1  /* { dg-do run } */
       2  /* { dg-require-effective-target store_merge } */
       3  /* { dg-options "-O2 -fdump-tree-store-merging" } */
       4  
       5  struct S {
       6    unsigned int b1:1;
       7    unsigned int b2:1;
       8    unsigned int b3:1;
       9    unsigned int b4:1;
      10    unsigned int b5:1;
      11    unsigned int b6:27;
      12  };
      13  
      14  struct T {
      15    unsigned int b1:1;
      16    unsigned int b2:16;
      17    unsigned int b3:14;
      18    unsigned int b4:1;
      19  };
      20  
      21  __attribute__((noipa)) void
      22  foo (struct S *x)
      23  {
      24    x->b1 = 1;
      25    x->b2 = 0;
      26    x->b3 = 1;
      27    x->b4 = 1;
      28    x->b5 = 0;
      29  }
      30  
      31  __attribute__((noipa)) void
      32  bar (struct T *x)
      33  {
      34    x->b1 = 1;
      35    x->b2 = 0;
      36    x->b4 = 0;
      37  }
      38  
      39  struct S s = { 0, 1, 0, 0, 1, 0x3a5f05a };
      40  struct T t = { 0, 0xf5af, 0x3a5a, 1 };
      41  
      42  int
      43  main ()
      44  {
      45    asm volatile ("" : : : "memory");
      46    foo (&s);
      47    bar (&t);
      48    asm volatile ("" : : : "memory");
      49    if (s.b1 != 1 || s.b2 != 0 || s.b3 != 1 || s.b4 != 1 || s.b5 != 0 || s.b6 != 0x3a5f05a)
      50      __builtin_abort ();
      51    if (t.b1 != 1 || t.b2 != 0 || t.b3 != 0x3a5a || t.b4 != 0)
      52      __builtin_abort ();
      53    return 0;
      54  }
      55  
      56  /* { dg-final { scan-tree-dump-times "Merging successful" 2 "store-merging" } } */