LXR linux/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
  23long 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}
  48EXPORT_SYMBOL(__ashrdi3);
  49