libc/string/ffsll.c

   1 /* Copyright (C) 1991, 1992, 1997, 1998 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Torbjorn Granlund (tege@sics.se).
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <limits.h>
  20 #include <string.h>
  21
  22 /* Find the first bit set in I.  */
  23 int ffsll (long long int i)
  24 {
  25   unsigned long long int x = i & -i;
  26
  27   if (x <= 0xffffffff)
  28     return ffs (i);
  29   else
  30     return 32 + ffs (i >> 32);
  31 }
  32
  33 #if ULONG_MAX != UINT_MAX
  34 strong_alias_untyped(ffsll, ffsl)
  35 #endif