1 /* { dg-do compile } */ 2 /* { dg-options "-O -ffast-math -fdump-tree-original" } */ 3 foo(double x)4 double foo (double x) 5 { 6 return (x + 0.5 - x - 0.5); 7 } 8 9 /* { dg-final { scan-tree-dump "return 0.0;" "original" } } */ 10