gcc/testsuite/gcc.dg/store_merging_26.c

   1 /* PR tree-optimization/90271 */
   2 /* { dg-do run { target int32 } } */
   3 /* { dg-require-effective-target store_merge } */
   4 /* { dg-options "-O2 -fdump-tree-store-merging-details" } */
   5 /* { dg-final { scan-tree-dump "New sequence of 1 stores to replace old one of 2 stores" "store-merging" } } */
   6
   7 __attribute__((noipa)) void
   8 foo (int *x)
   9 {
  10   asm volatile ("" : : "r" (x) : "memory");
  11 }
  12
  13 __attribute__((noipa)) int
  14 bar ()
  15 {
  16   int x;
  17   foo (&x);
  18   x = 3;
  19   ((char *) &x)[1] = 1;
  20   foo (&x);
  21   return x;
  22 }
  23
  24 int
  25 main ()
  26 {
  27   int x;
  28   foo (&x);
  29   x = 3;
  30   foo (&x);
  31   ((char *) &x)[1] = 1;
  32   foo (&x);
  33   if (x != bar ())
  34     __builtin_abort ();
  35   return 0;
  36 }