newlib-cygwin/newlib/libc/machine/i386/memcmp.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 (memcmp)
SOTYPE_FUNCTION(memcmp)
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SYM (memcmp):
#ifdef __iamcu__
pushl edi
pushl esi
movl eax,edi
movl edx,esi
cld
/* check if length is zero in which case just return 0 */
xorl eax,eax
testl ecx,ecx
jz L4
/* compare any unaligned bytes or remainder bytes */
repz
cmpsb
/* set output to be < 0 if less than, 0 if equal, or > 0 if greater than */
xorl edx,edx
movb -1(esi),dl
movb -1(edi),al
subl edx,eax
L4:
popl esi
popl edi
#else
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pushl ebp
movl esp,ebp
subl $16,esp
pushl ebx
pushl edi
pushl esi
movl 8(ebp),edi
movl 12(ebp),esi
movl 16(ebp),ecx
cld
/* check if length is zero in which case just return 0 */
xorl eax,eax
testl ecx,ecx
jz L4
#ifndef __OPTIMIZE_SIZE__
/* if aligned on long boundary, compare doublewords at a time first */
movl edi,eax
orl esi,eax
testb $3,al
jne BYTECMP
movl ecx,ebx
shrl $2,ecx /* calculate number of long words to compare */
repz
cmpsl
jz L5
subl $4,esi
subl $4,edi
movl $4,ecx
jmp BYTECMP
L5:
andl $3,ebx /* calculate number of remaining bytes */
movl ebx,ecx
#endif /* not __OPTIMIZE_SIZE__ */
BYTECMP: /* compare any unaligned bytes or remainder bytes */
repz
cmpsb
/* set output to be < 0 if less than, 0 if equal, or > 0 if greater than */
L3:
xorl edx,edx
movb -1(esi),dl
xorl eax,eax
movb -1(edi),al
subl edx,eax
L4:
leal -28(ebp),esp
popl esi
popl edi
popl ebx
leave
#endif
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ret