1/* $OpenBSD: bcmp.S,v 1.2 1996/09/27 06:47:44 mickey Exp $ */ 2 3/* 4 * Written by J.T. Conklin <jtc@netbsd.org>. 5 * Public domain. 6 */ 7 8#include <machine/asm.h> 9 10ENTRY(bcmp) 11 pushl %edi 12 pushl %esi 13 movl 12(%esp),%edi 14 movl 16(%esp),%esi 15 xorl %eax,%eax /* clear return value */ 16 cld /* set compare direction forward */ 17 18 movl 20(%esp),%ecx /* compare by words */ 19 shrl $2,%ecx 20 repe 21 cmpsl 22 jne L1 23 24 movl 20(%esp),%ecx /* compare remainder by bytes */ 25 andl $3,%ecx 26 repe 27 cmpsb 28 je L2 29 30L1: incl %eax 31L2: popl %esi 32 popl %edi 33 ret 34