ffs.S revision 1.3 
1/*	$OpenBSD: ffs.S,v 1.3 2020/11/28 19:49:30 gkoehler Exp $ */
2/*
3 * Written by Christian Weisgerber <naddy@openbsd.org>.
4 * Public domain.
5 */
6
7#include <machine/asm.h>
8
9ENTRY(ffs)
10	RETGUARD_SETUP(ffs, %r11, %r12)
11	neg	%r4, %r3
12	and	%r3, %r3, %r4
13	cntlzw	%r3, %r3
14	subfic	%r3, %r3, 32
15	RETGUARD_CHECK(ffs, %r11, %r12)
16	blr
17END(ffs)
18