1  /* { dg-do run } */
       2  /* { dg-options "-O2 -fno-code-hoisting -fdump-tree-pre-stats" } */
       3  
       4  struct A
       5  {
       6    int i;
       7  };
       8  
       9  struct B
      10  {
      11    struct A a[2];
      12  };
      13  
      14  int i = 1;
      15  struct B b = { 0, 3 };
      16  
      17  void
      18  test ()
      19  {
      20    if (b.a[0].i != i)
      21      {
      22        int t = b.a[0].i;
      23        b.a[0] = b.a[1];
      24        b.a[1].i = t;
      25      }
      26  
      27    if (b.a[1].i == i)
      28      __builtin_abort ();
      29  
      30    if (b.a[0].i == 0)
      31      __builtin_abort ();
      32  }
      33  
      34  int
      35  main ()
      36  {
      37    test ();
      38    return 0;
      39  }
      40  
      41  /* { dg-final { scan-tree-dump "Eliminated: 1" "pre" } } */