21 lines
374 B
ArmAsm
21 lines
374 B
ArmAsm
/*
|
|
* Written by J.T. Conklin <jtc@netbsd.org>.
|
|
* Public domain.
|
|
*/
|
|
|
|
#include <machine/asm.h>
|
|
|
|
#if defined(LIBC_SCCS)
|
|
RCSID("$NetBSD: ffs.S,v 1.6 1998/02/22 08:14:57 mycroft Exp $")
|
|
#endif
|
|
|
|
ENTRY(ffs)
|
|
bsfl 4(%esp),%eax
|
|
jz L1 /* ZF is set if all bits are 0 */
|
|
incl %eax /* bits numbered from 1, not 0 */
|
|
ret
|
|
|
|
.align 2
|
|
L1: xorl %eax,%eax /* clear result */
|
|
ret
|