bcmp.S revision 144868 
1#include <machine/asm.h>
2__FBSDID("$FreeBSD: head/lib/libc/amd64/string/bcmp.S 144868 2005-04-10 18:12:07Z 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	cld				/* set compare direction forward */
10
11	movq	%rdx,%rcx		/* compare by words */
12	shrq	$3,%rcx
13	repe
14	cmpsq
15	jne	L1
16
17	movq	%rdx,%rcx		/* compare remainder by bytes */
18	andq	$7,%rcx
19	repe
20	cmpsb
21L1:
22	setne	%al
23	movsbl	%al,%eax
24	ret
25