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Annotation of sys/lib/libkern/arch/i386/ffs.S, Revision 1.1.1.1

1.1       nbrk        1: /*     $OpenBSD: ffs.S,v 1.2 1996/09/27 06:47:45 mickey Exp $  */
                      2:
                      3: /*
                      4:  * Written by J.T. Conklin <jtc@netbsd.org>.
                      5:  * Public domain.
                      6:  */
                      7:
                      8: #include <machine/asm.h>
                      9:
                     10: ENTRY(ffs)
                     11:        bsfl    4(%esp),%eax
                     12:        jz      L1                      /* ZF is set if all bits are 0 */
                     13:        incl    %eax                    /* bits numbered from 1, not 0 */
                     14:        ret
                     15:
                     16:        .align 2
                     17: L1:    xorl    %eax,%eax               /* clear result */
                     18:        ret