/*
 * Written by J.T. Conklin <jtc@NetBSD.org>.
 * Public domain.
 */

#include <machine/asm.h>

#if defined(LIBC_SCCS)
        RCSID("$NetBSD: ffs.S,v 1.2 2014/03/22 19:38:46 jakllsch 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_TEXT
L1:     xorl    %eax,%eax               /* clear result */
        ret
END(ffs)