gcc/testsuite/gcc.dg/store_merging_6.c

   1 /* { dg-do run } */
   2 /* { dg-require-effective-target store_merge } */
   3 /* { dg-options "-O2 -fdump-tree-store-merging" } */
   4
   5 /* Check that we can widen accesses to bitfields.  */
   6
   7 struct bar {
   8   int a : 3;
   9   unsigned char b : 4;
  10   unsigned char c : 1;
  11   char d;
  12   char e;
  13   char f;
  14   char g;
  15 };
  16
  17 __attribute__ ((noinline)) void
  18 foozero (struct bar *p)
  19 {
  20   p->b = 0;
  21   p->a = 0;
  22   p->c = 0;
  23   p->d = 0;
  24   p->e = 0;
  25   p->f = 0;
  26   p->g = 0;
  27 }
  28
  29 __attribute__ ((noinline)) void
  30 foo1 (struct bar *p)
  31 {
  32   p->b = 3;
  33   p->a = 2;
  34   p->c = 1;
  35   p->d = 4;
  36   p->e = 5;
  37 }
  38
  39 int
  40 main (void)
  41 {
  42   struct bar p;
  43   foozero (&p);
  44   foo1 (&p);
  45   if (p.a != 2 || p.b != 3 || p.c != 1 || p.d != 4 || p.e != 5
  46       || p.f != 0 || p.g != 0)
  47     __builtin_abort ();
  48
  49   return 0;
  50 }
  51
  52
  53 /* { dg-final { scan-tree-dump-times "Merging successful" 2 "store-merging" } } */