(** Signed right shifts and signed divisions by powers of 2. *)

(* Specifications: *)
Lemma shr_div_two_p:
forall x y,
shr x y = repr (signed x / two_p (unsigned y)).
Theorem divs_pow2:
forall x n logn,
is_power2 n = Some logn ->
divs x n = shrx x logn.