| /* $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 |