bcmp.S revision 144782 
1#include <machine/asm.h>
2__FBSDID("$FreeBSD: head/lib/libc/amd64/string/bcmp.S 144782 2005-04-08 05:15:55Z alc $");
3
4#if 0
5	RCSID("$NetBSD: bcmp.S,v 1.1 2001/06/19 00:25:04 fvdl Exp $")
6#endif
7
8ENTRY(bcmp)
9	xorl	%eax,%eax		/* clear return value */
10	cld				/* set compare direction forward */
11
12	movq	%rdx,%rcx		/* compare by words */
13	shrq	$3,%rcx
14	repe
15	cmpsq
16	jne	L1
17
18	movq	%rdx,%rcx		/* compare remainder by bytes */
19	andq	$7,%rcx
20	repe
21	cmpsb
22	je	L2
23
24L1:	incl	%eax
25L2:	ret
26