gcc/testsuite/gcc.dg/pr89679.c

   1 /* PR rtl-optimization/89679 */
   2 /* { dg-do run } */
   3 /* { dg-options "-Og -frerun-cse-after-loop -fno-tree-fre" } */
   4
   5 unsigned short g;
   6
   7 void
   8 foo (unsigned long long x)
   9 {
  10   if (x != 0xffff)
  11     __builtin_abort ();
  12 }
  13
  14 int
  15 main ()
  16 {
  17 #if __SIZEOF_SHORT__ == 2 && __SIZEOF_INT__ == 4 && __CHAR_BIT__ == 8
  18   unsigned short d = 0;
  19   unsigned long long x, c = ~0;
  20   c = c >> d;
  21   __builtin_memset (&d, c, 2);
  22   x = d + g;
  23   foo (x);
  24 #endif
  25   return 0;
  26 }