arch/h8300/lib/ashrdi3.c

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