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
   9 long 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 }
  34 EXPORT_SYMBOL(__ashrdi3);