(** Xor integer immediate. *)

Lemma xorimm_correct:
forall r1 (r2: ireg) n k (rs : regset) m,
let v := Val.xor rs#r2 (Vint n) in
exists rs',
exec_straight ge fn (xorimm r1 r2 n k) rs m  k rs' m
/\ rs'#r1 = v
/\ forall r': preg, r' <> r1 -> r' <> PC -> rs'#r' = rs#r'.