sysdeps/alpha/alphaev67/ffsll.S

   1 /* Copyright (C) 2000-2015 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library.  If not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 /* Finds the first bit set in a long.  */
  19
  20 #include <sysdep.h>
  21
  22         .arch ev6
  23         .set noreorder
  24         .set noat
  25
  26 ENTRY(ffsl)
  27 #ifdef PROF
  28         ldgp    gp, 0(pv)
  29         lda     AT, _mcount
  30         jsr     AT, (AT), _mcount
  31         .prologue 1
  32 #else
  33         .prologue 0
  34 #endif
  35
  36         cttz    $16, $0
  37         addq    $0, 1, $0
  38         cmoveq  $16, 0, $0
  39         ret
  40
  41 END(ffsl)
  42
  43 weak_extern (ffsl)
  44 weak_alias (ffsl, ffsll)