1/*	$OpenBSD: ffs.S,v 1.3 2005/08/07 11:30:38 espie Exp $ */
2/*
3 * Written by J.T. Conklin <jtc@netbsd.org>.
4 * Public domain.
5 */
6
7#include <machine/asm.h>
8
9RCSID("$MirOS: src/kern/c/i386/ffs.S,v 1.2 2008/08/03 21:02:02 tg Exp $")
10
11	.text
12
13ENTRY(ffs)
14	bsfl	4(%esp),%eax
15	jz	L1	 		/* ZF is set if all bits are 0 */
16	incl	%eax			/* bits numbered from 1, not 0 */
17	ret
18
19	_ALIGN_TEXT
20L1:	xorl	%eax,%eax		/* clear result */
21	ret
22