1  /* { dg-do compile } */
       2  /* { dg-options "-ffinite-math-only -fdump-tree-gimple" } */
       3  
       4  float f(float x)
       5  {
       6    return x - x;
       7  }
       8  
       9  /* Substraction should be turned into 0.  */
      10  
      11  /* { dg-final { scan-tree-dump-not " - " "gimple" } } */