Definition memval_lessdef: memval -> memval -> Prop := memval_inject inject_id.

Lemma decode_val_int64: forall l1 l2, length l1 = 4%nat -> length l2 = 4%nat -> Archi.ptr64 = false -> Val.lessdef (decode_val Mint64 (l1 ++ l2)) (Val.longofwords (decode_val Mint32 (if Archi.big_endian then l1 else l2)) (decode_val Mint32 (if Archi.big_endian then l2 else l1))).