1 /* $OpenBSD: bcmp.S,v 1.3 2005/08/07 11:30:38 espie Exp $ */ 2 /* 3 * Written by J.T. Conklin <jtc (at) netbsd.org>. 4 * Public domain. 5 */ 6 7 #include <machine/asm.h> 8 9 ENTRY(bcmp) 10 pushl %edi 11 pushl %esi 12 movl 12(%esp),%edi 13 movl 16(%esp),%esi 14 xorl %eax,%eax /* clear return value */ 15 cld /* set compare direction forward */ 16 17 movl 20(%esp),%ecx /* compare by words */ 18 shrl $2,%ecx 19 repe 20 cmpsl 21 jne L1 22 23 movl 20(%esp),%ecx /* compare remainder by bytes */ 24 andl $3,%ecx 25 repe 26 cmpsb 27 je L2 28 29 L1: incl %eax 30 L2: popl %esi 31 popl %edi 32 ret 33
