Definition float := binary64.(**r the type of IEE754 double-precision FP numbers *)
Definition float32 := binary32.(**r the type of IEE754 single-precision FP numbers *)

(** Boolean-valued comparisons *)

Definition cmp_of_comparison (c: comparison) (x: option Datatypes.comparison) : bool :=
  match c with
  | Ceq =>
      match x with Some Eq => true | _ => false end
  | Cne =>
      match x with Some Eq => false | _ => true end
  | Clt =>
      match x with Some Lt => true | _ => false end
  | Cle =>
      match x with Some(Lt|Eq) => true | _ => false end
  | Cgt =>
      match x with Some Gt => true | _ => false end
  | Cge =>
      match x with Some(Gt|Eq) => true | _ => false end
  end.

Lemma cmp_of_comparison_lt_gt_false: forall x, cmp_of_comparison Clt x = true -> cmp_of_comparison Cgt x = true -> False.