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Let the compiler worry about implementing ffs(3).

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It does at least as good a job as our old hand-written assembly anyway.

Change-Id: If7c4a1ac508bace0b71ee7b67808caa6eabf11d2
This commit is contained in:
Elliott Hughes
2013-10-24 16:29:40 -07:00
parent f8dfb6f249
commit bf425680e4
10 changed files with 40 additions and 179 deletions
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18
libc/arch-x86/string/ffs.S
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@@ -1,18 +0,0 @@
/* $OpenBSD: ffs.S,v 1.3 2005/08/07 11:30:38 espie Exp $ */
/*
* Written by J.T. Conklin <jtc@netbsd.org>.
* Public domain.
*/
#include <machine/asm.h>
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
END(ffs)