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 store_signed_unsigned_8:
forall m b ofs v,
store Mint8signed m b ofs v = store Mint8unsigned m b ofs v.