From: Claudio Sacerdoti Coen Date: Fri, 13 Jul 2007 08:35:47 +0000 (+0000) Subject: Final theorem proved. Many many conjectures left. I am unsure of one of them. X-Git-Tag: make_still_working~6192 X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=commitdiff_plain;h=2ac24b52dbb918e56b6754524881007c6cd088b0;p=helm.git Final theorem proved. Many many conjectures left. I am unsure of one of them. --- diff --git a/helm/software/matita/library/assembly/assembly.ma b/helm/software/matita/library/assembly/assembly.ma index 6a3494267..c9582c830 100644 --- a/helm/software/matita/library/assembly/assembly.ma +++ b/helm/software/matita/library/assembly/assembly.ma @@ -2112,12 +2112,21 @@ lemma plusbyteenc_S: elim daemon. qed. -(* +lemma eq_plusbytec_x0_x0_x_false: + ∀x.plusbytec (mk_byte x0 x0) x = false. + intro; + elim x; + elim e; + elim e1; + reflexivity. +qed. + lemma loop_invariant': ∀x,y:byte.∀j:nat. j ≤ y → execute (mult_status x y) (5 + 23*j) = - mk_status (byte_of_nat (x * j)) 4 0 (eqbyte (mk_byte x0 x0) (byte_of_nat (x*j))) false + mk_status (byte_of_nat (x * j)) 4 0 (eqbyte (mk_byte x0 x0) (byte_of_nat (x*j))) + (plusbytec (byte_of_nat (x*pred j)) x) (update (update (update (mult_memory x y) 30 x) 31 (byte_of_nat (y - j))) 32 (byte_of_nat (x * j))) 0. @@ -2125,7 +2134,10 @@ lemma loop_invariant': elim j; [ do 2 (rewrite < times_n_O); apply status_eq; - [1,2,3,4,5,7: normalize; reflexivity + [1,2,3,4,7: normalize; reflexivity + | rewrite > eq_plusbytec_x0_x0_x_false; + normalize; + reflexivity | intro; elim daemon ] @@ -2145,32 +2157,29 @@ lemma loop_invariant': [ elim Hcut; clear Hcut; elim H; clear H; rewrite > H2; - (* instruction 1 *) + (* instruction LDAd *) letin K ≝ (breakpoint - (mk_status (byte_of_nat (x*n)) 4 O true false + (mk_status (byte_of_nat (x*n)) 4 O + (eqbyte (mk_byte x0 x0) (byte_of_nat (x*n))) + (plusbytec (byte_of_nat (x*pred n)) x) (update (update (update (mult_memory x y) 30 x) 31 (byte_of_nat (S a))) 32 (byte_of_nat (x*n))) O) 3 20); clearbody K; normalize in K:(? ? (? ? %) ?); apply transitive_eq; [2: apply K | skip | ]; clear K; - change in ⊢ (? ? (? % ?) ?) with - (mk_status - (byte_of_nat (S a)) - 6 - 0 - (eqbyte (mk_byte x0 x0) (byte_of_nat (S a))) - false - (update - (update (update (mult_memory x y) 30 x) - 31 (byte_of_nat (S a))) - 32 (byte_of_nat (x*n))) - 0); - (* instruction 2 *) + whd in ⊢ (? ? (? % ?) ?); + normalize in ⊢ (? ? (? (? ? % ? ? ? ? ?) ?) ?); + change in ⊢ (? ? (? (? % ? ? ? ? ? ?) ?) ?) + with (byte_of_nat (S a)); + change in ⊢ (? ? (? (? ? ? ? (? ? %) ? ? ?) ?) ?) with + (byte_of_nat (S a)); + (* instruction BEQ *) letin K ≝ (breakpoint (mk_status (byte_of_nat (S a)) 6 O - (eqbyte (mk_byte x0 x0) (byte_of_nat (S a))) false + (eqbyte (mk_byte x0 x0) (byte_of_nat (S a))) + (plusbytec (byte_of_nat (x*pred n)) x) (update (update (update (mult_memory x y) 30 x) 31 (byte_of_nat (S a))) 32 (byte_of_nat (x*n))) O) 3 17); clearbody K; @@ -2180,11 +2189,12 @@ lemma loop_invariant': letin K ≝ (eq_eqbyte_x0_x0_byte_of_nat_S_false ? H3); clearbody K; rewrite > K; clear K; simplify in ⊢ (? ? (? (? ? % ? ? ? ? ?) ?) ?); - (* instruction 3 *) + (* instruction LDAd *) letin K ≝ (breakpoint (mk_status (byte_of_nat (S a)) 8 O - (eqbyte (mk_byte x0 x0) (byte_of_nat (S a))) false + (eqbyte (mk_byte x0 x0) (byte_of_nat (S a))) + (plusbytec (byte_of_nat (x*pred n)) x) (update (update (update (mult_memory x y) 30 x) 31 (byte_of_nat (S a))) 32 (byte_of_nat (x*n))) O) 3 14); clearbody K; @@ -2198,7 +2208,8 @@ lemma loop_invariant': letin K ≝ (breakpoint (mk_status (byte_of_nat (x*n)) 10 O - (eqbyte (mk_byte x0 x0) (byte_of_nat (x*n))) false + (eqbyte (mk_byte x0 x0) (byte_of_nat (x*n))) + (plusbytec (byte_of_nat (x*pred n)) x) (update (update (update (mult_memory x y) 30 x) 31 (byte_of_nat (S a))) 32 (byte_of_nat (x*n))) O) 5 9); clearbody K; @@ -2216,7 +2227,8 @@ lemma loop_invariant': letin K ≝ (breakpoint (mk_status (byte_of_nat (x*n)) 12 - O (eqbyte (mk_byte x0 x0) (byte_of_nat (y-S n))) false + O (eqbyte (mk_byte x0 x0) (byte_of_nat (y-S n))) + (plusbytec (byte_of_nat (x*pred n)) x) (update (update (update (update (mult_memory x y) 30 x) 31 (byte_of_nat (S (y-S n)))) 32 (byte_of_nat (x*n))) 31 @@ -2230,21 +2242,15 @@ lemma loop_invariant': change in ⊢ (? ? (? (? ? ? ? (? ? %) ? ? ?) ?) ?) with (plusbytenc (byte_of_nat (x*n)) x); normalize in ⊢ (? ? (? (? ? % ? ? ? ? ?) ?) ?); - normalize in \vdash (? ? - (? - (? ? ? ? ? match ? ? % ? in cartesian_product return ? with [couple\rArr ?] ? ?) - ?) ?); + change in ⊢ (? ? (? (? ? ? ? ? % ? ?) ?) ?) + with (plusbytec (byte_of_nat (x*n)) x); rewrite > plusbyteenc_S; (* instruction STAd *) letin K ≝ (breakpoint (mk_status (byte_of_nat (x*S n)) 14 O (eqbyte (mk_byte x0 x0) (byte_of_nat (x*S n))) - match plusbyte (byte_of_nat (x*n)) x false - in cartesian_product - return \lambda c:(cartesian_product byte bool).bool - with - [couple (_:byte) (c':bool)\rArr c'] + (plusbytec (byte_of_nat (x*n)) x) (update (update (update (update (mult_memory x y) 30 x) 31 (byte_of_nat (S (y-S n)))) 32 (byte_of_nat (x*n))) 31 @@ -2257,11 +2263,14 @@ lemma loop_invariant': (* instruction BRA *) whd in ⊢ (? ? % ?); normalize in ⊢ (? ? (? ? % ? ? ? ? ?) ?); + rewrite < pred_Sn; apply status_eq; [1,2,3,4,7: normalize; reflexivity + | change with (plusbytec (byte_of_nat (x*n)) x = + plusbytec (byte_of_nat (x*n)) x); + reflexivity |6: intro; elim daemon - |5: FALSO! ] | exists; [ apply (y - S n) @@ -2275,41 +2284,35 @@ lemma loop_invariant': ] ] ] - | autobatch paramodulation + | rewrite > associative_plus; + autobatch paramodulation ] ] qed. theorem test_x_y: - ∀x,y. - let i ≝ 14 + 23 * nat_of_byte y in - let s ≝ execute (mult_status x y) i in - pc s = 20 ∧ mem s 32 = byte_of_nat (nat_of_byte x * nat_of_byte y). + ∀x,y:byte. + let i ≝ 14 + 23 * y in + execute (mult_status x y) i = + mk_status (byte_of_nat (x*y)) 20 0 + (eqbyte (mk_byte x0 x0) (byte_of_nat (x*y))) + (plusbytec (byte_of_nat (x*pred y)) x) + (update + (update (mult_memory x y) 31 (mk_byte x0 x0)) + 32 (byte_of_nat (x*y))) + 0. intros; - generalize in match (loop_invariant' x y y (le_n y)); intro; - generalize in match (breakpoint (mult_status x y) (5 + 23*y) 9); intro; - cut (5 + 23*y +9 = 14 + 23* y); - [2: autobatch paramodulation - | rewrite > Hcut in H1; - change in H1:(? ? % ?) with s; - letin s0 ≝ (execute (mult_status x y) (S (S (S (S (S O))))+S 22*y)); - generalize in match H; intro K; clear H; - change in K with - (s0 = - mk_status (byte_of_nat (x*y)) 4 0 true false - (update - (update - (update (mult_memory x y) 30 x) - 31 (byte_of_nat (y-y))) - 32 (byte_of_nat (x*y))) O); - clear Hcut; - generalize in match H1; intro K1; clear H1; - change in K1 with (s = execute s0 9); - rewrite > K in K1; - clear K; clear s0; clearbody s; clear i; - rewrite < minus_n_n in K1; - split; - rewrite > K1; - reflexivity - ] -qed.*) \ No newline at end of file + cut (14 + 23 * y = 5 + 23*y + 9); + [2: autobatch paramodulation; + | rewrite > Hcut; (* clear Hcut; *) + rewrite > (breakpoint (mult_status x y) (5 + 23*y) 9); + rewrite > loop_invariant'; + [2: apply le_n + | rewrite < minus_n_n; + apply status_eq; + [1,2,3,4,5,7: normalize; reflexivity + | elim daemon + ] + ] + ]. +qed. \ No newline at end of file