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NetBSD/lib/libc/arch/i386/string/ffs.S

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make an arch directory in libc, and move all machine dirs into it
1993-10-07 03:17:24 +03:00
/*
Winning Strategies has placed this code into the Public Domain
1995-04-29 02:53:59 +04:00
* Written by J.T. Conklin <jtc@netbsd.org>.
* Public domain.
make an arch directory in libc, and move all machine dirs into it
1993-10-07 03:17:24 +03:00
*/
Use RCSID macro for RCS ID's.
1994-03-12 04:39:55 +03:00
#include <machine/asm.h>
Change instances of LIBC_RCS back to LIBC_SCCS. If we are going to change th LIBC_RCS, the entire source tree should be updated at once. Remove && !defined(lint) from conditionals around rcs id's. No one is ever going to pass a *.s file through lint.
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#if defined(LIBC_SCCS)
$Id: $ -> $NetBSD: $
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RCSID("$NetBSD: ffs.S,v 1.7 1995/04/28 22:58:00 jtc Exp $")
Change instances of LIBC_RCS back to LIBC_SCCS. If we are going to change th LIBC_RCS, the entire source tree should be updated at once. Remove && !defined(lint) from conditionals around rcs id's. No one is ever going to pass a *.s file through lint.
1993-10-21 04:39:55 +03:00
#endif
make an arch directory in libc, and move all machine dirs into it
1993-10-07 03:17:24 +03:00
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