Hint Resolve tc_val_pointer_nullval'.
Arguments type_is_volatile ty / .
Definition is_int32_noattr_type t :=
match t with
| Tint I32 _ {| attr_volatile := false; attr_alignas := None |} => True
| _ => False
end.

Lemma mapsto_mapsto_int32:
forall sh t1 t2 p v,
is_int32_noattr_type t1 ->
is_int32_noattr_type t2 ->
mapsto sh t1 p v |-- mapsto sh t2 p v.