gcc/testsuite/gcc.dg/store_merging_29.c

   1 /* PR tree-optimization/88709 */
   2 /* { dg-do run { target int32 } } */
   3 /* { dg-require-effective-target store_merge } */
   4 /* { dg-options "-O2 -fno-tree-vectorize -fdump-tree-store-merging-details" } */
   5 /* { dg-final { scan-tree-dump "New sequence of 3 stores to replace old one of 6 stores" "store-merging" { target { le && { ! arm*-*-* } } } } } */
   6 /* { dg-final { scan-tree-dump "New sequence of \[34] stores to replace old one of 6 stores" "store-merging" { target { be && { ! arm*-*-* } } } } } */
   7
   8 struct T { char a[1024]; };
   9
  10 __attribute__((noipa)) void
  11 bar (struct T *t)
  12 {
  13   int x = 0x506;
  14   if (__builtin_memcmp (&t->a[97], &x, sizeof (x)))
  15     __builtin_abort ();
  16   __builtin_memset (&t->a[97], '\0', sizeof (x));
  17   for (int i = 0; i < 8; ++i)
  18     if (t->a[i] != ((i == 54) + 2 * (i == 52) + 3 * (i == 95) + 4 * (i == 96)))
  19       __builtin_abort ();
  20 }
  21
  22 int
  23 main ()
  24 {
  25   struct T t = {};
  26   t.a[54] = 1;
  27   t.a[52] = 2;
  28   t.a[95] = 3;
  29   t.a[96] = 4;
  30   int x = 0x506;
  31   __builtin_memcpy (&t.a[97], &x, sizeof (x));
  32   bar (&t);
  33 }