sysdeps/i960/ffs.c

   1 /* ffs -- find first set bit in a word, counted from least significant end.
   2    For i960 Core architecture
   3    This file is part of the GNU C Library.
   4    Copyright (C) 1994, 1997, 2004, 2005 Free Software Foundation, Inc.
   5    Contributed by Joel Sherrill (jsherril@redstone-emh2.army.mil),
   6    On-Line Applications Research Corporation.
   7
   8    The GNU C Library is free software; you can redistribute it and/or
   9    modify it under the terms of the GNU Lesser General Public
  10    License as published by the Free Software Foundation; either
  11    version 2.1 of the License, or (at your option) any later version.
  12
  13    The GNU C Library is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16    Lesser General Public License for more details.
  17
  18    You should have received a copy of the GNU Lesser General Public
  19    License along with the GNU C Library; if not, write to the Free
  20    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  21    02111-1307 USA.  */
  22
  23 #include <string.h>
  24
  25 #undef  ffs
  26
  27 #if     defined (__GNUC__) && defined (__i960__)
  28
  29 int
  30 __ffs (x)
  31      int x;
  32 {
  33   int cnt;
  34
  35   asm ("scanbit %1,%0" : "=d" (cnt) : "rm" (x & -x));
  36
  37   return cnt;
  38 }
  39 weak_alias (__ffs, ffs)
  40 libc_hidden_builtin_def (ffs)
  41
  42 #else
  43
  44 #include <string/ffs.c>
  45
  46 #endif