From 28f540f45bbacd939bfd07f213bcad2bf730b1bf Mon Sep 17 00:00:00 2001 From: Roland McGrath Date: Sat, 18 Feb 1995 01:27:10 +0000 Subject: initial import --- sysdeps/rs6000/ffs.c | 39 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 39 insertions(+) create mode 100644 sysdeps/rs6000/ffs.c (limited to 'sysdeps/rs6000/ffs.c') diff --git a/sysdeps/rs6000/ffs.c b/sysdeps/rs6000/ffs.c new file mode 100644 index 0000000..44e7a43 --- /dev/null +++ b/sysdeps/rs6000/ffs.c @@ -0,0 +1,39 @@ +/* ffs -- find first set bit in a word, counted from least significant end. + For IBM rs6000. + Copyright (C) 1991, 1992 Free Software Foundation, Inc. + Contributed by Torbjorn Granlund (tege@sics.se). + +The GNU C Library is free software; you can redistribute it and/or +modify it under the terms of the GNU Library General Public License as +published by the Free Software Foundation; either version 2 of the +License, or (at your option) any later version. + +The GNU C Library is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +Library General Public License for more details. + +You should have received a copy of the GNU Library General Public +License along with the GNU C Library; see the file COPYING.LIB. If +not, write to the Free Software Foundation, Inc., 675 Mass Ave, +Cambridge, MA 02139, USA. */ + +#include +#include + +#undef ffs + +#ifdef __GNUC__ + +int +DEFUN(ffs, (x), int x) +{ + int cnt; + + asm ("cntlz %0,%1" : "=r" (cnt) : "r" (x & -x)); + return 32 - cnt; +} + +#else +#include +#endif -- cgit v1.1