sysdeps/i960/ffs.c

   1 /* ffs -- find first set bit in a word, counted from least significant end.
   2    For i960 Core architecture
   3    Copyright (C) 1994 Free Software Foundation, Inc.
   4    Contributed by Joel Sherrill (jsherril@redstone-emh2.army.mil),
   5      On-Line Applications Research Corporation.
   6
   7 The GNU C Library is free software; you can redistribute it and/or
   8 modify it under the terms of the GNU Library General Public License as
   9 published by the Free Software Foundation; either version 2 of the
  10 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 Library General Public License for more details.
  16
  17 You should have received a copy of the GNU Library General Public
  18 License along with the GNU C Library; see the file COPYING.LIB.  If
  19 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  20 Cambridge, MA 02139, USA.  */
  21
  22 #include <ansidecl.h>
  23 #include <string.h>
  24
  25 #undef  ffs
  26
  27 #if     defined (__GNUC__) && defined (__i960__)
  28
  29 int
  30 DEFUN(ffs, (x), int x)
  31 {
  32   int cnt;
  33
  34   asm("scanbit %1,%0" : "=d" (cnt) : "rm" (x & -x));
  35
  36   return cnt;
  37 }
  38
  39 #else
  40
  41 #include <sysdeps/generic/ffs.c>
  42
  43 #endif