blob: 00d4437c1c8b56848622c29f0a3cc08cfd88fa0f (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
|
/*
* Written by J.T. Conklin <jtc@NetBSD.org>.
* Public domain.
* Adapted for NetBSD/x86_64 by Frank van der Linden <fvdl@wasabisystems.com>
*/
#include <machine/asm.h>
#if defined(LIBC_SCCS)
RCSID("$NetBSD: ffs.S,v 1.5 2014/03/22 19:16:34 jakllsch Exp $")
#endif
ENTRY(ffs)
bsfl %edi,%eax
jz 1f /* ZF is set if all bits are 0 */
incl %eax /* bits numbered from 1, not 0 */
ret
1: xorl %eax,%eax /* clear result */
ret
END(ffs)
|
