aboutsummaryrefslogtreecommitdiff
path: root/lib/libc/amd64/string/bcmp.S
blob: 0ac411f4ef969f8bbd70981380e9174c20c1ae4a (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
#include <machine/asm.h>
__FBSDID("$FreeBSD: src/lib/libc/amd64/string/bcmp.S,v 1.2 2005/04/10 18:12:06 alc Exp $");

#if 0
	RCSID("$NetBSD: bcmp.S,v 1.1 2001/06/19 00:25:04 fvdl Exp $")
#endif

ENTRY(bcmp)
	cld				/* set compare direction forward */

	movq	%rdx,%rcx		/* compare by words */
	shrq	$3,%rcx
	repe
	cmpsq
	jne	L1

	movq	%rdx,%rcx		/* compare remainder by bytes */
	andq	$7,%rcx
	repe
	cmpsb
L1:
	setne	%al
	movsbl	%al,%eax
	ret