin_ia32_cmpnlesd (v2df, v2df)
v2df __builtin_ia32_cmpordsd (v2df, v2df)
v2di __builtin_ia32_paddq (v2di, v2di)
v2di __builtin_ia32_psubq (v2di, v2di)
v2df __builtin_ia32_addpd (v2df, v2df)
v2df __builtin_ia32_subpd (v2df, v2df)
v2df __builtin_ia32_mulpd (v2df, v2df)
v2df __builtin_ia32_divpd (v2df, v2df)
v2df __builtin_ia32_addsd (v2df, v2df)
v2df __builtin_ia32_subsd (v2df, v2df)
v2df __builtin_ia32_mulsd (v2df, v2df)
v2df __builtin_ia32_divsd (v2df, v2df)
v2df __builtin_ia32_minpd (v2df, v2df)
v2df __builtin_ia32_maxpd (v2df, v2df)
v2df __builtin_ia32_minsd (v2df, v2df)
v2df __builtin_ia32_maxsd (v2df, v2df)
v2df __builtin_ia32_andpd (v2df, v2df)
v2df __builtin_ia32_andnpd (v2df, v2df)
v2df __builtin_ia32_orpd (v2df, v2df)
v2df __builtin_ia32_xorpd (v2df, v2df)
v2df __builtin_ia32_movsd (v2df, v2df)
v2df __builtin_ia32_unpckhpd (v2df, v2df)
v2df __builtin_ia32_unpcklpd (v2df, v2df)
v16qi __builtin_ia32_paddb128 (v16qi, v16qi)
v8hi __builtin_ia32_paddw128 (v8hi, v8hi)
v4si __builtin_ia32_paddd128 (v4si, v4si)
v2di __builtin_ia32_paddq128 (v2di, v2di)
v16qi __builtin_ia32_psubb128 (v16qi, v16qi)
v8hi __builtin_ia32_psubw128 (v8hi, v8hi)
v4si __builtin_ia32_psubd128 (v4si, v4si)
v2di __builtin_ia32_psubq128 (v2di, v2di)
v8hi __builtin_ia32_pmullw128 (v8hi, v8hi)
v8hi __builtin_ia32_pmulhw128 (v8hi, v8hi)
v2di __builtin_ia32_pand128 (v2di, v2di)
v2di __builtin_ia32_pandn128 (v2di, v2di)
v2di __builtin_ia32_por128 (v2di, v2di)
v2di __builtin_ia32_pxor128 (v2di, v2di)
v16qi __builtin_ia32_pavgb128 (v16qi, v16qi)
v8hi __builtin_ia32_pavgw128 (v8hi, v8hi)
v16qi __builtin_ia32_pcmpeqb128 (v16qi, v16qi)
v8hi __builtin_ia32_pcmpeqw128 (v8hi, v8hi)
v4si __builtin_ia32_pcmpeqd128 (v4si, v4si)
v16qi __builtin_ia32_pcmpgtb128 (v16qi, v16qi)
v8hi __builtin_ia32_pcmpgtw128 (v8hi, v8hi)
v4si __builtin_ia32_pcmpgtd128 (v4si, v4si)
v16qi __builtin_ia32_pmaxub128 (v16qi, v16qi)
v8hi __builtin_ia32_pmaxsw128 (v8hi, v8hi)
v16qi __builtin_ia32_pminub128 (v16qi, v16qi)
v8hi __builtin_ia32_pminsw128 (v8hi, v8hi)
v16qi __builtin_ia32_punpckhbw128 (v16qi, v16qi)
v8hi __builtin_ia32_punpckhwd128 (v8hi, v8hi)
v4si __builtin_ia32_punpckhdq128 (v4si, v4si)
v2di __builtin_ia32_punpckhqdq128 (v2di, v2di)
v16qi __builtin_ia32_punpcklbw128 (v16qi, v16qi)
v8hi __builtin_ia32_punpcklwd128 (v8hi, v8hi)
v4si __builtin_ia32_punpckldq128 (v4si, v4si)
v2di __builtin_ia32_punpcklqdq128 (v2di, v2di)
v16qi __builtin_ia32_packsswb128 (v16qi, v16qi)
v8hi __builtin_ia32_packssdw128 (v8hi, v8hi)
v16qi __builtin_ia32_packuswb128 (v16qi, v16qi)
v8hi __builtin_ia32_pmulhuw128 (v8hi, v8hi)
void __builtin_ia32_maskmovdqu (v16qi, v16qi)
v2df __builtin_ia32_loadupd (double *)
void __builtin_ia32_storeupd (double *, v2df)
v2df __builtin_ia32_loadhpd (v2df, double *)
v2df __builtin_ia32_loadlpd (v2df, double *)
int __builtin_ia32_movmskpd (v2df)
int __builtin_ia32_pmovmskb128 (v16qi)
void __builtin_ia32_movnti (int *, int)
void __builtin_ia32_movntpd (double *, v2df)
void __builtin_ia32_movntdq (v2df *, v2df)
v4si __builtin_ia32_pshufd (v4si, int)
v8hi __builtin_ia32_pshuflw (v8hi, int)
v8hi __builtin_ia32_pshufhw (v8hi, int)
v2di __builtin_ia32_psadbw128 (v16qi, v16qi)
v2df __builtin_ia32_sqrtpd (v2df)
v2df __builtin_ia32_sqrtsd (v2df)
v2df __builtin_ia32_shufpd (v2df, v2df, int)
v2df __builtin_ia32_cvtdq2pd (v4si)
v4sf __builtin_ia32_cvtdq2ps (v4si)
v4si __builtin_ia32_cvtpd2dq (v2df)
v2si __builtin_ia32_cvtpd2pi (v2df)
v4sf __builtin_ia32_cvtpd2ps (v2df)
v4si __builtin_ia32_cvttpd2dq (v2df)
v2si __builtin_ia32_cvttpd2pi (v2df)
v2df __builtin_ia32_cvtpi2pd (v2si)
int __builtin_ia32_cvtsd2si (v2df)
int __builtin_ia32_cvttsd2si (v2df)
long long __builtin_ia32_cvtsd2si64 (v2df)
long long __builtin_ia32_cvttsd2si64 (v2df)
v4si __builtin_ia32_cvtps2dq (v4sf)
v2df __builtin_ia32_cvtps2pd (v4sf)
v4si __builtin_ia32_cvttps2dq (v4sf)
v2df __builtin_ia32_cvtsi2sd (v2df, int)
v2df __builtin_ia32_cvtsi642sd (v2df, long long)
v4sf __builtin_ia32_cvtsd2ss (v4sf, v2df)
v2df __builtin_ia32_cvtss2sd (v2df, v4sf)
void __builtin_ia32_clflush (const void *)
void __builtin_ia32_lfence (void)
void __builtin_ia32_mfence (void)
v16qi __builtin_ia32_loaddqu (const char *)
void __builtin_ia32_storedqu (char *, v16qi)
unsigned long long __builtin_ia32_pmuludq (v2si, v2si)
v2di __builtin_ia32_pmuludq128 (v4si, v4si)
v8hi __builtin_ia32_psllw128 (v8hi, v2di)
v4si __builtin_ia32_pslld128 (v4si, v2di)
v2di __builtin_ia32_psllq128 (v4si, v2di)
v8hi __builtin_ia32_psrlw128 (v8hi, v2di)
v4si __builtin_ia32_psrld128 (v4si, v2di)
v2di __builtin_ia32_psrlq128 (v2di, v2di)
v8hi __builtin_ia32_psraw128 (v8hi, v2di)
v4si __builtin_ia32_psrad128 (v4si, v2di)
v2di __builtin_ia32_pslldqi128 (v2di, int)
v8hi __builtin_ia32_psllwi128 (v8hi, int)
v4si __builtin_ia32_pslldi128 (v4si, int)
v2di __builtin_ia32_psllqi128 (v2di, int)
v2di __builtin_ia32_psrldqi128 (v2di, int)
v8hi __builtin_ia32_psrlwi128 (v8hi, int)
v4si __builtin_ia32_psrldi128 (v4si, int)
v2di __builtin_ia32_psrlqi128 (v2di, int)
v8hi __builtin_ia32_psrawi128 (v8hi, int)
v4si __builtin_ia32_psradi128 (v4si, int)
v4si __builtin_ia32_pmaddwd128 (v8hi, v8hi)
The following built-in functions are available when '-msse3' is used.
All of them generate the machine instruction that is part of the name.
v2df __builtin_ia32_addsubpd (v2df, v2df)
v4sf __builtin_ia32_addsubps (v4sf, v4sf)
v2df __builtin_ia32_haddpd (v2df, v2df)
v4sf __builtin_ia32_haddps (v4sf, v4sf)
v2df __builtin_ia32_hsubpd (v2df, v2df)
v4sf __builtin_ia32_hsubps (v4sf, v4sf)
v16qi __builtin_ia32_lddqu (char const *)
void __builtin_ia32_monitor (void *, unsigned int, unsigned int)
v2df __builtin_ia32_movddup (v2df)
v4sf __builtin_ia32_movshdup (v4sf)
v4sf __builtin_ia32_movsldup (v4sf)
void __builtin_ia32_mwait (unsigned int, unsigned int)
The following built-in functions are available when '-msse3' is used.
'v2df __builtin_ia32_loadddup (double const *)'
Generates the 'movddup' machine instruction as a load from memory.
The following built-in functions are available when '-mssse3' is used.
All of them generate the machine instruction that is part of the name
with MMX registers.
v2si __builtin_ia32_phaddd (v2si, v2si)
v4hi __builtin_ia32_phaddw (v4hi, v4hi)
v4hi __builtin_ia32_phaddsw (v4hi, v4hi)
v2si __builtin_ia32_phsubd (v2si, v2si)
v4hi __builtin_ia32_phsubw (v4hi, v4hi)
v4hi __builtin_ia32_phsubsw (v4hi, v4hi)
v8qi __builtin_ia32_pmaddubsw (v8qi, v8qi)
v4hi __builtin_ia32_pmulhrsw (v4hi, v4hi)
v8qi __builtin_ia32_pshufb (v8qi, v8qi)
v8qi __builtin_ia32_psignb (v8qi, v8qi)
v2si __builtin_ia32_psignd (v2si, v2si)
v4hi __builtin_ia32_psignw (v4hi, v4hi)
long long __builtin_ia32_palignr (long long, long long, int)
v8qi __builtin_ia32_pabsb (v8qi)
v2si __builtin_ia32_pabsd (v2si)
v4hi __builtin_ia32_pabsw (v4hi)
The following built-in functions are available when '-mssse3' is used.
All of them generate the machine instruction that is part of the name
with SSE registers.
v4si __builtin_ia32_phaddd128 (v4si, v4si)
v8hi __builtin_ia32_phaddw128 (v8hi, v8hi)
v8hi __builtin_ia32_phaddsw128 (v8hi, v8hi)
v4si __builtin_ia32_phsubd128 (v4si, v4si)
v8hi __builtin_ia32_phsubw128 (v8hi, v8hi)
v8hi __builtin_ia32_phsubsw128 (v8hi, v8hi)
v16qi __builtin_ia32_pmaddubsw128 (v16qi, v16qi)
v8hi __builtin_ia32_pmulhrsw128 (v8hi, v8hi)
v16qi __builtin_ia32_pshufb128 (v16qi, v16qi)
v16qi __builtin_ia32_psignb128 (v16qi, v16qi)
v4si __builtin_ia32_psignd128 (v4si, v4si)
v8hi __builtin_ia32_psignw128 (v8hi, v8hi)
v2di __builtin_ia32_palignr (v2di, v2di, int)
v16qi __builtin_ia32_pabsb128 (v16qi)
v4si __builtin_ia32_pabsd128 (v4si)
v8hi __builtin_ia32_pabsw128 (v8hi)
The following built-in functions are available when '-msse4.1' is used.
All of them generate the machine instruction that is part of the name.
v2df __builtin_ia32_blendpd (v2df, v2df, const int)
v4sf __builtin_ia32_blendps (v4sf, v4sf, const int)
v2df __builtin_ia32_blendvpd (v2df, v2df, v2df)
v4sf __builtin_ia32_blendvps (v4sf, v4sf, v4sf)
v2df __builtin_ia32_dppd (v2df, v2df, const int)
v4sf __builtin_ia32_dpps (v4sf, v4sf, const int)
v4sf __builtin_ia32_insertps128 (v4sf, v4sf, const int)
v2di __builtin_ia32_movntdqa (v2di *);
v16qi __builtin_ia32_mpsadbw128 (v16qi, v16qi, const int)
v8hi __builtin_ia32_packusdw128 (v4si, v4si)
v16qi __builtin_ia32_pblendvb128 (v16qi, v16qi, v16qi)
v8hi __builtin_ia32_pblendw128 (v8hi, v8hi, const int)
v2di __builtin_ia32_pcmpeqq (v2di, v2di)
v8hi __builtin_ia32_phminposuw128 (v8hi)
v16qi __builtin_ia32_pmaxsb128 (v16qi, v16qi)
v4si __builtin_ia32_pmaxsd128 (v4si, v4si)
v4si __builtin_ia32_pmaxud128 (v4si, v4si)
v8hi __builtin_ia32_pmaxuw128 (v8hi, v8hi)
v16qi __builtin_ia32_pminsb128 (v16qi, v16qi)
v4si __builtin_ia32_pminsd128 (v4si, v4si)
v4si __builtin_ia32_pminud128 (v4si, v4si)
v8hi __builtin_ia32_pminuw128 (v8hi, v8hi)
v4si __builtin_ia32_pmovsxbd128 (v16qi)
v2di __builtin_ia32_pmovsxbq128 (v16qi)
v8hi __builtin_ia32_pmovsxbw128 (v16qi)
v2di __builtin_ia32_pmovsxdq128 (v4si)
v4si __builtin_ia32_pmovsxwd128 (v8hi)
v2di __builtin_ia32_pmovsxwq128 (v8hi)
v4si __builtin_ia32_pmovzxbd128 (v16qi)
v2di __builtin_ia32_pmovzxbq128 (v16qi)
v8hi __builtin_ia32_pmovzxbw128 (v16qi)
v2di __builtin_ia32_pmovzxdq128 (v4si)
v4si __builtin_ia32_pmovzxwd128 (v8hi)
v2di __builtin_ia32_pmovzxwq128 (v8hi)
v2di __builtin_ia32_pmuldq128 (v4si, v4si)
v4si __builtin_ia32_pmulld128 (v4si, v4si)
int __builtin_ia32_ptestc128 (v2di, v2di)
int __builtin_ia32_ptestnzc128 (v2di, v2di)
int __builtin_ia32_ptestz128 (v2di, v2di)
v2df __builtin_ia32_roundpd (v2df, const int)
v4sf __builtin_ia32_roundps (v4sf, const int)
v2df __builtin_ia32_roundsd (v2df, v2df, const int)
v4sf __builtin_ia32_roundss (v4sf, v4sf, const int)
The following built-in functions are available when '-msse4.1' is used.
'v4sf __builtin_ia32_vec_set_v4sf (v4sf, float, const int)'
Generates the 'insertps' machine instruction.
'int __builtin_ia32_vec_ext_v16qi (v16qi, const int)'
Generates the 'pextrb' machine instruction.
'v16qi __builtin_ia32_vec_set_v16qi (v16qi, int, const int)'
Generates the 'pinsrb' machine instruction.
'v4si __builtin_ia32_vec_set_v4si (v4si, int, const int)'
Generates the 'pinsrd' machine instruction.
'v2di __builtin_ia32_vec_set_v2di (v2di, long long, const int)'
Generates the 'pinsrq' machine instruction in 64bit mode.
The following built-in functions are changed to generate new SSE4.1
instructions when '-msse4.1' is used.
'float __builtin_ia32_vec_ext_v4sf (v4sf, const int)'
Generates the 'extractps' machine instruction.
'int __builtin_ia32_vec_ext_v4si (v4si, const int)'
Generates the 'pextrd' machine instruction.
'long long __builtin_ia32_vec_ext_v2di (v2di, const int)'
Generates the 'pextrq' machine instruction in 64bit mode.
The following built-in functions are available when '-msse4.2' is used.
All of them generate the machine instruction that is part of the name.
v16qi __builtin_ia32_pcmpestrm128 (v16qi, int, v16qi, int, const int)
int __builtin_ia32_pcmpestri128 (v16qi, int, v16qi, int, const int)
int __builtin_ia32_pcmpestria128 (v16qi, int, v16qi, int, const int)
int __builtin_ia32_pcmpestric128 (v16qi, int, v16qi, int, const int)
int __builtin_ia32_pcmpestrio128 (v16qi, int, v16qi, int, const int)
int __builtin_ia32_pcmpestris128 (v16qi, int, v16qi, int, const int)
int __builtin_ia32_pcmpestriz128 (v16qi, int, v16qi, int, const int)
v16qi __builtin_ia32_pcmpistrm128 (v16qi, v16qi, const int)
int __builtin_ia32_pcmpistri128 (v16qi, v16qi, const int)
int __builtin_ia32_pcmpistria128 (v16qi, v16qi, const int)
int __builtin_ia32_pcmpistric128 (v16qi, v16qi, const int)
int __builtin_ia32_pcmpistrio128 (v16qi, v16qi, const int)
int __builtin_ia32_pcmpistris128 (v16qi, v16qi, const int)
int __builtin_ia32_pcmpistriz128 (v16qi, v16qi, const int)
v2di __builtin_ia32_pcmpgtq (v2di, v2di)
The following built-in functions are available when '-msse4.2' is used.
'unsigned int __builtin_ia32_crc32qi (unsigned int, unsigned char)'
Generates the 'crc32b' machine instruction.
'unsigned int __builtin_ia32_crc32hi (unsigned int, unsigned short)'
Generates the 'crc32w' machine instruction.
'unsigned int __builtin_ia32_crc32si (unsigned int, unsigned int)'
Generates the 'crc32l' machine instruction.
'unsigned long long __builtin_ia32_crc32di (unsigned long long, unsigned long long)'
The following built-in functions are changed to generate new SSE4.2
instructions when '-msse4.2' is used.
'int __builtin_popcount (unsigned int)'
Generates the 'popcntl' machine instruction.
'int __builtin_popcountl (unsigned long)'
Generates the 'popcntl' or 'popcntq' machine instruction, depending
on the size of 'unsigned long'.
'int __builtin_popcountll (unsigned long long)'
Generates the 'popcntq' machine instruction.
The following built-in functions are available when '-msse4a' is used.
All of them generate the machine instruction that is part of the name.
void __builtin_ia32_movntsd (double *, v2df)
void __builtin_ia32_movntss (float *, v4sf)
v2di __builtin_ia32_extrq (v2di, v16qi)
v2di __builtin_ia32_extrqi (v2di, const unsigned int, const unsigned int)
v2di __builtin_ia32_insertq (v2di, v2di)
v2di __builtin_ia32_insertqi (v2di, v2di, const unsigned int, const unsigned int)
The following built-in functions are available when '-msse5' is used.
All of them generate the machine instruction that is part of the name
with MMX registers.
v2df __builtin_ia32_comeqpd (v2df, v2df)
v2df __builtin_ia32_comeqps (v2df, v2df)
v4sf __builtin_ia32_comeqsd (v4sf, v4sf)
v4sf __builtin_ia32_comeqss (v4sf, v4sf)
v2df __builtin_ia32_comfalsepd (v2df, v2df)
v2df __builtin_ia32_comfalseps (v2df, v2df)
v4sf __builtin_ia32_comfalsesd (v4sf, v4sf)
v4sf __builtin_ia32_comfalsess (v4sf, v4sf)
v2df __builtin_ia32_comgepd (v2df, v2df)
v2df __builtin_ia32_comgeps (v2df, v2df)
v4sf __builtin_ia32_comgesd (v4sf, v4sf)
v4sf __builtin_ia32_comgess (v4sf, v4sf)
v2df __builtin_ia32_comgtpd (v2df, v2df)
v2df __builtin_ia32_comgtps (v2df, v2df)
v4sf __builtin_ia32_comgtsd (v4sf, v4sf)
v4sf __builtin_ia32_comgtss (v4sf, v4sf)
v2df __builtin_ia32_comlepd (v2df, v2df)
v2df __builtin_ia32_comleps (v2df, v2df)
v4sf __builtin_ia32_comlesd (v4sf, v4sf)
v4sf __builtin_ia32_comless (v4sf, v4sf)
v2df __builtin_ia32_comltpd (v2df, v2df)
v2df __builtin_ia32_comltps (v2df, v2df)
v4sf __builtin_ia32_comltsd (v4sf, v4sf)
v4sf __builtin_ia32_comltss (v4sf, v4sf)
v2df __builtin_ia32_comnepd (v2df, v2df)
v2df __builtin_ia32_comneps (v2df, v2df)
v4sf __builtin_ia32_comnesd (v4sf, v4sf)
v4sf __builtin_ia32_comness (v4sf, v4sf)
v2df __builtin_ia32_comordpd (v2df, v2df)
v2df __builtin_ia32_comordps (v2df, v2df)
v4sf __builtin_ia32_comordsd (v4sf, v4sf)
v4sf __builtin_ia32_comordss (v4sf, v4sf)
v2df __builtin_ia32_comtruepd (v2df, v2df)
v2df __builtin_ia32_comtrueps (v2df, v2df)
v4sf __builtin_ia32_comtruesd (v4sf, v4sf)
v4sf __builtin_ia32_comtruess (v4sf, v4sf)
v2df __builtin_ia32_comueqpd (v2df, v2df)
v2df __builtin_ia32_comueqps (v2df, v2df)
v4sf __builtin_ia32_comueqsd (v4sf, v4sf)
v4sf __builtin_ia32_comueqss (v4sf, v4sf)
v2df __builtin_ia32_comugepd (v2df, v2df)
v2df __builtin_ia32_comugeps (v2df, v2df)
v4sf __builtin_ia32_comugesd (v4sf, v4sf)
v4sf __builtin_ia32_comugess (v4sf, v4sf)
v2df __builtin_ia32_comugtpd (v2df, v2df)
v2df __builtin_ia32_comugtps (v2df, v2df)
v4sf __builtin_ia32_comugtsd (v4sf, v4sf)
v4sf __builtin_ia32_comugtss (v4sf, v4sf)
v2df __builtin_ia32_comulepd (v2df, v2df)
v2df __builtin_ia32_comuleps (v2df, v2df)
v4sf __builtin_ia32_comulesd (v4sf, v4sf)
v4sf __builtin_ia32_comuless (v4sf, v4sf)
v2df __builtin_ia32_comultpd (v2df, v2df)
v2df __builtin_ia32_comultps (v2df, v2df)
v4sf __builtin_ia32_comultsd (v4sf, v4sf)
v4sf __builtin_ia32_comultss (v4sf, v4sf)
v2df __builtin_ia32_comunepd (v2df, v2df)
v2df __builtin_ia32_comuneps (v2df, v2df)
v4sf __builtin_ia32_comunesd (v4sf, v4sf)
v4sf __builtin_ia32_comuness (v4sf, v4sf)
v2df __builtin_ia32_comunordpd (v2df, v2df)
v2df __builtin_ia32_comunordps (v2df, v2df)
v4sf __builtin_ia32_comunordsd (v4sf, v4sf)
v4sf __builtin_ia32_comunordss (v4sf, v4sf)
v2df __builtin_ia32_fmaddpd (v2df, v2df, v2df)
v4sf __builtin_ia32_fmaddps (v4sf, v4sf, v4sf)
v2df __builtin_ia32_fmaddsd (v2df, v2df, v2df)
v4sf __builtin_ia32_fmaddss (v4sf, v4sf, v4sf)
v2df __builtin_ia32_fmsubpd (v2df, v2df, v2df)
v4sf __builtin_ia32_fmsubps (v4sf, v4sf, v4sf)
v2df __builtin_ia32_fmsubsd (v2df, v2df, v2df)
v4sf __builtin_ia32_fmsubss (v4sf, v4sf, v4sf)
v2df __builtin_ia32_fnmaddpd (v2df, v2df, v2df)
v4sf __builtin_ia32_fnmaddps (v4sf, v4sf, v4sf)
v2df __builtin_ia32_fnmaddsd (v2df, v2df, v2df)
v4sf __builtin_ia32_fnmaddss (v4sf, v4sf, v4sf)
v2df __builtin_ia32_fnmsubpd (v2df, v2df, v2df)
v4sf __builtin_ia32_fnmsubps (v4sf, v4sf, v4sf)
v2df __builtin_ia32_fnmsubsd (v2df, v2df, v2df)
v4sf __builtin_ia32_fnmsubss (v4sf, v4sf, v4sf)
v2df __builtin_ia32_frczpd (v2df)
v4sf __builtin_ia32_frczps (v4sf)
v2df __builtin_ia32_frczsd (v2df, v2df)
v4sf __builtin_ia32_frczss (v4sf, v4sf)
v2di __builtin_ia32_pcmov (v2di, v2di, v2di)
v2di __builtin_ia32_pcmov_v2di (v2di, v2di, v2di)
v4si __builtin_ia32_pcmov_v4si (v4si, v4si, v4si)
v8hi __builtin_ia32_pcmov_v8hi (v8hi, v8hi, v8hi)
v16qi __builtin_ia32_pcmov_v16qi (v16qi, v16qi, v16qi)
v2df __builtin_ia32_pcmov_v2df (v2df, v2df, v2df)
v4sf __builtin_ia32_pcmov_v4sf (v4sf, v4sf, v4sf)
v16qi __builtin_ia32_pcomeqb (v16qi, v16qi)
v8hi __builtin_ia32_pcomeqw (v8hi, v8hi)
v4si __builtin_ia32_pcomeqd (v4si, v4si)
v2di __builtin_ia32_pcomeqq (v2di, v2di)
v16qi __builtin_ia32_pcomequb (v16qi, v16qi)
v4si __builtin_ia32_pcomequd (v4si, v4si)
v2di __builtin_ia32_pcomequq (v2di, v2di)
v8hi __builtin_ia32_pcomequw (v8hi, v8hi)
v8hi __builtin_ia32_pcomeqw (v8hi, v8hi)
v16qi __builtin_ia32_pcomfalseb (v16qi, v16qi)
v4si __builtin_ia32_pcomfalsed (v4si, v4si)
v2di __builtin_ia32_pcomfalseq (v2di, v2di)
v16qi __builtin_ia32_pcomfalseub (v16qi, v16qi)
v4si __builtin_ia32_pcomfalseud (v4si, v4si)
v2di __builtin_ia32_pcomfalseuq (v2di, v2di)
v8hi __builtin_ia32_pcomfalseuw (v8hi, v8hi)
v8hi __builtin_ia32_pcomfalsew (v8hi, v8hi)
v16qi __builtin_ia32_pcomgeb (v16qi, v16qi)
v4si __builtin_ia32_pcomged (v4si, v4si)
v2di __builtin_ia32_pcomgeq (v2di, v2di)
v16qi __builtin_ia32_pcomgeub (v16qi, v16qi)
v4si __builtin_ia32_pcomgeud (v4si, v4si)
v2di __builtin_ia32_pcomgeuq (v2di, v2di)
v8hi __builtin_ia32_pcomgeuw (v8hi, v8hi)
v8hi __builtin_ia32_pcomgew (v8hi, v8hi)
v16qi __builtin_ia32_pcomgtb (v16qi, v16qi)
v4si __builtin_ia32_pcomgtd (v4si, v4si)
v2di __builtin_ia32_pcomgtq (v2di, v2di)
v16qi __builtin_ia32_pcomgtub (v16qi, v16qi)
v4si __builtin_ia32_pcomgtud (v4si, v4si)
v2di __builtin_ia32_pcomgtuq (v2di, v2di)
v8hi __builtin_ia32_pcomgtuw (v8hi, v8hi)
v8hi __builtin_ia32_pcomgtw (v8hi, v8hi)
v16qi __builtin_ia32_pcomleb (v16qi, v16qi)
v4si __builtin_ia32_pcomled (v4si, v4si)
v2di __builtin_ia32_pcomleq (v2di, v2di)
v16qi __builtin_ia32_pcomleub (v16qi, v16qi)
v4si __builtin_ia32_pcomleud (v4si, v4si)
v2di __builtin_ia32_pcomleuq (v2di, v2di)
v8hi __builtin_ia32_pcomleuw (v8hi, v8hi)
v8hi __builtin_ia32_pcomlew (v8hi, v8hi)
v16qi __builtin_ia32_pcomltb (v16qi, v16qi)
v4si __builtin_ia32_pcomltd (v4si, v4si)
v2di __builtin_ia32_pcomltq (v2di, v2di)
v16qi __builtin_ia32_pcomltub (v16qi, v16qi)
v4si __builtin_ia32_pcomltud (v4si, v4si)
v2di __builtin_ia32_pcomltuq (v2di, v2di)
v8hi __builtin_ia32_pcomltuw (v8hi, v8hi)
v8hi __builtin_ia32_pcomltw (v8hi, v8hi)
v16qi __builtin_ia32_pcomneb (v16qi, v16qi)
v4si __builtin_ia32_pcomned (v4si, v4si)
v2di __builtin_ia32_pcomneq (v2di, v2di)
v16qi __builtin_ia32_pcomneub (v16qi, v16qi)
v4si __builtin_ia32_pcomneud (v4si, v4si)
v2di __builtin_ia32_pcomneuq (v2di, v2di)
v8hi __builtin_ia32_pcomneuw (v8hi, v8hi)
v8hi __builtin_ia32_pcomnew (v8hi, v8hi)
v16qi __builtin_ia32_pcomtrueb (v16qi, v16qi)
v4si __builtin_ia32_pcomtrued (v4si, v4si)
v2di __builtin_ia32_pcomtrueq (v2di, v2di)
v16qi __builtin_ia32_pcomtrueub (v16qi, v16qi)
v4si __builtin_ia32_pcomtrueud (v4si, v4si)
v2di __builtin_ia32_pcomtrueuq (v2di, v2di)
v8hi __builtin_ia32_pcomtrueuw (v8hi, v8hi)
v8hi __builtin_ia32_pcomtruew (v8hi, v8hi)
v4df __builtin_ia32_permpd (v2df, v2df, v16qi)
v4sf __builtin_ia32_permps (v4sf, v4sf, v16qi)
v4si __builtin_ia32_phaddbd (v16qi)
v2di __builtin_ia32_phaddbq (v16qi)
v8hi __builtin_ia32_phaddbw (v16qi)
v2di __builtin_ia32_phadddq (v4si)
v4si __builtin_ia32_phaddubd (v16qi)
v2di __builtin_ia32_phaddubq (v16qi)
v8hi __builtin_ia32_phaddubw (v16qi)
v2di __builtin_ia32_phaddudq (v4si)
v4si __builtin_ia32_phadduwd (v8hi)
v2di __builtin_ia32_phadduwq (v8hi)
v4si __builtin_ia32_phaddwd (v8hi)
v2di __builtin_ia32_phaddwq (v8hi)
v8hi __builtin_ia32_phsubbw (v16qi)
v2di __builtin_ia32_phsubdq (v4si)
v4si __builtin_ia32_phsubwd (v8hi)
v4si __builtin_ia32_pmacsdd (v4si, v4si, v4si)
v2di __builtin_ia32_pmacsdqh (v4si, v4si, v2di)
v2di __builtin_ia32_pmacsdql (v4si, v4si, v2di)
v4si __builtin_ia32_pmacssdd (v4si, v4si, v4si)
v2di __builtin_ia32_pmacssdqh (v4si, v4si, v2di)
v2di __builtin_ia32_pmacssdql (v4si, v4si, v2di)
v4si __builtin_ia32_pmacsswd (v8hi, v8hi, v4si)
v8hi __builtin_ia32_pmacssww (v8hi, v8hi, v8hi)
v4si __builtin_ia32_pmacswd (v8hi, v8hi, v4si)
v8hi __builtin_ia32_pmacsww (v8hi, v8hi, v8hi)
v4si __builtin_ia32_pmadcsswd (v8hi, v8hi, v4si)
v4si __builtin_ia32_pmadcswd (v8hi, v8hi, v4si)
v16qi __builtin_ia32_pperm (v16qi, v16qi, v16qi)
v16qi __builtin_ia32_protb (v16qi, v16qi)
v4si __builtin_ia32_protd (v4si, v4si)
v2di __builtin_ia32_protq (v2di, v2di)
v8hi __builtin_ia32_protw (v8hi, v8hi)
v16qi __builtin_ia32_pshab (v16qi, v16qi)
v4si __builtin_ia32_pshad (v4si, v4si)
v2di __builtin_ia32_pshaq (v2di, v2di)
v8hi __builtin_ia32_pshaw (v8hi, v8hi)
v16qi __builtin_ia32_pshlb (v16qi, v16qi)
v4si __builtin_ia32_pshld (v4si, v4si)
v2di __builtin_ia32_pshlq (v2di, v2di)
v8hi __builtin_ia32_pshlw (v8hi, v8hi)
The following builtin-in functions are available when '-msse5' is used.
The second argument must be an integer constant and generate the machine
instruction that is part of the name with the '_imm' suffix removed.
v16qi __builtin_ia32_protb_imm (v16qi, int)
v4si __builtin_ia32_protd_imm (v4si, int)
v2di __builtin_ia32_protq_imm (v2di, int)
v8hi __builtin_ia32_protw_imm (v8hi, int)
The following built-in functions are available when '-m3dnow' is used.
All of them generate the machine instruction that is part of the name.
void __builtin_ia32_femms (void)
v8qi __builtin_ia32_pavgusb (v8qi, v8qi)
v2si __builtin_ia32_pf2id (v2sf)
v2sf __builtin_ia32_pfacc (v2sf, v2sf)
v2sf __builtin_ia32_pfadd (v2sf, v2sf)
v2si __builtin_ia32_pfcmpeq (v2sf, v2sf)
v2si __builtin_ia32_pfcmpge (v2sf, v2sf)
v2si __builtin_ia32_pfcmpgt (v2sf, v2sf)
v2sf __builtin_ia32_pfmax (v2sf, v2sf)
v2sf __builtin_ia32_pfmin (v2sf, v2sf)
v2sf __builtin_ia32_pfmul (v2sf, v2sf)
v2sf __builtin_ia32_pfrcp (v2sf)
v2sf __builtin_ia32_pfrcpit1 (v2sf, v2sf)
v2sf __builtin_ia32_pfrcpit2 (v2sf, v2sf)
v2sf __builtin_ia32_pfrsqrt (v2sf)
v2sf __builtin_ia32_pfrsqrtit1 (v2sf, v2sf)
v2sf __builtin_ia32_pfsub (v2sf, v2sf)
v2sf __builtin_ia32_pfsubr (v2sf, v2sf)
v2sf __builtin_ia32_pi2fd (v2si)
v4hi __builtin_ia32_pmulhrw (v4hi, v4hi)
The following built-in functions are available when both '-m3dnow' and
'-march=athlon' are used. All of them generate the machine instruction
that is part of the name.
v2si __builtin_ia32_pf2iw (v2sf)
v2sf __builtin_ia32_pfnacc (v2sf, v2sf)
v2sf __builtin_ia32_pfpnacc (v2sf, v2sf)
v2sf __builtin_ia32_pi2fw (v2si)
v2sf __builtin_ia32_pswapdsf (v2sf)
v2si __builtin_ia32_pswapdsi (v2si)

File: gcc.info, Node: MIPS DSP Built-in Functions, Next: MIPS Paired-Single Support, Prev: X86 Built-in Functions, Up: Target Builtins
5.50.7 MIPS DSP Built-in Functions
----------------------------------
The MIPS DSP Application-Specific Extension (ASE) includes new
instructions that are designed to improve the performance of DSP and
media applications. It provides instructions that operate on packed
8-bit/16-bit integer data, Q7, Q15 and Q31 fractional data.
GCC supports MIPS DSP operations using both the generic vector
extensions (*note Vector Extensions::) and a collection of MIPS-specific
built-in functions. Both kinds of support are enabled by the '-mdsp'
command-line option.
Revision 2 of the ASE was introduced in the second half of 2006. This
revision adds extra instructions to the original ASE, but is otherwise
backwards-compatible with it. You can select revision 2 using the
command-line option '-mdspr2'; this option implies '-mdsp'.
At present, GCC only provides support for operations on 32-bit vectors.
The vector type associated with 8-bit integer data is usually called
'v4i8', the vector type associated with Q7 is usually called 'v4q7', the
vector type associated with 16-bit integer data is usually called
'v2i16', and the vector type associated with Q15 is usually called
'v2q15'. They can be defined in C as follows:
typedef signed char v4i8 __attribute__ ((vector_size(4)));
typedef signed char v4q7 __attribute__ ((vector_size(4)));
typedef short v2i16 __attribute__ ((vector_size(4)));
typedef short v2q15 __attribute__ ((vector_size(4)));
'v4i8', 'v4q7', 'v2i16' and 'v2q15' values are initialized in the same
way as aggregates. For example:
v4i8 a = {1, 2, 3, 4};
v4i8 b;
b = (v4i8) {5, 6, 7, 8};
v2q15 c = {0x0fcb, 0x3a75};
v2q15 d;
d = (v2q15) {0.1234 * 0x1.0p15, 0.4567 * 0x1.0p15};
_Note:_ The CPU's endianness determines the order in which values are
packed. On little-endian targets, the first value is the least
significant and the last value is the most significant. The opposite
order applies to big-endian targets. For example, the code above will
set the lowest byte of 'a' to '1' on little-endian targets and '4' on
big-endian targets.
_Note:_ Q7, Q15 and Q31 values must be initialized with their integer
representation. As shown in this example, the integer representation of
a Q7 value can be obtained by multiplying the fractional value by
'0x1.0p7'. The equivalent for Q15 values is to multiply by '0x1.0p15'.
The equivalent for Q31 values is to multiply by '0x1.0p31'.
The table below lists the 'v4i8' and 'v2q15' operations for which
hardware support exists. 'a' and 'b' are 'v4i8' values, and 'c' and 'd'
are 'v2q15' values.
C code MIPS instruction
'a + b' 'addu.qb'
'c + d' 'addq.ph'
'a - b' 'subu.qb'
'c - d' 'subq.ph'
The table below lists the 'v2i16' operation for which hardware support
exists for the DSP ASE REV 2. 'e' and 'f' are 'v2i16' values.
C code MIPS instruction
'e * f' 'mul.ph'
It is easier to describe the DSP built-in functions if we first define
the following types:
typedef int q31;
typedef int i32;
typedef unsigned int ui32;
typedef long long a64;
'q31' and 'i32' are actually the same as 'int', but we use 'q31' to
indicate a Q31 fractional value and 'i32' to indicate a 32-bit integer
value. Similarly, 'a64' is the same as 'long long', but we use 'a64' to
indicate values that will be placed in one of the four DSP accumulators
('$ac0', '$ac1', '$ac2' or '$ac3').
Also, some built-in functions prefer or require immediate numbers as
parameters, because the corresponding DSP instructions accept both
immediate numbers and register operands, or accept immediate numbers
only. The immediate parameters are listed as follows.
imm0_3: 0 to 3.
imm0_7: 0 to 7.
imm0_15: 0 to 15.
imm0_31: 0 to 31.
imm0_63: 0 to 63.
imm0_255: 0 to 255.
imm_n32_31: -32 to 31.
imm_n512_511: -512 to 511.
The following built-in functions map directly to a particular MIPS DSP
instruction. Please refer to the architecture specification for details
on what each instruction does.
v2q15 __builtin_mips_addq_ph (v2q15, v2q15)
v2q15 __builtin_mips_addq_s_ph (v2q15, v2q15)
q31 __builtin_mips_addq_s_w (q31, q31)
v4i8 __builtin_mips_addu_qb (v4i8, v4i8)
v4i8 __builtin_mips_addu_s_qb (v4i8, v4i8)
v2q15 __builtin_mips_subq_ph (v2q15, v2q15)
v2q15 __builtin_mips_subq_s_ph (v2q15, v2q15)
q31 __builtin_mips_subq_s_w (q31, q31)
v4i8 __builtin_mips_subu_qb (v4i8, v4i8)
v4i8 __builtin_mips_subu_s_qb (v4i8, v4i8)
i32 __builtin_mips_addsc (i32, i32)
i32 __builtin_mips_addwc (i32, i32)
i32 __builtin_mips_modsub (i32, i32)
i32 __builtin_mips_raddu_w_qb (v4i8)
v2q15 __builtin_mips_absq_s_ph (v2q15)
q31 __builtin_mips_absq_s_w (q31)
v4i8 __builtin_mips_precrq_qb_ph (v2q15, v2q15)
v2q15 __builtin_mips_precrq_ph_w (q31, q31)
v2q15 __builtin_mips_precrq_rs_ph_w (q31, q31)
v4i8 __builtin_mips_precrqu_s_qb_ph (v2q15, v2q15)
q31 __builtin_mips_preceq_w_phl (v2q15)
q31 __builtin_mips_preceq_w_phr (v2q15)
v2q15 __builtin_mips_precequ_ph_qbl (v4i8)
v2q15 __builtin_mips_precequ_ph_qbr (v4i8)
v2q15 __builtin_mips_precequ_ph_qbla (v4i8)
v2q15 __builtin_mips_precequ_ph_qbra (v4i8)
v2q15 __builtin_mips_preceu_ph_qbl (v4i8)
v2q15 __builtin_mips_preceu_ph_qbr (v4i8)
v2q15 __builtin_mips_preceu_ph_qbla (v4i8)
v2q15 __builtin_mips_preceu_ph_qbra (v4i8)
v4i8 __builtin_mips_shll_qb (v4i8, imm0_7)
v4i8 __builtin_mips_shll_qb (v4i8, i32)
v2q15 __builtin_mips_shll_ph (v2q15, imm0_15)
v2q15 __builtin_mips_shll_ph (v2q15, i32)
v2q15 __builtin_mips_shll_s_ph (v2q15, imm0_15)
v2q15 __builtin_mips_shll_s_ph (v2q15, i32)
q31 __builtin_mips_shll_s_w (q31, imm0_31)
q31 __builtin_mips_shll_s_w (q31, i32)
v4i8 __builtin_mips_shrl_qb (v4i8, imm0_7)
v4i8 __builtin_mips_shrl_qb (v4i8, i32)
v2q15 __builtin_mips_shra_ph (v2q15, imm0_15)
v2q15 __builtin_mips_shra_ph (v2q15, i32)
v2q15 __builtin_mips_shra_r_ph (v2q15, imm0_15)
v2q15 __builtin_mips_shra_r_ph (v2q15, i32)
q31 __builtin_mips_shra_r_w (q31, imm0_31)
q31 __builtin_mips_shra_r_w (q31, i32)
v2q15 __builtin_mips_muleu_s_ph_qbl (v4i8, v2q15)
v2q15 __builtin_mips_muleu_s_ph_qbr (v4i8, v2q15)
v2q15 __builtin_mips_mulq_rs_ph (v2q15, v2q15)
q31 __builtin_mips_muleq_s_w_phl (v2q15, v2q15)
q31 __builtin_mips_muleq_s_w_phr (v2q15, v2q15)
a64 __builtin_mips_dpau_h_qbl (a64, v4i8, v4i8)
a64 __builtin_mips_dpau_h_qbr (a64, v4i8, v4i8)
a64 __builtin_mips_dpsu_h_qbl (a64, v4i8, v4i8)
a64 __builtin_mips_dpsu_h_qbr (a64, v4i8, v4i8)
a64 __builtin_mips_dpaq_s_w_ph (a64, v2q15, v2q15)
a64 __builtin_mips_dpaq_sa_l_w (a64, q31, q31)
a64 __builtin_mips_dpsq_s_w_ph (a64, v2q15, v2q15)
a64 __builtin_mips_dpsq_sa_l_w (a64, q31, q31)
a64 __builtin_mips_mulsaq_s_w_ph (a64, v2q15, v2q15)
a64 __builtin_mips_maq_s_w_phl (a64, v2q15, v2q15)
a64 __builtin_mips_maq_s_w_phr (a64, v2q15, v2q15)
a64 __builtin_mips_maq_sa_w_phl (a64, v2q15, v2q15)
a64 __builtin_mips_maq_sa_w_phr (a64, v2q15, v2q15)
i32 __builtin_mips_bitrev (i32)
i32 __builtin_mips_insv (i32, i32)
v4i8 __builtin_mips_repl_qb (imm0_255)
v4i8 __builtin_mips_repl_qb (i32)
v2q15 __builtin_mips_repl_ph (imm_n512_511)
v2q15 __builtin_mips_repl_ph (i32)
void __builtin_mips_cmpu_eq_qb (v4i8, v4i8)
void __builtin_mips_cmpu_lt_qb (v4i8, v4i8)
void __builtin_mips_cmpu_le_qb (v4i8, v4i8)
i32 __builtin_mips_cmpgu_eq_qb (v4i8, v4i8)
i32 __builtin_mips_cmpgu_lt_qb (v4i8, v4i8)
i32 __builtin_mips_cmpgu_le_qb (v4i8, v4i8)
void __builtin_mips_cmp_eq_ph (v2q15, v2q15)
void __builtin_mips_cmp_lt_ph (v2q15, v2q15)
void __builtin_mips_cmp_le_ph (v2q15, v2q15)
v4i8 __builtin_mips_pick_qb (v4i8, v4i8)
v2q15 __builtin_mips_pick_ph (v2q15, v2q15)
v2q15 __builtin_mips_packrl_ph (v2q15, v2q15)
i32 __builtin_mips_extr_w (a64, imm0_31)
i32 __builtin_mips_extr_w (a64, i32)
i32 __builtin_mips_extr_r_w (a64, imm0_31)
i32 __builtin_mips_extr_s_h (a64, i32)
i32 __builtin_mips_extr_rs_w (a64, imm0_31)
i32 __builtin_mips_extr_rs_w (a64, i32)
i32 __builtin_mips_extr_s_h (a64, imm0_31)
i32 __builtin_mips_extr_r_w (a64, i32)
i32 __builtin_mips_extp (a64, imm0_31)
i32 __builtin_mips_extp (a64, i32)
i32 __builtin_mips_extpdp (a64, imm0_31)
i32 __builtin_mips_extpdp (a64, i32)
a64 __builtin_mips_shilo (a64, imm_n32_31)
a64 __builtin_mips_shilo (a64, i32)
a64 __builtin_mips_mthlip (a64, i32)
void __builtin_mips_wrdsp (i32, imm0_63)
i32 __builtin_mips_rddsp (imm0_63)
i32 __builtin_mips_lbux (void *, i32)
i32 __builtin_mips_lhx (void *, i32)
i32 __builtin_mips_lwx (void *, i32)
i32 __builtin_mips_bposge32 (void)
The following built-in functions map directly to a particular MIPS DSP
REV 2 instruction. Please refer to the architecture specification for
details on what each instruction does.
v4q7 __builtin_mips_absq_s_qb (v4q7);
v2i16 __builtin_mips_addu_ph (v2i16, v2i16);
v2i16 __builtin_mips_addu_s_ph (v2i16, v2i16);
v4i8 __builtin_mips_adduh_qb (v4i8, v4i8);
v4i8 __builtin_mips_adduh_r_qb (v4i8, v4i8);
i32 __builtin_mips_append (i32, i32, imm0_31);
i32 __builtin_mips_balign (i32, i32, imm0_3);
i32 __builtin_mips_cmpgdu_eq_qb (v4i8, v4i8);
i32 __builtin_mips_cmpgdu_lt_qb (v4i8, v4i8);
i32 __builtin_mips_cmpgdu_le_qb (v4i8, v4i8);
a64 __builtin_mips_dpa_w_ph (a64, v2i16, v2i16);
a64 __builtin_mips_dps_w_ph (a64, v2i16, v2i16);
a64 __builtin_mips_madd (a64, i32, i32);
a64 __builtin_mips_maddu (a64, ui32, ui32);
a64 __builtin_mips_msub (a64, i32, i32);
a64 __builtin_mips_msubu (a64, ui32, ui32);
v2i16 __builtin_mips_mul_ph (v2i16, v2i16);
v2i16 __builtin_mips_mul_s_ph (v2i16, v2i16);
q31 __builtin_mips_mulq_rs_w (q31, q31);
v2q15 __builtin_mips_mulq_s_ph (v2q15, v2q15);
q31 __builtin_mips_mulq_s_w (q31, q31);
a64 __builtin_mips_mulsa_w_ph (a64, v2i16, v2i16);
a64 __builtin_mips_mult (i32, i32);
a64 __builtin_mips_multu (ui32, ui32);
v4i8 __builtin_mips_precr_qb_ph (v2i16, v2i16);
v2i16 __builtin_mips_precr_sra_ph_w (i32, i32, imm0_31);
v2i16 __builtin_mips_precr_sra_r_ph_w (i32, i32, imm0_31);
i32 __builtin_mips_prepend (i32, i32, imm0_31);
v4i8 __builtin_mips_shra_qb (v4i8, imm0_7);
v4i8 __builtin_mips_shra_r_qb (v4i8, imm0_7);
v4i8 __builtin_mips_shra_qb (v4i8, i32);
v4i8 __builtin_mips_shra_r_qb (v4i8, i32);
v2i16 __builtin_mips_shrl_ph (v2i16, imm0_15);
v2i16 __builtin_mips_shrl_ph (v2i16, i32);
v2i16 __builtin_mips_subu_ph (v2i16, v2i16);
v2i16 __builtin_mips_subu_s_ph (v2i16, v2i16);
v4i8 __builtin_mips_subuh_qb (v4i8, v4i8);
v4i8 __builtin_mips_subuh_r_qb (v4i8, v4i8);
v2q15 __builtin_mips_addqh_ph (v2q15, v2q15);
v2q15 __builtin_mips_addqh_r_ph (v2q15, v2q15);
q31 __builtin_mips_addqh_w (q31, q31);
q31 __builtin_mips_addqh_r_w (q31, q31);
v2q15 __builtin_mips_subqh_ph (v2q15, v2q15);
v2q15 __builtin_mips_subqh_r_ph (v2q15, v2q15);
q31 __builtin_mips_subqh_w (q31, q31);
q31 __builtin_mips_subqh_r_w (q31, q31);
a64 __builtin_mips_dpax_w_ph (a64, v2i16, v2i16);
a64 __builtin_mips_dpsx_w_ph (a64, v2i16, v2i16);
a64 __builtin_mips_dpaqx_s_w_ph (a64, v2q15, v2q15);
a64 __builtin_mips_dpaqx_sa_w_ph (a64, v2q15, v2q15);
a64 __builtin_mips_dpsqx_s_w_ph (a64, v2q15, v2q15);
a64 __builtin_mips_dpsqx_sa_w_ph (a64, v2q15, v2q15);

File: gcc.info, Node: MIPS Paired-Single Support, Next: PowerPC AltiVec Built-in Functions, Prev: MIPS DSP Built-in Functions, Up: Target Builtins
5.50.8 MIPS Paired-Single Support
---------------------------------
The MIPS64 architecture includes a number of instructions that operate
on pairs of single-precision floating-point values. Each pair is packed
into a 64-bit floating-point register, with one element being designated
the "upper half" and the other being designated the "lower half".
GCC supports paired-single operations using both the generic vector
extensions (*note Vector Extensions::) and a collection of MIPS-specific
built-in functions. Both kinds of support are enabled by the
'-mpaired-single' command-line option.
The vector type associated with paired-single values is usually called
'v2sf'. It can be defined in C as follows:
typedef float v2sf __attribute__ ((vector_size (8)));
'v2sf' values are initialized in the same way as aggregates. For
example:
v2sf a = {1.5, 9.1};
v2sf b;
float e, f;
b = (v2sf) {e, f};
_Note:_ The CPU's endianness determines which value is stored in the
upper half of a register and which value is stored in the lower half.
On little-endian targets, the first value is the lower one and the
second value is the upper one. The opposite order applies to big-endian
targets. For example, the code above will set the lower half of 'a' to
'1.5' on little-endian targets and '9.1' on big-endian targets.
* Menu:
* Paired-Single Arithmetic::
* Paired-Single Built-in Functions::
* MIPS-3D Built-in Functions::

File: gcc.info, Node: Paired-Single Arithmetic, Next: Paired-Single Built-in Functions, Up: MIPS Paired-Single Support
5.50.8.1 Paired-Single Arithmetic
.................................
The table below lists the 'v2sf' operations for which hardware support
exists. 'a', 'b' and 'c' are 'v2sf' values and 'x' is an integral
value.
C code MIPS instruction
'a + b' 'add.ps'
'a - b' 'sub.ps'
'-a' 'neg.ps'
'a * b' 'mul.ps'
'a * b + c' 'madd.ps'
'a * b - c' 'msub.ps'
'-(a * b + c)' 'nmadd.ps'
'-(a * b - c)' 'nmsub.ps'
'x ? a : b' 'movn.ps'/'movz.ps'
Note that the multiply-accumulate instructions can be disabled using
the command-line option '-mno-fused-madd'.

File: gcc.info, Node: Paired-Single Built-in Functions, Next: MIPS-3D Built-in Functions, Prev: Paired-Single Arithmetic, Up: MIPS Paired-Single Support
5.50.8.2 Paired-Single Built-in Functions
.........................................
The following paired-single functions map directly to a particular MIPS
instruction. Please refer to the architecture specification for details
on what each instruction does.
'v2sf __builtin_mips_pll_ps (v2sf, v2sf)'
Pair lower lower ('pll.ps').
'v2sf __builtin_mips_pul_ps (v2sf, v2sf)'
Pair upper lower ('pul.ps').
'v2sf __builtin_mips_plu_ps (v2sf, v2sf)'
Pair lower upper ('plu.ps').
'v2sf __builtin_mips_puu_ps (v2sf, v2sf)'
Pair upper upper ('puu.ps').
'v2sf __builtin_mips_cvt_ps_s (float, float)'
Convert pair to paired single ('cvt.ps.s').
'float __builtin_mips_cvt_s_pl (v2sf)'
Convert pair lower to single ('cvt.s.pl').
'float __builtin_mips_cvt_s_pu (v2sf)'
Convert pair upper to single ('cvt.s.pu').
'v2sf __builtin_mips_abs_ps (v2sf)'
Absolute value ('abs.ps').
'v2sf __builtin_mips_alnv_ps (v2sf, v2sf, int)'
Align variable ('alnv.ps').
_Note:_ The value of the third parameter must be 0 or 4 modulo 8,
otherwise the result will be unpredictable. Please read the
instruction description for details.
The following multi-instruction functions are also available. In each
case, COND can be any of the 16 floating-point conditions: 'f', 'un',
'eq', 'ueq', 'olt', 'ult', 'ole', 'ule', 'sf', 'ngle', 'seq', 'ngl',
'lt', 'nge', 'le' or 'ngt'.
'v2sf __builtin_mips_movt_c_COND_ps (v2sf A, v2sf B, v2sf C, v2sf D)'
'v2sf __builtin_mips_movf_c_COND_ps (v2sf A, v2sf B, v2sf C, v2sf D)'
Conditional move based on floating point comparison ('c.COND.ps',
'movt.ps'/'movf.ps').
The 'movt' functions return the value X computed by:
c.COND.ps CC,A,B
mov.ps X,C
movt.ps X,D,CC
The 'movf' functions are similar but use 'movf.ps' instead of
'movt.ps'.
'int __builtin_mips_upper_c_COND_ps (v2sf A, v2sf B)'
'int __builtin_mips_lower_c_COND_ps (v2sf A, v2sf B)'
Comparison of two paired-single values ('c.COND.ps',
'bc1t'/'bc1f').
These functions compare A and B using 'c.COND.ps' and return either
the upper or lower half of the result. For example:
v2sf a, b;
if (__builtin_mips_upper_c_eq_ps (a, b))
upper_halves_are_equal ();
else
upper_halves_are_unequal ();
if (__builtin_mips_lower_c_eq_ps (a, b))
lower_halves_are_equal ();
else
lower_halves_are_unequal ();

File: gcc.info, Node: MIPS-3D Built-in Functions, Prev: Paired-Single Built-in Functions, Up: MIPS Paired-Single Support
5.50.8.3 MIPS-3D Built-in Functions
...................................
The MIPS-3D Application-Specific Extension (ASE) includes additional
paired-single instructions that are designed to improve the performance
of 3D graphics operations. Support for these instructions is controlled
by the '-mips3d' command-line option.
The functions listed below map directly to a particular MIPS-3D
instruction. Please refer to the architecture specification for more
details on what each instruction does.
'v2sf __builtin_mips_addr_ps (v2sf, v2sf)'
Reduction add ('addr.ps').
'v2sf __builtin_mips_mulr_ps (v2sf, v2sf)'
Reduction multiply ('mulr.ps').
'v2sf __builtin_mips_cvt_pw_ps (v2sf)'
Convert paired single to paired word ('cvt.pw.ps').
'v2sf __builtin_mips_cvt_ps_pw (v2sf)'
Convert paired word to paired single ('cvt.ps.pw').
'float __builtin_mips_recip1_s (float)'
'double __builtin_mips_recip1_d (double)'
'v2sf __builtin_mips_recip1_ps (v2sf)'
Reduced precision reciprocal (sequence step 1) ('recip1.FMT').
'float __builtin_mips_recip2_s (float, float)'
'double __builtin_mips_recip2_d (double, double)'
'v2sf __builtin_mips_recip2_ps (v2sf, v2sf)'
Reduced precision reciprocal (sequence step 2) ('recip2.FMT').
'float __builtin_mips_rsqrt1_s (float)'
'double __builtin_mips_rsqrt1_d (double)'
'v2sf __builtin_mips_rsqrt1_ps (v2sf)'
Reduced precision reciprocal square root (sequence step 1)
('rsqrt1.FMT').
'float __builtin_mips_rsqrt2_s (float, float)'
'double __builtin_mips_rsqrt2_d (double, double)'
'v2sf __builtin_mips_rsqrt2_ps (v2sf, v2sf)'
Reduced precision reciprocal square root (sequence step 2)
('rsqrt2.FMT').
The following multi-instruction functions are also available. In each
case, COND can be any of the 16 floating-point conditions: 'f', 'un',
'eq', 'ueq', 'olt', 'ult', 'ole', 'ule', 'sf', 'ngle', 'seq', 'ngl',
'lt', 'nge', 'le' or 'ngt'.
'int __builtin_mips_cabs_COND_s (float A, float B)'
'int __builtin_mips_cabs_COND_d (double A, double B)'
Absolute comparison of two scalar values ('cabs.COND.FMT',
'bc1t'/'bc1f').
These functions compare A and B using 'cabs.COND.s' or
'cabs.COND.d' and return the result as a boolean value. For
example:
float a, b;
if (__builtin_mips_cabs_eq_s (a, b))
true ();
else
false ();
'int __builtin_mips_upper_cabs_COND_ps (v2sf A, v2sf B)'
'int __builtin_mips_lower_cabs_COND_ps (v2sf A, v2sf B)'
Absolute comparison of two paired-single values ('cabs.COND.ps',
'bc1t'/'bc1f').
These functions compare A and B using 'cabs.COND.ps' and return
either the upper or lower half of the result. For example:
v2sf a, b;
if (__builtin_mips_upper_cabs_eq_ps (a, b))
upper_halves_are_equal ();
else
upper_halves_are_unequal ();
if (__builtin_mips_lower_cabs_eq_ps (a, b))
lower_halves_are_equal ();
else
lower_halves_are_unequal ();
'v2sf __builtin_mips_movt_cabs_COND_ps (v2sf A, v2sf B, v2sf C, v2sf D)'
'v2sf __builtin_mips_movf_cabs_COND_ps (v2sf A, v2sf B, v2sf C, v2sf D)'
Conditional move based on absolute comparison ('cabs.COND.ps',
'movt.ps'/'movf.ps').
The 'movt' functions return the value X computed by:
cabs.COND.ps CC,A,B
mov.ps X,C
movt.ps X,D,CC
The 'movf' functions are similar but use 'movf.ps' instead of
'movt.ps'.
'int __builtin_mips_any_c_COND_ps (v2sf A, v2sf B)'
'int __builtin_mips_all_c_COND_ps (v2sf A, v2sf B)'
'int __builtin_mips_any_cabs_COND_ps (v2sf A, v2sf B)'
'int __builtin_mips_all_cabs_COND_ps (v2sf A, v2sf B)'
Comparison of two paired-single values ('c.COND.ps'/'cabs.COND.ps',
'bc1any2t'/'bc1any2f').
These functions compare A and B using 'c.COND.ps' or
'cabs.COND.ps'. The 'any' forms return true if either result is
true and the 'all' forms return true if both results are true. For
example:
v2sf a, b;
if (__builtin_mips_any_c_eq_ps (a, b))
one_is_true ();
else
both_are_false ();
if (__builtin_mips_all_c_eq_ps (a, b))
both_are_true ();
else
one_is_false ();
'int __builtin_mips_any_c_COND_4s (v2sf A, v2sf B, v2sf C, v2sf D)'
'int __builtin_mips_all_c_COND_4s (v2sf A, v2sf B, v2sf C, v2sf D)'
'int __builtin_mips_any_cabs_COND_4s (v2sf A, v2sf B, v2sf C, v2sf D)'
'int __builtin_mips_all_cabs_COND_4s (v2sf A, v2sf B, v2sf C, v2sf D)'
Comparison of four paired-single values
('c.COND.ps'/'cabs.COND.ps', 'bc1any4t'/'bc1any4f').
These functions use 'c.COND.ps' or 'cabs.COND.ps' to compare A with
B and to compare C with D. The 'any' forms return true if any of
the four results are true and the 'all' forms return true if all
four results are true. For example:
v2sf a, b, c, d;
if (__builtin_mips_any_c_eq_4s (a, b, c, d))
some_are_true ();
else
all_are_false ();
if (__builtin_mips_all_c_eq_4s (a, b, c, d))
all_are_true ();
else
some_are_false ();

File: gcc.info, Node: PowerPC AltiVec Built-in Functions, Next: SPARC VIS Built-in Functions, Prev: MIPS Paired-Single Support, Up: Target Builtins
5.50.9 PowerPC AltiVec Built-in Functions
-----------------------------------------
GCC provides an interface for the PowerPC family of processors to access
the AltiVec operations described in Motorola's AltiVec Programming
Interface Manual. The interface is made available by including
'<altivec.h>' and using '-maltivec' and '-mabi=altivec'. The interface
supports the following vector types.
vector unsigned char
vector signed char
vector bool char
vector unsigned short
vector signed short
vector bool short
vector pixel
vector unsigned int
vector signed int
vector bool int
vector float
GCC's implementation of the high-level language interface available
from C and C++ code differs from Motorola's documentation in several
ways.
* A vector constant is a list of constant expressions within curly
braces.
* A vector initializer requires no cast if the vector constant is of
the same type as the variable it is initializing.
* If 'signed' or 'unsigned' is omitted, the signedness of the vector
type is the default signedness of the base type. The default
varies depending on the operating system, so a portable program
should always specify the signedness.
* Compiling with '-maltivec' adds keywords '__vector', '__pixel', and
'__bool'. Macros 'vector', 'pixel', and 'bool' are defined in
'<altivec.h>' and can be undefined.
* GCC allows using a 'typedef' name as the type specifier for a
vector type.
* For C, overloaded functions are implemented with macros so the
following does not work:
vec_add ((vector signed int){1, 2, 3, 4}, foo);
Since 'vec_add' is a macro, the vector constant in the example is
treated as four separate arguments. Wrap the entire argument in
parentheses for this to work.
_Note:_ Only the '<altivec.h>' interface is supported. Internally, GCC
uses built-in functions to achieve the functionality in the
aforementioned header file, but they are not supported and are subject
to change without notice.
The following interfaces are supported for the generic and specific
AltiVec operations and the AltiVec predicates. In cases where there is
a direct mapping between generic and specific operations, only the
generic names are shown here, although the specific operations can also
be used.
Arguments that are documented as 'const int' require literal integral
values within the range required for that operation.
vector signed char vec_abs (vector signed char);
vector signed short vec_abs (vector signed short);
vector signed int vec_abs (vector signed int);
vector float vec_abs (vector float);
vector signed char vec_abss (vector signed char);
vector signed short vec_abss (vector signed short);
vector signed int vec_abss (vector signed int);
vector signed char vec_add (vector bool char, vector signed char);
vector signed char vec_add (vector signed char, vector bool char);
vector signed char vec_add (vector signed char, vector signed char);
vector unsigned char vec_add (vector bool char, vector unsigned char);
vector unsigned char vec_add (vector unsigned char, vector bool char);
vector unsigned char vec_add (vector unsigned char,
vector unsigned char);
vector signed short vec_add (vector bool short, vector signed short);
vector signed short vec_add (vector signed short, vector bool short);
vector signed short vec_add (vector signed short, vector signed short);
vector unsigned short vec_add (vector bool short,
vector unsigned short);
vector unsigned short vec_add (vector unsigned short,
vector bool short);
vector unsigned short vec_add (vector unsigned short,
vector unsigned short);
vector signed int vec_add (vector bool int, vector signed int);
vector signed int vec_add (vector signed int, vector bool int);
vector signed int vec_add (vector signed int, vector signed int);
vector unsigned int vec_add (vector bool int, vector unsigned int);
vector unsigned int vec_add (vector unsigned int, vector bool int);
vector unsigned int vec_add (vector unsigned int, vector unsigned int);
vector float vec_add (vector float, vector float);
vector float vec_vaddfp (vector float, vector float);
vector signed int vec_vadduwm (vector bool int, vector signed int);
vector signed int vec_vadduwm (vector signed int, vector bool int);
vector signed int vec_vadduwm (vector signed int, vector signed int);
vector unsigned int vec_vadduwm (vector bool int, vector unsigned int);
vector unsigned int vec_vadduwm (vector unsigned int, vector bool int);
vector unsigned int vec_vadduwm (vector unsigned int,
vector unsigned int);
vector signed short vec_vadduhm (vector bool short,
vector signed short);
vector signed short vec_vadduhm (vector signed short,
vector bool short);
vector signed short vec_vadduhm (vector signed short,
vector signed short);
vector unsigned short vec_vadduhm (vector bool short,
vector unsigned short);
vector unsigned short vec_vadduhm (vector unsigned short,
vector bool short);
vector unsigned short vec_vadduhm (vector unsigned short,
vector unsigned short);
vector signed char vec_vaddubm (vector bool char, vector signed char);
vector signed char vec_vaddubm (vector signed char, vector bool char);
vector signed char vec_vaddubm (vector signed char, vector signed char);
vector unsigned char vec_vaddubm (vector bool char,
vector unsigned char);
vector unsigned char vec_vaddubm (vector unsigned char,
vector bool char);
vector unsigned char vec_vaddubm (vector unsigned char,
vector unsigned char);
vector unsigned int vec_addc (vector unsigned int, vector unsigned int);
vector unsigned char vec_adds (vector bool char, vector unsigned char);
vector unsigned char vec_adds (vector unsigned char, vector bool char);
vector unsigned char vec_adds (vector unsigned char,
vector unsigned char);
vector signed char vec_adds (vector bool char, vector signed char);
vector signed char vec_adds (vector signed char, vector bool char);
vector signed char vec_adds (vector signed char, vector signed char);
vector unsigned short vec_adds (vector bool short,
vector unsigned short);
vector unsigned short vec_adds (vector unsigned short,
vector bool short);
vector unsigned short vec_adds (vector unsigned short,
vector unsigned short);
vector signed short vec_adds (vector bool short, vector signed short);
vector signed short vec_adds (vector signed short, vector bool short);
vector signed short vec_adds (vector signed short, vector signed short);
vector unsigned int vec_adds (vector bool int, vector unsigned int);
vector unsigned int vec_adds (vector unsigned int, vector bool int);
vector unsigned int vec_adds (vector unsigned int, vector unsigned int);
vector signed int vec_adds (vector bool int, vector signed int);
vector signed int vec_adds (vector signed int, vector bool int);
vector signed int vec_adds (vector signed int, vector signed int);
vector signed int vec_vaddsws (vector bool int, vector signed int);
vector signed int vec_vaddsws (vector signed int, vector bool int);
vector signed int vec_vaddsws (vector signed int, vector signed int);
vector unsigned int vec_vadduws (vector bool int, vector unsigned int);
vector unsigned int vec_vadduws (vector unsigned int, vector bool int);
vector unsigned int vec_vadduws (vector unsigned int,
vector unsigned int);
vector signed short vec_vaddshs (vector bool short,
vector signed short);
vector signed short vec_vaddshs (vector signed short,
vector bool short);
vector signed short vec_vaddshs (vector signed short,
vector signed short);
vector unsigned short vec_vadduhs (vector bool short,
vector unsigned short);
vector unsigned short vec_vadduhs (vector unsigned short,
vector bool short);
vector unsigned short vec_vadduhs (vector unsigned short,
vector unsigned short);
vector signed char vec_vaddsbs (vector bool char, vector signed char);
vector signed char vec_vaddsbs (vector signed char, vector bool char);
vector signed char vec_vaddsbs (vector signed char, vector signed char);
vector unsigned char vec_vaddubs (vector bool char,
vector unsigned char);
vector unsigned char vec_vaddubs (vector unsigned char,
vector bool char);
vector unsigned char vec_vaddubs (vector unsigned char,
vector unsigned char);
vector float vec_and (vector float, vector float);
vector float vec_and (vector float, vector bool int);
vector float vec_and (vector bool int, vector float);
vector bool int vec_and (vector bool int, vector bool int);
vector signed int vec_and (vector bool int, vector signed int);
vector signed int vec_and (vector signed int, vector bool int);
vector signed int vec_and (vector signed int, vector signed int);
vector unsigned int vec_and (vector bool int, vector unsigned int);
vector unsigned int vec_and (vector unsigned int, vector bool int);
vector unsigned int vec_and (vector unsigned int, vector unsigned int);
vector bool short vec_and (vector bool short, vector bool short);
vector signed short vec_and (vector bool short, vector signed short);
vector signed short vec_and (vector signed short, vector bool short);
vector signed short vec_and (vector signed short, vector signed short);
vector unsigned short vec_and (vector bool short,
vector unsigned short);
vector unsigned short vec_and (vector unsigned short,
vector bool short);
vector unsigned short vec_and (vector unsigned short,
vector unsigned short);
vector signed char vec_and (vector bool char, vector signed char);
vector bool char vec_and (vector bool char, vector bool char);
vector signed char vec_and (vector signed char, vector bool char);
vector signed char vec_and (vector signed char, vector signed char);
vector unsigned char vec_and (vector bool char, vector unsigned char);
vector unsigned char vec_and (vector unsigned char, vector bool char);
vector unsigned char vec_and (vector unsigned char,
vector unsigned char);
vector float vec_andc (vector float, vector float);
vector float vec_andc (vector float, vector bool int);
vector float vec_andc (vector bool int, vector float);
vector bool int vec_andc (vector bool int, vector bool int);
vector signed int vec_andc (vector bool int, vector signed int);
vector signed int vec_andc (vector signed int, vector bool int);
vector signed int vec_andc (vector signed int, vector signed int);
vector unsigned int vec_andc (vector bool int, vector unsigned int);
vector unsigned int vec_andc (vector unsigned int, vector bool int);
vector unsigned int vec_andc (vector unsigned int, vector unsigned int);
vector bool short vec_andc (vector bool short, vector bool short);
vector signed short vec_andc (vector bool short, vector signed short);
vector signed short vec_andc (vector signed short, vector bool short);
vector signed short vec_andc (vector signed short, vector signed short);
vector unsigned short vec_andc (vector bool short,
vector unsigned short);
vector unsigned short vec_andc (vector unsigned short,
vector bool short);
vector unsigned short vec_andc (vector unsigned short,
vector unsigned short);
vector signed char vec_andc (vector bool char, vector signed char);
vector bool char vec_andc (vector bool char, vector bool char);
vector signed char vec_andc (vector signed char, vector bool char);
vector signed char vec_andc (vector signed char, vector signed char);
vector unsigned char vec_andc (vector bool char, vector unsigned char);
vector unsigned char vec_andc (vector unsigned char, vector bool char);
vector unsigned char vec_andc (vector unsigned char,
vector unsigned char);
vector unsigned char vec_avg (vector unsigned char,
vector unsigned char);
vector signed char vec_avg (vector signed char, vector signed char);
vector unsigned short vec_avg (vector unsigned short,
vector unsigned short);
vector signed short vec_avg (vector signed short, vector signed short);
vector unsigned int vec_avg (vector unsigned int, vector unsigned int);
vector signed int vec_avg (vector signed int, vector signed int);
vector signed int vec_vavgsw (vector signed int, vector signed int);
vector unsigned int vec_vavguw (vector unsigned int,
vector unsigned int);
vector signed short vec_vavgsh (vector signed short,
vector signed short);
vector unsigned short vec_vavguh (vector unsigned short,
vector unsigned short);
vector signed char vec_vavgsb (vector signed char, vector signed char);
vector unsigned char vec_vavgub (vector unsigned char,
vector unsigned char);
vector float vec_ceil (vector float);
vector signed int vec_cmpb (vector float, vector float);
vector bool char vec_cmpeq (vector signed char, vector signed char);
vector bool char vec_cmpeq (vector unsigned char, vector unsigned char);
vector bool short vec_cmpeq (vector signed short, vector signed short);
vector bool short vec_cmpeq (vector unsigned short,
vector unsigned short);
vector bool int vec_cmpeq (vector signed int, vector signed int);
vector bool int vec_cmpeq (vector unsigned int, vector unsigned int);
vector bool int vec_cmpeq (vector float, vector float);
vector bool int vec_vcmpeqfp (vector float, vector float);
vector bool int vec_vcmpequw (vector signed int, vector signed int);
vector bool int vec_vcmpequw (vector unsigned int, vector unsigned int);
vector bool short vec_vcmpequh (vector signed short,
vector signed short);
vector bool short vec_vcmpequh (vector unsigned short,
vector unsigned short);
vector bool char vec_vcmpequb (vector signed char, vector signed char);
vector bool char vec_vcmpequb (vector unsigned char,
vector unsigned char);
vector bool int vec_cmpge (vector float, vector float);
vector bool char vec_cmpgt (vector unsigned char, vector unsigned char);
vector bool char vec_cmpgt (vector signed char, vector signed char);
vector bool short vec_cmpgt (vector unsigned short,
vector unsigned short);
vector bool short vec_cmpgt (vector signed short, vector signed short);
vector bool int vec_cmpgt (vector unsigned int, vector unsigned int);
vector bool int vec_cmpgt (vector signed int, vector signed int);
vector bool int vec_cmpgt (vector float, vector float);
vector bool int vec_vcmpgtfp (vector float, vector float);
vector bool int vec_vcmpgtsw (vector signed int, vector signed int);
vector bool int vec_vcmpgtuw (vector unsigned int, vector unsigned int);
vector bool short vec_vcmpgtsh (vector signed short,
vector signed short);
vector bool short vec_vcmpgtuh (vector unsigned short,
vector unsigned short);
vector bool char vec_vcmpgtsb (vector signed char, vector signed char);
vector bool char vec_vcmpgtub (vector unsigned char,
vector unsigned char);
vector bool int vec_cmple (vector float, vector float);
vector bool char vec_cmplt (vector unsigned char, vector unsigned char);
vector bool char vec_cmplt (vector signed char, vector signed char);
vector bool short vec_cmplt (vector unsigned short,
vector unsigned short);
vector bool short vec_cmplt (vector signed short, vector signed short);
vector bool int vec_cmplt (vector unsigned int, vector unsigned int);
vector bool int vec_cmplt (vector signed int, vector signed int);
vector bool int vec_cmplt (vector float, vector float);
vector float vec_ctf (vector unsigned int, const int);
vector float vec_ctf (vector signed int, const int);
vector float vec_vcfsx (vector signed int, const int);
vector float vec_vcfux (vector unsigned int, const int);
vector signed int vec_cts (vector float, const int);
vector unsigned int vec_ctu (vector float, const int);
void vec_dss (const int);
void vec_dssall (void);
void vec_dst (const vector unsigned char *, int, const int);
void vec_dst (const vector signed char *, int, const int);
void vec_dst (const vector bool char *, int, const int);
void vec_dst (const vector unsigned short *, int, const int);
void vec_dst (const vector signed short *, int, const int);
void vec_dst (const vector bool short *, int, const int);
void vec_dst (const vector pixel *, int, const int);
void vec_dst (const vector unsigned int *, int, const int);
void vec_dst (const vector signed int *, int, const int);
void vec_dst (const vector bool int *, int, const int);
void vec_dst (const vector float *, int, const int);
void vec_dst (const unsigned char *, int, const int);
void vec_dst (const signed char *, int, const int);
void vec_dst (const unsigned short *, int, const int);
void vec_dst (const short *, int, const int);
void vec_dst (const unsigned int *, int, const int);
void vec_dst (const int *, int, const int);
void vec_dst (const unsigned long *, int, const int);
void vec_dst (const long *, int, const int);
void vec_dst (const float *, int, const int);
void vec_dstst (const vector unsigned char *, int, const int);
void vec_dstst (const vector signed char *, int, const int);
void vec_dstst (const vector bool char *, int, const int);
void vec_dstst (const vector unsigned short *, int, const int);
void vec_dstst (const vector signed short *, int, const int);
void vec_dstst (const vector bool short *, int, const int);
void vec_dstst (const vector pixel *, int, const int);
void vec_dstst (const vector unsigned int *, int, const int);
void vec_dstst (const vector signed int *, int, const int);
void vec_dstst (const vector bool int *, int, const int);
void vec_dstst (const vector float *, int, const int);
void vec_dstst (const unsigned char *, int, const int);
void vec_dstst (const signed char *, int, const int);
void vec_dstst (const unsigned short *, int, const int);
void vec_dstst (const short *, int, const int);
void vec_dstst (const unsigned int *, int, const int);
void vec_dstst (const int *, int, const int);
void vec_dstst (const unsigned long *, int, const int);
void vec_dstst (const long *, int, const int);
void vec_dstst (const float *, int, const int);
void vec_dststt (const vector unsigned char *, int, const int);
void vec_dststt (const vector signed char *, int, const int);
void vec_dststt (const vector bool char *, int, const int);
void vec_dststt (const vector unsigned short *, int, const int);
void vec_dststt (const vector signed short *, int, const int);
void vec_dststt (const vector bool short *, int, const int);
void vec_dststt (const vector pixel *, int, const int);
void vec_dststt (const vector unsigned int *, int, const int);
void vec_dststt (const vector signed int *, int, const int);
void vec_dststt (const vector bool int *, int, const int);
void vec_dststt (const vector float *, int, const int);
void vec_dststt (const unsigned char *, int, const int);
void vec_dststt (const signed char *, int, const int);
void vec_dststt (const unsigned short *, int, const int);
void vec_dststt (const short *, int, const int);
void vec_dststt (const unsigned int *, int, const int);
void vec_dststt (const int *, int, const int);
void vec_dststt (const unsigned long *, int, const int);
void vec_dststt (const long *, int, const int);
void vec_dststt (const float *, int, const int);
void vec_dstt (const vector unsigned char *, int, const int);
void vec_dstt (const vector signed char *, int, const int);
void vec_dstt (const vector bool char *, int, const int);
void vec_dstt (const vector unsigned short *, int, const int);
void vec_dstt (const vector signed short *, int, const int);
void vec_dstt (const vector bool short *, int, const int);
void vec_dstt (const vector pixel *, int, const int);
void vec_dstt (const vector unsigned int *, int, const int);
void vec_dstt (const vector signed int *, int, const int);
void vec_dstt (const vector bool int *, int, const int);
void vec_dstt (const vector float *, int, const int);
void vec_dstt (const unsigned char *, int, const int);
void vec_dstt (const signed char *, int, const int);
void vec_dstt (const unsigned short *, int, const int);
void vec_dstt (const short *, int, const int);
void vec_dstt (const unsigned int *, int, const int);
void vec_dstt (const int *, int, const int);
void vec_dstt (const unsigned long *, int, const int);
void vec_dstt (const long *, int, const int);
void vec_dstt (const float *, int, const int);
vector float vec_expte (vector float);
vector float vec_floor (vector float);
vector float vec_ld (int, const vector float *);
vector float vec_ld (int, const float *);
vector bool int vec_ld (int, const vector bool int *);
vector signed int vec_ld (int, const vector signed int *);
vector signed int vec_ld (int, const int *);
vector signed int vec_ld (int, const long *);
vector unsigned int vec_ld (int, const vector unsigned int *);
vector unsigned int vec_ld (int, const unsigned int *);
vector unsigned int vec_ld (int, const unsigned long *);
vector bool short vec_ld (int, const vector bool short *);
vector pixel vec_ld (int, const vector pixel *);
vector signed short vec_ld (int, const vector signed short *);
vector signed short vec_ld (int, const short *);
vector unsigned short vec_ld (int, const vector unsigned short *);
vector unsigned short vec_ld (int, const unsigned short *);
vector bool char vec_ld (int, const vector bool char *);
vector signed char vec_ld (int, const vector signed char *);
vector signed char vec_ld (int, const signed char *);
vector unsigned char vec_ld (int, const vector unsigned char *);
vector unsigned char vec_ld (int, const unsigned char *);
vector signed char vec_lde (int, const signed char *);
vector unsigned char vec_lde (int, const unsigned char *);
vector signed short vec_lde (int, const short *);
vector unsigned short vec_lde (int, const unsigned short *);
vector float vec_lde (int, const float *);
vector signed int vec_lde (int, const int *);
vector unsigned int vec_lde (int, const unsigned int *);
vector signed int vec_lde (int, const long *);
vector unsigned int vec_lde (int, const unsigned long *);
vector float vec_lvewx (int, float *);
vector signed int vec_lvewx (int, int *);
vector unsigned int vec_lvewx (int, unsigned int *);
vector signed int vec_lvewx (int, long *);
vector unsigned int vec_lvewx (int, unsigned long *);
vector signed short vec_lvehx (int, short *);
vector unsigned short vec_lvehx (int, unsigned short *);
vector signed char vec_lvebx (int, char *);
vector unsigned char vec_lvebx (int, unsigned char *);
vector float vec_ldl (int, const vector float *);
vector float vec_ldl (int, const float *);
vector bool int vec_ldl (int, const vector bool int *);
vector signed int vec_ldl (int, const vector signed int *);
vector signed int vec_ldl (int, const int *);
vector signed int vec_ldl (int, const long *);
vector unsigned int vec_ldl (int, const vector unsigned int *);
vector unsigned int vec_ldl (int, const unsigned int *);
vector unsigned int vec_ldl (int, const unsigned long *);
vector bool short vec_ldl (int, const vector bool short *);
vector pixel vec_ldl (int, const vector pixel *);
vector signed short vec_ldl (int, const vector signed short *);
vector signed short vec_ldl (int, const short *);
vector unsigned short vec_ldl (int, const vector unsigned short *);
vector unsigned short vec_ldl (int, const unsigned short *);
vector bool char vec_ldl (int, const vector bool char *);
vector signed char vec_ldl (int, const vector signed char *);
vector signed char vec_ldl (int, const signed char *);
vector unsigned char vec_ldl (int, const vector unsigned char *);
vector unsigned char vec_ldl (int, const unsigned char *);
vector float vec_loge (vector float);
vector unsigned char vec_lvsl (int, const volatile unsigned char *);
vector unsigned char vec_lvsl (int, const volatile signed char *);
vector unsigned char vec_lvsl (int, const volatile unsigned short *);
vector unsigned char vec_lvsl (int, const volatile short *);
vector unsigned char vec_lvsl (int, const volatile unsigned int *);
vector unsigned char vec_lvsl (int, const volatile int *);
vector unsigned char vec_lvsl (int, const volatile unsigned long *);
vector unsigned char vec_lvsl (int, const volatile long *);
vector unsigned char vec_lvsl (int, const volatile float *);
vector unsigned char vec_lvsr (int, const volatile unsigned char *);
vector unsigned char vec_lvsr (int, const volatile signed char *);
vector unsigned char vec_lvsr (int, const volatile unsigned short *);
vector unsigned char vec_lvsr (int, const volatile short *);
vector unsigned char vec_lvsr (int, const volatile unsigned int *);
vector unsigned char vec_lvsr (int, const volatile int *);
vector unsigned char vec_lvsr (int, const volatile unsigned long *);
vector unsigned char vec_lvsr (int, const volatile long *);
vector unsigned char vec_lvsr (int, const volatile float *);
vector float vec_madd (vector float, vector float, vector float);
vector signed short vec_madds (vector signed short,
vector signed short,
vector signed short);
vector unsigned char vec_max (vector bool char, vector unsigned char);
vector unsigned char vec_max (vector unsigned char, vector bool char);
vector unsigned char vec_max (vector unsigned char,
vector unsigned char);
vector signed char vec_max (vector bool char, vector signed char);
vector signed char vec_max (vector signed char, vector bool char);
vector signed char vec_max (vector signed char, vector signed char);
vector unsigned short vec_max (vector bool short,
vector unsigned short);
vector unsigned short vec_max (vector unsigned short,
vector bool short);
vector unsigned short vec_max (vector unsigned short,
vector unsigned short);
vector signed short vec_max (vector bool short, vector signed short);
vector signed short vec_max (vector signed short, vector bool short);
vector signed short vec_max (vector signed short, vector signed short);
vector unsigned int vec_max (vector bool int, vector unsigned int);
vector unsigned int vec_max (vector unsigned int, vector bool int);
vector unsigned int vec_max (vector unsigned int, vector unsigned int);
vector signed int vec_max (vector bool int, vector signed int);
vector signed int vec_max (vector signed int, vector bool int);
vector signed int vec_max (vector signed int, vector signed int);
vector float vec_max (vector float, vector float);
vector float vec_vmaxfp (vector float, vector float);
vector signed int vec_vmaxsw (vector bool int, vector signed int);
vector signed int vec_vmaxsw (vector signed int, vector bool int);
vector signed int vec_vmaxsw (vector signed int, vector signed int);
vector unsigned int vec_vmaxuw (vector bool int, vector unsigned int);
vector unsigned int vec_vmaxuw (vector unsigned int, vector bool int);
vector unsigned int vec_vmaxuw (vector unsigned int,
vector unsigned int);
vector signed short vec_vmaxsh (vector bool short, vector signed short);
vector signed short vec_vmaxsh (vector signed short, vector bool short);
vector signed short vec_vmaxsh (vector signed short,
vector signed short);
vector unsigned short vec_vmaxuh (vector bool short,
vector unsigned short);
vector unsigned short vec_vmaxuh (vector unsigned short,
vector bool short);
vector unsigned short vec_vmaxuh (vector unsigned short,
vector unsigned short);
vector signed char vec_vmaxsb (vector bool char, vector signed char);
vector signed char vec_vmaxsb (vector signed char, vector bool char);
vector signed char vec_vmaxsb (vector signed char, vector signed char);
vector unsigned char vec_vmaxub (vector bool char,
vector unsigned char);
vector unsigned char vec_vmaxub (vector unsigned char,
vector bool char);
vector unsigned char vec_vmaxub (vector unsigned char,
vector unsigned char);
vector bool char vec_mergeh (vector bool char, vector bool char);
vector signed char vec_mergeh (vector signed char, vector signed char);
vector unsigned char vec_mergeh (vector unsigned char,
vector unsigned char);
vector bool short vec_mergeh (vector bool short, vector bool short);
vector pixel vec_mergeh (vector pixel, vector pixel);
vector signed short vec_mergeh (vector signed short,
vector signed short);
vector unsigned short vec_mergeh (vector unsigned short,
vector unsigned short);
vector float vec_mergeh (vector float, vector float);
vector bool int vec_mergeh (vector bool int, vector bool int);
vector signed int vec_mergeh (vector signed int, vector signed int);
vector unsigned int vec_mergeh (vector unsigned int,
vector unsigned int);
vector float vec_vmrghw (vector float, vector float);
vector bool int vec_vmrghw (vector bool int, vector bool int);
vector signed int vec_vmrghw (vector signed int, vector signed int);
vector unsigned int vec_vmrghw (vector unsigned int,
vector unsigned int);
vector bool short vec_vmrghh (vector bool short, vector bool short);
vector signed short vec_vmrghh (vector signed short,
vector signed short);
vector unsigned short vec_vmrghh (vector unsigned short,
vector unsigned short);
vector pixel vec_vmrghh (vector pixel, vector pixel);
vector bool char vec_vmrghb (vector bool char, vector bool char);
vector signed char vec_vmrghb (vector signed char, vector signed char);
vector unsigned char vec_vmrghb (vector unsigned char,
vector unsigned char);
vector bool char vec_mergel (vector bool char, vector bool char);
vector signed char vec_mergel (vector signed char, vector signed char);
vector unsigned char vec_mergel (vector unsigned char,
vector unsigned char);
vector bool short vec_mergel (vector bool short, vector bool short);
vector pixel vec_mergel (vector pixel, vector pixel);
vector signed short vec_mergel (vector signed short,
vector signed short);
vector unsigned short vec_mergel (vector unsigned short,
vector unsigned short);
vector float vec_mergel (vector float, vector float);
vector bool int vec_mergel (vector bool int, vector bool int);
vector signed int vec_mergel (vector signed int, vector signed int);
vector unsigned int vec_mergel (vector unsigned int,
vector unsigned int);
vector float vec_vmrglw (vector float, vector float);
vector signed int vec_vmrglw (vector signed int, vector signed int);
vector unsigned int vec_vmrglw (vector unsigned int,
vector unsigned int);
vector bool int vec_vmrglw (vector bool int, vector bool int);
vector bool short vec_vmrglh (vector bool short, vector bool short);
vector signed short vec_vmrglh (vector signed short,
vector signed short);
vector unsigned short vec_vmrglh (vector unsigned short,
vector unsigned short);
vector pixel vec_vmrglh (vector pixel, vector pixel);
vector bool char vec_vmrglb (vector bool char, vector bool char);
vector signed char vec_vmrglb (vector signed char, vector signed char);
vector unsigned char vec_vmrglb (vector unsigned char,
vector unsigned char);
vector unsigned short vec_mfvscr (void);
vector unsigned char vec_min (vector bool char, vector unsigned char);
vector unsigned char vec_min (vector unsigned char, vector bool char);
vector unsigned char vec_min (vector unsigned char,
vector unsigned char);
vector signed char vec_min (vector bool char, vector signed char);
vector signed char vec_min (vector signed char, vector bool char);
vector signed char vec_min (vector signed char, vector signed char);
vector unsigned short vec_min (vector bool short,
vector unsigned short);
vector unsigned short vec_min (vector unsigned short,
vector bool short);
vector unsigned short vec_min (vector unsigned short,
vector unsigned short);
vector signed short vec_min (vector bool short, vector signed short);
vector signed short vec_min (vector signed short, vector bool short);
vector signed short vec_min (vector signed short, vector signed short);
vector unsigned int vec_min (vector bool int, vector unsigned int);
vector unsigned int vec_min (vector unsigned int, vector bool int);
vector unsigned int vec_min (vector unsigned int, vector unsigned int);
vector signed int vec_min (vector bool int, vector signed int);
vector signed int vec_min (vector signed int, vector bool int);
vector signed int vec_min (vector signed int, vector signed int);
vector float vec_min (vector float, vector float);
vector float vec_vminfp (vector float, vector float);
vector signed int vec_vminsw (vector bool int, vector signed int);
vector signed int vec_vminsw (vector signed int, vector bool int);
vector signed int vec_vminsw (vector signed int, vector signed int);
vector unsigned int vec_vminuw (vector bool int, vector unsigned int);
vector unsigned int vec_vminuw (vector unsigned int, vector bool int);
vector unsigned int vec_vminuw (vector unsigned int,
vector unsigned int);
vector signed short vec_vminsh (vector bool short, vector signed short);
vector signed short vec_vminsh (vector signed short, vector bool short);
vector signed short vec_vminsh (vector signed short,
vector signed short);
vector unsigned short vec_vminuh (vector bool short,
vector unsigned short);
vector unsigned short vec_vminuh (vector unsigned short,
vector bool short);
vector unsigned short vec_vminuh (vector unsigned short,
vector unsigned short);
vector signed char vec_vminsb (vector bool char, vector signed char);
vector signed char vec_vminsb (vector signed char, vector bool char);
vector signed char vec_vminsb (vector signed char, vector signed char);
vector unsigned char vec_vminub (vector bool char,
vector unsigned char);
vector unsigned char vec_vminub (vector unsigned char,
vector bool char);
vector unsigned char vec_vminub (vector unsigned char,
vector unsigned char);
vector signed short vec_mladd (vector signed short,
vector signed short,
vector signed short);
vector signed short vec_mladd (vector signed short,
vector unsigned short,
vector unsigned short);
vector signed short vec_mladd (vector unsigned short,
vector signed short,
vector signed short);
vector unsigned short vec_mladd (vector unsigned short,
vector unsigned short,
vector unsigned short);
vector signed short vec_mradds (vector signed short,
vector signed short,
vector signed short);
vector unsigned int vec_msum (vector unsigned char,
vector unsigned char,
vector unsigned int);
vector signed int vec_msum (vector signed char,
vector unsigned char,
vector signed int);
vector unsigned int vec_msum (vector unsigned short,
vector unsigned short,
vector unsigned int);
vector signed int vec_msum (vector signed short,
vector signed short,
vector signed int);
vector signed int vec_vmsumshm (vector signed short,
vector signed short,
vector signed int);
vector unsigned int vec_vmsumuhm (vector unsigned short,
vector unsigned short,
vector unsigned int);
vector signed int vec_vmsummbm (vector signed char,
vector unsigned char,
vector signed int);
vector unsigned int vec_vmsumubm (vector unsigned char,
vector unsigned char,
vector unsigned int);
vector unsigned int vec_msums (vector unsigned short,
vector unsigned short,
vector unsigned int);
vector signed int vec_msums (vector signed short,
vector signed short,
vector signed int);
vector signed int vec_vmsumshs (vector signed short,
vector signed short,
vector signed int);
vector unsigned int vec_vmsumuhs (vector unsigned short,
vector unsigned short,
vector unsigned int);
void vec_mtvscr (vector signed int);
void vec_mtvscr (vector unsigned int);
void vec_mtvscr (vector bool int);
void vec_mtvscr (vector signed short);
void vec_mtvscr (vector unsigned short);
void vec_mtvscr (vector bool short);
void vec_mtvscr (vector pixel);
void vec_mtvscr (vector signed char);
void vec_mtvscr (vector unsigned char);
void vec_mtvscr (vector bool char);
vector unsigned short vec_mule (vector unsigned char,
vector unsigned char);
vector signed short vec_mule (vector signed char,
vector signed char);
vector unsigned int vec_mule (vector unsigned short,
vector unsigned short);
vector signed int vec_mule (vector signed short, vector signed short);
vector signed int vec_vmulesh (vector signed short,
vector signed short);
vector unsigned int vec_vmuleuh (vector unsigned short,
vector unsigned short);
vector signed short vec_vmulesb (vector signed char,
vector signed char);
vector unsigned short vec_vmuleub (vector unsigned char,
vector unsigned char);
vector unsigned short vec_mulo (vector unsigned char,
vector unsigned char);
vector signed short vec_mulo (vector signed char, vector signed char);
vector unsigned int vec_mulo (vector unsigned short,
vector unsigned short);
vector signed int vec_mulo (vector signed short, vector signed short);
vector signed int vec_vmulosh (vector signed short,
vector signed short);
vector unsigned int vec_vmulouh (vector unsigned short,
vector unsigned short);
vector signed short vec_vmulosb (vector signed char,
vector signed char);
vector unsigned short vec_vmuloub (vector unsigned char,
vector unsigned char);
vector float vec_nmsub (vector float, vector float, vector float);
vector float vec_nor (vector float, vector float);
vector signed int vec_nor (vector signed int, vector signed int);
vector unsigned int vec_nor (vector unsigned int, vector unsigned int);
vector bool int vec_nor (vector bool int, vector bool int);
vector signed short vec_nor (vector signed short, vector signed short);
vector unsigned short vec_nor (vector unsigned short,
vector unsigned short);
vector bool short vec_nor (vector bool short, vector bool short);
vector signed char vec_nor (vector signed char, vector signed char);
vector unsigned char vec_nor (vector unsigned char,
vector unsigned char);
vector bool char vec_nor (vector bool char, vector bool char);
vector float vec_or (vector float, vector float);
vector float vec_or (vector float, vector bool int);
vector float vec_or (vector bool int, vector float);
vector bool int vec_or (vector bool int, vector bool int);
vector signed int vec_or (vector bool int, vector signed int);
vector signed int vec_or (vector signed int, vector bool int);
vector signed int vec_or (vector signed int, vector signed int);
vector unsigned int vec_or (vector bool int, vector unsigned int);
vector unsigned int vec_or (vector unsigned int, vector bool int);
vector unsigned int vec_or (vector unsigned int, vector unsigned int);
vector bool short vec_or (vector bool short, vector bool short);
vector signed short vec_or (vector bool short, vector signed short);
vector signed short vec_or (vector signed short, vector bool short);
vector signed short vec_or (vector signed short, vector signed short);
vector unsigned short vec_or (vector bool short, vector unsigned short);
vector unsigned short vec_or (vector unsigned short, vector bool short);
vector unsigned short vec_or (vector unsigned short,
vector unsigned short);
vector signed char vec_or (vector bool char, vector signed char);
vector bool char vec_or (vector bool char, vector bool char);
vector signed char vec_or (vector signed char, vector bool char);
vector signed char vec_or (vector signed char, vector signed char);
vector unsigned char vec_or (vector bool char, vector unsigned char);
vector unsigned char vec_or (vector unsigned char, vector bool char);
vector unsigned char vec_or (vector unsigned char,
vector unsigned char);
vector signed char vec_pack (vector signed short, vector signed short);
vector unsigned char vec_pack (vector unsigned short,
vector unsigned short);
vector bool char vec_pack (vector bool short, vector bool short);
vector signed short vec_pack (vector signed int, vector signed int);
vector unsigned short vec_pack (vector unsigned int,
vector unsigned int);
vector bool short vec_pack (vector bool int, vector bool int);
vector bool short vec_vpkuwum (vector bool int, vector bool int);
vector signed short vec_vpkuwum (vector signed int, vector signed int);
vector unsigned short vec_vpkuwum (vector unsigned int,
vector unsigned int);
vector bool char vec_vpkuhum (vector bool short, vector bool short);
vector signed char vec_vpkuhum (vector signed short,
vector signed short);
vector unsigned char vec_vpkuhum (vector unsigned short,
vector unsigned short);
vector pixel vec_packpx (vector unsigned int, vector unsigned int);
vector unsigned char vec_packs (vector unsigned short,
vector unsigned short);
vector signed char vec_packs (vector signed short, vector signed short);
vector unsigned short vec_packs (vector unsigned int,
vector unsigned int);
vector signed short vec_packs (vector signed int, vector signed int);
vector signed short vec_vpkswss (vector signed int, vector signed int);
vector unsigned short vec_vpkuwus (vector unsigned int,
vector unsigned int);
vector signed char vec_vpkshss (vector signed short,
vector signed short);
vector unsigned char vec_vpkuhus (vector unsigned short,
vector unsigned short);
vector unsigned char vec_packsu (vector unsigned short,
vector unsigned short);
vector unsigned char vec_packsu (vector signed short,
vector signed short);
vector unsigned short vec_packsu (vector unsigned int,
vector unsigned int);
vector unsigned short vec_packsu (vector signed int, vector signed int);
vector unsigned short vec_vpkswus (vector signed int,
vector signed int);
vector unsigned char vec_vpkshus (vector signed short,
vector signed short);
vector float vec_perm (vector float,
vector float,
vector unsigned char);
vector signed int vec_perm (vector signed int,
vector signed int,
vector unsigned char);
vector unsigned int vec_perm (vector unsigned int,
vector unsigned int,
vector unsigned char);
vector bool int vec_perm (vector bool int,
vector bool int,
vector unsigned char);
vector signed short vec_perm (vector signed short,
vector signed short,
vector unsigned char);
vector unsigned short vec_perm (vector unsigned short,
vector unsigned short,
vector unsigned char);
vector bool short vec_perm (vector bool short,
vector bool short,
vector unsigned char);
vector pixel vec_perm (vector pixel,
vector pixel,
vector unsigned char);
vector signed char vec_perm (vector signed char,
vector signed char,
vector unsigned char);
vector unsigned char vec_perm (vector unsigned char,
vector unsigned char,
vector unsigned char);
vector bool char vec_perm (vector bool char,
vector bool char,
vector unsigned char);
vector float vec_re (vector float);
vector signed char vec_rl (vector signed char,
vector unsigned char);
vector unsigned char vec_rl (vector unsigned char,
vector unsigned char);
vector signed short vec_rl (vector signed short, vector unsigned short);
vector unsigned short vec_rl (vector unsigned short,
vector unsigned short);
vector signed int vec_rl (vector signed int, vector unsigned int);
vector unsigned int vec_rl (vector unsigned int, vector unsigned int);
vector signed int vec_vrlw (vector signed int, vector unsigned int);
vector unsigned int vec_vrlw (vector unsigned int, vector unsigned int);
vector signed short vec_vrlh (vector signed short,
vector unsigned short);
vector unsigned short vec_vrlh (vector unsigned short,
vector unsigned short);
vector signed char vec_vrlb (vector signed char, vector unsigned char);
vector unsigned char vec_vrlb (vector unsigned char,
vector unsigned char);
vector float vec_round (vector float);
vector float vec_rsqrte (vector float);
vector float vec_sel (vector float, vector float, vector bool int);
vector float vec_sel (vector float, vector float, vector unsigned int);
vector signed int vec_sel (vector signed int,
vector signed int,
vector bool int);
vector signed int vec_sel (vector signed int,
vector signed int,
vector unsigned int);
vector unsigned int vec_sel (vector unsigned int,
vector unsigned int,
vector bool int);
vector unsigned int vec_sel (vector unsigned int,
vector unsigned int,
vector unsigned int);
vector bool int vec_sel (vector bool int,
vector bool int,
vector bool int);
vector bool int vec_sel (vector bool int,
vector bool int,
vector unsigned int);
vector signed short vec_sel (vector signed short,
vector signed short,
vector bool short);
vector signed short vec_sel (vector signed short,
vector signed short,
vector unsigned short);
vector unsigned short vec_sel (vector unsigned short,
vector unsigned short,
vector bool short);
vector unsigned short vec_sel (vector unsigned short,
vector unsigned short,
vector unsigned short);
vector bool short vec_sel (vector bool short,
vector bool short,
vector bool short);
vector bool short vec_sel (vector bool short,
vector bool short,
vector unsigned short);
vector signed char vec_sel (vector signed char,
vector signed char,
vector bool char);
vector signed char vec_sel (vector signed char,
vector signed char,
vector unsigned char);
vector unsigned char vec_sel (vector unsigned char,
vector unsigned char,
vector bool char);
vector unsigned char vec_sel (vector unsigned char,
vector unsigned char,
vector unsigned char);
vector bool char vec_sel (vector bool char,
vector bool char,
vector bool char);
vector bool char vec_sel (vector bool char,
vector bool char,
vector unsigned char);
vector signed char vec_sl (vector signed char,
vector unsigned char);
vector unsigned char vec_sl (vector unsigned char,
vector unsigned char);
vector signed short vec_sl (vector signed short, vector unsigned short);
vector unsigned short vec_sl (vector unsigned short,
vector unsigned short);
vector signed int vec_sl (vector signed int, vector unsigned int);
vector unsigned int vec_sl (vector unsigned int, vector unsigned int);
vector signed int vec_vslw (vector signed int, vector unsigned int);
vector unsigned int vec_vslw (vector unsigned int, vector unsigned int);
vector signed short vec_vslh (vector signed short,
vector unsigned short);
vector unsigned short vec_vslh (vector unsigned short,
vector unsigned short);
vector signed char vec_vslb (vector signed char, vector unsigned char);
vector unsigned char vec_vslb (vector unsigned char,
vector unsigned char);
vector float vec_sld (vector float, vector float, const int);
vector signed int vec_sld (vector signed int,
vector signed int,
const int);
vector unsigned int vec_sld (vector unsigned int,
vector unsigned int,
const int);
vector bool int vec_sld (vector bool int,
vector bool int,
const int);
vector signed short vec_sld (vector signed short,
vector signed short,
const int);
vector unsigned short vec_sld (vector unsigned short,
vector unsigned short,
const int);
vector bool short vec_sld (vector bool short,
vector bool short,
const int);
vector pixel vec_sld (vector pixel,
vector pixel,
const int);
vector signed char vec_sld (vector signed char,
vector signed char,
const int);
vector unsigned char vec_sld (vector unsigned char,
vector unsigned char,
const int);
vector bool char vec_sld (vector bool char,
vector bool char,
const int);
vector signed int vec_sll (vector signed int,
vector unsigned int);
vector signed int vec_sll (vector signed int,
vector unsigned short);
vector signed int vec_sll (vector signed int,
vector unsigned char);
vector unsigned int vec_sll (vector unsigned int,
vector unsigned int);
vector unsigned int vec_sll (vector unsigned int,
vector unsigned short);
vector unsigned int vec_sll (vector unsigned int,
vector unsigned char);
vector bool int vec_sll (vector bool int,
vector unsigned int);
vector bool int vec_sll (vector bool int,
vector unsigned short);
vector bool int vec_sll (vector bool int,
vector unsigned char);
vector signed short vec_sll (vector signed short,
vector unsigned int);
vector signed short vec_sll (vector signed short,
vector unsigned short);
vector signed short vec_sll (vector signed short,
vector unsigned char);
vector unsigned short vec_sll (vector unsigned short,
vector unsigned int);
vector unsigned short vec_sll (vector unsigned short,
vector unsigned short);
vector unsigned short vec_sll (vector unsigned short,
vector unsigned char);
vector bool short vec_sll (vector bool short, vector unsigned int);
vector bool short vec_sll (vector bool short, vector unsigned short);
vector bool short vec_sll (vector bool short, vector unsigned char);
vector pixel vec_sll (vector pixel, vector unsigned int);
vector pixel vec_sll (vector pixel, vector unsigned short);
vector pixel vec_sll (vector pixel, vector unsigned char);
vector signed char vec_sll (vector signed char, vector unsigned int);
vector signed char vec_sll (vector signed char, vector unsigned short);
vector signed char vec_sll (vector signed char, vector unsigned char);
vector unsigned char vec_sll (vector unsigned char,
vector unsigned int);
vector unsigned char vec_sll (vector unsigned char,
vector unsigned short);
vector unsigned char vec_sll (vector unsigned char,
vector unsigned char);
vector bool char vec_sll (vector bool char, vector unsigned int);
vector bool char vec_sll (vector bool char, vector unsigned short);
vector bool char vec_sll (vector bool char, vector unsigned char);
vector float vec_slo (vector float, vector signed char);
vector float vec_slo (vector float, vector unsigned char);
vector signed int vec_slo (vector signed int, vector signed char);
vector signed int vec_slo (vector signed int, vector unsigned char);
vector unsigned int vec_slo (vector unsigned int, vector signed char);
vector unsigned int vec_slo (vector unsigned int, vector unsigned char);
vector signed short vec_slo (vector signed short, vector signed char);
vector signed short vec_slo (vector signed short, vector unsigned char);
vector unsigned short vec_slo (vector unsigned short,
vector signed char);
vector unsigned short vec_slo (vector unsigned short,
vector unsigned char);
vector pixel vec_slo (vector pixel, vector signed char);
vector pixel vec_slo (vector pixel, vector unsigned char);
vector signed char vec_slo (vector signed char, vector signed char);
vector signed char vec_slo (vector signed char, vector unsigned char);
vector unsigned char vec_slo (vector unsigned char, vector signed char);
vector unsigned char vec_slo (vector unsigned char,
vector unsigned char);
vector signed char vec_splat (vector signed char, const int);
vector unsigned char vec_splat (vector unsigned char, const int);
vector bool char vec_splat (vector bool char, const int);
vector signed short vec_splat (vector signed short, const int);
vector unsigned short vec_splat (vector unsigned short, const int);
vector bool short vec_splat (vector bool short, const int);
vector pixel vec_splat (vector pixel, const int);
vector float vec_splat (vector float, const int);
vector signed int vec_splat (vector signed int, const int);
vector unsigned int vec_splat (vector unsigned int, const int);
vector bool int vec_splat (vector bool int, const int);
vector float vec_vspltw (vector float, const int);
vector signed int vec_vspltw (vector signed int, const int);
vector unsigned int vec_vspltw (vector unsigned int, const int);
vector bool int vec_vspltw (vector bool int, const int);
vector bool short vec_vsplth (vector bool short, const int);
vector signed short vec_vsplth (vector signed short, const int);
vector unsigned short vec_vsplth (vector unsigned short, const int);
vector pixel vec_vsplth (vector pixel, const int);
vector signed char vec_vspltb (vector signed char, const int);
vector unsigned char vec_vspltb (vector unsigned char, const int);
vector bool char vec_vspltb (vector bool char, const int);
vector signed char vec_splat_s8 (const int);
vector signed short vec_splat_s16 (const int);
vector signed int vec_splat_s32 (const int);
vector unsigned char vec_splat_u8 (const int);
vector unsigned short vec_splat_u16 (const int);
vector unsigned int vec_splat_u32 (const int);
vector signed char vec_sr (vector signed char, vector unsigned char);
vector unsigned char vec_sr (vector unsigned char,
vector unsigned char);
vector signed short vec_sr (vector signed short,
vector unsigned short);
vector unsigned short vec_sr (vector unsigned short,
vector unsigned short);
vector signed int vec_sr (vector signed int, vector unsigned int);
vector unsigned int vec_sr (vector unsigned int, vector unsigned int);
vector signed int vec_vsrw (vector signed int, vector unsigned int);
vector unsigned int vec_vsrw (vector unsigned int, vector unsigned int);
vector signed short vec_vsrh (vector signed short,
vector unsigned short);
vector unsigned short vec_vsrh (vector unsigned short,
vector unsigned short);
vector signed char vec_vsrb (vector signed char, vector unsigned char);
vector unsigned char vec_vsrb (vector unsigned char,
vector unsigned char);
vector signed char vec_sra (vector signed char, vector unsigned char);
vector unsigned char vec_sra (vector unsigned char,
vector unsigned char);
vector signed short vec_sra (vector signed short,
vector unsigned short);
vector unsigned short vec_sra (vector unsigned short,
vector unsigned short);
vector signed int vec_sra (vector signed int, vector unsigned int);
vector unsigned int vec_sra (vector unsigned int, vector unsigned int);
vector signed int vec_vsraw (vector signed int, vector unsigned int);
vector unsigned int vec_vsraw (vector unsigned int,
vector unsigned int);
vector signed short vec_vsrah (vector signed short,
vector unsigned short);
vector unsigned short vec_vsrah (vector unsigned short,
vector unsigned short);
vector signed char vec_vsrab (vector signed char, vector unsigned char);
vector unsigned char vec_vsrab (vector unsigned char,
vector unsigned char);
vector signed int vec_srl (vector signed int, vector unsigned int);
vector signed int vec_srl (vector signed int, vector unsigned short);
vector signed int vec_srl (vector signed int, vector unsigned char);
vector unsigned int vec_srl (vector unsigned int, vector unsigned int);
vector unsigned int vec_srl (vector unsigned int,
vector unsigned short);
vector unsigned int vec_srl (vector unsigned int, vector unsigned char);
vector bool int vec_srl (vector bool int, vector unsigned int);
vector bool int vec_srl (vector bool int, vector unsigned short);
vector bool int vec_srl (vector bool int, vector unsigned char);
vector signed short vec_srl (vector signed short, vector unsigned int);
vector signed short vec_srl (vector signed short,
vector unsigned short);
vector signed short vec_srl (vector signed short, vector unsigned char);
vector unsigned short vec_srl (vector unsigned short,
vector unsigned int);
vector unsigned short vec_srl (vector unsigned short,
vector unsigned short);
vector unsigned short vec_srl (vector unsigned short,
vector unsigned char);
vector bool short vec_srl (vector bool short, vector unsigned int);
vector bool short vec_srl (vector bool short, vector unsigned short);
vector bool short vec_srl (vector bool short, vector unsigned char);
vector pixel vec_srl (vector pixel, vector unsigned int);
vector pixel vec_srl (vector pixel, vector unsigned short);
vector pixel vec_srl (vector pixel, vector unsigned char);
vector signed char vec_srl (vector signed char, vector unsigned int);
vector signed char vec_srl (vector signed char, vector unsigned short);
vector signed char vec_srl (vector signed char, vector unsigned char);
vector unsigned char vec_srl (vector unsigned char,
vector unsigned int);
vector unsigned char vec_srl (vector unsigned char,
vector unsigned short);
vector unsigned char vec_srl (vector unsigned char,
vector unsigned char);
vector bool char vec_srl (vector bool char, vector unsigned int);
vector bool char vec_srl (vector bool char, vector unsigned short);
vector bool char vec_srl (vector bool char, vector unsigned char);
vector float vec_sro (vector float, vector signed char);
vector float vec_sro (vector float, vector unsigned char);
vector signed int vec_sro (vector signed int, vector signed char);
vector signed int vec_sro (vector signed int, vector unsigned char);
vector unsigned int vec_sro (vector unsigned int, vector signed char);
vector unsigned int vec_sro (vector unsigned int, vector unsigned char);
vector signed short vec_sro (vector signed short, vector signed char);
vector signed short vec_sro (vector signed short, vector unsigned char);
vector unsigned short vec_sro (vector unsigned short,
vector signed char);
vector unsigned short vec_sro (vector unsigned short,
vector unsigned char);
vector pixel vec_sro (vector pixel, vector signed char);
vector pixel vec_sro (vector pixel, vector unsigned char);
vector signed char vec_sro (vector signed char, vector signed char);
vector signed char vec_sro (vector signed char, vector unsigned char);
vector unsigned char vec_sro (vector unsigned char, vector signed char);
vector unsigned char vec_sro (vector unsigned char,
vector unsigned char);
void vec_st (vector float, int, vector float *);
void vec_st (vector float, int, float *);
void vec_st (vector signed int, int, vector signed int *);
void vec_st (vector signed int, int, int *);
void vec_st (vector unsigned int, int, vector unsigned int *);
void vec_st (vector unsigned int, int, unsigned int *);
void vec_st (vector bool int, int, vector bool int *);
void vec_st (vector bool int, int, unsigned int *);
void vec_st (vector bool int, int, int *);
void vec_st (vector signed short, int, vector signed short *);
void vec_st (vector signed short, int, short *);
void vec_st (vector unsigned short, int, vector unsigned short *);
void vec_st (vector unsigned short, int, unsigned short *);
void vec_st (vector bool short, int, vector bool short *);
void vec_st (vector bool short, int, unsigned short *);
void vec_st (vector pixel, int, vector pixel *);
void vec_st (vector pixel, int, unsigned short *);
void vec_st (vector pixel, int, short *);
void vec_st (vector bool short, int, short *);
void vec_st (vector signed char, int, vector signed char *);
void vec_st (vector signed char, int, signed char *);
void vec_st (vector unsigned char, int, vector unsigned char *);
void vec_st (vector unsigned char, int, unsigned char *);
void vec_st (vector bool char, int, vector bool char *);
void vec_st (vector bool char, int, unsigned char *);
void vec_st (vector bool char, int, signed char *);
void vec_ste (vector signed char, int, signed char *);
void vec_ste (vector unsigned char, int, unsigned char *);
void vec_ste (vector bool char, int, signed char *);
void vec_ste (vector bool char, int, unsigned char *);
void vec_ste (vector signed short, int, short *);
void vec_ste (vector unsigned short, int, unsigned short *);
void vec_ste (vector bool short, int, short *);
void vec_ste (vector bool short, int, unsigned short *);
void vec_ste (vector pixel, int, short *);
void vec_ste (vector pixel, int, unsigned short *);
void vec_ste (vector float, int, float *);
void vec_ste (vector signed int, int, int *);
void vec_ste (vector unsigned int, int, unsigned int *);
void vec_ste (vector bool int, int, int *);
void vec_ste (vector bool int, int, unsigned int *);
void vec_stvewx (vector float, int, float *);
void vec_stvewx (vector signed int, int, int *);
void vec_stvewx (vector unsigned int, int, unsigned int *);
void vec_stvewx (vector bool int, int, int *);
void vec_stvewx (vector bool int, int, unsigned int *);
void vec_stvehx (vector signed short, int, short *);
void vec_stvehx (vector unsigned short, int, unsigned short *);
void vec_stvehx (vector bool short, int, short *);
void vec_stvehx (vector bool short, int, unsigned short *);
void vec_stvehx (vector pixel, int, short *);
void vec_stvehx (vector pixel, int, unsigned short *);
void vec_stvebx (vector signed char, int, signed char *);
void vec_stvebx (vector unsigned char, int, unsigned char *);
void vec_stvebx (vector bool char, int, signed char *);
void vec_stvebx (vector bool char, int, unsigned char *);
void vec_stl (vector float, int, vector float *);
void vec_stl (vector float, int, float *);
void vec_stl (vector signed int, int, vector signed int *);
void vec_stl (vector signed int, int, int *);
void vec_stl (vector unsigned int, int, vector unsigned int *);
void vec_stl (vector unsigned int, int, unsigned int *);
void vec_stl (vector bool int, int, vector bool int *);
void vec_stl (vector bool int, int, unsigned int *);
void vec_stl (vector bool int, int, int *);
void vec_stl (vector signed short, int, vector signed short *);
void vec_stl (vector signed short, int, short *);
void vec_stl (vector unsigned short, int, vector unsigned short *);
void vec_stl (vector unsigned short, int, unsigned short *);
void vec_stl (vector bool short, int, vector bool short *);
void vec_stl (vector bool short, int, unsigned short *);
void vec_stl (vector bool short, int, short *);
void vec_stl (vector pixel, int, vector pixel *);
void vec_stl (vector pixel, int, unsigned short *);
void vec_stl (vector pixel, int, short *);
void vec_stl (vector signed char, int, vector signed char *);
void vec_stl (vector signed char, int, signed char *);
void vec_stl (vector unsigned char, int, vector unsigned char *);
void vec_stl (vector unsigned char, int, unsigned char *);
void vec_stl (vector bool char, int, vector bool char *);
void vec_stl (vector bool char, int, unsigned char *);
void vec_stl (vector bool char, int, signed char *);
vector signed char vec_sub (vector bool char, vector signed char);
vector signed char vec_sub (vector signed char, vector bool char);
vector signed char vec_sub (vector signed char, vector signed char);
vector unsigned char vec_sub (vector bool char, vector unsigned char);
vector unsigned char vec_sub (vector unsigned char, vector bool char);
vector unsigned char vec_sub (vector unsigned char,
vector unsigned char);
vector signed short vec_sub (vector bool short, vector signed short);
vector signed short vec_sub (vector signed short, vector bool short);
vector signed short vec_sub (vector signed short, vector signed short);
vector unsigned short vec_sub (vector bool short,
vector unsigned short);
vector unsigned short vec_sub (vector unsigned short,
vector bool short);
vector unsigned short vec_sub (vector unsigned short,
vector unsigned short);
vector signed int vec_sub (vector bool int, vector signed int);
vector signed int vec_sub (vector signed int, vector bool int);
vector signed int vec_sub (vector signed int, vector signed int);
vector unsigned int vec_sub (vector bool int, vector unsigned int);
vector unsigned int vec_sub (vector unsigned int, vector bool int);
vector unsigned int vec_sub (vector unsigned int, vector unsigned int);
vector float vec_sub (vector float, vector float);
vector float vec_vsubfp (vector float, vector float);
vector signed int vec_vsubuwm (vector bool int, vector signed int);
vector signed int vec_vsubuwm (vector signed int, vector bool int);
vector signed int vec_vsubuwm (vector signed int, vector signed int);
vector unsigned int vec_vsubuwm (vector bool int, vector unsigned int);
vector unsigned int vec_vsubuwm (vector unsigned int, vector bool int);
vector unsigned int vec_vsubuwm (vector unsigned int,
vector unsigned int);
vector signed short vec_vsubuhm (vector bool short,
vector signed short);
vector signed short vec_vsubuhm (vector signed short,
vector bool short);
vector signed short vec_vsubuhm (vector signed short,
vector signed short);
vector unsigned short vec_vsubuhm (vector bool short,
vector unsigned short);
vector unsigned short vec_vsubuhm (vector unsigned short,
vector bool short);
vector unsigned short vec_vsubuhm (vector unsigned short,
vector unsigned short);
vector signed char vec_vsububm (vector bool char, vector signed char);
vector signed char vec_vsububm (vector signed char, vector bool char);
vector signed char vec_vsububm (vector signed char, vector signed char);
vector unsigned char vec_vsububm (vector bool char,
vector unsigned char);
vector unsigned char vec_vsububm (vector unsigned char,
vector bool char);
vector unsigned char vec_vsububm (vector unsigned char,
vector unsigned char);
vector unsigned int vec_subc (vector unsigned int, vector unsigned int);
vector unsigned char vec_subs (vector bool char, vector unsigned char);
vector unsigned char vec_subs (vector unsigned char, vector bool char);
vector unsigned char vec_subs (vector unsigned char,
vector unsigned char);
vector signed char vec_subs (vector bool char, vector signed char);
vector signed char vec_subs (vector signed char, vector bool char);
vector signed char vec_subs (vector signed char, vector signed char);
vector unsigned short vec_subs (vector bool short,
vector unsigned short);
vector unsigned short vec_subs (vector unsigned short,
vector bool short);
vector unsigned short vec_subs (vector unsigned short,
vector unsigned short);
vector signed short vec_subs (vector bool short, vector signed short);
vector signed short vec_subs (vector signed short, vector bool short);
vector signed short vec_subs (vector signed short, vector signed short);
vector unsigned int vec_subs (vector bool int, vector unsigned int);
vector unsigned int vec_subs (vector unsigned int, vector bool int);
vector unsigned int vec_subs (vector unsigned int, vector unsigned int);
vector signed int vec_subs (vector bool int, vector signed int);
vector signed int vec_subs (vector signed int, vector bool int);
vector signed int vec_subs (vector signed int, vector signed int);
vector signed int vec_vsubsws (vector bool int, vector signed int);
vector signed int vec_vsubsws (vector signed int, vector bool int);
vector signed int vec_vsubsws (vector signed int, vector signed int);
vector unsigned int vec_vsubuws (vector bool int, vector unsigned int);
vector unsigned int vec_vsubuws (vector unsigned int, vector bool int);
vector unsigned int vec_vsubuws (vector unsigned int,
vector unsigned int);
vector signed short vec_vsubshs (vector bool short,
vector signed short);
vector signed short vec_vsubshs (vector signed short,
vector bool short);
vector signed short vec_vsubshs (vector signed short,
vector signed short);
vector unsigned short vec_vsubuhs (vector bool short,
vector unsigned short);
vector unsigned short vec_vsubuhs (vector unsigned short,
vector bool short);
vector unsigned short vec_vsubuhs (vector unsigned short,
vector unsigned short);
vector signed char vec_vsubsbs (vector bool char, vector signed char);
vector signed char vec_vsubsbs (vector signed char, vector bool char);
vector signed char vec_vsubsbs (vector signed char, vector signed char);
vector unsigned char vec_vsububs (vector bool char,
vector unsigned char);
vector unsigned char vec_vsububs (vector unsigned char,
vector bool char);
vector unsigned char vec_vsububs (vector unsigned char,
vector unsigned char);
vector unsigned int vec_sum4s (vector unsigned char,
vector unsigned int);
vector signed int vec_sum4s (vector signed char, vector signed int);
vector signed int vec_sum4s (vector signed short, vector signed int);
vector signed int vec_vsum4shs (vector signed short, vector signed int);
vector signed int vec_vsum4sbs (vector signed char, vector signed int);
vector unsigned int vec_vsum4ubs (vector unsigned char,
vector unsigned int);
vector signed int vec_sum2s (vector signed int, vector signed int);
vector signed int vec_sums (vector signed int, vector signed int);
vector float vec_trunc (vector float);
vector signed short vec_unpackh (vector signed char);
vector bool short vec_unpackh (vector bool char);
vector signed int vec_unpackh (vector signed short);
vector bool int vec_unpackh (vector bool short);
vector unsigned int vec_unpackh (vector pixel);
vector bool int vec_vupkhsh (vector bool short);
vector signed int vec_vupkhsh (vector signed short);
vector unsigned int vec_vupkhpx (vector pixel);
vector bool short vec_vupkhsb (vector bool char);
vector signed short vec_vupkhsb (vector signed char);
vector signed short vec_unpackl (vector signed char);
vector bool short vec_unpackl (vector bool char);
vector unsigned int vec_unpackl (vector pixel);
vector signed int vec_unpackl (vector signed short);
vector bool int vec_unpackl (vector bool short);
vector unsigned int vec_vupklpx (vector pixel);
vector bool int vec_vupklsh (vector bool short);
vector signed int vec_vupklsh (vector signed short);
vector bool short vec_vupklsb (vector bool char);
vector signed short vec_vupklsb (vector signed char);
vector float vec_xor (vector float, vector float);
vector float vec_xor (vector float, vector bool int);
vector float vec_xor (vector bool int, vector float);
vector bool int vec_xor (vector bool int, vector bool int);
vector signed int vec_xor (vector bool int, vector signed int);
vector signed int vec_xor (vector signed int, vector bool int);
vector signed int vec_xor (vector signed int, vector signed int);
vector unsigned int vec_xor (vector bool int, vector unsigned int);
vector unsigned int vec_xor (vector unsigned int, vector bool int);
vector unsigned int vec_xor (vector unsigned int, vector unsigned int);
vector bool short vec_xor (vector bool short, vector bool short);
vector signed short vec_xor (vector bool short, vector signed short);
vector signed short vec_xor (vector signed short, vector bool short);
vector signed short vec_xor (vector signed short, vector signed short);
vector unsigned short vec_xor (vector bool short,
vector unsigned short);
vector unsigned short vec_xor (vector unsigned short,
vector bool short);
vector unsigned short vec_xor (vector unsigned short,
vector unsigned short);
vector signed char vec_xor (vector bool char, vector signed char);
vector bool char vec_xor (vector bool char, vector bool char);
vector signed char vec_xor (vector signed char, vector bool char);
vector signed char vec_xor (vector signed char, vector signed char);
vector unsigned char vec_xor (vector bool char, vector unsigned char);
vector unsigned char vec_xor (vector unsigned char, vector bool char);
vector unsigned char vec_xor (vector unsigned char,
vector unsigned char);
int vec_all_eq (vector signed char, vector bool char);
int vec_all_eq (vector signed char, vector signed char);
int vec_all_eq (vector unsigned char, vector bool char);
int vec_all_eq (vector unsigned char, vector unsigned char);
int vec_all_eq (vector bool char, vector bool char);
int vec_all_eq (vector bool char, vector unsigned char);
int vec_all_eq (vector bool char, vector signed char);
int vec_all_eq (vector signed short, vector bool short);
int vec_all_eq (vector signed short, vector signed short);
int vec_all_eq (vector unsigned short, vector bool short);
int vec_all_eq (vector unsigned short, vector unsigned short);
int vec_all_eq (vector bool short, vector bool short);
int vec_all_eq (vector bool short, vector unsigned short);
int vec_all_eq (vector bool short, vector signed short);
int vec_all_eq (vector pixel, vector pixel);
int vec_all_eq (vector signed int, vector bool int);
int vec_all_eq (vector signed int, vector signed int);
int vec_all_eq (vector unsigned int, vector bool int);
int vec_all_eq (vector unsigned int, vector unsigned int);
int vec_all_eq (vector bool int, vector bool int);
int vec_all_eq (vector bool int, vector unsigned int);
int vec_all_eq (vector bool int, vector signed int);
int vec_all_eq (vector float, vector float);
int vec_all_ge (vector bool char, vector unsigned char);
int vec_all_ge (vector unsigned char, vector bool char);
int vec_all_ge (vector unsigned char, vector unsigned char);
int vec_all_ge (vector bool char, vector signed char);
int vec_all_ge (vector signed char, vector bool char);
int vec_all_ge (vector signed char, vector signed char);
int vec_all_ge (vector bool short, vector unsigned short);
int vec_all_ge (vector unsigned short, vector bool short);
int vec_all_ge (vector unsigned short, vector unsigned short);
int vec_all_ge (vector signed short, vector signed short);
int vec_all_ge (vector bool short, vector signed short);
int vec_all_ge (vector signed short, vector bool short);
int vec_all_ge (vector bool int, vector unsigned int);
int vec_all_ge (vector unsigned int, vector bool int);
int vec_all_ge (vector unsigned int, vector unsigned int);
int vec_all_ge (vector bool int, vector signed int);
int vec_all_ge (vector signed int, vector bool int);
int vec_all_ge (vector signed int, vector signed int);
int vec_all_ge (vector float, vector float);
int vec_all_gt (vector bool char, vector unsigned char);
int vec_all_gt (vector unsigned char, vector bool char);
int vec_all_gt (vector unsigned char, vector unsigned char);
int vec_all_gt (vector bool char, vector signed char);
int vec_all_gt (vector signed char, vector bool char);
int vec_all_gt (vector signed char, vector signed char);
int vec_all_gt (vector bool short, vector unsigned short);
int vec_all_gt (vector unsigned short, vector bool short);
int vec_all_gt (vector unsigned short, vector unsigned short);
int vec_all_gt (vector bool short, vector signed short);
int vec_all_gt (vector signed short, vector bool short);
int vec_all_gt (vector signed short, vector signed short);
int vec_all_gt (vector bool int, vector unsigned int);
int vec_all_gt (vector unsigned int, vector bool int);
int vec_all_gt (vector unsigned int, vector unsigned int);
int vec_all_gt (vector bool int, vector signed int);
int vec_all_gt (vector signed int, vector bool int);
int vec_all_gt (vector signed int, vector signed int);
int vec_all_gt (vector float, vector float);
int vec_all_in (vector float, vector float);
int vec_all_le (vector bool char, vector unsigned char);
int vec_all_le (vector unsigned char, vector bool char);
int vec_all_le (vector unsigned char, vector unsigned char);
int vec_all_le (vector bool char, vector signed char);
int vec_all_le (vector signed char, vector bool char);
int vec_all_le (vector signed char, vector signed char);
int vec_all_le (vector bool short, vector unsigned short);
int vec_all_le (vector unsigned short, vector bool short);
int vec_all_le (vector unsigned short, vector unsigned short);
int vec_all_le (vector bool short, vector signed short);
int vec_all_le (vector signed short, vector bool short);
int vec_all_le (vector signed short, vector signed short);
int vec_all_le (vector bool int, vector unsigned int);
int vec_all_le (vector unsigned int, vector bool int);
int vec_all_le (vector unsigned int, vector unsigned int);
int vec_all_le (vector bool int, vector signed int);
int vec_all_le (vector signed int, vector bool int);
int vec_all_le (vector signed int, vector signed int);
int vec_all_le (vector float, vector float);
int vec_all_lt (vector bool char, vector unsigned char);
int vec_all_lt (vector unsigned char, vector bool char);
int vec_all_lt (vector unsigned char, vector unsigned char);
int vec_all_lt (vector bool char, vector signed char);
int vec_all_lt (vector signed char, vector bool char);
int vec_all_lt (vector signed char, vector signed char);
int vec_all_lt (vector bool short, vector unsigned short);
int vec_all_lt (vector unsigned short, vector bool short);
int vec_all_lt (vector unsigned short, vector unsigned short);
int vec_all_lt (vector bool short, vector signed short);
int vec_all_lt (vector signed short, vector bool short);
int vec_all_lt (vector signed short, vector signed short);
int vec_all_lt (vector bool int, vector unsigned int);
int vec_all_lt (vector unsigned int, vector bool int);
int vec_all_lt (vector unsigned int, vector unsigned int);
int vec_all_lt (vector bool int, vector signed int);
int vec_all_lt (vector signed int, vector bool int);
int vec_all_lt (vector signed int, vector signed int);
int vec_all_lt (vector float, vector float);
int vec_all_nan (vector float);
int vec_all_ne (vector signed char, vector bool char);
int vec_all_ne (vector signed char, vector signed char);
int vec_all_ne (vector unsigned char, vector bool char);
int vec_all_ne (vector unsigned char, vector unsigned char);
int vec_all_ne (vector bool char, vector bool char);
int vec_all_ne (vector bool char, vector unsigned char);
int vec_all_ne (vector bool char, vector signed char);
int vec_all_ne (vector signed short, vector bool short);
int vec_all_ne (vector signed short, vector signed short);
int vec_all_ne (vector unsigned short, vector bool short);
int vec_all_ne (vector unsigned short, vector unsigned short);
int vec_all_ne (vector bool short, vector bool short);
int vec_all_ne (vector bool short, vector unsigned short);
int vec_all_ne (vector bool short, vector signed short);
int vec_all_ne (vector pixel, vector pixel);
int vec_all_ne (vector signed int, vector bool int);
int vec_all_ne (vector signed int, vector signed int);
int vec_all_ne (vector unsigned int, vector bool int);
int vec_all_ne (vector unsigned int, vector unsigned int);
int vec_all_ne (vector bool int, vector bool int);
int vec_all_ne (vector bool int, vector unsigned int);
int vec_all_ne (vector bool int, vector signed int);
int vec_all_ne (vector float, vector float);
int vec_all_nge (vector float, vector float);
int vec_all_ngt (vector float, vector float);
int vec_all_nle (vector float, vector float);
int vec_all_nlt (vector float, vector float);
int vec_all_numeric (vector float);
int vec_any_eq (vector signed char, vector bool char);
int vec_any_eq (vector signed char, vector signed char);
int vec_any_eq (vector unsigned char, vector bool char);
int vec_any_eq (vector unsigned char, vector unsigned char);
int vec_any_eq (vector bool char, vector bool char);
int vec_any_eq (vector bool char, vector unsigned char);
int vec_any_eq (vector bool char, vector signed char);
int vec_any_eq (vector signed short, vector bool short);
int vec_any_eq (vector signed short, vector signed short);
int vec_any_eq (vector unsigned short, vector bool short);
int vec_any_eq (vector unsigned short, vector unsigned short);
int vec_any_eq (vector bool short, vector bool short);
int vec_any_eq (vector bool short, vector unsigned short);
int vec_any_eq (vector bool short, vector signed short);
int vec_any_eq (vector pixel, vector pixel);
int vec_any_eq (vector signed int, vector bool int);
int vec_any_eq (vector signed int, vector signed int);
int vec_any_eq (vector unsigned int, vector bool int);
int vec_any_eq (vector unsigned int, vector unsigned int);
int vec_any_eq (vector bool int, vector bool int);
int vec_any_eq (vector bool int, vector unsigned int);
int vec_any_eq (vector bool int, vector signed int);
int vec_any_eq (vector float, vector float);
int vec_any_ge (vector signed char, vector bool char);
int vec_any_ge (vector unsigned char, vector bool char);
int vec_any_ge (vector unsigned char, vector unsigned char);
int vec_any_ge (vector signed char, vector signed char);
int vec_any_ge (vector bool char, vector unsigned char);
int vec_any_ge (vector bool char, vector signed char);
int vec_any_ge (vector unsigned short, vector bool short);
int vec_any_ge (vector unsigned short, vector unsigned short);
int vec_any_ge (vector signed short, vector signed short);
int vec_any_ge (vector signed short, vector bool short);
int vec_any_ge (vector bool short, vector unsigned short);
int vec_any_ge (vector bool short, vector signed short);
int vec_any_ge (vector signed int, vector bool int);
int vec_any_ge (vector unsigned int, vector bool int);
int vec_any_ge (vector unsigned int, vector unsigned int);
int vec_any_ge (vector signed int, vector signed int);
int vec_any_ge (vector bool int, vector unsigned int);
int vec_any_ge (vector bool int, vector signed int);
int vec_any_ge (vector float, vector float);
int vec_any_gt (vector bool char, vector unsigned char);
int vec_any_gt (vector unsigned char, vector bool char);
int vec_any_gt (vector unsigned char, vector unsigned char);
int vec_any_gt (vector bool char, vector signed char);
int vec_any_gt (vector signed char, vector bool char);
int vec_any_gt (vector signed char, vector signed char);
int vec_any_gt (vector bool short, vector unsigned short);
int vec_any_gt (vector unsigned short, vector bool short);
int vec_any_gt (vector unsigned short, vector unsigned short);
int vec_any_gt (vector bool short, vector signed short);
int vec_any_gt (vector signed short, vector bool short);
int vec_any_gt (vector signed short, vector signed short);
int vec_any_gt (vector bool int, vector unsigned int);
int vec_any_gt (vector unsigned int, vector bool int);
int vec_any_gt (vector unsigned int, vector unsigned int);
int vec_any_gt (vector bool int, vector signed int);
int vec_any_gt (vector signed int, vector bool int);
int vec_any_gt (vector signed int, vector signed int);
int vec_any_gt (vector float, vector float);
int vec_any_le (vector bool char, vector unsigned char);
int vec_any_le (vector unsigned char, vector bool char);
int vec_any_le (vector unsigned char, vector unsigned char);
int vec_any_le (vector bool char, vector signed char);
int vec_any_le (vector signed char, vector bool char);
int vec_any_le (vector signed char, vector signed char);
int vec_any_le (vector bool short, vector unsigned short);
int vec_any_le (vector unsigned short, vector bool short);
int vec_any_le (vector unsigned short, vector unsigned short);
int vec_any_le (vector bool short, vector signed short);
int vec_any_le (vector signed short, vector bool short);
int vec_any_le (vector signed short, vector signed short);
int vec_any_le (vector bool int, vector unsigned int);
int vec_any_le (vector unsigned int, vector bool int);
int vec_any_le (vector unsigned int, vector unsigned int);
int vec_any_le (vector bool int, vector signed int);
int vec_any_le (vector signed int, vector bool int);
int vec_any_le (vector signed int, vector signed int);
int vec_any_le (vector float, vector float);
int vec_any_lt (vector bool char, vector unsigned char);
int vec_any_lt (vector unsigned char, vector bool char);
int vec_any_lt (vector unsigned char, vector unsigned char);
int vec_any_lt (vector bool char, vector signed char);
int vec_any_lt (vector signed char, vector bool char);
int vec_any_lt (vector signed char, vector signed char);
int vec_any_lt (vector bool short, vector unsigned short);
int vec_any_lt (vector unsigned short, vector bool short);
int vec_any_lt (vector unsigned short, vector unsigned short);
int vec_any_lt (vector bool short, vector signed short);
int vec_any_lt (vector signed short, vector bool short);
int vec_any_lt (vector signed short, vector signed short);
int vec_any_lt (vector bool int, vector unsigned int);
int vec_any_lt (vector unsigned int, vector bool int);
int vec_any_lt (vector unsigned int, vector unsigned int);
int vec_any_lt (vector bool int, vector signed int);
int vec_any_lt (vector signed int, vector bool int);
int vec_any_lt (vector signed int, vector signed int);
int vec_any_lt (vector float, vector float);
int vec_any_nan (vector float);
int vec_any_ne (vector signed char, vector bool char);
int vec_any_ne (vector signed char, vector signed char);
int vec_any_ne (vector unsigned char, vector bool char);
int vec_any_ne (vector unsigned char, vector unsigned char);
int vec_any_ne (vector bool char, vector bool char);
int vec_any_ne (vector bool char, vector unsigned char);
int vec_any_ne (vector bool char, vector signed char);
int vec_any_ne (vector signed short, vector bool short);
int vec_any_ne (vector signed short, vector signed short);
int vec_any_ne (vector unsigned short, vector bool short);
int vec_any_ne (vector unsigned short, vector unsigned short);
int vec_any_ne (vector bool short, vector bool short);
int vec_any_ne (vector bool short, vector unsigned short);
int vec_any_ne (vector bool short, vector signed short);
int vec_any_ne (vector pixel, vector pixel);
int vec_any_ne (vector signed int, vector bool int);
int vec_any_ne (vector signed int, vector signed int);
int vec_any_ne (vector unsigned int, vector bool int);
int vec_any_ne (vector unsigned int, vector unsigned int);
int vec_any_ne (vector bool int, vector bool int);
int vec_any_ne (vector bool int, vector unsigned int);
int vec_any_ne (vector bool int, vector signed int);
int vec_any_ne (vector float, vector float);
int vec_any_nge (vector float, vector float);
int vec_any_ngt (vector float, vector float);
int vec_any_nle (vector float, vector float);
int vec_any_nlt (vector float, vector float);
int vec_any_numeric (vector float);
int vec_any_out (vector float, vector float);

File: gcc.info, Node: SPARC VIS Built-in Functions, Next: SPU Built-in Functions, Prev: PowerPC AltiVec Built-in Functions, Up: Target Builtins
5.50.10 SPARC VIS Built-in Functions
------------------------------------
GCC supports SIMD operations on the SPARC using both the generic vector
extensions (*note Vector Extensions::) as well as built-in functions for
the SPARC Visual Instruction Set (VIS). When you use the '-mvis' switch,
the VIS extension is exposed as the following built-in functions:
typedef int v2si __attribute__ ((vector_size (8)));
typedef short v4hi __attribute__ ((vector_size (8)));
typedef short v2hi __attribute__ ((vector_size (4)));
typedef char v8qi __attribute__ ((vector_size (8)));
typedef char v4qi __attribute__ ((vector_size (4)));
void * __builtin_vis_alignaddr (void *, long);
int64_t __builtin_vis_faligndatadi (int64_t, int64_t);
v2si __builtin_vis_faligndatav2si (v2si, v2si);
v4hi __builtin_vis_faligndatav4hi (v4si, v4si);
v8qi __builtin_vis_faligndatav8qi (v8qi, v8qi);
v4hi __builtin_vis_fexpand (v4qi);
v4hi __builtin_vis_fmul8x16 (v4qi, v4hi);
v4hi __builtin_vis_fmul8x16au (v4qi, v4hi);
v4hi __builtin_vis_fmul8x16al (v4qi, v4hi);
v4hi __builtin_vis_fmul8sux16 (v8qi, v4hi);
v4hi __builtin_vis_fmul8ulx16 (v8qi, v4hi);
v2si __builtin_vis_fmuld8sux16 (v4qi, v2hi);
v2si __builtin_vis_fmuld8ulx16 (v4qi, v2hi);
v4qi __builtin_vis_fpack16 (v4hi);
v8qi __builtin_vis_fpack32 (v2si, v2si);
v2hi __builtin_vis_fpackfix (v2si);
v8qi __builtin_vis_fpmerge (v4qi, v4qi);
int64_t __builtin_vis_pdist (v8qi, v8qi, int64_t);

File: gcc.info, Node: SPU Built-in Functions, Prev: SPARC VIS Built-in Functions, Up: Target Builtins
5.50.11 SPU Built-in Functions
------------------------------
GCC provides extensions for the SPU processor as described in the
Sony/Toshiba/IBM SPU Language Extensions Specification, which can be
found at <http://cell.scei.co.jp/> or
<http://www.ibm.com/developerworks/power/cell/>. GCC's implementation
differs in several ways.
* The optional extension of specifying vector constants in
parentheses is not supported.
* A vector initializer requires no cast if the vector constant is of
the same type as the variable it is initializing.
* If 'signed' or 'unsigned' is omitted, the signedness of the vector
type is the default signedness of the base type. The default
varies depending on the operating system, so a portable program
should always specify the signedness.
* By default, the keyword '__vector' is added. The macro 'vector' is
defined in '<spu_intrinsics.h>' and can be undefined.
* GCC allows using a 'typedef' name as the type specifier for a
vector type.
* For C, overloaded functions are implemented with macros so the
following does not work:
spu_add ((vector signed int){1, 2, 3, 4}, foo);
Since 'spu_add' is a macro, the vector constant in the example is
treated as four separate arguments. Wrap the entire argument in
parentheses for this to work.
* The extended version of '__builtin_expect' is not supported.
_Note:_ Only the interface described in the aforementioned
specification is supported. Internally, GCC uses built-in functions to
implement the required functionality, but these are not supported and
are subject to change without notice.

File: gcc.info, Node: Target Format Checks, Next: Pragmas, Prev: Target Builtins, Up: C Extensions
5.51 Format Checks Specific to Particular Target Machines
=========================================================
For some target machines, GCC supports additional options to the format
attribute (*note Declaring Attributes of Functions: Function
Attributes.).
* Menu:
* Solaris Format Checks::

File: gcc.info, Node: Solaris Format Checks, Up: Target Format Checks
5.51.1 Solaris Format Checks
----------------------------
Solaris targets support the 'cmn_err' (or '__cmn_err__') format check.
'cmn_err' accepts a subset of the standard 'printf' conversions, and the
two-argument '%b' conversion for displaying bit-fields. See the Solaris
man page for 'cmn_err' for more information.

File: gcc.info, Node: Pragmas, Next: Unnamed Fields, Prev: Target Format Checks, Up: C Extensions
5.52 Pragmas Accepted by GCC
============================
GCC supports several types of pragmas, primarily in order to compile
code originally written for other compilers. Note that in general we do
not recommend the use of pragmas; *Note Function Attributes::, for
further explanation.
* Menu:
* ARM Pragmas::
* M32C Pragmas::
* RS/6000 and PowerPC Pragmas::
* Darwin Pragmas::
* Solaris Pragmas::
* Symbol-Renaming Pragmas::
* Structure-Packing Pragmas::
* Weak Pragmas::
* Diagnostic Pragmas::
* Visibility Pragmas::

File: gcc.info, Node: ARM Pragmas, Next: M32C Pragmas, Up: Pragmas
5.52.1 ARM Pragmas
------------------
The ARM target defines pragmas for controlling the default addition of
'long_call' and 'short_call' attributes to functions. *Note Function
Attributes::, for information about the effects of these attributes.
'long_calls'
Set all subsequent functions to have the 'long_call' attribute.
'no_long_calls'
Set all subsequent functions to have the 'short_call' attribute.
'long_calls_off'
Do not affect the 'long_call' or 'short_call' attributes of
subsequent functions.

File: gcc.info, Node: M32C Pragmas, Next: RS/6000 and PowerPC Pragmas, Prev: ARM Pragmas, Up: Pragmas
5.52.2 M32C Pragmas
-------------------
'memregs NUMBER'
Overrides the command line option '-memregs=' for the current file.
Use with care! This pragma must be before any function in the
file, and mixing different memregs values in different objects may
make them incompatible. This pragma is useful when a
performance-critical function uses a memreg for temporary values,
as it may allow you to reduce the number of memregs used.

File: gcc.info, Node: RS/6000 and PowerPC Pragmas, Next: Darwin Pragmas, Prev: M32C Pragmas, Up: Pragmas
5.52.3 RS/6000 and PowerPC Pragmas
----------------------------------
The RS/6000 and PowerPC targets define one pragma for controlling
whether or not the 'longcall' attribute is added to function
declarations by default. This pragma overrides the '-mlongcall' option,
but not the 'longcall' and 'shortcall' attributes. *Note RS/6000 and
PowerPC Options::, for more information about when long calls are and
are not necessary.
'longcall (1)'
Apply the 'longcall' attribute to all subsequent function
declarations.
'longcall (0)'
Do not apply the 'longcall' attribute to subsequent function
declarations.

File: gcc.info, Node: Darwin Pragmas, Next: Solaris Pragmas, Prev: RS/6000 and PowerPC Pragmas, Up: Pragmas
5.52.4 Darwin Pragmas
---------------------
The following pragmas are available for all architectures running the
Darwin operating system. These are useful for compatibility with other
Mac OS compilers.
'mark TOKENS...'
This pragma is accepted, but has no effect.
'options align=ALIGNMENT'
This pragma sets the alignment of fields in structures. The values
of ALIGNMENT may be 'mac68k', to emulate m68k alignment, or
'power', to emulate PowerPC alignment. Uses of this pragma nest
properly; to restore the previous setting, use 'reset' for the
ALIGNMENT.
'segment TOKENS...'
This pragma is accepted, but has no effect.
'unused (VAR [, VAR]...)'
This pragma declares variables to be possibly unused. GCC will not
produce warnings for the listed variables. The effect is similar
to that of the 'unused' attribute, except that this pragma may
appear anywhere within the variables' scopes.

File: gcc.info, Node: Solaris Pragmas, Next: Symbol-Renaming Pragmas, Prev: Darwin Pragmas, Up: Pragmas
5.52.5 Solaris Pragmas
----------------------
The Solaris target supports '#pragma redefine_extname' (*note
Symbol-Renaming Pragmas::). It also supports additional '#pragma'
directives for compatibility with the system compiler.
'align ALIGNMENT (VARIABLE [, VARIABLE]...)'
Increase the minimum alignment of each VARIABLE to ALIGNMENT. This
is the same as GCC's 'aligned' attribute *note Variable
Attributes::). Macro expansion occurs on the arguments to this
pragma when compiling C and Objective-C. It does not currently
occur when compiling C++, but this is a bug which may be fixed in a
future release.
'fini (FUNCTION [, FUNCTION]...)'
This pragma causes each listed FUNCTION to be called after main, or
during shared module unloading, by adding a call to the '.fini'
section.
'init (FUNCTION [, FUNCTION]...)'
This pragma causes each listed FUNCTION to be called during
initialization (before 'main') or during shared module loading, by
adding a call to the '.init' section.

File: gcc.info, Node: Symbol-Renaming Pragmas, Next: Structure-Packing Pragmas, Prev: Solaris Pragmas, Up: Pragmas
5.52.6 Symbol-Renaming Pragmas
------------------------------
For compatibility with the Solaris and Tru64 UNIX system headers, GCC
supports two '#pragma' directives which change the name used in assembly
for a given declaration. These pragmas are only available on platforms
whose system headers need them. To get this effect on all platforms
supported by GCC, use the asm labels extension (*note Asm Labels::).
'redefine_extname OLDNAME NEWNAME'
This pragma gives the C function OLDNAME the assembly symbol
NEWNAME. The preprocessor macro '__PRAGMA_REDEFINE_EXTNAME' will
be defined if this pragma is available (currently only on Solaris).
'extern_prefix STRING'
This pragma causes all subsequent external function and variable
declarations to have STRING prepended to their assembly symbols.
This effect may be terminated with another 'extern_prefix' pragma
whose argument is an empty string. The preprocessor macro
'__PRAGMA_EXTERN_PREFIX' will be defined if this pragma is
available (currently only on Tru64 UNIX).
These pragmas and the asm labels extension interact in a complicated
manner. Here are some corner cases you may want to be aware of.
1. Both pragmas silently apply only to declarations with external
linkage. Asm labels do not have this restriction.
2. In C++, both pragmas silently apply only to declarations with "C"
linkage. Again, asm labels do not have this restriction.
3. If any of the three ways of changing the assembly name of a
declaration is applied to a declaration whose assembly name has
already been determined (either by a previous use of one of these
features, or because the compiler needed the assembly name in order
to generate code), and the new name is different, a warning issues
and the name does not change.
4. The OLDNAME used by '#pragma redefine_extname' is always the
C-language name.
5. If '#pragma extern_prefix' is in effect, and a declaration occurs
with an asm label attached, the prefix is silently ignored for that
declaration.
6. If '#pragma extern_prefix' and '#pragma redefine_extname' apply to
the same declaration, whichever triggered first wins, and a warning
issues if they contradict each other. (We would like to have
'#pragma redefine_extname' always win, for consistency with asm
labels, but if '#pragma extern_prefix' triggers first we have no
way of knowing that that happened.)

File: gcc.info, Node: Structure-Packing Pragmas, Next: Weak Pragmas, Prev: Symbol-Renaming Pragmas, Up: Pragmas
5.52.7 Structure-Packing Pragmas
--------------------------------
For compatibility with Win32, GCC supports a set of '#pragma' directives
which change the maximum alignment of members of structures (other than
zero-width bitfields), unions, and classes subsequently defined. The N
value below always is required to be a small power of two and specifies
the new alignment in bytes.
1. '#pragma pack(N)' simply sets the new alignment.
2. '#pragma pack()' sets the alignment to the one that was in effect
when compilation started (see also command line option
'-fpack-struct[=<n>]' *note Code Gen Options::).
3. '#pragma pack(push[,N])' pushes the current alignment setting on an
internal stack and then optionally sets the new alignment.
4. '#pragma pack(pop)' restores the alignment setting to the one saved
at the top of the internal stack (and removes that stack entry).
Note that '#pragma pack([N])' does not influence this internal
stack; thus it is possible to have '#pragma pack(push)' followed by
multiple '#pragma pack(N)' instances and finalized by a single
'#pragma pack(pop)'.
Some targets, e.g. i386 and powerpc, support the 'ms_struct' '#pragma'
which lays out a structure as the documented '__attribute__
((ms_struct))'.
1. '#pragma ms_struct on' turns on the layout for structures declared.
2. '#pragma ms_struct off' turns off the layout for structures
declared.
3. '#pragma ms_struct reset' goes back to the default layout.

File: gcc.info, Node: Weak Pragmas, Next: Diagnostic Pragmas, Prev: Structure-Packing Pragmas, Up: Pragmas
5.52.8 Weak Pragmas
-------------------
For compatibility with SVR4, GCC supports a set of '#pragma' directives
for declaring symbols to be weak, and defining weak aliases.
'#pragma weak SYMBOL'
This pragma declares SYMBOL to be weak, as if the declaration had
the attribute of the same name. The pragma may appear before or
after the declaration of SYMBOL, but must appear before either its
first use or its definition. It is not an error for SYMBOL to
never be defined at all.
'#pragma weak SYMBOL1 = SYMBOL2'
This pragma declares SYMBOL1 to be a weak alias of SYMBOL2. It is
an error if SYMBOL2 is not defined in the current translation unit.

File: gcc.info, Node: Diagnostic Pragmas, Next: Visibility Pragmas, Prev: Weak Pragmas, Up: Pragmas
5.52.9 Diagnostic Pragmas
-------------------------
GCC allows the user to selectively enable or disable certain types of
diagnostics, and change the kind of the diagnostic. For example, a
project's policy might require that all sources compile with '-Werror'
but certain files might have exceptions allowing specific types of
warnings. Or, a project might selectively enable diagnostics and treat
them as errors depending on which preprocessor macros are defined.
'#pragma GCC diagnostic KIND OPTION'
Modifies the disposition of a diagnostic. Note that not all
diagnostics are modifiable; at the moment only warnings (normally
controlled by '-W...') can be controlled, and not all of them. Use
'-fdiagnostics-show-option' to determine which diagnostics are
controllable and which option controls them.
KIND is 'error' to treat this diagnostic as an error, 'warning' to
treat it like a warning (even if '-Werror' is in effect), or
'ignored' if the diagnostic is to be ignored. OPTION is a double
quoted string which matches the command line option.
#pragma GCC diagnostic warning "-Wformat"
#pragma GCC diagnostic error "-Wformat"
#pragma GCC diagnostic ignored "-Wformat"
Note that these pragmas override any command line options. Also,
while it is syntactically valid to put these pragmas anywhere in
your sources, the only supported location for them is before any
data or functions are defined. Doing otherwise may result in
unpredictable results depending on how the optimizer manages your
sources. If the same option is listed multiple times, the last one
specified is the one that is in effect. This pragma is not
intended to be a general purpose replacement for command line
options, but for implementing strict control over project policies.

File: gcc.info, Node: Visibility Pragmas, Prev: Diagnostic Pragmas, Up: Pragmas
5.52.10 Visibility Pragmas
--------------------------
'#pragma GCC visibility push(VISIBILITY)'
'#pragma GCC visibility pop'
This pragma allows the user to set the visibility for multiple
declarations without having to give each a visibility attribute
*Note Function Attributes::, for more information about visibility
and the attribute syntax.
In C++, '#pragma GCC visibility' affects only namespace-scope
declarations. Class members and template specializations are not
affected; if you want to override the visibility for a particular
member or instantiation, you must use an attribute.

File: gcc.info, Node: Unnamed Fields, Next: Thread-Local, Prev: Pragmas, Up: C Extensions
5.53 Unnamed struct/union fields within structs/unions
======================================================
For compatibility with other compilers, GCC allows you to define a
structure or union that contains, as fields, structures and unions
without names. For example:
struct {
int a;
union {
int b;
float c;
};
int d;
} foo;
In this example, the user would be able to access members of the
unnamed union with code like 'foo.b'. Note that only unnamed structs
and unions are allowed, you may not have, for example, an unnamed 'int'.
You must never create such structures that cause ambiguous field
definitions. For example, this structure:
struct {
int a;
struct {
int a;
};
} foo;
It is ambiguous which 'a' is being referred to with 'foo.a'. Such
constructs are not supported and must be avoided. In the future, such
constructs may be detected and treated as compilation errors.
Unless '-fms-extensions' is used, the unnamed field must be a structure
or union definition without a tag (for example, 'struct { int a; };').
If '-fms-extensions' is used, the field may also be a definition with a
tag such as 'struct foo { int a; };', a reference to a previously
defined structure or union such as 'struct foo;', or a reference to a
'typedef' name for a previously defined structure or union type.

File: gcc.info, Node: Thread-Local, Next: Binary constants, Prev: Unnamed Fields, Up: C Extensions
5.54 Thread-Local Storage
=========================
Thread-local storage (TLS) is a mechanism by which variables are
allocated such that there is one instance of the variable per extant
thread. The run-time model GCC uses to implement this originates in the
IA-64 processor-specific ABI, but has since been migrated to other
processors as well. It requires significant support from the linker
('ld'), dynamic linker ('ld.so'), and system libraries ('libc.so' and
'libpthread.so'), so it is not available everywhere.
At the user level, the extension is visible with a new storage class
keyword: '__thread'. For example:
__thread int i;
extern __thread struct state s;
static __thread char *p;
The '__thread' specifier may be used alone, with the 'extern' or
'static' specifiers, but with no other storage class specifier. When
used with 'extern' or 'static', '__thread' must appear immediately after
the other storage class specifier.
The '__thread' specifier may be applied to any global, file-scoped
static, function-scoped static, or static data member of a class. It
may not be applied to block-scoped automatic or non-static data member.
When the address-of operator is applied to a thread-local variable, it
is evaluated at run-time and returns the address of the current thread's
instance of that variable. An address so obtained may be used by any
thread. When a thread terminates, any pointers to thread-local
variables in that thread become invalid.
No static initialization may refer to the address of a thread-local
variable.
In C++, if an initializer is present for a thread-local variable, it
must be a CONSTANT-EXPRESSION, as defined in 5.19.2 of the ANSI/ISO C++
standard.
See ELF Handling For Thread-Local Storage
(http://people.redhat.com/drepper/tls.pdf) for a detailed explanation of
the four thread-local storage addressing models, and how the run-time is
expected to function.
* Menu:
* C99 Thread-Local Edits::
* C++98 Thread-Local Edits::

File: gcc.info, Node: C99 Thread-Local Edits, Next: C++98 Thread-Local Edits, Up: Thread-Local
5.54.1 ISO/IEC 9899:1999 Edits for Thread-Local Storage
-------------------------------------------------------
The following are a set of changes to ISO/IEC 9899:1999 (aka C99) that
document the exact semantics of the language extension.
* '5.1.2 Execution environments'
Add new text after paragraph 1
Within either execution environment, a "thread" is a flow of
control within a program. It is implementation defined
whether or not there may be more than one thread associated
with a program. It is implementation defined how threads
beyond the first are created, the name and type of the
function called at thread startup, and how threads may be
terminated. However, objects with thread storage duration
shall be initialized before thread startup.
* '6.2.4 Storage durations of objects'
Add new text before paragraph 3
An object whose identifier is declared with the storage-class
specifier '__thread' has "thread storage duration". Its
lifetime is the entire execution of the thread, and its stored
value is initialized only once, prior to thread startup.
* '6.4.1 Keywords'
Add '__thread'.
* '6.7.1 Storage-class specifiers'
Add '__thread' to the list of storage class specifiers in paragraph
1.
Change paragraph 2 to
With the exception of '__thread', at most one storage-class
specifier may be given [...]. The '__thread' specifier may be
used alone, or immediately following 'extern' or 'static'.
Add new text after paragraph 6
The declaration of an identifier for a variable that has block
scope that specifies '__thread' shall also specify either
'extern' or 'static'.
The '__thread' specifier shall be used only with variables.

File: gcc.info, Node: C++98 Thread-Local Edits, Prev: C99 Thread-Local Edits, Up: Thread-Local
5.54.2 ISO/IEC 14882:1998 Edits for Thread-Local Storage
--------------------------------------------------------
The following are a set of changes to ISO/IEC 14882:1998 (aka C++98)
that document the exact semantics of the language extension.
* [intro.execution]
New text after paragraph 4
A "thread" is a flow of control within the abstract machine.
It is implementation defined whether or not there may be more
than one thread.
New text after paragraph 7
It is unspecified whether additional action must be taken to
ensure when and whether side effects are visible to other
threads.
* [lex.key]
Add '__thread'.
* [basic.start.main]
Add after paragraph 5
The thread that begins execution at the 'main' function is
called the "main thread". It is implementation defined how
functions beginning threads other than the main thread are
designated or typed. A function so designated, as well as the
'main' function, is called a "thread startup function". It is
implementation defined what happens if a thread startup
function returns. It is implementation defined what happens
to other threads when any thread calls 'exit'.
* [basic.start.init]
Add after paragraph 4
The storage for an object of thread storage duration shall be
statically initialized before the first statement of the
thread startup function. An object of thread storage duration
shall not require dynamic initialization.
* [basic.start.term]
Add after paragraph 3
The type of an object with thread storage duration shall not
have a non-trivial destructor, nor shall it be an array type
whose elements (directly or indirectly) have non-trivial
destructors.
* [basic.stc]
Add "thread storage duration" to the list in paragraph 1.
Change paragraph 2
Thread, static, and automatic storage durations are associated
with objects introduced by declarations [...].
Add '__thread' to the list of specifiers in paragraph 3.
* [basic.stc.thread]
New section before [basic.stc.static]
The keyword '__thread' applied to a non-local object gives the
object thread storage duration.
A local variable or class data member declared both 'static'
and '__thread' gives the variable or member thread storage
duration.
* [basic.stc.static]
Change paragraph 1
All objects which have neither thread storage duration,
dynamic storage duration nor are local [...].
* [dcl.stc]
Add '__thread' to the list in paragraph 1.
Change paragraph 1
With the exception of '__thread', at most one
STORAGE-CLASS-SPECIFIER shall appear in a given
DECL-SPECIFIER-SEQ. The '__thread' specifier may be used
alone, or immediately following the 'extern' or 'static'
specifiers. [...]
Add after paragraph 5
The '__thread' specifier can be applied only to the names of
objects and to anonymous unions.
* [class.mem]
Add after paragraph 6
Non-'static' members shall not be '__thread'.

File: gcc.info, Node: Binary constants, Prev: Thread-Local, Up: C Extensions
5.55 Binary constants using the '0b' prefix
===========================================
Integer constants can be written as binary constants, consisting of a
sequence of '0' and '1' digits, prefixed by '0b' or '0B'. This is
particularly useful in environments that operate a lot on the bit-level
(like microcontrollers).
The following statements are identical:
i = 42;
i = 0x2a;
i = 052;
i = 0b101010;
The type of these constants follows the same rules as for octal or
hexadecimal integer constants, so suffixes like 'L' or 'UL' can be
applied.

File: gcc.info, Node: C++ Extensions, Next: Objective-C, Prev: C Extensions, Up: Top
6 Extensions to the C++ Language
********************************
The GNU compiler provides these extensions to the C++ language (and you
can also use most of the C language extensions in your C++ programs).
If you want to write code that checks whether these features are
available, you can test for the GNU compiler the same way as for C
programs: check for a predefined macro '__GNUC__'. You can also use
'__GNUG__' to test specifically for GNU C++ (*note Predefined Macros:
(cpp)Common Predefined Macros.).
* Menu:
* Volatiles:: What constitutes an access to a volatile object.
* Restricted Pointers:: C99 restricted pointers and references.
* Vague Linkage:: Where G++ puts inlines, vtables and such.
* C++ Interface:: You can use a single C++ header file for both
declarations and definitions.
* Template Instantiation:: Methods for ensuring that exactly one copy of
each needed template instantiation is emitted.
* Bound member functions:: You can extract a function pointer to the
method denoted by a '->*' or '.*' expression.
* C++ Attributes:: Variable, function, and type attributes for C++ only.
* Namespace Association:: Strong using-directives for namespace association.
* Type Traits:: Compiler support for type traits
* Java Exceptions:: Tweaking exception handling to work with Java.
* Deprecated Features:: Things will disappear from g++.
* Backwards Compatibility:: Compatibilities with earlier definitions of C++.

File: gcc.info, Node: Volatiles, Next: Restricted Pointers, Up: C++ Extensions
6.1 When is a Volatile Object Accessed?
=======================================
Both the C and C++ standard have the concept of volatile objects. These
are normally accessed by pointers and used for accessing hardware. The
standards encourage compilers to refrain from optimizations concerning
accesses to volatile objects. The C standard leaves it implementation
defined as to what constitutes a volatile access. The C++ standard
omits to specify this, except to say that C++ should behave in a similar
manner to C with respect to volatiles, where possible. The minimum
either standard specifies is that at a sequence point all previous
accesses to volatile objects have stabilized and no subsequent accesses
have occurred. Thus an implementation is free to reorder and combine
volatile accesses which occur between sequence points, but cannot do so
for accesses across a sequence point. The use of volatiles does not
allow you to violate the restriction on updating objects multiple times
within a sequence point.
*Note Volatile qualifier and the C compiler: Qualifiers implementation.
The behavior differs slightly between C and C++ in the non-obvious
cases:
volatile int *src = SOMEVALUE;
*src;
With C, such expressions are rvalues, and GCC interprets this either as
a read of the volatile object being pointed to or only as request to
evaluate the side-effects. The C++ standard specifies that such
expressions do not undergo lvalue to rvalue conversion, and that the
type of the dereferenced object may be incomplete. The C++ standard
does not specify explicitly that it is this lvalue to rvalue conversion
which may be responsible for causing an access. However, there is
reason to believe that it is, because otherwise certain simple
expressions become undefined. However, because it would surprise most
programmers, G++ treats dereferencing a pointer to volatile object of
complete type when the value is unused as GCC would do for an equivalent
type in C. When the object has incomplete type, G++ issues a warning;
if you wish to force an error, you must force a conversion to rvalue
with, for instance, a static cast.
When using a reference to volatile, G++ does not treat equivalent
expressions as accesses to volatiles, but instead issues a warning that
no volatile is accessed. The rationale for this is that otherwise it
becomes difficult to determine where volatile access occur, and not
possible to ignore the return value from functions returning volatile
references. Again, if you wish to force a read, cast the reference to
an rvalue.

File: gcc.info, Node: Restricted Pointers, Next: Vague Linkage, Prev: Volatiles, Up: C++ Extensions
6.2 Restricting Pointer Aliasing
================================
As with the C front end, G++ understands the C99 feature of restricted
pointers, specified with the '__restrict__', or '__restrict' type
qualifier. Because you cannot compile C++ by specifying the '-std=c99'
language flag, 'restrict' is not a keyword in C++.
In addition to allowing restricted pointers, you can specify restricted
references, which indicate that the reference is not aliased in the
local context.
void fn (int *__restrict__ rptr, int &__restrict__ rref)
{
/* ... */
}
In the body of 'fn', RPTR points to an unaliased integer and RREF refers
to a (different) unaliased integer.
You may also specify whether a member function's THIS pointer is
unaliased by using '__restrict__' as a member function qualifier.
void T::fn () __restrict__
{
/* ... */
}
Within the body of 'T::fn', THIS will have the effective definition 'T
*__restrict__ const this'. Notice that the interpretation of a
'__restrict__' member function qualifier is different to that of 'const'
or 'volatile' qualifier, in that it is applied to the pointer rather
than the object. This is consistent with other compilers which
implement restricted pointers.
As with all outermost parameter qualifiers, '__restrict__' is ignored
in function definition matching. This means you only need to specify
'__restrict__' in a function definition, rather than in a function
prototype as well.

File: gcc.info, Node: Vague Linkage, Next: C++ Interface, Prev: Restricted Pointers, Up: C++ Extensions
6.3 Vague Linkage
=================
There are several constructs in C++ which require space in the object
file but are not clearly tied to a single translation unit. We say that
these constructs have "vague linkage". Typically such constructs are
emitted wherever they are needed, though sometimes we can be more
clever.
Inline Functions
Inline functions are typically defined in a header file which can
be included in many different compilations. Hopefully they can
usually be inlined, but sometimes an out-of-line copy is necessary,
if the address of the function is taken or if inlining fails. In
general, we emit an out-of-line copy in all translation units where
one is needed. As an exception, we only emit inline virtual
functions with the vtable, since it will always require a copy.
Local static variables and string constants used in an inline
function are also considered to have vague linkage, since they must
be shared between all inlined and out-of-line instances of the
function.
VTables
C++ virtual functions are implemented in most compilers using a
lookup table, known as a vtable. The vtable contains pointers to
the virtual functions provided by a class, and each object of the
class contains a pointer to its vtable (or vtables, in some
multiple-inheritance situations). If the class declares any
non-inline, non-pure virtual functions, the first one is chosen as
the "key method" for the class, and the vtable is only emitted in
the translation unit where the key method is defined.
_Note:_ If the chosen key method is later defined as inline, the
vtable will still be emitted in every translation unit which
defines it. Make sure that any inline virtuals are declared inline
in the class body, even if they are not defined there.
type_info objects
C++ requires information about types to be written out in order to
implement 'dynamic_cast', 'typeid' and exception handling. For
polymorphic classes (classes with virtual functions), the type_info
object is written out along with the vtable so that 'dynamic_cast'
can determine the dynamic type of a class object at runtime. For
all other types, we write out the type_info object when it is used:
when applying 'typeid' to an expression, throwing an object, or
referring to a type in a catch clause or exception specification.
Template Instantiations
Most everything in this section also applies to template
instantiations, but there are other options as well. *Note Where's
the Template?: Template Instantiation.
When used with GNU ld version 2.8 or later on an ELF system such as
GNU/Linux or Solaris 2, or on Microsoft Windows, duplicate copies of
these constructs will be discarded at link time. This is known as
COMDAT support.
On targets that don't support COMDAT, but do support weak symbols, GCC
will use them. This way one copy will override all the others, but the
unused copies will still take up space in the executable.
For targets which do not support either COMDAT or weak symbols, most
entities with vague linkage will be emitted as local symbols to avoid
duplicate definition errors from the linker. This will not happen for
local statics in inlines, however, as having multiple copies will almost
certainly break things.
*Note Declarations and Definitions in One Header: C++ Interface, for
another way to control placement of these constructs.

File: gcc.info, Node: C++ Interface, Next: Template Instantiation, Prev: Vague Linkage, Up: C++ Extensions
6.4 #pragma interface and implementation
========================================
'#pragma interface' and '#pragma implementation' provide the user with a
way of explicitly directing the compiler to emit entities with vague
linkage (and debugging information) in a particular translation unit.
_Note:_ As of GCC 2.7.2, these '#pragma's are not useful in most cases,
because of COMDAT support and the "key method" heuristic mentioned in
*note Vague Linkage::. Using them can actually cause your program to
grow due to unnecessary out-of-line copies of inline functions.
Currently (3.4) the only benefit of these '#pragma's is reduced
duplication of debugging information, and that should be addressed soon
on DWARF 2 targets with the use of COMDAT groups.
'#pragma interface'
'#pragma interface "SUBDIR/OBJECTS.h"'
Use this directive in _header files_ that define object classes, to
save space in most of the object files that use those classes.
Normally, local copies of certain information (backup copies of
inline member functions, debugging information, and the internal
tables that implement virtual functions) must be kept in each
object file that includes class definitions. You can use this
pragma to avoid such duplication. When a header file containing
'#pragma interface' is included in a compilation, this auxiliary
information will not be generated (unless the main input source
file itself uses '#pragma implementation'). Instead, the object
files will contain references to be resolved at link time.
The second form of this directive is useful for the case where you
have multiple headers with the same name in different directories.
If you use this form, you must specify the same string to '#pragma
implementation'.
'#pragma implementation'
'#pragma implementation "OBJECTS.h"'
Use this pragma in a _main input file_, when you want full output
from included header files to be generated (and made globally
visible). The included header file, in turn, should use '#pragma
interface'. Backup copies of inline member functions, debugging
information, and the internal tables used to implement virtual
functions are all generated in implementation files.
If you use '#pragma implementation' with no argument, it applies to
an include file with the same basename(1) as your source file. For
example, in 'allclass.cc', giving just '#pragma implementation' by
itself is equivalent to '#pragma implementation "allclass.h"'.
In versions of GNU C++ prior to 2.6.0 'allclass.h' was treated as
an implementation file whenever you would include it from
'allclass.cc' even if you never specified '#pragma implementation'.
This was deemed to be more trouble than it was worth, however, and
disabled.
Use the string argument if you want a single implementation file to
include code from multiple header files. (You must also use
'#include' to include the header file; '#pragma implementation'
only specifies how to use the file--it doesn't actually include
it.)
There is no way to split up the contents of a single header file
into multiple implementation files.
'#pragma implementation' and '#pragma interface' also have an effect on
function inlining.
If you define a class in a header file marked with '#pragma interface',
the effect on an inline function defined in that class is similar to an
explicit 'extern' declaration--the compiler emits no code at all to
define an independent version of the function. Its definition is used
only for inlining with its callers.
Conversely, when you include the same header file in a main source file
that declares it as '#pragma implementation', the compiler emits code
for the function itself; this defines a version of the function that can
be found via pointers (or by callers compiled without inlining). If all
calls to the function can be inlined, you can avoid emitting the
function by compiling with '-fno-implement-inlines'. If any calls were
not inlined, you will get linker errors.
---------- Footnotes ----------
(1) A file's "basename" was the name stripped of all leading path
information and of trailing suffixes, such as '.h' or '.C' or '.cc'.

File: gcc.info, Node: Template Instantiation, Next: Bound member functions, Prev: C++ Interface, Up: C++ Extensions
6.5 Where's the Template?
=========================
C++ templates are the first language feature to require more
intelligence from the environment than one usually finds on a UNIX
system. Somehow the compiler and linker have to make sure that each
template instance occurs exactly once in the executable if it is needed,
and not at all otherwise. There are two basic approaches to this
problem, which are referred to as the Borland model and the Cfront
model.
Borland model
Borland C++ solved the template instantiation problem by adding the
code equivalent of common blocks to their linker; the compiler
emits template instances in each translation unit that uses them,
and the linker collapses them together. The advantage of this
model is that the linker only has to consider the object files
themselves; there is no external complexity to worry about. This
disadvantage is that compilation time is increased because the
template code is being compiled repeatedly. Code written for this
model tends to include definitions of all templates in the header
file, since they must be seen to be instantiated.
Cfront model
The AT&T C++ translator, Cfront, solved the template instantiation
problem by creating the notion of a template repository, an
automatically maintained place where template instances are stored.
A more modern version of the repository works as follows: As
individual object files are built, the compiler places any template
definitions and instantiations encountered in the repository. At
link time, the link wrapper adds in the objects in the repository
and compiles any needed instances that were not previously emitted.
The advantages of this model are more optimal compilation speed and
the ability to use the system linker; to implement the Borland
model a compiler vendor also needs to replace the linker. The
disadvantages are vastly increased complexity, and thus potential
for error; for some code this can be just as transparent, but in
practice it can been very difficult to build multiple programs in
one directory and one program in multiple directories. Code
written for this model tends to separate definitions of non-inline
member templates into a separate file, which should be compiled
separately.
When used with GNU ld version 2.8 or later on an ELF system such as
GNU/Linux or Solaris 2, or on Microsoft Windows, G++ supports the
Borland model. On other systems, G++ implements neither automatic
model.
A future version of G++ will support a hybrid model whereby the
compiler will emit any instantiations for which the template definition
is included in the compile, and store template definitions and
instantiation context information into the object file for the rest.
The link wrapper will extract that information as necessary and invoke
the compiler to produce the remaining instantiations. The linker will
then combine duplicate instantiations.
In the mean time, you have the following options for dealing with
template instantiations:
1. Compile your template-using code with '-frepo'. The compiler will
generate files with the extension '.rpo' listing all of the
template instantiations used in the corresponding object files
which could be instantiated there; the link wrapper, 'collect2',
will then update the '.rpo' files to tell the compiler where to
place those instantiations and rebuild any affected object files.
The link-time overhead is negligible after the first pass, as the
compiler will continue to place the instantiations in the same
files.
This is your best option for application code written for the
Borland model, as it will just work. Code written for the Cfront
model will need to be modified so that the template definitions are
available at one or more points of instantiation; usually this is
as simple as adding '#include <tmethods.cc>' to the end of each
template header.
For library code, if you want the library to provide all of the
template instantiations it needs, just try to link all of its
object files together; the link will fail, but cause the
instantiations to be generated as a side effect. Be warned,
however, that this may cause conflicts if multiple libraries try to
provide the same instantiations. For greater control, use explicit
instantiation as described in the next option.
2. Compile your code with '-fno-implicit-templates' to disable the
implicit generation of template instances, and explicitly
instantiate all the ones you use. This approach requires more
knowledge of exactly which instances you need than do the others,
but it's less mysterious and allows greater control. You can
scatter the explicit instantiations throughout your program,
perhaps putting them in the translation units where the instances
are used or the translation units that define the templates
themselves; you can put all of the explicit instantiations you need
into one big file; or you can create small files like
#include "Foo.h"
#include "Foo.cc"
template class Foo<int>;
template ostream& operator <<
(ostream&, const Foo<int>&);
for each of the instances you need, and create a template
instantiation library from those.
If you are using Cfront-model code, you can probably get away with
not using '-fno-implicit-templates' when compiling files that don't
'#include' the member template definitions.
If you use one big file to do the instantiations, you may want to
compile it without '-fno-implicit-templates' so you get all of the
instances required by your explicit instantiations (but not by any
other files) without having to specify them as well.
G++ has extended the template instantiation syntax given in the ISO
standard to allow forward declaration of explicit instantiations
(with 'extern'), instantiation of the compiler support data for a
template class (i.e. the vtable) without instantiating any of its
members (with 'inline'), and instantiation of only the static data
members of a template class, without the support data or member
functions (with ('static'):
extern template int max (int, int);
inline template class Foo<int>;
static template class Foo<int>;
3. Do nothing. Pretend G++ does implement automatic instantiation
management. Code written for the Borland model will work fine, but
each translation unit will contain instances of each of the
templates it uses. In a large program, this can lead to an
unacceptable amount of code duplication.

File: gcc.info, Node: Bound member functions, Next: C++ Attributes, Prev: Template Instantiation, Up: C++ Extensions
6.6 Extracting the function pointer from a bound pointer to member function
===========================================================================
In C++, pointer to member functions (PMFs) are implemented using a wide
pointer of sorts to handle all the possible call mechanisms; the PMF
needs to store information about how to adjust the 'this' pointer, and
if the function pointed to is virtual, where to find the vtable, and
where in the vtable to look for the member function. If you are using
PMFs in an inner loop, you should really reconsider that decision. If
that is not an option, you can extract the pointer to the function that
would be called for a given object/PMF pair and call it directly inside
the inner loop, to save a bit of time.
Note that you will still be paying the penalty for the call through a
function pointer; on most modern architectures, such a call defeats the
branch prediction features of the CPU. This is also true of normal
virtual function calls.
The syntax for this extension is
extern A a;
extern int (A::*fp)();
typedef int (*fptr)(A *);
fptr p = (fptr)(a.*fp);
For PMF constants (i.e. expressions of the form '&Klasse::Member'), no
object is needed to obtain the address of the function. They can be
converted to function pointers directly:
fptr p1 = (fptr)(&A::foo);
You must specify '-Wno-pmf-conversions' to use this extension.

File: gcc.info, Node: C++ Attributes, Next: Namespace Association, Prev: Bound member functions, Up: C++ Extensions
6.7 C++-Specific Variable, Function, and Type Attributes
========================================================
Some attributes only make sense for C++ programs.
'init_priority (PRIORITY)'
In Standard C++, objects defined at namespace scope are guaranteed
to be initialized in an order in strict accordance with that of
their definitions _in a given translation unit_. No guarantee is
made for initializations across translation units. However, GNU
C++ allows users to control the order of initialization of objects
defined at namespace scope with the 'init_priority' attribute by
specifying a relative PRIORITY, a constant integral expression
currently bounded between 101 and 65535 inclusive. Lower numbers
indicate a higher priority.
In the following example, 'A' would normally be created before 'B',
but the 'init_priority' attribute has reversed that order:
Some_Class A __attribute__ ((init_priority (2000)));
Some_Class B __attribute__ ((init_priority (543)));
Note that the particular values of PRIORITY do not matter; only
their relative ordering.
'java_interface'
This type attribute informs C++ that the class is a Java interface.
It may only be applied to classes declared within an 'extern
"Java"' block. Calls to methods declared in this interface will be
dispatched using GCJ's interface table mechanism, instead of
regular virtual table dispatch.
See also *Note Namespace Association::.

File: gcc.info, Node: Namespace Association, Next: Type Traits, Prev: C++ Attributes, Up: C++ Extensions
6.8 Namespace Association
=========================
*Caution:* The semantics of this extension are not fully defined. Users
should refrain from using this extension as its semantics may change
subtly over time. It is possible that this extension will be removed in
future versions of G++.
A using-directive with '__attribute ((strong))' is stronger than a
normal using-directive in two ways:
* Templates from the used namespace can be specialized and explicitly
instantiated as though they were members of the using namespace.
* The using namespace is considered an associated namespace of all
templates in the used namespace for purposes of argument-dependent
name lookup.
The used namespace must be nested within the using namespace so that
normal unqualified lookup works properly.
This is useful for composing a namespace transparently from
implementation namespaces. For example:
namespace std {
namespace debug {
template <class T> struct A { };
}
using namespace debug __attribute ((__strong__));
template <> struct A<int> { }; // ok to specialize
template <class T> void f (A<T>);
}
int main()
{
f (std::A<float>()); // lookup finds std::f
f (std::A<int>());
}

File: gcc.info, Node: Type Traits, Next: Java Exceptions, Prev: Namespace Association, Up: C++ Extensions
6.9 Type Traits
===============
The C++ front-end implements syntactic extensions that allow to
determine at compile time various characteristics of a type (or of a
pair of types).
'__has_nothrow_assign (type)'
If 'type' is const qualified or is a reference type then the trait
is false. Otherwise if '__has_trivial_assign (type)' is true then
the trait is true, else if 'type' is a cv class or union type with
copy assignment operators that are known not to throw an exception
then the trait is true, else it is false. Requires: 'type' shall
be a complete type, an array type of unknown bound, or is a 'void'
type.
'__has_nothrow_copy (type)'
If '__has_trivial_copy (type)' is true then the trait is true, else
if 'type' is a cv class or union type with copy constructors that
are known not to throw an exception then the trait is true, else it
is false. Requires: 'type' shall be a complete type, an array type
of unknown bound, or is a 'void' type.
'__has_nothrow_constructor (type)'
If '__has_trivial_constructor (type)' is true then the trait is
true, else if 'type' is a cv class or union type (or array thereof)
with a default constructor that is known not to throw an exception
then the trait is true, else it is false. Requires: 'type' shall
be a complete type, an array type of unknown bound, or is a 'void'
type.
'__has_trivial_assign (type)'
If 'type' is const qualified or is a reference type then the trait
is false. Otherwise if '__is_pod (type)' is true then the trait is
true, else if 'type' is a cv class or union type with a trivial
copy assignment ([class.copy]) then the trait is true, else it is
false. Requires: 'type' shall be a complete type, an array type of
unknown bound, or is a 'void' type.
'__has_trivial_copy (type)'
If '__is_pod (type)' is true or 'type' is a reference type then the
trait is true, else if 'type' is a cv class or union type with a
trivial copy constructor ([class.copy]) then the trait is true,
else it is false. Requires: 'type' shall be a complete type, an
array type of unknown bound, or is a 'void' type.
'__has_trivial_constructor (type)'
If '__is_pod (type)' is true then the trait is true, else if 'type'
is a cv class or union type (or array thereof) with a trivial
default constructor ([class.ctor]) then the trait is true, else it
is false. Requires: 'type' shall be a complete type, an array type
of unknown bound, or is a 'void' type.
'__has_trivial_destructor (type)'
If '__is_pod (type)' is true or 'type' is a reference type then the
trait is true, else if 'type' is a cv class or union type (or array
thereof) with a trivial destructor ([class.dtor]) then the trait is
true, else it is false. Requires: 'type' shall be a complete type,
an array type of unknown bound, or is a 'void' type.
'__has_virtual_destructor (type)'
If 'type' is a class type with a virtual destructor ([class.dtor])
then the trait is true, else it is false. Requires: 'type' shall
be a complete type, an array type of unknown bound, or is a 'void'
type.
'__is_abstract (type)'
If 'type' is an abstract class ([class.abstract]) then the trait is
true, else it is false. Requires: 'type' shall be a complete type,
an array type of unknown bound, or is a 'void' type.
'__is_base_of (base_type, derived_type)'
If 'base_type' is a base class of 'derived_type' ([class.derived])
then the trait is true, otherwise it is false. Top-level cv
qualifications of 'base_type' and 'derived_type' are ignored. For
the purposes of this trait, a class type is considered is own base.
Requires: if '__is_class (base_type)' and '__is_class
(derived_type)' are true and 'base_type' and 'derived_type' are not
the same type (disregarding cv-qualifiers), 'derived_type' shall be
a complete type. Diagnostic is produced if this requirement is not
met.
'__is_class (type)'
If 'type' is a cv class type, and not a union type
([basic.compound]) the the trait is true, else it is false.
'__is_empty (type)'
If '__is_class (type)' is false then the trait is false. Otherwise
'type' is considered empty if and only if: 'type' has no non-static
data members, or all non-static data members, if any, are
bit-fields of lenght 0, and 'type' has no virtual members, and
'type' has no virtual base classes, and 'type' has no base classes
'base_type' for which '__is_empty (base_type)' is false. Requires:
'type' shall be a complete type, an array type of unknown bound, or
is a 'void' type.
'__is_enum (type)'
If 'type' is a cv enumeration type ([basic.compound]) the the trait
is true, else it is false.
'__is_pod (type)'
If 'type' is a cv POD type ([basic.types]) then the trait is true,
else it is false. Requires: 'type' shall be a complete type, an
array type of unknown bound, or is a 'void' type.
'__is_polymorphic (type)'
If 'type' is a polymorphic class ([class.virtual]) then the trait
is true, else it is false. Requires: 'type' shall be a complete
type, an array type of unknown bound, or is a 'void' type.
'__is_union (type)'
If 'type' is a cv union type ([basic.compound]) the the trait is
true, else it is false.

File: gcc.info, Node: Java Exceptions, Next: Deprecated Features, Prev: Type Traits, Up: C++ Extensions
6.10 Java Exceptions
====================
The Java language uses a slightly different exception handling model
from C++. Normally, GNU C++ will automatically detect when you are
writing C++ code that uses Java exceptions, and handle them
appropriately. However, if C++ code only needs to execute destructors
when Java exceptions are thrown through it, GCC will guess incorrectly.
Sample problematic code is:
struct S { ~S(); };
extern void bar(); // is written in Java, and may throw exceptions
void foo()
{
S s;
bar();
}
The usual effect of an incorrect guess is a link failure, complaining of
a missing routine called '__gxx_personality_v0'.
You can inform the compiler that Java exceptions are to be used in a
translation unit, irrespective of what it might think, by writing
'#pragma GCC java_exceptions' at the head of the file. This '#pragma'
must appear before any functions that throw or catch exceptions, or run
destructors when exceptions are thrown through them.
You cannot mix Java and C++ exceptions in the same translation unit.
It is believed to be safe to throw a C++ exception from one file through
another file compiled for the Java exception model, or vice versa, but
there may be bugs in this area.

File: gcc.info, Node: Deprecated Features, Next: Backwards Compatibility, Prev: Java Exceptions, Up: C++ Extensions
6.11 Deprecated Features
========================
In the past, the GNU C++ compiler was extended to experiment with new
features, at a time when the C++ language was still evolving. Now that
the C++ standard is complete, some of those features are superseded by
superior alternatives. Using the old features might cause a warning in
some cases that the feature will be dropped in the future. In other
cases, the feature might be gone already.
While the list below is not exhaustive, it documents some of the
options that are now deprecated:
'-fexternal-templates'
'-falt-external-templates'
These are two of the many ways for G++ to implement template
instantiation. *Note Template Instantiation::. The C++ standard
clearly defines how template definitions have to be organized
across implementation units. G++ has an implicit instantiation
mechanism that should work just fine for standard-conforming code.
'-fstrict-prototype'
'-fno-strict-prototype'
Previously it was possible to use an empty prototype parameter list
to indicate an unspecified number of parameters (like C), rather
than no parameters, as C++ demands. This feature has been removed,
except where it is required for backwards compatibility *Note
Backwards Compatibility::.
G++ allows a virtual function returning 'void *' to be overridden by
one returning a different pointer type. This extension to the covariant
return type rules is now deprecated and will be removed from a future
version.
The G++ minimum and maximum operators ('<?' and '>?') and their
compound forms ('<?=') and '>?=') have been deprecated and are now
removed from G++. Code using these operators should be modified to use
'std::min' and 'std::max' instead.
The named return value extension has been deprecated, and is now
removed from G++.
The use of initializer lists with new expressions has been deprecated,
and is now removed from G++.
Floating and complex non-type template parameters have been deprecated,
and are now removed from G++.
The implicit typename extension has been deprecated and is now removed
from G++.
The use of default arguments in function pointers, function typedefs
and other places where they are not permitted by the standard is
deprecated and will be removed from a future version of G++.
G++ allows floating-point literals to appear in integral constant
expressions, e.g. ' enum E { e = int(2.2 * 3.7) } ' This extension is
deprecated and will be removed from a future version.
G++ allows static data members of const floating-point type to be
declared with an initializer in a class definition. The standard only
allows initializers for static members of const integral types and const
enumeration types so this extension has been deprecated and will be
removed from a future version.

File: gcc.info, Node: Backwards Compatibility, Prev: Deprecated Features, Up: C++ Extensions
6.12 Backwards Compatibility
============================
Now that there is a definitive ISO standard C++, G++ has a specification
to adhere to. The C++ language evolved over time, and features that
used to be acceptable in previous drafts of the standard, such as the
ARM [Annotated C++ Reference Manual], are no longer accepted. In order
to allow compilation of C++ written to such drafts, G++ contains some
backwards compatibilities. _All such backwards compatibility features
are liable to disappear in future versions of G++._ They should be
considered deprecated *Note Deprecated Features::.
'For scope'
If a variable is declared at for scope, it used to remain in scope
until the end of the scope which contained the for statement
(rather than just within the for scope). G++ retains this, but
issues a warning, if such a variable is accessed outside the for
scope.
'Implicit C language'
Old C system header files did not contain an 'extern "C" {...}'
scope to set the language. On such systems, all header files are
implicitly scoped inside a C language scope. Also, an empty
prototype '()' will be treated as an unspecified number of
arguments, rather than no arguments, as C++ demands.

File: gcc.info, Node: Objective-C, Next: Compatibility, Prev: C++ Extensions, Up: Top
7 GNU Objective-C runtime features
**********************************
This document is meant to describe some of the GNU Objective-C runtime
features. It is not intended to teach you Objective-C, there are
several resources on the Internet that present the language. Questions
and comments about this document to Ovidiu Predescu <ovidiu@cup.hp.com>.
* Menu:
* Executing code before main::
* Type encoding::
* Garbage Collection::
* Constant string objects::
* compatibility_alias::

File: gcc.info, Node: Executing code before main, Next: Type encoding, Prev: Objective-C, Up: Objective-C
7.1 '+load': Executing code before main
=======================================
The GNU Objective-C runtime provides a way that allows you to execute
code before the execution of the program enters the 'main' function.
The code is executed on a per-class and a per-category basis, through a
special class method '+load'.
This facility is very useful if you want to initialize global variables
which can be accessed by the program directly, without sending a message
to the class first. The usual way to initialize global variables, in
the '+initialize' method, might not be useful because '+initialize' is
only called when the first message is sent to a class object, which in
some cases could be too late.
Suppose for example you have a 'FileStream' class that declares
'Stdin', 'Stdout' and 'Stderr' as global variables, like below:
FileStream *Stdin = nil;
FileStream *Stdout = nil;
FileStream *Stderr = nil;
@implementation FileStream
+ (void)initialize
{
Stdin = [[FileStream new] initWithFd:0];
Stdout = [[FileStream new] initWithFd:1];
Stderr = [[FileStream new] initWithFd:2];
}
/* Other methods here */
@end
In this example, the initialization of 'Stdin', 'Stdout' and 'Stderr'
in '+initialize' occurs too late. The programmer can send a message to
one of these objects before the variables are actually initialized, thus
sending messages to the 'nil' object. The '+initialize' method which
actually initializes the global variables is not invoked until the first
message is sent to the class object. The solution would require these
variables to be initialized just before entering 'main'.
The correct solution of the above problem is to use the '+load' method
instead of '+initialize':
@implementation FileStream
+ (void)load
{
Stdin = [[FileStream new] initWithFd:0];
Stdout = [[FileStream new] initWithFd:1];
Stderr = [[FileStream new] initWithFd:2];
}
/* Other methods here */
@end
The '+load' is a method that is not overridden by categories. If a
class and a category of it both implement '+load', both methods are
invoked. This allows some additional initializations to be performed in
a category.
This mechanism is not intended to be a replacement for '+initialize'.
You should be aware of its limitations when you decide to use it instead
of '+initialize'.
* Menu:
* What you can and what you cannot do in +load::

File: gcc.info, Node: What you can and what you cannot do in +load, Prev: Executing code before main, Up: Executing code before main
7.1.1 What you can and what you cannot do in '+load'
----------------------------------------------------
The '+load' implementation in the GNU runtime guarantees you the
following things:
* you can write whatever C code you like;
* you can send messages to Objective-C constant strings ('@"this is a
constant string"');
* you can allocate and send messages to objects whose class is
implemented in the same file;
* the '+load' implementation of all super classes of a class are
executed before the '+load' of that class is executed;
* the '+load' implementation of a class is executed before the
'+load' implementation of any category.
In particular, the following things, even if they can work in a
particular case, are not guaranteed:
* allocation of or sending messages to arbitrary objects;
* allocation of or sending messages to objects whose classes have a
category implemented in the same file;
You should make no assumptions about receiving '+load' in sibling
classes when you write '+load' of a class. The order in which sibling
classes receive '+load' is not guaranteed.
The order in which '+load' and '+initialize' are called could be
problematic if this matters. If you don't allocate objects inside
'+load', it is guaranteed that '+load' is called before '+initialize'.
If you create an object inside '+load' the '+initialize' method of
object's class is invoked even if '+load' was not invoked. Note if you
explicitly call '+load' on a class, '+initialize' will be called first.
To avoid possible problems try to implement only one of these methods.
The '+load' method is also invoked when a bundle is dynamically loaded
into your running program. This happens automatically without any
intervening operation from you. When you write bundles and you need to
write '+load' you can safely create and send messages to objects whose
classes already exist in the running program. The same restrictions as
above apply to classes defined in bundle.

File: gcc.info, Node: Type encoding, Next: Garbage Collection, Prev: Executing code before main, Up: Objective-C
7.2 Type encoding
=================
The Objective-C compiler generates type encodings for all the types.
These type encodings are used at runtime to find out information about
selectors and methods and about objects and classes.
The types are encoded in the following way:
'_Bool' 'B'
'char' 'c'
'unsigned char' 'C'
'short' 's'
'unsigned short' 'S'
'int' 'i'
'unsigned int' 'I'
'long' 'l'
'unsigned long' 'L'
'long long' 'q'
'unsigned long 'Q'
long'
'float' 'f'
'double' 'd'
'void' 'v'
'id' '@'
'Class' '#'
'SEL' ':'
'char*' '*'
unknown type '?'
Complex types 'j' followed by the inner type. For example
'_Complex double' is encoded as "jd".
bit-fields 'b' followed by the starting position of the
bit-field, the type of the bit-field and the size of
the bit-field (the bit-fields encoding was changed
from the NeXT's compiler encoding, see below)
The encoding of bit-fields has changed to allow bit-fields to be
properly handled by the runtime functions that compute sizes and
alignments of types that contain bit-fields. The previous encoding
contained only the size of the bit-field. Using only this information
it is not possible to reliably compute the size occupied by the
bit-field. This is very important in the presence of the Boehm's
garbage collector because the objects are allocated using the typed
memory facility available in this collector. The typed memory
allocation requires information about where the pointers are located
inside the object.
The position in the bit-field is the position, counting in bits, of the
bit closest to the beginning of the structure.
The non-atomic types are encoded as follows:
pointers '^' followed by the pointed type.
arrays '[' followed by the number of elements in the array
followed by the type of the elements followed by ']'
structures '{' followed by the name of the structure (or '?' if the
structure is unnamed), the '=' sign, the type of the
members and by '}'
unions '(' followed by the name of the structure (or '?' if the
union is unnamed), the '=' sign, the type of the members
followed by ')'
Here are some types and their encodings, as they are generated by the
compiler on an i386 machine:
Objective-C type Compiler encoding
int a[10]; '[10i]'
struct { '{?=i[3f]b128i3b131i2c}'
int i;
float f[3];
int a:3;
int b:2;
char c;
}
In addition to the types the compiler also encodes the type specifiers.
The table below describes the encoding of the current Objective-C type
specifiers:
Specifier Encoding
'const' 'r'
'in' 'n'
'inout' 'N'
'out' 'o'
'bycopy' 'O'
'oneway' 'V'
The type specifiers are encoded just before the type. Unlike types
however, the type specifiers are only encoded when they appear in method
argument types.

File: gcc.info, Node: Garbage Collection, Next: Constant string objects, Prev: Type encoding, Up: Objective-C
7.3 Garbage Collection
======================
Support for a new memory management policy has been added by using a
powerful conservative garbage collector, known as the
Boehm-Demers-Weiser conservative garbage collector. It is available
from <http://www.hpl.hp.com/personal/Hans_Boehm/gc/>.
To enable the support for it you have to configure the compiler using
an additional argument, '--enable-objc-gc'. You need to have garbage
collector installed before building the compiler. This will build an
additional runtime library which has several enhancements to support the
garbage collector. The new library has a new name, 'libobjc_gc.a' to
not conflict with the non-garbage-collected library.
When the garbage collector is used, the objects are allocated using the
so-called typed memory allocation mechanism available in the
Boehm-Demers-Weiser collector. This mode requires precise information
on where pointers are located inside objects. This information is
computed once per class, immediately after the class has been
initialized.
There is a new runtime function 'class_ivar_set_gcinvisible()' which
can be used to declare a so-called "weak pointer" reference. Such a
pointer is basically hidden for the garbage collector; this can be
useful in certain situations, especially when you want to keep track of
the allocated objects, yet allow them to be collected. This kind of
pointers can only be members of objects, you cannot declare a global
pointer as a weak reference. Every type which is a pointer type can be
declared a weak pointer, including 'id', 'Class' and 'SEL'.
Here is an example of how to use this feature. Suppose you want to
implement a class whose instances hold a weak pointer reference; the
following class does this:
@interface WeakPointer : Object
{
const void* weakPointer;
}
- initWithPointer:(const void*)p;
- (const void*)weakPointer;
@end
@implementation WeakPointer
+ (void)initialize
{
class_ivar_set_gcinvisible (self, "weakPointer", YES);
}
- initWithPointer:(const void*)p
{
weakPointer = p;
return self;
}
- (const void*)weakPointer
{
return weakPointer;
}
@end
Weak pointers are supported through a new type character specifier
represented by the '!' character. The 'class_ivar_set_gcinvisible()'
function adds or removes this specifier to the string type description
of the instance variable named as argument.

File: gcc.info, Node: Constant string objects, Next: compatibility_alias, Prev: Garbage Collection, Up: Objective-C
7.4 Constant string objects
===========================
GNU Objective-C provides constant string objects that are generated
directly by the compiler. You declare a constant string object by
prefixing a C constant string with the character '@':
id myString = @"this is a constant string object";
The constant string objects are by default instances of the
'NXConstantString' class which is provided by the GNU Objective-C
runtime. To get the definition of this class you must include the
'objc/NXConstStr.h' header file.
User defined libraries may want to implement their own constant string
class. To be able to support them, the GNU Objective-C compiler
provides a new command line options
'-fconstant-string-class=CLASS-NAME'. The provided class should adhere
to a strict structure, the same as 'NXConstantString''s structure:
@interface MyConstantStringClass
{
Class isa;
char *c_string;
unsigned int len;
}
@end
'NXConstantString' inherits from 'Object'; user class libraries may
choose to inherit the customized constant string class from a different
class than 'Object'. There is no requirement in the methods the
constant string class has to implement, but the final ivar layout of the
class must be the compatible with the given structure.
When the compiler creates the statically allocated constant string
object, the 'c_string' field will be filled by the compiler with the
string; the 'length' field will be filled by the compiler with the
string length; the 'isa' pointer will be filled with 'NULL' by the
compiler, and it will later be fixed up automatically at runtime by the
GNU Objective-C runtime library to point to the class which was set by
the '-fconstant-string-class' option when the object file is loaded (if
you wonder how it works behind the scenes, the name of the class to use,
and the list of static objects to fixup, are stored by the compiler in
the object file in a place where the GNU runtime library will find them
at runtime).
As a result, when a file is compiled with the '-fconstant-string-class'
option, all the constant string objects will be instances of the class
specified as argument to this option. It is possible to have multiple
compilation units referring to different constant string classes,
neither the compiler nor the linker impose any restrictions in doing
this.

File: gcc.info, Node: compatibility_alias, Prev: Constant string objects, Up: Objective-C
7.5 compatibility_alias
=======================
This is a feature of the Objective-C compiler rather than of the
runtime, anyway since it is documented nowhere and its existence was
forgotten, we are documenting it here.
The keyword '@compatibility_alias' allows you to define a class name as
equivalent to another class name. For example:
@compatibility_alias WOApplication GSWApplication;
tells the compiler that each time it encounters 'WOApplication' as a
class name, it should replace it with 'GSWApplication' (that is,
'WOApplication' is just an alias for 'GSWApplication').
There are some constraints on how this can be used--
* 'WOApplication' (the alias) must not be an existing class;
* 'GSWApplication' (the real class) must be an existing class.

File: gcc.info, Node: Compatibility, Next: Gcov, Prev: Objective-C, Up: Top
8 Binary Compatibility
**********************
Binary compatibility encompasses several related concepts:
"application binary interface (ABI)"
The set of runtime conventions followed by all of the tools that
deal with binary representations of a program, including compilers,
assemblers, linkers, and language runtime support. Some ABIs are
formal with a written specification, possibly designed by multiple
interested parties. Others are simply the way things are actually
done by a particular set of tools.
"ABI conformance"
A compiler conforms to an ABI if it generates code that follows all
of the specifications enumerated by that ABI. A library conforms
to an ABI if it is implemented according to that ABI. An
application conforms to an ABI if it is built using tools that
conform to that ABI and does not contain source code that
specifically changes behavior specified by the ABI.
"calling conventions"
Calling conventions are a subset of an ABI that specify of how
arguments are passed and function results are returned.
"interoperability"
Different sets of tools are interoperable if they generate files
that can be used in the same program. The set of tools includes
compilers, assemblers, linkers, libraries, header files, startup
files, and debuggers. Binaries produced by different sets of tools
are not interoperable unless they implement the same ABI. This
applies to different versions of the same tools as well as tools
from different vendors.
"intercallability"
Whether a function in a binary built by one set of tools can call a
function in a binary built by a different set of tools is a subset
of interoperability.
"implementation-defined features"
Language standards include lists of implementation-defined features
whose behavior can vary from one implementation to another. Some
of these features are normally covered by a platform's ABI and
others are not. The features that are not covered by an ABI
generally affect how a program behaves, but not intercallability.
"compatibility"
Conformance to the same ABI and the same behavior of
implementation-defined features are both relevant for
compatibility.
The application binary interface implemented by a C or C++ compiler
affects code generation and runtime support for:
* size and alignment of data types
* layout of structured types
* calling conventions
* register usage conventions
* interfaces for runtime arithmetic support
* object file formats
In addition, the application binary interface implemented by a C++
compiler affects code generation and runtime support for:
* name mangling
* exception handling
* invoking constructors and destructors
* layout, alignment, and padding of classes
* layout and alignment of virtual tables
Some GCC compilation options cause the compiler to generate code that
does not conform to the platform's default ABI. Other options cause
different program behavior for implementation-defined features that are
not covered by an ABI. These options are provided for consistency with
other compilers that do not follow the platform's default ABI or the
usual behavior of implementation-defined features for the platform. Be
very careful about using such options.
Most platforms have a well-defined ABI that covers C code, but ABIs
that cover C++ functionality are not yet common.
Starting with GCC 3.2, GCC binary conventions for C++ are based on a
written, vendor-neutral C++ ABI that was designed to be specific to
64-bit Itanium but also includes generic specifications that apply to
any platform. This C++ ABI is also implemented by other compiler
vendors on some platforms, notably GNU/Linux and BSD systems. We have
tried hard to provide a stable ABI that will be compatible with future
GCC releases, but it is possible that we will encounter problems that
make this difficult. Such problems could include different
interpretations of the C++ ABI by different vendors, bugs in the ABI, or
bugs in the implementation of the ABI in different compilers. GCC's
'-Wabi' switch warns when G++ generates code that is probably not
compatible with the C++ ABI.
The C++ library used with a C++ compiler includes the Standard C++
Library, with functionality defined in the C++ Standard, plus language
runtime support. The runtime support is included in a C++ ABI, but
there is no formal ABI for the Standard C++ Library. Two
implementations of that library are interoperable if one follows the
de-facto ABI of the other and if they are both built with the same
compiler, or with compilers that conform to the same ABI for C++
compiler and runtime support.
When G++ and another C++ compiler conform to the same C++ ABI, but the
implementations of the Standard C++ Library that they normally use do
not follow the same ABI for the Standard C++ Library, object files built
with those compilers can be used in the same program only if they use
the same C++ library. This requires specifying the location of the C++
library header files when invoking the compiler whose usual library is
not being used. The location of GCC's C++ header files depends on how
the GCC build was configured, but can be seen by using the G++ '-v'
option. With default configuration options for G++ 3.3 the compile line
for a different C++ compiler needs to include
-IGCC_INSTALL_DIRECTORY/include/c++/3.3
Similarly, compiling code with G++ that must use a C++ library other
than the GNU C++ library requires specifying the location of the header
files for that other library.
The most straightforward way to link a program to use a particular C++
library is to use a C++ driver that specifies that C++ library by
default. The 'g++' driver, for example, tells the linker where to find
GCC's C++ library ('libstdc++') plus the other libraries and startup
files it needs, in the proper order.
If a program must use a different C++ library and it's not possible to
do the final link using a C++ driver that uses that library by default,
it is necessary to tell 'g++' the location and name of that library. It
might also be necessary to specify different startup files and other
runtime support libraries, and to suppress the use of GCC's support
libraries with one or more of the options '-nostdlib', '-nostartfiles',
and '-nodefaultlibs'.

File: gcc.info, Node: Gcov, Next: Trouble, Prev: Compatibility, Up: Top
9 'gcov'--a Test Coverage Program
*********************************
'gcov' is a tool you can use in conjunction with GCC to test code
coverage in your programs.
* Menu:
* Gcov Intro:: Introduction to gcov.
* Invoking Gcov:: How to use gcov.
* Gcov and Optimization:: Using gcov with GCC optimization.
* Gcov Data Files:: The files used by gcov.
* Cross-profiling:: Data file relocation.

File: gcc.info, Node: Gcov Intro, Next: Invoking Gcov, Up: Gcov
9.1 Introduction to 'gcov'
==========================
'gcov' is a test coverage program. Use it in concert with GCC to
analyze your programs to help create more efficient, faster running code
and to discover untested parts of your program. You can use 'gcov' as a
profiling tool to help discover where your optimization efforts will
best affect your code. You can also use 'gcov' along with the other
profiling tool, 'gprof', to assess which parts of your code use the
greatest amount of computing time.
Profiling tools help you analyze your code's performance. Using a
profiler such as 'gcov' or 'gprof', you can find out some basic
performance statistics, such as:
* how often each line of code executes
* what lines of code are actually executed
* how much computing time each section of code uses
Once you know these things about how your code works when compiled, you
can look at each module to see which modules should be optimized.
'gcov' helps you determine where to work on optimization.
Software developers also use coverage testing in concert with
testsuites, to make sure software is actually good enough for a release.
Testsuites can verify that a program works as expected; a coverage
program tests to see how much of the program is exercised by the
testsuite. Developers can then determine what kinds of test cases need
to be added to the testsuites to create both better testing and a better
final product.
You should compile your code without optimization if you plan to use
'gcov' because the optimization, by combining some lines of code into
one function, may not give you as much information as you need to look
for 'hot spots' where the code is using a great deal of computer time.
Likewise, because 'gcov' accumulates statistics by line (at the lowest
resolution), it works best with a programming style that places only one
statement on each line. If you use complicated macros that expand to
loops or to other control structures, the statistics are less
helpful--they only report on the line where the macro call appears. If
your complex macros behave like functions, you can replace them with
inline functions to solve this problem.
'gcov' creates a logfile called 'SOURCEFILE.gcov' which indicates how
many times each line of a source file 'SOURCEFILE.c' has executed. You
can use these logfiles along with 'gprof' to aid in fine-tuning the
performance of your programs. 'gprof' gives timing information you can
use along with the information you get from 'gcov'.
'gcov' works only on code compiled with GCC. It is not compatible with
any other profiling or test coverage mechanism.

File: gcc.info, Node: Invoking Gcov, Next: Gcov and Optimization, Prev: Gcov Intro, Up: Gcov
9.2 Invoking 'gcov'
===================
gcov [OPTIONS] SOURCEFILES
'gcov' accepts the following options:
'-h'
'--help'
Display help about using 'gcov' (on the standard output), and exit
without doing any further processing.
'-v'
'--version'
Display the 'gcov' version number (on the standard output), and
exit without doing any further processing.
'-a'
'--all-blocks'
Write individual execution counts for every basic block. Normally
gcov outputs execution counts only for the main blocks of a line.
With this option you can determine if blocks within a single line
are not being executed.
'-b'
'--branch-probabilities'
Write branch frequencies to the output file, and write branch
summary info to the standard output. This option allows you to see
how often each branch in your program was taken. Unconditional
branches will not be shown, unless the '-u' option is given.
'-c'
'--branch-counts'
Write branch frequencies as the number of branches taken, rather
than the percentage of branches taken.
'-n'
'--no-output'
Do not create the 'gcov' output file.
'-l'
'--long-file-names'
Create long file names for included source files. For example, if
the header file 'x.h' contains code, and was included in the file
'a.c', then running 'gcov' on the file 'a.c' will produce an output
file called 'a.c##x.h.gcov' instead of 'x.h.gcov'. This can be
useful if 'x.h' is included in multiple source files. If you use
the '-p' option, both the including and included file names will be
complete path names.
'-p'
'--preserve-paths'
Preserve complete path information in the names of generated
'.gcov' files. Without this option, just the filename component is
used. With this option, all directories are used, with '/'
characters translated to '#' characters, '.' directory components
removed and '..' components renamed to '^'. This is useful if
sourcefiles are in several different directories. It also affects
the '-l' option.
'-f'
'--function-summaries'
Output summaries for each function in addition to the file level
summary.
'-o DIRECTORY|FILE'
'--object-directory DIRECTORY'
'--object-file FILE'
Specify either the directory containing the gcov data files, or the
object path name. The '.gcno', and '.gcda' data files are searched
for using this option. If a directory is specified, the data files
are in that directory and named after the source file name, without
its extension. If a file is specified here, the data files are
named after that file, without its extension. If this option is
not supplied, it defaults to the current directory.
'-u'
'--unconditional-branches'
When branch probabilities are given, include those of unconditional
branches. Unconditional branches are normally not interesting.
'gcov' should be run with the current directory the same as that when
you invoked the compiler. Otherwise it will not be able to locate the
source files. 'gcov' produces files called 'MANGLEDNAME.gcov' in the
current directory. These contain the coverage information of the source
file they correspond to. One '.gcov' file is produced for each source
file containing code, which was compiled to produce the data files. The
MANGLEDNAME part of the output file name is usually simply the source
file name, but can be something more complicated if the '-l' or '-p'
options are given. Refer to those options for details.
The '.gcov' files contain the ':' separated fields along with program
source code. The format is
EXECUTION_COUNT:LINE_NUMBER:SOURCE LINE TEXT
Additional block information may succeed each line, when requested by
command line option. The EXECUTION_COUNT is '-' for lines containing no
code and '#####' for lines which were never executed. Some lines of
information at the start have LINE_NUMBER of zero.
The preamble lines are of the form
-:0:TAG:VALUE
The ordering and number of these preamble lines will be augmented as
'gcov' development progresses -- do not rely on them remaining
unchanged. Use TAG to locate a particular preamble line.
The additional block information is of the form
TAG INFORMATION
The INFORMATION is human readable, but designed to be simple enough for
machine parsing too.
When printing percentages, 0% and 100% are only printed when the values
are _exactly_ 0% and 100% respectively. Other values which would
conventionally be rounded to 0% or 100% are instead printed as the
nearest non-boundary value.
When using 'gcov', you must first compile your program with two special
GCC options: '-fprofile-arcs -ftest-coverage'. This tells the compiler
to generate additional information needed by gcov (basically a flow
graph of the program) and also includes additional code in the object
files for generating the extra profiling information needed by gcov.
These additional files are placed in the directory where the object file
is located.
Running the program will cause profile output to be generated. For
each source file compiled with '-fprofile-arcs', an accompanying '.gcda'
file will be placed in the object file directory.
Running 'gcov' with your program's source file names as arguments will
now produce a listing of the code along with frequency of execution for
each line. For example, if your program is called 'tmp.c', this is what
you see when you use the basic 'gcov' facility:
$ gcc -fprofile-arcs -ftest-coverage tmp.c
$ a.out
$ gcov tmp.c
90.00% of 10 source lines executed in file tmp.c
Creating tmp.c.gcov.
The file 'tmp.c.gcov' contains output from 'gcov'. Here is a sample:
-: 0:Source:tmp.c
-: 0:Graph:tmp.gcno
-: 0:Data:tmp.gcda
-: 0:Runs:1
-: 0:Programs:1
-: 1:#include <stdio.h>
-: 2:
-: 3:int main (void)
1: 4:{
1: 5: int i, total;
-: 6:
1: 7: total = 0;
-: 8:
11: 9: for (i = 0; i < 10; i++)
10: 10: total += i;
-: 11:
1: 12: if (total != 45)
#####: 13: printf ("Failure\n");
-: 14: else
1: 15: printf ("Success\n");
1: 16: return 0;
-: 17:}
When you use the '-a' option, you will get individual block counts, and
the output looks like this:
-: 0:Source:tmp.c
-: 0:Graph:tmp.gcno
-: 0:Data:tmp.gcda
-: 0:Runs:1
-: 0:Programs:1
-: 1:#include <stdio.h>
-: 2:
-: 3:int main (void)
1: 4:{
1: 4-block 0
1: 5: int i, total;
-: 6:
1: 7: total = 0;
-: 8:
11: 9: for (i = 0; i < 10; i++)
11: 9-block 0
10: 10: total += i;
10: 10-block 0
-: 11:
1: 12: if (total != 45)
1: 12-block 0
#####: 13: printf ("Failure\n");
$$$$$: 13-block 0
-: 14: else
1: 15: printf ("Success\n");
1: 15-block 0
1: 16: return 0;
1: 16-block 0
-: 17:}
In this mode, each basic block is only shown on one line - the last
line of the block. A multi-line block will only contribute to the
execution count of that last line, and other lines will not be shown to
contain code, unless previous blocks end on those lines. The total
execution count of a line is shown and subsequent lines show the
execution counts for individual blocks that end on that line. After
each block, the branch and call counts of the block will be shown, if
the '-b' option is given.
Because of the way GCC instruments calls, a call count can be shown
after a line with no individual blocks. As you can see, line 13
contains a basic block that was not executed.
When you use the '-b' option, your output looks like this:
$ gcov -b tmp.c
90.00% of 10 source lines executed in file tmp.c
80.00% of 5 branches executed in file tmp.c
80.00% of 5 branches taken at least once in file tmp.c
50.00% of 2 calls executed in file tmp.c
Creating tmp.c.gcov.
Here is a sample of a resulting 'tmp.c.gcov' file:
-: 0:Source:tmp.c
-: 0:Graph:tmp.gcno
-: 0:Data:tmp.gcda
-: 0:Runs:1
-: 0:Programs:1
-: 1:#include <stdio.h>
-: 2:
-: 3:int main (void)
function main called 1 returned 1 blocks executed 75%
1: 4:{
1: 5: int i, total;
-: 6:
1: 7: total = 0;
-: 8:
11: 9: for (i = 0; i < 10; i++)
branch 0 taken 91% (fallthrough)
branch 1 taken 9%
10: 10: total += i;
-: 11:
1: 12: if (total != 45)
branch 0 taken 0% (fallthrough)
branch 1 taken 100%
#####: 13: printf ("Failure\n");
call 0 never executed
-: 14: else
1: 15: printf ("Success\n");
call 0 called 1 returned 100%
1: 16: return 0;
-: 17:}
For each function, a line is printed showing how many times the
function is called, how many times it returns and what percentage of the
function's blocks were executed.
For each basic block, a line is printed after the last line of the
basic block describing the branch or call that ends the basic block.
There can be multiple branches and calls listed for a single source line
if there are multiple basic blocks that end on that line. In this case,
the branches and calls are each given a number. There is no simple way
to map these branches and calls back to source constructs. In general,
though, the lowest numbered branch or call will correspond to the
leftmost construct on the source line.
For a branch, if it was executed at least once, then a percentage
indicating the number of times the branch was taken divided by the
number of times the branch was executed will be printed. Otherwise, the
message "never executed" is printed.
For a call, if it was executed at least once, then a percentage
indicating the number of times the call returned divided by the number
of times the call was executed will be printed. This will usually be
100%, but may be less for functions that call 'exit' or 'longjmp', and
thus may not return every time they are called.
The execution counts are cumulative. If the example program were
executed again without removing the '.gcda' file, the count for the
number of times each line in the source was executed would be added to
the results of the previous run(s). This is potentially useful in
several ways. For example, it could be used to accumulate data over a
number of program runs as part of a test verification suite, or to
provide more accurate long-term information over a large number of
program runs.
The data in the '.gcda' files is saved immediately before the program
exits. For each source file compiled with '-fprofile-arcs', the
profiling code first attempts to read in an existing '.gcda' file; if
the file doesn't match the executable (differing number of basic block
counts) it will ignore the contents of the file. It then adds in the
new execution counts and finally writes the data to the file.

File: gcc.info, Node: Gcov and Optimization, Next: Gcov Data Files, Prev: Invoking Gcov, Up: Gcov
9.3 Using 'gcov' with GCC Optimization
======================================
If you plan to use 'gcov' to help optimize your code, you must first
compile your program with two special GCC options: '-fprofile-arcs
-ftest-coverage'. Aside from that, you can use any other GCC options;
but if you want to prove that every single line in your program was
executed, you should not compile with optimization at the same time. On
some machines the optimizer can eliminate some simple code lines by
combining them with other lines. For example, code like this:
if (a != b)
c = 1;
else
c = 0;
can be compiled into one instruction on some machines. In this case,
there is no way for 'gcov' to calculate separate execution counts for
each line because there isn't separate code for each line. Hence the
'gcov' output looks like this if you compiled the program with
optimization:
100: 12:if (a != b)
100: 13: c = 1;
100: 14:else
100: 15: c = 0;
The output shows that this block of code, combined by optimization,
executed 100 times. In one sense this result is correct, because there
was only one instruction representing all four of these lines. However,
the output does not indicate how many times the result was 0 and how
many times the result was 1.
Inlineable functions can create unexpected line counts. Line counts
are shown for the source code of the inlineable function, but what is
shown depends on where the function is inlined, or if it is not inlined
at all.
If the function is not inlined, the compiler must emit an out of line
copy of the function, in any object file that needs it. If 'fileA.o'
and 'fileB.o' both contain out of line bodies of a particular inlineable
function, they will also both contain coverage counts for that function.
When 'fileA.o' and 'fileB.o' are linked together, the linker will, on
many systems, select one of those out of line bodies for all calls to
that function, and remove or ignore the other. Unfortunately, it will
not remove the coverage counters for the unused function body. Hence
when instrumented, all but one use of that function will show zero
counts.
If the function is inlined in several places, the block structure in
each location might not be the same. For instance, a condition might
now be calculable at compile time in some instances. Because the
coverage of all the uses of the inline function will be shown for the
same source lines, the line counts themselves might seem inconsistent.

File: gcc.info, Node: Gcov Data Files, Next: Cross-profiling, Prev: Gcov and Optimization, Up: Gcov
9.4 Brief description of 'gcov' data files
==========================================
'gcov' uses two files for profiling. The names of these files are
derived from the original _object_ file by substituting the file suffix
with either '.gcno', or '.gcda'. All of these files are placed in the
same directory as the object file, and contain data stored in a
platform-independent format.
The '.gcno' file is generated when the source file is compiled with the
GCC '-ftest-coverage' option. It contains information to reconstruct
the basic block graphs and assign source line numbers to blocks.
The '.gcda' file is generated when a program containing object files
built with the GCC '-fprofile-arcs' option is executed. A separate
'.gcda' file is created for each object file compiled with this option.
It contains arc transition counts, and some summary information.
The full details of the file format is specified in 'gcov-io.h', and
functions provided in that header file should be used to access the
coverage files.

File: gcc.info, Node: Cross-profiling, Prev: Gcov Data Files, Up: Gcov
9.5 Data file relocation to support cross-profiling
===================================================
Running the program will cause profile output to be generated. For each
source file compiled with '-fprofile-arcs', an accompanying '.gcda' file
will be placed in the object file directory. That implicitly requires
running the program on the same system as it was built or having the
same absolute directory structure on the target system. The program
will try to create the needed directory structure, if it is not already
present.
To support cross-profiling, a program compiled with '-fprofile-arcs'
can relocate the data files based on two environment variables:
* GCOV_PREFIX contains the prefix to add to the absolute paths in the
object file. Prefix must be absolute as well, otherwise its value
is ignored. The default is no prefix.
* GCOV_PREFIX_STRIP indicates the how many initial directory names to
strip off the hardwired absolute paths. Default value is 0.
_Note:_ GCOV_PREFIX_STRIP has no effect if GCOV_PREFIX is
undefined, empty or non-absolute.
For example, if the object file '/user/build/foo.o' was built with
'-fprofile-arcs', the final executable will try to create the data file
'/user/build/foo.gcda' when running on the target system. This will
fail if the corresponding directory does not exist and it is unable to
create it. This can be overcome by, for example, setting the
environment as 'GCOV_PREFIX=/target/run' and 'GCOV_PREFIX_STRIP=1'.
Such a setting will name the data file '/target/run/build/foo.gcda'.
You must move the data files to the expected directory tree in order to
use them for profile directed optimizations ('--use-profile'), or to use
the 'gcov' tool.

File: gcc.info, Node: Trouble, Next: Bugs, Prev: Gcov, Up: Top
10 Known Causes of Trouble with GCC
***********************************
This section describes known problems that affect users of GCC. Most of
these are not GCC bugs per se--if they were, we would fix them. But the
result for a user may be like the result of a bug.
Some of these problems are due to bugs in other software, some are
missing features that are too much work to add, and some are places
where people's opinions differ as to what is best.
* Menu:
* Actual Bugs:: Bugs we will fix later.
* Cross-Compiler Problems:: Common problems of cross compiling with GCC.
* Interoperation:: Problems using GCC with other compilers,
and with certain linkers, assemblers and debuggers.
* Incompatibilities:: GCC is incompatible with traditional C.
* Fixed Headers:: GCC uses corrected versions of system header files.
This is necessary, but doesn't always work smoothly.
* Standard Libraries:: GCC uses the system C library, which might not be
compliant with the ISO C standard.
* Disappointments:: Regrettable things we can't change, but not quite bugs.
* C++ Misunderstandings:: Common misunderstandings with GNU C++.
* Protoize Caveats:: Things to watch out for when using 'protoize'.
* Non-bugs:: Things we think are right, but some others disagree.
* Warnings and Errors:: Which problems in your code get warnings,
and which get errors.

File: gcc.info, Node: Actual Bugs, Next: Cross-Compiler Problems, Up: Trouble
10.1 Actual Bugs We Haven't Fixed Yet
=====================================
* The 'fixincludes' script interacts badly with automounters; if the
directory of system header files is automounted, it tends to be
unmounted while 'fixincludes' is running. This would seem to be a
bug in the automounter. We don't know any good way to work around
it.
* The 'fixproto' script will sometimes add prototypes for the
'sigsetjmp' and 'siglongjmp' functions that reference the 'jmp_buf'
type before that type is defined. To work around this, edit the
offending file and place the typedef in front of the prototypes.

File: gcc.info, Node: Cross-Compiler Problems, Next: Interoperation, Prev: Actual Bugs, Up: Trouble
10.2 Cross-Compiler Problems
============================
You may run into problems with cross compilation on certain machines,
for several reasons.
* At present, the program 'mips-tfile' which adds debug support to
object files on MIPS systems does not work in a cross compile
environment.

File: gcc.info, Node: Interoperation, Next: Incompatibilities, Prev: Cross-Compiler Problems, Up: Trouble
10.3 Interoperation
===================
This section lists various difficulties encountered in using GCC
together with other compilers or with the assemblers, linkers, libraries
and debuggers on certain systems.
* On many platforms, GCC supports a different ABI for C++ than do
other compilers, so the object files compiled by GCC cannot be used
with object files generated by another C++ compiler.
An area where the difference is most apparent is name mangling.
The use of different name mangling is intentional, to protect you
from more subtle problems. Compilers differ as to many internal
details of C++ implementation, including: how class instances are
laid out, how multiple inheritance is implemented, and how virtual
function calls are handled. If the name encoding were made the
same, your programs would link against libraries provided from
other compilers--but the programs would then crash when run.
Incompatible libraries are then detected at link time, rather than
at run time.
* On some BSD systems, including some versions of Ultrix, use of
profiling causes static variable destructors (currently used only
in C++) not to be run.
* On some SGI systems, when you use '-lgl_s' as an option, it gets
translated magically to '-lgl_s -lX11_s -lc_s'. Naturally, this
does not happen when you use GCC. You must specify all three
options explicitly.
* On a SPARC, GCC aligns all values of type 'double' on an 8-byte
boundary, and it expects every 'double' to be so aligned. The Sun
compiler usually gives 'double' values 8-byte alignment, with one
exception: function arguments of type 'double' may not be aligned.
As a result, if a function compiled with Sun CC takes the address
of an argument of type 'double' and passes this pointer of type
'double *' to a function compiled with GCC, dereferencing the
pointer may cause a fatal signal.
One way to solve this problem is to compile your entire program
with GCC. Another solution is to modify the function that is
compiled with Sun CC to copy the argument into a local variable;
local variables are always properly aligned. A third solution is
to modify the function that uses the pointer to dereference it via
the following function 'access_double' instead of directly with
'*':
inline double
access_double (double *unaligned_ptr)
{
union d2i { double d; int i[2]; };
union d2i *p = (union d2i *) unaligned_ptr;
union d2i u;
u.i[0] = p->i[0];
u.i[1] = p->i[1];
return u.d;
}
Storing into the pointer can be done likewise with the same union.
* On Solaris, the 'malloc' function in the 'libmalloc.a' library may
allocate memory that is only 4 byte aligned. Since GCC on the
SPARC assumes that doubles are 8 byte aligned, this may result in a
fatal signal if doubles are stored in memory allocated by the
'libmalloc.a' library.
The solution is to not use the 'libmalloc.a' library. Use instead
'malloc' and related functions from 'libc.a'; they do not have this
problem.
* On the HP PA machine, ADB sometimes fails to work on functions
compiled with GCC. Specifically, it fails to work on functions
that use 'alloca' or variable-size arrays. This is because GCC
doesn't generate HP-UX unwind descriptors for such functions. It
may even be impossible to generate them.
* Debugging ('-g') is not supported on the HP PA machine, unless you
use the preliminary GNU tools.
* Taking the address of a label may generate errors from the HP-UX PA
assembler. GAS for the PA does not have this problem.
* Using floating point parameters for indirect calls to static
functions will not work when using the HP assembler. There simply
is no way for GCC to specify what registers hold arguments for
static functions when using the HP assembler. GAS for the PA does
not have this problem.
* In extremely rare cases involving some very large functions you may
receive errors from the HP linker complaining about an out of
bounds unconditional branch offset. This used to occur more often
in previous versions of GCC, but is now exceptionally rare. If you
should run into it, you can work around by making your function
smaller.
* GCC compiled code sometimes emits warnings from the HP-UX assembler
of the form:
(warning) Use of GR3 when
frame >= 8192 may cause conflict.
These warnings are harmless and can be safely ignored.
* In extremely rare cases involving some very large functions you may
receive errors from the AIX Assembler complaining about a
displacement that is too large. If you should run into it, you can
work around by making your function smaller.
* The 'libstdc++.a' library in GCC relies on the SVR4 dynamic linker
semantics which merges global symbols between libraries and
applications, especially necessary for C++ streams functionality.
This is not the default behavior of AIX shared libraries and
dynamic linking. 'libstdc++.a' is built on AIX with
"runtime-linking" enabled so that symbol merging can occur. To
utilize this feature, the application linked with 'libstdc++.a'
must include the '-Wl,-brtl' flag on the link line. G++ cannot
impose this because this option may interfere with the semantics of
the user program and users may not always use 'g++' to link his or
her application. Applications are not required to use the
'-Wl,-brtl' flag on the link line--the rest of the 'libstdc++.a'
library which is not dependent on the symbol merging semantics will
continue to function correctly.
* An application can interpose its own definition of functions for
functions invoked by 'libstdc++.a' with "runtime-linking" enabled
on AIX. To accomplish this the application must be linked with
"runtime-linking" option and the functions explicitly must be
exported by the application ('-Wl,-brtl,-bE:exportfile').
* AIX on the RS/6000 provides support (NLS) for environments outside
of the United States. Compilers and assemblers use NLS to support
locale-specific representations of various objects including
floating-point numbers ('.' vs ',' for separating decimal
fractions). There have been problems reported where the library
linked with GCC does not produce the same floating-point formats
that the assembler accepts. If you have this problem, set the
'LANG' environment variable to 'C' or 'En_US'.
* Even if you specify '-fdollars-in-identifiers', you cannot
successfully use '$' in identifiers on the RS/6000 due to a
restriction in the IBM assembler. GAS supports these identifiers.

File: gcc.info, Node: Incompatibilities, Next: Fixed Headers, Prev: Interoperation, Up: Trouble
10.4 Incompatibilities of GCC
=============================
There are several noteworthy incompatibilities between GNU C and K&R
(non-ISO) versions of C.
* GCC normally makes string constants read-only. If several
identical-looking string constants are used, GCC stores only one
copy of the string.
One consequence is that you cannot call 'mktemp' with a string
constant argument. The function 'mktemp' always alters the string
its argument points to.
Another consequence is that 'sscanf' does not work on some very old
systems when passed a string constant as its format control string
or input. This is because 'sscanf' incorrectly tries to write into
the string constant. Likewise 'fscanf' and 'scanf'.
The solution to these problems is to change the program to use
'char'-array variables with initialization strings for these
purposes instead of string constants.
* '-2147483648' is positive.
This is because 2147483648 cannot fit in the type 'int', so
(following the ISO C rules) its data type is 'unsigned long int'.
Negating this value yields 2147483648 again.
* GCC does not substitute macro arguments when they appear inside of
string constants. For example, the following macro in GCC
#define foo(a) "a"
will produce output '"a"' regardless of what the argument A is.
* When you use 'setjmp' and 'longjmp', the only automatic variables
guaranteed to remain valid are those declared 'volatile'. This is
a consequence of automatic register allocation. Consider this
function:
jmp_buf j;
foo ()
{
int a, b;
a = fun1 ();
if (setjmp (j))
return a;
a = fun2 ();
/* 'longjmp (j)' may occur in 'fun3'. */
return a + fun3 ();
}
Here 'a' may or may not be restored to its first value when the
'longjmp' occurs. If 'a' is allocated in a register, then its
first value is restored; otherwise, it keeps the last value stored
in it.
If you use the '-W' option with the '-O' option, you will get a
warning when GCC thinks such a problem might be possible.
* Programs that use preprocessing directives in the middle of macro
arguments do not work with GCC. For example, a program like this
will not work:
foobar (
#define luser
hack)
ISO C does not permit such a construct.
* K&R compilers allow comments to cross over an inclusion boundary
(i.e. started in an include file and ended in the including file).
* Declarations of external variables and functions within a block
apply only to the block containing the declaration. In other
words, they have the same scope as any other declaration in the
same place.
In some other C compilers, a 'extern' declaration affects all the
rest of the file even if it happens within a block.
* In traditional C, you can combine 'long', etc., with a typedef
name, as shown here:
typedef int foo;
typedef long foo bar;
In ISO C, this is not allowed: 'long' and other type modifiers
require an explicit 'int'.
* PCC allows typedef names to be used as function parameters.
* Traditional C allows the following erroneous pair of declarations
to appear together in a given scope:
typedef int foo;
typedef foo foo;
* GCC treats all characters of identifiers as significant. According
to K&R-1 (2.2), "No more than the first eight characters are
significant, although more may be used.". Also according to K&R-1
(2.2), "An identifier is a sequence of letters and digits; the
first character must be a letter. The underscore _ counts as a
letter.", but GCC also allows dollar signs in identifiers.
* PCC allows whitespace in the middle of compound assignment
operators such as '+='. GCC, following the ISO standard, does not
allow this.
* GCC complains about unterminated character constants inside of
preprocessing conditionals that fail. Some programs have English
comments enclosed in conditionals that are guaranteed to fail; if
these comments contain apostrophes, GCC will probably report an
error. For example, this code would produce an error:
#if 0
You can't expect this to work.
#endif
The best solution to such a problem is to put the text into an
actual C comment delimited by '/*...*/'.
* Many user programs contain the declaration 'long time ();'. In the
past, the system header files on many systems did not actually
declare 'time', so it did not matter what type your program
declared it to return. But in systems with ISO C headers, 'time'
is declared to return 'time_t', and if that is not the same as
'long', then 'long time ();' is erroneous.
The solution is to change your program to use appropriate system
headers ('<time.h>' on systems with ISO C headers) and not to
declare 'time' if the system header files declare it, or failing
that to use 'time_t' as the return type of 'time'.
* When compiling functions that return 'float', PCC converts it to a
double. GCC actually returns a 'float'. If you are concerned with
PCC compatibility, you should declare your functions to return
'double'; you might as well say what you mean.
* When compiling functions that return structures or unions, GCC
output code normally uses a method different from that used on most
versions of Unix. As a result, code compiled with GCC cannot call
a structure-returning function compiled with PCC, and vice versa.
The method used by GCC is as follows: a structure or union which is
1, 2, 4 or 8 bytes long is returned like a scalar. A structure or
union with any other size is stored into an address supplied by the
caller (usually in a special, fixed register, but on some machines
it is passed on the stack). The target hook
'TARGET_STRUCT_VALUE_RTX' tells GCC where to pass this address.
By contrast, PCC on most target machines returns structures and
unions of any size by copying the data into an area of static
storage, and then returning the address of that storage as if it
were a pointer value. The caller must copy the data from that
memory area to the place where the value is wanted. GCC does not
use this method because it is slower and nonreentrant.
On some newer machines, PCC uses a reentrant convention for all
structure and union returning. GCC on most of these machines uses
a compatible convention when returning structures and unions in
memory, but still returns small structures and unions in registers.
You can tell GCC to use a compatible convention for all structure
and union returning with the option '-fpcc-struct-return'.
* GCC complains about program fragments such as '0x74ae-0x4000' which
appear to be two hexadecimal constants separated by the minus
operator. Actually, this string is a single "preprocessing token".
Each such token must correspond to one token in C. Since this does
not, GCC prints an error message. Although it may appear obvious
that what is meant is an operator and two values, the ISO C
standard specifically requires that this be treated as erroneous.
A "preprocessing token" is a "preprocessing number" if it begins
with a digit and is followed by letters, underscores, digits,
periods and 'e+', 'e-', 'E+', 'E-', 'p+', 'p-', 'P+', or 'P-'
character sequences. (In strict C89 mode, the sequences 'p+',
'p-', 'P+' and 'P-' cannot appear in preprocessing numbers.)
To make the above program fragment valid, place whitespace in front
of the minus sign. This whitespace will end the preprocessing
number.

File: gcc.info, Node: Fixed Headers, Next: Standard Libraries, Prev: Incompatibilities, Up: Trouble
10.5 Fixed Header Files
=======================
GCC needs to install corrected versions of some system header files.
This is because most target systems have some header files that won't
work with GCC unless they are changed. Some have bugs, some are
incompatible with ISO C, and some depend on special features of other
compilers.
Installing GCC automatically creates and installs the fixed header
files, by running a program called 'fixincludes'. Normally, you don't
need to pay attention to this. But there are cases where it doesn't do
the right thing automatically.
* If you update the system's header files, such as by installing a
new system version, the fixed header files of GCC are not
automatically updated. They can be updated using the 'mkheaders'
script installed in 'LIBEXECDIR/gcc/TARGET/VERSION/install-tools/'.
* On some systems, header file directories contain machine-specific
symbolic links in certain places. This makes it possible to share
most of the header files among hosts running the same version of
the system on different machine models.
The programs that fix the header files do not understand this
special way of using symbolic links; therefore, the directory of
fixed header files is good only for the machine model used to build
it.
It is possible to make separate sets of fixed header files for the
different machine models, and arrange a structure of symbolic links
so as to use the proper set, but you'll have to do this by hand.

File: gcc.info, Node: Standard Libraries, Next: Disappointments, Prev: Fixed Headers, Up: Trouble
10.6 Standard Libraries
=======================
GCC by itself attempts to be a conforming freestanding implementation.
*Note Language Standards Supported by GCC: Standards, for details of
what this means. Beyond the library facilities required of such an
implementation, the rest of the C library is supplied by the vendor of
the operating system. If that C library doesn't conform to the C
standards, then your programs might get warnings (especially when using
'-Wall') that you don't expect.
For example, the 'sprintf' function on SunOS 4.1.3 returns 'char *'
while the C standard says that 'sprintf' returns an 'int'. The
'fixincludes' program could make the prototype for this function match
the Standard, but that would be wrong, since the function will still
return 'char *'.
If you need a Standard compliant library, then you need to find one, as
GCC does not provide one. The GNU C library (called 'glibc') provides
ISO C, POSIX, BSD, SystemV and X/Open compatibility for GNU/Linux and
HURD-based GNU systems; no recent version of it supports other systems,
though some very old versions did. Version 2.2 of the GNU C library
includes nearly complete C99 support. You could also ask your operating
system vendor if newer libraries are available.

File: gcc.info, Node: Disappointments, Next: C++ Misunderstandings, Prev: Standard Libraries, Up: Trouble
10.7 Disappointments and Misunderstandings
==========================================
These problems are perhaps regrettable, but we don't know any practical
way around them.
* Certain local variables aren't recognized by debuggers when you
compile with optimization.
This occurs because sometimes GCC optimizes the variable out of
existence. There is no way to tell the debugger how to compute the
value such a variable "would have had", and it is not clear that
would be desirable anyway. So GCC simply does not mention the
eliminated variable when it writes debugging information.
You have to expect a certain amount of disagreement between the
executable and your source code, when you use optimization.
* Users often think it is a bug when GCC reports an error for code
like this:
int foo (struct mumble *);
struct mumble { ... };
int foo (struct mumble *x)
{ ... }
This code really is erroneous, because the scope of 'struct mumble'
in the prototype is limited to the argument list containing it. It
does not refer to the 'struct mumble' defined with file scope
immediately below--they are two unrelated types with similar names
in different scopes.
But in the definition of 'foo', the file-scope type is used because
that is available to be inherited. Thus, the definition and the
prototype do not match, and you get an error.
This behavior may seem silly, but it's what the ISO standard
specifies. It is easy enough for you to make your code work by
moving the definition of 'struct mumble' above the prototype. It's
not worth being incompatible with ISO C just to avoid an error for
the example shown above.
* Accesses to bit-fields even in volatile objects works by accessing
larger objects, such as a byte or a word. You cannot rely on what
size of object is accessed in order to read or write the bit-field;
it may even vary for a given bit-field according to the precise
usage.
If you care about controlling the amount of memory that is
accessed, use volatile but do not use bit-fields.
* GCC comes with shell scripts to fix certain known problems in
system header files. They install corrected copies of various
header files in a special directory where only GCC will normally
look for them. The scripts adapt to various systems by searching
all the system header files for the problem cases that we know
about.
If new system header files are installed, nothing automatically
arranges to update the corrected header files. They can be updated
using the 'mkheaders' script installed in
'LIBEXECDIR/gcc/TARGET/VERSION/install-tools/'.
* On 68000 and x86 systems, for instance, you can get paradoxical
results if you test the precise values of floating point numbers.
For example, you can find that a floating point value which is not
a NaN is not equal to itself. This results from the fact that the
floating point registers hold a few more bits of precision than fit
in a 'double' in memory. Compiled code moves values between memory
and floating point registers at its convenience, and moving them
into memory truncates them.
You can partially avoid this problem by using the '-ffloat-store'
option (*note Optimize Options::).
* On AIX and other platforms without weak symbol support, templates
need to be instantiated explicitly and symbols for static members
of templates will not be generated.
* On AIX, GCC scans object files and library archives for static
constructors and destructors when linking an application before the
linker prunes unreferenced symbols. This is necessary to prevent
the AIX linker from mistakenly assuming that static constructor or
destructor are unused and removing them before the scanning can
occur. All static constructors and destructors found will be
referenced even though the modules in which they occur may not be
used by the program. This may lead to both increased executable
size and unexpected symbol references.

File: gcc.info, Node: C++ Misunderstandings, Next: Protoize Caveats, Prev: Disappointments, Up: Trouble
10.8 Common Misunderstandings with GNU C++
==========================================
C++ is a complex language and an evolving one, and its standard
definition (the ISO C++ standard) was only recently completed. As a
result, your C++ compiler may occasionally surprise you, even when its
behavior is correct. This section discusses some areas that frequently
give rise to questions of this sort.
* Menu:
* Static Definitions:: Static member declarations are not definitions
* Name lookup:: Name lookup, templates, and accessing members of base classes
* Temporaries:: Temporaries may vanish before you expect
* Copy Assignment:: Copy Assignment operators copy virtual bases twice

File: gcc.info, Node: Static Definitions, Next: Name lookup, Up: C++ Misunderstandings
10.8.1 Declare _and_ Define Static Members
------------------------------------------
When a class has static data members, it is not enough to _declare_ the
static member; you must also _define_ it. For example:
class Foo
{
...
void method();
static int bar;
};
This declaration only establishes that the class 'Foo' has an 'int'
named 'Foo::bar', and a member function named 'Foo::method'. But you
still need to define _both_ 'method' and 'bar' elsewhere. According to
the ISO standard, you must supply an initializer in one (and only one)
source file, such as:
int Foo::bar = 0;
Other C++ compilers may not correctly implement the standard behavior.
As a result, when you switch to 'g++' from one of these compilers, you
may discover that a program that appeared to work correctly in fact does
not conform to the standard: 'g++' reports as undefined symbols any
static data members that lack definitions.

File: gcc.info, Node: Name lookup, Next: Temporaries, Prev: Static Definitions, Up: C++ Misunderstandings
10.8.2 Name lookup, templates, and accessing members of base classes
--------------------------------------------------------------------
The C++ standard prescribes that all names that are not dependent on
template parameters are bound to their present definitions when parsing
a template function or class.(1) Only names that are dependent are
looked up at the point of instantiation. For example, consider
void foo(double);
struct A {
template <typename T>
void f () {
foo (1); // 1
int i = N; // 2
T t;
t.bar(); // 3
foo (t); // 4
}
static const int N;
};
Here, the names 'foo' and 'N' appear in a context that does not depend
on the type of 'T'. The compiler will thus require that they are
defined in the context of use in the template, not only before the point
of instantiation, and will here use '::foo(double)' and 'A::N',
respectively. In particular, it will convert the integer value to a
'double' when passing it to '::foo(double)'.
Conversely, 'bar' and the call to 'foo' in the fourth marked line are
used in contexts that do depend on the type of 'T', so they are only
looked up at the point of instantiation, and you can provide
declarations for them after declaring the template, but before
instantiating it. In particular, if you instantiate 'A::f<int>', the
last line will call an overloaded '::foo(int)' if one was provided, even
if after the declaration of 'struct A'.
This distinction between lookup of dependent and non-dependent names is
called two-stage (or dependent) name lookup. G++ implements it since
version 3.4.
Two-stage name lookup sometimes leads to situations with behavior
different from non-template codes. The most common is probably this:
template <typename T> struct Base {
int i;
};
template <typename T> struct Derived : public Base<T> {
int get_i() { return i; }
};
In 'get_i()', 'i' is not used in a dependent context, so the compiler
will look for a name declared at the enclosing namespace scope (which is
the global scope here). It will not look into the base class, since
that is dependent and you may declare specializations of 'Base' even
after declaring 'Derived', so the compiler can't really know what 'i'
would refer to. If there is no global variable 'i', then you will get
an error message.
In order to make it clear that you want the member of the base class,
you need to defer lookup until instantiation time, at which the base
class is known. For this, you need to access 'i' in a dependent
context, by either using 'this->i' (remember that 'this' is of type
'Derived<T>*', so is obviously dependent), or using 'Base<T>::i'.
Alternatively, 'Base<T>::i' might be brought into scope by a
'using'-declaration.
Another, similar example involves calling member functions of a base
class:
template <typename T> struct Base {
int f();
};
template <typename T> struct Derived : Base<T> {
int g() { return f(); };
};
Again, the call to 'f()' is not dependent on template arguments (there
are no arguments that depend on the type 'T', and it is also not
otherwise specified that the call should be in a dependent context).
Thus a global declaration of such a function must be available, since
the one in the base class is not visible until instantiation time. The
compiler will consequently produce the following error message:
x.cc: In member function `int Derived<T>::g()':
x.cc:6: error: there are no arguments to `f' that depend on a template
parameter, so a declaration of `f' must be available
x.cc:6: error: (if you use `-fpermissive', G++ will accept your code, but
allowing the use of an undeclared name is deprecated)
To make the code valid either use 'this->f()', or 'Base<T>::f()'.
Using the '-fpermissive' flag will also let the compiler accept the
code, by marking all function calls for which no declaration is visible
at the time of definition of the template for later lookup at
instantiation time, as if it were a dependent call. We do not recommend
using '-fpermissive' to work around invalid code, and it will also only
catch cases where functions in base classes are called, not where
variables in base classes are used (as in the example above).
Note that some compilers (including G++ versions prior to 3.4) get
these examples wrong and accept above code without an error. Those
compilers do not implement two-stage name lookup correctly.
---------- Footnotes ----------
(1) The C++ standard just uses the term "dependent" for names that
depend on the type or value of template parameters. This shorter term
will also be used in the rest of this section.

File: gcc.info, Node: Temporaries, Next: Copy Assignment, Prev: Name lookup, Up: C++ Misunderstandings
10.8.3 Temporaries May Vanish Before You Expect
-----------------------------------------------
It is dangerous to use pointers or references to _portions_ of a
temporary object. The compiler may very well delete the object before
you expect it to, leaving a pointer to garbage. The most common place
where this problem crops up is in classes like string classes,
especially ones that define a conversion function to type 'char *' or
'const char *'--which is one reason why the standard 'string' class
requires you to call the 'c_str' member function. However, any class
that returns a pointer to some internal structure is potentially subject
to this problem.
For example, a program may use a function 'strfunc' that returns
'string' objects, and another function 'charfunc' that operates on
pointers to 'char':
string strfunc ();
void charfunc (const char *);
void
f ()
{
const char *p = strfunc().c_str();
...
charfunc (p);
...
charfunc (p);
}
In this situation, it may seem reasonable to save a pointer to the C
string returned by the 'c_str' member function and use that rather than
call 'c_str' repeatedly. However, the temporary string created by the
call to 'strfunc' is destroyed after 'p' is initialized, at which point
'p' is left pointing to freed memory.
Code like this may run successfully under some other compilers,
particularly obsolete cfront-based compilers that delete temporaries
along with normal local variables. However, the GNU C++ behavior is
standard-conforming, so if your program depends on late destruction of
temporaries it is not portable.
The safe way to write such code is to give the temporary a name, which
forces it to remain until the end of the scope of the name. For
example:
const string& tmp = strfunc ();
charfunc (tmp.c_str ());

File: gcc.info, Node: Copy Assignment, Prev: Temporaries, Up: C++ Misunderstandings
10.8.4 Implicit Copy-Assignment for Virtual Bases
-------------------------------------------------
When a base class is virtual, only one subobject of the base class
belongs to each full object. Also, the constructors and destructors are
invoked only once, and called from the most-derived class. However,
such objects behave unspecified when being assigned. For example:
struct Base{
char *name;
Base(char *n) : name(strdup(n)){}
Base& operator= (const Base& other){
free (name);
name = strdup (other.name);
}
};
struct A:virtual Base{
int val;
A():Base("A"){}
};
struct B:virtual Base{
int bval;
B():Base("B"){}
};
struct Derived:public A, public B{
Derived():Base("Derived"){}
};
void func(Derived &d1, Derived &d2)
{
d1 = d2;
}
The C++ standard specifies that 'Base::Base' is only called once when
constructing or copy-constructing a Derived object. It is unspecified
whether 'Base::operator=' is called more than once when the implicit
copy-assignment for Derived objects is invoked (as it is inside 'func'
in the example).
G++ implements the "intuitive" algorithm for copy-assignment: assign
all direct bases, then assign all members. In that algorithm, the
virtual base subobject can be encountered more than once. In the
example, copying proceeds in the following order: 'val', 'name' (via
'strdup'), 'bval', and 'name' again.
If application code relies on copy-assignment, a user-defined
copy-assignment operator removes any uncertainties. With such an
operator, the application can define whether and how the virtual base
subobject is assigned.

File: gcc.info, Node: Protoize Caveats, Next: Non-bugs, Prev: C++ Misunderstandings, Up: Trouble
10.9 Caveats of using 'protoize'
================================
The conversion programs 'protoize' and 'unprotoize' can sometimes change
a source file in a way that won't work unless you rearrange it.
* 'protoize' can insert references to a type name or type tag before
the definition, or in a file where they are not defined.
If this happens, compiler error messages should show you where the
new references are, so fixing the file by hand is straightforward.
* There are some C constructs which 'protoize' cannot figure out.
For example, it can't determine argument types for declaring a
pointer-to-function variable; this you must do by hand. 'protoize'
inserts a comment containing '???' each time it finds such a
variable; so you can find all such variables by searching for this
string. ISO C does not require declaring the argument types of
pointer-to-function types.
* Using 'unprotoize' can easily introduce bugs. If the program
relied on prototypes to bring about conversion of arguments, these
conversions will not take place in the program without prototypes.
One case in which you can be sure 'unprotoize' is safe is when you
are removing prototypes that were made with 'protoize'; if the
program worked before without any prototypes, it will work again
without them.
You can find all the places where this problem might occur by
compiling the program with the '-Wtraditional-conversion' option.
It prints a warning whenever an argument is converted.
* Both conversion programs can be confused if there are macro calls
in and around the text to be converted. In other words, the
standard syntax for a declaration or definition must not result
from expanding a macro. This problem is inherent in the design of
C and cannot be fixed. If only a few functions have confusing
macro calls, you can easily convert them manually.
* 'protoize' cannot get the argument types for a function whose
definition was not actually compiled due to preprocessing
conditionals. When this happens, 'protoize' changes nothing in
regard to such a function. 'protoize' tries to detect such
instances and warn about them.
You can generally work around this problem by using 'protoize' step
by step, each time specifying a different set of '-D' options for
compilation, until all of the functions have been converted. There
is no automatic way to verify that you have got them all, however.
* Confusion may result if there is an occasion to convert a function
declaration or definition in a region of source code where there is
more than one formal parameter list present. Thus, attempts to
convert code containing multiple (conditionally compiled) versions
of a single function header (in the same vicinity) may not produce
the desired (or expected) results.
If you plan on converting source files which contain such code, it
is recommended that you first make sure that each conditionally
compiled region of source code which contains an alternative
function header also contains at least one additional follower
token (past the final right parenthesis of the function header).
This should circumvent the problem.
* 'unprotoize' can become confused when trying to convert a function
definition or declaration which contains a declaration for a
pointer-to-function formal argument which has the same name as the
function being defined or declared. We recommend you avoid such
choices of formal parameter names.
* You might also want to correct some of the indentation by hand and
break long lines. (The conversion programs don't write lines
longer than eighty characters in any case.)

File: gcc.info, Node: Non-bugs, Next: Warnings and Errors, Prev: Protoize Caveats, Up: Trouble
10.10 Certain Changes We Don't Want to Make
===========================================
This section lists changes that people frequently request, but which we
do not make because we think GCC is better without them.
* Checking the number and type of arguments to a function which has
an old-fashioned definition and no prototype.
Such a feature would work only occasionally--only for calls that
appear in the same file as the called function, following the
definition. The only way to check all calls reliably is to add a
prototype for the function. But adding a prototype eliminates the
motivation for this feature. So the feature is not worthwhile.
* Warning about using an expression whose type is signed as a shift
count.
Shift count operands are probably signed more often than unsigned.
Warning about this would cause far more annoyance than good.
* Warning about assigning a signed value to an unsigned variable.
Such assignments must be very common; warning about them would
cause more annoyance than good.
* Warning when a non-void function value is ignored.
C contains many standard functions that return a value that most
programs choose to ignore. One obvious example is 'printf'.
Warning about this practice only leads the defensive programmer to
clutter programs with dozens of casts to 'void'. Such casts are
required so frequently that they become visual noise. Writing
those casts becomes so automatic that they no longer convey useful
information about the intentions of the programmer. For functions
where the return value should never be ignored, use the
'warn_unused_result' function attribute (*note Function
Attributes::).
* Making '-fshort-enums' the default.
This would cause storage layout to be incompatible with most other
C compilers. And it doesn't seem very important, given that you
can get the same result in other ways. The case where it matters
most is when the enumeration-valued object is inside a structure,
and in that case you can specify a field width explicitly.
* Making bit-fields unsigned by default on particular machines where
"the ABI standard" says to do so.
The ISO C standard leaves it up to the implementation whether a
bit-field declared plain 'int' is signed or not. This in effect
creates two alternative dialects of C.
The GNU C compiler supports both dialects; you can specify the
signed dialect with '-fsigned-bitfields' and the unsigned dialect
with '-funsigned-bitfields'. However, this leaves open the
question of which dialect to use by default.
Currently, the preferred dialect makes plain bit-fields signed,
because this is simplest. Since 'int' is the same as 'signed int'
in every other context, it is cleanest for them to be the same in
bit-fields as well.
Some computer manufacturers have published Application Binary
Interface standards which specify that plain bit-fields should be
unsigned. It is a mistake, however, to say anything about this
issue in an ABI. This is because the handling of plain bit-fields
distinguishes two dialects of C. Both dialects are meaningful on
every type of machine. Whether a particular object file was
compiled using signed bit-fields or unsigned is of no concern to
other object files, even if they access the same bit-fields in the
same data structures.
A given program is written in one or the other of these two
dialects. The program stands a chance to work on most any machine
if it is compiled with the proper dialect. It is unlikely to work
at all if compiled with the wrong dialect.
Many users appreciate the GNU C compiler because it provides an
environment that is uniform across machines. These users would be
inconvenienced if the compiler treated plain bit-fields differently
on certain machines.
Occasionally users write programs intended only for a particular
machine type. On these occasions, the users would benefit if the
GNU C compiler were to support by default the same dialect as the
other compilers on that machine. But such applications are rare.
And users writing a program to run on more than one type of machine
cannot possibly benefit from this kind of compatibility.
This is why GCC does and will treat plain bit-fields in the same
fashion on all types of machines (by default).
There are some arguments for making bit-fields unsigned by default
on all machines. If, for example, this becomes a universal de
facto standard, it would make sense for GCC to go along with it.
This is something to be considered in the future.
(Of course, users strongly concerned about portability should
indicate explicitly in each bit-field whether it is signed or not.
In this way, they write programs which have the same meaning in
both C dialects.)
* Undefining '__STDC__' when '-ansi' is not used.
Currently, GCC defines '__STDC__' unconditionally. This provides
good results in practice.
Programmers normally use conditionals on '__STDC__' to ask whether
it is safe to use certain features of ISO C, such as function
prototypes or ISO token concatenation. Since plain 'gcc' supports
all the features of ISO C, the correct answer to these questions is
"yes".
Some users try to use '__STDC__' to check for the availability of
certain library facilities. This is actually incorrect usage in an
ISO C program, because the ISO C standard says that a conforming
freestanding implementation should define '__STDC__' even though it
does not have the library facilities. 'gcc -ansi -pedantic' is a
conforming freestanding implementation, and it is therefore
required to define '__STDC__', even though it does not come with an
ISO C library.
Sometimes people say that defining '__STDC__' in a compiler that
does not completely conform to the ISO C standard somehow violates
the standard. This is illogical. The standard is a standard for
compilers that claim to support ISO C, such as 'gcc -ansi'--not for
other compilers such as plain 'gcc'. Whatever the ISO C standard
says is relevant to the design of plain 'gcc' without '-ansi' only
for pragmatic reasons, not as a requirement.
GCC normally defines '__STDC__' to be 1, and in addition defines
'__STRICT_ANSI__' if you specify the '-ansi' option, or a '-std'
option for strict conformance to some version of ISO C. On some
hosts, system include files use a different convention, where
'__STDC__' is normally 0, but is 1 if the user specifies strict
conformance to the C Standard. GCC follows the host convention
when processing system include files, but when processing user
files it follows the usual GNU C convention.
* Undefining '__STDC__' in C++.
Programs written to compile with C++-to-C translators get the value
of '__STDC__' that goes with the C compiler that is subsequently
used. These programs must test '__STDC__' to determine what kind
of C preprocessor that compiler uses: whether they should
concatenate tokens in the ISO C fashion or in the traditional
fashion.
These programs work properly with GNU C++ if '__STDC__' is defined.
They would not work otherwise.
In addition, many header files are written to provide prototypes in
ISO C but not in traditional C. Many of these header files can
work without change in C++ provided '__STDC__' is defined. If
'__STDC__' is not defined, they will all fail, and will all need to
be changed to test explicitly for C++ as well.
* Deleting "empty" loops.
Historically, GCC has not deleted "empty" loops under the
assumption that the most likely reason you would put one in a
program is to have a delay, so deleting them will not make real
programs run any faster.
However, the rationale here is that optimization of a nonempty loop
cannot produce an empty one. This held for carefully written C
compiled with less powerful optimizers but is not always the case
for carefully written C++ or with more powerful optimizers. Thus
GCC will remove operations from loops whenever it can determine
those operations are not externally visible (apart from the time
taken to execute them, of course). In case the loop can be proved
to be finite, GCC will also remove the loop itself.
Be aware of this when performing timing tests, for instance the
following loop can be completely removed, provided
'some_expression' can provably not change any global state.
{
int sum = 0;
int ix;
for (ix = 0; ix != 10000; ix++)
sum += some_expression;
}
Even though 'sum' is accumulated in the loop, no use is made of
that summation, so the accumulation can be removed.
* Making side effects happen in the same order as in some other
compiler.
It is never safe to depend on the order of evaluation of side
effects. For example, a function call like this may very well
behave differently from one compiler to another:
void func (int, int);
int i = 2;
func (i++, i++);
There is no guarantee (in either the C or the C++ standard language
definitions) that the increments will be evaluated in any
particular order. Either increment might happen first. 'func'
might get the arguments '2, 3', or it might get '3, 2', or even '2,
2'.
* Making certain warnings into errors by default.
Some ISO C testsuites report failure when the compiler does not
produce an error message for a certain program.
ISO C requires a "diagnostic" message for certain kinds of invalid
programs, but a warning is defined by GCC to count as a diagnostic.
If GCC produces a warning but not an error, that is correct ISO C
support. If testsuites call this "failure", they should be run
with the GCC option '-pedantic-errors', which will turn these
warnings into errors.

File: gcc.info, Node: Warnings and Errors, Prev: Non-bugs, Up: Trouble
10.11 Warning Messages and Error Messages
=========================================
The GNU compiler can produce two kinds of diagnostics: errors and
warnings. Each kind has a different purpose:
"Errors" report problems that make it impossible to compile your
program. GCC reports errors with the source file name and line
number where the problem is apparent.
"Warnings" report other unusual conditions in your code that _may_
indicate a problem, although compilation can (and does) proceed.
Warning messages also report the source file name and line number,
but include the text 'warning:' to distinguish them from error
messages.
Warnings may indicate danger points where you should check to make sure
that your program really does what you intend; or the use of obsolete
features; or the use of nonstandard features of GNU C or C++. Many
warnings are issued only if you ask for them, with one of the '-W'
options (for instance, '-Wall' requests a variety of useful warnings).
GCC always tries to compile your program if possible; it never
gratuitously rejects a program whose meaning is clear merely because
(for instance) it fails to conform to a standard. In some cases,
however, the C and C++ standards specify that certain extensions are
forbidden, and a diagnostic _must_ be issued by a conforming compiler.
The '-pedantic' option tells GCC to issue warnings in such cases;
'-pedantic-errors' says to make them errors instead. This does not mean
that _all_ non-ISO constructs get warnings or errors.
*Note Options to Request or Suppress Warnings: Warning Options, for
more detail on these and related command-line options.

File: gcc.info, Node: Bugs, Next: Service, Prev: Trouble, Up: Top
11 Reporting Bugs
*****************
Your bug reports play an essential role in making GCC reliable.
When you encounter a problem, the first thing to do is to see if it is
already known. *Note Trouble::. If it isn't known, then you should
report the problem.
* Menu:
* Criteria: Bug Criteria. Have you really found a bug?
* Reporting: Bug Reporting. How to report a bug effectively.
* Known: Trouble. Known problems.
* Help: Service. Where to ask for help.

File: gcc.info, Node: Bug Criteria, Next: Bug Reporting, Up: Bugs
11.1 Have You Found a Bug?
==========================
If you are not sure whether you have found a bug, here are some
guidelines:
* If the compiler gets a fatal signal, for any input whatever, that
is a compiler bug. Reliable compilers never crash.
* If the compiler produces invalid assembly code, for any input
whatever (except an 'asm' statement), that is a compiler bug,
unless the compiler reports errors (not just warnings) which would
ordinarily prevent the assembler from being run.
* If the compiler produces valid assembly code that does not
correctly execute the input source code, that is a compiler bug.
However, you must double-check to make sure, because you may have a
program whose behavior is undefined, which happened by chance to
give the desired results with another C or C++ compiler.
For example, in many nonoptimizing compilers, you can write 'x;' at
the end of a function instead of 'return x;', with the same
results. But the value of the function is undefined if 'return' is
omitted; it is not a bug when GCC produces different results.
Problems often result from expressions with two increment
operators, as in 'f (*p++, *p++)'. Your previous compiler might
have interpreted that expression the way you intended; GCC might
interpret it another way. Neither compiler is wrong. The bug is
in your code.
After you have localized the error to a single source line, it
should be easy to check for these things. If your program is
correct and well defined, you have found a compiler bug.
* If the compiler produces an error message for valid input, that is
a compiler bug.
* If the compiler does not produce an error message for invalid
input, that is a compiler bug. However, you should note that your
idea of "invalid input" might be someone else's idea of "an
extension" or "support for traditional practice".
* If you are an experienced user of one of the languages GCC
supports, your suggestions for improvement of GCC are welcome in
any case.

File: gcc.info, Node: Bug Reporting, Prev: Bug Criteria, Up: Bugs
11.2 How and where to Report Bugs
=================================
Bugs should be reported to the bug database at
<http://gcc.gnu.org/bugs.html>.

File: gcc.info, Node: Service, Next: Contributing, Prev: Bugs, Up: Top
12 How To Get Help with GCC
***************************
If you need help installing, using or changing GCC, there are two ways
to find it:
* Send a message to a suitable network mailing list. First try
<gcc-help@gcc.gnu.org> (for help installing or using GCC), and if
that brings no response, try <gcc@gcc.gnu.org>. For help changing
GCC, ask <gcc@gcc.gnu.org>. If you think you have found a bug in
GCC, please report it following the instructions at *note Bug
Reporting::.
* Look in the service directory for someone who might help you for a
fee. The service directory is found at
<http://www.gnu.org/prep/service.html>.
For further information, see <http://gcc.gnu.org/faq.html#support>.

File: gcc.info, Node: Contributing, Next: Funding, Prev: Service, Up: Top
13 Contributing to GCC Development
**********************************
If you would like to help pretest GCC releases to assure they work well,
current development sources are available by SVN (see
<http://gcc.gnu.org/svn.html>). Source and binary snapshots are also
available for FTP; see <http://gcc.gnu.org/snapshots.html>.
If you would like to work on improvements to GCC, please read the
advice at these URLs:
<http://gcc.gnu.org/contribute.html>
<http://gcc.gnu.org/contributewhy.html>
for information on how to make useful contributions and avoid
duplication of effort. Suggested projects are listed at
<http://gcc.gnu.org/projects/>.

File: gcc.info, Node: Funding, Next: GNU Project, Prev: Contributing, Up: Top
Funding Free Software
*********************
If you want to have more free software a few years from now, it makes
sense for you to help encourage people to contribute funds for its
development. The most effective approach known is to encourage
commercial redistributors to donate.
Users of free software systems can boost the pace of development by
encouraging for-a-fee distributors to donate part of their selling price
to free software developers--the Free Software Foundation, and others.
The way to convince distributors to do this is to demand it and expect
it from them. So when you compare distributors, judge them partly by
how much they give to free software development. Show distributors they
must compete to be the one who gives the most.
To make this approach work, you must insist on numbers that you can
compare, such as, "We will donate ten dollars to the Frobnitz project
for each disk sold." Don't be satisfied with a vague promise, such as
"A portion of the profits are donated," since it doesn't give a basis
for comparison.
Even a precise fraction "of the profits from this disk" is not very
meaningful, since creative accounting and unrelated business decisions
can greatly alter what fraction of the sales price counts as profit. If
the price you pay is $50, ten percent of the profit is probably less
than a dollar; it might be a few cents, or nothing at all.
Some redistributors do development work themselves. This is useful
too; but to keep everyone honest, you need to inquire how much they do,
and what kind. Some kinds of development make much more long-term
difference than others. For example, maintaining a separate version of
a program contributes very little; maintaining the standard version of a
program for the whole community contributes much. Easy new ports
contribute little, since someone else would surely do them; difficult
ports such as adding a new CPU to the GNU Compiler Collection contribute
more; major new features or packages contribute the most.
By establishing the idea that supporting further development is "the
proper thing to do" when distributing free software for a fee, we can
assure a steady flow of resources into making more free software.
Copyright (C) 1994 Free Software Foundation, Inc.
Verbatim copying and redistribution of this section is permitted
without royalty; alteration is not permitted.

File: gcc.info, Node: GNU Project, Next: Copying, Prev: Funding, Up: Top
The GNU Project and GNU/Linux
*****************************
The GNU Project was launched in 1984 to develop a complete Unix-like
operating system which is free software: the GNU system. (GNU is a
recursive acronym for "GNU's Not Unix"; it is pronounced "guh-NEW".)
Variants of the GNU operating system, which use the kernel Linux, are
now widely used; though these systems are often referred to as "Linux",
they are more accurately called GNU/Linux systems.
For more information, see:
<http://www.gnu.org/>
<http://www.gnu.org/gnu/linux-and-gnu.html>

File: gcc.info, Node: Copying, Next: GNU Free Documentation License, Prev: GNU Project, Up: Top
GNU General Public License
**************************
Version 3, 29 June 2007
Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
Everyone is permitted to copy and distribute verbatim copies of this
license document, but changing it is not allowed.
Preamble
========
The GNU General Public License is a free, copyleft license for software
and other kinds of works.
The licenses for most software and other practical works are designed
to take away your freedom to share and change the works. By contrast,
the GNU General Public License is intended to guarantee your freedom to
share and change all versions of a program-to make sure it remains free
software for all its users. We, the Free Software Foundation, use the
GNU General Public License for most of our software; it applies also to
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your programs, too.
When we speak of free software, we are referring to freedom, not price.
Our General Public Licenses are designed to make sure that you have the
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To protect your rights, we need to prevent others from denying you
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For example, if you distribute copies of such a program, whether gratis
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Developers that use the GNU GPL protect your rights with two steps: (1)
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The precise terms and conditions for copying, distribution and
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TERMS AND CONDITIONS
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You are not required to accept this License in order to receive or
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You may not impose any further restrictions on the exercise of the
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A patent license is "discriminatory" if it does not include within
the scope of its coverage, prohibits the exercise of, or is
conditioned on the non-exercise of one or more of the rights that
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covered work if you are a party to an arrangement with a third
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Nothing in this License shall be construed as excluding or limiting
any implied license or other defenses to infringement that may
otherwise be available to you under applicable patent law.
12. No Surrender of Others' Freedom.
If conditions are imposed on you (whether by court order, agreement
or otherwise) that contradict the conditions of this License, they
do not excuse you from the conditions of this License. If you
cannot convey a covered work so as to satisfy simultaneously your
obligations under this License and any other pertinent obligations,
then as a consequence you may not convey it at all. For example,
if you agree to terms that obligate you to collect a royalty for
further conveying from those to whom you convey the Program, the
only way you could satisfy both those terms and this License would
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13. Use with the GNU Affero General Public License.
Notwithstanding any other provision of this License, you have
permission to link or combine any covered work with a work licensed
under version 3 of the GNU Affero General Public License into a
single combined work, and to convey the resulting work. The terms
of this License will continue to apply to the part which is the
covered work, but the special requirements of the GNU Affero
General Public License, section 13, concerning interaction through
a network will apply to the combination as such.
14. Revised Versions of this License.
The Free Software Foundation may publish revised and/or new
versions of the GNU General Public License from time to time. Such
new versions will be similar in spirit to the present version, but
may differ in detail to address new problems or concerns.
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Software Foundation. If the Program does not specify a version
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version ever published by the Free Software Foundation.
If the Program specifies that a proxy can decide which future
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authorizes you to choose that version for the Program.
Later license versions may give you additional or different
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later version.
15. Disclaimer of Warranty.
THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE
COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS"
WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.
SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL
NECESSARY SERVICING, REPAIR OR CORRECTION.
16. Limitation of Liability.
IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN
WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES
AND/OR CONVEYS THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR
DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR
CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE
THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA
BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF
THE POSSIBILITY OF SUCH DAMAGES.
17. Interpretation of Sections 15 and 16.
If the disclaimer of warranty and limitation of liability provided
above cannot be given local legal effect according to their terms,
reviewing courts shall apply local law that most closely
approximates an absolute waiver of all civil liability in
connection with the Program, unless a warranty or assumption of
liability accompanies a copy of the Program in return for a fee.
END OF TERMS AND CONDITIONS
===========================
How to Apply These Terms to Your New Programs
=============================================
If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these
terms.
To do so, attach the following notices to the program. It is safest to
attach them to the start of each source file to most effectively state
the exclusion of warranty; and each file should have at least the
"copyright" line and a pointer to where the full notice is found.
ONE LINE TO GIVE THE PROGRAM'S NAME AND A BRIEF IDEA OF WHAT IT DOES.
Copyright (C) YEAR NAME OF AUTHOR
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or (at
your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
Also add information on how to contact you by electronic and paper
mail.
If the program does terminal interaction, make it output a short notice
like this when it starts in an interactive mode:
PROGRAM Copyright (C) YEAR NAME OF AUTHOR
This program comes with ABSOLUTELY NO WARRANTY; for details type 'show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type 'show c' for details.
The hypothetical commands 'show w' and 'show c' should show the
appropriate parts of the General Public License. Of course, your
program's commands might be different; for a GUI interface, you would
use an "about box".
You should also get your employer (if you work as a programmer) or
school, if any, to sign a "copyright disclaimer" for the program, if
necessary. For more information on this, and how to apply and follow
the GNU GPL, see <http://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your
program into proprietary programs. If your program is a subroutine
library, you may consider it more useful to permit linking proprietary
applications with the library. If this is what you want to do, use the
GNU Lesser General Public License instead of this License. But first,
please read <http://www.gnu.org/philosophy/why-not-lgpl.html>.

File: gcc.info, Node: GNU Free Documentation License, Next: Contributors, Prev: Copying, Up: Top
GNU Free Documentation License
******************************
Version 1.2, November 2002
Copyright (C) 2000,2001,2002 Free Software Foundation, Inc.
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
0. PREAMBLE
The purpose of this License is to make a manual, textbook, or other
functional and useful document "free" in the sense of freedom: to
assure everyone the effective freedom to copy and redistribute it,
with or without modifying it, either commercially or
noncommercially. Secondarily, this License preserves for the
author and publisher a way to get credit for their work, while not
being considered responsible for modifications made by others.
This License is a kind of "copyleft", which means that derivative
works of the document must themselves be free in the same sense.
It complements the GNU General Public License, which is a copyleft
license designed for free software.
We have designed this License in order to use it for manuals for
free software, because free software needs free documentation: a
free program should come with manuals providing the same freedoms
that the software does. But this License is not limited to
software manuals; it can be used for any textual work, regardless
of subject matter or whether it is published as a printed book. We
recommend this License principally for works whose purpose is
instruction or reference.
1. APPLICABILITY AND DEFINITIONS
This License applies to any manual or other work, in any medium,
that contains a notice placed by the copyright holder saying it can
be distributed under the terms of this License. Such a notice
grants a world-wide, royalty-free license, unlimited in duration,
to use that work under the conditions stated herein. The
"Document", below, refers to any such manual or work. Any member
of the public is a licensee, and is addressed as "you". You accept
the license if you copy, modify or distribute the work in a way
requiring permission under copyright law.
A "Modified Version" of the Document means any work containing the
Document or a portion of it, either copied verbatim, or with
modifications and/or translated into another language.
A "Secondary Section" is a named appendix or a front-matter section
of the Document that deals exclusively with the relationship of the
publishers or authors of the Document to the Document's overall
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fall directly within that overall subject. (Thus, if the Document
is in part a textbook of mathematics, a Secondary Section may not
explain any mathematics.) The relationship could be a matter of
historical connection with the subject or with related matters, or
of legal, commercial, philosophical, ethical or political position
regarding them.
The "Invariant Sections" are certain Secondary Sections whose
titles are designated, as being those of Invariant Sections, in the
notice that says that the Document is released under this License.
If a section does not fit the above definition of Secondary then it
is not allowed to be designated as Invariant. The Document may
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any Invariant Sections then there are none.
The "Cover Texts" are certain short passages of text that are
listed, as Front-Cover Texts or Back-Cover Texts, in the notice
that says that the Document is released under this License. A
Front-Cover Text may be at most 5 words, and a Back-Cover Text may
be at most 25 words.
A "Transparent" copy of the Document means a machine-readable copy,
represented in a format whose specification is available to the
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formatters or for automatic translation to a variety of formats
suitable for input to text formatters. A copy made in an otherwise
Transparent file format whose markup, or absence of markup, has
been arranged to thwart or discourage subsequent modification by
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used for any substantial amount of text. A copy that is not
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Examples of suitable formats for Transparent copies include plain
ASCII without markup, Texinfo input format, LaTeX input format,
SGML or XML using a publicly available DTD, and standard-conforming
simple HTML, PostScript or PDF designed for human modification.
Examples of transparent image formats include PNG, XCF and JPG.
Opaque formats include proprietary formats that can be read and
edited only by proprietary word processors, SGML or XML for which
the DTD and/or processing tools are not generally available, and
the machine-generated HTML, PostScript or PDF produced by some word
processors for output purposes only.
The "Title Page" means, for a printed book, the title page itself,
plus such following pages as are needed to hold, legibly, the
material this License requires to appear in the title page. For
works in formats which do not have any title page as such, "Title
Page" means the text near the most prominent appearance of the
work's title, preceding the beginning of the body of the text.
A section "Entitled XYZ" means a named subunit of the Document
whose title either is precisely XYZ or contains XYZ in parentheses
following text that translates XYZ in another language. (Here XYZ
stands for a specific section name mentioned below, such as
"Acknowledgements", "Dedications", "Endorsements", or "History".)
To "Preserve the Title" of such a section when you modify the
Document means that it remains a section "Entitled XYZ" according
to this definition.
The Document may include Warranty Disclaimers next to the notice
which states that this License applies to the Document. These
Warranty Disclaimers are considered to be included by reference in
this License, but only as regards disclaiming warranties: any other
implication that these Warranty Disclaimers may have is void and
has no effect on the meaning of this License.
2. VERBATIM COPYING
You may copy and distribute the Document in any medium, either
commercially or noncommercially, provided that this License, the
copyright notices, and the license notice saying this License
applies to the Document are reproduced in all copies, and that you
add no other conditions whatsoever to those of this License. You
may not use technical measures to obstruct or control the reading
or further copying of the copies you make or distribute. However,
you may accept compensation in exchange for copies. If you
distribute a large enough number of copies you must also follow the
conditions in section 3.
You may also lend copies, under the same conditions stated above,
and you may publicly display copies.
3. COPYING IN QUANTITY
If you publish printed copies (or copies in media that commonly
have printed covers) of the Document, numbering more than 100, and
the Document's license notice requires Cover Texts, you must
enclose the copies in covers that carry, clearly and legibly, all
these Cover Texts: Front-Cover Texts on the front cover, and
Back-Cover Texts on the back cover. Both covers must also clearly
and legibly identify you as the publisher of these copies. The
front cover must present the full title with all words of the title
equally prominent and visible. You may add other material on the
covers in addition. Copying with changes limited to the covers, as
long as they preserve the title of the Document and satisfy these
conditions, can be treated as verbatim copying in other respects.
If the required texts for either cover are too voluminous to fit
legibly, you should put the first ones listed (as many as fit
reasonably) on the actual cover, and continue the rest onto
adjacent pages.
If you publish or distribute Opaque copies of the Document
numbering more than 100, you must either include a machine-readable
Transparent copy along with each Opaque copy, or state in or with
each Opaque copy a computer-network location from which the general
network-using public has access to download using public-standard
network protocols a complete Transparent copy of the Document, free
of added material. If you use the latter option, you must take
reasonably prudent steps, when you begin distribution of Opaque
copies in quantity, to ensure that this Transparent copy will
remain thus accessible at the stated location until at least one
year after the last time you distribute an Opaque copy (directly or
through your agents or retailers) of that edition to the public.
It is requested, but not required, that you contact the authors of
the Document well before redistributing any large number of copies,
to give them a chance to provide you with an updated version of the
Document.
4. MODIFICATIONS
You may copy and distribute a Modified Version of the Document
under the conditions of sections 2 and 3 above, provided that you
release the Modified Version under precisely this License, with the
Modified Version filling the role of the Document, thus licensing
distribution and modification of the Modified Version to whoever
possesses a copy of it. In addition, you must do these things in
the Modified Version:
A. Use in the Title Page (and on the covers, if any) a title
distinct from that of the Document, and from those of previous
versions (which should, if there were any, be listed in the
History section of the Document). You may use the same title
as a previous version if the original publisher of that
version gives permission.
B. List on the Title Page, as authors, one or more persons or
entities responsible for authorship of the modifications in
the Modified Version, together with at least five of the
principal authors of the Document (all of its principal
authors, if it has fewer than five), unless they release you
from this requirement.
C. State on the Title page the name of the publisher of the
Modified Version, as the publisher.
D. Preserve all the copyright notices of the Document.
E. Add an appropriate copyright notice for your modifications
adjacent to the other copyright notices.
F. Include, immediately after the copyright notices, a license
notice giving the public permission to use the Modified
Version under the terms of this License, in the form shown in
the Addendum below.
G. Preserve in that license notice the full lists of Invariant
Sections and required Cover Texts given in the Document's
license notice.
H. Include an unaltered copy of this License.
I. Preserve the section Entitled "History", Preserve its Title,
and add to it an item stating at least the title, year, new
authors, and publisher of the Modified Version as given on the
Title Page. If there is no section Entitled "History" in the
Document, create one stating the title, year, authors, and
publisher of the Document as given on its Title Page, then add
an item describing the Modified Version as stated in the
previous sentence.
J. Preserve the network location, if any, given in the Document
for public access to a Transparent copy of the Document, and
likewise the network locations given in the Document for
previous versions it was based on. These may be placed in the
"History" section. You may omit a network location for a work
that was published at least four years before the Document
itself, or if the original publisher of the version it refers
to gives permission.
K. For any section Entitled "Acknowledgements" or "Dedications",
Preserve the Title of the section, and preserve in the section
all the substance and tone of each of the contributor
acknowledgements and/or dedications given therein.
L. Preserve all the Invariant Sections of the Document, unaltered
in their text and in their titles. Section numbers or the
equivalent are not considered part of the section titles.
M. Delete any section Entitled "Endorsements". Such a section
may not be included in the Modified Version.
N. Do not retitle any existing section to be Entitled
"Endorsements" or to conflict in title with any Invariant
Section.
O. Preserve any Warranty Disclaimers.
If the Modified Version includes new front-matter sections or
appendices that qualify as Secondary Sections and contain no
material copied from the Document, you may at your option designate
some or all of these sections as invariant. To do this, add their
titles to the list of Invariant Sections in the Modified Version's
license notice. These titles must be distinct from any other
section titles.
You may add a section Entitled "Endorsements", provided it contains
nothing but endorsements of your Modified Version by various
parties--for example, statements of peer review or that the text
has been approved by an organization as the authoritative
definition of a standard.
You may add a passage of up to five words as a Front-Cover Text,
and a passage of up to 25 words as a Back-Cover Text, to the end of
the list of Cover Texts in the Modified Version. Only one passage
of Front-Cover Text and one of Back-Cover Text may be added by (or
through arrangements made by) any one entity. If the Document
already includes a cover text for the same cover, previously added
by you or by arrangement made by the same entity you are acting on
behalf of, you may not add another; but you may replace the old
one, on explicit permission from the previous publisher that added
the old one.
The author(s) and publisher(s) of the Document do not by this
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File: gcc.info, Node: Contributors, Next: Option Index, Prev: GNU Free Documentation License, Up: Top
Contributors to GCC
*******************
The GCC project would like to thank its many contributors. Without them
the project would not have been nearly as successful as it has been.
Any omissions in this list are accidental. Feel free to contact
<law@redhat.com> or <gerald@pfeifer.com> if you have been left out or
some of your contributions are not listed. Please keep this list in
alphabetical order.
* Analog Devices helped implement the support for complex data types
and iterators.
* John David Anglin for threading-related fixes and improvements to
libstdc++-v3, and the HP-UX port.
* James van Artsdalen wrote the code that makes efficient use of the
Intel 80387 register stack.
* Abramo and Roberto Bagnara for the SysV68 Motorola 3300 Delta
Series port.
* Alasdair Baird for various bug fixes.
* Giovanni Bajo for analyzing lots of complicated C++ problem
reports.
* Peter Barada for his work to improve code generation for new
ColdFire cores.
* Gerald Baumgartner added the signature extension to the C++ front
end.
* Godmar Back for his Java improvements and encouragement.
* Scott Bambrough for help porting the Java compiler.
* Wolfgang Bangerth for processing tons of bug reports.
* Jon Beniston for his Microsoft Windows port of Java.
* Daniel Berlin for better DWARF2 support, faster/better
optimizations, improved alias analysis, plus migrating GCC to
Bugzilla.
* Geoff Berry for his Java object serialization work and various
patches.
* Uros Bizjak for the implementation of x87 math built-in functions
and for various middle end and i386 back end improvements and bug
fixes.
* Eric Blake for helping to make GCJ and libgcj conform to the
specifications.
* Janne Blomqvist for contributions to GNU Fortran.
* Segher Boessenkool for various fixes.
* Hans-J. Boehm for his garbage collector, IA-64 libffi port, and
other Java work.
* Neil Booth for work on cpplib, lang hooks, debug hooks and other
miscellaneous clean-ups.
* Steven Bosscher for integrating the GNU Fortran front end into GCC
and for contributing to the tree-ssa branch.
* Eric Botcazou for fixing middle- and backend bugs left and right.
* Per Bothner for his direction via the steering committee and
various improvements to the infrastructure for supporting new
languages. Chill front end implementation. Initial
implementations of cpplib, fix-header, config.guess, libio, and
past C++ library (libg++) maintainer. Dreaming up, designing and
implementing much of GCJ.
* Devon Bowen helped port GCC to the Tahoe.
* Don Bowman for mips-vxworks contributions.
* Dave Brolley for work on cpplib and Chill.
* Paul Brook for work on the ARM architecture and maintaining GNU
Fortran.
* Robert Brown implemented the support for Encore 32000 systems.
* Christian Bruel for improvements to local store elimination.
* Herman A.J. ten Brugge for various fixes.
* Joerg Brunsmann for Java compiler hacking and help with the GCJ
FAQ.
* Joe Buck for his direction via the steering committee.
* Craig Burley for leadership of the G77 Fortran effort.
* Stephan Buys for contributing Doxygen notes for libstdc++.
* Paolo Carlini for libstdc++ work: lots of efficiency improvements
to the C++ strings, streambufs and formatted I/O, hard detective
work on the frustrating localization issues, and keeping up with
the problem reports.
* John Carr for his alias work, SPARC hacking, infrastructure
improvements, previous contributions to the steering committee,
loop optimizations, etc.
* Stephane Carrez for 68HC11 and 68HC12 ports.
* Steve Chamberlain for support for the Renesas SH and H8 processors
and the PicoJava processor, and for GCJ config fixes.
* Glenn Chambers for help with the GCJ FAQ.
* John-Marc Chandonia for various libgcj patches.
* Scott Christley for his Objective-C contributions.
* Eric Christopher for his Java porting help and clean-ups.
* Branko Cibej for more warning contributions.
* The GNU Classpath project for all of their merged runtime code.
* Nick Clifton for arm, mcore, fr30, v850, m32r work, '--help', and
other random hacking.
* Michael Cook for libstdc++ cleanup patches to reduce warnings.
* R. Kelley Cook for making GCC buildable from a read-only directory
as well as other miscellaneous build process and documentation
clean-ups.
* Ralf Corsepius for SH testing and minor bug fixing.
* Stan Cox for care and feeding of the x86 port and lots of behind
the scenes hacking.
* Alex Crain provided changes for the 3b1.
* Ian Dall for major improvements to the NS32k port.
* Paul Dale for his work to add uClinux platform support to the m68k
backend.
* Dario Dariol contributed the four varieties of sample programs that
print a copy of their source.
* Russell Davidson for fstream and stringstream fixes in libstdc++.
* Bud Davis for work on the G77 and GNU Fortran compilers.
* Mo DeJong for GCJ and libgcj bug fixes.
* DJ Delorie for the DJGPP port, build and libiberty maintenance,
various bug fixes, and the M32C port.
* Arnaud Desitter for helping to debug GNU Fortran.
* Gabriel Dos Reis for contributions to G++, contributions and
maintenance of GCC diagnostics infrastructure, libstdc++-v3,
including 'valarray<>', 'complex<>', maintaining the numerics
library (including that pesky '<limits>' :-) and keeping up-to-date
anything to do with numbers.
* Ulrich Drepper for his work on glibc, testing of GCC using glibc,
ISO C99 support, CFG dumping support, etc., plus support of the C++
runtime libraries including for all kinds of C interface issues,
contributing and maintaining 'complex<>', sanity checking and
disbursement, configuration architecture, libio maintenance, and
early math work.
* Zdenek Dvorak for a new loop unroller and various fixes.
* Richard Earnshaw for his ongoing work with the ARM.
* David Edelsohn for his direction via the steering committee,
ongoing work with the RS6000/PowerPC port, help cleaning up Haifa
loop changes, doing the entire AIX port of libstdc++ with his bare
hands, and for ensuring GCC properly keeps working on AIX.
* Kevin Ediger for the floating point formatting of num_put::do_put
in libstdc++.
* Phil Edwards for libstdc++ work including configuration hackery,
documentation maintainer, chief breaker of the web pages, the
occasional iostream bug fix, and work on shared library symbol
versioning.
* Paul Eggert for random hacking all over GCC.
* Mark Elbrecht for various DJGPP improvements, and for libstdc++
configuration support for locales and fstream-related fixes.
* Vadim Egorov for libstdc++ fixes in strings, streambufs, and
iostreams.
* Christian Ehrhardt for dealing with bug reports.
* Ben Elliston for his work to move the Objective-C runtime into its
own subdirectory and for his work on autoconf.
* Revital Eres for work on the PowerPC 750CL port.
* Marc Espie for OpenBSD support.
* Doug Evans for much of the global optimization framework, arc,
m32r, and SPARC work.
* Christopher Faylor for his work on the Cygwin port and for caring
and feeding the gcc.gnu.org box and saving its users tons of spam.
* Fred Fish for BeOS support and Ada fixes.
* Ivan Fontes Garcia for the Portuguese translation of the GCJ FAQ.
* Peter Gerwinski for various bug fixes and the Pascal front end.
* Kaveh R. Ghazi for his direction via the steering committee,
amazing work to make '-W -Wall -W* -Werror' useful, and
continuously testing GCC on a plethora of platforms. Kaveh extends
his gratitude to the CAIP Center at Rutgers University for
providing him with computing resources to work on Free Software
since the late 1980s.
* John Gilmore for a donation to the FSF earmarked improving GNU
Java.
* Judy Goldberg for c++ contributions.
* Torbjorn Granlund for various fixes and the c-torture testsuite,
multiply- and divide-by-constant optimization, improved long long
support, improved leaf function register allocation, and his
direction via the steering committee.
* Anthony Green for his '-Os' contributions and Java front end work.
* Stu Grossman for gdb hacking, allowing GCJ developers to debug Java
code.
* Michael K. Gschwind contributed the port to the PDP-11.
* Ron Guilmette implemented the 'protoize' and 'unprotoize' tools,
the support for Dwarf symbolic debugging information, and much of
the support for System V Release 4. He has also worked heavily on
the Intel 386 and 860 support.
* Mostafa Hagog for Swing Modulo Scheduling (SMS) and post reload
GCSE.
* Bruno Haible for improvements in the runtime overhead for EH, new
warnings and assorted bug fixes.
* Andrew Haley for his amazing Java compiler and library efforts.
* Chris Hanson assisted in making GCC work on HP-UX for the 9000
series 300.
* Michael Hayes for various thankless work he's done trying to get
the c30/c40 ports functional. Lots of loop and unroll improvements
and fixes.
* Dara Hazeghi for wading through myriads of target-specific bug
reports.
* Kate Hedstrom for staking the G77 folks with an initial testsuite.
* Richard Henderson for his ongoing SPARC, alpha, ia32, and ia64
work, loop opts, and generally fixing lots of old problems we've
ignored for years, flow rewrite and lots of further stuff,
including reviewing tons of patches.
* Aldy Hernandez for working on the PowerPC port, SIMD support, and
various fixes.
* Nobuyuki Hikichi of Software Research Associates, Tokyo,
contributed the support for the Sony NEWS machine.
* Kazu Hirata for caring and feeding the Renesas H8/300 port and
various fixes.
* Katherine Holcomb for work on GNU Fortran.
* Manfred Hollstein for his ongoing work to keep the m88k alive, lots
of testing and bug fixing, particularly of GCC configury code.
* Steve Holmgren for MachTen patches.
* Jan Hubicka for his x86 port improvements.
* Falk Hueffner for working on C and optimization bug reports.
* Bernardo Innocenti for his m68k work, including merging of ColdFire
improvements and uClinux support.
* Christian Iseli for various bug fixes.
* Kamil Iskra for general m68k hacking.
* Lee Iverson for random fixes and MIPS testing.
* Andreas Jaeger for testing and benchmarking of GCC and various bug
fixes.
* Jakub Jelinek for his SPARC work and sibling call optimizations as
well as lots of bug fixes and test cases, and for improving the
Java build system.
* Janis Johnson for ia64 testing and fixes, her quality improvement
sidetracks, and web page maintenance.
* Kean Johnston for SCO OpenServer support and various fixes.
* Tim Josling for the sample language treelang based originally on
Richard Kenner's "toy" language.
* Nicolai Josuttis for additional libstdc++ documentation.
* Klaus Kaempf for his ongoing work to make alpha-vms a viable
target.
* Steven G. Kargl for work on GNU Fortran.
* David Kashtan of SRI adapted GCC to VMS.
* Ryszard Kabatek for many, many libstdc++ bug fixes and
optimizations of strings, especially member functions, and for
auto_ptr fixes.
* Geoffrey Keating for his ongoing work to make the PPC work for
GNU/Linux and his automatic regression tester.
* Brendan Kehoe for his ongoing work with G++ and for a lot of early
work in just about every part of libstdc++.
* Oliver M. Kellogg of Deutsche Aerospace contributed the port to the
MIL-STD-1750A.
* Richard Kenner of the New York University Ultracomputer Research
Laboratory wrote the machine descriptions for the AMD 29000, the
DEC Alpha, the IBM RT PC, and the IBM RS/6000 as well as the
support for instruction attributes. He also made changes to better
support RISC processors including changes to common subexpression
elimination, strength reduction, function calling sequence
handling, and condition code support, in addition to generalizing
the code for frame pointer elimination and delay slot scheduling.
Richard Kenner was also the head maintainer of GCC for several
years.
* Mumit Khan for various contributions to the Cygwin and Mingw32
ports and maintaining binary releases for Microsoft Windows hosts,
and for massive libstdc++ porting work to Cygwin/Mingw32.
* Robin Kirkham for cpu32 support.
* Mark Klein for PA improvements.
* Thomas Koenig for various bug fixes.
* Bruce Korb for the new and improved fixincludes code.
* Benjamin Kosnik for his G++ work and for leading the libstdc++-v3
effort.
* Charles LaBrec contributed the support for the Integrated Solutions
68020 system.
* Asher Langton and Mike Kumbera for contributing Cray pointer
support to GNU Fortran, and for other GNU Fortran improvements.
* Jeff Law for his direction via the steering committee, coordinating
the entire egcs project and GCC 2.95, rolling out snapshots and
releases, handling merges from GCC2, reviewing tons of patches that
might have fallen through the cracks else, and random but extensive
hacking.
* Marc Lehmann for his direction via the steering committee and
helping with analysis and improvements of x86 performance.
* Victor Leikehman for work on GNU Fortran.
* Ted Lemon wrote parts of the RTL reader and printer.
* Kriang Lerdsuwanakij for C++ improvements including template as
template parameter support, and many C++ fixes.
* Warren Levy for tremendous work on libgcj (Java Runtime Library)
and random work on the Java front end.
* Alain Lichnewsky ported GCC to the MIPS CPU.
* Oskar Liljeblad for hacking on AWT and his many Java bug reports
and patches.
* Robert Lipe for OpenServer support, new testsuites, testing, etc.
* Chen Liqin for various S+core related fixes/improvement, and for
maintaining the S+core port.
* Weiwen Liu for testing and various bug fixes.
* Manuel Lo'pez-Iba'n~ez for improving '-Wconversion' and many other
diagnostics fixes and improvements.
* Dave Love for his ongoing work with the Fortran front end and
runtime libraries.
* Martin von Lo"wis for internal consistency checking infrastructure,
various C++ improvements including namespace support, and tons of
assistance with libstdc++/compiler merges.
* H.J. Lu for his previous contributions to the steering committee,
many x86 bug reports, prototype patches, and keeping the GNU/Linux
ports working.
* Greg McGary for random fixes and (someday) bounded pointers.
* Andrew MacLeod for his ongoing work in building a real EH system,
various code generation improvements, work on the global optimizer,
etc.
* Vladimir Makarov for hacking some ugly i960 problems, PowerPC
hacking improvements to compile-time performance, overall knowledge
and direction in the area of instruction scheduling, and design and
implementation of the automaton based instruction scheduler.
* Bob Manson for his behind the scenes work on dejagnu.
* Philip Martin for lots of libstdc++ string and vector iterator
fixes and improvements, and string clean up and testsuites.
* All of the Mauve project contributors, for Java test code.
* Bryce McKinlay for numerous GCJ and libgcj fixes and improvements.
* Adam Megacz for his work on the Microsoft Windows port of GCJ.
* Michael Meissner for LRS framework, ia32, m32r, v850, m88k, MIPS,
powerpc, haifa, ECOFF debug support, and other assorted hacking.
* Jason Merrill for his direction via the steering committee and
leading the G++ effort.
* Martin Michlmayr for testing GCC on several architectures using the
entire Debian archive.
* David Miller for his direction via the steering committee, lots of
SPARC work, improvements in jump.c and interfacing with the Linux
kernel developers.
* Gary Miller ported GCC to Charles River Data Systems machines.
* Alfred Minarik for libstdc++ string and ios bug fixes, and turning
the entire libstdc++ testsuite namespace-compatible.
* Mark Mitchell for his direction via the steering committee,
mountains of C++ work, load/store hoisting out of loops, alias
analysis improvements, ISO C 'restrict' support, and serving as
release manager for GCC 3.x.
* Alan Modra for various GNU/Linux bits and testing.
* Toon Moene for his direction via the steering committee, Fortran
maintenance, and his ongoing work to make us make Fortran run fast.
* Jason Molenda for major help in the care and feeding of all the
services on the gcc.gnu.org (formerly egcs.cygnus.com)
machine--mail, web services, ftp services, etc etc. Doing all this
work on scrap paper and the backs of envelopes would have been...
difficult.
* Catherine Moore for fixing various ugly problems we have sent her
way, including the haifa bug which was killing the Alpha & PowerPC
Linux kernels.
* Mike Moreton for his various Java patches.
* David Mosberger-Tang for various Alpha improvements, and for the
initial IA-64 port.
* Stephen Moshier contributed the floating point emulator that
assists in cross-compilation and permits support for floating point
numbers wider than 64 bits and for ISO C99 support.
* Bill Moyer for his behind the scenes work on various issues.
* Philippe De Muyter for his work on the m68k port.
* Joseph S. Myers for his work on the PDP-11 port, format checking
and ISO C99 support, and continuous emphasis on (and contributions
to) documentation.
* Nathan Myers for his work on libstdc++-v3: architecture and
authorship through the first three snapshots, including
implementation of locale infrastructure, string, shadow C headers,
and the initial project documentation (DESIGN, CHECKLIST, and so
forth). Later, more work on MT-safe string and shadow headers.
* Felix Natter for documentation on porting libstdc++.
* Nathanael Nerode for cleaning up the configuration/build process.
* NeXT, Inc. donated the front end that supports the Objective-C
language.
* Hans-Peter Nilsson for the CRIS and MMIX ports, improvements to the
search engine setup, various documentation fixes and other small
fixes.
* Geoff Noer for his work on getting cygwin native builds working.
* Diego Novillo for his work on Tree SSA, OpenMP, SPEC performance
tracking web pages and assorted fixes.
* David O'Brien for the FreeBSD/alpha, FreeBSD/AMD x86-64,
FreeBSD/ARM, FreeBSD/PowerPC, and FreeBSD/SPARC64 ports and related
infrastructure improvements.
* Alexandre Oliva for various build infrastructure improvements,
scripts and amazing testing work, including keeping libtool issues
sane and happy.
* Stefan Olsson for work on mt_alloc.
* Melissa O'Neill for various NeXT fixes.
* Rainer Orth for random MIPS work, including improvements to GCC's
o32 ABI support, improvements to dejagnu's MIPS support, Java
configuration clean-ups and porting work, etc.
* Hartmut Penner for work on the s390 port.
* Paul Petersen wrote the machine description for the Alliant FX/8.
* Alexandre Petit-Bianco for implementing much of the Java compiler
and continued Java maintainership.
* Matthias Pfaller for major improvements to the NS32k port.
* Gerald Pfeifer for his direction via the steering committee,
pointing out lots of problems we need to solve, maintenance of the
web pages, and taking care of documentation maintenance in general.
* Andrew Pinski for processing bug reports by the dozen.
* Ovidiu Predescu for his work on the Objective-C front end and
runtime libraries.
* Jerry Quinn for major performance improvements in C++ formatted
I/O.
* Ken Raeburn for various improvements to checker, MIPS ports and
various cleanups in the compiler.
* Rolf W. Rasmussen for hacking on AWT.
* David Reese of Sun Microsystems contributed to the Solaris on
PowerPC port.
* Volker Reichelt for keeping up with the problem reports.
* Joern Rennecke for maintaining the sh port, loop, regmove & reload
hacking.
* Loren J. Rittle for improvements to libstdc++-v3 including the
FreeBSD port, threading fixes, thread-related configury changes,
critical threading documentation, and solutions to really tricky
I/O problems, as well as keeping GCC properly working on FreeBSD
and continuous testing.
* Craig Rodrigues for processing tons of bug reports.
* Ola Ro"nnerup for work on mt_alloc.
* Gavin Romig-Koch for lots of behind the scenes MIPS work.
* David Ronis inspired and encouraged Craig to rewrite the G77
documentation in texinfo format by contributing a first pass at a
translation of the old 'g77-0.5.16/f/DOC' file.
* Ken Rose for fixes to GCC's delay slot filling code.
* Paul Rubin wrote most of the preprocessor.
* Pe'tur Runo'lfsson for major performance improvements in C++
formatted I/O and large file support in C++ filebuf.
* Chip Salzenberg for libstdc++ patches and improvements to locales,
traits, Makefiles, libio, libtool hackery, and "long long" support.
* Juha Sarlin for improvements to the H8 code generator.
* Greg Satz assisted in making GCC work on HP-UX for the 9000 series
300.
* Roger Sayle for improvements to constant folding and GCC's RTL
optimizers as well as for fixing numerous bugs.
* Bradley Schatz for his work on the GCJ FAQ.
* Peter Schauer wrote the code to allow debugging to work on the
Alpha.
* William Schelter did most of the work on the Intel 80386 support.
* Tobias Schlu"ter for work on GNU Fortran.
* Bernd Schmidt for various code generation improvements and major
work in the reload pass as well a serving as release manager for
GCC 2.95.3.
* Peter Schmid for constant testing of libstdc++--especially
application testing, going above and beyond what was requested for
the release criteria--and libstdc++ header file tweaks.
* Jason Schroeder for jcf-dump patches.
* Andreas Schwab for his work on the m68k port.
* Lars Segerlund for work on GNU Fortran.
* Joel Sherrill for his direction via the steering committee, RTEMS
contributions and RTEMS testing.
* Nathan Sidwell for many C++ fixes/improvements.
* Jeffrey Siegal for helping RMS with the original design of GCC,
some code which handles the parse tree and RTL data structures,
constant folding and help with the original VAX & m68k ports.
* Kenny Simpson for prompting libstdc++ fixes due to defect reports
from the LWG (thereby keeping GCC in line with updates from the
ISO).
* Franz Sirl for his ongoing work with making the PPC port stable for
GNU/Linux.
* Andrey Slepuhin for assorted AIX hacking.
* Trevor Smigiel for contributing the SPU port.
* Christopher Smith did the port for Convex machines.
* Danny Smith for his major efforts on the Mingw (and Cygwin) ports.
* Randy Smith finished the Sun FPA support.
* Scott Snyder for queue, iterator, istream, and string fixes and
libstdc++ testsuite entries. Also for providing the patch to G77
to add rudimentary support for 'INTEGER*1', 'INTEGER*2', and
'LOGICAL*1'.
* Brad Spencer for contributions to the GLIBCPP_FORCE_NEW technique.
* Richard Stallman, for writing the original GCC and launching the
GNU project.
* Jan Stein of the Chalmers Computer Society provided support for
Genix, as well as part of the 32000 machine description.
* Nigel Stephens for various mips16 related fixes/improvements.
* Jonathan Stone wrote the machine description for the Pyramid
computer.
* Graham Stott for various infrastructure improvements.
* John Stracke for his Java HTTP protocol fixes.
* Mike Stump for his Elxsi port, G++ contributions over the years and
more recently his vxworks contributions
* Jeff Sturm for Java porting help, bug fixes, and encouragement.
* Shigeya Suzuki for this fixes for the bsdi platforms.
* Ian Lance Taylor for his mips16 work, general configury hacking,
fixincludes, etc.
* Holger Teutsch provided the support for the Clipper CPU.
* Gary Thomas for his ongoing work to make the PPC work for
GNU/Linux.
* Philipp Thomas for random bug fixes throughout the compiler
* Jason Thorpe for thread support in libstdc++ on NetBSD.
* Kresten Krab Thorup wrote the run time support for the Objective-C
language and the fantastic Java bytecode interpreter.
* Michael Tiemann for random bug fixes, the first instruction
scheduler, initial C++ support, function integration, NS32k, SPARC
and M88k machine description work, delay slot scheduling.
* Andreas Tobler for his work porting libgcj to Darwin.
* Teemu Torma for thread safe exception handling support.
* Leonard Tower wrote parts of the parser, RTL generator, and RTL
definitions, and of the VAX machine description.
* Tom Tromey for internationalization support and for his many Java
contributions and libgcj maintainership.
* Lassi Tuura for improvements to config.guess to determine HP
processor types.
* Petter Urkedal for libstdc++ CXXFLAGS, math, and algorithms fixes.
* Andy Vaught for the design and initial implementation of the GNU
Fortran front end.
* Brent Verner for work with the libstdc++ cshadow files and their
associated configure steps.
* Todd Vierling for contributions for NetBSD ports.
* Jonathan Wakely for contributing libstdc++ Doxygen notes and XHTML
guidance.
* Dean Wakerley for converting the install documentation from HTML to
texinfo in time for GCC 3.0.
* Krister Walfridsson for random bug fixes.
* Feng Wang for contributions to GNU Fortran.
* Stephen M. Webb for time and effort on making libstdc++ shadow
files work with the tricky Solaris 8+ headers, and for pushing the
build-time header tree.
* John Wehle for various improvements for the x86 code generator,
related infrastructure improvements to help x86 code generation,
value range propagation and other work, WE32k port.
* Ulrich Weigand for work on the s390 port.
* Zack Weinberg for major work on cpplib and various other bug fixes.
* Matt Welsh for help with Linux Threads support in GCJ.
* Urban Widmark for help fixing java.io.
* Mark Wielaard for new Java library code and his work integrating
with Classpath.
* Dale Wiles helped port GCC to the Tahoe.
* Bob Wilson from Tensilica, Inc. for the Xtensa port.
* Jim Wilson for his direction via the steering committee, tackling
hard problems in various places that nobody else wanted to work on,
strength reduction and other loop optimizations.
* Paul Woegerer and Tal Agmon for the CRX port.
* Carlo Wood for various fixes.
* Tom Wood for work on the m88k port.
* Canqun Yang for work on GNU Fortran.
* Masanobu Yuhara of Fujitsu Laboratories implemented the machine
description for the Tron architecture (specifically, the Gmicro).
* Kevin Zachmann helped port GCC to the Tahoe.
* Ayal Zaks for Swing Modulo Scheduling (SMS).
* Xiaoqiang Zhang for work on GNU Fortran.
* Gilles Zunino for help porting Java to Irix.
The following people are recognized for their contributions to GNAT,
the Ada front end of GCC:
* Bernard Banner
* Romain Berrendonner
* Geert Bosch
* Emmanuel Briot
* Joel Brobecker
* Ben Brosgol
* Vincent Celier
* Arnaud Charlet
* Chien Chieng
* Cyrille Comar
* Cyrille Crozes
* Robert Dewar
* Gary Dismukes
* Robert Duff
* Ed Falis
* Ramon Fernandez
* Sam Figueroa
* Vasiliy Fofanov
* Michael Friess
* Franco Gasperoni
* Ted Giering
* Matthew Gingell
* Laurent Guerby
* Jerome Guitton
* Olivier Hainque
* Jerome Hugues
* Hristian Kirtchev
* Jerome Lambourg
* Bruno Leclerc
* Albert Lee
* Sean McNeil
* Javier Miranda
* Laurent Nana
* Pascal Obry
* Dong-Ik Oh
* Laurent Pautet
* Brett Porter
* Thomas Quinot
* Nicolas Roche
* Pat Rogers
* Jose Ruiz
* Douglas Rupp
* Sergey Rybin
* Gail Schenker
* Ed Schonberg
* Nicolas Setton
* Samuel Tardieu
The following people are recognized for their contributions of new
features, bug reports, testing and integration of classpath/libgcj for
GCC version 4.1:
* Lillian Angel for 'JTree' implementation and lots Free Swing
additions and bug fixes.
* Wolfgang Baer for 'GapContent' bug fixes.
* Anthony Balkissoon for 'JList', Free Swing 1.5 updates and mouse
event fixes, lots of Free Swing work including 'JTable' editing.
* Stuart Ballard for RMI constant fixes.
* Goffredo Baroncelli for 'HTTPURLConnection' fixes.
* Gary Benson for 'MessageFormat' fixes.
* Daniel Bonniot for 'Serialization' fixes.
* Chris Burdess for lots of gnu.xml and http protocol fixes, 'StAX'
and 'DOM xml:id' support.
* Ka-Hing Cheung for 'TreePath' and 'TreeSelection' fixes.
* Archie Cobbs for build fixes, VM interface updates,
'URLClassLoader' updates.
* Kelley Cook for build fixes.
* Martin Cordova for Suggestions for better 'SocketTimeoutException'.
* David Daney for 'BitSet' bug fixes, 'HttpURLConnection' rewrite and
improvements.
* Thomas Fitzsimmons for lots of upgrades to the gtk+ AWT and Cairo
2D support. Lots of imageio framework additions, lots of AWT and
Free Swing bug fixes.
* Jeroen Frijters for 'ClassLoader' and nio cleanups, serialization
fixes, better 'Proxy' support, bug fixes and IKVM integration.
* Santiago Gala for 'AccessControlContext' fixes.
* Nicolas Geoffray for 'VMClassLoader' and 'AccessController'
improvements.
* David Gilbert for 'basic' and 'metal' icon and plaf support and
lots of documenting, Lots of Free Swing and metal theme additions.
'MetalIconFactory' implementation.
* Anthony Green for 'MIDI' framework, 'ALSA' and 'DSSI' providers.
* Andrew Haley for 'Serialization' and 'URLClassLoader' fixes, gcj
build speedups.
* Kim Ho for 'JFileChooser' implementation.
* Andrew John Hughes for 'Locale' and net fixes, URI RFC2986 updates,
'Serialization' fixes, 'Properties' XML support and generic branch
work, VMIntegration guide update.
* Bastiaan Huisman for 'TimeZone' bug fixing.
* Andreas Jaeger for mprec updates.
* Paul Jenner for better '-Werror' support.
* Ito Kazumitsu for 'NetworkInterface' implementation and updates.
* Roman Kennke for 'BoxLayout', 'GrayFilter' and 'SplitPane', plus
bug fixes all over. Lots of Free Swing work including styled text.
* Simon Kitching for 'String' cleanups and optimization suggestions.
* Michael Koch for configuration fixes, 'Locale' updates, bug and
build fixes.
* Guilhem Lavaux for configuration, thread and channel fixes and
Kaffe integration. JCL native 'Pointer' updates. Logger bug
fixes.
* David Lichteblau for JCL support library global/local reference
cleanups.
* Aaron Luchko for JDWP updates and documentation fixes.
* Ziga Mahkovec for 'Graphics2D' upgraded to Cairo 0.5 and new regex
features.
* Sven de Marothy for BMP imageio support, CSS and 'TextLayout'
fixes. 'GtkImage' rewrite, 2D, awt, free swing and date/time fixes
and implementing the Qt4 peers.
* Casey Marshall for crypto algorithm fixes, 'FileChannel' lock,
'SystemLogger' and 'FileHandler' rotate implementations, NIO
'FileChannel.map' support, security and policy updates.
* Bryce McKinlay for RMI work.
* Audrius Meskauskas for lots of Free Corba, RMI and HTML work plus
testing and documenting.
* Kalle Olavi Niemitalo for build fixes.
* Rainer Orth for build fixes.
* Andrew Overholt for 'File' locking fixes.
* Ingo Proetel for 'Image', 'Logger' and 'URLClassLoader' updates.
* Olga Rodimina for 'MenuSelectionManager' implementation.
* Jan Roehrich for 'BasicTreeUI' and 'JTree' fixes.
* Julian Scheid for documentation updates and gjdoc support.
* Christian Schlichtherle for zip fixes and cleanups.
* Robert Schuster for documentation updates and beans fixes,
'TreeNode' enumerations and 'ActionCommand' and various fixes, XML
and URL, AWT and Free Swing bug fixes.
* Keith Seitz for lots of JDWP work.
* Christian Thalinger for 64-bit cleanups, Configuration and VM
interface fixes and 'CACAO' integration, 'fdlibm' updates.
* Gael Thomas for 'VMClassLoader' boot packages support suggestions.
* Andreas Tobler for Darwin and Solaris testing and fixing, 'Qt4'
support for Darwin/OS X, 'Graphics2D' support, 'gtk+' updates.
* Dalibor Topic for better 'DEBUG' support, build cleanups and Kaffe
integration. 'Qt4' build infrastructure, 'SHA1PRNG' and
'GdkPixbugDecoder' updates.
* Tom Tromey for Eclipse integration, generics work, lots of bug
fixes and gcj integration including coordinating The Big Merge.
* Mark Wielaard for bug fixes, packaging and release management,
'Clipboard' implementation, system call interrupts and network
timeouts and 'GdkPixpufDecoder' fixes.
In addition to the above, all of which also contributed time and energy
in testing GCC, we would like to thank the following for their
contributions to testing:
* Michael Abd-El-Malek
* Thomas Arend
* Bonzo Armstrong
* Steven Ashe
* Chris Baldwin
* David Billinghurst
* Jim Blandy
* Stephane Bortzmeyer
* Horst von Brand
* Frank Braun
* Rodney Brown
* Sidney Cadot
* Bradford Castalia
* Jonathan Corbet
* Ralph Doncaster
* Richard Emberson
* Levente Farkas
* Graham Fawcett
* Mark Fernyhough
* Robert A. French
* Jo"rgen Freyh
* Mark K. Gardner
* Charles-Antoine Gauthier
* Yung Shing Gene
* David Gilbert
* Simon Gornall
* Fred Gray
* John Griffin
* Patrik Hagglund
* Phil Hargett
* Amancio Hasty
* Takafumi Hayashi
* Bryan W. Headley
* Kevin B. Hendricks
* Joep Jansen
* Christian Joensson
* Michel Kern
* David Kidd
* Tobias Kuipers
* Anand Krishnaswamy
* A. O. V. Le Blanc
* llewelly
* Damon Love
* Brad Lucier
* Matthias Klose
* Martin Knoblauch
* Rick Lutowski
* Jesse Macnish
* Stefan Morrell
* Anon A. Mous
* Matthias Mueller
* Pekka Nikander
* Rick Niles
* Jon Olson
* Magnus Persson
* Chris Pollard
* Richard Polton
* Derk Reefman
* David Rees
* Paul Reilly
* Tom Reilly
* Torsten Rueger
* Danny Sadinoff
* Marc Schifer
* Erik Schnetter
* Wayne K. Schroll
* David Schuler
* Vin Shelton
* Tim Souder
* Adam Sulmicki
* Bill Thorson
* George Talbot
* Pedro A. M. Vazquez
* Gregory Warnes
* Ian Watson
* David E. Young
* And many others
And finally we'd like to thank everyone who uses the compiler, submits
bug reports and generally reminds us why we're doing this work in the
first place.

File: gcc.info, Node: Option Index, Next: Keyword Index, Prev: Contributors, Up: Top
Option Index
************
GCC's command line options are indexed here without any initial '-' or
'--'. Where an option has both positive and negative forms (such as
'-fOPTION' and '-fno-OPTION'), relevant entries in the manual are
indexed under the most appropriate form; it may sometimes be useful to
look up both forms.
�[index�]
* Menu:
* ###: Overall Options. (line 200)
* A: Preprocessor Options.
(line 541)
* allowable_client: Darwin Options. (line 198)
* all_load: Darwin Options. (line 111)
* ansi: Standards. (line 16)
* ansi <1>: C Dialect Options. (line 11)
* ansi <2>: Preprocessor Options.
(line 330)
* ansi <3>: Other Builtins. (line 22)
* ansi <4>: Non-bugs. (line 107)
* arch_errors_fatal: Darwin Options. (line 115)
* aux-info: C Dialect Options. (line 140)
* B: Directory Options. (line 39)
* b: Target Options. (line 13)
* bcopy-builtin: PDP-11 Options. (line 32)
* Bdynamic: VxWorks Options. (line 22)
* bind_at_load: Darwin Options. (line 119)
* Bstatic: VxWorks Options. (line 22)
* bundle: Darwin Options. (line 124)
* bundle_loader: Darwin Options. (line 128)
* c: Overall Options. (line 155)
* C: Preprocessor Options.
(line 591)
* c <1>: Link Options. (line 20)
* client_name: Darwin Options. (line 198)
* combine: Overall Options. (line 211)
* compatibility_version: Darwin Options. (line 198)
* coverage: Debugging Options. (line 258)
* current_version: Darwin Options. (line 198)
* d: Debugging Options. (line 321)
* D: Preprocessor Options.
(line 33)
* dA: Debugging Options. (line 335)
* da: Debugging Options. (line 489)
* dB: Debugging Options. (line 340)
* dc: Debugging Options. (line 344)
* dC: Debugging Options. (line 350)
* dd: Debugging Options. (line 358)
* dD: Debugging Options. (line 364)
* dD <1>: Preprocessor Options.
(line 572)
* dE: Debugging Options. (line 369)
* dead_strip: Darwin Options. (line 198)
* dependency-file: Darwin Options. (line 198)
* df: Debugging Options. (line 374)
* dg: Debugging Options. (line 381)
* dG: Debugging Options. (line 386)
* dh: Debugging Options. (line 393)
* dH: Debugging Options. (line 492)
* di: Debugging Options. (line 397)
* dI: Preprocessor Options.
(line 581)
* dj: Debugging Options. (line 401)
* dk: Debugging Options. (line 405)
* dl: Debugging Options. (line 411)
* dL: Debugging Options. (line 415)
* dm: Debugging Options. (line 422)
* dM: Debugging Options. (line 426)
* dm <1>: Debugging Options. (line 495)
* dM <1>: Preprocessor Options.
(line 557)
* dn: Debugging Options. (line 431)
* dN: Debugging Options. (line 435)
* dN <1>: Preprocessor Options.
(line 578)
* do: Debugging Options. (line 439)
* dp: Debugging Options. (line 499)
* dP: Debugging Options. (line 504)
* dr: Debugging Options. (line 443)
* dR: Debugging Options. (line 447)
* ds: Debugging Options. (line 451)
* dS: Debugging Options. (line 456)
* dt: Debugging Options. (line 460)
* dT: Debugging Options. (line 465)
* dumpmachine: Debugging Options. (line 865)
* dumpspecs: Debugging Options. (line 873)
* dumpversion: Debugging Options. (line 869)
* dV: Debugging Options. (line 470)
* dv: Debugging Options. (line 508)
* dw: Debugging Options. (line 477)
* dx: Debugging Options. (line 513)
* dy: Debugging Options. (line 517)
* dylib_file: Darwin Options. (line 198)
* dylinker_install_name: Darwin Options. (line 198)
* dynamic: Darwin Options. (line 198)
* dynamiclib: Darwin Options. (line 132)
* dz: Debugging Options. (line 481)
* dZ: Debugging Options. (line 485)
* E: Overall Options. (line 176)
* E <1>: Link Options. (line 20)
* EB: ARC Options. (line 12)
* EB <1>: MIPS Options. (line 7)
* EL: ARC Options. (line 9)
* EL <1>: MIPS Options. (line 10)
* exported_symbols_list: Darwin Options. (line 198)
* F: Darwin Options. (line 31)
* fabi-version: C++ Dialect Options.
(line 19)
* falign-functions: Optimize Options. (line 1007)
* falign-jumps: Optimize Options. (line 1057)
* falign-labels: Optimize Options. (line 1025)
* falign-loops: Optimize Options. (line 1043)
* fargument-alias: Code Gen Options. (line 377)
* fargument-noalias: Code Gen Options. (line 377)
* fargument-noalias-anything: Code Gen Options. (line 377)
* fargument-noalias-global: Code Gen Options. (line 377)
* fassociative-math: Optimize Options. (line 1232)
* fasynchronous-unwind-tables: Code Gen Options. (line 63)
* fauto-inc-dec: Optimize Options. (line 445)
* fbounds-check: Code Gen Options. (line 15)
* fbranch-probabilities: Optimize Options. (line 1353)
* fbranch-target-load-optimize: Optimize Options. (line 1461)
* fbranch-target-load-optimize2: Optimize Options. (line 1467)
* fbtr-bb-exclusive: Optimize Options. (line 1471)
* fcall-saved: Code Gen Options. (line 249)
* fcall-used: Code Gen Options. (line 235)
* fcaller-saves: Optimize Options. (line 606)
* fcheck-data-deps: Optimize Options. (line 737)
* fcheck-new: C++ Dialect Options.
(line 33)
* fcommon: Variable Attributes.
(line 99)
* fcond-mismatch: C Dialect Options. (line 261)
* fconserve-space: C++ Dialect Options.
(line 43)
* fconstant-string-class: Objective-C and Objective-C++ Dialect Options.
(line 30)
* fcprop-registers: Optimize Options. (line 1135)
* fcrossjumping: Optimize Options. (line 438)
* fcse-follow-jumps: Optimize Options. (line 366)
* fcse-skip-blocks: Optimize Options. (line 375)
* fcx-limited-range: Optimize Options. (line 1340)
* fdata-sections: Optimize Options. (line 1442)
* fdbg-cnt: Debugging Options. (line 310)
* fdbg-cnt-list: Debugging Options. (line 307)
* fdce: Optimize Options. (line 451)
* fdebug-prefix-map: Debugging Options. (line 210)
* fdelayed-branch: Optimize Options. (line 505)
* fdelete-null-pointer-checks: Optimize Options. (line 474)
* fdiagnostics-show-location: Language Independent Options.
(line 21)
* fdiagnostics-show-option: Language Independent Options.
(line 36)
* fdirectives-only: Preprocessor Options.
(line 451)
* fdollars-in-identifiers: Preprocessor Options.
(line 472)
* fdollars-in-identifiers <1>: Interoperation. (line 146)
* fdse: Optimize Options. (line 455)
* fdump-class-hierarchy: Debugging Options. (line 542)
* fdump-ipa: Debugging Options. (line 549)
* fdump-noaddr: Debugging Options. (line 520)
* fdump-rtl-all: Debugging Options. (line 489)
* fdump-rtl-bbro: Debugging Options. (line 340)
* fdump-rtl-btl: Debugging Options. (line 358)
* fdump-rtl-bypass: Debugging Options. (line 386)
* fdump-rtl-ce1: Debugging Options. (line 350)
* fdump-rtl-ce2: Debugging Options. (line 350)
* fdump-rtl-ce3: Debugging Options. (line 369)
* fdump-rtl-cfg: Debugging Options. (line 374)
* fdump-rtl-combine: Debugging Options. (line 344)
* fdump-rtl-cse: Debugging Options. (line 451)
* fdump-rtl-cse2: Debugging Options. (line 460)
* fdump-rtl-dbr: Debugging Options. (line 358)
* fdump-rtl-eh: Debugging Options. (line 393)
* fdump-rtl-expand: Debugging Options. (line 443)
* fdump-rtl-flow2: Debugging Options. (line 477)
* fdump-rtl-gcse: Debugging Options. (line 386)
* fdump-rtl-greg: Debugging Options. (line 381)
* fdump-rtl-jump: Debugging Options. (line 401)
* fdump-rtl-life: Debugging Options. (line 374)
* fdump-rtl-loop2: Debugging Options. (line 415)
* fdump-rtl-lreg: Debugging Options. (line 411)
* fdump-rtl-mach: Debugging Options. (line 426)
* fdump-rtl-peephole2: Debugging Options. (line 481)
* fdump-rtl-postreload: Debugging Options. (line 439)
* fdump-rtl-regmove: Debugging Options. (line 435)
* fdump-rtl-rnreg: Debugging Options. (line 431)
* fdump-rtl-sched1: Debugging Options. (line 456)
* fdump-rtl-sched2: Debugging Options. (line 447)
* fdump-rtl-sibling: Debugging Options. (line 397)
* fdump-rtl-sms: Debugging Options. (line 422)
* fdump-rtl-stack: Debugging Options. (line 405)
* fdump-rtl-tracer: Debugging Options. (line 465)
* fdump-rtl-vartrack: Debugging Options. (line 470)
* fdump-rtl-vpt: Debugging Options. (line 470)
* fdump-rtl-web: Debugging Options. (line 485)
* fdump-translation-unit: Debugging Options. (line 534)
* fdump-tree: Debugging Options. (line 566)
* fdump-tree-alias: Debugging Options. (line 643)
* fdump-tree-all: Debugging Options. (line 727)
* fdump-tree-ccp: Debugging Options. (line 647)
* fdump-tree-cfg: Debugging Options. (line 618)
* fdump-tree-ch: Debugging Options. (line 630)
* fdump-tree-copyprop: Debugging Options. (line 663)
* fdump-tree-copyrename: Debugging Options. (line 708)
* fdump-tree-dce: Debugging Options. (line 671)
* fdump-tree-dom: Debugging Options. (line 689)
* fdump-tree-dse: Debugging Options. (line 694)
* fdump-tree-forwprop: Debugging Options. (line 703)
* fdump-tree-fre: Debugging Options. (line 659)
* fdump-tree-gimple: Debugging Options. (line 613)
* fdump-tree-mudflap: Debugging Options. (line 675)
* fdump-tree-nrv: Debugging Options. (line 713)
* fdump-tree-phiopt: Debugging Options. (line 698)
* fdump-tree-pre: Debugging Options. (line 655)
* fdump-tree-salias: Debugging Options. (line 638)
* fdump-tree-sink: Debugging Options. (line 685)
* fdump-tree-sra: Debugging Options. (line 680)
* fdump-tree-ssa: Debugging Options. (line 634)
* fdump-tree-storeccp: Debugging Options. (line 651)
* fdump-tree-store_copyprop: Debugging Options. (line 667)
* fdump-tree-vcg: Debugging Options. (line 622)
* fdump-tree-vect: Debugging Options. (line 718)
* fdump-tree-vrp: Debugging Options. (line 723)
* fdump-unnumbered: Debugging Options. (line 527)
* fearly-inlining: Optimize Options. (line 213)
* feliminate-dwarf2-dups: Debugging Options. (line 128)
* feliminate-unused-debug-symbols: Debugging Options. (line 52)
* feliminate-unused-debug-types: Debugging Options. (line 877)
* fexceptions: Code Gen Options. (line 34)
* fexec-charset: Preprocessor Options.
(line 499)
* fexpensive-optimizations: Optimize Options. (line 487)
* fextended-identifiers: Preprocessor Options.
(line 475)
* ffast-math: Optimize Options. (line 1182)
* ffinite-math-only: Optimize Options. (line 1257)
* ffix-and-continue: Darwin Options. (line 105)
* ffixed: Code Gen Options. (line 223)
* ffloat-store: Optimize Options. (line 1168)
* ffloat-store <1>: Disappointments. (line 77)
* ffor-scope: C++ Dialect Options.
(line 84)
* fforward-propagate: Optimize Options. (line 151)
* ffreestanding: Standards. (line 84)
* ffreestanding <1>: C Dialect Options. (line 212)
* ffreestanding <2>: Warning Options. (line 197)
* ffreestanding <3>: Function Attributes.
(line 398)
* ffriend-injection: C++ Dialect Options.
(line 55)
* ffunction-sections: Optimize Options. (line 1442)
* fgcse: Optimize Options. (line 389)
* fgcse-after-reload: Optimize Options. (line 425)
* fgcse-las: Optimize Options. (line 418)
* fgcse-lm: Optimize Options. (line 400)
* fgcse-sm: Optimize Options. (line 409)
* fgnu-runtime: Objective-C and Objective-C++ Dialect Options.
(line 39)
* fgnu89-inline: C Dialect Options. (line 120)
* fhosted: C Dialect Options. (line 204)
* fif-conversion: Optimize Options. (line 459)
* fif-conversion2: Optimize Options. (line 468)
* filelist: Darwin Options. (line 198)
* findirect-data: Darwin Options. (line 105)
* finhibit-size-directive: Code Gen Options. (line 146)
* finline-functions: Optimize Options. (line 194)
* finline-functions-called-once: Optimize Options. (line 205)
* finline-limit: Optimize Options. (line 222)
* finline-small-functions: Optimize Options. (line 186)
* finput-charset: Preprocessor Options.
(line 512)
* finstrument-functions: Code Gen Options. (line 279)
* finstrument-functions <1>: Function Attributes.
(line 658)
* finstrument-functions-exclude-file-list: Code Gen Options. (line 316)
* finstrument-functions-exclude-function-list: Code Gen Options.
(line 335)
* fipa-cp: Optimize Options. (line 669)
* fipa-matrix-reorg: Optimize Options. (line 678)
* fipa-pta: Optimize Options. (line 666)
* fipa-pure-const: Optimize Options. (line 643)
* fipa-reference: Optimize Options. (line 647)
* fipa-struct-reorg: Optimize Options. (line 651)
* fivopts: Optimize Options. (line 756)
* fkeep-inline-functions: Optimize Options. (line 247)
* fkeep-inline-functions <1>: Inline. (line 51)
* fkeep-static-consts: Optimize Options. (line 254)
* flat_namespace: Darwin Options. (line 198)
* flax-vector-conversions: C Dialect Options. (line 266)
* fleading-underscore: Code Gen Options. (line 394)
* fmem-report: Debugging Options. (line 234)
* fmerge-all-constants: Optimize Options. (line 273)
* fmerge-constants: Optimize Options. (line 263)
* fmerge-debug-strings: Debugging Options. (line 203)
* fmessage-length: Language Independent Options.
(line 15)
* fmodulo-sched: Optimize Options. (line 283)
* fmodulo-sched-allow-regmoves: Optimize Options. (line 288)
* fmove-loop-invariants: Optimize Options. (line 1432)
* fms-extensions: C Dialect Options. (line 232)
* fms-extensions <1>: C++ Dialect Options.
(line 119)
* fms-extensions <2>: Unnamed Fields. (line 37)
* fmudflap: Optimize Options. (line 328)
* fmudflapir: Optimize Options. (line 328)
* fmudflapth: Optimize Options. (line 328)
* fnext-runtime: Objective-C and Objective-C++ Dialect Options.
(line 43)
* fno-access-control: C++ Dialect Options.
(line 29)
* fno-asm: C Dialect Options. (line 156)
* fno-branch-count-reg: Optimize Options. (line 295)
* fno-builtin: C Dialect Options. (line 170)
* fno-builtin <1>: Warning Options. (line 197)
* fno-builtin <2>: Function Attributes.
(line 398)
* fno-builtin <3>: Other Builtins. (line 14)
* fno-common: Code Gen Options. (line 134)
* fno-common <1>: Variable Attributes.
(line 99)
* fno-default-inline: C++ Dialect Options.
(line 260)
* fno-default-inline <1>: Optimize Options. (line 135)
* fno-default-inline <2>: Inline. (line 71)
* fno-defer-pop: Optimize Options. (line 143)
* fno-elide-constructors: C++ Dialect Options.
(line 68)
* fno-enforce-eh-specs: C++ Dialect Options.
(line 74)
* fno-for-scope: C++ Dialect Options.
(line 84)
* fno-function-cse: Optimize Options. (line 305)
* fno-gnu-keywords: C++ Dialect Options.
(line 96)
* fno-guess-branch-probability: Optimize Options. (line 879)
* fno-ident: Code Gen Options. (line 143)
* fno-implement-inlines: C++ Dialect Options.
(line 113)
* fno-implement-inlines <1>: C++ Interface. (line 75)
* fno-implicit-inline-templates: C++ Dialect Options.
(line 107)
* fno-implicit-templates: C++ Dialect Options.
(line 101)
* fno-implicit-templates <1>: Template Instantiation.
(line 87)
* fno-inline: Optimize Options. (line 180)
* fno-jump-tables: Code Gen Options. (line 215)
* fno-math-errno: Optimize Options. (line 1196)
* fno-merge-debug-strings: Debugging Options. (line 203)
* fno-nil-receivers: Objective-C and Objective-C++ Dialect Options.
(line 49)
* fno-nonansi-builtins: C++ Dialect Options.
(line 124)
* fno-operator-names: C++ Dialect Options.
(line 129)
* fno-optional-diags: C++ Dialect Options.
(line 133)
* fno-peephole: Optimize Options. (line 870)
* fno-peephole2: Optimize Options. (line 870)
* fno-rtti: C++ Dialect Options.
(line 148)
* fno-sched-interblock: Optimize Options. (line 531)
* fno-sched-spec: Optimize Options. (line 536)
* fno-show-column: Preprocessor Options.
(line 536)
* fno-signed-bitfields: C Dialect Options. (line 299)
* fno-signed-zeros: Optimize Options. (line 1269)
* fno-stack-limit: Code Gen Options. (line 360)
* fno-threadsafe-statics: C++ Dialect Options.
(line 170)
* fno-toplevel-reorder: Optimize Options. (line 1101)
* fno-trapping-math: Optimize Options. (line 1279)
* fno-unsigned-bitfields: C Dialect Options. (line 299)
* fno-use-cxa-get-exception-ptr: C++ Dialect Options.
(line 183)
* fno-weak: C++ Dialect Options.
(line 245)
* fno-working-directory: Preprocessor Options.
(line 522)
* fno-zero-initialized-in-bss: Optimize Options. (line 316)
* fnon-call-exceptions: Code Gen Options. (line 48)
* fobjc-call-cxx-cdtors: Objective-C and Objective-C++ Dialect Options.
(line 56)
* fobjc-direct-dispatch: Objective-C and Objective-C++ Dialect Options.
(line 81)
* fobjc-exceptions: Objective-C and Objective-C++ Dialect Options.
(line 85)
* fobjc-gc: Objective-C and Objective-C++ Dialect Options.
(line 170)
* fomit-frame-pointer: Optimize Options. (line 160)
* fopenmp: C Dialect Options. (line 223)
* foptimize-register-move: Optimize Options. (line 494)
* foptimize-sibling-calls: Optimize Options. (line 175)
* force_cpusubtype_ALL: Darwin Options. (line 136)
* force_flat_namespace: Darwin Options. (line 198)
* fpack-struct: Code Gen Options. (line 266)
* fpcc-struct-return: Code Gen Options. (line 69)
* fpcc-struct-return <1>: Incompatibilities. (line 170)
* fpch-deps: Preprocessor Options.
(line 286)
* fpch-preprocess: Preprocessor Options.
(line 294)
* fpeel-loops: Optimize Options. (line 1424)
* fpermissive: C++ Dialect Options.
(line 138)
* fpic: Code Gen Options. (line 172)
* fPIC: Code Gen Options. (line 193)
* fpie: Code Gen Options. (line 206)
* fPIE: Code Gen Options. (line 206)
* fpost-ipa-mem-report: Debugging Options. (line 239)
* fpre-ipa-mem-report: Debugging Options. (line 238)
* fpredictive-commoning: Optimize Options. (line 852)
* fprefetch-loop-arrays: Optimize Options. (line 859)
* fpreprocessed: Preprocessor Options.
(line 480)
* fprofile-arcs: Debugging Options. (line 243)
* fprofile-arcs <1>: Other Builtins. (line 239)
* fprofile-generate: Optimize Options. (line 1142)
* fprofile-use: Optimize Options. (line 1152)
* fprofile-values: Optimize Options. (line 1372)
* frandom-string: Debugging Options. (line 755)
* freciprocal-math: Optimize Options. (line 1247)
* frecord-gcc-switches: Code Gen Options. (line 162)
* freg-struct-return: Code Gen Options. (line 87)
* fregmove: Optimize Options. (line 494)
* frename-registers: Optimize Options. (line 1391)
* freorder-blocks: Optimize Options. (line 896)
* freorder-blocks-and-partition: Optimize Options. (line 902)
* freorder-functions: Optimize Options. (line 913)
* freplace-objc-classes: Objective-C and Objective-C++ Dialect Options.
(line 174)
* frepo: C++ Dialect Options.
(line 143)
* frepo <1>: Template Instantiation.
(line 62)
* frerun-cse-after-loop: Optimize Options. (line 383)
* freschedule-modulo-scheduled-loops: Optimize Options. (line 600)
* frounding-math: Optimize Options. (line 1294)
* frtl-abstract-sequences: Optimize Options. (line 1314)
* fsched-spec-load: Optimize Options. (line 541)
* fsched-spec-load-dangerous: Optimize Options. (line 546)
* fsched-stalled-insns: Optimize Options. (line 552)
* fsched-stalled-insns-dep: Optimize Options. (line 562)
* fsched-verbose: Debugging Options. (line 765)
* fsched2-use-superblocks: Optimize Options. (line 572)
* fsched2-use-traces: Optimize Options. (line 583)
* fschedule-insns: Optimize Options. (line 512)
* fschedule-insns2: Optimize Options. (line 522)
* fsection-anchors: Optimize Options. (line 1487)
* fsee: Optimize Options. (line 595)
* fshort-double: Code Gen Options. (line 116)
* fshort-enums: Code Gen Options. (line 105)
* fshort-enums <1>: Structures unions enumerations and bit-fields implementation.
(line 43)
* fshort-enums <2>: Type Attributes. (line 113)
* fshort-enums <3>: Non-bugs. (line 42)
* fshort-wchar: Code Gen Options. (line 124)
* fsignaling-nans: Optimize Options. (line 1321)
* fsigned-bitfields: C Dialect Options. (line 299)
* fsigned-bitfields <1>: Non-bugs. (line 57)
* fsigned-char: C Dialect Options. (line 289)
* fsigned-char <1>: Characters implementation.
(line 31)
* fsingle-precision-constant: Optimize Options. (line 1336)
* fsplit-ivs-in-unroller: Optimize Options. (line 833)
* fsplit-wide-types: Optimize Options. (line 358)
* fstack-check: Code Gen Options. (line 345)
* fstack-limit-register: Code Gen Options. (line 360)
* fstack-limit-symbol: Code Gen Options. (line 360)
* fstack-protector: Optimize Options. (line 1475)
* fstack-protector-all: Optimize Options. (line 1484)
* fstats: C++ Dialect Options.
(line 158)
* fstrict-aliasing: Optimize Options. (line 926)
* fstrict-overflow: Optimize Options. (line 972)
* fsyntax-only: Warning Options. (line 14)
* ftabstop: Preprocessor Options.
(line 493)
* ftemplate-depth: C++ Dialect Options.
(line 163)
* ftest-coverage: Debugging Options. (line 298)
* fthread-jumps: Optimize Options. (line 349)
* ftime-report: Debugging Options. (line 230)
* ftls-model: Code Gen Options. (line 405)
* ftracer: Optimize Options. (line 816)
* ftracer <1>: Optimize Options. (line 1401)
* ftrapv: Code Gen Options. (line 22)
* ftree-ccp: Optimize Options. (line 692)
* ftree-ch: Optimize Options. (line 721)
* ftree-copy-prop: Optimize Options. (line 634)
* ftree-copyrename: Optimize Options. (line 776)
* ftree-dce: Optimize Options. (line 703)
* ftree-dominator-opts: Optimize Options. (line 707)
* ftree-dse: Optimize Options. (line 714)
* ftree-fre: Optimize Options. (line 627)
* ftree-loop-im: Optimize Options. (line 741)
* ftree-loop-ivcanon: Optimize Options. (line 750)
* ftree-loop-linear: Optimize Options. (line 732)
* ftree-loop-optimize: Optimize Options. (line 728)
* ftree-parallelize-loops: Optimize Options. (line 761)
* ftree-pre: Optimize Options. (line 623)
* ftree-reassoc: Optimize Options. (line 619)
* ftree-salias: Optimize Options. (line 639)
* ftree-sink: Optimize Options. (line 688)
* ftree-sra: Optimize Options. (line 770)
* ftree-store-ccp: Optimize Options. (line 697)
* ftree-ter: Optimize Options. (line 783)
* ftree-vect-loop-version: Optimize Options. (line 795)
* ftree-vectorize: Optimize Options. (line 791)
* ftree-vectorizer-verbose: Debugging Options. (line 731)
* ftree-vrp: Optimize Options. (line 807)
* funit-at-a-time: Optimize Options. (line 1070)
* funroll-all-loops: Optimize Options. (line 827)
* funroll-all-loops <1>: Optimize Options. (line 1418)
* funroll-loops: Optimize Options. (line 821)
* funroll-loops <1>: Optimize Options. (line 1408)
* funsafe-loop-optimizations: Optimize Options. (line 430)
* funsafe-math-optimizations: Optimize Options. (line 1214)
* funsigned-bitfields: C Dialect Options. (line 299)
* funsigned-bitfields <1>: Structures unions enumerations and bit-fields implementation.
(line 17)
* funsigned-bitfields <2>: Non-bugs. (line 57)
* funsigned-char: C Dialect Options. (line 271)
* funsigned-char <1>: Characters implementation.
(line 31)
* funswitch-loops: Optimize Options. (line 1436)
* funwind-tables: Code Gen Options. (line 56)
* fuse-cxa-atexit: C++ Dialect Options.
(line 176)
* fvar-tracking: Debugging Options. (line 808)
* fvariable-expansion-in-unroller: Optimize Options. (line 847)
* fvect-cost-model: Optimize Options. (line 804)
* fverbose-asm: Code Gen Options. (line 153)
* fvisibility: Code Gen Options. (line 413)
* fvisibility-inlines-hidden: C++ Dialect Options.
(line 188)
* fvisibility-ms-compat: C++ Dialect Options.
(line 216)
* fvpt: Optimize Options. (line 1382)
* fweb: Optimize Options. (line 1109)
* fwhole-program: Optimize Options. (line 1120)
* fwide-exec-charset: Preprocessor Options.
(line 504)
* fworking-directory: Preprocessor Options.
(line 522)
* fwrapv: Code Gen Options. (line 26)
* fzero-link: Objective-C and Objective-C++ Dialect Options.
(line 184)
* g: Debugging Options. (line 10)
* G: M32R/D Options. (line 57)
* G <1>: MIPS Options. (line 295)
* G <2>: RS/6000 and PowerPC Options.
(line 626)
* G <3>: System V Options. (line 10)
* gcoff: Debugging Options. (line 70)
* gdwarf-2: Debugging Options. (line 88)
* gen-decls: Objective-C and Objective-C++ Dialect Options.
(line 194)
* gfull: Darwin Options. (line 70)
* ggdb: Debugging Options. (line 38)
* gnu-ld: HPPA Options. (line 112)
* gstabs: Debugging Options. (line 44)
* gstabs+: Debugging Options. (line 64)
* gused: Darwin Options. (line 65)
* gvms: Debugging Options. (line 95)
* gxcoff: Debugging Options. (line 75)
* gxcoff+: Debugging Options. (line 80)
* H: Preprocessor Options.
(line 646)
* headerpad_max_install_names: Darwin Options. (line 198)
* help: Overall Options. (line 227)
* help <1>: Preprocessor Options.
(line 638)
* hp-ld: HPPA Options. (line 124)
* I: Preprocessor Options.
(line 64)
* I <1>: Directory Options. (line 10)
* I-: Preprocessor Options.
(line 367)
* I- <1>: Directory Options. (line 104)
* idirafter: Preprocessor Options.
(line 409)
* iframework: Darwin Options. (line 58)
* imacros: Preprocessor Options.
(line 400)
* image_base: Darwin Options. (line 198)
* imultilib: Preprocessor Options.
(line 432)
* include: Preprocessor Options.
(line 389)
* init: Darwin Options. (line 198)
* install_name: Darwin Options. (line 198)
* iprefix: Preprocessor Options.
(line 416)
* iquote: Preprocessor Options.
(line 444)
* iquote <1>: Directory Options. (line 29)
* isysroot: Preprocessor Options.
(line 428)
* isystem: Preprocessor Options.
(line 436)
* iwithprefix: Preprocessor Options.
(line 422)
* iwithprefixbefore: Preprocessor Options.
(line 422)
* keep_private_externs: Darwin Options. (line 198)
* l: Link Options. (line 26)
* L: Directory Options. (line 35)
* lobjc: Link Options. (line 53)
* M: Preprocessor Options.
(line 175)
* m1: SH Options. (line 9)
* m10: PDP-11 Options. (line 29)
* m128bit-long-double: i386 and x86-64 Options.
(line 234)
* m16-bit: CRIS Options. (line 69)
* m2: SH Options. (line 12)
* m210: MCore Options. (line 43)
* m3: SH Options. (line 18)
* m31: S/390 and zSeries Options.
(line 86)
* m32: i386 and x86-64 Options.
(line 548)
* m32 <1>: RS/6000 and PowerPC Options.
(line 243)
* m32 <2>: SPARC Options. (line 190)
* m32-bit: CRIS Options. (line 69)
* m32r: M32R/D Options. (line 15)
* m32r2: M32R/D Options. (line 9)
* m32rx: M32R/D Options. (line 12)
* m340: MCore Options. (line 43)
* m3dnow: i386 and x86-64 Options.
(line 398)
* m3e: SH Options. (line 21)
* m4: SH Options. (line 35)
* m4-nofpu: SH Options. (line 24)
* m4-single: SH Options. (line 31)
* m4-single-only: SH Options. (line 27)
* m40: PDP-11 Options. (line 23)
* m45: PDP-11 Options. (line 26)
* m4a: SH Options. (line 50)
* m4a-nofpu: SH Options. (line 38)
* m4a-single: SH Options. (line 46)
* m4a-single-only: SH Options. (line 42)
* m4al: SH Options. (line 53)
* m4byte-functions: MCore Options. (line 27)
* m5200: M680x0 Options. (line 141)
* m5206e: M680x0 Options. (line 150)
* m528x: M680x0 Options. (line 154)
* m5307: M680x0 Options. (line 158)
* m5407: M680x0 Options. (line 162)
* m64: i386 and x86-64 Options.
(line 548)
* m64 <1>: RS/6000 and PowerPC Options.
(line 243)
* m64 <2>: S/390 and zSeries Options.
(line 86)
* m64 <3>: SPARC Options. (line 190)
* m68000: M680x0 Options. (line 90)
* m68010: M680x0 Options. (line 98)
* m68020: M680x0 Options. (line 104)
* m68020-40: M680x0 Options. (line 172)
* m68020-60: M680x0 Options. (line 181)
* m68030: M680x0 Options. (line 109)
* m68040: M680x0 Options. (line 114)
* m68060: M680x0 Options. (line 123)
* m6811: M68hc1x Options. (line 13)
* m6812: M68hc1x Options. (line 18)
* m68881: M680x0 Options. (line 191)
* m68hc11: M68hc1x Options. (line 13)
* m68hc12: M68hc1x Options. (line 18)
* m68hcs12: M68hc1x Options. (line 23)
* m68S12: M68hc1x Options. (line 23)
* m8-bit: CRIS Options. (line 69)
* m96bit-long-double: i386 and x86-64 Options.
(line 234)
* mabi: ARM Options. (line 10)
* mabi <1>: RS/6000 and PowerPC Options.
(line 509)
* mabi-mmixware: MMIX Options. (line 20)
* mabi=32: MIPS Options. (line 120)
* mabi=64: MIPS Options. (line 120)
* mabi=eabi: MIPS Options. (line 120)
* mabi=gnu: MMIX Options. (line 20)
* mabi=ibmlongdouble: RS/6000 and PowerPC Options.
(line 522)
* mabi=ieeelongdouble: RS/6000 and PowerPC Options.
(line 526)
* mabi=n32: MIPS Options. (line 120)
* mabi=no-spe: RS/6000 and PowerPC Options.
(line 519)
* mabi=o64: MIPS Options. (line 120)
* mabi=spe: RS/6000 and PowerPC Options.
(line 514)
* mabicalls: MIPS Options. (line 144)
* mabort-on-noreturn: ARM Options. (line 147)
* mabshi: PDP-11 Options. (line 55)
* mac0: PDP-11 Options. (line 16)
* macc-4: FRV Options. (line 139)
* macc-8: FRV Options. (line 143)
* maccumulate-outgoing-args: i386 and x86-64 Options.
(line 480)
* madjust-unroll: SH Options. (line 186)
* mads: RS/6000 and PowerPC Options.
(line 552)
* maix-struct-return: RS/6000 and PowerPC Options.
(line 502)
* maix32: RS/6000 and PowerPC Options.
(line 281)
* maix64: RS/6000 and PowerPC Options.
(line 281)
* malign-300: H8/300 Options. (line 31)
* malign-double: i386 and x86-64 Options.
(line 219)
* malign-int: M680x0 Options. (line 260)
* malign-labels: FRV Options. (line 128)
* malign-loops: M32R/D Options. (line 73)
* malign-natural: RS/6000 and PowerPC Options.
(line 319)
* malign-power: RS/6000 and PowerPC Options.
(line 319)
* malloc-cc: FRV Options. (line 31)
* malpha-as: DEC Alpha Options. (line 159)
* maltivec: RS/6000 and PowerPC Options.
(line 181)
* mam33: MN10300 Options. (line 17)
* maout: CRIS Options. (line 91)
* mapcs: ARM Options. (line 22)
* mapcs-frame: ARM Options. (line 14)
* mapp-regs: SPARC Options. (line 10)
* mapp-regs <1>: V850 Options. (line 57)
* march: ARM Options. (line 111)
* march <1>: CRIS Options. (line 10)
* march <2>: HPPA Options. (line 9)
* march <3>: HPPA Options. (line 163)
* march <4>: i386 and x86-64 Options.
(line 120)
* march <5>: i386 and x86-64 Options.
(line 128)
* march <6>: M680x0 Options. (line 12)
* march <7>: MIPS Options. (line 14)
* march <8>: MT Options. (line 9)
* march <9>: S/390 and zSeries Options.
(line 114)
* masm=DIALECT: i386 and x86-64 Options.
(line 175)
* mauto-incdec: M68hc1x Options. (line 26)
* mauto-pic: IA-64 Options. (line 50)
* mb: SH Options. (line 58)
* mbacc: MT Options. (line 16)
* mbackchain: S/390 and zSeries Options.
(line 35)
* mbase-addresses: MMIX Options. (line 53)
* mbcopy: PDP-11 Options. (line 36)
* mbig: RS/6000 and PowerPC Options.
(line 434)
* mbig-endian: ARM Options. (line 72)
* mbig-endian <1>: IA-64 Options. (line 9)
* mbig-endian <2>: MCore Options. (line 39)
* mbig-endian <3>: RS/6000 and PowerPC Options.
(line 434)
* mbig-switch: HPPA Options. (line 23)
* mbig-switch <1>: V850 Options. (line 52)
* mbigtable: SH Options. (line 74)
* mbit-align: RS/6000 and PowerPC Options.
(line 388)
* mbitfield: M680x0 Options. (line 228)
* mbranch-cheap: PDP-11 Options. (line 65)
* mbranch-cost: MIPS Options. (line 511)
* mbranch-cost=NUMBER: M32R/D Options. (line 82)
* mbranch-expensive: PDP-11 Options. (line 61)
* mbranch-hints: SPU Options. (line 29)
* mbranch-likely: MIPS Options. (line 518)
* mbranch-predict: MMIX Options. (line 48)
* mbss-plt: RS/6000 and PowerPC Options.
(line 197)
* mbuild-constants: DEC Alpha Options. (line 142)
* mbwx: DEC Alpha Options. (line 171)
* mc68000: M680x0 Options. (line 90)
* mc68020: M680x0 Options. (line 104)
* mcall-gnu: RS/6000 and PowerPC Options.
(line 494)
* mcall-linux: RS/6000 and PowerPC Options.
(line 490)
* mcall-netbsd: RS/6000 and PowerPC Options.
(line 498)
* mcall-prologues: AVR Options. (line 43)
* mcall-solaris: RS/6000 and PowerPC Options.
(line 486)
* mcall-sysv: RS/6000 and PowerPC Options.
(line 473)
* mcall-sysv-eabi: RS/6000 and PowerPC Options.
(line 480)
* mcall-sysv-noeabi: RS/6000 and PowerPC Options.
(line 483)
* mcallee-super-interworking: ARM Options. (line 239)
* mcaller-super-interworking: ARM Options. (line 245)
* mcallgraph-data: MCore Options. (line 31)
* mcc-init: CRIS Options. (line 47)
* mcfv4e: M680x0 Options. (line 166)
* mcheck-zero-division: MIPS Options. (line 405)
* mcirrus-fix-invalid-insns: ARM Options. (line 190)
* mcix: DEC Alpha Options. (line 171)
* mcld: i386 and x86-64 Options.
(line 416)
* mcmodel=embmedany: SPARC Options. (line 212)
* mcmodel=kernel: i386 and x86-64 Options.
(line 570)
* mcmodel=large: i386 and x86-64 Options.
(line 582)
* mcmodel=medany: SPARC Options. (line 206)
* mcmodel=medium: i386 and x86-64 Options.
(line 575)
* mcmodel=medlow: SPARC Options. (line 195)
* mcmodel=medmid: SPARC Options. (line 200)
* mcmodel=small: i386 and x86-64 Options.
(line 564)
* mcmpb: RS/6000 and PowerPC Options.
(line 31)
* mcode-readable: MIPS Options. (line 365)
* mcond-exec: FRV Options. (line 187)
* mcond-move: FRV Options. (line 159)
* mconst-align: CRIS Options. (line 60)
* mconst16: Xtensa Options. (line 10)
* mconstant-gp: IA-64 Options. (line 46)
* mcpu: ARC Options. (line 23)
* mcpu <1>: ARM Options. (line 84)
* mcpu <2>: CRIS Options. (line 10)
* mcpu <3>: DEC Alpha Options. (line 223)
* mcpu <4>: FRV Options. (line 258)
* mcpu <5>: i386 and x86-64 Options.
(line 125)
* mcpu <6>: M680x0 Options. (line 28)
* mcpu <7>: RS/6000 and PowerPC Options.
(line 114)
* mcpu <8>: SPARC Options. (line 96)
* mcpu32: M680x0 Options. (line 132)
* mcpu=: Blackfin Options. (line 7)
* mcpu= <1>: M32C Options. (line 7)
* mcsync-anomaly: Blackfin Options. (line 54)
* mcx16: i386 and x86-64 Options.
(line 430)
* MD: Preprocessor Options.
(line 266)
* mdalign: SH Options. (line 64)
* mdata: ARC Options. (line 30)
* mdata-align: CRIS Options. (line 60)
* mdebug: M32R/D Options. (line 69)
* mdebug <1>: S/390 and zSeries Options.
(line 110)
* mdec-asm: PDP-11 Options. (line 78)
* mdisable-callt: V850 Options. (line 80)
* mdisable-fpregs: HPPA Options. (line 33)
* mdisable-indexing: HPPA Options. (line 40)
* mdiv: M680x0 Options. (line 203)
* mdiv <1>: MCore Options. (line 15)
* mdiv=STRATEGY: SH Options. (line 138)
* mdivide-breaks: MIPS Options. (line 411)
* mdivide-traps: MIPS Options. (line 411)
* mdivsi3_libfunc=NAME: SH Options. (line 179)
* mdlmzb: RS/6000 and PowerPC Options.
(line 382)
* mdmx: MIPS Options. (line 259)
* mdouble: FRV Options. (line 48)
* mdouble-float: MIPS Options. (line 217)
* mdsp: MIPS Options. (line 236)
* mdspr2: MIPS Options. (line 242)
* mdual-nops: SPU Options. (line 60)
* mdwarf2-asm: IA-64 Options. (line 79)
* mdword: FRV Options. (line 40)
* mdynamic-no-pic: RS/6000 and PowerPC Options.
(line 439)
* meabi: RS/6000 and PowerPC Options.
(line 575)
* mearly-stop-bits: IA-64 Options. (line 85)
* meb: Score Options. (line 9)
* mel: Score Options. (line 12)
* melf: CRIS Options. (line 94)
* melf <1>: MMIX Options. (line 43)
* melinux: CRIS Options. (line 98)
* melinux-stacksize: CRIS Options. (line 26)
* memb: RS/6000 and PowerPC Options.
(line 570)
* membedded-data: MIPS Options. (line 352)
* memregs=: M32C Options. (line 21)
* mep: V850 Options. (line 16)
* mepsilon: MMIX Options. (line 15)
* merror-reloc: SPU Options. (line 10)
* mesa: S/390 and zSeries Options.
(line 94)
* metrax100: CRIS Options. (line 32)
* metrax4: CRIS Options. (line 32)
* mexplicit-relocs: DEC Alpha Options. (line 184)
* mexplicit-relocs <1>: MIPS Options. (line 396)
* mextern-sdata: MIPS Options. (line 315)
* MF: Preprocessor Options.
(line 210)
* mfast-fp: Blackfin Options. (line 127)
* mfast-indirect-calls: HPPA Options. (line 52)
* mfaster-structs: SPARC Options. (line 71)
* mfdpic: FRV Options. (line 72)
* mfix: DEC Alpha Options. (line 171)
* mfix-and-continue: Darwin Options. (line 105)
* mfix-r4000: MIPS Options. (line 460)
* mfix-r4400: MIPS Options. (line 470)
* mfix-sb1: MIPS Options. (line 496)
* mfix-vr4120: MIPS Options. (line 476)
* mfix-vr4130: MIPS Options. (line 489)
* mfixed-cc: FRV Options. (line 35)
* mfixed-range: HPPA Options. (line 59)
* mfixed-range <1>: IA-64 Options. (line 90)
* mfixed-range <2>: SPU Options. (line 52)
* mflip-mips16: MIPS Options. (line 100)
* mfloat-abi: ARM Options. (line 59)
* mfloat-gprs: RS/6000 and PowerPC Options.
(line 226)
* mfloat-ieee: DEC Alpha Options. (line 179)
* mfloat-vax: DEC Alpha Options. (line 179)
* mfloat32: PDP-11 Options. (line 52)
* mfloat64: PDP-11 Options. (line 48)
* mflush-func: MIPS Options. (line 502)
* mflush-func=NAME: M32R/D Options. (line 94)
* mflush-trap=NUMBER: M32R/D Options. (line 87)
* mfmovd: SH Options. (line 78)
* mfp: ARM Options. (line 123)
* mfp-exceptions: MIPS Options. (line 529)
* mfp-reg: DEC Alpha Options. (line 25)
* mfp-rounding-mode: DEC Alpha Options. (line 85)
* mfp-trap-mode: DEC Alpha Options. (line 63)
* mfp32: MIPS Options. (line 200)
* mfp64: MIPS Options. (line 203)
* mfpe: ARM Options. (line 123)
* mfpr-32: FRV Options. (line 15)
* mfpr-64: FRV Options. (line 19)
* mfprnd: RS/6000 and PowerPC Options.
(line 31)
* mfpu: ARM Options. (line 123)
* mfpu <1>: PDP-11 Options. (line 9)
* mfpu <2>: SPARC Options. (line 20)
* mfull-toc: RS/6000 and PowerPC Options.
(line 254)
* mfused-madd: i386 and x86-64 Options.
(line 537)
* mfused-madd <1>: MIPS Options. (line 445)
* mfused-madd <2>: RS/6000 and PowerPC Options.
(line 369)
* mfused-madd <3>: S/390 and zSeries Options.
(line 135)
* mfused-madd <4>: Xtensa Options. (line 19)
* MG: Preprocessor Options.
(line 219)
* mg: VAX Options. (line 17)
* mgas: DEC Alpha Options. (line 159)
* mgas <1>: HPPA Options. (line 75)
* mgettrcost=NUMBER: SH Options. (line 201)
* mglibc: GNU/Linux Options. (line 9)
* mgnu: VAX Options. (line 13)
* mgnu-as: IA-64 Options. (line 18)
* mgnu-ld: IA-64 Options. (line 23)
* mgotplt: CRIS Options. (line 85)
* mgp32: MIPS Options. (line 194)
* mgp64: MIPS Options. (line 197)
* mgpopt: MIPS Options. (line 337)
* mgpr-32: FRV Options. (line 7)
* mgpr-64: FRV Options. (line 11)
* mgprel-ro: FRV Options. (line 99)
* mh: H8/300 Options. (line 14)
* mhard-dfp: RS/6000 and PowerPC Options.
(line 31)
* mhard-dfp <1>: S/390 and zSeries Options.
(line 20)
* mhard-float: ARM Options. (line 41)
* mhard-float <1>: FRV Options. (line 23)
* mhard-float <2>: M680x0 Options. (line 191)
* mhard-float <3>: MIPS Options. (line 206)
* mhard-float <4>: RS/6000 and PowerPC Options.
(line 331)
* mhard-float <5>: S/390 and zSeries Options.
(line 11)
* mhard-float <6>: SPARC Options. (line 20)
* mhard-quad-float: SPARC Options. (line 41)
* mhardlit: MCore Options. (line 10)
* mhint-max-distance: SPU Options. (line 72)
* mhint-max-nops: SPU Options. (line 66)
* mhitachi: SH Options. (line 81)
* mhitachi <1>: SH Options. (line 84)
* mhitachi <2>: SH Options. (line 87)
* mid-shared-library: Blackfin Options. (line 75)
* mieee: DEC Alpha Options. (line 39)
* mieee <1>: SH Options. (line 96)
* mieee-conformant: DEC Alpha Options. (line 134)
* mieee-fp: i386 and x86-64 Options.
(line 181)
* mieee-with-inexact: DEC Alpha Options. (line 52)
* milp32: IA-64 Options. (line 114)
* mimpure-text: SPARC Options. (line 81)
* mindexed-addressing: SH Options. (line 191)
* minit-stack: AVR Options. (line 35)
* minline-all-stringops: i386 and x86-64 Options.
(line 501)
* minline-float-divide-max-throughput: IA-64 Options. (line 58)
* minline-float-divide-min-latency: IA-64 Options. (line 54)
* minline-ic_invalidate: SH Options. (line 103)
* minline-int-divide-max-throughput: IA-64 Options. (line 66)
* minline-int-divide-min-latency: IA-64 Options. (line 62)
* minline-plt: Blackfin Options. (line 132)
* minline-plt <1>: FRV Options. (line 81)
* minline-sqrt-max-throughput: IA-64 Options. (line 74)
* minline-sqrt-min-latency: IA-64 Options. (line 70)
* minline-stringops-dynamically: i386 and x86-64 Options.
(line 507)
* minmax: M68hc1x Options. (line 31)
* minsert-sched-nops: RS/6000 and PowerPC Options.
(line 461)
* mint16: PDP-11 Options. (line 40)
* mint32: H8/300 Options. (line 28)
* mint32 <1>: PDP-11 Options. (line 44)
* mint8: AVR Options. (line 53)
* minterlink-mips16: MIPS Options. (line 107)
* minvalid-symbols: SH Options. (line 224)
* mips1: MIPS Options. (line 70)
* mips16: MIPS Options. (line 92)
* mips2: MIPS Options. (line 73)
* mips3: MIPS Options. (line 76)
* mips32: MIPS Options. (line 82)
* mips32r2: MIPS Options. (line 85)
* mips3d: MIPS Options. (line 265)
* mips4: MIPS Options. (line 79)
* mips64: MIPS Options. (line 88)
* misel: RS/6000 and PowerPC Options.
(line 203)
* misize: SH Options. (line 115)
* missue-rate=NUMBER: M32R/D Options. (line 79)
* mjump-in-delay: HPPA Options. (line 28)
* mkernel: Darwin Options. (line 83)
* mknuthdiv: MMIX Options. (line 32)
* ml: SH Options. (line 61)
* mlarge-data: DEC Alpha Options. (line 195)
* mlarge-data-threshold=NUMBER: i386 and x86-64 Options.
(line 260)
* mlarge-mem: SPU Options. (line 38)
* mlarge-text: DEC Alpha Options. (line 213)
* mleaf-id-shared-library: Blackfin Options. (line 86)
* mlibfuncs: MMIX Options. (line 10)
* mlibrary-pic: FRV Options. (line 135)
* mlinked-fp: FRV Options. (line 116)
* mlinker-opt: HPPA Options. (line 85)
* mlinux: CRIS Options. (line 103)
* mlittle: RS/6000 and PowerPC Options.
(line 428)
* mlittle-endian: ARM Options. (line 68)
* mlittle-endian <1>: IA-64 Options. (line 13)
* mlittle-endian <2>: MCore Options. (line 39)
* mlittle-endian <3>: RS/6000 and PowerPC Options.
(line 428)
* mlittle-endian <4>: SPARC Options. (line 184)
* mllsc: MIPS Options. (line 222)
* mlocal-sdata: MIPS Options. (line 303)
* mlong-calls: ARM Options. (line 152)
* mlong-calls <1>: Blackfin Options. (line 115)
* mlong-calls <2>: FRV Options. (line 122)
* mlong-calls <3>: M68hc1x Options. (line 35)
* mlong-calls <4>: MIPS Options. (line 431)
* mlong-calls <5>: V850 Options. (line 10)
* mlong-double-128: S/390 and zSeries Options.
(line 29)
* mlong-double-64: S/390 and zSeries Options.
(line 29)
* mlong-load-store: HPPA Options. (line 66)
* mlong32: MIPS Options. (line 278)
* mlong64: MIPS Options. (line 273)
* mlongcall: RS/6000 and PowerPC Options.
(line 640)
* mlongcalls: Xtensa Options. (line 60)
* mlow-64k: Blackfin Options. (line 64)
* mlp64: IA-64 Options. (line 114)
* MM: Preprocessor Options.
(line 200)
* mmac: CRX Options. (line 9)
* mmac <1>: Score Options. (line 21)
* mmad: MIPS Options. (line 440)
* mmangle-cpu: ARC Options. (line 15)
* mmax: DEC Alpha Options. (line 171)
* mmax-stack-frame: CRIS Options. (line 23)
* mmcu: AVR Options. (line 9)
* MMD: Preprocessor Options.
(line 282)
* mmedia: FRV Options. (line 56)
* mmemcpy: MIPS Options. (line 425)
* mmemory-latency: DEC Alpha Options. (line 266)
* mmfcrf: RS/6000 and PowerPC Options.
(line 31)
* mmfpgpr: RS/6000 and PowerPC Options.
(line 31)
* mminimal-toc: RS/6000 and PowerPC Options.
(line 254)
* mmmx: i386 and x86-64 Options.
(line 398)
* mmodel=large: M32R/D Options. (line 33)
* mmodel=medium: M32R/D Options. (line 27)
* mmodel=small: M32R/D Options. (line 18)
* mmt: MIPS Options. (line 270)
* mmul-bug-workaround: CRIS Options. (line 37)
* mmuladd: FRV Options. (line 64)
* mmulhw: RS/6000 and PowerPC Options.
(line 375)
* mmult-bug: MN10300 Options. (line 9)
* mmulti-cond-exec: FRV Options. (line 215)
* mmultiple: RS/6000 and PowerPC Options.
(line 337)
* mmvcle: S/390 and zSeries Options.
(line 104)
* mmvme: RS/6000 and PowerPC Options.
(line 547)
* mn: H8/300 Options. (line 20)
* mnested-cond-exec: FRV Options. (line 230)
* mnew-mnemonics: RS/6000 and PowerPC Options.
(line 99)
* mnhwloop: Score Options. (line 15)
* mno-3dnow: i386 and x86-64 Options.
(line 398)
* mno-4byte-functions: MCore Options. (line 27)
* mno-abicalls: MIPS Options. (line 144)
* mno-abshi: PDP-11 Options. (line 58)
* mno-ac0: PDP-11 Options. (line 20)
* mno-align-double: i386 and x86-64 Options.
(line 219)
* mno-align-int: M680x0 Options. (line 260)
* mno-align-loops: M32R/D Options. (line 76)
* mno-align-stringops: i386 and x86-64 Options.
(line 496)
* mno-altivec: RS/6000 and PowerPC Options.
(line 181)
* mno-am33: MN10300 Options. (line 20)
* mno-app-regs: SPARC Options. (line 10)
* mno-app-regs <1>: V850 Options. (line 61)
* mno-bacc: MT Options. (line 19)
* mno-backchain: S/390 and zSeries Options.
(line 35)
* mno-base-addresses: MMIX Options. (line 53)
* mno-bit-align: RS/6000 and PowerPC Options.
(line 388)
* mno-bitfield: M680x0 Options. (line 224)
* mno-branch-likely: MIPS Options. (line 518)
* mno-branch-predict: MMIX Options. (line 48)
* mno-bwx: DEC Alpha Options. (line 171)
* mno-callgraph-data: MCore Options. (line 31)
* mno-check-zero-division: MIPS Options. (line 405)
* mno-cirrus-fix-invalid-insns: ARM Options. (line 190)
* mno-cix: DEC Alpha Options. (line 171)
* mno-cmpb: RS/6000 and PowerPC Options.
(line 31)
* mno-cond-exec: FRV Options. (line 194)
* mno-cond-move: FRV Options. (line 166)
* mno-const-align: CRIS Options. (line 60)
* mno-const16: Xtensa Options. (line 10)
* mno-crt0: MN10300 Options. (line 31)
* mno-crt0 <1>: MT Options. (line 25)
* mno-csync-anomaly: Blackfin Options. (line 60)
* mno-data-align: CRIS Options. (line 60)
* mno-debug: S/390 and zSeries Options.
(line 110)
* mno-div: M680x0 Options. (line 203)
* mno-div <1>: MCore Options. (line 15)
* mno-dlmzb: RS/6000 and PowerPC Options.
(line 382)
* mno-double: FRV Options. (line 52)
* mno-dsp: MIPS Options. (line 236)
* mno-dspr2: MIPS Options. (line 242)
* mno-dwarf2-asm: IA-64 Options. (line 79)
* mno-dword: FRV Options. (line 44)
* mno-eabi: RS/6000 and PowerPC Options.
(line 575)
* mno-early-stop-bits: IA-64 Options. (line 85)
* mno-eflags: FRV Options. (line 155)
* mno-embedded-data: MIPS Options. (line 352)
* mno-ep: V850 Options. (line 16)
* mno-epsilon: MMIX Options. (line 15)
* mno-explicit-relocs: DEC Alpha Options. (line 184)
* mno-explicit-relocs <1>: MIPS Options. (line 396)
* mno-extern-sdata: MIPS Options. (line 315)
* mno-fancy-math-387: i386 and x86-64 Options.
(line 208)
* mno-faster-structs: SPARC Options. (line 71)
* mno-fix: DEC Alpha Options. (line 171)
* mno-fix-r4000: MIPS Options. (line 460)
* mno-fix-r4400: MIPS Options. (line 470)
* mno-float32: PDP-11 Options. (line 48)
* mno-float64: PDP-11 Options. (line 52)
* mno-flush-func: M32R/D Options. (line 99)
* mno-flush-trap: M32R/D Options. (line 91)
* mno-fp-in-toc: RS/6000 and PowerPC Options.
(line 254)
* mno-fp-regs: DEC Alpha Options. (line 25)
* mno-fp-ret-in-387: i386 and x86-64 Options.
(line 198)
* mno-fprnd: RS/6000 and PowerPC Options.
(line 31)
* mno-fpu: SPARC Options. (line 25)
* mno-fused-madd: MIPS Options. (line 445)
* mno-fused-madd <1>: RS/6000 and PowerPC Options.
(line 369)
* mno-fused-madd <2>: S/390 and zSeries Options.
(line 135)
* mno-fused-madd <3>: Xtensa Options. (line 19)
* mno-gnu-as: IA-64 Options. (line 18)
* mno-gnu-ld: IA-64 Options. (line 23)
* mno-gotplt: CRIS Options. (line 85)
* mno-gpopt: MIPS Options. (line 337)
* mno-hard-dfp: RS/6000 and PowerPC Options.
(line 31)
* mno-hard-dfp <1>: S/390 and zSeries Options.
(line 20)
* mno-hardlit: MCore Options. (line 10)
* mno-id-shared-library: Blackfin Options. (line 82)
* mno-ieee-fp: i386 and x86-64 Options.
(line 181)
* mno-int16: PDP-11 Options. (line 44)
* mno-int32: PDP-11 Options. (line 40)
* mno-interlink-mips16: MIPS Options. (line 107)
* mno-interrupts: AVR Options. (line 39)
* mno-isel: RS/6000 and PowerPC Options.
(line 203)
* mno-knuthdiv: MMIX Options. (line 32)
* mno-leaf-id-shared-library: Blackfin Options. (line 92)
* mno-libfuncs: MMIX Options. (line 10)
* mno-llsc: MIPS Options. (line 222)
* mno-local-sdata: MIPS Options. (line 303)
* mno-long-calls: ARM Options. (line 152)
* mno-long-calls <1>: Blackfin Options. (line 115)
* mno-long-calls <2>: HPPA Options. (line 137)
* mno-long-calls <3>: M68hc1x Options. (line 35)
* mno-long-calls <4>: MIPS Options. (line 431)
* mno-long-calls <5>: V850 Options. (line 10)
* mno-longcall: RS/6000 and PowerPC Options.
(line 640)
* mno-longcalls: Xtensa Options. (line 60)
* mno-low-64k: Blackfin Options. (line 68)
* mno-mad: MIPS Options. (line 440)
* mno-max: DEC Alpha Options. (line 171)
* mno-mdmx: MIPS Options. (line 259)
* mno-media: FRV Options. (line 60)
* mno-memcpy: MIPS Options. (line 425)
* mno-mfcrf: RS/6000 and PowerPC Options.
(line 31)
* mno-mfpgpr: RS/6000 and PowerPC Options.
(line 31)
* mno-mips16: MIPS Options. (line 92)
* mno-mips3d: MIPS Options. (line 265)
* mno-mmx: i386 and x86-64 Options.
(line 398)
* mno-mt: MIPS Options. (line 270)
* mno-mul-bug-workaround: CRIS Options. (line 37)
* mno-muladd: FRV Options. (line 68)
* mno-mulhw: RS/6000 and PowerPC Options.
(line 375)
* mno-mult-bug: MN10300 Options. (line 13)
* mno-multi-cond-exec: FRV Options. (line 223)
* mno-multiple: RS/6000 and PowerPC Options.
(line 337)
* mno-mvcle: S/390 and zSeries Options.
(line 104)
* mno-nested-cond-exec: FRV Options. (line 237)
* mno-optimize-membar: FRV Options. (line 249)
* mno-pack: FRV Options. (line 151)
* mno-packed-stack: S/390 and zSeries Options.
(line 54)
* mno-paired: RS/6000 and PowerPC Options.
(line 217)
* mno-paired-single: MIPS Options. (line 253)
* mno-pic: IA-64 Options. (line 26)
* mno-popcntb: RS/6000 and PowerPC Options.
(line 31)
* mno-power: RS/6000 and PowerPC Options.
(line 31)
* mno-power2: RS/6000 and PowerPC Options.
(line 31)
* mno-powerpc: RS/6000 and PowerPC Options.
(line 31)
* mno-powerpc-gfxopt: RS/6000 and PowerPC Options.
(line 31)
* mno-powerpc-gpopt: RS/6000 and PowerPC Options.
(line 31)
* mno-powerpc64: RS/6000 and PowerPC Options.
(line 31)
* mno-prolog-function: V850 Options. (line 23)
* mno-prologue-epilogue: CRIS Options. (line 76)
* mno-prototype: RS/6000 and PowerPC Options.
(line 531)
* mno-push-args: i386 and x86-64 Options.
(line 473)
* mno-register-names: IA-64 Options. (line 37)
* mno-regnames: RS/6000 and PowerPC Options.
(line 634)
* mno-relax-immediate: MCore Options. (line 19)
* mno-relocatable: RS/6000 and PowerPC Options.
(line 405)
* mno-relocatable-lib: RS/6000 and PowerPC Options.
(line 413)
* mno-rtd: M680x0 Options. (line 255)
* mno-scc: FRV Options. (line 180)
* mno-sched-ar-data-spec: IA-64 Options. (line 127)
* mno-sched-ar-in-data-spec: IA-64 Options. (line 147)
* mno-sched-br-data-spec: IA-64 Options. (line 121)
* mno-sched-br-in-data-spec: IA-64 Options. (line 140)
* mno-sched-control-ldc: IA-64 Options. (line 166)
* mno-sched-control-spec: IA-64 Options. (line 133)
* mno-sched-count-spec-in-critical-path: IA-64 Options. (line 192)
* mno-sched-in-control-spec: IA-64 Options. (line 154)
* mno-sched-ldc: IA-64 Options. (line 160)
* mno-sched-prefer-non-control-spec-insns: IA-64 Options. (line 185)
* mno-sched-prefer-non-data-spec-insns: IA-64 Options. (line 178)
* mno-sched-prolog: ARM Options. (line 32)
* mno-sched-spec-verbose: IA-64 Options. (line 174)
* mno-sdata: IA-64 Options. (line 42)
* mno-sdata <1>: RS/6000 and PowerPC Options.
(line 621)
* mno-sep-data: Blackfin Options. (line 110)
* mno-short: M680x0 Options. (line 219)
* mno-side-effects: CRIS Options. (line 51)
* mno-single-exit: MMIX Options. (line 65)
* mno-slow-bytes: MCore Options. (line 35)
* mno-small-exec: S/390 and zSeries Options.
(line 79)
* mno-smartmips: MIPS Options. (line 249)
* mno-soft-float: DEC Alpha Options. (line 10)
* mno-space-regs: HPPA Options. (line 45)
* mno-spe: RS/6000 and PowerPC Options.
(line 212)
* mno-specld-anomaly: Blackfin Options. (line 50)
* mno-split: PDP-11 Options. (line 71)
* mno-split-addresses: MIPS Options. (line 390)
* mno-sse: i386 and x86-64 Options.
(line 398)
* mno-stack-align: CRIS Options. (line 60)
* mno-stack-bias: SPARC Options. (line 220)
* mno-strict-align: M680x0 Options. (line 280)
* mno-strict-align <1>: RS/6000 and PowerPC Options.
(line 400)
* mno-string: RS/6000 and PowerPC Options.
(line 348)
* mno-sum-in-toc: RS/6000 and PowerPC Options.
(line 254)
* mno-swdiv: RS/6000 and PowerPC Options.
(line 171)
* mno-sym32: MIPS Options. (line 288)
* mno-tablejump: AVR Options. (line 47)
* mno-target-align: Xtensa Options. (line 47)
* mno-text-section-literals: Xtensa Options. (line 35)
* mno-toc: RS/6000 and PowerPC Options.
(line 422)
* mno-toplevel-symbols: MMIX Options. (line 39)
* mno-tpf-trace: S/390 and zSeries Options.
(line 129)
* mno-unaligned-doubles: SPARC Options. (line 59)
* mno-uninit-const-in-rodata: MIPS Options. (line 360)
* mno-update: RS/6000 and PowerPC Options.
(line 359)
* mno-v8plus: SPARC Options. (line 169)
* mno-vis: SPARC Options. (line 176)
* mno-vliw-branch: FRV Options. (line 208)
* mno-volatile-asm-stop: IA-64 Options. (line 32)
* mno-vrsave: RS/6000 and PowerPC Options.
(line 189)
* mno-wide-bitfields: MCore Options. (line 23)
* mno-xgot: MIPS Options. (line 171)
* mno-xl-compat: RS/6000 and PowerPC Options.
(line 289)
* mno-zero-extend: MMIX Options. (line 26)
* mnobitfield: M680x0 Options. (line 224)
* mnomacsave: SH Options. (line 92)
* mnominmax: M68hc1x Options. (line 31)
* mnop-fun-dllimport: ARM Options. (line 177)
* mold-mnemonics: RS/6000 and PowerPC Options.
(line 99)
* momit-leaf-frame-pointer: Blackfin Options. (line 38)
* momit-leaf-frame-pointer <1>: i386 and x86-64 Options.
(line 519)
* mone-byte-bool: Darwin Options. (line 91)
* moptimize-membar: FRV Options. (line 244)
* MP: Preprocessor Options.
(line 229)
* mpa-risc-1-0: HPPA Options. (line 19)
* mpa-risc-1-1: HPPA Options. (line 19)
* mpa-risc-2-0: HPPA Options. (line 19)
* mpack: FRV Options. (line 147)
* mpacked-stack: S/390 and zSeries Options.
(line 54)
* mpadstruct: SH Options. (line 118)
* mpaired: RS/6000 and PowerPC Options.
(line 217)
* mpaired-single: MIPS Options. (line 253)
* mpc32: i386 and x86-64 Options.
(line 313)
* mpc64: i386 and x86-64 Options.
(line 313)
* mpc80: i386 and x86-64 Options.
(line 313)
* mpcrel: M680x0 Options. (line 272)
* mpdebug: CRIS Options. (line 41)
* mpe: RS/6000 and PowerPC Options.
(line 308)
* mpic-register: ARM Options. (line 186)
* mpoke-function-name: ARM Options. (line 200)
* mpopcntb: RS/6000 and PowerPC Options.
(line 31)
* mportable-runtime: HPPA Options. (line 71)
* mpower: RS/6000 and PowerPC Options.
(line 31)
* mpower2: RS/6000 and PowerPC Options.
(line 31)
* mpowerpc: RS/6000 and PowerPC Options.
(line 31)
* mpowerpc-gfxopt: RS/6000 and PowerPC Options.
(line 31)
* mpowerpc-gpopt: RS/6000 and PowerPC Options.
(line 31)
* mpowerpc64: RS/6000 and PowerPC Options.
(line 31)
* mprefergot: SH Options. (line 125)
* mpreferred-stack-boundary: i386 and x86-64 Options.
(line 348)
* mprioritize-restricted-insns: RS/6000 and PowerPC Options.
(line 445)
* mprolog-function: V850 Options. (line 23)
* mprologue-epilogue: CRIS Options. (line 76)
* mprototype: RS/6000 and PowerPC Options.
(line 531)
* mpt-fixed: SH Options. (line 205)
* mpush-args: CRX Options. (line 13)
* mpush-args <1>: i386 and x86-64 Options.
(line 473)
* MQ: Preprocessor Options.
(line 256)
* mrecip: i386 and x86-64 Options.
(line 448)
* mregister-names: IA-64 Options. (line 37)
* mregnames: RS/6000 and PowerPC Options.
(line 634)
* mregparm: i386 and x86-64 Options.
(line 290)
* mrelax: H8/300 Options. (line 9)
* mrelax <1>: MN10300 Options. (line 34)
* mrelax <2>: SH Options. (line 70)
* mrelax-immediate: MCore Options. (line 19)
* mrelocatable: RS/6000 and PowerPC Options.
(line 405)
* mrelocatable-lib: RS/6000 and PowerPC Options.
(line 413)
* mreturn-pointer-on-d0: MN10300 Options. (line 24)
* mrodata: ARC Options. (line 30)
* mrtd: i386 and x86-64 Options.
(line 266)
* mrtd <1>: M680x0 Options. (line 233)
* mrtd <2>: Function Attributes.
(line 170)
* mrtp: VxWorks Options. (line 11)
* ms: H8/300 Options. (line 17)
* ms2600: H8/300 Options. (line 24)
* msafe-dma: SPU Options. (line 18)
* msafe-hints: SPU Options. (line 77)
* msahf: i386 and x86-64 Options.
(line 438)
* mscc: FRV Options. (line 173)
* msched-ar-data-spec: IA-64 Options. (line 127)
* msched-ar-in-data-spec: IA-64 Options. (line 147)
* msched-br-data-spec: IA-64 Options. (line 121)
* msched-br-in-data-spec: IA-64 Options. (line 140)
* msched-control-ldc: IA-64 Options. (line 166)
* msched-control-spec: IA-64 Options. (line 133)
* msched-costly-dep: RS/6000 and PowerPC Options.
(line 452)
* msched-count-spec-in-critical-path: IA-64 Options. (line 192)
* msched-in-control-spec: IA-64 Options. (line 154)
* msched-ldc: IA-64 Options. (line 160)
* msched-prefer-non-control-spec-insns: IA-64 Options. (line 185)
* msched-prefer-non-data-spec-insns: IA-64 Options. (line 178)
* msched-spec-verbose: IA-64 Options. (line 174)
* mschedule: HPPA Options. (line 78)
* mscore5: Score Options. (line 25)
* mscore5u: Score Options. (line 28)
* mscore7: Score Options. (line 31)
* mscore7d: Score Options. (line 35)
* msda: V850 Options. (line 40)
* msdata: IA-64 Options. (line 42)
* msdata <1>: RS/6000 and PowerPC Options.
(line 608)
* msdata-data: RS/6000 and PowerPC Options.
(line 613)
* msdata=default: RS/6000 and PowerPC Options.
(line 608)
* msdata=eabi: RS/6000 and PowerPC Options.
(line 589)
* msdata=none: M32R/D Options. (line 40)
* msdata=none <1>: RS/6000 and PowerPC Options.
(line 621)
* msdata=sdata: M32R/D Options. (line 49)
* msdata=sysv: RS/6000 and PowerPC Options.
(line 599)
* msdata=use: M32R/D Options. (line 53)
* msecure-plt: RS/6000 and PowerPC Options.
(line 192)
* msep-data: Blackfin Options. (line 104)
* mshared-library-id: Blackfin Options. (line 97)
* mshort: M680x0 Options. (line 213)
* mshort <1>: M68hc1x Options. (line 40)
* msim: Blackfin Options. (line 31)
* msim <1>: M32C Options. (line 13)
* msim <2>: MT Options. (line 22)
* msim <3>: RS/6000 and PowerPC Options.
(line 541)
* msim <4>: Xstormy16 Options. (line 9)
* msingle-exit: MMIX Options. (line 65)
* msingle-float: MIPS Options. (line 213)
* msingle-pic-base: ARM Options. (line 180)
* msio: HPPA Options. (line 106)
* msize: AVR Options. (line 32)
* mslow-bytes: MCore Options. (line 35)
* msmall-data: DEC Alpha Options. (line 195)
* msmall-exec: S/390 and zSeries Options.
(line 79)
* msmall-mem: SPU Options. (line 38)
* msmall-text: DEC Alpha Options. (line 213)
* msmartmips: MIPS Options. (line 249)
* msoft-float: ARM Options. (line 45)
* msoft-float <1>: DEC Alpha Options. (line 10)
* msoft-float <2>: FRV Options. (line 27)
* msoft-float <3>: HPPA Options. (line 91)
* msoft-float <4>: i386 and x86-64 Options.
(line 186)
* msoft-float <5>: M680x0 Options. (line 197)
* msoft-float <6>: MIPS Options. (line 209)
* msoft-float <7>: PDP-11 Options. (line 13)
* msoft-float <8>: RS/6000 and PowerPC Options.
(line 331)
* msoft-float <9>: S/390 and zSeries Options.
(line 11)
* msoft-float <10>: SPARC Options. (line 25)
* msoft-quad-float: SPARC Options. (line 45)
* msoft-reg-count: M68hc1x Options. (line 43)
* mspace: SH Options. (line 122)
* mspace <1>: V850 Options. (line 30)
* mspe: RS/6000 and PowerPC Options.
(line 212)
* mspecld-anomaly: Blackfin Options. (line 45)
* msplit: PDP-11 Options. (line 68)
* msplit-addresses: MIPS Options. (line 390)
* msse: i386 and x86-64 Options.
(line 398)
* msseregparm: i386 and x86-64 Options.
(line 301)
* mstack-align: CRIS Options. (line 60)
* mstack-bias: SPARC Options. (line 220)
* mstack-check-l1: Blackfin Options. (line 71)
* mstack-guard: S/390 and zSeries Options.
(line 154)
* mstack-size: S/390 and zSeries Options.
(line 154)
* mstackrealign: i386 and x86-64 Options.
(line 334)
* mstdmain: SPU Options. (line 44)
* mstrict-align: M680x0 Options. (line 280)
* mstrict-align <1>: RS/6000 and PowerPC Options.
(line 400)
* mstring: RS/6000 and PowerPC Options.
(line 348)
* mstringop-strategy=ALG: i386 and x86-64 Options.
(line 512)
* mstructure-size-boundary: ARM Options. (line 132)
* msvr4-struct-return: RS/6000 and PowerPC Options.
(line 505)
* mswdiv: RS/6000 and PowerPC Options.
(line 171)
* msym32: MIPS Options. (line 288)
* MT: Preprocessor Options.
(line 241)
* mt: IA-64 Options. (line 106)
* mtarget-align: Xtensa Options. (line 47)
* mtda: V850 Options. (line 34)
* mtext: ARC Options. (line 30)
* mtext-section-literals: Xtensa Options. (line 35)
* mthreads: i386 and x86-64 Options.
(line 488)
* mthumb: ARM Options. (line 221)
* mthumb-interwork: ARM Options. (line 25)
* mtiny-stack: AVR Options. (line 50)
* mtls-direct-seg-refs: i386 and x86-64 Options.
(line 527)
* mtls-size: IA-64 Options. (line 97)
* mtoc: RS/6000 and PowerPC Options.
(line 422)
* mtomcat-stats: FRV Options. (line 254)
* mtoplevel-symbols: MMIX Options. (line 39)
* mtp: ARM Options. (line 251)
* mtpcs-frame: ARM Options. (line 227)
* mtpcs-leaf-frame: ARM Options. (line 233)
* mtpf-trace: S/390 and zSeries Options.
(line 129)
* mtrap-precision: DEC Alpha Options. (line 109)
* mtune: ARM Options. (line 101)
* mtune <1>: CRIS Options. (line 17)
* mtune <2>: DEC Alpha Options. (line 262)
* mtune <3>: i386 and x86-64 Options.
(line 10)
* mtune <4>: IA-64 Options. (line 101)
* mtune <5>: M680x0 Options. (line 65)
* mtune <6>: MIPS Options. (line 55)
* mtune <7>: RS/6000 and PowerPC Options.
(line 161)
* mtune <8>: S/390 and zSeries Options.
(line 122)
* mtune <9>: SPARC Options. (line 157)
* muclibc: GNU/Linux Options. (line 13)
* muls: Score Options. (line 18)
* multcost=NUMBER: SH Options. (line 135)
* multilib-library-pic: FRV Options. (line 110)
* multiply_defined: Darwin Options. (line 198)
* multiply_defined_unused: Darwin Options. (line 198)
* multi_module: Darwin Options. (line 198)
* munaligned-doubles: SPARC Options. (line 59)
* muninit-const-in-rodata: MIPS Options. (line 360)
* munix: VAX Options. (line 9)
* munix-asm: PDP-11 Options. (line 74)
* munsafe-dma: SPU Options. (line 18)
* mupdate: RS/6000 and PowerPC Options.
(line 359)
* musermode: SH Options. (line 130)
* mv850: V850 Options. (line 49)
* mv850e: V850 Options. (line 69)
* mv850e1: V850 Options. (line 64)
* mv8plus: SPARC Options. (line 169)
* mveclibabi: i386 and x86-64 Options.
(line 461)
* mvis: SPARC Options. (line 176)
* mvliw-branch: FRV Options. (line 201)
* mvms-return-codes: DEC Alpha/VMS Options.
(line 9)
* mvolatile-asm-stop: IA-64 Options. (line 32)
* mvr4130-align: MIPS Options. (line 539)
* mvrsave: RS/6000 and PowerPC Options.
(line 189)
* mvxworks: RS/6000 and PowerPC Options.
(line 562)
* mwarn-dynamicstack: S/390 and zSeries Options.
(line 148)
* mwarn-framesize: S/390 and zSeries Options.
(line 140)
* mwarn-reloc: SPU Options. (line 10)
* mwide-bitfields: MCore Options. (line 23)
* mwindiss: RS/6000 and PowerPC Options.
(line 566)
* mwords-little-endian: ARM Options. (line 76)
* mxgot: MIPS Options. (line 171)
* mxl-compat: RS/6000 and PowerPC Options.
(line 289)
* myellowknife: RS/6000 and PowerPC Options.
(line 557)
* mzarch: S/390 and zSeries Options.
(line 94)
* mzda: V850 Options. (line 45)
* mzero-extend: MMIX Options. (line 26)
* no-integrated-cpp: C Dialect Options. (line 243)
* no-red-zone: i386 and x86-64 Options.
(line 556)
* noall_load: Darwin Options. (line 198)
* nocpp: MIPS Options. (line 455)
* nodefaultlibs: Link Options. (line 62)
* nofixprebinding: Darwin Options. (line 198)
* nolibdld: HPPA Options. (line 189)
* nomultidefs: Darwin Options. (line 198)
* non-static: VxWorks Options. (line 16)
* noprebind: Darwin Options. (line 198)
* noseglinkedit: Darwin Options. (line 198)
* nostartfiles: Link Options. (line 57)
* nostdinc: Preprocessor Options.
(line 379)
* nostdinc++: C++ Dialect Options.
(line 252)
* nostdinc++ <1>: Preprocessor Options.
(line 384)
* nostdlib: Link Options. (line 71)
* no_dead_strip_inits_and_terms: Darwin Options. (line 198)
* o: Overall Options. (line 183)
* O: Optimize Options. (line 32)
* o <1>: Preprocessor Options.
(line 74)
* O0: Optimize Options. (line 107)
* O1: Optimize Options. (line 32)
* O2: Optimize Options. (line 69)
* O3: Optimize Options. (line 101)
* Os: Optimize Options. (line 111)
* p: Debugging Options. (line 214)
* P: Preprocessor Options.
(line 585)
* pagezero_size: Darwin Options. (line 198)
* param: Optimize Options. (line 1511)
* pass-exit-codes: Overall Options. (line 141)
* pedantic: Standards. (line 16)
* pedantic <1>: Warning Options. (line 51)
* pedantic <2>: Preprocessor Options.
(line 165)
* pedantic <3>: C Extensions. (line 6)
* pedantic <4>: Alternate Keywords. (line 29)
* pedantic <5>: Warnings and Errors.
(line 25)
* pedantic-errors: Standards. (line 16)
* pedantic-errors <1>: Warning Options. (line 92)
* pedantic-errors <2>: Preprocessor Options.
(line 170)
* pedantic-errors <3>: Non-bugs. (line 216)
* pedantic-errors <4>: Warnings and Errors.
(line 25)
* pg: Debugging Options. (line 220)
* pie: Link Options. (line 92)
* pipe: Overall Options. (line 205)
* prebind: Darwin Options. (line 198)
* prebind_all_twolevel_modules: Darwin Options. (line 198)
* preprocessor: Preprocessor Options.
(line 24)
* print-file-name: Debugging Options. (line 818)
* print-libgcc-file-name: Debugging Options. (line 839)
* print-multi-directory: Debugging Options. (line 824)
* print-multi-lib: Debugging Options. (line 829)
* print-objc-runtime-info: Objective-C and Objective-C++ Dialect Options.
(line 244)
* print-prog-name: Debugging Options. (line 836)
* print-search-dirs: Debugging Options. (line 847)
* print-sysroot-headers-suffix: Debugging Options. (line 860)
* private_bundle: Darwin Options. (line 198)
* pthread: IA-64 Options. (line 106)
* pthread <1>: RS/6000 and PowerPC Options.
(line 672)
* pthread <2>: SPARC Options. (line 240)
* pthreads: SPARC Options. (line 234)
* Q: Debugging Options. (line 226)
* Qn: System V Options. (line 18)
* Qy: System V Options. (line 14)
* rdynamic: Link Options. (line 98)
* read_only_relocs: Darwin Options. (line 198)
* remap: Preprocessor Options.
(line 632)
* S: Overall Options. (line 166)
* S <1>: Link Options. (line 20)
* s: Link Options. (line 105)
* save-temps: Debugging Options. (line 780)
* sectalign: Darwin Options. (line 198)
* sectcreate: Darwin Options. (line 198)
* sectobjectsymbols: Darwin Options. (line 198)
* sectobjectsymbols <1>: Darwin Options. (line 198)
* sectorder: Darwin Options. (line 198)
* seg1addr: Darwin Options. (line 198)
* segaddr: Darwin Options. (line 198)
* seglinkedit: Darwin Options. (line 198)
* segprot: Darwin Options. (line 198)
* segs_read_only_addr: Darwin Options. (line 198)
* segs_read_only_addr <1>: Darwin Options. (line 198)
* segs_read_write_addr: Darwin Options. (line 198)
* segs_read_write_addr <1>: Darwin Options. (line 198)
* seg_addr_table: Darwin Options. (line 198)
* seg_addr_table_filename: Darwin Options. (line 198)
* shared: Link Options. (line 113)
* shared-libgcc: Link Options. (line 121)
* sim: CRIS Options. (line 107)
* sim2: CRIS Options. (line 113)
* single_module: Darwin Options. (line 198)
* specs: Directory Options. (line 81)
* static: Link Options. (line 109)
* static <1>: Darwin Options. (line 198)
* static <2>: HPPA Options. (line 193)
* static-libgcc: Link Options. (line 121)
* std: Standards. (line 16)
* std <1>: C Dialect Options. (line 46)
* std <2>: Other Builtins. (line 22)
* std <3>: Non-bugs. (line 107)
* std=: Preprocessor Options.
(line 330)
* sub_library: Darwin Options. (line 198)
* sub_umbrella: Darwin Options. (line 198)
* symbolic: Link Options. (line 156)
* sysroot: Directory Options. (line 89)
* target-help: Overall Options. (line 236)
* target-help <1>: Preprocessor Options.
(line 638)
* threads: HPPA Options. (line 206)
* threads <1>: SPARC Options. (line 228)
* time: Debugging Options. (line 794)
* TLS: FRV Options. (line 90)
* tls: FRV Options. (line 94)
* traditional: C Dialect Options. (line 255)
* traditional <1>: Incompatibilities. (line 6)
* traditional-cpp: C Dialect Options. (line 255)
* traditional-cpp <1>: Preprocessor Options.
(line 615)
* trigraphs: C Dialect Options. (line 239)
* trigraphs <1>: Preprocessor Options.
(line 619)
* twolevel_namespace: Darwin Options. (line 198)
* U: Preprocessor Options.
(line 56)
* u: Link Options. (line 178)
* umbrella: Darwin Options. (line 198)
* undef: Preprocessor Options.
(line 60)
* undefined: Darwin Options. (line 198)
* unexported_symbols_list: Darwin Options. (line 198)
* v: Overall Options. (line 194)
* v <1>: Preprocessor Options.
(line 642)
* V: Target Options. (line 24)
* version: Overall Options. (line 344)
* version <1>: Preprocessor Options.
(line 654)
* w: Warning Options. (line 18)
* W: Warning Options. (line 143)
* W <1>: Warning Options. (line 992)
* W <2>: Warning Options. (line 1094)
* w <1>: Preprocessor Options.
(line 161)
* W <3>: Incompatibilities. (line 64)
* Wa: Assembler Options. (line 9)
* Wabi: C++ Dialect Options.
(line 266)
* Waddress: Warning Options. (line 925)
* Waggregate-return: Warning Options. (line 943)
* Wall: Warning Options. (line 96)
* Wall <1>: Preprocessor Options.
(line 80)
* Wall <2>: Standard Libraries. (line 6)
* Warray-bounds: Warning Options. (line 683)
* Wassign-intercept: Objective-C and Objective-C++ Dialect Options.
(line 198)
* Wattributes: Warning Options. (line 948)
* Wbad-function-cast: Warning Options. (line 845)
* Wcast-align: Warning Options. (line 865)
* Wcast-qual: Warning Options. (line 860)
* Wchar-subscripts: Warning Options. (line 187)
* Wclobbered: Warning Options. (line 883)
* Wcomment: Warning Options. (line 192)
* Wcomment <1>: Preprocessor Options.
(line 88)
* Wcomments: Preprocessor Options.
(line 88)
* Wconversion: Warning Options. (line 887)
* Wcoverage-mismatch: Language Independent Options.
(line 42)
* Wctor-dtor-privacy: C++ Dialect Options.
(line 343)
* Wdeclaration-after-statement: Warning Options. (line 803)
* Wdeprecated: C++ Dialect Options.
(line 398)
* Wdeprecated-declarations: Warning Options. (line 1085)
* Wdisabled-optimization: Warning Options. (line 1215)
* Wdiv-by-zero: Warning Options. (line 688)
* weak_reference_mismatches: Darwin Options. (line 198)
* Weffc++: C++ Dialect Options.
(line 370)
* Wempty-body: Warning Options. (line 906)
* Wendif-labels: Warning Options. (line 813)
* Wendif-labels <1>: Preprocessor Options.
(line 138)
* Werror: Warning Options. (line 21)
* Werror <1>: Preprocessor Options.
(line 151)
* Werror=: Warning Options. (line 24)
* Wextra: Warning Options. (line 143)
* Wextra <1>: Warning Options. (line 992)
* Wextra <2>: Warning Options. (line 1094)
* Wfatal-errors: Warning Options. (line 38)
* Wfloat-equal: Warning Options. (line 704)
* Wformat: Warning Options. (line 197)
* Wformat <1>: Warning Options. (line 1018)
* Wformat <2>: Function Attributes.
(line 365)
* Wformat-extra-args: Warning Options. (line 234)
* Wformat-nonliteral: Warning Options. (line 251)
* Wformat-nonliteral <1>: Function Attributes.
(line 417)
* Wformat-security: Warning Options. (line 256)
* Wformat-y2k: Warning Options. (line 230)
* Wformat-zero-length: Warning Options. (line 247)
* Wformat=2: Warning Options. (line 267)
* whatsloaded: Darwin Options. (line 198)
* whyload: Darwin Options. (line 198)
* Wignored-qualifiers: Warning Options. (line 307)
* Wimplicit: Warning Options. (line 303)
* Wimplicit-function-declaration: Warning Options. (line 297)
* Wimplicit-int: Warning Options. (line 293)
* Wimport: Warning Options. (line 184)
* Wimport <1>: Preprocessor Options.
(line 111)
* Winit-self: Warning Options. (line 279)
* Winline: Warning Options. (line 1155)
* Winline <1>: Inline. (line 63)
* Wint-to-pointer-cast: Warning Options. (line 1182)
* Winvalid-offsetof: Warning Options. (line 1168)
* Winvalid-pch: Warning Options. (line 1190)
* Wl: Link Options. (line 174)
* Wlarger-than-LEN: Warning Options. (line 822)
* Wlogical-op: Warning Options. (line 938)
* Wlong-long: Warning Options. (line 1194)
* Wmain: Warning Options. (line 318)
* Wmissing-braces: Warning Options. (line 324)
* Wmissing-declarations: Warning Options. (line 984)
* Wmissing-field-initializers: Warning Options. (line 992)
* Wmissing-format-attribute: Warning Options. (line 1018)
* Wmissing-include-dirs: Warning Options. (line 334)
* Wmissing-noreturn: Warning Options. (line 1010)
* Wmissing-parameter-type: Warning Options. (line 970)
* Wmissing-prototypes: Warning Options. (line 978)
* Wmultichar: Warning Options. (line 1037)
* Wnested-externs: Warning Options. (line 1130)
* Wno-abi: C++ Dialect Options.
(line 266)
* Wno-address: Warning Options. (line 925)
* Wno-aggregate-return: Warning Options. (line 943)
* Wno-all: Warning Options. (line 96)
* Wno-array-bounds: Warning Options. (line 683)
* Wno-assign-intercept: Objective-C and Objective-C++ Dialect Options.
(line 198)
* Wno-attributes: Warning Options. (line 948)
* Wno-bad-function-cast: Warning Options. (line 845)
* Wno-cast-align: Warning Options. (line 865)
* Wno-cast-qual: Warning Options. (line 860)
* Wno-char-subscripts: Warning Options. (line 187)
* Wno-clobbered: Warning Options. (line 883)
* Wno-comment: Warning Options. (line 192)
* Wno-conversion: Warning Options. (line 887)
* Wno-ctor-dtor-privacy: C++ Dialect Options.
(line 343)
* Wno-declaration-after-statement: Warning Options. (line 803)
* Wno-deprecated: C++ Dialect Options.
(line 398)
* Wno-deprecated-declarations: Warning Options. (line 1085)
* Wno-disabled-optimization: Warning Options. (line 1215)
* Wno-div-by-zero: Warning Options. (line 688)
* Wno-effc++: C++ Dialect Options.
(line 370)
* Wno-empty-body: Warning Options. (line 906)
* Wno-endif-labels: Warning Options. (line 813)
* Wno-error: Warning Options. (line 21)
* Wno-error=: Warning Options. (line 24)
* Wno-extra: Warning Options. (line 143)
* Wno-extra <1>: Warning Options. (line 992)
* Wno-extra <2>: Warning Options. (line 1094)
* Wno-fatal-errors: Warning Options. (line 38)
* Wno-float-equal: Warning Options. (line 704)
* Wno-format: Warning Options. (line 197)
* Wno-format <1>: Warning Options. (line 1018)
* Wno-format-extra-args: Warning Options. (line 234)
* Wno-format-nonliteral: Warning Options. (line 251)
* Wno-format-security: Warning Options. (line 256)
* Wno-format-y2k: Warning Options. (line 230)
* Wno-format-zero-length: Warning Options. (line 247)
* Wno-format=2: Warning Options. (line 267)
* Wno-ignored-qualifiers: Warning Options. (line 307)
* Wno-implicit: Warning Options. (line 303)
* Wno-implicit-function-declaration: Warning Options. (line 297)
* Wno-implicit-int: Warning Options. (line 293)
* Wno-import: Warning Options. (line 184)
* Wno-init-self: Warning Options. (line 279)
* Wno-inline: Warning Options. (line 1155)
* Wno-int-to-pointer-cast: Warning Options. (line 1182)
* Wno-invalid-offsetof: Warning Options. (line 1168)
* Wno-invalid-pch: Warning Options. (line 1190)
* Wno-logical-op: Warning Options. (line 938)
* Wno-long-long: Warning Options. (line 1194)
* Wno-main: Warning Options. (line 318)
* Wno-missing-braces: Warning Options. (line 324)
* Wno-missing-declarations: Warning Options. (line 984)
* Wno-missing-field-initializers: Warning Options. (line 992)
* Wno-missing-format-attribute: Warning Options. (line 1018)
* Wno-missing-include-dirs: Warning Options. (line 334)
* Wno-missing-noreturn: Warning Options. (line 1010)
* Wno-missing-parameter-type: Warning Options. (line 970)
* Wno-missing-prototypes: Warning Options. (line 978)
* Wno-multichar: Warning Options. (line 1037)
* Wno-nested-externs: Warning Options. (line 1130)
* Wno-non-template-friend: C++ Dialect Options.
(line 409)
* Wno-non-virtual-dtor: C++ Dialect Options.
(line 348)
* Wno-nonnull: Warning Options. (line 272)
* Wno-old-style-cast: C++ Dialect Options.
(line 425)
* Wno-old-style-declaration: Warning Options. (line 960)
* Wno-old-style-definition: Warning Options. (line 966)
* Wno-overflow: Warning Options. (line 1091)
* Wno-overlength-strings: Warning Options. (line 1235)
* Wno-overloaded-virtual: C++ Dialect Options.
(line 431)
* Wno-override-init: Warning Options. (line 1094)
* Wno-packed: Warning Options. (line 1102)
* Wno-padded: Warning Options. (line 1119)
* Wno-parentheses: Warning Options. (line 337)
* Wno-pmf-conversions: C++ Dialect Options.
(line 450)
* Wno-pmf-conversions <1>: Bound member functions.
(line 35)
* Wno-pointer-arith: Warning Options. (line 831)
* Wno-pointer-sign: Warning Options. (line 1224)
* Wno-pointer-to-int-cast: Warning Options. (line 1186)
* Wno-pragmas: Warning Options. (line 588)
* Wno-protocol: Objective-C and Objective-C++ Dialect Options.
(line 202)
* Wno-redundant-decls: Warning Options. (line 1126)
* Wno-reorder: C++ Dialect Options.
(line 354)
* Wno-return-type: Warning Options. (line 427)
* Wno-selector: Objective-C and Objective-C++ Dialect Options.
(line 212)
* Wno-sequence-point: Warning Options. (line 381)
* Wno-shadow: Warning Options. (line 817)
* Wno-sign-compare: Warning Options. (line 912)
* Wno-sign-conversion: Warning Options. (line 919)
* Wno-sign-promo: C++ Dialect Options.
(line 454)
* Wno-stack-protector: Warning Options. (line 1230)
* Wno-strict-aliasing: Warning Options. (line 593)
* Wno-strict-aliasing=n: Warning Options. (line 600)
* Wno-strict-null-sentinel: C++ Dialect Options.
(line 402)
* Wno-strict-overflow: Warning Options. (line 633)
* Wno-strict-prototypes: Warning Options. (line 954)
* Wno-strict-selector-match: Objective-C and Objective-C++ Dialect Options.
(line 224)
* Wno-switch: Warning Options. (line 441)
* Wno-switch-default: Warning Options. (line 449)
* Wno-switch-enum: Warning Options. (line 452)
* Wno-system-headers: Warning Options. (line 693)
* Wno-traditional: Warning Options. (line 718)
* Wno-traditional-conversion: Warning Options. (line 795)
* Wno-trigraphs: Warning Options. (line 458)
* Wno-type-limits: Warning Options. (line 838)
* Wno-undeclared-selector: Objective-C and Objective-C++ Dialect Options.
(line 232)
* Wno-undef: Warning Options. (line 810)
* Wno-uninitialized: Warning Options. (line 507)
* Wno-unknown-pragmas: Warning Options. (line 581)
* Wno-unreachable-code: Warning Options. (line 1133)
* Wno-unsafe-loop-optimizations: Warning Options. (line 825)
* Wno-unused: Warning Options. (line 500)
* Wno-unused-function: Warning Options. (line 463)
* Wno-unused-label: Warning Options. (line 468)
* Wno-unused-parameter: Warning Options. (line 475)
* Wno-unused-value: Warning Options. (line 490)
* Wno-unused-variable: Warning Options. (line 482)
* Wno-variadic-macros: Warning Options. (line 1200)
* Wno-vla: Warning Options. (line 1206)
* Wno-volatile-register-var: Warning Options. (line 1210)
* Wno-write-strings: Warning Options. (line 871)
* Wnon-template-friend: C++ Dialect Options.
(line 409)
* Wnon-virtual-dtor: C++ Dialect Options.
(line 348)
* Wnonnull: Warning Options. (line 272)
* Wnormalized=: Warning Options. (line 1043)
* Wold-style-cast: C++ Dialect Options.
(line 425)
* Wold-style-declaration: Warning Options. (line 960)
* Wold-style-definition: Warning Options. (line 966)
* Woverflow: Warning Options. (line 1091)
* Woverlength-strings: Warning Options. (line 1235)
* Woverloaded-virtual: C++ Dialect Options.
(line 431)
* Woverride-init: Warning Options. (line 1094)
* Wp: Preprocessor Options.
(line 13)
* Wpacked: Warning Options. (line 1102)
* Wpadded: Warning Options. (line 1119)
* Wparentheses: Warning Options. (line 337)
* Wpmf-conversions: C++ Dialect Options.
(line 450)
* Wpointer-arith: Warning Options. (line 831)
* Wpointer-arith <1>: Pointer Arith. (line 13)
* Wpointer-sign: Warning Options. (line 1224)
* Wpointer-to-int-cast: Warning Options. (line 1186)
* Wpragmas: Warning Options. (line 588)
* Wprotocol: Objective-C and Objective-C++ Dialect Options.
(line 202)
* Wredundant-decls: Warning Options. (line 1126)
* Wreorder: C++ Dialect Options.
(line 354)
* Wreturn-type: Warning Options. (line 427)
* Wselector: Objective-C and Objective-C++ Dialect Options.
(line 212)
* Wsequence-point: Warning Options. (line 381)
* Wshadow: Warning Options. (line 817)
* Wsign-compare: Warning Options. (line 912)
* Wsign-conversion: Warning Options. (line 919)
* Wsign-promo: C++ Dialect Options.
(line 454)
* Wstack-protector: Warning Options. (line 1230)
* Wstrict-aliasing: Warning Options. (line 593)
* Wstrict-aliasing=n: Warning Options. (line 600)
* Wstrict-null-sentinel: C++ Dialect Options.
(line 402)
* Wstrict-overflow: Warning Options. (line 633)
* Wstrict-prototypes: Warning Options. (line 954)
* Wstrict-selector-match: Objective-C and Objective-C++ Dialect Options.
(line 224)
* Wswitch: Warning Options. (line 441)
* Wswitch-default: Warning Options. (line 449)
* Wswitch-enum: Warning Options. (line 452)
* Wsystem-headers: Warning Options. (line 693)
* Wsystem-headers <1>: Preprocessor Options.
(line 155)
* Wtraditional: Warning Options. (line 718)
* Wtraditional <1>: Preprocessor Options.
(line 105)
* Wtraditional-conversion: Warning Options. (line 795)
* Wtraditional-conversion <1>: Protoize Caveats. (line 31)
* Wtrigraphs: Warning Options. (line 458)
* Wtrigraphs <1>: Preprocessor Options.
(line 93)
* Wtype-limits: Warning Options. (line 838)
* Wundeclared-selector: Objective-C and Objective-C++ Dialect Options.
(line 232)
* Wundef: Warning Options. (line 810)
* Wundef <1>: Preprocessor Options.
(line 114)
* Wuninitialized: Warning Options. (line 507)
* Wunknown-pragmas: Warning Options. (line 581)
* Wunreachable-code: Warning Options. (line 1133)
* Wunsafe-loop-optimizations: Warning Options. (line 825)
* Wunused: Warning Options. (line 500)
* Wunused-function: Warning Options. (line 463)
* Wunused-label: Warning Options. (line 468)
* Wunused-macros: Preprocessor Options.
(line 119)
* Wunused-parameter: Warning Options. (line 475)
* Wunused-value: Warning Options. (line 490)
* Wunused-variable: Warning Options. (line 482)
* Wvariadic-macros: Warning Options. (line 1200)
* Wvla: Warning Options. (line 1206)
* Wvolatile-register-var: Warning Options. (line 1210)
* Wwrite-strings: Warning Options. (line 871)
* x: Overall Options. (line 117)
* x <1>: Preprocessor Options.
(line 314)
* Xassembler: Assembler Options. (line 13)
* Xbind-lazy: VxWorks Options. (line 26)
* Xbind-now: VxWorks Options. (line 30)
* Xlinker: Link Options. (line 162)
* Ym: System V Options. (line 26)
* YP: System V Options. (line 22)

File: gcc.info, Node: Keyword Index, Prev: Option Index, Up: Top
Keyword Index
*************
�[index�]
* Menu:
* '!' in constraint: Multi-Alternative. (line 33)
* '#' in constraint: Modifiers. (line 57)
* #pragma: Pragmas. (line 6)
* #pragma implementation: C++ Interface. (line 39)
* '#pragma implementation', implied: C++ Interface. (line 46)
* #pragma interface: C++ Interface. (line 20)
* '#pragma', reason for not using: Function Attributes.
(line 1110)
* $: Dollar Signs. (line 6)
* '%' in constraint: Modifiers. (line 45)
* %include: Spec Files. (line 26)
* %include_noerr: Spec Files. (line 30)
* %rename: Spec Files. (line 34)
* '&' in constraint: Modifiers. (line 25)
* ': Incompatibilities. (line 116)
* (): Constructing Calls. (line 52)
* () <1>: Constructing Calls. (line 75)
* '*' in constraint: Modifiers. (line 62)
* '+' in constraint: Modifiers. (line 12)
* '-lgcc', use with '-nodefaultlibs': Link Options. (line 79)
* '-lgcc', use with '-nostdlib': Link Options. (line 79)
* '-nodefaultlibs' and unresolved references: Link Options. (line 79)
* '-nostdlib' and unresolved references: Link Options. (line 79)
* .sdata/.sdata2 references (PowerPC): RS/6000 and PowerPC Options.
(line 626)
* //: C++ Comments. (line 6)
* '0' in constraint: Simple Constraints. (line 114)
* '<' in constraint: Simple Constraints. (line 45)
* '=' in constraint: Modifiers. (line 8)
* '>' in constraint: Simple Constraints. (line 49)
* '?' in constraint: Multi-Alternative. (line 27)
* '?:' extensions: Conditionals. (line 6)
* ?: side effect: Conditionals. (line 20)
* '_' in variables in macros: Typeof. (line 42)
* '_Accum' data type: Fixed-Point. (line 6)
* '_Complex' keyword: Complex. (line 6)
* '_Decimal128' data type: Decimal Float. (line 6)
* '_Decimal32' data type: Decimal Float. (line 6)
* '_Decimal64' data type: Decimal Float. (line 6)
* _Exit: Other Builtins. (line 6)
* _exit: Other Builtins. (line 6)
* '_Fract' data type: Fixed-Point. (line 6)
* '_Sat' data type: Fixed-Point. (line 6)
* __builtin_apply: Constructing Calls. (line 29)
* __builtin_apply_args: Constructing Calls. (line 19)
* __builtin_bswap32: Other Builtins. (line 471)
* __builtin_bswap64: Other Builtins. (line 476)
* __builtin_choose_expr: Other Builtins. (line 152)
* __builtin_clz: Other Builtins. (line 404)
* __builtin_clzl: Other Builtins. (line 422)
* __builtin_clzll: Other Builtins. (line 442)
* __builtin_constant_p: Other Builtins. (line 193)
* __builtin_ctz: Other Builtins. (line 408)
* __builtin_ctzl: Other Builtins. (line 426)
* __builtin_ctzll: Other Builtins. (line 446)
* __builtin_expect: Other Builtins. (line 238)
* __builtin_ffs: Other Builtins. (line 400)
* __builtin_ffsl: Other Builtins. (line 418)
* __builtin_ffsll: Other Builtins. (line 438)
* __builtin_frame_address: Return Address. (line 32)
* __builtin_huge_val: Other Builtins. (line 321)
* __builtin_huge_valf: Other Builtins. (line 326)
* __builtin_huge_vall: Other Builtins. (line 329)
* __builtin_inf: Other Builtins. (line 333)
* __builtin_infd128: Other Builtins. (line 343)
* __builtin_infd32: Other Builtins. (line 337)
* __builtin_infd64: Other Builtins. (line 340)
* __builtin_inff: Other Builtins. (line 347)
* __builtin_infl: Other Builtins. (line 352)
* __builtin_isfinite: Other Builtins. (line 6)
* __builtin_isgreater: Other Builtins. (line 6)
* __builtin_isgreaterequal: Other Builtins. (line 6)
* __builtin_isless: Other Builtins. (line 6)
* __builtin_islessequal: Other Builtins. (line 6)
* __builtin_islessgreater: Other Builtins. (line 6)
* __builtin_isnormal: Other Builtins. (line 6)
* __builtin_isunordered: Other Builtins. (line 6)
* __builtin_nan: Other Builtins. (line 356)
* __builtin_nand128: Other Builtins. (line 378)
* __builtin_nand32: Other Builtins. (line 372)
* __builtin_nand64: Other Builtins. (line 375)
* __builtin_nanf: Other Builtins. (line 382)
* __builtin_nanl: Other Builtins. (line 385)
* __builtin_nans: Other Builtins. (line 389)
* __builtin_nansf: Other Builtins. (line 393)
* __builtin_nansl: Other Builtins. (line 396)
* __builtin_object_size: Object Size Checking.
(line 6)
* __builtin_object_size <1>: Object Size Checking.
(line 9)
* __builtin_offsetof: Offsetof. (line 6)
* __builtin_parity: Other Builtins. (line 415)
* __builtin_parityl: Other Builtins. (line 434)
* __builtin_parityll: Other Builtins. (line 454)
* __builtin_popcount: Other Builtins. (line 412)
* __builtin_popcountl: Other Builtins. (line 430)
* __builtin_popcountll: Other Builtins. (line 450)
* __builtin_powi: Other Builtins. (line 6)
* __builtin_powi <1>: Other Builtins. (line 458)
* __builtin_powif: Other Builtins. (line 6)
* __builtin_powif <1>: Other Builtins. (line 463)
* __builtin_powil: Other Builtins. (line 6)
* __builtin_powil <1>: Other Builtins. (line 467)
* __builtin_prefetch: Other Builtins. (line 282)
* __builtin_return: Constructing Calls. (line 47)
* __builtin_return_address: Return Address. (line 9)
* __builtin_trap: Other Builtins. (line 262)
* __builtin_types_compatible_p: Other Builtins. (line 107)
* __builtin___clear_cache: Other Builtins. (line 269)
* __builtin___fprintf_chk: Object Size Checking.
(line 6)
* __builtin___memcpy_chk: Object Size Checking.
(line 6)
* __builtin___memmove_chk: Object Size Checking.
(line 6)
* __builtin___mempcpy_chk: Object Size Checking.
(line 6)
* __builtin___memset_chk: Object Size Checking.
(line 6)
* __builtin___printf_chk: Object Size Checking.
(line 6)
* __builtin___snprintf_chk: Object Size Checking.
(line 6)
* __builtin___sprintf_chk: Object Size Checking.
(line 6)
* __builtin___stpcpy_chk: Object Size Checking.
(line 6)
* __builtin___strcat_chk: Object Size Checking.
(line 6)
* __builtin___strcpy_chk: Object Size Checking.
(line 6)
* __builtin___strncat_chk: Object Size Checking.
(line 6)
* __builtin___strncpy_chk: Object Size Checking.
(line 6)
* __builtin___vfprintf_chk: Object Size Checking.
(line 6)
* __builtin___vprintf_chk: Object Size Checking.
(line 6)
* __builtin___vsnprintf_chk: Object Size Checking.
(line 6)
* __builtin___vsprintf_chk: Object Size Checking.
(line 6)
* '__complex__' keyword: Complex. (line 6)
* '__declspec(dllexport)': Function Attributes.
(line 244)
* '__declspec(dllimport)': Function Attributes.
(line 272)
* __extension__: Alternate Keywords. (line 29)
* '__float128' data type: Floating Types. (line 6)
* '__float80' data type: Floating Types. (line 6)
* '__FUNCTION__' identifier: Function Names. (line 6)
* '__func__' identifier: Function Names. (line 6)
* '__imag__' keyword: Complex. (line 27)
* '__PRETTY_FUNCTION__' identifier: Function Names. (line 6)
* '__real__' keyword: Complex. (line 27)
* __STDC_HOSTED__: Standards. (line 13)
* __sync_add_and_fetch: Atomic Builtins. (line 57)
* __sync_and_and_fetch: Atomic Builtins. (line 57)
* __sync_bool_compare_and_swap: Atomic Builtins. (line 65)
* __sync_fetch_and_add: Atomic Builtins. (line 45)
* __sync_fetch_and_and: Atomic Builtins. (line 45)
* __sync_fetch_and_nand: Atomic Builtins. (line 45)
* __sync_fetch_and_or: Atomic Builtins. (line 45)
* __sync_fetch_and_sub: Atomic Builtins. (line 45)
* __sync_fetch_and_xor: Atomic Builtins. (line 45)
* __sync_lock_release: Atomic Builtins. (line 94)
* __sync_lock_test_and_set: Atomic Builtins. (line 76)
* __sync_nand_and_fetch: Atomic Builtins. (line 57)
* __sync_or_and_fetch: Atomic Builtins. (line 57)
* __sync_sub_and_fetch: Atomic Builtins. (line 57)
* __sync_synchronize: Atomic Builtins. (line 73)
* __sync_val_compare_and_swap: Atomic Builtins. (line 65)
* __sync_xor_and_fetch: Atomic Builtins. (line 57)
* __thread: Thread-Local. (line 6)
* ABI: Compatibility. (line 6)
* abort: Other Builtins. (line 6)
* abs: Other Builtins. (line 6)
* accessing volatiles: Volatiles. (line 6)
* acos: Other Builtins. (line 6)
* acosf: Other Builtins. (line 6)
* acosh: Other Builtins. (line 6)
* acoshf: Other Builtins. (line 6)
* acoshl: Other Builtins. (line 6)
* acosl: Other Builtins. (line 6)
* Ada: G++ and GCC. (line 6)
* Ada <1>: G++ and GCC. (line 30)
* additional floating types: Floating Types. (line 6)
* address constraints: Simple Constraints. (line 141)
* address of a label: Labels as Values. (line 6)
* address_operand: Simple Constraints. (line 145)
* 'alias' attribute: Function Attributes.
(line 34)
* aliasing of parameters: Code Gen Options. (line 373)
* 'aligned' attribute: Function Attributes.
(line 47)
* 'aligned' attribute <1>: Variable Attributes.
(line 23)
* 'aligned' attribute <2>: Type Attributes. (line 31)
* alignment: Alignment. (line 6)
* alloca: Other Builtins. (line 6)
* 'alloca' vs variable-length arrays: Variable Length. (line 27)
* 'alloc_size' attribute: Function Attributes.
(line 67)
* Allow nesting in an interrupt handler on the Blackfin processor.: Function Attributes.
(line 647)
* alternate keywords: Alternate Keywords. (line 6)
* 'always_inline' function attribute: Function Attributes.
(line 88)
* AMD x86-64 Options: i386 and x86-64 Options.
(line 6)
* AMD1: Standards. (line 13)
* ANSI C: Standards. (line 13)
* ANSI C standard: Standards. (line 13)
* ANSI C89: Standards. (line 13)
* ANSI support: C Dialect Options. (line 10)
* ANSI X3.159-1989: Standards. (line 13)
* apostrophes: Incompatibilities. (line 116)
* application binary interface: Compatibility. (line 6)
* ARC Options: ARC Options. (line 6)
* ARM options: ARM Options. (line 6)
* ARM [Annotated C++ Reference Manual]: Backwards Compatibility.
(line 6)
* arrays of length zero: Zero Length. (line 6)
* arrays of variable length: Variable Length. (line 6)
* arrays, non-lvalue: Subscripting. (line 6)
* 'artificial' function attribute: Function Attributes.
(line 129)
* asin: Other Builtins. (line 6)
* asinf: Other Builtins. (line 6)
* asinh: Other Builtins. (line 6)
* asinhf: Other Builtins. (line 6)
* asinhl: Other Builtins. (line 6)
* asinl: Other Builtins. (line 6)
* 'asm' constraints: Constraints. (line 6)
* 'asm' expressions: Extended Asm. (line 6)
* assembler instructions: Extended Asm. (line 6)
* assembler names for identifiers: Asm Labels. (line 6)
* assembly code, invalid: Bug Criteria. (line 12)
* atan: Other Builtins. (line 6)
* atan2: Other Builtins. (line 6)
* atan2f: Other Builtins. (line 6)
* atan2l: Other Builtins. (line 6)
* atanf: Other Builtins. (line 6)
* atanh: Other Builtins. (line 6)
* atanhf: Other Builtins. (line 6)
* atanhl: Other Builtins. (line 6)
* atanl: Other Builtins. (line 6)
* attribute of types: Type Attributes. (line 6)
* attribute of variables: Variable Attributes.
(line 6)
* attribute syntax: Attribute Syntax. (line 6)
* autoincrement/decrement addressing: Simple Constraints. (line 28)
* automatic 'inline' for C++ member fns: Inline. (line 71)
* AVR Options: AVR Options. (line 6)
* Backwards Compatibility: Backwards Compatibility.
(line 6)
* base class members: Name lookup. (line 6)
* bcmp: Other Builtins. (line 6)
* 'below100' attribute: Variable Attributes.
(line 476)
* binary compatibility: Compatibility. (line 6)
* Binary constants using the '0b' prefix: Binary constants. (line 6)
* Blackfin Options: Blackfin Options. (line 6)
* bound pointer to member function: Bound member functions.
(line 6)
* bounds checking: Optimize Options. (line 328)
* bug criteria: Bug Criteria. (line 6)
* bugs: Bugs. (line 6)
* bugs, known: Trouble. (line 6)
* built-in functions: C Dialect Options. (line 170)
* built-in functions <1>: Other Builtins. (line 6)
* bzero: Other Builtins. (line 6)
* C compilation options: Invoking GCC. (line 17)
* C intermediate output, nonexistent: G++ and GCC. (line 35)
* C language extensions: C Extensions. (line 6)
* C language, traditional: C Dialect Options. (line 253)
* C standard: Standards. (line 13)
* C standards: Standards. (line 13)
* c++: Invoking G++. (line 14)
* C++: G++ and GCC. (line 30)
* C++ comments: C++ Comments. (line 6)
* C++ compilation options: Invoking GCC. (line 23)
* C++ interface and implementation headers: C++ Interface. (line 6)
* C++ language extensions: C++ Extensions. (line 6)
* C++ member fns, automatically 'inline': Inline. (line 71)
* C++ misunderstandings: C++ Misunderstandings.
(line 6)
* C++ options, command line: C++ Dialect Options.
(line 6)
* C++ pragmas, effect on inlining: C++ Interface. (line 66)
* C++ source file suffixes: Invoking G++. (line 6)
* C++ static data, declaring and defining: Static Definitions.
(line 6)
* C89: Standards. (line 13)
* C90: Standards. (line 13)
* C94: Standards. (line 13)
* C95: Standards. (line 13)
* C99: Standards. (line 13)
* C9X: Standards. (line 13)
* cabs: Other Builtins. (line 6)
* cabsf: Other Builtins. (line 6)
* cabsl: Other Builtins. (line 6)
* cacos: Other Builtins. (line 6)
* cacosf: Other Builtins. (line 6)
* cacosh: Other Builtins. (line 6)
* cacoshf: Other Builtins. (line 6)
* cacoshl: Other Builtins. (line 6)
* cacosl: Other Builtins. (line 6)
* calling functions through the function vector on H8/300, M16C, and M32C processors: Function Attributes.
(line 455)
* calloc: Other Builtins. (line 6)
* carg: Other Builtins. (line 6)
* cargf: Other Builtins. (line 6)
* cargl: Other Builtins. (line 6)
* case labels in initializers: Designated Inits. (line 6)
* case ranges: Case Ranges. (line 6)
* casin: Other Builtins. (line 6)
* casinf: Other Builtins. (line 6)
* casinh: Other Builtins. (line 6)
* casinhf: Other Builtins. (line 6)
* casinhl: Other Builtins. (line 6)
* casinl: Other Builtins. (line 6)
* cast to a union: Cast to Union. (line 6)
* catan: Other Builtins. (line 6)
* catanf: Other Builtins. (line 6)
* catanh: Other Builtins. (line 6)
* catanhf: Other Builtins. (line 6)
* catanhl: Other Builtins. (line 6)
* catanl: Other Builtins. (line 6)
* cbrt: Other Builtins. (line 6)
* cbrtf: Other Builtins. (line 6)
* cbrtl: Other Builtins. (line 6)
* ccos: Other Builtins. (line 6)
* ccosf: Other Builtins. (line 6)
* ccosh: Other Builtins. (line 6)
* ccoshf: Other Builtins. (line 6)
* ccoshl: Other Builtins. (line 6)
* ccosl: Other Builtins. (line 6)
* ceil: Other Builtins. (line 6)
* ceilf: Other Builtins. (line 6)
* ceill: Other Builtins. (line 6)
* cexp: Other Builtins. (line 6)
* cexpf: Other Builtins. (line 6)
* cexpl: Other Builtins. (line 6)
* character set, execution: Preprocessor Options.
(line 499)
* character set, input: Preprocessor Options.
(line 512)
* character set, input normalization: Warning Options. (line 1043)
* character set, wide execution: Preprocessor Options.
(line 504)
* cimag: Other Builtins. (line 6)
* cimagf: Other Builtins. (line 6)
* cimagl: Other Builtins. (line 6)
* 'cleanup' attribute: Variable Attributes.
(line 83)
* clog: Other Builtins. (line 6)
* clogf: Other Builtins. (line 6)
* clogl: Other Builtins. (line 6)
* COBOL: G++ and GCC. (line 23)
* code generation conventions: Code Gen Options. (line 6)
* code, mixed with declarations: Mixed Declarations. (line 6)
* 'cold' function attribute: Function Attributes.
(line 781)
* command options: Invoking GCC. (line 6)
* comments, C++ style: C++ Comments. (line 6)
* 'common' attribute: Variable Attributes.
(line 99)
* comparison of signed and unsigned values, warning: Warning Options.
(line 912)
* compiler bugs, reporting: Bug Reporting. (line 6)
* compiler compared to C++ preprocessor: G++ and GCC. (line 35)
* compiler options, C++: C++ Dialect Options.
(line 6)
* compiler options, Objective-C and Objective-C++: Objective-C and Objective-C++ Dialect Options.
(line 6)
* compiler version, specifying: Target Options. (line 6)
* COMPILER_PATH: Environment Variables.
(line 88)
* complex conjugation: Complex. (line 34)
* complex numbers: Complex. (line 6)
* compound literals: Compound Literals. (line 6)
* computed gotos: Labels as Values. (line 6)
* conditional expressions, extensions: Conditionals. (line 6)
* conflicting types: Disappointments. (line 21)
* conj: Other Builtins. (line 6)
* conjf: Other Builtins. (line 6)
* conjl: Other Builtins. (line 6)
* 'const' applied to function: Function Attributes.
(line 6)
* 'const' function attribute: Function Attributes.
(line 176)
* constants in constraints: Simple Constraints. (line 57)
* constraint modifier characters: Modifiers. (line 6)
* constraint, matching: Simple Constraints. (line 126)
* constraints, 'asm': Constraints. (line 6)
* constraints, machine specific: Machine Constraints.
(line 6)
* constructing calls: Constructing Calls. (line 6)
* constructor expressions: Compound Literals. (line 6)
* 'constructor' function attribute: Function Attributes.
(line 204)
* contributors: Contributors. (line 6)
* copysign: Other Builtins. (line 6)
* copysignf: Other Builtins. (line 6)
* copysignl: Other Builtins. (line 6)
* core dump: Bug Criteria. (line 9)
* cos: Other Builtins. (line 6)
* cosf: Other Builtins. (line 6)
* cosh: Other Builtins. (line 6)
* coshf: Other Builtins. (line 6)
* coshl: Other Builtins. (line 6)
* cosl: Other Builtins. (line 6)
* CPATH: Environment Variables.
(line 124)
* CPLUS_INCLUDE_PATH: Environment Variables.
(line 126)
* cpow: Other Builtins. (line 6)
* cpowf: Other Builtins. (line 6)
* cpowl: Other Builtins. (line 6)
* cproj: Other Builtins. (line 6)
* cprojf: Other Builtins. (line 6)
* cprojl: Other Builtins. (line 6)
* creal: Other Builtins. (line 6)
* crealf: Other Builtins. (line 6)
* creall: Other Builtins. (line 6)
* CRIS Options: CRIS Options. (line 6)
* cross compiling: Target Options. (line 6)
* CRX Options: CRX Options. (line 6)
* csin: Other Builtins. (line 6)
* csinf: Other Builtins. (line 6)
* csinh: Other Builtins. (line 6)
* csinhf: Other Builtins. (line 6)
* csinhl: Other Builtins. (line 6)
* csinl: Other Builtins. (line 6)
* csqrt: Other Builtins. (line 6)
* csqrtf: Other Builtins. (line 6)
* csqrtl: Other Builtins. (line 6)
* ctan: Other Builtins. (line 6)
* ctanf: Other Builtins. (line 6)
* ctanh: Other Builtins. (line 6)
* ctanhf: Other Builtins. (line 6)
* ctanhl: Other Builtins. (line 6)
* ctanl: Other Builtins. (line 6)
* C_INCLUDE_PATH: Environment Variables.
(line 125)
* Darwin options: Darwin Options. (line 6)
* dcgettext: Other Builtins. (line 6)
* 'dd' integer suffix: Decimal Float. (line 6)
* 'DD' integer suffix: Decimal Float. (line 6)
* deallocating variable length arrays: Variable Length. (line 23)
* debugging information options: Debugging Options. (line 6)
* decimal floating types: Decimal Float. (line 6)
* declaration scope: Incompatibilities. (line 80)
* declarations inside expressions: Statement Exprs. (line 6)
* declarations, mixed with code: Mixed Declarations. (line 6)
* declaring attributes of functions: Function Attributes.
(line 6)
* declaring static data in C++: Static Definitions. (line 6)
* defining static data in C++: Static Definitions. (line 6)
* dependencies for make as output: Environment Variables.
(line 152)
* dependencies for make as output <1>: Environment Variables.
(line 168)
* dependencies, make: Preprocessor Options.
(line 175)
* DEPENDENCIES_OUTPUT: Environment Variables.
(line 151)
* dependent name lookup: Name lookup. (line 6)
* 'deprecated' attribute: Variable Attributes.
(line 107)
* 'deprecated' attribute.: Function Attributes.
(line 226)
* designated initializers: Designated Inits. (line 6)
* designator lists: Designated Inits. (line 93)
* designators: Designated Inits. (line 61)
* 'destructor' function attribute: Function Attributes.
(line 204)
* 'df' integer suffix: Decimal Float. (line 6)
* 'DF' integer suffix: Decimal Float. (line 6)
* dgettext: Other Builtins. (line 6)
* diagnostic messages: Language Independent Options.
(line 6)
* dialect options: C Dialect Options. (line 6)
* digits in constraint: Simple Constraints. (line 114)
* directory options: Directory Options. (line 6)
* 'dl' integer suffix: Decimal Float. (line 6)
* 'DL' integer suffix: Decimal Float. (line 6)
* dollar signs in identifier names: Dollar Signs. (line 6)
* double-word arithmetic: Long Long. (line 6)
* downward funargs: Nested Functions. (line 6)
* drem: Other Builtins. (line 6)
* dremf: Other Builtins. (line 6)
* dreml: Other Builtins. (line 6)
* 'E' in constraint: Simple Constraints. (line 76)
* earlyclobber operand: Modifiers. (line 25)
* eight bit data on the H8/300, H8/300H, and H8S: Function Attributes.
(line 324)
* empty structures: Empty Structures. (line 6)
* environment variables: Environment Variables.
(line 6)
* erf: Other Builtins. (line 6)
* erfc: Other Builtins. (line 6)
* erfcf: Other Builtins. (line 6)
* erfcl: Other Builtins. (line 6)
* erff: Other Builtins. (line 6)
* erfl: Other Builtins. (line 6)
* 'error' function attribute: Function Attributes.
(line 145)
* error messages: Warnings and Errors.
(line 6)
* escaped newlines: Escaped Newlines. (line 6)
* exception handler functions on the Blackfin processor: Function Attributes.
(line 334)
* exclamation point: Multi-Alternative. (line 33)
* exit: Other Builtins. (line 6)
* exp: Other Builtins. (line 6)
* exp10: Other Builtins. (line 6)
* exp10f: Other Builtins. (line 6)
* exp10l: Other Builtins. (line 6)
* exp2: Other Builtins. (line 6)
* exp2f: Other Builtins. (line 6)
* exp2l: Other Builtins. (line 6)
* expf: Other Builtins. (line 6)
* expl: Other Builtins. (line 6)
* explicit register variables: Explicit Reg Vars. (line 6)
* expm1: Other Builtins. (line 6)
* expm1f: Other Builtins. (line 6)
* expm1l: Other Builtins. (line 6)
* expressions containing statements: Statement Exprs. (line 6)
* expressions, constructor: Compound Literals. (line 6)
* extended 'asm': Extended Asm. (line 6)
* extensible constraints: Simple Constraints. (line 150)
* extensions, '?:': Conditionals. (line 6)
* extensions, C language: C Extensions. (line 6)
* extensions, C++ language: C++ Extensions. (line 6)
* external declaration scope: Incompatibilities. (line 80)
* 'externally_visible' attribute.: Function Attributes.
(line 1102)
* 'F' in constraint: Simple Constraints. (line 81)
* fabs: Other Builtins. (line 6)
* fabsf: Other Builtins. (line 6)
* fabsl: Other Builtins. (line 6)
* fatal signal: Bug Criteria. (line 9)
* fdim: Other Builtins. (line 6)
* fdimf: Other Builtins. (line 6)
* fdiml: Other Builtins. (line 6)
* FDL, GNU Free Documentation License: GNU Free Documentation License.
(line 6)
* ffs: Other Builtins. (line 6)
* file name suffix: Overall Options. (line 14)
* file names: Link Options. (line 10)
* fixed-point types: Fixed-Point. (line 6)
* 'flatten' function attribute: Function Attributes.
(line 136)
* flexible array members: Zero Length. (line 6)
* 'float' as function value type: Incompatibilities. (line 141)
* floating point precision: Optimize Options. (line 1172)
* floating point precision <1>: Disappointments. (line 68)
* floor: Other Builtins. (line 6)
* floorf: Other Builtins. (line 6)
* floorl: Other Builtins. (line 6)
* fma: Other Builtins. (line 6)
* fmaf: Other Builtins. (line 6)
* fmal: Other Builtins. (line 6)
* fmax: Other Builtins. (line 6)
* fmaxf: Other Builtins. (line 6)
* fmaxl: Other Builtins. (line 6)
* fmin: Other Builtins. (line 6)
* fminf: Other Builtins. (line 6)
* fminl: Other Builtins. (line 6)
* fmod: Other Builtins. (line 6)
* fmodf: Other Builtins. (line 6)
* fmodl: Other Builtins. (line 6)
* 'force_align_arg_pointer' attribute: Function Attributes.
(line 823)
* 'format' function attribute: Function Attributes.
(line 365)
* 'format_arg' function attribute: Function Attributes.
(line 417)
* Fortran: G++ and GCC. (line 6)
* forwarding calls: Constructing Calls. (line 6)
* fprintf: Other Builtins. (line 6)
* fprintf_unlocked: Other Builtins. (line 6)
* fputs: Other Builtins. (line 6)
* fputs_unlocked: Other Builtins. (line 6)
* freestanding environment: Standards. (line 13)
* freestanding implementation: Standards. (line 13)
* frexp: Other Builtins. (line 6)
* frexpf: Other Builtins. (line 6)
* frexpl: Other Builtins. (line 6)
* FRV Options: FRV Options. (line 6)
* fscanf: Other Builtins. (line 6)
* 'fscanf', and constant strings: Incompatibilities. (line 17)
* function addressability on the M32R/D: Function Attributes.
(line 606)
* function attributes: Function Attributes.
(line 6)
* function pointers, arithmetic: Pointer Arith. (line 6)
* function prototype declarations: Function Prototypes.
(line 6)
* function without a prologue/epilogue code: Function Attributes.
(line 635)
* function, size of pointer to: Pointer Arith. (line 6)
* functions called via pointer on the RS/6000 and PowerPC: Function Attributes.
(line 559)
* functions in arbitrary sections: Function Attributes.
(line 6)
* functions that are passed arguments in registers on the 386: Function Attributes.
(line 6)
* functions that are passed arguments in registers on the 386 <1>: Function Attributes.
(line 799)
* functions that behave like malloc: Function Attributes.
(line 6)
* functions that do not pop the argument stack on the 386: Function Attributes.
(line 6)
* functions that do pop the argument stack on the 386: Function Attributes.
(line 170)
* functions that have no side effects: Function Attributes.
(line 6)
* functions that never return: Function Attributes.
(line 6)
* functions that pop the argument stack on the 386: Function Attributes.
(line 6)
* functions that pop the argument stack on the 386 <1>: Function Attributes.
(line 356)
* functions that pop the argument stack on the 386 <2>: Function Attributes.
(line 914)
* functions that return more than once: Function Attributes.
(line 6)
* functions which do not handle memory bank switching on 68HC11/68HC12: Function Attributes.
(line 641)
* functions which handle memory bank switching: Function Attributes.
(line 340)
* functions with non-null pointer arguments: Function Attributes.
(line 6)
* functions with 'printf', 'scanf', 'strftime' or 'strfmon' style arguments: Function Attributes.
(line 6)
* 'G' in constraint: Simple Constraints. (line 85)
* 'g' in constraint: Simple Constraints. (line 107)
* g++: Invoking G++. (line 14)
* G++: G++ and GCC. (line 30)
* gamma: Other Builtins. (line 6)
* gammaf: Other Builtins. (line 6)
* gammaf_r: Other Builtins. (line 6)
* gammal: Other Builtins. (line 6)
* gammal_r: Other Builtins. (line 6)
* gamma_r: Other Builtins. (line 6)
* GCC: G++ and GCC. (line 6)
* GCC command options: Invoking GCC. (line 6)
* GCC_EXEC_PREFIX: Environment Variables.
(line 52)
* 'gcc_struct': Type Attributes. (line 307)
* 'gcc_struct' attribute: Variable Attributes.
(line 332)
* 'gcov': Debugging Options. (line 257)
* gettext: Other Builtins. (line 6)
* global offset table: Code Gen Options. (line 172)
* global register after 'longjmp': Global Reg Vars. (line 66)
* global register variables: Global Reg Vars. (line 6)
* GNAT: G++ and GCC. (line 30)
* GNU C Compiler: G++ and GCC. (line 6)
* GNU Compiler Collection: G++ and GCC. (line 6)
* 'gnu_inline' function attribute: Function Attributes.
(line 93)
* goto with computed label: Labels as Values. (line 6)
* 'gprof': Debugging Options. (line 219)
* grouping options: Invoking GCC. (line 26)
* 'H' in constraint: Simple Constraints. (line 85)
* hardware models and configurations, specifying: Submodel Options.
(line 6)
* hex floats: Hex Floats. (line 6)
* 'hk' fixed-suffix: Fixed-Point. (line 6)
* 'HK' fixed-suffix: Fixed-Point. (line 6)
* hosted environment: Standards. (line 13)
* hosted environment <1>: C Dialect Options. (line 204)
* hosted environment <2>: C Dialect Options. (line 212)
* hosted implementation: Standards. (line 13)
* 'hot' function attribute: Function Attributes.
(line 768)
* HPPA Options: HPPA Options. (line 6)
* 'hr' fixed-suffix: Fixed-Point. (line 6)
* 'HR' fixed-suffix: Fixed-Point. (line 6)
* hypot: Other Builtins. (line 6)
* hypotf: Other Builtins. (line 6)
* hypotl: Other Builtins. (line 6)
* 'i' in constraint: Simple Constraints. (line 57)
* 'I' in constraint: Simple Constraints. (line 68)
* i386 Options: i386 and x86-64 Options.
(line 6)
* IA-64 Options: IA-64 Options. (line 6)
* IBM RS/6000 and PowerPC Options: RS/6000 and PowerPC Options.
(line 6)
* identifier names, dollar signs in: Dollar Signs. (line 6)
* identifiers, names in assembler code: Asm Labels. (line 6)
* ilogb: Other Builtins. (line 6)
* ilogbf: Other Builtins. (line 6)
* ilogbl: Other Builtins. (line 6)
* imaxabs: Other Builtins. (line 6)
* implementation-defined behavior, C language: C Implementation.
(line 6)
* implied '#pragma implementation': C++ Interface. (line 46)
* incompatibilities of GCC: Incompatibilities. (line 6)
* increment operators: Bug Criteria. (line 17)
* index: Other Builtins. (line 6)
* indirect calls on ARM: Function Attributes.
(line 549)
* indirect calls on MIPS: Function Attributes.
(line 571)
* initializations in expressions: Compound Literals. (line 6)
* initializers with labeled elements: Designated Inits. (line 6)
* initializers, non-constant: Initializers. (line 6)
* init_priority attribute: C++ Attributes. (line 9)
* 'inline' automatic for C++ member fns: Inline. (line 71)
* inline functions: Inline. (line 6)
* inline functions, omission of: Inline. (line 51)
* inlining and C++ pragmas: C++ Interface. (line 66)
* installation trouble: Trouble. (line 6)
* integrating function code: Inline. (line 6)
* Intel 386 Options: i386 and x86-64 Options.
(line 6)
* interface and implementation headers, C++: C++ Interface. (line 6)
* intermediate C version, nonexistent: G++ and GCC. (line 35)
* interrupt handler functions: Function Attributes.
(line 498)
* interrupt handler functions on the Blackfin, m68k, H8/300 and SH processors: Function Attributes.
(line 523)
* interrupt thread functions on fido: Function Attributes.
(line 530)
* introduction: Top. (line 6)
* invalid assembly code: Bug Criteria. (line 12)
* invalid input: Bug Criteria. (line 42)
* invoking 'g++': Invoking G++. (line 22)
* isalnum: Other Builtins. (line 6)
* isalpha: Other Builtins. (line 6)
* isascii: Other Builtins. (line 6)
* isblank: Other Builtins. (line 6)
* iscntrl: Other Builtins. (line 6)
* isdigit: Other Builtins. (line 6)
* isgraph: Other Builtins. (line 6)
* islower: Other Builtins. (line 6)
* ISO 9899: Standards. (line 13)
* ISO C: Standards. (line 13)
* ISO C standard: Standards. (line 13)
* ISO C90: Standards. (line 13)
* ISO C94: Standards. (line 13)
* ISO C95: Standards. (line 13)
* ISO C99: Standards. (line 13)
* ISO C9X: Standards. (line 13)
* ISO support: C Dialect Options. (line 10)
* ISO/IEC 9899: Standards. (line 13)
* isprint: Other Builtins. (line 6)
* ispunct: Other Builtins. (line 6)
* isspace: Other Builtins. (line 6)
* isupper: Other Builtins. (line 6)
* iswalnum: Other Builtins. (line 6)
* iswalpha: Other Builtins. (line 6)
* iswblank: Other Builtins. (line 6)
* iswcntrl: Other Builtins. (line 6)
* iswdigit: Other Builtins. (line 6)
* iswgraph: Other Builtins. (line 6)
* iswlower: Other Builtins. (line 6)
* iswprint: Other Builtins. (line 6)
* iswpunct: Other Builtins. (line 6)
* iswspace: Other Builtins. (line 6)
* iswupper: Other Builtins. (line 6)
* iswxdigit: Other Builtins. (line 6)
* isxdigit: Other Builtins. (line 6)
* j0: Other Builtins. (line 6)
* j0f: Other Builtins. (line 6)
* j0l: Other Builtins. (line 6)
* j1: Other Builtins. (line 6)
* j1f: Other Builtins. (line 6)
* j1l: Other Builtins. (line 6)
* Java: G++ and GCC. (line 6)
* java_interface attribute: C++ Attributes. (line 30)
* jn: Other Builtins. (line 6)
* jnf: Other Builtins. (line 6)
* jnl: Other Builtins. (line 6)
* 'k' fixed-suffix: Fixed-Point. (line 6)
* 'K' fixed-suffix: Fixed-Point. (line 6)
* keywords, alternate: Alternate Keywords. (line 6)
* known causes of trouble: Trouble. (line 6)
* 'l1_data' variable attribute: Variable Attributes.
(line 300)
* 'l1_data_A' variable attribute: Variable Attributes.
(line 300)
* 'l1_data_B' variable attribute: Variable Attributes.
(line 300)
* 'l1_text' function attribute: Function Attributes.
(line 543)
* labeled elements in initializers: Designated Inits. (line 6)
* labels as values: Labels as Values. (line 6)
* labs: Other Builtins. (line 6)
* LANG: Environment Variables.
(line 21)
* LANG <1>: Environment Variables.
(line 103)
* language dialect options: C Dialect Options. (line 6)
* LC_ALL: Environment Variables.
(line 21)
* LC_CTYPE: Environment Variables.
(line 21)
* LC_MESSAGES: Environment Variables.
(line 21)
* ldexp: Other Builtins. (line 6)
* ldexpf: Other Builtins. (line 6)
* ldexpl: Other Builtins. (line 6)
* length-zero arrays: Zero Length. (line 6)
* lgamma: Other Builtins. (line 6)
* lgammaf: Other Builtins. (line 6)
* lgammaf_r: Other Builtins. (line 6)
* lgammal: Other Builtins. (line 6)
* lgammal_r: Other Builtins. (line 6)
* lgamma_r: Other Builtins. (line 6)
* Libraries: Link Options. (line 24)
* LIBRARY_PATH: Environment Variables.
(line 94)
* link options: Link Options. (line 6)
* 'lk' fixed-suffix: Fixed-Point. (line 6)
* 'LK' fixed-suffix: Fixed-Point. (line 6)
* 'LL' integer suffix: Long Long. (line 6)
* llabs: Other Builtins. (line 6)
* 'llk' fixed-suffix: Fixed-Point. (line 6)
* 'LLK' fixed-suffix: Fixed-Point. (line 6)
* 'llr' fixed-suffix: Fixed-Point. (line 6)
* 'LLR' fixed-suffix: Fixed-Point. (line 6)
* llrint: Other Builtins. (line 6)
* llrintf: Other Builtins. (line 6)
* llrintl: Other Builtins. (line 6)
* llround: Other Builtins. (line 6)
* llroundf: Other Builtins. (line 6)
* llroundl: Other Builtins. (line 6)
* load address instruction: Simple Constraints. (line 141)
* local labels: Local Labels. (line 6)
* local variables in macros: Typeof. (line 42)
* local variables, specifying registers: Local Reg Vars. (line 6)
* locale: Environment Variables.
(line 21)
* locale definition: Environment Variables.
(line 103)
* log: Other Builtins. (line 6)
* log10: Other Builtins. (line 6)
* log10f: Other Builtins. (line 6)
* log10l: Other Builtins. (line 6)
* log1p: Other Builtins. (line 6)
* log1pf: Other Builtins. (line 6)
* log1pl: Other Builtins. (line 6)
* log2: Other Builtins. (line 6)
* log2f: Other Builtins. (line 6)
* log2l: Other Builtins. (line 6)
* logb: Other Builtins. (line 6)
* logbf: Other Builtins. (line 6)
* logbl: Other Builtins. (line 6)
* logf: Other Builtins. (line 6)
* logl: Other Builtins. (line 6)
* 'long long' data types: Long Long. (line 6)
* longjmp: Global Reg Vars. (line 66)
* 'longjmp' incompatibilities: Incompatibilities. (line 39)
* 'longjmp' warnings: Warning Options. (line 563)
* 'lr' fixed-suffix: Fixed-Point. (line 6)
* 'LR' fixed-suffix: Fixed-Point. (line 6)
* lrint: Other Builtins. (line 6)
* lrintf: Other Builtins. (line 6)
* lrintl: Other Builtins. (line 6)
* lround: Other Builtins. (line 6)
* lroundf: Other Builtins. (line 6)
* lroundl: Other Builtins. (line 6)
* 'm' in constraint: Simple Constraints. (line 17)
* M32C options: M32C Options. (line 6)
* M32R/D options: M32R/D Options. (line 6)
* M680x0 options: M680x0 Options. (line 6)
* M68hc1x options: M68hc1x Options. (line 6)
* machine dependent options: Submodel Options. (line 6)
* machine specific constraints: Machine Constraints.
(line 6)
* macro with variable arguments: Variadic Macros. (line 6)
* macros containing 'asm': Extended Asm. (line 239)
* macros, inline alternative: Inline. (line 6)
* macros, local labels: Local Labels. (line 6)
* macros, local variables in: Typeof. (line 42)
* macros, statements in expressions: Statement Exprs. (line 6)
* macros, types of arguments: Typeof. (line 6)
* make: Preprocessor Options.
(line 175)
* malloc: Other Builtins. (line 6)
* 'malloc' attribute: Function Attributes.
(line 581)
* matching constraint: Simple Constraints. (line 126)
* MCore options: MCore Options. (line 6)
* member fns, automatically 'inline': Inline. (line 71)
* memchr: Other Builtins. (line 6)
* memcmp: Other Builtins. (line 6)
* memcpy: Other Builtins. (line 6)
* memory references in constraints: Simple Constraints. (line 17)
* mempcpy: Other Builtins. (line 6)
* memset: Other Builtins. (line 6)
* Mercury: G++ and GCC. (line 23)
* message formatting: Language Independent Options.
(line 6)
* messages, warning: Warning Options. (line 6)
* messages, warning and error: Warnings and Errors.
(line 6)
* middle-operands, omitted: Conditionals. (line 6)
* MIPS options: MIPS Options. (line 6)
* 'mips16' attribute: Function Attributes.
(line 591)
* misunderstandings in C++: C++ Misunderstandings.
(line 6)
* mixed declarations and code: Mixed Declarations. (line 6)
* 'mktemp', and constant strings: Incompatibilities. (line 13)
* MMIX Options: MMIX Options. (line 6)
* MN10300 options: MN10300 Options. (line 6)
* 'mode' attribute: Variable Attributes.
(line 125)
* modf: Other Builtins. (line 6)
* modff: Other Builtins. (line 6)
* modfl: Other Builtins. (line 6)
* modifiers in constraints: Modifiers. (line 6)
* 'ms_struct': Type Attributes. (line 307)
* 'ms_struct' attribute: Variable Attributes.
(line 332)
* MT options: MT Options. (line 6)
* mudflap: Optimize Options. (line 328)
* multiple alternative constraints: Multi-Alternative. (line 6)
* multiprecision arithmetic: Long Long. (line 6)
* 'n' in constraint: Simple Constraints. (line 62)
* names used in assembler code: Asm Labels. (line 6)
* naming convention, implementation headers: C++ Interface. (line 46)
* nearbyint: Other Builtins. (line 6)
* nearbyintf: Other Builtins. (line 6)
* nearbyintl: Other Builtins. (line 6)
* nested functions: Nested Functions. (line 6)
* newlines (escaped): Escaped Newlines. (line 6)
* nextafter: Other Builtins. (line 6)
* nextafterf: Other Builtins. (line 6)
* nextafterl: Other Builtins. (line 6)
* nexttoward: Other Builtins. (line 6)
* nexttowardf: Other Builtins. (line 6)
* nexttowardl: Other Builtins. (line 6)
* NFC: Warning Options. (line 1043)
* NFKC: Warning Options. (line 1043)
* NMI handler functions on the Blackfin processor: Function Attributes.
(line 652)
* 'nocommon' attribute: Variable Attributes.
(line 99)
* 'noinline' function attribute: Function Attributes.
(line 663)
* 'nomips16' attribute: Function Attributes.
(line 591)
* non-constant initializers: Initializers. (line 6)
* non-static inline function: Inline. (line 85)
* 'nonnull' function attribute: Function Attributes.
(line 673)
* 'noreturn' function attribute: Function Attributes.
(line 696)
* 'nothrow' function attribute: Function Attributes.
(line 738)
* 'no_instrument_function' function attribute: Function Attributes.
(line 658)
* 'o' in constraint: Simple Constraints. (line 21)
* OBJC_INCLUDE_PATH: Environment Variables.
(line 127)
* Objective-C: G++ and GCC. (line 6)
* Objective-C <1>: Standards. (line 153)
* Objective-C and Objective-C++ options, command line: Objective-C and Objective-C++ Dialect Options.
(line 6)
* Objective-C++: G++ and GCC. (line 6)
* Objective-C++ <1>: Standards. (line 153)
* offsettable address: Simple Constraints. (line 21)
* old-style function definitions: Function Prototypes.
(line 6)
* omitted middle-operands: Conditionals. (line 6)
* open coding: Inline. (line 6)
* openmp parallel: C Dialect Options. (line 223)
* operand constraints, 'asm': Constraints. (line 6)
* optimize options: Optimize Options. (line 6)
* options to control diagnostics formatting: Language Independent Options.
(line 6)
* options to control warnings: Warning Options. (line 6)
* options, C++: C++ Dialect Options.
(line 6)
* options, code generation: Code Gen Options. (line 6)
* options, debugging: Debugging Options. (line 6)
* options, dialect: C Dialect Options. (line 6)
* options, directory search: Directory Options. (line 6)
* options, GCC command: Invoking GCC. (line 6)
* options, grouping: Invoking GCC. (line 26)
* options, linking: Link Options. (line 6)
* options, Objective-C and Objective-C++: Objective-C and Objective-C++ Dialect Options.
(line 6)
* options, optimization: Optimize Options. (line 6)
* options, order: Invoking GCC. (line 30)
* options, preprocessor: Preprocessor Options.
(line 6)
* order of evaluation, side effects: Non-bugs. (line 196)
* order of options: Invoking GCC. (line 30)
* other register constraints: Simple Constraints. (line 150)
* output file option: Overall Options. (line 182)
* overloaded virtual fn, warning: C++ Dialect Options.
(line 431)
* 'p' in constraint: Simple Constraints. (line 141)
* 'packed' attribute: Variable Attributes.
(line 136)
* parameter forward declaration: Variable Length. (line 60)
* parameters, aliased: Code Gen Options. (line 373)
* Pascal: G++ and GCC. (line 23)
* PDP-11 Options: PDP-11 Options. (line 6)
* PIC: Code Gen Options. (line 172)
* pmf: Bound member functions.
(line 6)
* pointer arguments: Function Attributes.
(line 181)
* pointer to member function: Bound member functions.
(line 6)
* portions of temporary objects, pointers to: Temporaries. (line 6)
* pow: Other Builtins. (line 6)
* pow10: Other Builtins. (line 6)
* pow10f: Other Builtins. (line 6)
* pow10l: Other Builtins. (line 6)
* PowerPC options: PowerPC Options. (line 6)
* powf: Other Builtins. (line 6)
* powl: Other Builtins. (line 6)
* pragma, align: Solaris Pragmas. (line 11)
* pragma, diagnostic: Diagnostic Pragmas. (line 14)
* pragma, extern_prefix: Symbol-Renaming Pragmas.
(line 19)
* pragma, fini: Solaris Pragmas. (line 20)
* pragma, init: Solaris Pragmas. (line 26)
* pragma, longcall: RS/6000 and PowerPC Pragmas.
(line 14)
* pragma, long_calls: ARM Pragmas. (line 11)
* pragma, long_calls_off: ARM Pragmas. (line 17)
* pragma, mark: Darwin Pragmas. (line 11)
* pragma, memregs: M32C Pragmas. (line 7)
* pragma, no_long_calls: ARM Pragmas. (line 14)
* pragma, options align: Darwin Pragmas. (line 14)
* pragma, reason for not using: Function Attributes.
(line 1110)
* pragma, redefine_extname: Symbol-Renaming Pragmas.
(line 13)
* pragma, segment: Darwin Pragmas. (line 21)
* pragma, unused: Darwin Pragmas. (line 24)
* pragma, visibility: Visibility Pragmas. (line 8)
* pragma, weak: Weak Pragmas. (line 10)
* pragmas: Pragmas. (line 6)
* pragmas in C++, effect on inlining: C++ Interface. (line 66)
* pragmas, interface and implementation: C++ Interface. (line 6)
* pragmas, warning of unknown: Warning Options. (line 581)
* precompiled headers: Precompiled Headers.
(line 6)
* preprocessing numbers: Incompatibilities. (line 173)
* preprocessing tokens: Incompatibilities. (line 173)
* preprocessor options: Preprocessor Options.
(line 6)
* printf: Other Builtins. (line 6)
* printf_unlocked: Other Builtins. (line 6)
* 'prof': Debugging Options. (line 213)
* 'progmem' variable attribute: Variable Attributes.
(line 487)
* promotion of formal parameters: Function Prototypes.
(line 6)
* 'pure' function attribute: Function Attributes.
(line 746)
* push address instruction: Simple Constraints. (line 141)
* putchar: Other Builtins. (line 6)
* puts: Other Builtins. (line 6)
* 'q' floating point suffix: Floating Types. (line 6)
* 'Q' floating point suffix: Floating Types. (line 6)
* 'qsort', and global register variables: Global Reg Vars. (line 42)
* question mark: Multi-Alternative. (line 27)
* 'r' fixed-suffix: Fixed-Point. (line 6)
* 'R' fixed-suffix: Fixed-Point. (line 6)
* 'r' in constraint: Simple Constraints. (line 53)
* ranges in case statements: Case Ranges. (line 6)
* read-only strings: Incompatibilities. (line 9)
* register variable after 'longjmp': Global Reg Vars. (line 66)
* registers: Extended Asm. (line 6)
* registers for local variables: Local Reg Vars. (line 6)
* registers in constraints: Simple Constraints. (line 53)
* registers, global allocation: Explicit Reg Vars. (line 6)
* registers, global variables in: Global Reg Vars. (line 6)
* 'regparm' attribute: Function Attributes.
(line 799)
* relocation truncated to fit (MIPS): MIPS Options. (line 179)
* remainder: Other Builtins. (line 6)
* remainderf: Other Builtins. (line 6)
* remainderl: Other Builtins. (line 6)
* remquo: Other Builtins. (line 6)
* remquof: Other Builtins. (line 6)
* remquol: Other Builtins. (line 6)
* reordering, warning: C++ Dialect Options.
(line 354)
* reporting bugs: Bugs. (line 6)
* rest argument (in macro): Variadic Macros. (line 6)
* restricted pointers: Restricted Pointers.
(line 6)
* restricted references: Restricted Pointers.
(line 6)
* restricted this pointer: Restricted Pointers.
(line 6)
* 'returns_twice' attribute: Function Attributes.
(line 836)
* rindex: Other Builtins. (line 6)
* rint: Other Builtins. (line 6)
* rintf: Other Builtins. (line 6)
* rintl: Other Builtins. (line 6)
* round: Other Builtins. (line 6)
* roundf: Other Builtins. (line 6)
* roundl: Other Builtins. (line 6)
* RS/6000 and PowerPC Options: RS/6000 and PowerPC Options.
(line 6)
* RTTI: Vague Linkage. (line 42)
* run-time options: Code Gen Options. (line 6)
* 's' in constraint: Simple Constraints. (line 89)
* S/390 and zSeries Options: S/390 and zSeries Options.
(line 6)
* save all registers on the Blackfin, H8/300, H8/300H, and H8S: Function Attributes.
(line 845)
* scalb: Other Builtins. (line 6)
* scalbf: Other Builtins. (line 6)
* scalbl: Other Builtins. (line 6)
* scalbln: Other Builtins. (line 6)
* scalblnf: Other Builtins. (line 6)
* scalblnf <1>: Other Builtins. (line 6)
* scalbn: Other Builtins. (line 6)
* scalbnf: Other Builtins. (line 6)
* 'scanf', and constant strings: Incompatibilities. (line 17)
* scanfnl: Other Builtins. (line 6)
* scope of a variable length array: Variable Length. (line 23)
* scope of declaration: Disappointments. (line 21)
* scope of external declarations: Incompatibilities. (line 80)
* Score Options: Score Options. (line 6)
* search path: Directory Options. (line 6)
* 'section' function attribute: Function Attributes.
(line 850)
* 'section' variable attribute: Variable Attributes.
(line 151)
* 'sentinel' function attribute: Function Attributes.
(line 866)
* setjmp: Global Reg Vars. (line 66)
* 'setjmp' incompatibilities: Incompatibilities. (line 39)
* shared strings: Incompatibilities. (line 9)
* 'shared' variable attribute: Variable Attributes.
(line 196)
* side effect in ?:: Conditionals. (line 20)
* side effects, macro argument: Statement Exprs. (line 35)
* side effects, order of evaluation: Non-bugs. (line 196)
* signal handler functions on the AVR processors: Function Attributes.
(line 897)
* signbit: Other Builtins. (line 6)
* signbitd128: Other Builtins. (line 6)
* signbitd32: Other Builtins. (line 6)
* signbitd64: Other Builtins. (line 6)
* signbitf: Other Builtins. (line 6)
* signbitl: Other Builtins. (line 6)
* signed and unsigned values, comparison warning: Warning Options.
(line 912)
* significand: Other Builtins. (line 6)
* significandf: Other Builtins. (line 6)
* significandl: Other Builtins. (line 6)
* simple constraints: Simple Constraints. (line 6)
* sin: Other Builtins. (line 6)
* sincos: Other Builtins. (line 6)
* sincosf: Other Builtins. (line 6)
* sincosl: Other Builtins. (line 6)
* sinf: Other Builtins. (line 6)
* sinh: Other Builtins. (line 6)
* sinhf: Other Builtins. (line 6)
* sinhl: Other Builtins. (line 6)
* sinl: Other Builtins. (line 6)
* sizeof: Typeof. (line 6)
* smaller data references: M32R/D Options. (line 57)
* smaller data references (PowerPC): RS/6000 and PowerPC Options.
(line 626)
* snprintf: Other Builtins. (line 6)
* SPARC options: SPARC Options. (line 6)
* Spec Files: Spec Files. (line 6)
* specified registers: Explicit Reg Vars. (line 6)
* specifying compiler version and target machine: Target Options.
(line 6)
* specifying hardware config: Submodel Options. (line 6)
* specifying machine version: Target Options. (line 6)
* specifying registers for local variables: Local Reg Vars. (line 6)
* speed of compilation: Precompiled Headers.
(line 6)
* sprintf: Other Builtins. (line 6)
* SPU options: SPU Options. (line 6)
* sqrt: Other Builtins. (line 6)
* sqrtf: Other Builtins. (line 6)
* sqrtl: Other Builtins. (line 6)
* sscanf: Other Builtins. (line 6)
* 'sscanf', and constant strings: Incompatibilities. (line 17)
* 'sseregparm' attribute: Function Attributes.
(line 816)
* statements inside expressions: Statement Exprs. (line 6)
* static data in C++, declaring and defining: Static Definitions.
(line 6)
* stpcpy: Other Builtins. (line 6)
* stpncpy: Other Builtins. (line 6)
* strcasecmp: Other Builtins. (line 6)
* strcat: Other Builtins. (line 6)
* strchr: Other Builtins. (line 6)
* strcmp: Other Builtins. (line 6)
* strcpy: Other Builtins. (line 6)
* strcspn: Other Builtins. (line 6)
* strdup: Other Builtins. (line 6)
* strfmon: Other Builtins. (line 6)
* strftime: Other Builtins. (line 6)
* string constants: Incompatibilities. (line 9)
* strlen: Other Builtins. (line 6)
* strncasecmp: Other Builtins. (line 6)
* strncat: Other Builtins. (line 6)
* strncmp: Other Builtins. (line 6)
* strncpy: Other Builtins. (line 6)
* strndup: Other Builtins. (line 6)
* strpbrk: Other Builtins. (line 6)
* strrchr: Other Builtins. (line 6)
* strspn: Other Builtins. (line 6)
* strstr: Other Builtins. (line 6)
* struct: Unnamed Fields. (line 6)
* structures: Incompatibilities. (line 146)
* structures, constructor expression: Compound Literals. (line 6)
* submodel options: Submodel Options. (line 6)
* subscripting: Subscripting. (line 6)
* subscripting and function values: Subscripting. (line 6)
* suffixes for C++ source: Invoking G++. (line 6)
* SUNPRO_DEPENDENCIES: Environment Variables.
(line 167)
* suppressing warnings: Warning Options. (line 6)
* surprises in C++: C++ Misunderstandings.
(line 6)
* syntax checking: Warning Options. (line 13)
* system headers, warnings from: Warning Options. (line 693)
* tan: Other Builtins. (line 6)
* tanf: Other Builtins. (line 6)
* tanh: Other Builtins. (line 6)
* tanhf: Other Builtins. (line 6)
* tanhl: Other Builtins. (line 6)
* tanl: Other Builtins. (line 6)
* target machine, specifying: Target Options. (line 6)
* target options: Target Options. (line 6)
* TC1: Standards. (line 13)
* TC2: Standards. (line 13)
* TC3: Standards. (line 13)
* Technical Corrigenda: Standards. (line 13)
* Technical Corrigendum 1: Standards. (line 13)
* Technical Corrigendum 2: Standards. (line 13)
* Technical Corrigendum 3: Standards. (line 13)
* template instantiation: Template Instantiation.
(line 6)
* temporaries, lifetime of: Temporaries. (line 6)
* tgamma: Other Builtins. (line 6)
* tgammaf: Other Builtins. (line 6)
* tgammal: Other Builtins. (line 6)
* Thread-Local Storage: Thread-Local. (line 6)
* thunks: Nested Functions. (line 6)
* tiny data section on the H8/300H and H8S: Function Attributes.
(line 919)
* TLS: Thread-Local. (line 6)
* 'tls_model' attribute: Variable Attributes.
(line 219)
* TMPDIR: Environment Variables.
(line 45)
* toascii: Other Builtins. (line 6)
* tolower: Other Builtins. (line 6)
* toupper: Other Builtins. (line 6)
* towlower: Other Builtins. (line 6)
* towupper: Other Builtins. (line 6)
* traditional C language: C Dialect Options. (line 253)
* treelang: G++ and GCC. (line 6)
* treelang <1>: Standards. (line 167)
* trunc: Other Builtins. (line 6)
* truncf: Other Builtins. (line 6)
* truncl: Other Builtins. (line 6)
* two-stage name lookup: Name lookup. (line 6)
* type alignment: Alignment. (line 6)
* type attributes: Type Attributes. (line 6)
* typedef names as function parameters: Incompatibilities. (line 97)
* typeof: Typeof. (line 6)
* type_info: Vague Linkage. (line 42)
* 'uhk' fixed-suffix: Fixed-Point. (line 6)
* 'UHK' fixed-suffix: Fixed-Point. (line 6)
* 'uhr' fixed-suffix: Fixed-Point. (line 6)
* 'UHR' fixed-suffix: Fixed-Point. (line 6)
* 'uk' fixed-suffix: Fixed-Point. (line 6)
* 'UK' fixed-suffix: Fixed-Point. (line 6)
* 'ulk' fixed-suffix: Fixed-Point. (line 6)
* 'ULK' fixed-suffix: Fixed-Point. (line 6)
* 'ULL' integer suffix: Long Long. (line 6)
* 'ullk' fixed-suffix: Fixed-Point. (line 6)
* 'ULLK' fixed-suffix: Fixed-Point. (line 6)
* 'ullr' fixed-suffix: Fixed-Point. (line 6)
* 'ULLR' fixed-suffix: Fixed-Point. (line 6)
* 'ulr' fixed-suffix: Fixed-Point. (line 6)
* 'ULR' fixed-suffix: Fixed-Point. (line 6)
* undefined behavior: Bug Criteria. (line 17)
* undefined function value: Bug Criteria. (line 17)
* underscores in variables in macros: Typeof. (line 42)
* union: Unnamed Fields. (line 6)
* union, casting to a: Cast to Union. (line 6)
* unions: Incompatibilities. (line 146)
* unknown pragmas, warning: Warning Options. (line 581)
* unresolved references and '-nodefaultlibs': Link Options. (line 79)
* unresolved references and '-nostdlib': Link Options. (line 79)
* 'unused' attribute.: Function Attributes.
(line 931)
* 'ur' fixed-suffix: Fixed-Point. (line 6)
* 'UR' fixed-suffix: Fixed-Point. (line 6)
* 'used' attribute.: Function Attributes.
(line 936)
* User stack pointer in interrupts on the Blackfin: Function Attributes.
(line 538)
* 'V' in constraint: Simple Constraints. (line 41)
* V850 Options: V850 Options. (line 6)
* vague linkage: Vague Linkage. (line 6)
* value after 'longjmp': Global Reg Vars. (line 66)
* variable addressability on the IA-64: Function Attributes.
(line 606)
* variable addressability on the M32R/D: Variable Attributes.
(line 313)
* variable alignment: Alignment. (line 6)
* variable attributes: Variable Attributes.
(line 6)
* variable number of arguments: Variadic Macros. (line 6)
* variable-length array scope: Variable Length. (line 23)
* variable-length arrays: Variable Length. (line 6)
* variables in specified registers: Explicit Reg Vars. (line 6)
* variables, local, in macros: Typeof. (line 42)
* variadic macros: Variadic Macros. (line 6)
* VAX options: VAX Options. (line 6)
* 'version_id' attribute on IA64 HP-UX: Function Attributes.
(line 942)
* vfprintf: Other Builtins. (line 6)
* vfscanf: Other Builtins. (line 6)
* 'visibility' attribute: Function Attributes.
(line 952)
* VLAs: Variable Length. (line 6)
* void pointers, arithmetic: Pointer Arith. (line 6)
* void, size of pointer to: Pointer Arith. (line 6)
* volatile access: Volatiles. (line 6)
* 'volatile' applied to function: Function Attributes.
(line 6)
* volatile read: Volatiles. (line 6)
* volatile write: Volatiles. (line 6)
* vprintf: Other Builtins. (line 6)
* vscanf: Other Builtins. (line 6)
* vsnprintf: Other Builtins. (line 6)
* vsprintf: Other Builtins. (line 6)
* vsscanf: Other Builtins. (line 6)
* vtable: Vague Linkage. (line 27)
* VxWorks Options: VxWorks Options. (line 6)
* 'w' floating point suffix: Floating Types. (line 6)
* 'W' floating point suffix: Floating Types. (line 6)
* warning for comparison of signed and unsigned values: Warning Options.
(line 912)
* warning for overloaded virtual fn: C++ Dialect Options.
(line 431)
* warning for reordering of member initializers: C++ Dialect Options.
(line 354)
* warning for unknown pragmas: Warning Options. (line 581)
* 'warning' function attribute: Function Attributes.
(line 158)
* warning messages: Warning Options. (line 6)
* warnings from system headers: Warning Options. (line 693)
* warnings vs errors: Warnings and Errors.
(line 6)
* 'warn_unused_result' attribute: Function Attributes.
(line 1044)
* 'weak' attribute: Function Attributes.
(line 1061)
* 'weakref' attribute: Function Attributes.
(line 1070)
* whitespace: Incompatibilities. (line 112)
* 'X' in constraint: Simple Constraints. (line 111)
* X3.159-1989: Standards. (line 13)
* x86-64 Options: i386 and x86-64 Options.
(line 6)
* x86-64 options: x86-64 Options. (line 6)
* Xstormy16 Options: Xstormy16 Options. (line 6)
* Xtensa Options: Xtensa Options. (line 6)
* y0: Other Builtins. (line 6)
* y0f: Other Builtins. (line 6)
* y0l: Other Builtins. (line 6)
* y1: Other Builtins. (line 6)
* y1f: Other Builtins. (line 6)
* y1l: Other Builtins. (line 6)
* yn: Other Builtins. (line 6)
* ynf: Other Builtins. (line 6)
* ynl: Other Builtins. (line 6)
* zero-length arrays: Zero Length. (line 6)
* zero-size structures: Empty Structures. (line 6)
* zSeries options: zSeries Options. (line 6)

Tag Table:
Node: Top2087
Node: G++ and GCC3785
Node: Standards5838
Node: Invoking GCC15136
Node: Option Summary18953
Node: Overall Options49773
Node: Invoking G++63305
Node: C Dialect Options64828
Node: C++ Dialect Options78711
Node: Objective-C and Objective-C++ Dialect Options99407
Node: Language Independent Options111186
Node: Warning Options113953
Node: Debugging Options170465
Node: Optimize Options207371
Ref: Type-punning246826
Node: Preprocessor Options300443
Ref: Wtrigraphs304529
Ref: dashMF309335
Ref: fdollars-in-identifiers319863
Node: Assembler Options328069
Node: Link Options328773
Ref: Link Options-Footnote-1337339
Node: Directory Options337675
Node: Spec Files343723
Node: Target Options364010
Node: Submodel Options365434
Node: ARC Options367074
Node: ARM Options368263
Node: AVR Options380179
Node: Blackfin Options382312
Node: CRIS Options388350
Node: CRX Options392559
Node: Darwin Options392986
Node: DEC Alpha Options400474
Node: DEC Alpha/VMS Options411979
Node: FRV Options412364
Node: GNU/Linux Options419135
Node: H8/300 Options419593
Node: HPPA Options420660
Node: i386 and x86-64 Options430248
Node: IA-64 Options457118
Node: M32C Options464425
Node: M32R/D Options465715
Node: M680x0 Options469301
Node: M68hc1x Options481878
Node: MCore Options483445
Node: MIPS Options484466
Node: MMIX Options506660
Node: MN10300 Options509137
Node: MT Options510555
Node: PDP-11 Options511468
Node: PowerPC Options513302
Node: RS/6000 and PowerPC Options513536
Node: S/390 and zSeries Options542945
Node: Score Options550870
Node: SH Options551705
Node: SPARC Options561547
Node: SPU Options572510
Node: System V Options575801
Node: V850 Options576624
Node: VAX Options579763
Node: VxWorks Options580311
Node: x86-64 Options581466
Node: Xstormy16 Options581684
Node: Xtensa Options581973
Node: zSeries Options585813
Node: Code Gen Options586009
Node: Environment Variables608761
Node: Precompiled Headers616660
Node: Running Protoize622897
Node: C Implementation629234
Node: Translation implementation630898
Node: Environment implementation631471
Node: Identifiers implementation632020
Node: Characters implementation633073
Node: Integers implementation635879
Node: Floating point implementation637703
Node: Arrays and pointers implementation640630
Ref: Arrays and pointers implementation-Footnote-1642066
Node: Hints implementation642192
Node: Structures unions enumerations and bit-fields implementation643656
Node: Qualifiers implementation645641
Node: Declarators implementation647413
Node: Statements implementation647754
Node: Preprocessing directives implementation648080
Node: Library functions implementation650184
Node: Architecture implementation650823
Node: Locale-specific behavior implementation651525
Node: C Extensions651830
Node: Statement Exprs656383
Node: Local Labels660896
Node: Labels as Values663875
Ref: Labels as Values-Footnote-1666250
Node: Nested Functions666435
Node: Constructing Calls670329
Node: Typeof675052
Node: Conditionals678218
Node: Long Long679108
Node: Complex680609
Node: Floating Types683178
Node: Decimal Float684297
Node: Hex Floats685869
Node: Fixed-Point686911
Node: Zero Length690041
Node: Empty Structures693320
Node: Variable Length693732
Node: Variadic Macros696503
Node: Escaped Newlines698884
Node: Subscripting699723
Node: Pointer Arith700446
Node: Initializers701014
Node: Compound Literals701510
Node: Designated Inits703685
Node: Case Ranges707338
Node: Cast to Union708019
Node: Mixed Declarations709117
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Node: Attribute Syntax763117
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Node: C++ Comments775166
Node: Dollar Signs775685
Node: Character Escapes776150
Node: Alignment776434
Node: Variable Attributes777823
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Node: Type Attributes797728
Ref: i386 Type Attributes811403
Ref: PowerPC Type Attributes812234
Ref: SPU Type Attributes813087
Node: Inline813378
Node: Extended Asm818334
Ref: Example of asm with clobbered asm reg824421
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Node: Simple Constraints839366
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Node: Function Names895005
Node: Return Address897196
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Node: Offsetof903497
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Node: Object Size Checking909355
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Node: Paired-Single Arithmetic1221685
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Node: ARM Pragmas1336871
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Node: C99 Thread-Local Edits1352405
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Node: Binary constants1357849
Node: C++ Extensions1358520
Node: Volatiles1360153
Node: Restricted Pointers1362828
Node: Vague Linkage1364422
Node: C++ Interface1368067
Ref: C++ Interface-Footnote-11372366
Node: Template Instantiation1372505
Node: Bound member functions1379515
Node: C++ Attributes1381058
Node: Namespace Association1382716
Node: Type Traits1384131
Node: Java Exceptions1389689
Node: Deprecated Features1391086
Node: Backwards Compatibility1394052
Node: Objective-C1395408
Node: Executing code before main1395989
Node: What you can and what you cannot do in +load1398597
Node: Type encoding1400762
Node: Garbage Collection1404101
Node: Constant string objects1406726
Node: compatibility_alias1409235
Node: Compatibility1410112
Node: Gcov1416668
Node: Gcov Intro1417192
Node: Invoking Gcov1419908
Node: Gcov and Optimization1431759
Node: Gcov Data Files1434413
Node: Cross-profiling1435551
Node: Trouble1437382
Node: Actual Bugs1438922
Node: Cross-Compiler Problems1439657
Node: Interoperation1440071
Node: Incompatibilities1447207
Node: Fixed Headers1455358
Node: Standard Libraries1457016
Node: Disappointments1458388
Node: C++ Misunderstandings1462747
Node: Static Definitions1463566
Node: Name lookup1464619
Ref: Name lookup-Footnote-11469399
Node: Temporaries1469588
Node: Copy Assignment1471564
Node: Protoize Caveats1473371
Node: Non-bugs1477340
Node: Warnings and Errors1487843
Node: Bugs1489607
Node: Bug Criteria1490171
Node: Bug Reporting1492381
Node: Service1492602
Node: Contributing1493421
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Node: GNU Project1496651
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Node: GNU Free Documentation License1534806
Node: Contributors1557193
Node: Option Index1593389
Node: Keyword Index1747897

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