gcc/testsuite/gcc.target/m68k/pr47192.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O2 -mcpu=51qe -fdisable-ipa-pure-const -fdump-rtl-pro_and_epilogue" } */
   3 /* { dg-final { scan-rtl-dump-times "unspec_volatile" 1 "pro_and_epilogue"} } */
   4
   5
   6 char F(short *ty);
   7
   8 short V(char cmd)
   9 {
  10   static short st256;
  11   static short stc;
  12   short sc;
  13   short scd;
  14   short d;
  15
  16   F(&sc);
  17
  18   if (cmd == 4)
  19   {
  20     st256 = 0;
  21     d = 0;
  22   }
  23   else
  24   {
  25     scd = sc - stc;
  26     if (scd < -128)
  27     {
  28       scd += 256;
  29     }
  30     d = st256 >> 8;
  31     st256 -= d << 8;
  32   }
  33   stc = sc;
  34   return d;
  35 }
  36