| /* Definitions for branch prediction routines in the GNU compiler. |
| Copyright (C) 2001-2014 Free Software Foundation, Inc. |
| |
| This file is part of GCC. |
| |
| GCC 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, or (at your option) any later |
| version. |
| |
| GCC 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 GCC; see the file COPYING3. If not see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #ifndef GCC_PREDICT_H |
| #define GCC_PREDICT_H |
| |
| /* Random guesstimation given names. |
| PROB_VERY_UNLIKELY should be small enough so basic block predicted |
| by it gets below HOT_BB_FREQUENCY_FRACTION. */ |
| #define PROB_VERY_UNLIKELY (REG_BR_PROB_BASE / 2000 - 1) |
| #define PROB_EVEN (REG_BR_PROB_BASE / 2) |
| #define PROB_VERY_LIKELY (REG_BR_PROB_BASE - PROB_VERY_UNLIKELY) |
| #define PROB_ALWAYS (REG_BR_PROB_BASE) |
| #define PROB_UNLIKELY (REG_BR_PROB_BASE / 5 - 1) |
| #define PROB_LIKELY (REG_BR_PROB_BASE - PROB_UNLIKELY) |
| |
| #define DEF_PREDICTOR(ENUM, NAME, HITRATE, FLAGS) ENUM, |
| enum br_predictor |
| { |
| #include "predict.def" |
| |
| /* Upper bound on non-language-specific builtins. */ |
| END_PREDICTORS |
| }; |
| #undef DEF_PREDICTOR |
| enum prediction |
| { |
| NOT_TAKEN, |
| TAKEN |
| }; |
| |
| extern void predict_insn_def (rtx, enum br_predictor, enum prediction); |
| extern int counts_to_freqs (void); |
| extern void handle_missing_profiles (void); |
| extern void estimate_bb_frequencies (bool); |
| extern const char *predictor_name (enum br_predictor); |
| extern tree build_predict_expr (enum br_predictor, enum prediction); |
| extern void tree_estimate_probability (void); |
| extern void compute_function_frequency (void); |
| extern void rebuild_frequencies (void); |
| |
| #endif /* GCC_PREDICT_H */ |
