diff options
Diffstat (limited to 'sysdeps/rs6000/ffs.c')
-rw-r--r-- | sysdeps/rs6000/ffs.c | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/sysdeps/rs6000/ffs.c b/sysdeps/rs6000/ffs.c new file mode 100644 index 0000000000..4d01727044 --- /dev/null +++ b/sysdeps/rs6000/ffs.c @@ -0,0 +1,42 @@ +/* ffs -- find first set bit in a word, counted from least significant end. + For IBM rs6000. + Copyright (C) 1991, 1992, 1997, 2004 Free Software Foundation, Inc. + This file is part of the GNU C Library. + 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 Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 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 + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include <string.h> + +#undef ffs + +#ifdef __GNUC__ + +int +__ffs (x) + int x; +{ + int cnt; + + asm ("cntlz %0,%1" : "=r" (cnt) : "r" (x & -x)); + return 32 - cnt; +} +weak_alias (__ffs, ffs) +libc_hidden_builtin_def (ffs) + +#else +#include <sysdeps/generic/ffs.c> +#endif |