1  /* { dg-do compile } */
       2  /* { dg-options "-O -fdump-tree-optimized -fdump-tree-original" } */
       3  
       4  double foo(double x, double y)
       5  {
       6    return ((x + 0.1234 * y) * (x - 0.1234 * y));
       7  }
       8  
       9  /* Keep positive constants during folding.  */
      10  /* { dg-final { scan-tree-dump-times " 1.23" 2 "original" } } */
      11  /* CSE one multiplication.  */
      12  /* { dg-final { scan-tree-dump-times " \\\* " 2 "optimized" } } */