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

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/*
* ====================================================
2002-12-20 Jeff Johnston <jjohnstn@redhat.com> * libc/machine/i386/f_atan2.S: Change copyright from Cygnus Solutions to Red Hat Inc. * libc/machine/i386/f_atan2f.S: Ditto. * libc/machine/i386/f_exp.c: Ditto. * libc/machine/i386/f_expf.c: Ditto. * libc/machine/i386/f_frexp.S: Ditto. * libc/machine/i386/f_frexpf.S: Ditto. * libc/machine/i386/f_ldexp.S: Ditto. * libc/machine/i386/f_ldexpf.S: Ditto. * libc/machine/i386/f_log.S: Ditto. * libc/machine/i386/f_log10.S: Ditto. * libc/machine/i386/f_log10f.S: Ditto. * libc/machine/i386/f_logf.S: Ditto. * libc/machine/i386/f_pow.c: Ditto. * libc/machine/i386/f_powf.c: Ditto. * libc/machine/i386/f_tan.S: Ditto. * libc/machine/i386/f_tanf.S: Ditto. * libc/machine/i386/memchr.S: Ditto. * libc/machine/i386/memcmp.S: Ditto. * libc/machine/i386/memcpy.S: Ditto. * libc/machine/i386/memmove.S: Ditto. * libc/machine/i386/memset.S: Ditto. * libc/machine/i386/strchr.S: Ditto. * libc/machine/i386/strlen.S: Ditto. * libm/machine/i386/f_atan2.S: Ditto. * libm/machine/i386/f_atan2f.S: Ditto. * libm/machine/i386/f_exp.c: Ditto. * libm/machine/i386/f_expf.c: Ditto. * libm/machine/i386/f_frexp.S: Ditto. * libm/machine/i386/f_frexpf.S: Ditto. * libm/machine/i386/f_ldexp.S: Ditto. * libm/machine/i386/f_ldexpf.S: Ditto. * libm/machine/i386/f_log.S: Ditto. * libm/machine/i386/f_log10.S: Ditto. * libm/machine/i386/f_log10f.S: Ditto. * libm/machine/i386/f_logf.S: Ditto. * libm/machine/i386/f_pow.c: Ditto. * libm/machine/i386/f_powf.c: Ditto. * libm/machine/i386/f_tan.S: Ditto. * libm/machine/i386/f_tanf.S: Ditto.
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* Copyright (C) 1998, 2002 by Red Hat Inc. All rights reserved.
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*
* Permission to use, copy, modify, and distribute this
* software is freely granted, provided that this notice
* is preserved.
* ====================================================
*/
#include "i386mach.h"
.global SYM (memmove)
SOTYPE_FUNCTION(memmove)
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SYM (memmove):
pushl ebp
movl esp,ebp
pushl esi
pushl edi
pushl ebx
movl 8(ebp),edi
movl 16(ebp),ecx
movl 12(ebp),esi
/* check for destructive overlap (src < dst && dst < src + length) */
cld
cmpl edi,esi
jae .L2
leal -1(ecx,esi),ebx
cmpl ebx,edi
ja .L2
/* IF: destructive overlap, must copy backwards */
addl ecx,esi
addl ecx,edi
std
#ifndef __OPTIMIZE_SIZE__
cmpl $8,ecx
jbe .L13
.L18:
/* move trailing bytes in reverse until destination address is long word aligned */
movl edi,edx
movl ecx,ebx
andl $3,edx
jz .L21
movl edx,ecx
decl esi
decl edi
subl ecx,ebx
rep
movsb
mov ebx,ecx
incl esi
incl edi
.L21:
/* move bytes in reverse, a long word at a time */
shrl $2,ecx
subl $4,esi
subl $4,edi
rep
movsl
addl $4,esi
addl $4,edi
movl ebx,ecx
andl $3,ecx
#endif /* !__OPTIMIZE_SIZE__ */
/* handle any remaining bytes not on a long word boundary */
.L13:
decl esi
decl edi
.L15:
rep
movsb
jmp .L5
.p2align 4,,7
/* ELSE: no destructive overlap so we copy forwards */
.L2:
#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
cld
leal -12(ebp),esp
popl ebx
popl edi
popl esi
leave
ret