Definition compat_pointer_chunks (chunk1 chunk2: memory_chunk) : Prop :=
  match chunk1, chunk2 with
  | (Mint32 | Many32), (Mint32 | Many32) => True
  | (Mint64 | Many64), (Mint64 | Many64) => True
  | _, _ => False
  end.

Theorem loadbytes_storebytes_other: forall b' ofs' len, len >= 0 -> b' <> b \/ ofs' + len <= ofs \/ ofs + Z.of_nat (length bytes) <= ofs' -> loadbytes m2 b' ofs' len = loadbytes m1 b' ofs' len.