sysdeps/powerpc/powerpc64/ffsll.c

   1 /* Find first set bit in a word, counted from least significant end.
   2    For PowerPC.
   3    Copyright (C) 1991-2019 Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   5    Contributed by Torbjorn Granlund (tege@sics.se).
   6
   7    The GNU C Library is free software; you can redistribute it and/or
   8    modify it under the terms of the GNU Lesser General Public
   9    License as published by the Free Software Foundation; either
  10    version 2.1 of the License, or (at your option) any later version.
  11
  12    The GNU C Library is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15    Lesser General Public License for more details.
  16
  17    You should have received a copy of the GNU Lesser General Public
  18    License along with the GNU C Library; if not, see
  19    <https://www.gnu.org/licenses/>.  */
  20
  21 #define ffsl __something_else
  22 #include <limits.h>
  23 #include <string.h>
  24
  25 #undef  ffs
  26
  27 int
  28 __ffsll (long long int x)
  29 {
  30   int cnt;
  31
  32   asm ("cntlzd %0,%1" : "=r" (cnt) : "r" (x & -x));
  33   return 64 - cnt;
  34 }
  35 weak_alias (__ffsll, ffsll)
  36 #undef ffsl
  37 weak_alias (__ffsll, ffsl)