LXR linux/lib/ashrdi3.c

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 */
   4
   5#include <linux/export.h>
   6
   7#include <linux/libgcc.h>
   8
   9long long notrace __ashrdi3(long long u, word_type b)
  10{
  11        DWunion uu, w;
  12        word_type bm;
  13
  14        if (b == 0)
  15                return u;
  16
  17        uu.ll = u;
  18        bm = 32 - b;
  19
  20        if (bm <= 0) {
  21                /* w.s.high = 1..1 or 0..0 */
  22                w.s.high =
  23                    uu.s.high >> 31;
  24                w.s.low = uu.s.high >> -bm;
  25        } else {
  26                const unsigned int carries = (unsigned int) uu.s.high << bm;
  27
  28                w.s.high = uu.s.high >> b;
  29                w.s.low = ((unsigned int) uu.s.low >> b) | carries;
  30        }
  31
  32        return w.ll;
  33}
  34EXPORT_SYMBOL(__ashrdi3);
  35