1  /* { dg-do compile } */
       2  /* { dg-options "-O2 -fdump-tree-optimized" } */
       3  /* { dg-add-options ieee } */
       4  
       5  double f(unsigned int a)
       6  {
       7    return a * -0.0;
       8  }
       9  
      10  /* { dg-final { scan-tree-dump "return -0.0" "optimized" } } */