CtoF (double cel)
gimple_bind <
  double D.1796;

  gimple_assign <mult_expr, _1, cel, 9.0e+0, NULL>
  gimple_assign <rdiv_expr, _2, _1, 5.0e+0, NULL>
  gimple_assign <plus_expr, D.1796, _2, 3.2e+1, NULL>
  gimple_return <D.1796 NULL>
>