1  /* { dg-do compile } */
       2  /* { dg-options "-O -ffast-math -fdump-tree-reassoc1 -fdump-tree-optimized" } */
       3  
       4  double foo(double a)
       5  {
       6    double tmp = 5.0;
       7    double tmp2 = a + tmp;
       8    tmp2 = tmp2 - a;
       9    return a + tmp2 - 5.0;
      10  }
      11  
      12  /* { dg-final { scan-tree-dump-not "\\\+ 0.0" "reassoc1" } } */
      13  /* { dg-final { scan-tree-dump "return a_..D.;" "optimized" } } */