(** The size of a type is an integral multiple of its alignment, unless the alignment was artificially increased with the [__Alignas] attribute. *)
Fixpoint naturally_aligned (t: type) : Prop :=
attr_alignas (attr_of_type t) = None /\
match t with
| Tarray t' _ _ => naturally_aligned t'
| _ => True
end.

Lemma sizeof_alignof_compat:
forall env t, naturally_aligned t -> (alignof env t | sizeof env t).