From 17f479648a2912e6a7c8c20664645f22a75cf1b8 Mon Sep 17 00:00:00 2001
From: Yann Herklotz <git@yannherklotz.com>
Date: Fri, 12 May 2023 18:36:34 +0100
Subject: Rename backwards proof

---
 src/hls/GiblePargenproofBackward.v | 96 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 96 insertions(+)
 create mode 100644 src/hls/GiblePargenproofBackward.v

(limited to 'src/hls/GiblePargenproofBackward.v')

diff --git a/src/hls/GiblePargenproofBackward.v b/src/hls/GiblePargenproofBackward.v
new file mode 100644
index 0000000..e2bb23c
--- /dev/null
+++ b/src/hls/GiblePargenproofBackward.v
@@ -0,0 +1,96 @@
+(*
+ * Vericert: Verified high-level synthesis.
+ * Copyright (C) 2023 Yann Herklotz <git@yannherklotz.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *)
+
+Require Import compcert.backend.Registers.
+Require Import compcert.common.AST.
+Require Import compcert.common.Errors.
+Require Import compcert.common.Linking.
+Require Import compcert.common.Globalenvs.
+Require Import compcert.common.Memory.
+Require Import compcert.common.Values.
+Require Import compcert.lib.Maps.
+
+Require Import vericert.common.Vericertlib.
+Require Import vericert.hls.GibleSeq.
+Require Import vericert.hls.GiblePar.
+Require Import vericert.hls.Gible.
+Require Import vericert.hls.GiblePargenproofEquiv.
+Require Import vericert.hls.GiblePargen.
+Require Import vericert.hls.Predicate.
+Require Import vericert.hls.Abstr.
+Require Import vericert.common.Monad.
+
+Module Import OptionExtra := MonadExtra(Option).
+
+#[local] Open Scope positive.
+#[local] Open Scope forest.
+#[local] Open Scope pred_op.
+
+#[local] Opaque simplify.
+#[local] Opaque deep_simplify.
+
+#[local] Ltac destr := destruct_match; try discriminate; [].
+
+Definition state_lessdef := GiblePargenproofEquiv.match_states.
+
+(*|
+===================================
+GiblePar to Abstr Translation Proof
+===================================
+
+This proof is for the correctness of the translation from the parallel Gible
+program into the Abstr language, which is the symbolic execution language.  The
+main characteristic of this proof is that it has to be performed backwards, as
+the translation goes from GiblePar to Abstr, whereas the correctness proof is
+needed from Abstr to GiblePar to get the proper direction of the proof.
+|*)
+
+Section CORRECTNESS.
+
+Context (prog: GibleSeq.program) (tprog : GiblePar.program).
+
+Let ge : GibleSeq.genv := Globalenvs.Genv.globalenv prog.
+Let tge : GiblePar.genv := Globalenvs.Genv.globalenv tprog.
+
+Lemma abstr_seq_reverse_correct :
+  forall sp x i i' ti cf x',
+    abstract_sequence x = Some x' ->
+    sem (mk_ctx i sp ge) x' (i', (Some cf)) ->
+    state_lessdef i ti ->
+   exists ti', SeqBB.step ge sp (Iexec ti) x (Iterm ti' cf)
+           /\ state_lessdef i' ti'.
+Proof.
+
+(*|
+Proof Sketch:
+
+We do an induction over the list of instructions ``x``.  This is trivial for the
+empty case and then for the inductive case we know that there exists an
+execution that matches the abstract execution, so we need to know that adding
+another instructions to it will still mean that the execution will result in the
+same value.
+
+Arithmetic operations will be a problem because we will have to show that these
+can be executed.  However, this should mostly be a problem in the abstract state
+comparison, because there two abstract states can be equal without one being
+evaluable.
+|*)
+
+Admitted.
+
+End CORRECTNESS.
-- 
cgit