1  /* { dg-do run } */
       2  /* { dg-require-effective-target store_merge } */
       3  /* { dg-options "-O2 -fno-tree-vectorize -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" } } */