1  /* This testcase caused on IA-32 -O2 endless loop in
       2     merge_blocks when trying to merge a basic block
       3     with itself.  */
       4  
       5  void f (void)
       6  {
       7    char *c;
       8    do
       9      {
      10        if (c)
      11  	break;
      12      }
      13    while (1);
      14    if (!c)
      15      while (1)
      16        f ();
      17  }