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+(** * Push-Button Snthesis of fancy mongomery reduction : Reification Cache *)
+Require Import Coq.ZArith.ZArith.
+Require Import Coq.derive.Derive.
+Require Import Crypto.Arithmetic.Core.
+Require Import Crypto.Arithmetic.FancyMontgomeryReduction.
+Require Import Crypto.PushButtonSynthesis.ReificationCache.
+Local Open Scope Z_scope.
+
+Import Associational Positional.
+
+Local Set Keyed Unification. (* needed for making [autorewrite] fast, c.f. COQBUG(https://github.com/coq/coq/issues/9283) *)
+
+Module Export MontgomeryReduction.
+  Derive reified_montred_gen
+         SuchThat (is_reification_of reified_montred_gen montred')
+         As reified_montred_gen_correct.
+  Proof. Time cache_reify (). Time Qed.
+  Module Export ReifyHints.
+    Hint Extern 1 (_ = _) => apply_cached_reification montred' (proj1 reified_montred_gen_correct) : reify_cache_gen.
+    Hint Immediate (proj2 reified_montred_gen_correct) : wf_gen_cache.
+    Hint Rewrite (proj1 reified_montred_gen_correct) : interp_gen_cache.
+  End ReifyHints.
+  Local Opaque reified_montred_gen. (* needed for making [autorewrite] not take a very long time *)
+End MontgomeryReduction.