Definition cast_pointer_to_bool t1 t2 :=
 match t1 with (Tpointer _ _ | Tarray _ _ _ | Tfunction _ _ _) => 
           match t2 with Tint IBool _ _ => true | _ => false end
 | _ => false
end.

Lemma eval_both_relate: forall {CS: compspecs} Delta ge te ve rho e m, genv_cenv ge = cenv_cs -> rho = construct_rho (filter_genv ge) ve te -> typecheck_environ Delta rho -> (denote_tc_assert (typecheck_expr Delta e) rho (m_phi m) -> Clight.eval_expr ge ve te (m_dry m) e (eval_expr e rho)) /\ (denote_tc_assert (typecheck_lvalue Delta e) rho (m_phi m) -> exists b, exists ofs, Clight.eval_lvalue ge ve te (m_dry m) e b ofs /\ eval_lvalue e rho = Vptr b ofs).