(** Composing or decomposing [storebytes] operations at adjacent addresses. *)

Axiom storebytes_split:
forall m b ofs bytes1 bytes2 m2,
storebytes m b ofs (bytes1 ++ bytes2) = Some m2 ->
exists m1,
storebytes m b ofs bytes1 = Some m1
/\ storebytes m1 b (ofs + Z.of_nat(length bytes1)) bytes2 = Some m2.