gcc/testsuite/gcc.dg/store_merging_3.c

   1 /* { dg-do compile } */
   2 /* { dg-require-effective-target non_strict_align } */
   3 /* { dg-options "-O2 -fdump-tree-store-merging-details" } */
   4
   5 /* Make sure stores to volatile addresses don't get combined with
   6    other accesses.  */
   7
   8 struct bar
   9 {
  10   int a;
  11   char b;
  12   char c;
  13   volatile short d;
  14   char e;
  15   char f;
  16   char g;
  17 };
  18
  19 void
  20 foozero (struct bar *p)
  21 {
  22   p->b = 0xa;
  23   p->a = 0xb;
  24   p->c = 0xc;
  25   p->d = 0;
  26   p->e = 0xd;
  27   p->f = 0xe;
  28   p->g = 0xf;
  29 }
  30
  31 /* { dg-final { scan-tree-dump "Volatile access terminates all chains" "store-merging" } } */
  32 /* { dg-final { scan-tree-dump-times "=\{v\} 0;" 1 "store-merging" } } */