Proof with eauto with wd.
intros.
inversion Harg; subst.
eauto.
eapply loadv_wd in H0; eauto.
Qed.

(* Specifications: *)
Lemma valid_val_longofwords:
forall f hi lo,
valid_val f hi ->
valid_val f lo ->
valid_val f (Val.longofwords hi lo).