diff options
Diffstat (limited to 'sysdeps/powerpc/ffs.c')
-rw-r--r-- | sysdeps/powerpc/ffs.c | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/sysdeps/powerpc/ffs.c b/sysdeps/powerpc/ffs.c new file mode 100644 index 0000000..d9d7f26 --- /dev/null +++ b/sysdeps/powerpc/ffs.c @@ -0,0 +1,38 @@ +/* Find first set bit in a word, counted from least significant end. + For PowerPC. + Copyright (C) 1991, 1992, 1997 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., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include <bstring.h> + +#undef ffs + +#ifdef __GNUC__ + +int +ffs (int x) +{ + int cnt; + + asm ("cntlzw %0,%1" : "=r" (cnt) : "r" (x & -x)); + return 32 - cnt; +} + +#else +#include <sysdeps/generic/ffs.c> +#endif |