1  /* PR rtl-optimization/47028 */
       2  /* { dg-do run } */
       3  /* { dg-options "-O -foptimize-sibling-calls -fno-forward-propagate -fno-tree-copy-prop -fno-tree-dominator-opts" } */
       4  
       5  int
       6  fib (int n)
       7  {
       8    if (n <= 1)
       9      return 1;
      10    return fib (n - 2) + fib (n - 1);
      11  }
      12  
      13  int
      14  main (void)
      15  {
      16    if (fib (5) != 8)
      17      __builtin_abort ();
      18    return 0;
      19  }