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;; Copyright (C) 2017, Regents of the University of Texas
;; Written by Cuong Chau
;; License: A 3-clause BSD license. See the LICENSE file distributed with
;; ACL2.
;; Cuong Chau <ckcuong@cs.utexas.edu>
;; May 2019
(in-package "ADE")
(include-book "../link-joint")
(include-book "../vector-module")
(local (in-theory (disable nth)))
;; ======================================================================
;;; Table of Contents:
;;;
;;; 1. DE Module Generator of ALT-BRANCH
;;; 2. Specify and Prove a State Invariant
;; ======================================================================
;; 1. DE Module Generator of ALT-BRANCH
;;
;; Construct a DE module generator for an alternate branch, ALT-BRANCH, using
;; the link-joint model. Prove the value and state lemmas for this module
;; generator.
(defconst *alt-branch$go-num* 2)
(defun alt-branch$data-ins-len (data-size)
(declare (xargs :guard (natp data-size)))
(+ 3 (mbe :logic (nfix data-size)
:exec data-size)))
(defun alt-branch$ins-len (data-size)
(declare (xargs :guard (natp data-size)))
(+ (alt-branch$data-ins-len data-size)
*alt-branch$go-num*))
;; DE module generator of ALT-BRANCH
(module-generator
alt-branch* (data-size)
(si 'alt-branch data-size)
(list* 'full-in 'empty-out0- 'empty-out1-
(append (sis 'data-in 0 data-size)
(sis 'go 0 *alt-branch$go-num*)))
(list* 'act 'act0 'act1
(sis 'data-out 0 data-size))
'(select select-buf)
(list
;; LINKS
;; Select
'(select (select-status select-out)
link1
(buf-act act select-in))
;; Select-buf
'(select-buf (select-buf-status select-buf-out)
link1
(act buf-act select-buf-in))
;; JOINTS
;; Alt-Branch
'(g0 (select-out~) b-not (select-out))
'(g1 (m-full-in) b-and (full-in select-status))
'(g2 (m-empty-out0-) b-or3 (empty-out0- select-buf-status select-out))
'(g3 (m-empty-out1-) b-or3 (empty-out1- select-buf-status select-out~))
(list 'alt-branch-cntl0
'(act0)
'joint-cntl
(list 'm-full-in 'm-empty-out0- (si 'go 0)))
(list 'alt-branch-cntl1
'(act1)
'joint-cntl
(list 'm-full-in 'm-empty-out1- (si 'go 0)))
'(alt-branch-cntl (act) b-or (act0 act1))
(list 'alt-branch-op0
(sis 'data-out 0 data-size)
(si 'v-buf data-size)
(sis 'data-in 0 data-size))
'(alt-branch-op1 (select-buf-in) b-not (select-out))
;; Buffer
(list 'buf-cntl
'(buf-act)
'joint-cntl
(list 'select-buf-status 'select-status (si 'go 1)))
'(buf-op (select-in) b-buf (select-buf-out)))
(declare (xargs :guard (natp data-size))))
(make-event
`(progn
,@(state-accessors-gen 'alt-branch '(select select-buf) 0)))
;; DE netlist generator. A generated netlist will contain an instance of
;; ALT-BRANCH.
(defund alt-branch$netlist (data-size)
(declare (xargs :guard (natp data-size)))
(cons (alt-branch* data-size)
(union$ (link1$netlist)
*joint-cntl*
(v-buf$netlist data-size)
:test 'equal)))
;; Recognizer for ALT-BRANCH
(defund alt-branch& (netlist data-size)
(declare (xargs :guard (and (alistp netlist)
(natp data-size))))
(b* ((subnetlist (delete-to-eq (si 'alt-branch data-size) netlist)))
(and (equal (assoc (si 'alt-branch data-size) netlist)
(alt-branch* data-size))
(link1& subnetlist)
(joint-cntl& subnetlist)
(v-buf& subnetlist data-size))))
;; Sanity check
(local
(defthmd check-alt-branch$netlist-64
(and (net-syntax-okp (alt-branch$netlist 64))
(net-arity-okp (alt-branch$netlist 64))
(alt-branch& (alt-branch$netlist 64) 64))))
;; Constraints on the state of ALT-BRANCH
(defund alt-branch$valid-st (st)
(b* ((select (nth *alt-branch$select* st))
(select-buf (nth *alt-branch$select-buf* st)))
(and (link1$valid-st select)
(link1$valid-st select-buf))))
;; Extract the input and output signals for ALT-BRANCH
(progn
;; Extract the input data
(defun alt-branch$data-in (inputs data-size)
(declare (xargs :guard (and (true-listp inputs)
(natp data-size))))
(take (mbe :logic (nfix data-size)
:exec data-size)
(nthcdr 3 inputs)))
(defthm len-alt-branch$data-in
(equal (len (alt-branch$data-in inputs data-size))
(nfix data-size)))
(in-theory (disable alt-branch$data-in))
;; Extract the "act0" signal
(defund alt-branch$act0 (inputs st data-size)
(b* ((full-in (nth 0 inputs))
(empty-out0- (nth 1 inputs))
(go-signals (nthcdr (alt-branch$data-ins-len data-size) inputs))
(go-alt-branch (nth 0 go-signals))
(select (nth *alt-branch$select* st))
(select.s (nth *link1$s* select))
(select.d (nth *link1$d* select))
(select-buf (nth *alt-branch$select-buf* st))
(select-buf.s (nth *link1$s* select-buf))
(m-full-in (f-and full-in (car select.s)))
(m-empty-out0- (f-or3 empty-out0- (car select-buf.s) (car select.d))))
(joint-act m-full-in m-empty-out0- go-alt-branch)))
(defthm alt-branch$act0-inactive
(implies (or (not (nth 0 inputs))
(equal (nth 1 inputs) t))
(not (alt-branch$act0 inputs st data-size)))
:hints (("Goal" :in-theory (enable f-or3 alt-branch$act0))))
;; Extract the "act1" signal
(defund alt-branch$act1 (inputs st data-size)
(b* ((full-in (nth 0 inputs))
(empty-out1- (nth 2 inputs))
(go-signals (nthcdr (alt-branch$data-ins-len data-size) inputs))
(go-alt-branch (nth 0 go-signals))
(select (nth *alt-branch$select* st))
(select.s (nth *link1$s* select))
(select.d (nth *link1$d* select))
(select-buf (nth *alt-branch$select-buf* st))
(select-buf.s (nth *link1$s* select-buf))
(m-full-in (f-and full-in (car select.s)))
(m-empty-out1- (f-or3 empty-out1-
(car select-buf.s)
(f-not (car select.d)))))
(joint-act m-full-in m-empty-out1- go-alt-branch)))
(defthm alt-branch$act1-inactive
(implies (or (not (nth 0 inputs))
(equal (nth 2 inputs) t))
(not (alt-branch$act1 inputs st data-size)))
:hints (("Goal" :in-theory (enable f-or3 alt-branch$act1))))
;; Extract the "act" signal
(defund alt-branch$act (inputs st data-size)
(f-or (alt-branch$act0 inputs st data-size)
(alt-branch$act1 inputs st data-size)))
(defthm alt-branch$act-inactive
(implies (or (not (nth 0 inputs))
(and (equal (nth 1 inputs) t)
(equal (nth 2 inputs) t)))
(not (alt-branch$act inputs st data-size)))
:hints (("Goal" :in-theory (enable alt-branch$act))))
)
;; The value lemma for ALT-BRANCH
(defthm alt-branch$value
(b* ((inputs (list* full-in empty-out0- empty-out1-
(append data-in go-signals))))
(implies (and (alt-branch& netlist data-size)
(true-listp data-in)
(equal (len data-in) data-size)
(true-listp go-signals)
(equal (len go-signals) *alt-branch$go-num*))
(equal (se (si 'alt-branch data-size) inputs st netlist)
(list* (alt-branch$act inputs st data-size)
(alt-branch$act0 inputs st data-size)
(alt-branch$act1 inputs st data-size)
(v-threefix data-in)))))
:hints (("Goal"
:do-not-induct t
:expand (:free (inputs data-size)
(se (si 'alt-branch data-size) inputs st netlist))
:in-theory (e/d (de-rules
alt-branch&
alt-branch*$destructure
alt-branch$act
alt-branch$act0
alt-branch$act1)
(de-module-disabled-rules)))))
;; This function specifies the next state of ALT-BRANCH.
(defun alt-branch$step (inputs st data-size)
(b* ((go-signals (nthcdr (alt-branch$data-ins-len data-size) inputs))
(go-buf (nth 1 go-signals))
(select (nth *alt-branch$select* st))
(select.s (nth *link1$s* select))
(select.d (nth *link1$d* select))
(select-buf (nth *alt-branch$select-buf* st))
(select-buf.s (nth *link1$s* select-buf))
(select-buf.d (nth *link1$d* select-buf))
(act (alt-branch$act inputs st data-size))
(buf-act (joint-act (car select-buf.s) (car select.s) go-buf))
(select-inputs (list buf-act act (car select-buf.d)))
(select-buf-inputs (list act buf-act (f-not (car select.d)))))
(list
;; Select
(link1$step select-inputs select)
;; Select-buf
(link1$step select-buf-inputs select-buf))))
;; The state lemma for ALT-BRANCH
(defthm alt-branch$state
(b* ((inputs (list* full-in empty-out0- empty-out1-
(append data-in go-signals))))
(implies (and (alt-branch& netlist data-size)
(equal (len data-in) data-size)
(true-listp go-signals)
(equal (len go-signals) *alt-branch$go-num*))
(equal (de (si 'alt-branch data-size) inputs st netlist)
(alt-branch$step inputs st data-size))))
:hints (("Goal"
:do-not-induct t
:expand (:free (inputs data-size)
(de (si 'alt-branch data-size) inputs st netlist))
:in-theory (e/d (de-rules
alt-branch&
alt-branch*$destructure
alt-branch$act
alt-branch$act0
alt-branch$act1)
(de-module-disabled-rules)))))
(in-theory (disable alt-branch$step))
;; ======================================================================
;; 2. Specify and Prove a State Invariant
;; Conditions on the inputs
(defund alt-branch$input-format (inputs data-size)
(declare (xargs :guard (and (true-listp inputs)
(natp data-size))))
(b* ((full-in (nth 0 inputs))
(empty-out0- (nth 1 inputs))
(empty-out1- (nth 2 inputs))
(data-in (alt-branch$data-in inputs data-size))
(go-signals (nthcdr (alt-branch$data-ins-len data-size) inputs)))
(and
(booleanp full-in)
(booleanp empty-out0-)
(booleanp empty-out1-)
(or (not full-in) (bvp data-in))
(true-listp go-signals)
(= (len go-signals) *alt-branch$go-num*)
(equal inputs
(list* full-in empty-out0- empty-out1-
(append data-in go-signals))))))
(defthm booleanp-alt-branch$act0
(implies (and (alt-branch$input-format inputs data-size)
(alt-branch$valid-st st))
(booleanp (alt-branch$act0 inputs st data-size)))
:hints (("Goal" :in-theory (enable alt-branch$input-format
alt-branch$valid-st
alt-branch$act0)))
:rule-classes (:rewrite :type-prescription))
(defthm booleanp-alt-branch$act1
(implies (and (alt-branch$input-format inputs data-size)
(alt-branch$valid-st st))
(booleanp (alt-branch$act1 inputs st data-size)))
:hints (("Goal" :in-theory (enable alt-branch$input-format
alt-branch$valid-st
alt-branch$act1)))
:rule-classes (:rewrite :type-prescription))
(defthm booleanp-alt-branch$act
(implies (and (alt-branch$input-format inputs data-size)
(alt-branch$valid-st st))
(booleanp (alt-branch$act inputs st data-size)))
:hints (("Goal" :in-theory (enable alt-branch$act)))
:rule-classes (:rewrite :type-prescription))
(defthm alt-branch$valid-st-preserved
(implies (and (alt-branch$input-format inputs data-size)
(alt-branch$valid-st st))
(alt-branch$valid-st
(alt-branch$step inputs st data-size)))
:hints (("Goal"
:in-theory (e/d (f-sr
alt-branch$input-format
alt-branch$valid-st
alt-branch$step
alt-branch$act
alt-branch$act0
alt-branch$act1)
()))))
;; A state invariant
(defund alt-branch$inv (st)
(b* ((select (nth *alt-branch$select* st))
(select.s (nth *link1$s* select))
(select-buf (nth *alt-branch$select-buf* st))
(select-buf.s (nth *link1$s* select-buf)))
(not (equal select.s select-buf.s))))
(defthm alt-branch$inv-preserved
(implies (and (alt-branch$input-format inputs data-size)
(alt-branch$valid-st st)
(alt-branch$inv st))
(alt-branch$inv (alt-branch$step inputs st data-size)))
:hints (("Goal"
:in-theory (e/d (f-sr
alt-branch$input-format
alt-branch$valid-st
alt-branch$inv
alt-branch$step
alt-branch$act
alt-branch$act0
alt-branch$act1)
()))))
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