Require Export VST.floyd.canon.
Local Open Scope logic.
Ltac refold_right_sepcon R :=
match R with
| @sepcon mpred _ _ ?R1 ?R' => let S := refold_right_sepcon R' in constr: (R1 :: S )
| _ => constr:(R :: nil)
end.
Arguments sem_cmp c !t1 !t2 / v1 v2.
(* The following line should not be needed, and was not needed in Coq 8.3, but in Coq 8.4 it seems to be necessary. *)
Hint Resolve (@LiftClassicalSep environ) : typeclass_instances.
Definition func_ptr' f v := func_ptr f v && emp.
Hint Resolve func_ptr_isptr: saturate_local.
Hint Resolve func_ptr'_isptr: saturate_local.
Hint Rewrite @subst_lift0' : subst.
Hint Rewrite @subst_lift0 (*@subst_lift0'*) @subst_lift0C : subst.
Hint Rewrite @subst_lift1 (*@subst_lift1'*) @subst_lift1C  : subst.
Hint Rewrite @subst_lift2 (*@subst_lift2'*) @subst_lift2C : subst.
Hint Rewrite @subst_lift3 (*@subst_lift3'*) @subst_lift3C : subst.

Lemma subst_lift4:
forall {A1 A2 A3 A4 B} id v (f: A1 -> A2 -> A3 -> A4 -> B) a1 a2 a3 a4,
subst id v (lift4 f a1 a2 a3 a4) = lift4 f (subst id v a1) (subst id v a2) (subst id v a3) (subst id v a4).