Definition cmpl_bool (c: comparison) (v w: aval) : abool :=
  match v, w with
  | L i1, L i2 => Just (Int64.cmp c i1 i2)
  | _, _ => Btop
  end.

Lemma cmpl_bool_sound: forall c v w x y, vmatch v x -> vmatch w y -> cmatch (Val.cmpl_bool c v w) (cmpl_bool c x y).