Definition cmplu_bool (c: comparison) (v w: aval) : abool :=
match v, w with
| L i1, L i2 => Just (Int64.cmpu c i1 i2)
| Ptr _, L i => if Int64.eq i Int64.zero then cmp_different_blocks c else Btop
| L i, Ptr _ => if Int64.eq i Int64.zero then cmp_different_blocks c else Btop
| Ptr p1, Ptr p2 => pcmp c p1 p2
| _, _ => Btop
end.

(* Specifications: *)
Lemma cmplu_bool_sound:
forall valid c v w x y, vmatch v x -> vmatch w y -> cmatch (Val.cmplu_bool valid c v w) (cmplu_bool c x y).