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+(*
+ * Vericert: Verified high-level synthesis.
+ * Copyright (C) 2020-2022 Yann Herklotz <yann@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.Events.
+Require Import compcert.common.Globalenvs.
+Require Import compcert.common.Memory.
+Require Import compcert.common.Smallstep.
+Require Import compcert.common.Values.
+Require Import compcert.lib.Coqlib.
+Require Import compcert.lib.Integers.
+Require Import compcert.lib.Maps.
+Require Import compcert.verilog.Op.
+
+Require Import vericert.hls.Gible.
+
+(*|
+========
+RTLBlock
+========
+|*)
+
+Module BB <: BlockType.
+
+  Definition t := list instr.
+
+  Section RELSEM.
+
+    Context {A B: Type} (ge: Genv.t A B).
+
+(*|
+Instruction list step
+---------------------
+
+The ``step_instr_list`` definition describes the execution of a list of
+instructions in one big step, inductively traversing the list of instructions
+and applying the ``step_instr``.
+
+This is simply using the high-level function ``step_list``, which is a general
+function that can execute lists of things, given their execution rule.
+|*)
+
+    Definition step := step_list (step_instr ge).
+
+  End RELSEM.
+
+  Definition max_reg (m : positive) (n: node) (i : t) : positive :=
+    fold_left max_reg_instr i m.
+
+  Definition length : t -> nat := @length instr.
+
+End BB.
+
+Module GibleSeq := Gible(BB).