release/src-rt-6.x.4708/linux/linux-2.6.36/arch/score/lib/ashrdi3.c

   1 /*
   2  * arch/score/lib/ashrdi3.c
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program 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
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, see the file COPYING, or write
  16  * to the Free Software Foundation, Inc.,
  17  * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  18  */
  19
  20 #include <linux/module.h>
  21 #include "libgcc.h"
  22
  23 long long __ashrdi3(long long u, word_type b)
  24 {
  25         DWunion uu, w;
  26         word_type bm;
  27
  28         if (b == 0)
  29                 return u;
  30
  31         uu.ll = u;
  32         bm = 32 - b;
  33
  34         if (bm <= 0) {
  35                 /* w.s.high = 1..1 or 0..0 */
  36                 w.s.high =
  37                     uu.s.high >> 31;
  38                 w.s.low = uu.s.high >> -bm;
  39         } else {
  40                 const unsigned int carries = (unsigned int) uu.s.high << bm;
  41
  42                 w.s.high = uu.s.high >> b;
  43                 w.s.low = ((unsigned int) uu.s.low >> b) | carries;
  44         }
  45
  46         return w.ll;
  47 }
  48 EXPORT_SYMBOL(__ashrdi3);