/* * Written by J.T. Conklin . * Public domain. * Adapted for NetBSD/x86_64 by Frank van der Linden */ #include #if defined(LIBC_SCCS) RCSID("$NetBSD: ffs.S,v 1.5 2014/03/22 19:16:34 jakllsch Exp $") #endif ENTRY(ffs) bsfl %edi,%eax jz 1f /* ZF is set if all bits are 0 */ incl %eax /* bits numbered from 1, not 0 */ ret 1: xorl %eax,%eax /* clear result */ ret END(ffs)