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diff --git a/src/PropToBool.v b/src/PropToBool.v
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+(**************************************************************************)
+(*                                                                        *)
+(*     SMTCoq                                                             *)
+(*     Copyright (C) 2011 - 2019                                          *)
+(*                                                                        *)
+(*     See file "AUTHORS" for the list of authors                         *)
+(*                                                                        *)
+(*   This file is distributed under the terms of the CeCILL-C licence     *)
+(*                                                                        *)
+(**************************************************************************)
+
+
+Require Import
+        Bool ZArith BVList Logic BVList FArray
+        SMT_classes SMT_classes_instances ReflectFacts.
+Import BVList.BITVECTOR_LIST. 
+
+Ltac prop2bool :=
+  repeat
+    match goal with
+    | [ |- forall _ : bitvector _, _] => intro
+    | [ |- forall _ : farray _ _, _] => intro
+    | [ |- forall _ : _ -> _, _] => intro
+    | [ |- forall _ : Z, _] => intro
+    | [ |- forall _ : bool, _] => intro
+    | [ |- forall _ : Type, _] => intro
+    | [ p: (CompDec ?t) |-  context[ forall _ : ?t, _ ] ] => intro
+
+    | [ |- forall t : Type, CompDec t -> _  ] => intro
+    | [ |- CompDec _ -> _  ] => intro
+    | [ |- context[ bv_ultP _ _ ] ] => rewrite <- bv_ult_B2P
+    | [ |- context[ bv_sltP _ _ ] ] => rewrite <- bv_slt_B2P
+    | [ |- context[ Z.lt _ _ ] ] => rewrite <- Z.ltb_lt
+    | [ |- context[ Z.gt _ _ ] ] => rewrite Z.gt_lt_iff; rewrite <- Z.ltb_lt
+    | [ |- context[ Z.le _ _ ] ] => rewrite <- Z.leb_le
+    | [ |- context[ Z.ge _ _ ] ] => rewrite Z.ge_le_iff; rewrite <- Z.leb_le
+    | [ |- context[ Z.eq _ _ ] ] => rewrite <- Z.eqb_eq
+
+    | [ p: (CompDec ?t) |- context[ @Logic.eq ?t _ _ ] ] =>
+      pose proof p as p0;
+      rewrite (@compdec_eq_eqb _ p0);
+      destruct p0;
+      try exact p
+
+    | [ Eqb : (EqbType ?ty)  |- _ ] => destruct Eqb; simpl
+
+    | [ |- context[ @Logic.eq (bitvector _) _ _ ] ] =>
+      rewrite <- bv_eq_reflect
+
+    | [ |- context[ @Logic.eq (farray _ _) _ _ ] ] =>
+      rewrite <- equal_iff_eq
+
+    | [ |- context[ @Logic.eq Z _ _ ] ] =>
+      rewrite <- Z.eqb_eq
+
+    | [ |- context[?G0 = true \/ ?G1 = true ] ] =>
+      rewrite (@reflect_iff (G0 = true \/ G1 = true) (orb G0 G1));
+      [ | apply orP]
+
+    | [ |- context[?G0 = true -> ?G1 = true ] ] =>
+      rewrite (@reflect_iff (G0 = true -> G1 = true) (implb G0 G1)); 
+      [ | apply implyP]
+
+    | [ |- context[?G0 = true /\ ?G1 = true ] ] =>
+      rewrite (@reflect_iff (G0 = true /\ G1 = true) (andb G0 G1));
+      [ | apply andP]
+
+    | [ |- context[?G0 = true <-> ?G1 = true ] ] =>
+      rewrite (@reflect_iff (G0 = true <-> G1 = true) (Bool.eqb G0 G1));
+      [ | apply iffP]
+          
+    | [ |- context[ ~ ?G = true ] ] =>
+      rewrite (@reflect_iff (~ G = true) (negb G));
+      [ | apply negP]
+
+    | [ |- context[ is_true ?G ] ] =>
+      unfold is_true
+
+    | [ |- context[ True ] ] => rewrite <- TrueB
+
+    | [ |- context[ False ] ] => rewrite <- FalseB
+
+    (* | [ |- _ : (CompDec _ )] => try easy *)
+    end.
+