903 lines
43 KiB
C++
903 lines
43 KiB
C++
// -*- mode: C++; c-file-style: "cc-mode" -*-
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//*************************************************************************
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// DESCRIPTION: Verilator: Add temporaries, such as for expand nodes
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//
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// Code available from: https://verilator.org
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//
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//*************************************************************************
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//
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// Copyright 2004-2022 by Wilson Snyder. This program is free software; you
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// can redistribute it and/or modify it under the terms of either the GNU
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// Lesser General Public License Version 3 or the Perl Artistic License
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// Version 2.0.
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// SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
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//
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//*************************************************************************
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// V3Expand's Transformations:
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//
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// Each module:
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// Expand verilated.h macros into internal micro optimizations (RTL)
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// this will enable later optimizations.
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// Wide operands become assignments to each word of the vector, (WORDSELs)
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// Note in this case that the widthMin is not correct for the MSW of
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// the vector. This must be accounted for if doing later constant
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// propagation across signals.
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//
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//*************************************************************************
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#include "config_build.h"
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#include "verilatedos.h"
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#include "V3Expand.h"
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#include "V3Ast.h"
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#include "V3Const.h"
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#include "V3Global.h"
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#include "V3Stats.h"
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#include <algorithm>
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//######################################################################
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// Expand state, as a visitor of each AstNode
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class ExpandVisitor final : public VNVisitor {
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private:
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// NODE STATE
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// AstNode::user1() -> bool. Processed
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const VNUser1InUse m_inuser1;
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// STATE
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AstNode* m_stmtp = nullptr; // Current statement
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VDouble0 m_statWides; // Statistic tracking
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VDouble0 m_statWideWords; // Statistic tracking
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VDouble0 m_statWideLimited; // Statistic tracking
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// METHODS
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VL_DEBUG_FUNC; // Declare debug()
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bool doExpand(AstNode* nodep) {
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++m_statWides;
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if (nodep->widthWords() <= v3Global.opt.expandLimit()) {
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m_statWideWords += nodep->widthWords();
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return true;
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} else {
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++m_statWideLimited;
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return false;
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}
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}
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static int longOrQuadWidth(AstNode* nodep) {
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return (nodep->width() + (VL_EDATASIZE - 1)) & ~(VL_EDATASIZE - 1);
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}
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static V3Number notWideMask(AstNode* nodep) {
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return V3Number(nodep, VL_EDATASIZE, ~VL_MASK_E(nodep->widthMin()));
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}
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static V3Number wordMask(AstNode* nodep) {
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if (nodep->isWide()) {
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return V3Number{nodep, VL_EDATASIZE, VL_MASK_E(nodep->widthMin())};
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} else {
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V3Number mask{nodep, longOrQuadWidth(nodep)};
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mask.setMask(nodep->widthMin());
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return mask;
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}
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}
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static void insertBefore(AstNode* placep, AstNode* newp) {
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newp->user1(1); // Already processed, don't need to re-iterate
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placep->addHereThisAsNext(newp);
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}
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static void replaceWithDelete(AstNode* nodep, AstNode* newp) {
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newp->user1(1); // Already processed, don't need to re-iterate
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nodep->replaceWith(newp);
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VL_DO_DANGLING(nodep->deleteTree(), nodep);
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}
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static AstNode* newWordAssign(AstNodeAssign* placep, int word, AstNode* lhsp, AstNode* rhsp) {
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FileLine* const fl = placep->fileline();
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return new AstAssign{fl,
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new AstWordSel{fl, lhsp->cloneTree(true),
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new AstConst{fl, static_cast<uint32_t>(word)}},
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rhsp};
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}
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static void addWordAssign(AstNodeAssign* placep, int word, AstNode* lhsp, AstNode* rhsp) {
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insertBefore(placep, newWordAssign(placep, word, lhsp, rhsp));
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}
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static void addWordAssign(AstNodeAssign* placep, int word, AstNode* rhsp) {
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addWordAssign(placep, word, placep->lhsp(), rhsp);
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}
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static void fixCloneLvalue(AstNode* nodep) {
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// In AstSel transforms, we call clone() on VarRefs that were lvalues,
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// but are now being used on the RHS of the assignment
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if (VN_IS(nodep, VarRef)) VN_AS(nodep, VarRef)->access(VAccess::READ);
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// Iterate
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if (nodep->op1p()) fixCloneLvalue(nodep->op1p());
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if (nodep->op2p()) fixCloneLvalue(nodep->op2p());
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if (nodep->op3p()) fixCloneLvalue(nodep->op3p());
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if (nodep->op4p()) fixCloneLvalue(nodep->op4p());
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}
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static AstNode* newAstWordSelClone(AstNode* nodep, int word) {
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// Get the specified word number from a wide array
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// Or, if it's a long/quad, do appropriate conversion to wide
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// Concat may pass negative word numbers, that means it wants a zero
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FileLine* const fl = nodep->fileline();
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if (nodep->isWide() && word >= 0 && word < nodep->widthWords()) {
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return new AstWordSel{fl, nodep->cloneTree(true),
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new AstConst{fl, static_cast<uint32_t>(word)}};
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} else if (nodep->isQuad() && word == 0) {
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AstNode* const quadfromp = nodep->cloneTree(true);
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quadfromp->dtypeSetBitUnsized(VL_QUADSIZE, quadfromp->widthMin(), VSigning::UNSIGNED);
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return new AstCCast{fl, quadfromp, VL_EDATASIZE};
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} else if (nodep->isQuad() && word == 1) {
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AstNode* const quadfromp = nodep->cloneTree(true);
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quadfromp->dtypeSetBitUnsized(VL_QUADSIZE, quadfromp->widthMin(), VSigning::UNSIGNED);
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return new AstCCast{
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fl, new AstShiftR{fl, quadfromp, new AstConst{fl, VL_EDATASIZE}, VL_EDATASIZE},
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VL_EDATASIZE};
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} else if (!nodep->isWide() && !nodep->isQuad() && word == 0) {
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return nodep->cloneTree(true);
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} else { // Out of bounds
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return new AstConst{fl, 0};
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}
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}
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static AstNode* newWordGrabShift(FileLine* fl, int word, AstNode* lhsp, int shift) {
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// Extract the expression to grab the value for the specified word, if it's the shift
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// of shift bits from lhsp
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AstNode* newp;
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// Negative word numbers requested for lhs when it's "before" what we want.
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// We get a 0 then.
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const int othword = word - shift / VL_EDATASIZE;
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AstNode* const llowp = newAstWordSelClone(lhsp, othword);
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if (const int loffset = VL_BITBIT_E(shift)) {
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AstNode* const lhip = newAstWordSelClone(lhsp, othword - 1);
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const int nbitsonright = VL_EDATASIZE - loffset; // bits that end up in lword
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newp = new AstOr{
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fl,
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new AstAnd{fl, new AstConst{fl, AstConst::SizedEData(), VL_MASK_E(loffset)},
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new AstShiftR{fl, lhip,
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new AstConst{fl, static_cast<uint32_t>(nbitsonright)},
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VL_EDATASIZE}},
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new AstAnd{fl, new AstConst{fl, AstConst::SizedEData(), ~VL_MASK_E(loffset)},
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new AstShiftL{fl, llowp,
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new AstConst{fl, static_cast<uint32_t>(loffset)},
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VL_EDATASIZE}}};
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newp = V3Const::constifyEditCpp(newp);
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} else {
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newp = llowp;
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}
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return newp;
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}
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static AstNode* newWordSel(FileLine* fl, AstNode* fromp, AstNode* lsbp,
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uint32_t wordOffset = 0) {
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// Return equation to get the VL_BITWORD of a constant or non-constant
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UASSERT_OBJ(fromp->isWide(), fromp, "Only need AstWordSel on wide from's");
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if (wordOffset >= static_cast<uint32_t>(fromp->widthWords())) {
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// e.g. "logic [95:0] var[0]; logic [0] sel; out = var[sel];"
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// Squash before C++ to avoid getting a C++ compiler warning
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// (even though code would be unreachable as presumably a
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// AstCondBound is protecting above this node.
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return new AstConst{fl, AstConst::SizedEData(), 0};
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} else {
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AstNode* wordp;
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FileLine* const lfl = lsbp->fileline();
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if (VN_IS(lsbp, Const)) {
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wordp = new AstConst{lfl, wordOffset + VL_BITWORD_E(VN_AS(lsbp, Const)->toUInt())};
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} else {
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wordp = new AstShiftR{lfl, lsbp->cloneTree(true),
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new AstConst{lfl, VL_EDATASIZE_LOG2}, VL_EDATASIZE};
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if (wordOffset
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!= 0) { // This is indexing a arraysel, so a 32 bit constant is fine
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wordp = new AstAdd{lfl, new AstConst{lfl, wordOffset}, wordp};
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}
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}
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return new AstWordSel{fl, fromp, wordp};
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}
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}
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static AstNode* dropCondBound(AstNode* nodep) {
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// Experimental only...
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// If there's a CONDBOUND safety to keep arrays in bounds,
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// we're going to AND it to a value that always fits inside a
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// word, so we don't need it.
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// if (VN_IS(nodep, CondBound) && VN_IS(VN_AS(nodep, CondBound)->lhsp(), Lte)) {
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// nodep = VN_AS(nodep, CondBound)->rhsp();
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//}
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return nodep;
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}
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static AstNode* newSelBitBit(AstNode* lsbp) {
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// Return equation to get the VL_BITBIT of a constant or non-constant
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FileLine* const fl = lsbp->fileline();
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if (VN_IS(lsbp, Const)) {
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return new AstConst{fl, VL_BITBIT_E(VN_AS(lsbp, Const)->toUInt())};
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} else {
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return new AstAnd{fl, new AstConst{fl, VL_EDATASIZE - 1},
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dropCondBound(lsbp)->cloneTree(true)};
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}
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}
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//====================
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bool expandWide(AstNodeAssign* nodep, AstConst* rhsp) {
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UINFO(8, " Wordize ASSIGN(CONST) " << nodep << endl);
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if (!doExpand(nodep)) return false;
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// -> {for each_word{ ASSIGN(WORDSEL(wide,#),WORDSEL(CONST,#))}}
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if (rhsp->num().isFourState()) {
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rhsp->v3warn(E_UNSUPPORTED, // LCOV_EXCL_LINE // impossible?
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"Unsupported: 4-state numbers in this context");
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}
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FileLine* const fl = nodep->fileline();
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for (int w = 0; w < nodep->widthWords(); ++w) {
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addWordAssign(nodep, w,
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new AstConst{fl, AstConst::SizedEData(), rhsp->num().edataWord(w)});
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}
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return true;
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}
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//-------- Uniops
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bool expandWide(AstNodeAssign* nodep, AstVarRef* rhsp) {
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UINFO(8, " Wordize ASSIGN(VARREF) " << nodep << endl);
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if (!doExpand(nodep)) return false;
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for (int w = 0; w < nodep->widthWords(); ++w) {
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addWordAssign(nodep, w, newAstWordSelClone(rhsp, w));
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}
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return true;
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}
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bool expandWide(AstNodeAssign* nodep, AstArraySel* rhsp) {
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UINFO(8, " Wordize ASSIGN(ARRAYSEL) " << nodep << endl);
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UASSERT_OBJ(!VN_IS(nodep->dtypep()->skipRefp(), UnpackArrayDType), nodep,
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"ArraySel with unpacked arrays should have been removed in V3Slice");
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if (!doExpand(nodep)) return false;
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for (int w = 0; w < nodep->widthWords(); ++w) {
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addWordAssign(nodep, w, newAstWordSelClone(rhsp, w));
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}
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return true;
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}
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bool expandWide(AstNodeAssign* nodep, AstNot* rhsp) {
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UINFO(8, " Wordize ASSIGN(NOT) " << nodep << endl);
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// -> {for each_word{ ASSIGN(WORDSEL(wide,#),NOT(WORDSEL(lhs,#))) }}
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if (!doExpand(nodep)) return false;
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FileLine* const fl = rhsp->fileline();
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for (int w = 0; w < nodep->widthWords(); ++w) {
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addWordAssign(nodep, w, new AstNot{fl, newAstWordSelClone(rhsp->lhsp(), w)});
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}
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return true;
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}
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//-------- Biops
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bool expandWide(AstNodeAssign* nodep, AstAnd* rhsp) {
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UINFO(8, " Wordize ASSIGN(AND) " << nodep << endl);
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if (!doExpand(nodep)) return false;
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FileLine* const fl = nodep->fileline();
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for (int w = 0; w < nodep->widthWords(); ++w) {
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addWordAssign(nodep, w,
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new AstAnd{fl, newAstWordSelClone(rhsp->lhsp(), w),
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newAstWordSelClone(rhsp->rhsp(), w)});
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}
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return true;
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}
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bool expandWide(AstNodeAssign* nodep, AstOr* rhsp) {
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UINFO(8, " Wordize ASSIGN(OR) " << nodep << endl);
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if (!doExpand(nodep)) return false;
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FileLine* const fl = nodep->fileline();
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for (int w = 0; w < nodep->widthWords(); ++w) {
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addWordAssign(nodep, w,
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new AstOr{fl, newAstWordSelClone(rhsp->lhsp(), w),
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newAstWordSelClone(rhsp->rhsp(), w)});
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}
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return true;
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}
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bool expandWide(AstNodeAssign* nodep, AstXor* rhsp) {
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UINFO(8, " Wordize ASSIGN(XOR) " << nodep << endl);
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if (!doExpand(nodep)) return false;
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FileLine* const fl = nodep->fileline();
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for (int w = 0; w < nodep->widthWords(); ++w) {
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addWordAssign(nodep, w,
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new AstXor{fl, newAstWordSelClone(rhsp->lhsp(), w),
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newAstWordSelClone(rhsp->rhsp(), w)});
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}
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return true;
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}
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//-------- Triops
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bool expandWide(AstNodeAssign* nodep, AstNodeCond* rhsp) {
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UINFO(8, " Wordize ASSIGN(COND) " << nodep << endl);
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if (!doExpand(nodep)) return false;
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FileLine* const fl = nodep->fileline();
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for (int w = 0; w < nodep->widthWords(); ++w) {
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addWordAssign(nodep, w,
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new AstCond{fl, rhsp->condp()->cloneTree(true),
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newAstWordSelClone(rhsp->expr1p(), w),
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newAstWordSelClone(rhsp->expr2p(), w)});
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}
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return true;
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}
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// VISITORS
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virtual void visit(AstExtend* nodep) override {
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if (nodep->user1SetOnce()) return; // Process once
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iterateChildren(nodep);
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if (nodep->isWide()) {
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// See under ASSIGN(EXTEND)
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} else {
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AstNode* const lhsp = nodep->lhsp()->unlinkFrBack();
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AstNode* newp = lhsp;
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if (nodep->isQuad()) {
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if (lhsp->isQuad()) {
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lhsp->dtypeFrom(nodep); // Just mark it, else nop
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} else if (lhsp->isWide()) {
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nodep->v3fatalSrc("extending larger thing into smaller?");
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} else {
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UINFO(8, " EXTEND(q<-l) " << nodep << endl);
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newp = new AstCCast{nodep->fileline(), lhsp, nodep};
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}
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} else { // Long
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UASSERT_OBJ(!(lhsp->isQuad() || lhsp->isWide()), nodep,
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"extending larger thing into smaller?");
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lhsp->dtypeFrom(nodep); // Just mark it, else nop
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}
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VL_DO_DANGLING(replaceWithDelete(nodep, newp), nodep);
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}
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}
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virtual void visit(AstSel* nodep) override {
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if (nodep->user1SetOnce()) return; // Process once
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iterateChildren(nodep);
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// Remember, Sel's may have non-integer rhs, so need to optimize for that!
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UASSERT_OBJ(nodep->widthMin() == nodep->widthConst(), nodep, "Width mismatch");
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if (VN_IS(nodep->backp(), NodeAssign)
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&& nodep == VN_AS(nodep->backp(), NodeAssign)->lhsp()) {
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// Sel is an LHS assignment select
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} else if (nodep->isWide()) {
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// See under ASSIGN(WIDE)
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} else if (nodep->fromp()->isWide()) {
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UINFO(8, " SEL(wide) " << nodep << endl);
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UASSERT_OBJ(nodep->widthConst() <= 64, nodep, "Inconsistent width");
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// Selection amounts
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// Check for constant shifts & save some constification work later.
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// Grab lowest bit(s)
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FileLine* const nfl = nodep->fileline();
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FileLine* const lfl = nodep->lsbp()->fileline();
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FileLine* const ffl = nodep->fromp()->fileline();
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AstNode* lowwordp = newWordSel(ffl, nodep->fromp()->cloneTree(true), nodep->lsbp());
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if (nodep->isQuad() && !lowwordp->isQuad()) {
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lowwordp = new AstCCast{nfl, lowwordp, nodep};
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}
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AstNode* const lowp
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= new AstShiftR{nfl, lowwordp, newSelBitBit(nodep->lsbp()), nodep->width()};
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// If > 1 bit, we might be crossing the word boundary
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AstNode* midp = nullptr;
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if (nodep->widthConst() > 1) {
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const uint32_t midMsbOffset
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= std::min<uint32_t>(nodep->widthConst(), VL_EDATASIZE) - 1;
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AstNode* const midMsbp = new AstAdd{lfl, new AstConst{lfl, midMsbOffset},
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nodep->lsbp()->cloneTree(false)};
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AstNode* midwordp = // SEL(from,[midwordnum])
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newWordSel(ffl, nodep->fromp()->cloneTree(true), midMsbp, 0);
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// newWordSel clones the index, so delete it
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VL_DO_DANGLING(midMsbp->deleteTree(), midMsbp);
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if (nodep->isQuad() && !midwordp->isQuad()) {
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midwordp = new AstCCast{nfl, midwordp, nodep};
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}
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AstNode* const midshiftp = new AstSub{lfl, new AstConst{lfl, VL_EDATASIZE},
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newSelBitBit(nodep->lsbp())};
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// If we're selecting bit zero, then all 32 bits in the mid word
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// get shifted << by 32 bits, so ignore them.
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const V3Number zero{nodep, longOrQuadWidth(nodep)};
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midp = new AstCond{
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nfl,
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// lsb % VL_EDATASIZE == 0 ?
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new AstEq{nfl, new AstConst{nfl, 0}, newSelBitBit(nodep->lsbp())},
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// 0 :
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new AstConst{nfl, zero},
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// midword >> (VL_EDATASIZE - (lbs % VL_EDATASIZE))
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new AstShiftL{nfl, midwordp, midshiftp, nodep->width()}};
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}
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// If > 32 bits, we might be crossing the second word boundary
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AstNode* hip = nullptr;
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if (nodep->widthConst() > VL_EDATASIZE) {
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const uint32_t hiMsbOffset = nodep->widthConst() - 1;
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AstNode* const hiMsbp = new AstAdd{lfl, new AstConst{lfl, hiMsbOffset},
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nodep->lsbp()->cloneTree(false)};
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AstNode* hiwordp = // SEL(from,[hiwordnum])
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newWordSel(ffl, nodep->fromp()->cloneTree(true), hiMsbp);
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// newWordSel clones the index, so delete it
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VL_DO_DANGLING(hiMsbp->deleteTree(), hiMsbp);
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if (nodep->isQuad() && !hiwordp->isQuad()) {
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hiwordp = new AstCCast{nfl, hiwordp, nodep};
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}
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AstNode* const hishiftp = new AstCond{
|
|
nfl,
|
|
// lsb % VL_EDATASIZE == 0 ?
|
|
new AstEq{nfl, new AstConst{nfl, 0}, newSelBitBit(nodep->lsbp())},
|
|
// VL_EDATASIZE :
|
|
new AstConst{lfl, VL_EDATASIZE},
|
|
// 64 - (lbs % VL_EDATASIZE)
|
|
new AstSub{lfl, new AstConst{lfl, 64}, newSelBitBit(nodep->lsbp())}};
|
|
hip = new AstShiftL{nfl, hiwordp, hishiftp, nodep->width()};
|
|
}
|
|
|
|
AstNode* newp = lowp;
|
|
if (midp) newp = new AstOr{nfl, midp, newp};
|
|
if (hip) newp = new AstOr{nfl, hip, newp};
|
|
newp->dtypeFrom(nodep);
|
|
VL_DO_DANGLING(replaceWithDelete(nodep, newp), nodep);
|
|
} else { // Long/Quad from Long/Quad
|
|
UINFO(8, " SEL->SHIFT " << nodep << endl);
|
|
FileLine* const fl = nodep->fileline();
|
|
AstNode* fromp = nodep->fromp()->unlinkFrBack();
|
|
AstNode* const lsbp = nodep->lsbp()->unlinkFrBack();
|
|
if (nodep->isQuad() && !fromp->isQuad()) { fromp = new AstCCast{fl, fromp, nodep}; }
|
|
// {large}>>32 requires 64-bit shift operation; then cast
|
|
AstNode* newp = new AstShiftR{fl, fromp, dropCondBound(lsbp), fromp->width()};
|
|
newp->dtypeFrom(fromp);
|
|
if (!nodep->isQuad() && fromp->isQuad()) { newp = new AstCCast{fl, newp, nodep}; }
|
|
newp->dtypeFrom(nodep);
|
|
VL_DO_DANGLING(replaceWithDelete(nodep, newp), nodep);
|
|
}
|
|
}
|
|
|
|
bool expandWide(AstNodeAssign* nodep, AstSel* rhsp) {
|
|
UASSERT_OBJ(nodep->widthMin() == rhsp->widthConst(), nodep, "Width mismatch");
|
|
if (!doExpand(nodep)) return false;
|
|
if (VN_IS(rhsp->lsbp(), Const) && VL_BITBIT_E(rhsp->lsbConst()) == 0) {
|
|
const int lsb = rhsp->lsbConst();
|
|
UINFO(8, " Wordize ASSIGN(SEL,align) " << nodep << endl);
|
|
for (int w = 0; w < nodep->widthWords(); ++w) {
|
|
addWordAssign(nodep, w, newAstWordSelClone(rhsp->fromp(), w + VL_BITWORD_E(lsb)));
|
|
}
|
|
return true;
|
|
} else {
|
|
UINFO(8, " Wordize ASSIGN(EXTRACT,misalign) " << nodep << endl);
|
|
FileLine* const nfl = nodep->fileline();
|
|
FileLine* const rfl = rhsp->fileline();
|
|
FileLine* const ffl = rhsp->fromp()->fileline();
|
|
FileLine* const lfl = rhsp->lsbp()->fileline();
|
|
for (int w = 0; w < nodep->widthWords(); ++w) {
|
|
// Grab lowest bits
|
|
AstNode* const lowwordp
|
|
= newWordSel(rfl, rhsp->fromp()->cloneTree(true), rhsp->lsbp(), w);
|
|
AstNode* const lowp
|
|
= new AstShiftR{rfl, lowwordp, newSelBitBit(rhsp->lsbp()), VL_EDATASIZE};
|
|
// Upper bits
|
|
const V3Number zero{nodep, VL_EDATASIZE, 0};
|
|
AstNode* const midwordp = // SEL(from,[1+wordnum])
|
|
newWordSel(ffl, rhsp->fromp()->cloneTree(true), rhsp->lsbp(), w + 1);
|
|
AstNode* const midshiftp
|
|
= new AstSub{lfl, new AstConst{lfl, VL_EDATASIZE}, newSelBitBit(rhsp->lsbp())};
|
|
AstNode* const midmayp = new AstShiftL{rfl, midwordp, midshiftp, VL_EDATASIZE};
|
|
AstNode* const midp = new AstCond{
|
|
rfl, new AstEq{rfl, new AstConst{rfl, 0}, newSelBitBit(rhsp->lsbp())},
|
|
new AstConst{rfl, zero}, midmayp};
|
|
AstNode* const newp = new AstOr{nfl, midp, lowp};
|
|
addWordAssign(nodep, w, newp);
|
|
}
|
|
return true;
|
|
}
|
|
}
|
|
|
|
bool expandLhs(AstNodeAssign* nodep, AstSel* lhsp) {
|
|
// Possibilities
|
|
// destp: wide or narrow
|
|
// rhsp: wide (destp must be wide), narrow, or 1 bit wide
|
|
// rhsp: may be allones and can remove AND NOT gate
|
|
// lsbp: constant or variable
|
|
// Yuk.
|
|
FileLine* const nfl = nodep->fileline();
|
|
FileLine* const lfl = lhsp->fileline();
|
|
const bool destwide = lhsp->fromp()->isWide();
|
|
const bool ones = nodep->rhsp()->isAllOnesV();
|
|
if (VN_IS(lhsp->lsbp(), Const)) {
|
|
// The code should work without this constant test, but it won't
|
|
// constify as nicely as we'd like.
|
|
AstNode* rhsp = nodep->rhsp()->unlinkFrBack();
|
|
AstNode* const destp = lhsp->fromp()->unlinkFrBack();
|
|
const int lsb = lhsp->lsbConst();
|
|
const int msb = lhsp->msbConst();
|
|
V3Number maskset{nodep, destp->widthMin()};
|
|
for (int bit = lsb; bit < (msb + 1); bit++) maskset.setBit(bit, 1);
|
|
V3Number maskold{nodep, destp->widthMin()};
|
|
maskold.opNot(maskset);
|
|
if (destwide) {
|
|
UINFO(8, " ASSIGNSEL(const,wide) " << nodep << endl);
|
|
for (int w = 0; w < destp->widthWords(); ++w) {
|
|
if (w >= VL_BITWORD_E(lsb) && w <= VL_BITWORD_E(msb)) {
|
|
// else we would just be setting it to the same exact value
|
|
AstNode* oldvalp = newAstWordSelClone(destp, w);
|
|
fixCloneLvalue(oldvalp);
|
|
if (!ones) {
|
|
oldvalp = new AstAnd{
|
|
lfl,
|
|
new AstConst{lfl, AstConst::SizedEData(), maskold.edataWord(w)},
|
|
oldvalp};
|
|
}
|
|
|
|
// Appropriate word of new value to insert:
|
|
AstNode* newp = newWordGrabShift(lfl, w, rhsp, lsb);
|
|
|
|
// Apply cleaning at the top word of the destination
|
|
// (no cleaning to do if dst's width is a whole number
|
|
// of words).
|
|
if (w == destp->widthWords() - 1 && VL_BITBIT_E(destp->widthMin()) != 0) {
|
|
V3Number cleanmask{nodep, VL_EDATASIZE};
|
|
cleanmask.setMask(VL_BITBIT_E(destp->widthMin()));
|
|
newp = new AstAnd{lfl, newp, new AstConst{lfl, cleanmask}};
|
|
}
|
|
AstNode* const orp
|
|
= V3Const::constifyEditCpp(new AstOr{lfl, oldvalp, newp});
|
|
addWordAssign(nodep, w, destp, orp);
|
|
}
|
|
}
|
|
VL_DO_DANGLING(rhsp->deleteTree(), rhsp);
|
|
VL_DO_DANGLING(destp->deleteTree(), destp);
|
|
} else {
|
|
UINFO(8, " ASSIGNSEL(const,narrow) " << nodep << endl);
|
|
if (destp->isQuad() && !rhsp->isQuad()) { rhsp = new AstCCast{nfl, rhsp, nodep}; }
|
|
AstNode* oldvalp = destp->cloneTree(true);
|
|
fixCloneLvalue(oldvalp);
|
|
if (!ones) { oldvalp = new AstAnd{lfl, new AstConst{lfl, maskold}, oldvalp}; }
|
|
|
|
// The bit-select can refer to bits outside the width of nodep
|
|
// which we aren't allowed to assign to. This is a mask of the
|
|
// valid range of nodep which we apply to the new shifted RHS.
|
|
V3Number cleanmask{nodep, destp->widthMin()};
|
|
cleanmask.setMask(destp->widthMin());
|
|
AstNode* const shifted = new AstShiftL{
|
|
lfl, rhsp, new AstConst{lfl, static_cast<uint32_t>(lsb)}, destp->width()};
|
|
AstNode* const cleaned = new AstAnd{lfl, shifted, new AstConst{lfl, cleanmask}};
|
|
AstNode* const orp = V3Const::constifyEditCpp(new AstOr{lfl, oldvalp, cleaned});
|
|
AstNode* newp = new AstAssign{nfl, destp, orp};
|
|
insertBefore(nodep, newp);
|
|
}
|
|
return true;
|
|
} else { // non-const select offset
|
|
if (destwide && lhsp->widthConst() == 1) {
|
|
UINFO(8, " ASSIGNSEL(varlsb,wide,1bit) " << nodep << endl);
|
|
AstNode* const rhsp = nodep->rhsp()->unlinkFrBack();
|
|
AstNode* const destp = lhsp->fromp()->unlinkFrBack();
|
|
AstNode* oldvalp = newWordSel(lfl, destp->cloneTree(true), lhsp->lsbp());
|
|
fixCloneLvalue(oldvalp);
|
|
if (!ones) {
|
|
oldvalp = new AstAnd{
|
|
lfl,
|
|
new AstNot{
|
|
lfl, new AstShiftL{lfl, new AstConst{nfl, 1},
|
|
// newSelBitBit may exceed the MSB of this variable.
|
|
// That's ok as we'd just AND with a larger value,
|
|
// but oldval would clip the upper bits to sanity
|
|
newSelBitBit(lhsp->lsbp()), VL_EDATASIZE}},
|
|
oldvalp};
|
|
}
|
|
// Restrict the shift amount to 0-31, see bug804.
|
|
AstNode* const shiftp = new AstAnd{nfl, lhsp->lsbp()->cloneTree(true),
|
|
new AstConst{nfl, VL_EDATASIZE - 1}};
|
|
AstNode* const newp = new AstAssign{
|
|
nfl, newWordSel(nfl, destp, lhsp->lsbp()),
|
|
new AstOr{lfl, oldvalp, new AstShiftL{lfl, rhsp, shiftp, VL_EDATASIZE}}};
|
|
insertBefore(nodep, newp);
|
|
return true;
|
|
} else if (destwide) {
|
|
UINFO(8, " ASSIGNSEL(varlsb,wide) -- NoOp -- " << nodep << endl);
|
|
// For wide destp, we can either form a equation for every destination word,
|
|
// with the appropriate long equation of if it's being written or not.
|
|
// Or, we can use a LHS variable arraysel with
|
|
// non-constant index to set the vector.
|
|
// Doing the variable arraysel is better for globals and large arrays,
|
|
// doing every word is better for temporaries and if we're setting most words
|
|
// since it may result in better substitution optimizations later.
|
|
// This results in so much code, we're better off leaving a function call.
|
|
// Reconsider if we get subexpression elimination.
|
|
return false;
|
|
} else {
|
|
UINFO(8, " ASSIGNSEL(varlsb,narrow) " << nodep << endl);
|
|
// nodep->dumpTree(cout, "- old: ");
|
|
AstNode* rhsp = nodep->rhsp()->unlinkFrBack();
|
|
AstNode* const destp = lhsp->fromp()->unlinkFrBack();
|
|
AstNode* oldvalp = destp->cloneTree(true);
|
|
fixCloneLvalue(oldvalp);
|
|
|
|
V3Number maskwidth{nodep, destp->widthMin()};
|
|
for (int bit = 0; bit < lhsp->widthConst(); bit++) maskwidth.setBit(bit, 1);
|
|
|
|
if (destp->isQuad() && !rhsp->isQuad()) { rhsp = new AstCCast{nfl, rhsp, nodep}; }
|
|
if (!ones) {
|
|
oldvalp = new AstAnd{
|
|
lfl,
|
|
new AstNot{lfl,
|
|
new AstShiftL{lfl, new AstConst{nfl, maskwidth},
|
|
lhsp->lsbp()->cloneTree(true), destp->width()}},
|
|
oldvalp};
|
|
}
|
|
AstNode* newp
|
|
= new AstShiftL{lfl, rhsp, lhsp->lsbp()->cloneTree(true), destp->width()};
|
|
// Apply cleaning to the new value being inserted. Mask is
|
|
// slightly wider than necessary to avoid an AND with all ones
|
|
// being optimized out. No need to clean if destp is
|
|
// quad-sized as there are no extra bits to contaminate
|
|
if (destp->widthMin() != 64) {
|
|
V3Number cleanmask{nodep, destp->widthMin() + 1};
|
|
cleanmask.setMask(destp->widthMin());
|
|
newp = new AstAnd{lfl, newp, new AstConst{lfl, cleanmask}};
|
|
}
|
|
|
|
newp = new AstAssign{nfl, destp, new AstOr{lfl, oldvalp, newp}};
|
|
// newp->dumpTree(cout, "- new: ");
|
|
insertBefore(nodep, newp);
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
|
|
virtual void visit(AstConcat* nodep) override {
|
|
if (nodep->user1SetOnce()) return; // Process once
|
|
iterateChildren(nodep);
|
|
if (nodep->isWide()) {
|
|
// See under ASSIGN(WIDE)
|
|
} else {
|
|
UINFO(8, " CONCAT " << nodep << endl);
|
|
FileLine* const fl = nodep->fileline();
|
|
AstNode* lhsp = nodep->lhsp()->unlinkFrBack();
|
|
AstNode* rhsp = nodep->rhsp()->unlinkFrBack();
|
|
const uint32_t rhsshift = rhsp->widthMin();
|
|
if (nodep->isQuad() && !lhsp->isQuad()) { lhsp = new AstCCast{fl, lhsp, nodep}; }
|
|
if (nodep->isQuad() && !rhsp->isQuad()) { rhsp = new AstCCast{fl, rhsp, nodep}; }
|
|
AstNode* const newp = new AstOr{
|
|
fl, new AstShiftL{fl, lhsp, new AstConst{fl, rhsshift}, nodep->width()}, rhsp};
|
|
newp->dtypeFrom(nodep); // Unsigned
|
|
VL_DO_DANGLING(replaceWithDelete(nodep, newp), nodep);
|
|
}
|
|
}
|
|
bool expandWide(AstNodeAssign* nodep, AstConcat* rhsp) {
|
|
UINFO(8, " Wordize ASSIGN(CONCAT) " << nodep << endl);
|
|
if (!doExpand(rhsp)) return false;
|
|
FileLine* const fl = rhsp->fileline();
|
|
// Lhs or Rhs may be word, long, or quad.
|
|
// newAstWordSelClone nicely abstracts the difference.
|
|
const int rhsshift = rhsp->rhsp()->widthMin();
|
|
// Sometimes doing the words backwards is preferable.
|
|
// When we have x={x,foo} backwards is better, when x={foo,x} forward is better
|
|
// However V3Subst tends to rip this up, so not worth optimizing now.
|
|
for (int w = 0; w < rhsp->widthWords(); ++w) {
|
|
addWordAssign(nodep, w,
|
|
new AstOr{fl, newWordGrabShift(fl, w, rhsp->lhsp(), rhsshift),
|
|
newAstWordSelClone(rhsp->rhsp(), w)});
|
|
}
|
|
return true;
|
|
}
|
|
|
|
virtual void visit(AstReplicate* nodep) override {
|
|
if (nodep->user1SetOnce()) return; // Process once
|
|
iterateChildren(nodep);
|
|
if (nodep->isWide()) {
|
|
// See under ASSIGN(WIDE)
|
|
} else {
|
|
FileLine* const fl = nodep->fileline();
|
|
AstNode* lhsp = nodep->lhsp()->unlinkFrBack();
|
|
AstNode* newp;
|
|
const int lhswidth = lhsp->widthMin();
|
|
if (lhswidth == 1) {
|
|
UINFO(8, " REPLICATE(w1) " << nodep << endl);
|
|
newp = new AstNegate{fl, lhsp};
|
|
} else {
|
|
UINFO(8, " REPLICATE " << nodep << endl);
|
|
const AstConst* const constp = VN_AS(nodep->rhsp(), Const);
|
|
UASSERT_OBJ(constp, nodep,
|
|
"Replication value isn't a constant. Checked earlier!");
|
|
const uint32_t times = constp->toUInt();
|
|
if (nodep->isQuad() && !lhsp->isQuad()) { lhsp = new AstCCast{fl, lhsp, nodep}; }
|
|
newp = lhsp->cloneTree(true);
|
|
for (unsigned repnum = 1; repnum < times; repnum++) {
|
|
const int rhsshift = repnum * lhswidth;
|
|
newp = new AstOr{
|
|
fl,
|
|
new AstShiftL{fl, lhsp->cloneTree(true),
|
|
new AstConst{fl, static_cast<uint32_t>(rhsshift)},
|
|
nodep->width()},
|
|
newp};
|
|
newp->dtypeFrom(nodep); // Unsigned
|
|
}
|
|
VL_DO_DANGLING(lhsp->deleteTree(), lhsp); // Never used
|
|
}
|
|
newp->dtypeFrom(nodep); // Unsigned
|
|
VL_DO_DANGLING(replaceWithDelete(nodep, newp), nodep);
|
|
}
|
|
}
|
|
bool expandWide(AstNodeAssign* nodep, AstReplicate* rhsp) {
|
|
UINFO(8, " Wordize ASSIGN(REPLICATE) " << nodep << endl);
|
|
if (!doExpand(rhsp)) return false;
|
|
FileLine* const fl = nodep->fileline();
|
|
AstNode* const lhsp = rhsp->lhsp();
|
|
const int lhswidth = lhsp->widthMin();
|
|
const AstConst* const constp = VN_AS(rhsp->rhsp(), Const);
|
|
UASSERT_OBJ(constp, rhsp, "Replication value isn't a constant. Checked earlier!");
|
|
const uint32_t times = constp->toUInt();
|
|
for (int w = 0; w < rhsp->widthWords(); ++w) {
|
|
AstNode* newp;
|
|
if (lhswidth == 1) {
|
|
newp = new AstNegate{fl, lhsp->cloneTree(true)};
|
|
// Replicate always unsigned
|
|
newp->dtypeSetLogicSized(VL_EDATASIZE, VSigning::UNSIGNED);
|
|
} else {
|
|
newp = newAstWordSelClone(lhsp, w);
|
|
FileLine* const rfl = rhsp->fileline();
|
|
for (unsigned repnum = 1; repnum < times; repnum++) {
|
|
newp = new AstOr{fl, newWordGrabShift(rfl, w, lhsp, lhswidth * repnum), newp};
|
|
}
|
|
}
|
|
addWordAssign(nodep, w, newp);
|
|
}
|
|
return true;
|
|
}
|
|
|
|
void visitEqNeq(AstNodeBiop* nodep) {
|
|
if (nodep->user1SetOnce()) return; // Process once
|
|
iterateChildren(nodep);
|
|
if (nodep->lhsp()->isWide()) {
|
|
UINFO(8, " Wordize EQ/NEQ " << nodep << endl);
|
|
// -> (0=={or{for each_word{WORDSEL(lhs,#)^WORDSEL(rhs,#)}}}
|
|
FileLine* const fl = nodep->fileline();
|
|
AstNode* newp = nullptr;
|
|
for (int w = 0; w < nodep->lhsp()->widthWords(); ++w) {
|
|
AstNode* const eqp = new AstXor{fl, newAstWordSelClone(nodep->lhsp(), w),
|
|
newAstWordSelClone(nodep->rhsp(), w)};
|
|
newp = newp ? new AstOr{fl, newp, eqp} : eqp;
|
|
}
|
|
if (VN_IS(nodep, Neq)) {
|
|
newp = new AstNeq{fl, new AstConst{fl, AstConst::SizedEData(), 0}, newp};
|
|
} else {
|
|
newp = new AstEq{fl, new AstConst{fl, AstConst::SizedEData(), 0}, newp};
|
|
}
|
|
VL_DO_DANGLING(replaceWithDelete(nodep, newp), nodep);
|
|
}
|
|
}
|
|
virtual void visit(AstEq* nodep) override { visitEqNeq(nodep); }
|
|
virtual void visit(AstNeq* nodep) override { visitEqNeq(nodep); }
|
|
|
|
virtual void visit(AstRedOr* nodep) override {
|
|
if (nodep->user1SetOnce()) return; // Process once
|
|
iterateChildren(nodep);
|
|
FileLine* const fl = nodep->fileline();
|
|
if (nodep->lhsp()->isWide()) {
|
|
UINFO(8, " Wordize REDOR " << nodep << endl);
|
|
// -> (0!={or{for each_word{WORDSEL(lhs,#)}}}
|
|
AstNode* newp = nullptr;
|
|
for (int w = 0; w < nodep->lhsp()->widthWords(); ++w) {
|
|
AstNode* const eqp = newAstWordSelClone(nodep->lhsp(), w);
|
|
newp = newp ? new AstOr{fl, newp, eqp} : eqp;
|
|
}
|
|
newp = new AstNeq{fl, new AstConst{fl, AstConst::SizedEData(), 0}, newp};
|
|
VL_DO_DANGLING(replaceWithDelete(nodep, newp), nodep);
|
|
} else {
|
|
UINFO(8, " REDOR->EQ " << nodep << endl);
|
|
AstNode* const lhsp = nodep->lhsp()->unlinkFrBack();
|
|
AstNode* const newp = new AstNeq{
|
|
fl, new AstConst{fl, AstConst::WidthedValue(), longOrQuadWidth(nodep), 0}, lhsp};
|
|
VL_DO_DANGLING(replaceWithDelete(nodep, newp), nodep);
|
|
}
|
|
}
|
|
virtual void visit(AstRedAnd* nodep) override {
|
|
if (nodep->user1SetOnce()) return; // Process once
|
|
iterateChildren(nodep);
|
|
FileLine* const fl = nodep->fileline();
|
|
if (nodep->lhsp()->isWide()) {
|
|
UINFO(8, " Wordize REDAND " << nodep << endl);
|
|
// -> (0!={and{for each_word{WORDSEL(lhs,#)}}}
|
|
AstNode* newp = nullptr;
|
|
for (int w = 0; w < nodep->lhsp()->widthWords(); ++w) {
|
|
AstNode* eqp = newAstWordSelClone(nodep->lhsp(), w);
|
|
if (w == nodep->lhsp()->widthWords() - 1) {
|
|
// Rather than doing a (slowish) ==##, we OR in the
|
|
// bits that aren't part of the mask
|
|
eqp = new AstOr{fl, new AstConst{fl, notWideMask(nodep->lhsp())},
|
|
// Bug in cppcheck
|
|
// cppcheck-suppress memleak
|
|
eqp};
|
|
}
|
|
newp = newp ? new AstAnd{fl, newp, eqp} : eqp;
|
|
}
|
|
newp = new AstEq{fl, new AstConst{fl, AstConst::SizedEData(), VL_MASK_E(VL_EDATASIZE)},
|
|
newp};
|
|
VL_DO_DANGLING(replaceWithDelete(nodep, newp), nodep);
|
|
} else {
|
|
UINFO(8, " REDAND->EQ " << nodep << endl);
|
|
AstNode* const lhsp = nodep->lhsp()->unlinkFrBack();
|
|
AstNode* const newp = new AstEq{fl, new AstConst{fl, wordMask(lhsp)}, lhsp};
|
|
VL_DO_DANGLING(replaceWithDelete(nodep, newp), nodep);
|
|
}
|
|
}
|
|
virtual void visit(AstRedXor* nodep) override {
|
|
if (nodep->user1SetOnce()) return; // Process once
|
|
iterateChildren(nodep);
|
|
if (nodep->lhsp()->isWide()) {
|
|
UINFO(8, " Wordize REDXOR " << nodep << endl);
|
|
// -> (0!={redxor{for each_word{XOR(WORDSEL(lhs,#))}}}
|
|
FileLine* const fl = nodep->fileline();
|
|
AstNode* newp = nullptr;
|
|
for (int w = 0; w < nodep->lhsp()->widthWords(); ++w) {
|
|
AstNode* const eqp = newAstWordSelClone(nodep->lhsp(), w);
|
|
newp = newp ? new AstXor{fl, newp, eqp} : eqp;
|
|
}
|
|
newp = new AstRedXor{fl, newp};
|
|
UINFO(8, " Wordize REDXORnew " << newp << endl);
|
|
VL_DO_DANGLING(replaceWithDelete(nodep, newp), nodep);
|
|
}
|
|
// We don't reduce non-wide XORs, as its more efficient to use a temp register,
|
|
// which the inlined function does nicely.
|
|
}
|
|
|
|
virtual void visit(AstNodeStmt* nodep) override {
|
|
if (nodep->user1SetOnce()) return; // Process once
|
|
if (!nodep->isStatement()) {
|
|
iterateChildren(nodep);
|
|
return;
|
|
}
|
|
m_stmtp = nodep;
|
|
iterateChildren(nodep);
|
|
m_stmtp = nullptr;
|
|
}
|
|
virtual void visit(AstNodeAssign* nodep) override {
|
|
if (nodep->user1SetOnce()) return; // Process once
|
|
m_stmtp = nodep;
|
|
iterateChildren(nodep);
|
|
bool did = false;
|
|
if (nodep->isWide() && ((VN_IS(nodep->lhsp(), VarRef) || VN_IS(nodep->lhsp(), ArraySel)))
|
|
&& ((VN_IS(nodep->lhsp(), VarRef) || VN_IS(nodep->lhsp(), ArraySel)))
|
|
&& !AstVar::scVarRecurse(nodep->lhsp()) // Need special function for SC
|
|
&& !AstVar::scVarRecurse(nodep->rhsp())) {
|
|
if (AstConst* const rhsp = VN_CAST(nodep->rhsp(), Const)) {
|
|
did = expandWide(nodep, rhsp);
|
|
} else if (AstVarRef* const rhsp = VN_CAST(nodep->rhsp(), VarRef)) {
|
|
did = expandWide(nodep, rhsp);
|
|
} else if (AstSel* const rhsp = VN_CAST(nodep->rhsp(), Sel)) {
|
|
did = expandWide(nodep, rhsp);
|
|
} else if (AstArraySel* const rhsp = VN_CAST(nodep->rhsp(), ArraySel)) {
|
|
did = expandWide(nodep, rhsp);
|
|
} else if (AstConcat* const rhsp = VN_CAST(nodep->rhsp(), Concat)) {
|
|
did = expandWide(nodep, rhsp);
|
|
} else if (AstReplicate* const rhsp = VN_CAST(nodep->rhsp(), Replicate)) {
|
|
did = expandWide(nodep, rhsp);
|
|
} else if (AstAnd* const rhsp = VN_CAST(nodep->rhsp(), And)) {
|
|
did = expandWide(nodep, rhsp);
|
|
} else if (AstOr* const rhsp = VN_CAST(nodep->rhsp(), Or)) {
|
|
did = expandWide(nodep, rhsp);
|
|
} else if (AstNot* const rhsp = VN_CAST(nodep->rhsp(), Not)) {
|
|
did = expandWide(nodep, rhsp);
|
|
} else if (AstXor* const rhsp = VN_CAST(nodep->rhsp(), Xor)) {
|
|
did = expandWide(nodep, rhsp);
|
|
} else if (AstNodeCond* const rhsp = VN_CAST(nodep->rhsp(), NodeCond)) {
|
|
did = expandWide(nodep, rhsp);
|
|
}
|
|
} else if (AstSel* const lhsp = VN_CAST(nodep->lhsp(), Sel)) {
|
|
did = expandLhs(nodep, lhsp);
|
|
}
|
|
// Cleanup common code
|
|
if (did) VL_DO_DANGLING(nodep->unlinkFrBack()->deleteTree(), nodep);
|
|
m_stmtp = nullptr;
|
|
}
|
|
|
|
//--------------------
|
|
virtual void visit(AstVar*) override {} // Don't hit varrefs under vars
|
|
virtual void visit(AstNode* nodep) override { iterateChildren(nodep); }
|
|
|
|
public:
|
|
// CONSTRUCTORS
|
|
explicit ExpandVisitor(AstNetlist* nodep) { iterate(nodep); }
|
|
virtual ~ExpandVisitor() override {
|
|
V3Stats::addStat("Optimizations, expand wides", m_statWides);
|
|
V3Stats::addStat("Optimizations, expand wide words", m_statWideWords);
|
|
V3Stats::addStat("Optimizations, expand limited", m_statWideLimited);
|
|
}
|
|
};
|
|
|
|
//----------------------------------------------------------------------
|
|
// Top loop
|
|
|
|
//######################################################################
|
|
// Expand class functions
|
|
|
|
void V3Expand::expandAll(AstNetlist* nodep) {
|
|
UINFO(2, __FUNCTION__ << ": " << endl);
|
|
{ ExpandVisitor{nodep}; } // Destruct before checking
|
|
V3Global::dumpCheckGlobalTree("expand", 0, v3Global.opt.dumpTreeLevel(__FILE__) >= 3);
|
|
}
|