arch/h8300/lib/ashrdi3.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include "libgcc.h"
   3
   4 DWtype __ashrdi3(DWtype u, word_type b)
   5 {
   6         const DWunion uu = {.ll = u};
   7         const word_type bm = (sizeof (Wtype) * BITS_PER_UNIT) - b;
   8         DWunion w;
   9
  10         if (b == 0)
  11                 return u;
  12
  13         if (bm <= 0) {
  14                 /* w.s.high = 1..1 or 0..0 */
  15                 w.s.high = uu.s.high >> (sizeof (Wtype) * BITS_PER_UNIT - 1);
  16                 w.s.low = uu.s.high >> -bm;
  17         } else {
  18                 const UWtype carries = (UWtype) uu.s.high << bm;
  19
  20                 w.s.high = uu.s.high >> b;
  21                 w.s.low = ((UWtype) uu.s.low >> b) | carries;
  22         }
  23
  24         return w.ll;
  25 }