newlib-cygwin/newlib/libc/machine/i386/memcpy.S

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2000-02-18 03:39:52 +08:00
/*
* ====================================================
* Copyright (C) 1998 by Cygnus Solutions. All rights reserved.
*
* Permission to use, copy, modify, and distribute this
* software is freely granted, provided that this notice
* is preserved.
* ====================================================
*/
#include "i386mach.h"
.global SYM (memcpy)
SOTYPE_FUNCTION(memcpy)
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SYM (memcpy):
pushl ebp
movl esp,ebp
pushl esi
pushl edi
pushl ebx
movl 8(ebp),edi
movl 16(ebp),ecx
movl 12(ebp),esi
cld
#ifndef __OPTIMIZE_SIZE__
cmpl $8,ecx
jbe .L3
/* move any preceding bytes until destination address is long word aligned */
movl edi,edx
movl ecx,ebx
andl $3,edx
jz .L11
movl $4,ecx
subl edx,ecx
andl $3,ecx
subl ecx,ebx
rep
movsb
mov ebx,ecx
/* move bytes a long word at a time */
.L11:
shrl $2,ecx
.p2align 2
rep
movsl
movl ebx,ecx
andl $3,ecx
#endif /* !__OPTIMIZE_SIZE__ */
/* handle any remaining bytes */
.L3:
rep
movsb
.L5:
movl 8(ebp),eax
leal -12(ebp),esp
popl ebx
popl edi
popl esi
leave
ret