| /* Copyright (C) 2007 ARC International (UK) LTD */ |
| |
| /* Code was copied from ARC GCC toolchain, ucLibc packet (GPL) */ |
| |
| #include "newlib_asm.h" |
| |
| #ifndef __A4__ /* Mostly optimized for ARC700, |
| but not bad for ARC600 either. */ |
| /* This memcpy implementation does not support objects of 1GB or larger - |
| the check for alignment does not work then. */ |
| /* We assume that most sources and destinations are aligned, and |
| that also lengths are mostly a multiple of four, although to a lesser |
| extent. */ |
| ENTRY(memcpy) |
| or r3,r0,r1 |
| asl_s r3,r3,30 |
| mov_s r5,r0 |
| brls.d r2,r3,.Lcopy_bytewise |
| sub.f r3,r2,1 |
| ld_s r12,[r1,0] |
| asr.f lp_count,r3,3 |
| bbit0.d r3,2,.Lnox4 |
| bmsk_s r2,r2,1 |
| st.ab r12,[r5,4] |
| ld.a r12,[r1,4] |
| .Lnox4: |
| lppnz .Lendloop |
| ld_s r3,[r1,4] |
| st.ab r12,[r5,4] |
| ld.a r12,[r1,8] |
| st.ab r3,[r5,4] |
| .Lendloop: |
| breq_l r2,0,.Last_store |
| ld r3,[r5,0] |
| #ifdef __LITTLE_ENDIAN__ |
| add3 r2,-1,r2 |
| ; uses long immediate |
| xor_s r12,r12,r3 |
| bmsk r12,r12,r2 |
| xor_s r12,r12,r3 |
| #else /* BIG ENDIAN */ |
| sub3 r2,31,r2 |
| ; uses long immediate |
| xor_s r3,r3,r12 |
| bmsk r3,r3,r2 |
| xor_s r12,r12,r3 |
| #endif /* ENDIAN */ |
| .Last_store: |
| j_s.d [blink] |
| st r12,[r5,0] |
| |
| .balign 4 |
| .Lcopy_bytewise: |
| jcs [blink] |
| ldb_s r12,[r1,0] |
| lsr.f lp_count,r3 |
| bcc_s .Lnox1 |
| stb.ab r12,[r5,1] |
| ldb.a r12,[r1,1] |
| .Lnox1: |
| lppnz .Lendbloop |
| ldb_s r3,[r1,1] |
| stb.ab r12,[r5,1] |
| ldb.a r12,[r1,2] |
| stb.ab r3,[r5,1] |
| .Lendbloop: |
| j_s.d [blink] |
| stb r12,[r5,0] |
| ENDFUNC(memcpy) |
| #endif /* !__A4__ */ |
