gcc/testsuite/gcc.dg/store_merging_11.c

   1 /* { dg-do compile } */
   2 /* { dg-require-effective-target store_merge } */
   3 /* { dg-options "-O2 -fdump-tree-store-merging" } */
   4
   5 struct S { unsigned char b[2]; unsigned short c; unsigned char d[4]; unsigned long e; };
   6
   7 __attribute__((noipa)) void
   8 foo (struct S *p)
   9 {
  10   p->b[1] = 1;
  11   p->c = 23;
  12   p->d[0] = 4;
  13   p->d[1] = 5;
  14   p->d[2] = 6;
  15   p->d[3] = 7;
  16   p->e = 8;
  17 }
  18
  19 __attribute__((noipa)) void
  20 bar (struct S *p)
  21 {
  22   p->b[1] = 9;
  23   p->c = 112;
  24   p->d[0] = 10;
  25   p->d[1] = 11;
  26 }
  27
  28 struct S s = { { 30, 31 }, 32, { 33, 34, 35, 36 }, 37 };
  29
  30 int
  31 main ()
  32 {
  33   asm volatile ("" : : : "memory");
  34   foo (&s);
  35   asm volatile ("" : : : "memory");
  36   if (s.b[0] != 30 || s.b[1] != 1 || s.c != 23 || s.d[0] != 4 || s.d[1] != 5
  37       || s.d[2] != 6 || s.d[3] != 7 || s.e != 8)
  38     __builtin_abort ();
  39   bar (&s);
  40   asm volatile ("" : : : "memory");
  41   if (s.b[0] != 30 || s.b[1] != 9 || s.c != 112 || s.d[0] != 10 || s.d[1] != 11
  42       || s.d[2] != 6 || s.d[3] != 7 || s.e != 8)
  43     __builtin_abort ();
  44   return 0;
  45 }
  46
  47 /* { dg-final { scan-tree-dump-times "Merging successful" 2 "store-merging" } } */