/* $OpenBSD: bcmp.S,v 1.3 2005/08/07 11:30:38 espie Exp $ */ | |
/* | |
* Written by J.T. Conklin <jtc@netbsd.org>. | |
* Public domain. | |
*/ | |
#include <machine/asm.h> | |
ENTRY(bcmp) | |
pushl %edi | |
pushl %esi | |
movl 12(%esp),%edi | |
movl 16(%esp),%esi | |
xorl %eax,%eax /* clear return value */ | |
cld /* set compare direction forward */ | |
movl 20(%esp),%ecx /* compare by words */ | |
shrl $2,%ecx | |
repe | |
cmpsl | |
jne L1 | |
movl 20(%esp),%ecx /* compare remainder by bytes */ | |
andl $3,%ecx | |
repe | |
cmpsb | |
je L2 | |
L1: incl %eax | |
L2: popl %esi | |
popl %edi | |
ret |