xref: /openbsd/sys/lib/libkern/arch/powerpc/ffs.S (revision 4cfece93) 
1/*	$OpenBSD: ffs.S,v 1.1 2020/06/10 20:19:29 naddy Exp $ */
2/*
3 * Written by Christian Weisgerber <naddy@openbsd.org>.
4 * Public domain.
5 */
6
7#include <machine/asm.h>
8
9ENTRY(ffs)
10	neg	%r4, %r3
11	and	%r3, %r3, %r4
12	cntlzw	%r3, %r3
13	subfic	%r3, %r3, 32
14	blr
15END(ffs)
16