Definition is_int32_noattr_type t :=
 match t with
 | Tint I32 _ {| attr_volatile := false; attr_alignas := None |} => True
 | _ => False
 end.

Lemma mapsto_null_mapsto_pointer: forall t sh v, Archi.ptr64 = false -> mapsto sh (Tint I32 Signed noattr) v nullval = mapsto sh (Tpointer t noattr) v nullval.