diff --git a/projects/lib/GmpAux.v b/projects/lib/GmpAux.v
index 6d4d524..40a1bcb 100755
--- a/projects/lib/GmpAux.v
+++ b/projects/lib/GmpAux.v
@@ -101,6 +101,17 @@ Proof.
     reflexivity.
 Qed.
 
+Lemma list_app_single_l: forall (l: list Z) (a: Z),
+  ([a] ++ l)%list = a :: l.
+Proof.
+  intros.
+  induction l.
+  + simpl; reflexivity.
+  + rewrite list_app_cons.
+    simpl.
+    reflexivity.
+Qed.
+
 Lemma store_array_rec_false: forall x storeA lo hi (l: list Z),
   lo > hi ->
   store_array_rec storeA x lo hi l |-- [| False |].
diff --git a/projects/lib/GmpNumber.v b/projects/lib/GmpNumber.v
index 9ba0593..d6dacae 100755
--- a/projects/lib/GmpNumber.v
+++ b/projects/lib/GmpNumber.v
@@ -49,6 +49,19 @@ Definition mpd_store_Z (ptr: addr) (n: Z) (size: Z) (cap: Z): Assertion :=
   EX data,
     mpd_store_list ptr data cap && [| list_store_Z data n |] && [| size = Zlength data |].
 
+Lemma list_store_Z_injection: forall l1 l2 n1 n2,
+  list_store_Z l1 n1 ->
+  list_store_Z l2 n2 ->
+  l1 = l2 -> n1 = n2.
+Proof.
+  intros.
+  unfold list_store_Z in *.
+  destruct H, H0.
+  rewrite <-H, <-H0.
+  rewrite <-H1.
+  reflexivity.
+Qed.
+
 Lemma __list_within_bound_concat_r: forall (l1: list Z) (a: Z),
   list_within_bound l1 ->
   0 <= a < UINT_MOD ->
@@ -350,6 +363,93 @@ Proof.
       reflexivity.
 Qed.
 
+Lemma list_store_Z_cmp: forall l1 l2 n1 n2 i,
+  0 <= i < Zlength l1 ->
+  Zlength l1 = Zlength l2 ->
+  list_store_Z l1 n1 ->
+  list_store_Z l2 n2 ->
+  sublist (i + 1) (Zlength l1) l1 = sublist (i + 1) (Zlength l2) l2 ->
+  Znth i l1 0 < Znth i l2 0 ->
+  n1 < n2.
+Proof.
+  intros.
+  assert (Zlength l1 = Z.of_nat (Datatypes.length l1)). { apply Zlength_correct. }
+  pose proof (sublist_split 0 (Zlength l1) i l1 ltac:(lia) ltac:(lia)).
+  assert (Zlength l2 = Z.of_nat (Datatypes.length l2)). { apply Zlength_correct. }
+  pose proof (sublist_split 0 (Zlength l2) i l2 ltac:(lia) ltac:(lia)).
+  clear H5 H7.
+  rewrite (sublist_self l1 (Zlength l1) ltac:(lia)) in H6.
+  rewrite (sublist_self l2 (Zlength l2) ltac:(lia)) in H8.
+  rewrite H6 in H1.
+  rewrite H8 in H2.
+  apply list_store_Z_split in H1, H2.
+  remember (Zlength l1) as n eqn:Hn.
+  assert (Zlength l2 = n). { lia. }
+  rewrite H5 in *.
+  rewrite Zlength_sublist0 in H1, H2; try lia.
+  destruct H1, H2.
+  remember (n1 mod UINT_MOD ^ i) as n1_lo eqn:Hn1_lo.
+  remember (n1 / UINT_MOD ^ i) as n1_hi eqn:Hn1_hi.
+  remember (n2 mod UINT_MOD ^ i) as n2_lo eqn:Hn2_lo.
+  remember (n2 / UINT_MOD ^ i) as n2_hi eqn:Hn2_hi.
+  remember (sublist 0 i l1) as l1_lo eqn:Hl1_lo.
+  remember (sublist i n l1) as l1_hi eqn:Hl1_hi.
+  remember (sublist 0 i l2) as l2_lo eqn:Hl2_lo.
+  remember (sublist i n l2) as l2_hi eqn:Hl2_hi.
+  assert (n1_lo - n2_lo < UINT_MOD ^ i). {
+    pose proof (list_store_Z_bound l1_lo n1_lo H1).
+    pose proof (list_store_Z_bound l2_lo n2_lo H2).
+    rewrite Hl1_lo, Zlength_sublist0 in H10; lia.
+  }
+  assert (n2_hi - n1_hi >= 1). {
+    assert (Zlength l1_hi >= 1 /\ Zlength l2_hi >= 1). {
+      pose proof (Zlength_sublist i n l1 ltac:(lia)).
+      pose proof (Zlength_sublist i n l2 ltac:(lia)).
+      rewrite <-Hl1_hi in H11.
+      rewrite <-Hl2_hi in H12.
+      lia.
+    }
+    destruct H11.
+    destruct l1_hi, l2_hi; try rewrite Zlength_nil in *; try lia.
+    unfold list_store_Z in H7, H9.
+    destruct H7, H9.
+    simpl in H7, H9.
+    assert (forall a (l0 l: list Z), 
+      a :: l0 = sublist i n l -> 
+      Zlength l = n -> 
+      l0 = sublist (i + 1) n l /\ a = Znth i l 0
+      ). {
+      intros.
+      assert (n = Z.of_nat(Datatypes.length l)). { rewrite <-Zlength_correct. lia. }
+      pose proof (sublist_split i n (i + 1) l ltac:(lia) ltac:(lia)).
+      rewrite (sublist_single i l 0) in H18; try lia.
+      rewrite <-H15 in H18.
+      rewrite Aux.list_app_single_l in H18.
+      injection H18; intros.
+      rewrite H19, H20.
+      split; reflexivity.
+    }
+    pose proof (H15 z0 l2_hi l2 Hl2_hi ltac:(lia)).
+    specialize (H15 z l1_hi l1 Hl1_hi ltac:(lia)).
+    destruct H15, H16.
+    rewrite H15, H17 in H7.
+    rewrite H16, H18 in H9.
+    rewrite <-H3 in H9.
+    lia.
+  }
+  pose proof (Zmod_eq_full n1 (UINT_MOD ^ i) ltac:(lia)).
+  pose proof (Zmod_eq_full n2 (UINT_MOD ^ i) ltac:(lia)).
+  rewrite <-Hn1_lo, <-Hn1_hi in H12.
+  rewrite <-Hn2_lo, <-Hn2_hi in H13.
+  assert (n2_hi * UINT_MOD ^ i - n1_hi * UINT_MOD ^ i >= UINT_MOD ^ i). {
+    rewrite <-Z.mul_sub_distr_r.
+    pose proof (Zmult_ge_compat_r (n2_hi - n1_hi) 1 (UINT_MOD ^ i) ltac:(lia) ltac:(lia)).
+    rewrite Z.mul_1_l in H14.
+    lia.
+  }
+  lia.
+Qed.
+
 End Internal.
 
 Record bigint_ent: Type := {
diff --git a/projects/lib/gmp_goal.v b/projects/lib/gmp_goal.v
index 0456f92..0b3e985 100644
--- a/projects/lib/gmp_goal.v
+++ b/projects/lib/gmp_goal.v
@@ -9,8 +9,8 @@ Require Import Coq.Sorting.Permutation.
 From AUXLib Require Import int_auto Axioms Feq Idents List_lemma VMap.
 Require Import SetsClass.SetsClass. Import SetsNotation.
 From SimpleC.SL Require Import Mem SeparationLogic.
-Require Import GmpLib.GmpNumber. Import Internal.
 Require Import Logic.LogicGenerator.demo932.Interface.
+Require Import GmpLib.GmpNumber. Import Internal.
 Local Open Scope Z_scope.
 Local Open Scope sets.
 Local Open Scope string.
@@ -591,6 +591,562 @@ forall (cap2: Z) (l': (@list Z)) (l: (@list Z)) (i: Z) (n: Z) (d: Z) ,
   **  (store_uint_array d (i + 1 ) (app ((sublist (0) (i) (l))) ((cons (a) (nil)))) )
 .
 
+(*----- Function mpn_cmp -----*)
+
+Definition mpn_cmp_safety_wit_1 := 
+forall (n_pre: Z) (bp_pre: Z) (ap_pre: Z) (val2: Z) (val1: Z) (cap2: Z) (cap1: Z) (l2: (@list Z)) (l1: (@list Z)) ,
+  [| (list_store_Z l1 val1 ) |] 
+  &&  [| (list_store_Z l2 val2 ) |] 
+  &&  [| (n_pre = (Zlength (l1))) |] 
+  &&  [| (n_pre = (Zlength (l2))) |] 
+  &&  [| (0 < n_pre) |] 
+  &&  [| (n_pre <= cap1) |] 
+  &&  [| (n_pre <= cap2) |] 
+  &&  [| (cap1 <= 100000000) |] 
+  &&  [| (cap2 <= 100000000) |]
+  &&  (store_uint_array ap_pre n_pre l1 )
+  **  (store_uint_array bp_pre n_pre l2 )
+  **  (store_undef_uint_array_rec ap_pre (n_pre + 1 ) cap1 )
+  **  (store_undef_uint_array_rec bp_pre (n_pre + 1 ) cap2 )
+  **  ((( &( "n" ) )) # Int  |-> n_pre)
+  **  ((( &( "bp" ) )) # Ptr  |-> bp_pre)
+  **  ((( &( "ap" ) )) # Ptr  |-> ap_pre)
+|--
+  [| ((n_pre - 1 ) <= INT_MAX) |] 
+  &&  [| ((INT_MIN) <= (n_pre - 1 )) |]
+.
+
+Definition mpn_cmp_safety_wit_2 := 
+forall (n_pre: Z) (bp_pre: Z) (ap_pre: Z) (val2: Z) (val1: Z) (cap2: Z) (cap1: Z) (l2: (@list Z)) (l1: (@list Z)) (n: Z) ,
+  [| ((-1) <= n) |] 
+  &&  [| (n < n_pre) |] 
+  &&  [| (list_store_Z l1 val1 ) |] 
+  &&  [| (list_store_Z l2 val2 ) |] 
+  &&  [| (n_pre = (Zlength (l1))) |] 
+  &&  [| (n_pre = (Zlength (l2))) |] 
+  &&  [| ((sublist ((n + 1 )) (n_pre) (l1)) = (sublist ((n + 1 )) (n_pre) (l2))) |] 
+  &&  [| (list_store_Z l1 val1 ) |] 
+  &&  [| (list_store_Z l2 val2 ) |] 
+  &&  [| (n_pre = (Zlength (l1))) |] 
+  &&  [| (n_pre = (Zlength (l2))) |] 
+  &&  [| (0 < n_pre) |] 
+  &&  [| (n_pre <= cap1) |] 
+  &&  [| (n_pre <= cap2) |] 
+  &&  [| (cap1 <= 100000000) |] 
+  &&  [| (cap2 <= 100000000) |]
+  &&  ((( &( "n" ) )) # Int  |-> n)
+  **  (store_uint_array ap_pre n_pre l1 )
+  **  (store_uint_array bp_pre n_pre l2 )
+  **  (store_undef_uint_array_rec ap_pre (n_pre + 1 ) cap1 )
+  **  (store_undef_uint_array_rec bp_pre (n_pre + 1 ) cap2 )
+  **  ((( &( "bp" ) )) # Ptr  |-> bp_pre)
+  **  ((( &( "ap" ) )) # Ptr  |-> ap_pre)
+|--
+  [| (0 <= INT_MAX) |] 
+  &&  [| ((INT_MIN) <= 0) |]
+.
+
+Definition mpn_cmp_safety_wit_3 := 
+forall (n_pre: Z) (bp_pre: Z) (ap_pre: Z) (val2: Z) (val1: Z) (cap2: Z) (cap1: Z) (l2: (@list Z)) (l1: (@list Z)) (n: Z) ,
+  [| ((Znth n l1 0) <= (Znth n l2 0)) |] 
+  &&  [| ((Znth n l1 0) <> (Znth n l2 0)) |] 
+  &&  [| (n >= 0) |] 
+  &&  [| ((-1) <= n) |] 
+  &&  [| (n < n_pre) |] 
+  &&  [| (list_store_Z l1 val1 ) |] 
+  &&  [| (list_store_Z l2 val2 ) |] 
+  &&  [| (n_pre = (Zlength (l1))) |] 
+  &&  [| (n_pre = (Zlength (l2))) |] 
+  &&  [| ((sublist ((n + 1 )) (n_pre) (l1)) = (sublist ((n + 1 )) (n_pre) (l2))) |] 
+  &&  [| (list_store_Z l1 val1 ) |] 
+  &&  [| (list_store_Z l2 val2 ) |] 
+  &&  [| (n_pre = (Zlength (l1))) |] 
+  &&  [| (n_pre = (Zlength (l2))) |] 
+  &&  [| (0 < n_pre) |] 
+  &&  [| (n_pre <= cap1) |] 
+  &&  [| (n_pre <= cap2) |] 
+  &&  [| (cap1 <= 100000000) |] 
+  &&  [| (cap2 <= 100000000) |]
+  &&  (store_uint_array bp_pre n_pre l2 )
+  **  (store_uint_array ap_pre n_pre l1 )
+  **  ((( &( "n" ) )) # Int  |-> n)
+  **  (store_undef_uint_array_rec ap_pre (n_pre + 1 ) cap1 )
+  **  (store_undef_uint_array_rec bp_pre (n_pre + 1 ) cap2 )
+  **  ((( &( "bp" ) )) # Ptr  |-> bp_pre)
+  **  ((( &( "ap" ) )) # Ptr  |-> ap_pre)
+|--
+  [| (1 <> (INT_MIN)) |]
+.
+
+Definition mpn_cmp_safety_wit_4 := 
+forall (n_pre: Z) (bp_pre: Z) (ap_pre: Z) (val2: Z) (val1: Z) (cap2: Z) (cap1: Z) (l2: (@list Z)) (l1: (@list Z)) (n: Z) ,
+  [| ((Znth n l1 0) <= (Znth n l2 0)) |] 
+  &&  [| ((Znth n l1 0) <> (Znth n l2 0)) |] 
+  &&  [| (n >= 0) |] 
+  &&  [| ((-1) <= n) |] 
+  &&  [| (n < n_pre) |] 
+  &&  [| (list_store_Z l1 val1 ) |] 
+  &&  [| (list_store_Z l2 val2 ) |] 
+  &&  [| (n_pre = (Zlength (l1))) |] 
+  &&  [| (n_pre = (Zlength (l2))) |] 
+  &&  [| ((sublist ((n + 1 )) (n_pre) (l1)) = (sublist ((n + 1 )) (n_pre) (l2))) |] 
+  &&  [| (list_store_Z l1 val1 ) |] 
+  &&  [| (list_store_Z l2 val2 ) |] 
+  &&  [| (n_pre = (Zlength (l1))) |] 
+  &&  [| (n_pre = (Zlength (l2))) |] 
+  &&  [| (0 < n_pre) |] 
+  &&  [| (n_pre <= cap1) |] 
+  &&  [| (n_pre <= cap2) |] 
+  &&  [| (cap1 <= 100000000) |] 
+  &&  [| (cap2 <= 100000000) |]
+  &&  (store_uint_array bp_pre n_pre l2 )
+  **  (store_uint_array ap_pre n_pre l1 )
+  **  ((( &( "n" ) )) # Int  |-> n)
+  **  (store_undef_uint_array_rec ap_pre (n_pre + 1 ) cap1 )
+  **  (store_undef_uint_array_rec bp_pre (n_pre + 1 ) cap2 )
+  **  ((( &( "bp" ) )) # Ptr  |-> bp_pre)
+  **  ((( &( "ap" ) )) # Ptr  |-> ap_pre)
+|--
+  [| (1 <= INT_MAX) |] 
+  &&  [| ((INT_MIN) <= 1) |]
+.
+
+Definition mpn_cmp_safety_wit_5 := 
+forall (n_pre: Z) (bp_pre: Z) (ap_pre: Z) (val2: Z) (val1: Z) (cap2: Z) (cap1: Z) (l2: (@list Z)) (l1: (@list Z)) (n: Z) ,
+  [| ((Znth n l1 0) > (Znth n l2 0)) |] 
+  &&  [| ((Znth n l1 0) <> (Znth n l2 0)) |] 
+  &&  [| (n >= 0) |] 
+  &&  [| ((-1) <= n) |] 
+  &&  [| (n < n_pre) |] 
+  &&  [| (list_store_Z l1 val1 ) |] 
+  &&  [| (list_store_Z l2 val2 ) |] 
+  &&  [| (n_pre = (Zlength (l1))) |] 
+  &&  [| (n_pre = (Zlength (l2))) |] 
+  &&  [| ((sublist ((n + 1 )) (n_pre) (l1)) = (sublist ((n + 1 )) (n_pre) (l2))) |] 
+  &&  [| (list_store_Z l1 val1 ) |] 
+  &&  [| (list_store_Z l2 val2 ) |] 
+  &&  [| (n_pre = (Zlength (l1))) |] 
+  &&  [| (n_pre = (Zlength (l2))) |] 
+  &&  [| (0 < n_pre) |] 
+  &&  [| (n_pre <= cap1) |] 
+  &&  [| (n_pre <= cap2) |] 
+  &&  [| (cap1 <= 100000000) |] 
+  &&  [| (cap2 <= 100000000) |]
+  &&  (store_uint_array bp_pre n_pre l2 )
+  **  (store_uint_array ap_pre n_pre l1 )
+  **  ((( &( "n" ) )) # Int  |-> n)
+  **  (store_undef_uint_array_rec ap_pre (n_pre + 1 ) cap1 )
+  **  (store_undef_uint_array_rec bp_pre (n_pre + 1 ) cap2 )
+  **  ((( &( "bp" ) )) # Ptr  |-> bp_pre)
+  **  ((( &( "ap" ) )) # Ptr  |-> ap_pre)
+|--
+  [| (1 <= INT_MAX) |] 
+  &&  [| ((INT_MIN) <= 1) |]
+.
+
+Definition mpn_cmp_safety_wit_6 := 
+forall (n_pre: Z) (bp_pre: Z) (ap_pre: Z) (val2: Z) (val1: Z) (cap2: Z) (cap1: Z) (l2: (@list Z)) (l1: (@list Z)) (n: Z) ,
+  [| ((Znth n l1 0) = (Znth n l2 0)) |] 
+  &&  [| (n >= 0) |] 
+  &&  [| ((-1) <= n) |] 
+  &&  [| (n < n_pre) |] 
+  &&  [| (list_store_Z l1 val1 ) |] 
+  &&  [| (list_store_Z l2 val2 ) |] 
+  &&  [| (n_pre = (Zlength (l1))) |] 
+  &&  [| (n_pre = (Zlength (l2))) |] 
+  &&  [| ((sublist ((n + 1 )) (n_pre) (l1)) = (sublist ((n + 1 )) (n_pre) (l2))) |] 
+  &&  [| (list_store_Z l1 val1 ) |] 
+  &&  [| (list_store_Z l2 val2 ) |] 
+  &&  [| (n_pre = (Zlength (l1))) |] 
+  &&  [| (n_pre = (Zlength (l2))) |] 
+  &&  [| (0 < n_pre) |] 
+  &&  [| (n_pre <= cap1) |] 
+  &&  [| (n_pre <= cap2) |] 
+  &&  [| (cap1 <= 100000000) |] 
+  &&  [| (cap2 <= 100000000) |]
+  &&  (store_uint_array bp_pre n_pre l2 )
+  **  (store_uint_array ap_pre n_pre l1 )
+  **  ((( &( "n" ) )) # Int  |-> n)
+  **  (store_undef_uint_array_rec ap_pre (n_pre + 1 ) cap1 )
+  **  (store_undef_uint_array_rec bp_pre (n_pre + 1 ) cap2 )
+  **  ((( &( "bp" ) )) # Ptr  |-> bp_pre)
+  **  ((( &( "ap" ) )) # Ptr  |-> ap_pre)
+|--
+  [| ((n - 1 ) <= INT_MAX) |] 
+  &&  [| ((INT_MIN) <= (n - 1 )) |]
+.
+
+Definition mpn_cmp_safety_wit_7 := 
+forall (n_pre: Z) (bp_pre: Z) (ap_pre: Z) (val2: Z) (val1: Z) (cap2: Z) (cap1: Z) (l2: (@list Z)) (l1: (@list Z)) (n: Z) ,
+  [| (n < 0) |] 
+  &&  [| ((-1) <= n) |] 
+  &&  [| (n < n_pre) |] 
+  &&  [| (list_store_Z l1 val1 ) |] 
+  &&  [| (list_store_Z l2 val2 ) |] 
+  &&  [| (n_pre = (Zlength (l1))) |] 
+  &&  [| (n_pre = (Zlength (l2))) |] 
+  &&  [| ((sublist ((n + 1 )) (n_pre) (l1)) = (sublist ((n + 1 )) (n_pre) (l2))) |] 
+  &&  [| (list_store_Z l1 val1 ) |] 
+  &&  [| (list_store_Z l2 val2 ) |] 
+  &&  [| (n_pre = (Zlength (l1))) |] 
+  &&  [| (n_pre = (Zlength (l2))) |] 
+  &&  [| (0 < n_pre) |] 
+  &&  [| (n_pre <= cap1) |] 
+  &&  [| (n_pre <= cap2) |] 
+  &&  [| (cap1 <= 100000000) |] 
+  &&  [| (cap2 <= 100000000) |]
+  &&  ((( &( "n" ) )) # Int  |-> n)
+  **  (store_uint_array ap_pre n_pre l1 )
+  **  (store_uint_array bp_pre n_pre l2 )
+  **  (store_undef_uint_array_rec ap_pre (n_pre + 1 ) cap1 )
+  **  (store_undef_uint_array_rec bp_pre (n_pre + 1 ) cap2 )
+  **  ((( &( "bp" ) )) # Ptr  |-> bp_pre)
+  **  ((( &( "ap" ) )) # Ptr  |-> ap_pre)
+|--
+  [| (0 <= INT_MAX) |] 
+  &&  [| ((INT_MIN) <= 0) |]
+.
+
+Definition mpn_cmp_entail_wit_1 := 
+forall (n_pre: Z) (bp_pre: Z) (ap_pre: Z) (val2: Z) (val1: Z) (cap2: Z) (cap1: Z) (l2: (@list Z)) (l1: (@list Z)) ,
+  [| (list_store_Z l1 val1 ) |] 
+  &&  [| (list_store_Z l2 val2 ) |] 
+  &&  [| (n_pre = (Zlength (l1))) |] 
+  &&  [| (n_pre = (Zlength (l2))) |] 
+  &&  [| (0 < n_pre) |] 
+  &&  [| (n_pre <= cap1) |] 
+  &&  [| (n_pre <= cap2) |] 
+  &&  [| (cap1 <= 100000000) |] 
+  &&  [| (cap2 <= 100000000) |]
+  &&  (store_uint_array ap_pre n_pre l1 )
+  **  (store_uint_array bp_pre n_pre l2 )
+  **  (store_undef_uint_array_rec ap_pre (n_pre + 1 ) cap1 )
+  **  (store_undef_uint_array_rec bp_pre (n_pre + 1 ) cap2 )
+|--
+  [| ((-1) <= (n_pre - 1 )) |] 
+  &&  [| ((n_pre - 1 ) < n_pre) |] 
+  &&  [| (list_store_Z l1 val1 ) |] 
+  &&  [| (list_store_Z l2 val2 ) |] 
+  &&  [| (n_pre = (Zlength (l1))) |] 
+  &&  [| (n_pre = (Zlength (l2))) |] 
+  &&  [| ((sublist (((n_pre - 1 ) + 1 )) (n_pre) (l1)) = (sublist (((n_pre - 1 ) + 1 )) (n_pre) (l2))) |] 
+  &&  [| (list_store_Z l1 val1 ) |] 
+  &&  [| (list_store_Z l2 val2 ) |] 
+  &&  [| (n_pre = (Zlength (l1))) |] 
+  &&  [| (n_pre = (Zlength (l2))) |] 
+  &&  [| (0 < n_pre) |] 
+  &&  [| (n_pre <= cap1) |] 
+  &&  [| (n_pre <= cap2) |] 
+  &&  [| (cap1 <= 100000000) |] 
+  &&  [| (cap2 <= 100000000) |]
+  &&  (store_uint_array ap_pre n_pre l1 )
+  **  (store_uint_array bp_pre n_pre l2 )
+  **  (store_undef_uint_array_rec ap_pre (n_pre + 1 ) cap1 )
+  **  (store_undef_uint_array_rec bp_pre (n_pre + 1 ) cap2 )
+.
+
+Definition mpn_cmp_entail_wit_2 := 
+forall (n_pre: Z) (bp_pre: Z) (ap_pre: Z) (val2: Z) (val1: Z) (cap2: Z) (cap1: Z) (l2: (@list Z)) (l1: (@list Z)) (n: Z) ,
+  [| ((Znth n l1 0) = (Znth n l2 0)) |] 
+  &&  [| (n >= 0) |] 
+  &&  [| ((-1) <= n) |] 
+  &&  [| (n < n_pre) |] 
+  &&  [| (list_store_Z l1 val1 ) |] 
+  &&  [| (list_store_Z l2 val2 ) |] 
+  &&  [| (n_pre = (Zlength (l1))) |] 
+  &&  [| (n_pre = (Zlength (l2))) |] 
+  &&  [| ((sublist ((n + 1 )) (n_pre) (l1)) = (sublist ((n + 1 )) (n_pre) (l2))) |] 
+  &&  [| (list_store_Z l1 val1 ) |] 
+  &&  [| (list_store_Z l2 val2 ) |] 
+  &&  [| (n_pre = (Zlength (l1))) |] 
+  &&  [| (n_pre = (Zlength (l2))) |] 
+  &&  [| (0 < n_pre) |] 
+  &&  [| (n_pre <= cap1) |] 
+  &&  [| (n_pre <= cap2) |] 
+  &&  [| (cap1 <= 100000000) |] 
+  &&  [| (cap2 <= 100000000) |]
+  &&  (store_uint_array bp_pre n_pre l2 )
+  **  (store_uint_array ap_pre n_pre l1 )
+  **  (store_undef_uint_array_rec ap_pre (n_pre + 1 ) cap1 )
+  **  (store_undef_uint_array_rec bp_pre (n_pre + 1 ) cap2 )
+|--
+  [| ((-1) <= (n - 1 )) |] 
+  &&  [| ((n - 1 ) < n_pre) |] 
+  &&  [| (list_store_Z l1 val1 ) |] 
+  &&  [| (list_store_Z l2 val2 ) |] 
+  &&  [| (n_pre = (Zlength (l1))) |] 
+  &&  [| (n_pre = (Zlength (l2))) |] 
+  &&  [| ((sublist (((n - 1 ) + 1 )) (n_pre) (l1)) = (sublist (((n - 1 ) + 1 )) (n_pre) (l2))) |] 
+  &&  [| (list_store_Z l1 val1 ) |] 
+  &&  [| (list_store_Z l2 val2 ) |] 
+  &&  [| (n_pre = (Zlength (l1))) |] 
+  &&  [| (n_pre = (Zlength (l2))) |] 
+  &&  [| (0 < n_pre) |] 
+  &&  [| (n_pre <= cap1) |] 
+  &&  [| (n_pre <= cap2) |] 
+  &&  [| (cap1 <= 100000000) |] 
+  &&  [| (cap2 <= 100000000) |]
+  &&  (store_uint_array ap_pre n_pre l1 )
+  **  (store_uint_array bp_pre n_pre l2 )
+  **  (store_undef_uint_array_rec ap_pre (n_pre + 1 ) cap1 )
+  **  (store_undef_uint_array_rec bp_pre (n_pre + 1 ) cap2 )
+.
+
+Definition mpn_cmp_return_wit_1_1 := 
+forall (n_pre: Z) (bp_pre: Z) (ap_pre: Z) (val2: Z) (val1: Z) (cap2: Z) (cap1: Z) (l2: (@list Z)) (l1: (@list Z)) (n: Z) ,
+  [| ((Znth n l1 0) <= (Znth n l2 0)) |] 
+  &&  [| ((Znth n l1 0) <> (Znth n l2 0)) |] 
+  &&  [| (n >= 0) |] 
+  &&  [| ((-1) <= n) |] 
+  &&  [| (n < n_pre) |] 
+  &&  [| (list_store_Z l1 val1 ) |] 
+  &&  [| (list_store_Z l2 val2 ) |] 
+  &&  [| (n_pre = (Zlength (l1))) |] 
+  &&  [| (n_pre = (Zlength (l2))) |] 
+  &&  [| ((sublist ((n + 1 )) (n_pre) (l1)) = (sublist ((n + 1 )) (n_pre) (l2))) |] 
+  &&  [| (list_store_Z l1 val1 ) |] 
+  &&  [| (list_store_Z l2 val2 ) |] 
+  &&  [| (n_pre = (Zlength (l1))) |] 
+  &&  [| (n_pre = (Zlength (l2))) |] 
+  &&  [| (0 < n_pre) |] 
+  &&  [| (n_pre <= cap1) |] 
+  &&  [| (n_pre <= cap2) |] 
+  &&  [| (cap1 <= 100000000) |] 
+  &&  [| (cap2 <= 100000000) |]
+  &&  (store_uint_array bp_pre n_pre l2 )
+  **  (store_uint_array ap_pre n_pre l1 )
+  **  (store_undef_uint_array_rec ap_pre (n_pre + 1 ) cap1 )
+  **  (store_undef_uint_array_rec bp_pre (n_pre + 1 ) cap2 )
+|--
+  ([| (val1 < val2) |] 
+  &&  [| ((-1) = (-1)) |]
+  &&  (mpd_store_Z ap_pre val1 n_pre cap1 )
+  **  (mpd_store_Z bp_pre val2 n_pre cap2 ))
+  ||
+  ([| (val1 = val2) |] 
+  &&  [| ((-1) = 0) |]
+  &&  (mpd_store_Z ap_pre val1 n_pre cap1 )
+  **  (mpd_store_Z bp_pre val2 n_pre cap2 ))
+  ||
+  ([| (val1 > val2) |] 
+  &&  [| ((-1) = 1) |]
+  &&  (mpd_store_Z ap_pre val1 n_pre cap1 )
+  **  (mpd_store_Z bp_pre val2 n_pre cap2 ))
+.
+
+Definition mpn_cmp_return_wit_1_2 := 
+forall (n_pre: Z) (bp_pre: Z) (ap_pre: Z) (val2: Z) (val1: Z) (cap2: Z) (cap1: Z) (l2: (@list Z)) (l1: (@list Z)) (n: Z) ,
+  [| ((Znth n l1 0) > (Znth n l2 0)) |] 
+  &&  [| ((Znth n l1 0) <> (Znth n l2 0)) |] 
+  &&  [| (n >= 0) |] 
+  &&  [| ((-1) <= n) |] 
+  &&  [| (n < n_pre) |] 
+  &&  [| (list_store_Z l1 val1 ) |] 
+  &&  [| (list_store_Z l2 val2 ) |] 
+  &&  [| (n_pre = (Zlength (l1))) |] 
+  &&  [| (n_pre = (Zlength (l2))) |] 
+  &&  [| ((sublist ((n + 1 )) (n_pre) (l1)) = (sublist ((n + 1 )) (n_pre) (l2))) |] 
+  &&  [| (list_store_Z l1 val1 ) |] 
+  &&  [| (list_store_Z l2 val2 ) |] 
+  &&  [| (n_pre = (Zlength (l1))) |] 
+  &&  [| (n_pre = (Zlength (l2))) |] 
+  &&  [| (0 < n_pre) |] 
+  &&  [| (n_pre <= cap1) |] 
+  &&  [| (n_pre <= cap2) |] 
+  &&  [| (cap1 <= 100000000) |] 
+  &&  [| (cap2 <= 100000000) |]
+  &&  (store_uint_array bp_pre n_pre l2 )
+  **  (store_uint_array ap_pre n_pre l1 )
+  **  (store_undef_uint_array_rec ap_pre (n_pre + 1 ) cap1 )
+  **  (store_undef_uint_array_rec bp_pre (n_pre + 1 ) cap2 )
+|--
+  ([| (val1 < val2) |] 
+  &&  [| (1 = (-1)) |]
+  &&  (mpd_store_Z ap_pre val1 n_pre cap1 )
+  **  (mpd_store_Z bp_pre val2 n_pre cap2 ))
+  ||
+  ([| (val1 = val2) |] 
+  &&  [| (1 = 0) |]
+  &&  (mpd_store_Z ap_pre val1 n_pre cap1 )
+  **  (mpd_store_Z bp_pre val2 n_pre cap2 ))
+  ||
+  ([| (val1 > val2) |] 
+  &&  [| (1 = 1) |]
+  &&  (mpd_store_Z ap_pre val1 n_pre cap1 )
+  **  (mpd_store_Z bp_pre val2 n_pre cap2 ))
+.
+
+Definition mpn_cmp_return_wit_2 := 
+forall (n_pre: Z) (bp_pre: Z) (ap_pre: Z) (val2: Z) (val1: Z) (cap2: Z) (cap1: Z) (l2: (@list Z)) (l1: (@list Z)) (n: Z) ,
+  [| (n < 0) |] 
+  &&  [| ((-1) <= n) |] 
+  &&  [| (n < n_pre) |] 
+  &&  [| (list_store_Z l1 val1 ) |] 
+  &&  [| (list_store_Z l2 val2 ) |] 
+  &&  [| (n_pre = (Zlength (l1))) |] 
+  &&  [| (n_pre = (Zlength (l2))) |] 
+  &&  [| ((sublist ((n + 1 )) (n_pre) (l1)) = (sublist ((n + 1 )) (n_pre) (l2))) |] 
+  &&  [| (list_store_Z l1 val1 ) |] 
+  &&  [| (list_store_Z l2 val2 ) |] 
+  &&  [| (n_pre = (Zlength (l1))) |] 
+  &&  [| (n_pre = (Zlength (l2))) |] 
+  &&  [| (0 < n_pre) |] 
+  &&  [| (n_pre <= cap1) |] 
+  &&  [| (n_pre <= cap2) |] 
+  &&  [| (cap1 <= 100000000) |] 
+  &&  [| (cap2 <= 100000000) |]
+  &&  (store_uint_array ap_pre n_pre l1 )
+  **  (store_uint_array bp_pre n_pre l2 )
+  **  (store_undef_uint_array_rec ap_pre (n_pre + 1 ) cap1 )
+  **  (store_undef_uint_array_rec bp_pre (n_pre + 1 ) cap2 )
+|--
+  ([| (val1 < val2) |] 
+  &&  [| (0 = (-1)) |]
+  &&  (mpd_store_Z ap_pre val1 n_pre cap1 )
+  **  (mpd_store_Z bp_pre val2 n_pre cap2 ))
+  ||
+  ([| (val1 = val2) |] 
+  &&  [| (0 = 0) |]
+  &&  (mpd_store_Z ap_pre val1 n_pre cap1 )
+  **  (mpd_store_Z bp_pre val2 n_pre cap2 ))
+  ||
+  ([| (val1 > val2) |] 
+  &&  [| (0 = 1) |]
+  &&  (mpd_store_Z ap_pre val1 n_pre cap1 )
+  **  (mpd_store_Z bp_pre val2 n_pre cap2 ))
+.
+
+Definition mpn_cmp_partial_solve_wit_1 := 
+forall (n_pre: Z) (bp_pre: Z) (ap_pre: Z) (val2: Z) (val1: Z) (cap2: Z) (cap1: Z) ,
+  [| (0 < n_pre) |] 
+  &&  [| (n_pre <= cap1) |] 
+  &&  [| (n_pre <= cap2) |] 
+  &&  [| (cap1 <= 100000000) |] 
+  &&  [| (cap2 <= 100000000) |]
+  &&  (mpd_store_Z ap_pre val1 n_pre cap1 )
+  **  (mpd_store_Z bp_pre val2 n_pre cap2 )
+|--
+  [| (0 < n_pre) |] 
+  &&  [| (n_pre <= cap1) |] 
+  &&  [| (n_pre <= cap2) |] 
+  &&  [| (cap1 <= 100000000) |] 
+  &&  [| (cap2 <= 100000000) |]
+  &&  (mpd_store_Z ap_pre val1 n_pre cap1 )
+  **  (mpd_store_Z bp_pre val2 n_pre cap2 )
+.
+
+Definition mpn_cmp_partial_solve_wit_2 := 
+forall (n_pre: Z) (bp_pre: Z) (ap_pre: Z) (val2: Z) (val1: Z) (cap2: Z) (cap1: Z) (l2: (@list Z)) (l1: (@list Z)) (n: Z) ,
+  [| (n >= 0) |] 
+  &&  [| ((-1) <= n) |] 
+  &&  [| (n < n_pre) |] 
+  &&  [| (list_store_Z l1 val1 ) |] 
+  &&  [| (list_store_Z l2 val2 ) |] 
+  &&  [| (n_pre = (Zlength (l1))) |] 
+  &&  [| (n_pre = (Zlength (l2))) |] 
+  &&  [| ((sublist ((n + 1 )) (n_pre) (l1)) = (sublist ((n + 1 )) (n_pre) (l2))) |] 
+  &&  [| (list_store_Z l1 val1 ) |] 
+  &&  [| (list_store_Z l2 val2 ) |] 
+  &&  [| (n_pre = (Zlength (l1))) |] 
+  &&  [| (n_pre = (Zlength (l2))) |] 
+  &&  [| (0 < n_pre) |] 
+  &&  [| (n_pre <= cap1) |] 
+  &&  [| (n_pre <= cap2) |] 
+  &&  [| (cap1 <= 100000000) |] 
+  &&  [| (cap2 <= 100000000) |]
+  &&  (store_uint_array ap_pre n_pre l1 )
+  **  (store_uint_array bp_pre n_pre l2 )
+  **  (store_undef_uint_array_rec ap_pre (n_pre + 1 ) cap1 )
+  **  (store_undef_uint_array_rec bp_pre (n_pre + 1 ) cap2 )
+|--
+  [| (n >= 0) |] 
+  &&  [| ((-1) <= n) |] 
+  &&  [| (n < n_pre) |] 
+  &&  [| (list_store_Z l1 val1 ) |] 
+  &&  [| (list_store_Z l2 val2 ) |] 
+  &&  [| (n_pre = (Zlength (l1))) |] 
+  &&  [| (n_pre = (Zlength (l2))) |] 
+  &&  [| ((sublist ((n + 1 )) (n_pre) (l1)) = (sublist ((n + 1 )) (n_pre) (l2))) |] 
+  &&  [| (list_store_Z l1 val1 ) |] 
+  &&  [| (list_store_Z l2 val2 ) |] 
+  &&  [| (n_pre = (Zlength (l1))) |] 
+  &&  [| (n_pre = (Zlength (l2))) |] 
+  &&  [| (0 < n_pre) |] 
+  &&  [| (n_pre <= cap1) |] 
+  &&  [| (n_pre <= cap2) |] 
+  &&  [| (cap1 <= 100000000) |] 
+  &&  [| (cap2 <= 100000000) |]
+  &&  (((ap_pre + (n * sizeof(UINT) ) )) # UInt  |-> (Znth n l1 0))
+  **  (store_uint_array_missing_i_rec ap_pre n 0 n_pre l1 )
+  **  (store_uint_array bp_pre n_pre l2 )
+  **  (store_undef_uint_array_rec ap_pre (n_pre + 1 ) cap1 )
+  **  (store_undef_uint_array_rec bp_pre (n_pre + 1 ) cap2 )
+.
+
+Definition mpn_cmp_partial_solve_wit_3 := 
+forall (n_pre: Z) (bp_pre: Z) (ap_pre: Z) (val2: Z) (val1: Z) (cap2: Z) (cap1: Z) (l2: (@list Z)) (l1: (@list Z)) (n: Z) ,
+  [| (n >= 0) |] 
+  &&  [| ((-1) <= n) |] 
+  &&  [| (n < n_pre) |] 
+  &&  [| (list_store_Z l1 val1 ) |] 
+  &&  [| (list_store_Z l2 val2 ) |] 
+  &&  [| (n_pre = (Zlength (l1))) |] 
+  &&  [| (n_pre = (Zlength (l2))) |] 
+  &&  [| ((sublist ((n + 1 )) (n_pre) (l1)) = (sublist ((n + 1 )) (n_pre) (l2))) |] 
+  &&  [| (list_store_Z l1 val1 ) |] 
+  &&  [| (list_store_Z l2 val2 ) |] 
+  &&  [| (n_pre = (Zlength (l1))) |] 
+  &&  [| (n_pre = (Zlength (l2))) |] 
+  &&  [| (0 < n_pre) |] 
+  &&  [| (n_pre <= cap1) |] 
+  &&  [| (n_pre <= cap2) |] 
+  &&  [| (cap1 <= 100000000) |] 
+  &&  [| (cap2 <= 100000000) |]
+  &&  (store_uint_array ap_pre n_pre l1 )
+  **  (store_uint_array bp_pre n_pre l2 )
+  **  (store_undef_uint_array_rec ap_pre (n_pre + 1 ) cap1 )
+  **  (store_undef_uint_array_rec bp_pre (n_pre + 1 ) cap2 )
+|--
+  [| (n >= 0) |] 
+  &&  [| ((-1) <= n) |] 
+  &&  [| (n < n_pre) |] 
+  &&  [| (list_store_Z l1 val1 ) |] 
+  &&  [| (list_store_Z l2 val2 ) |] 
+  &&  [| (n_pre = (Zlength (l1))) |] 
+  &&  [| (n_pre = (Zlength (l2))) |] 
+  &&  [| ((sublist ((n + 1 )) (n_pre) (l1)) = (sublist ((n + 1 )) (n_pre) (l2))) |] 
+  &&  [| (list_store_Z l1 val1 ) |] 
+  &&  [| (list_store_Z l2 val2 ) |] 
+  &&  [| (n_pre = (Zlength (l1))) |] 
+  &&  [| (n_pre = (Zlength (l2))) |] 
+  &&  [| (0 < n_pre) |] 
+  &&  [| (n_pre <= cap1) |] 
+  &&  [| (n_pre <= cap2) |] 
+  &&  [| (cap1 <= 100000000) |] 
+  &&  [| (cap2 <= 100000000) |]
+  &&  (((bp_pre + (n * sizeof(UINT) ) )) # UInt  |-> (Znth n l2 0))
+  **  (store_uint_array_missing_i_rec bp_pre n 0 n_pre l2 )
+  **  (store_uint_array ap_pre n_pre l1 )
+  **  (store_undef_uint_array_rec ap_pre (n_pre + 1 ) cap1 )
+  **  (store_undef_uint_array_rec bp_pre (n_pre + 1 ) cap2 )
+.
+
+Definition mpn_cmp_which_implies_wit_1 := 
+forall (n_pre: Z) (bp_pre: Z) (ap_pre: Z) (val2: Z) (val1: Z) (cap2: Z) (cap1: Z) ,
+  (mpd_store_Z ap_pre val1 n_pre cap1 )
+  **  (mpd_store_Z bp_pre val2 n_pre cap2 )
+|--
+  EX (l2: (@list Z))  (l1: (@list Z)) ,
+  [| (list_store_Z l1 val1 ) |] 
+  &&  [| (list_store_Z l2 val2 ) |] 
+  &&  [| (n_pre = (Zlength (l1))) |] 
+  &&  [| (n_pre = (Zlength (l2))) |]
+  &&  (store_uint_array ap_pre n_pre l1 )
+  **  (store_uint_array bp_pre n_pre l2 )
+  **  (store_undef_uint_array_rec ap_pre (n_pre + 1 ) cap1 )
+  **  (store_undef_uint_array_rec bp_pre (n_pre + 1 ) cap2 )
+.
+
 Module Type VC_Correct.
 
 Axiom proof_of_gmp_abs_safety_wit_1 : gmp_abs_safety_wit_1.
@@ -620,5 +1176,21 @@ Axiom proof_of_mpn_copyi_partial_solve_wit_5 : mpn_copyi_partial_solve_wit_5.
 Axiom proof_of_mpn_copyi_which_implies_wit_1 : mpn_copyi_which_implies_wit_1.
 Axiom proof_of_mpn_copyi_which_implies_wit_2 : mpn_copyi_which_implies_wit_2.
 Axiom proof_of_mpn_copyi_which_implies_wit_3 : mpn_copyi_which_implies_wit_3.
+Axiom proof_of_mpn_cmp_safety_wit_1 : mpn_cmp_safety_wit_1.
+Axiom proof_of_mpn_cmp_safety_wit_2 : mpn_cmp_safety_wit_2.
+Axiom proof_of_mpn_cmp_safety_wit_3 : mpn_cmp_safety_wit_3.
+Axiom proof_of_mpn_cmp_safety_wit_4 : mpn_cmp_safety_wit_4.
+Axiom proof_of_mpn_cmp_safety_wit_5 : mpn_cmp_safety_wit_5.
+Axiom proof_of_mpn_cmp_safety_wit_6 : mpn_cmp_safety_wit_6.
+Axiom proof_of_mpn_cmp_safety_wit_7 : mpn_cmp_safety_wit_7.
+Axiom proof_of_mpn_cmp_entail_wit_1 : mpn_cmp_entail_wit_1.
+Axiom proof_of_mpn_cmp_entail_wit_2 : mpn_cmp_entail_wit_2.
+Axiom proof_of_mpn_cmp_return_wit_1_1 : mpn_cmp_return_wit_1_1.
+Axiom proof_of_mpn_cmp_return_wit_1_2 : mpn_cmp_return_wit_1_2.
+Axiom proof_of_mpn_cmp_return_wit_2 : mpn_cmp_return_wit_2.
+Axiom proof_of_mpn_cmp_partial_solve_wit_1 : mpn_cmp_partial_solve_wit_1.
+Axiom proof_of_mpn_cmp_partial_solve_wit_2 : mpn_cmp_partial_solve_wit_2.
+Axiom proof_of_mpn_cmp_partial_solve_wit_3 : mpn_cmp_partial_solve_wit_3.
+Axiom proof_of_mpn_cmp_which_implies_wit_1 : mpn_cmp_which_implies_wit_1.
 
 End VC_Correct.
diff --git a/projects/lib/gmp_goal_check.v b/projects/lib/gmp_goal_check.v
index 43755db..81ae445 100644
--- a/projects/lib/gmp_goal_check.v
+++ b/projects/lib/gmp_goal_check.v
@@ -1,6 +1,6 @@
-From  Require Import gmp_goal gmp_proof_auto gmp_proof_manual.
+From  Require Import gmp_goal gmp_proof_auto gmp_proof_manual_tmp.
 
 Module VC_Correctness : VC_Correct.
   Include gmp_proof_auto.
-  Include gmp_proof_manual.
+  Include gmp_proof_manual_tmp.
 End VC_Correctness.
diff --git a/projects/lib/gmp_proof_auto.v b/projects/lib/gmp_proof_auto.v
index 1cb2659..300c3f1 100644
--- a/projects/lib/gmp_proof_auto.v
+++ b/projects/lib/gmp_proof_auto.v
@@ -63,3 +63,33 @@ Proof. Admitted.
 Lemma proof_of_mpn_copyi_partial_solve_wit_5 : mpn_copyi_partial_solve_wit_5.
 Proof. Admitted. 
 
+Lemma proof_of_mpn_cmp_safety_wit_1 : mpn_cmp_safety_wit_1.
+Proof. Admitted. 
+
+Lemma proof_of_mpn_cmp_safety_wit_2 : mpn_cmp_safety_wit_2.
+Proof. Admitted. 
+
+Lemma proof_of_mpn_cmp_safety_wit_3 : mpn_cmp_safety_wit_3.
+Proof. Admitted. 
+
+Lemma proof_of_mpn_cmp_safety_wit_4 : mpn_cmp_safety_wit_4.
+Proof. Admitted. 
+
+Lemma proof_of_mpn_cmp_safety_wit_5 : mpn_cmp_safety_wit_5.
+Proof. Admitted. 
+
+Lemma proof_of_mpn_cmp_safety_wit_6 : mpn_cmp_safety_wit_6.
+Proof. Admitted. 
+
+Lemma proof_of_mpn_cmp_safety_wit_7 : mpn_cmp_safety_wit_7.
+Proof. Admitted. 
+
+Lemma proof_of_mpn_cmp_partial_solve_wit_1 : mpn_cmp_partial_solve_wit_1.
+Proof. Admitted. 
+
+Lemma proof_of_mpn_cmp_partial_solve_wit_2 : mpn_cmp_partial_solve_wit_2.
+Proof. Admitted. 
+
+Lemma proof_of_mpn_cmp_partial_solve_wit_3 : mpn_cmp_partial_solve_wit_3.
+Proof. Admitted. 
+
diff --git a/projects/lib/gmp_proof_manual.v b/projects/lib/gmp_proof_manual.v
index 5fbd764..5278efd 100644
--- a/projects/lib/gmp_proof_manual.v
+++ b/projects/lib/gmp_proof_manual.v
@@ -149,4 +149,95 @@ Proof.
     rewrite H5 in H4; clear H5.
     rewrite <-H4.
     sep_apply store_uint_array_rec_tail_merge; [ reflexivity | lia ].
+Qed.
+
+Lemma proof_of_mpn_cmp_safety_wit_1 : mpn_cmp_safety_wit_1.
+Proof.
+  pre_process.
+Qed.
+
+Lemma proof_of_mpn_cmp_entail_wit_1 : mpn_cmp_entail_wit_1.
+Proof.
+  pre_process.
+  entailer!.
+  assert (n_pre - 1 + 1 = n_pre). { lia. }
+  rewrite H8; clear H8.
+  pose proof (Zlength_sublist n_pre n_pre l1 ltac:(lia)).
+  pose proof (Zlength_nil_inv (sublist n_pre n_pre l1) ltac:(lia)).
+  rewrite H9.
+  pose proof (Zlength_sublist n_pre n_pre l2 ltac:(lia)).
+  pose proof (Zlength_nil_inv (sublist n_pre n_pre l2) ltac:(lia)).
+  rewrite H11.
+  reflexivity.
+Qed.
+
+Lemma proof_of_mpn_cmp_entail_wit_2 : mpn_cmp_entail_wit_2.
+Proof.
+  pre_process.
+  entailer!; try lia.
+  assert (n - 1 + 1 = n). { lia. }
+  rewrite H17; clear H17.
+  assert (n_pre <= Z.of_nat (Datatypes.length l1)). {
+    rewrite <-Zlength_correct.
+    lia.
+  }
+  assert (n_pre <= Z.of_nat (Datatypes.length l2)). {
+    rewrite <-Zlength_correct.
+    lia.
+  }
+  rewrite (sublist_split n n_pre (n + 1) l1 ltac:(lia) ltac:(lia)).
+  rewrite (sublist_split n n_pre (n + 1) l2 ltac:(lia) ltac:(lia)).
+  rewrite (sublist_single n l1 0 ltac:(lia)).
+  rewrite (sublist_single n l2 0 ltac:(lia)).
+  rewrite H.
+  rewrite H7.
+  reflexivity.
+Qed.
+
+Lemma proof_of_mpn_cmp_return_wit_1_1 : mpn_cmp_return_wit_1_1.
+Proof.
+  pre_process.
+  entailer!.
+  repeat rewrite <-derivable1_orp_intros1.
+  entailer!.
+  + unfold mpd_store_Z.
+    Exists l1 l2.
+    unfold mpd_store_list.
+    entailer!.
+    rewrite <-H6, <-H7.
+    entailer!.
+  + assert (Znth n l1 0 < Znth n l2 0). { lia. }
+    clear H H0.
+    apply (list_store_Z_cmp l1 l2 val1 val2 n ltac:(lia) ltac:(lia) H4 H5).
+    - rewrite <-H6, <-H7.
+      tauto.
+    - lia.
+Qed.
+
+Lemma proof_of_mpn_cmp_return_wit_1_2 : mpn_cmp_return_wit_1_2.
+Proof.
+  pre_process.
+  rewrite <-derivable1_orp_intros2.
+  entailer!.
+  + unfold mpd_store_Z, mpd_store_list.
+    Exists l1 l2.
+    rewrite <-H6, <-H7.
+    entailer!.
+  + pose proof (list_store_Z_cmp l2 l1 val2 val1 n ltac:(lia) ltac:(lia) H5 H4).
+    rewrite <-H6, <-H7 in H18.
+    rewrite H8 in H18.
+    specialize (H18 ltac:(reflexivity) ltac:(lia)).
+    lia.
+Qed.
+
+Lemma proof_of_mpn_cmp_which_implies_wit_1 : mpn_cmp_which_implies_wit_1.
+Proof.
+  pre_process.
+  unfold mpd_store_Z.
+  Intros l1 l2.
+  Exists l2 l1.
+  unfold mpd_store_list.
+  entailer!.
+  rewrite <-H4, <-H6.
+  entailer!.
 Qed.
\ No newline at end of file
diff --git a/projects/mini-gmp.c b/projects/mini-gmp.c
index 734d342..1f69d74 100755
--- a/projects/mini-gmp.c
+++ b/projects/mini-gmp.c
@@ -104,44 +104,46 @@ mpn_cmp (unsigned int *ap, unsigned int *bp, int n)
   Require
     mpd_store_Z(ap, val1, n, cap1) *
     mpd_store_Z(bp, val2, n, cap2) &&
-    n <= cap1 && n <= cap2
+    0 < n && n <= cap1 && n <= cap2 && 
+    cap1 <= 100000000 && cap2 <= 100000000
   Ensure
-    val1 > val2 && __return == 1 ||
+    (val1 > val2 && __return == 1 ||
     val1 == val2 && __return == 0 ||
-    val1 < val2 && __return == -1
+    val1 < val2 && __return == -1) &&
+    mpd_store_Z(ap@pre, val1, n@pre, cap1) *
+    mpd_store_Z(bp@pre, val2, n@pre, cap2)
 */
 {
   /*@
-    mpd_store_Z(ap, val1, n, cap1) * mpd_store_Z(bp, val2, n, cap2)
+    mpd_store_Z(ap@pre, val1, n@pre, cap1) * mpd_store_Z(bp@pre, val2, n@pre, cap2)
     which implies
     exists l1 l2,
-    mpd_store_list(ap, l1, cap1) * mpd_store_list(bp, l2, cap2) &&
+    store_uint_array(ap@pre, n@pre, l1) * store_uint_array(bp@pre, n@pre, l2) *
+    store_undef_uint_array_rec(ap@pre, n@pre + 1, cap1) * 
+    store_undef_uint_array_rec(bp@pre, n@pre + 1, cap2) &&
     list_store_Z(l1, val1) && list_store_Z(l2, val2) &&
-    n == Zlength(l1) && n == Zlength(l2)
+    n@pre == Zlength(l1) && n@pre == Zlength(l2)
   */
   /*@
     Given l1 l2
   */
   --n;
   /*@Inv
-    mpd_store_list(ap, l1, cap1) * mpd_store_list(bp, l2, cap2) &&
+    -1 <= n && n < n@pre &&
+    store_uint_array(ap@pre, n@pre, l1) * store_uint_array(bp@pre, n@pre, l2) *
+    store_undef_uint_array_rec(ap@pre, n@pre + 1, cap1) * 
+    store_undef_uint_array_rec(bp@pre, n@pre + 1, cap2) &&
     list_store_Z(l1, val1) && list_store_Z(l2, val2) &&
     n@pre == Zlength(l1) && n@pre == Zlength(l2) &&
-    sublist(n, n@pre, l1) == sublist(n, n@pre, l2)
+    sublist(n + 1, n@pre, l1) == sublist(n + 1, n@pre, l2)
   */
   while (n >= 0)
     {
-      /*@
-        mpd_store_list(ap, l1, cap1) * mpd_store_list(bp, l2, cap2)
-        which implies
-        store_uint_array(ap, n, l1) * store_uint_array(bp, n, l2) *
-        store_undef_uint_array(ap, n + 1, cap1) * store_uint_array(bp, n + 1, cap2) &&
-      */
       if (ap[n] != bp[n])
 	      return ap[n] > bp[n] ? 1 : -1;
       --n;
     }
-  // Note: The parser cannot parse "--n" in loop so we paraphrased it.
+  // Note: The parser cannot parse "--n" in loop condition so we paraphrased it.
   /*
   while (--n >= 0)
     {