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CopyPropagation.cpp
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CopyPropagation.cpp
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/*******************************************************************************
* Copyright (c) 2000, 2020 IBM Corp. and others
*
* This program and the accompanying materials are made available under
* the terms of the Eclipse Public License 2.0 which accompanies this
* distribution and is available at http://eclipse.org/legal/epl-2.0
* or the Apache License, Version 2.0 which accompanies this distribution
* and is available at https://www.apache.org/licenses/LICENSE-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License, v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception [1] and GNU General Public
* License, version 2 with the OpenJDK Assembly Exception [2].
*
* [1] https://www.gnu.org/software/classpath/license.html
* [2] http://openjdk.java.net/legal/assembly-exception.html
*
* SPDX-License-Identifier: EPL-2.0 OR Apache-2.0 OR GPL-2.0 WITH Classpath-exception-2.0 OR LicenseRef-GPL-2.0 WITH Assembly-exception
*******************************************************************************/
#include "optimizer/CopyPropagation.hpp"
#include <stddef.h>
#include <stdint.h>
#include <string.h>
#include "codegen/CodeGenerator.hpp"
#include "env/FrontEnd.hpp"
#include "compile/Compilation.hpp"
#include "compile/SymbolReferenceTable.hpp"
#include "control/Options.hpp"
#include "control/Options_inlines.hpp"
#include "cs2/bitvectr.h"
#include "cs2/sparsrbit.h"
#include "env/IO.hpp"
#include "env/StackMemoryRegion.hpp"
#include "env/TRMemory.hpp"
#include "il/AliasSetInterface.hpp"
#include "il/Block.hpp"
#include "il/DataTypes.hpp"
#include "il/ILOpCodes.hpp"
#include "il/ILOps.hpp"
#include "il/Node.hpp"
#include "il/Node_inlines.hpp"
#include "il/ResolvedMethodSymbol.hpp"
#include "il/Symbol.hpp"
#include "il/SymbolReference.hpp"
#include "il/TreeTop.hpp"
#include "il/TreeTop_inlines.hpp"
#include "infra/Assert.hpp"
#include "infra/Cfg.hpp"
#include "infra/List.hpp"
#include "infra/CfgEdge.hpp"
#include "optimizer/Optimization.hpp"
#include "optimizer/Optimizations.hpp"
#include "optimizer/Optimization_inlines.hpp"
#include "optimizer/Optimizer.hpp"
#include "optimizer/UseDefInfo.hpp"
#include "optimizer/TransformUtil.hpp"
#include "ras/Debug.hpp"
#define OPT_DETAILS "O^O COPY PROPAGATION: "
void collectNodesForIsCorrectChecks(TR::Node * n, TR::list< TR::Node *> & checkNodes, TR::SparseBitVector & refsToCheckIfKilled, vcount_t vc);
TR_CopyPropagation::TR_CopyPropagation(TR::OptimizationManager *manager)
: TR::Optimization(manager),
_storeTreeTops((StoreTreeMapComparator()), StoreTreeMapAllocator(comp()->trMemory()->currentStackRegion())),
_useTreeTops((UseTreeMapComparator()), UseTreeMapAllocator(comp()->trMemory()->currentStackRegion()))
{}
template <class T>
TR::Node * getNodeParent(TR::Node * lookForNode, TR::Node * curNode, vcount_t visitCount, T & ci)
{
if (lookForNode == curNode)
return 0; // problematic
vcount_t oldVisitCount = curNode->getVisitCount();
if (oldVisitCount == visitCount)
return 0;
curNode->setVisitCount(visitCount);
for (size_t i = 0; i < curNode->getNumChildren(); i++)
{
if (curNode->getChild(i) == lookForNode)
{
ci = i;
return curNode;
}
else
{
TR::Node * ret = getNodeParent(lookForNode, curNode->getChild(i), visitCount, ci);
if (ret != 0)
{
return ret;
}
}
}
return 0;
}
bool foundInterferenceBetweenCurrentNodeAndPropagation(TR::Compilation * comp, bool trace, TR::Node * currentNode, TR::Node * storeNode, TR::list< TR::Node *> & checkNodes, TR::SparseBitVector & refsToCheckIfKilled)
{
bool result = false;
vcount_t save_vc = comp->getVisitCount();
TR::Node * valueNode = storeNode->getOpCode().isStore() ? storeNode->getValueChild() : storeNode;
if (currentNode->mayKill().containsAny(refsToCheckIfKilled, comp))
{
result = true;
}
if (trace)
{
comp->getDebug()->trace("foundInterferenceBetweenCurrentNodeAndPropagation: currentNode %p storeNode %p checkNodes [", currentNode, storeNode);
for (auto checkNodesCursor = checkNodes.begin(); checkNodesCursor != checkNodes.end(); ++checkNodesCursor)
{
comp->getDebug()->trace("%p ", (*checkNodesCursor));
}
comp->getDebug()->trace("] = %s\n", result ? "interference" : "ok");
}
comp->setVisitCount(save_vc);
currentNode->resetVisitCounts(save_vc);
valueNode->resetVisitCounts(save_vc);
return result;
}
// Replace _targetNode with _sourceTree everywhere in the block, if possible.
class TR_ExpressionPropagation
{
private:
TR::Compilation * _compilation;
bool _trace;
// Supplied by user
TR::TreeTop * _targetTreeTop;
TR::Node * _targetNode;
TR::Node * _sourceTree;
TR::Node * _originalDefNodeForSourceTree;
// Used by class
int32_t _targetChildIndex;
TR::Node * _parentOfTargetNode;
public:
TR_ExpressionPropagation(TR::Compilation * c, bool t) :
_compilation(c),
_trace(t),
_targetTreeTop(0),
_targetNode(0),
_sourceTree(0),
_originalDefNodeForSourceTree(0),
_targetChildIndex(-1),
_parentOfTargetNode(0)
{
}
TR::Compilation * comp()
{
return _compilation;
}
bool trace()
{
return _trace;
}
void setTargetTreeTop(TR::TreeTop * tt)
{
_targetTreeTop = tt;
}
void setTargetNode(TR::Node * tn)
{
_targetNode = tn;
TR_ASSERT(_targetTreeTop->getNode()->containsNode(_targetNode, comp()->incOrResetVisitCount()),
"_targetTreeTop->getNode() does not contain _targetNode!");
}
void setSourceTree(TR::Node * st)
{
_sourceTree = st;
}
void setOriginalDefNodeForSourceTree(TR::Node * dn)
{
_originalDefNodeForSourceTree = dn;
}
void perform()
{
// Assert all user supplied values are set.
TR_ASSERT(_targetTreeTop != 0, "_targetTreeTop is 0!");
TR_ASSERT(_targetNode != 0, "_targetNode is 0!");
TR_ASSERT(_sourceTree != 0, "_sourceTree is 0!");
TR_ASSERT(_originalDefNodeForSourceTree != 0, "_originalDefNodeForSourceTree is 0!");
// Assert that this class hasn't been used before.
TR_ASSERT(_targetChildIndex == -1, "_targetChildIndex is -1!");
TR_ASSERT(_parentOfTargetNode == 0, "_parentOfTargetNode is 0!");
// If all ok, then do:
replaceTargetNodeBySourceTree();
#ifdef J9_PROJECT_SPECIFIC
fixupBCDPrecisionIfRequired();
#endif
addConversionIfRequired();
propagateThroughToCommoningPoints();
}
private:
void replaceTargetNodeBySourceTree()
{
_parentOfTargetNode = getNodeParent(_targetNode, _targetTreeTop->getNode(), comp()->incOrResetVisitCount(), _targetChildIndex);
TR_ASSERT(_parentOfTargetNode != 0, "could not find _targetNode " POINTER_PRINTF_FORMAT " parent, _targetTreeTop root node " POINTER_PRINTF_FORMAT "!", _targetNode, _targetTreeTop->getNode());
TR_ASSERT(_parentOfTargetNode->getChild(_targetChildIndex) == _targetNode, "_targetChildIndex or _parentOfTargetNode is not correct?");
_parentOfTargetNode->setAndIncChild(_targetChildIndex, _sourceTree);
// We "unhooked" the node from its parent, so dec ref count.
_targetNode->decReferenceCount();
}
// The difference between this function and replaceTargetNodeBySourceTree is that this function does not set any class fields.
void replaceAllInstancesOfTargetNodeInTreeBySourceTree(TR::TreeTop * targetTreeTop, TR::Node * targetNode, TR::Node * sourceTree)
{
while (targetTreeTop->getNode()->containsNode(targetNode, comp()->incOrResetVisitCount()))
{
size_t childIndex;
TR::Node * parentNode = getNodeParent(targetNode, targetTreeTop->getNode(), comp()->incOrResetVisitCount(), childIndex);
TR_ASSERT(parentNode != 0, "parentNode == 0!");
if (trace())
{
comp()->getDebug()->trace("%s Propagating new RHS " POINTER_PRINTF_FORMAT " in place of old instance location " POINTER_PRINTF_FORMAT " child index %d\n",
OPT_DETAILS, sourceTree, parentNode, childIndex);
}
TR::Node * commonedNode = parentNode->getChild(childIndex);
parentNode->setAndIncChild(childIndex, sourceTree);
targetNode->decReferenceCount();
}
}
#ifdef J9_PROJECT_SPECIFIC
void fixupBCDPrecisionIfRequired()
{
TR::Node * oldNode = _targetNode; // existed before
TR::Node * newNode = _parentOfTargetNode->getChild(_targetChildIndex); // propagated
if (oldNode->getType().isBCD() && newNode->getType().isBCD())
{
int oldPrecision = 0;
int newPrecision = 0;
if (newNode->getNumChildren() == 2)
{
oldPrecision = oldNode->getDecimalPrecision();
newPrecision = newNode->getDecimalPrecision();
}
else
{
oldPrecision = oldNode->getDecimalPrecision();
int32_t oldSize = oldNode->getSize();
TR::DataType newDataType = newNode->getOpCode().hasSymbolReference() ? newNode->getSymbolReference()->getSymbol()->getDataType() : newNode->getDataType();
int32_t newSymSize = newNode->getOpCode().hasSymbolReference() ? newNode->getSymbolReference()->getSymbol()->getSize() : newNode->getSize();
newPrecision = TR::DataType::getBCDPrecisionFromSize(newDataType, newSymSize);
// for a oldNode with prec=30 and an newNode with prec=31 then if the symbol sizes match and the other checks
// below pass then can reduce the newPrecision to 30 so a pdModPrec correction is not needed (as the propagated symbol will not have
// the top nibble 30->31 set).
if (newNode->getType().isAnyPacked())
{
if (newPrecision > oldPrecision && // 31 > 30
oldPrecision == newNode->getDecimalPrecision() && // 30 == 30
oldSize == newNode->getSize() && // 16 == 16
oldSize == newSymSize) // 16 == 16
{
if (trace() || comp()->cg()->traceBCDCodeGen())
{
traceMsg(comp(), "reduce newPrecision %d->%d for odd to even truncation (origNode %s (%p) prec=%d, node %s (%p) prec=%d\n",
newPrecision, oldPrecision,
newNode->getOpCode().getName(), newNode, newNode->getDecimalPrecision(),
oldNode->getOpCode().getName(), oldNode, oldPrecision);
}
newPrecision = oldPrecision; // 31->30 -- no correction needed for same byte odd to even truncation if the origNode was only storing out the even $ of digits
}
}
}
TR_ASSERT(newPrecision >= oldPrecision, "newPrecision < oldPrecision (%d < %d) during copyPropagation\n", newPrecision, oldPrecision);
bool needsClean = _originalDefNodeForSourceTree && _originalDefNodeForSourceTree->mustClean();
bool needsPrecisionCorrection = oldPrecision != newPrecision;
if (needsClean || needsPrecisionCorrection)
{
dumpOptDetails(comp(),"node %p precision %d != propagated symRef #%d precision %d and/or needsClean (%s)\n",
oldNode, oldPrecision,
newNode->getSymbolReference()->getReferenceNumber(), newPrecision, needsClean?"yes":"no");
if (needsPrecisionCorrection)
{
TR::ILOpCodes modPrecOp = TR::ILOpCode::modifyPrecisionOpCode(_parentOfTargetNode->getChild(_targetChildIndex)->getDataType());
TR_ASSERT(modPrecOp != TR::BadILOp, "no bcd modify precision opcode found for node %p type %s\n",
_parentOfTargetNode->getChild(_targetChildIndex),
_parentOfTargetNode->getChild(_targetChildIndex)->getDataType().toString());
TR::Node * pdModPrecNode = TR::Node::create(modPrecOp, 1, _parentOfTargetNode->getChild(_targetChildIndex));
pdModPrecNode->setDecimalPrecision(oldPrecision); // set to existing node's precision
_parentOfTargetNode->setAndIncChild(_targetChildIndex, pdModPrecNode);
}
if (needsClean)
{
TR::ILOpCodes cleanOp = TR::ILOpCode::cleanOpCode(_parentOfTargetNode->getChild(_targetChildIndex)->getDataType());
TR_ASSERT(cleanOp != TR::BadILOp, "no bcd clean opcode found for node %p type %s\n",
_parentOfTargetNode->getChild(_targetChildIndex),
_parentOfTargetNode->getChild(_targetChildIndex)->getDataType().toString());
TR::Node * pdCleanNode = TR::Node::create(cleanOp, 1, _parentOfTargetNode->getChild(_targetChildIndex));
_parentOfTargetNode->setAndIncChild(_targetChildIndex, pdCleanNode);
}
}
}
}
#endif
void addConversionIfRequired()
{
TR::Node * oldNode = _targetNode; // existed before
TR::Node * newNode = _parentOfTargetNode->getChild(_targetChildIndex); // propagated
if (newNode->getType().getDataType() != oldNode->getType().getDataType())
{
// /* source */ /* target */
TR::ILOpCodes convOp = TR::ILOpCode::getProperConversion(newNode->getDataType(), oldNode->getDataType(), true);
TR_ASSERT(convOp != TR::BadILOp, "no conversion opcode found for old type %s to new type %s!\n",
oldNode->getDataType().toString(), newNode->getDataType().toString());
TR::Node * convNode = TR::Node::create(convOp, 1, _parentOfTargetNode->getChild(_targetChildIndex));
_parentOfTargetNode->setAndIncChild(_targetChildIndex, convNode);
}
}
void propagateThroughToCommoningPoints()
{
TR::Node * oldNode = _targetNode; // existed before
TR::Node * newNode = _parentOfTargetNode->getChild(_targetChildIndex); // propagated
// 1) Propagate this RHS change to anything with a commoned old node further down the block.
// Common the rematerialization instead - it should have the same value at that evaluation.
// 2) Make sure evaluation point did not change when old node was replaced.
// If there are more commoning sites for the old node, then take care of them.
if (oldNode->getReferenceCount() > 0)
{
// Step 1: Propagate this RHS change to anything with a commoned old node further down the block. Common the rematerialization instead.
// The idea is that we have replaced the RHS of some node, but other nodes further down the block could have commoned the old node.
// We want to replace those commonings with a commoning to the new RHS of the node because the value is the same.
// Get a list of load sym refs for the new rematerialized RHS - use this to see if any part of the new node is killed during tree traversal.
TR::list< TR::Node *> newCheckNodes(getTypedAllocator<TR::Node*>(comp()->allocator()));
TR::SparseBitVector newRefsToCheckIfKilled(comp()->allocator());
collectNodesForIsCorrectChecks(newNode, newCheckNodes, newRefsToCheckIfKilled, comp()->incOrResetVisitCount());
// Start at _targetTreeTop to replace other instances of _targetNode in _targetTreeTop as well as to the end of the block.
TR::TreeTop * cur_tt = _targetTreeTop;
while (cur_tt && (cur_tt->getNode()->getOpCodeValue() != TR::BBEnd))
{
// Replace multiple commonings with a while loop.
replaceAllInstancesOfTargetNodeInTreeBySourceTree(cur_tt, oldNode, newNode);
if (oldNode->getReferenceCount() == 0)
{
// Replaced all occurrences later in the block, bail out.
if (trace())
{
comp()->getDebug()->trace("%s Propagating new RHS " POINTER_PRINTF_FORMAT " stops because oldNode ref count = 0\n",
OPT_DETAILS, newNode);
}
break;
}
cur_tt = cur_tt->getNextTreeTop();
// Traverse extended basic blocks
while ((cur_tt->getNode()->getOpCodeValue() == TR::BBEnd) &&
(cur_tt->getNextTreeTop() &&
(cur_tt->getNextTreeTop()->getNode()->getOpCodeValue() == TR::BBStart) &&
(cur_tt->getNextTreeTop()->getNode()->getBlock()->isExtensionOfPreviousBlock())))
{
// BBEnd BBStart next node
cur_tt = cur_tt->getNextTreeTop()->getNextTreeTop();
}
}
// BBEnd of block could also have GlRegDeps
if (cur_tt && (cur_tt->getNode()->getOpCodeValue() == TR::BBEnd))
{
replaceAllInstancesOfTargetNodeInTreeBySourceTree(cur_tt, oldNode, newNode);
}
}
}
};
int32_t TR_CopyPropagation::perform()
{
if (trace())
traceMsg(comp(), "Starting CopyPropagation\n");
TR_UseDefInfo *useDefInfo = optimizer()->getUseDefInfo();
_canMaintainUseDefs = true;
if (useDefInfo == NULL)
{
{
if (trace())
traceMsg(comp(), "Can't do CopyPropagation, no use/def information\n");
return 0;
}
}
// Pre-compute and cache usedef information for compile time performance
useDefInfo->buildDefUseInfo();
// Required beyond the scope of the stack memory region
bool donePropagation = false;
{
TR::StackMemoryRegion stackMemoryRegion(*trMemory());
_cleanupTemps = false;
TR::TreeTop *currentTree = comp()->getStartTree();
while (currentTree)
{
TR::Node *currentNode = skipTreeTopAndGetNode(currentTree);
if (currentNode->getOpCode().isLikeDef())
_storeTreeTops[currentNode] = currentTree;
currentTree = currentTree->getNextTreeTop();
}
int32_t numDefsOnEntry = useDefInfo->getNumDefsOnEntry();
int32_t firstRealDefIndex = useDefInfo->getFirstDefIndex() + numDefsOnEntry;
int32_t lastDefIndex = useDefInfo->getLastDefIndex();
int32_t numDefNodes = lastDefIndex - firstRealDefIndex + 1;
typedef TR::typed_allocator<std::pair<int32_t const, int32_t>, TR::Region&> UDMapAllocator;
typedef std::less<int32_t> UDMapComparator;
typedef std::map<int32_t, int32_t, UDMapComparator, UDMapAllocator> UsesToBeFixedMap;
typedef std::map<int32_t, int32_t, UDMapComparator, UDMapAllocator> EquivalentDefMap;
UsesToBeFixedMap usesToBeFixed((UDMapComparator()), UDMapAllocator(trMemory()->currentStackRegion()));
EquivalentDefMap equivalentDefs((UDMapComparator()), UDMapAllocator(trMemory()->currentStackRegion()));
typedef TR::typed_allocator<std::pair<TR::Node* const, TR::deque<TR::Node*, TR::Region&>*>, TR::Region&> StoreNodeMapAllocator;
typedef std::less<TR::Node*> StoreNodeMapComparator;
typedef std::map<TR::Node*, TR::deque<TR::Node*, TR::Region&>*, StoreNodeMapComparator, StoreNodeMapAllocator> StoreNodeMap;
StoreNodeMap storeMap((StoreNodeMapComparator()), StoreNodeMapAllocator(trMemory()->currentStackRegion()));
TR::NodeChecklist checklist(comp());
_lookForOriginalDefs = false;
for (TR::TreeTop *tree = comp()->getStartTree(); tree; tree = tree->getNextTreeTop())
{
TR::Node *defNode = tree->getNode();
if (defNode->getOpCodeValue() == TR::BBStart && !defNode->getBlock()->isExtensionOfPreviousBlock())
{
storeMap.clear();
continue;
}
collectUseTrees(tree, tree->getNode(), checklist);
if (!(defNode->getOpCode().isStoreDirect()
&& defNode->getSymbolReference()->getSymbol()->isAutoOrParm()
&& !defNode->storedValueIsIrrelevant()))
continue;
TR::Node *rhsOfStoreDefNode = defNode->getChild(0);
int32_t i = defNode->getUseDefIndex();
if (i == 0)
continue;
auto storeLookup = storeMap.find(rhsOfStoreDefNode);
if (storeLookup != storeMap.end())
{
for (auto itr = storeLookup->second->begin(), end = storeLookup->second->end(); itr != end; ++itr)
{
TR::Node *prevDefNode = *itr;
int32_t j = prevDefNode->getUseDefIndex();
int32_t thisDefSlot = defNode->getSymbolReference()->getCPIndex();
int32_t prevDefSlot = prevDefNode->getSymbolReference()->getCPIndex();
bool thisSymRefIsPreferred = false;
if (thisDefSlot < 0) // pending pushes
thisSymRefIsPreferred = true;
else if (thisDefSlot < comp()->getOwningMethodSymbol(defNode->getSymbolReference()->getOwningMethodIndex())->getFirstJitTempIndex()) // autos and parms
thisSymRefIsPreferred = true;
bool prevSymRefIsPreferred = false;
if (prevDefSlot < 0) // pending pushes
prevSymRefIsPreferred = true;
else if (prevDefSlot < comp()->getOwningMethodSymbol(prevDefNode->getSymbolReference()->getOwningMethodIndex())->getFirstJitTempIndex()) // autos and parms
prevSymRefIsPreferred = true;
#ifdef J9_PROJECT_SPECIFIC
if (prevDefNode->getType().isBCD())
{
TR_ASSERT(defNode->getType().isBCD(),"expecting defNode to be a BCD type (dt=%s) when prevDefNode is a BCD type (dt=%s)\n",
defNode->getDataType().toString(),prevDefNode->getDataType().toString());
if (defNode->getType().isBCD() &&
defNode->getDataType() == prevDefNode->getDataType() &&
prevDefNode->getDecimalPrecision() == defNode->getDecimalPrecision() &&
(defNode->getDataType() != TR::PackedDecimal || prevDefNode->mustCleanSignInPDStoreEvaluator() == defNode->mustCleanSignInPDStoreEvaluator()))
{
dumpOptDetails(comp(), "%s Def nodes %p (precision = %d) and %p (precision = %d) are equivalent\n",OPT_DETAILS,
defNode,
defNode->getDecimalPrecision(),
prevDefNode,
prevDefNode->getDecimalPrecision());
auto equivalentDefLookup = equivalentDefs.find(j);
if ((!thisSymRefIsPreferred &&
(prevSymRefIsPreferred || (equivalentDefLookup != equivalentDefs.end()))))
{
if (trace())
traceMsg(comp(), "000setting i %d to j %d\n", i, j);
if (equivalentDefLookup == equivalentDefs.end())
{
if (i != j)
equivalentDefs[i] = j;
}
else if (i == equivalentDefLookup->second)
{
equivalentDefs.erase(i);
}
else
{
equivalentDefs[i] = equivalentDefLookup->second;
}
}
else if (equivalentDefs.find(j) == equivalentDefs.end())
{
if (trace())
traceMsg(comp(), "111setting j %d to i %d\n", j, i);
if (i != j)
equivalentDefs[j] = i;
}
}
}
else
#endif
{
dumpOptDetails(comp(), "%s Def nodes %p and %p are equivalent\n",OPT_DETAILS,
defNode,
prevDefNode);
auto equivalentDefLookup = equivalentDefs.find(j);
if ((!thisSymRefIsPreferred &&
(prevSymRefIsPreferred || (equivalentDefLookup != equivalentDefs.end()))))
{
if (trace())
traceMsg(comp(), "000setting i %d to j %d\n", i, j);
if (equivalentDefLookup == equivalentDefs.end())
{
if (i != j)
equivalentDefs[i] = j;
}
else if (i == equivalentDefLookup->second)
{
equivalentDefs.erase(i);
}
else
{
equivalentDefs[i] = equivalentDefLookup->second;
}
}
else if (equivalentDefs.find(j) == equivalentDefs.end())
{
if (trace())
traceMsg(comp(), "111setting j %d to i %d\n", j, i);
if (i != j)
equivalentDefs[j] = i;
}
}
break;
}
}
if (storeLookup == storeMap.end())
{
storeMap[rhsOfStoreDefNode] = new (trStackMemory()) TR::deque<TR::Node*, TR::Region&>(trMemory()->currentStackRegion());
storeMap[rhsOfStoreDefNode]->push_back(defNode);
}
else
{
storeMap[rhsOfStoreDefNode]->push_back(defNode);
}
}
int32_t firstUseIndex = useDefInfo->getFirstUseIndex();
for (auto itr = equivalentDefs.begin(), end = equivalentDefs.end(); itr != end; ++itr)
{
int32_t defIndex = itr->first;
TR::Node *defNode = useDefInfo->getNode(defIndex);
TR::TreeTop *defTree = useDefInfo->getTreeTop(defIndex);
TR::TreeTop *extendedBlockEntry = defTree->getEnclosingBlock()->startOfExtendedBlock()->getEntry();
TR::TreeTop *extendedBlockExit = extendedBlockEntry->getExtendedBlockExitTreeTop();
if (defNode == NULL)
continue;
TR::Node *equivalentDefNode = useDefInfo->getNode(itr->second);
TR::TreeTop *equivalentDefTree = useDefInfo->getTreeTop(itr->second);
TR_UseDefInfo::BitVector uses(comp()->allocator());
useDefInfo->getUsesFromDef(uses, itr->first, useDefInfo->hasLoadsAsDefs());
TR_UseDefInfo::BitVector::Cursor useCursor(uses);
for (useCursor.SetToFirstOne(); useCursor.Valid(); useCursor.SetToNextOne())
{
int32_t i = useCursor + firstUseIndex;
TR_UseDefInfo::BitVector defs(comp()->allocator());
useDefInfo->getUseDef(defs, i);
// could use "if (defs.PopulationCount() == 1) continue", but this is more efficient
TR_UseDefInfo::BitVector::Cursor cursor(defs);
cursor.SetToFirstOne();
if (!cursor.Valid())
continue;
int32_t defIndex = cursor;
cursor.SetToNextOne();
if (cursor.Valid())
continue;
TR::Node *useNode = useDefInfo->getNode(i);
if (!useNode || useNode->getReferenceCount() == 0)
continue;
// Now we know there is a single definition for this use node
//
TR::SymbolReference *copySymbolReference = defNode->getSymbolReference();
if (performTransformation(comp(), "%s Copy1 Propagation replacing Copy symRef #%d %p %p\n",OPT_DETAILS, copySymbolReference->getReferenceNumber(), defNode, equivalentDefNode))
{
comp()->setOsrStateIsReliable(false); // could check if the propagation was done to a child of the OSR helper call here
_storeTree = NULL;
_useTree = NULL;
_storeBlock = NULL;
if (!isCorrectToReplace(useNode, equivalentDefNode, defs, useDefInfo))
continue;
TR::TreeTop *cursorTree = extendedBlockEntry;
bool defSeenFirst = false;
bool equivalentDefSeenFirst = false;
while (cursorTree != extendedBlockExit)
{
if (cursorTree == defTree)
{
defSeenFirst = true;
break;
}
if (cursorTree == equivalentDefTree)
{
equivalentDefSeenFirst = true;
break;
}
cursorTree = cursorTree->getNextTreeTop();
}
bool safe = true;
if (defSeenFirst)
{
cursorTree = defTree;
while (cursorTree != equivalentDefTree)
{
if (!cursorTree->getNode()->getOpCode().isStore() ||
(cursorTree->getNode()->getFirstChild() != defNode->getFirstChild()))
{
safe = false;
break;
}
cursorTree = cursorTree->getNextTreeTop();
}
}
if (!safe)
continue;
TR::SymbolReference *originalSymbolReference = equivalentDefNode->getSymbolReference();
dumpOptDetails(comp(), "%s By Original symRef #%d in Use node : %p\n",OPT_DETAILS, originalSymbolReference->getReferenceNumber(), useNode);
dumpOptDetails(comp(), "%s Use #%d[%p] is defined by:\n",OPT_DETAILS,i,useNode);
dumpOptDetails(comp(), "%s Def #%d[%p]\n",OPT_DETAILS, defIndex,useDefInfo->getNode(defIndex));
comp()->incOrResetVisitCount();
replaceCopySymbolReferenceByOriginalIn(copySymbolReference, equivalentDefNode, useNode, defNode);
usesToBeFixed[useNode->getUseDefIndex()] = equivalentDefs[defIndex];
donePropagation = true;
if (trace())
{
traceMsg(comp(), " Use #%d[%p] :\n",useNode->getUseDefIndex(),useNode);
traceMsg(comp(), " Does NOT get Defined by #%d[%p] from now\n",defNode->getUseDefIndex(), defNode);
}
if (trace())
{
traceMsg(comp(), " Use #%d[%p] is defined by:\n",useNode->getUseDefIndex(), useNode);
traceMsg(comp(), " Added New Def #%d[%p]\n",defIndex,useDefInfo->getNode(equivalentDefs[defIndex]));
}
if (trace())
traceMsg(comp(), "\n");
}
}
}
bool invalidateDefUseInfo = false;
int32_t lastUseIndex = useDefInfo->getLastUseIndex();
for (auto itr = usesToBeFixed.begin(), end = usesToBeFixed.end(); itr != end; )
{
int32_t fixUseIndex = itr->first;
TR::Node *fixUseNode = useDefInfo->getNode(fixUseIndex);
invalidateDefUseInfo = true;
if (useDefInfo->hasLoadsAsDefs())
{
for (int32_t i = useDefInfo->getFirstUseIndex(); i <= lastUseIndex; i++)
{
TR::Node *useNode = useDefInfo->getNode(i);
if (!useNode || useNode->getReferenceCount() == 0)
continue;
if (useDefInfo->getSingleDefiningLoad(useNode) == fixUseNode)
{
TR_UseDefInfo::BitVector defsOfUseToBeFixed(comp()->allocator());
if (useDefInfo->getUseDef(defsOfUseToBeFixed, fixUseIndex))
{
TR_UseDefInfo::BitVector::Cursor cursor(defsOfUseToBeFixed);
for (cursor.SetToFirstOne(); cursor.Valid(); cursor.SetToNextOne())
{
int32_t nextDef = cursor;
useDefInfo->setUseDef(i, nextDef);
}
}
useDefInfo->resetUseDef(i, fixUseIndex);
}
}
}
useDefInfo->clearUseDef(fixUseIndex);
useDefInfo->setUseDef(fixUseIndex, itr->second);
usesToBeFixed.erase(itr++);
}
if (_cleanupTemps)
rematerializeIndirectLoadsFromAutos();
_lookForOriginalDefs = true;
for (int32_t i = useDefInfo->getFirstUseIndex(); i <= lastUseIndex; i++)
{
TR_UseDefInfo::BitVector defs(comp()->allocator());
if (useDefInfo->getUseDef(defs, i))
{
TR::Node *useNode = useDefInfo->getNode(i);
_useTree = NULL;
if (!useNode) continue;
if (useNode->getReferenceCount() == 0) continue;
if (useNode->getOpCodeValue() == TR::loadaddr) continue;
TR::Node *loadNode, *baseNode;
int32_t regNumber;
TR::Node *defNode = areAllDefsInCorrectForm(useNode, defs, useDefInfo, firstRealDefIndex, loadNode, regNumber, baseNode);
if (!defNode) continue;
findUseTree(useNode);
TR_ASSERT(_useTree, "Did not find the tree for the use node\n");
TR::TreeTop *defTree = useDefInfo->getTreeTop(defNode->getUseDefIndex());
if (defTree->getEnclosingBlock()->startOfExtendedBlock() == _useTree->getEnclosingBlock()->startOfExtendedBlock())
{
// PR62462: LocalCSE is a fine and trustworthy opt, and we're not trying to do its job here.
// Our analysis (particularly of RegLoads) assumes it is propagating copies into successor blocks,
// and doesn't handle propagation within an extended block properly.
//
continue;
}
if (baseNode)
{
TR_ASSERT(baseNode->getOpCode().hasSymbolReference(), "baseNode should have a symbol reference\n");
if (!_cleanupTemps ||
baseNode->getSymbolReference() == defNode->getSymbolReference() ||
!isNodeAvailableInBlock(_useTree, baseNode))
continue;
}
bool isRegLoad = (regNumber != -1);
TR::Node *rhsOfStoreDefNode = defNode->getOpCode().isStoreIndirect() ? defNode->getSecondChild() : defNode->getFirstChild();
TR::SymbolReference *copySymbolReference = defNode->getOpCode().hasSymbolReference()?defNode->getSymbolReference():NULL;
bool baseAddrAvail = false;
TR::Node * baseAddr = NULL;
if (performTransformation(comp(), "%s Copy2 Propagation replacing Copy symRef #%d \n",OPT_DETAILS, copySymbolReference->getReferenceNumber()))
{
comp()->setOsrStateIsReliable(false); // could check if the propagation was done to a child of the OSR helper call here
dumpOptDetails(comp(), "%s Use #%d[%p] is defined by:\n",OPT_DETAILS,i,useNode);
TR_UseDefInfo::BitVector::Cursor cursor(defs);
for (cursor.SetToFirstOne(); cursor.Valid(); cursor.SetToNextOne())
{
int32_t defIndexTrace = cursor;
dumpOptDetails(comp(), "%s Def #%d[%p]\n",OPT_DETAILS, defIndexTrace,useDefInfo->getNode(defIndexTrace));
}
if (!isRegLoad &&
(loadNode->getOpCodeValue() != TR::loadaddr) && // loadaddr doesn't need to be anchored
(loadNode->getOpCode().hasSymbolReference()) &&
(loadNode->getSymbolReference() == copySymbolReference) &&
(rhsOfStoreDefNode != loadNode)) // Modifications to this condition should be mirrored in the NOTEMPS check above.
{
TR::TreeTop *anchorTree = findAnchorTree(defNode, loadNode);
// Need to create a temp for case like i = i + 1
TR::SymbolReference *newSymbolReference = comp()->getSymRefTab()->createTemporary(comp()->getMethodSymbol(), copySymbolReference->getSymbol()->getDataType(), false, copySymbolReference->getSymbol()->getSize());
dumpOptDetails(comp(), "%s created new temp #%d\n", OPT_DETAILS, newSymbolReference->getReferenceNumber());
TR::Node *store = TR::Node::createStore(newSymbolReference, TR::Node::createLoad(defNode, copySymbolReference));
anchorTree->insertBefore(TR::TreeTop::create(comp(), store));
loadNode->setSymbolReference(newSymbolReference);
}
donePropagation = true;
if (_propagatingWholeExpression)
{
dumpOptDetails(comp(), "%s Rematerializing whole expression %p to replace %p\n", OPT_DETAILS, rhsOfStoreDefNode, useNode);
}
else if (!isRegLoad)
{
dumpOptDetails(comp(), "%s By Original expression in %p Use node : %p\n", OPT_DETAILS, rhsOfStoreDefNode, useNode);
}
else
{
dumpOptDetails(comp(), "%s By register number %d in Use node : %p\n", OPT_DETAILS, regNumber, useNode);
}
comp()->incOrResetVisitCount();
if (_propagatingWholeExpression)
{
invalidateDefUseInfo = true;
TR::Node * rematExpression = rhsOfStoreDefNode->getOpCode().isStore() ? rhsOfStoreDefNode->getValueChild() : rhsOfStoreDefNode;
TR::Node * newExpression = rematExpression->duplicateTree();
if (!optimizer()->areSyntacticallyEquivalent(rematExpression, newExpression, comp()->incOrResetVisitCount()))
{
TR_ASSERT(0, "bad equivalence");
}
TR_ExpressionPropagation expressionPropagator(comp(), trace());
expressionPropagator.setTargetTreeTop(_useTree);
expressionPropagator.setTargetNode(useNode);
expressionPropagator.setSourceTree(newExpression);
expressionPropagator.setOriginalDefNodeForSourceTree(defNode);
expressionPropagator.perform();
}
else if (!isRegLoad)
{
replaceCopySymbolReferenceByOriginalIn(copySymbolReference, rhsOfStoreDefNode, useNode, defNode, baseAddr, baseAddrAvail);
usesToBeFixed[useNode->getUseDefIndex()] = loadNode->getUseDefIndex();
}
else
{
TR::Node *regLoadNode = NULL;
TR::Block *useBlock = _useTree->getEnclosingBlock();
TR::Node *bbstartNode = useBlock->startOfExtendedBlock()->getEntry()->getNode();
if (bbstartNode->getNumChildren() > 0)
{
for (int i = 0; i < bbstartNode->getFirstChild()->getNumChildren(); i++)
{
TR::Node *child = bbstartNode->getFirstChild()->getChild(i);
if (child->getGlobalRegisterNumber() == regNumber)
{
regLoadNode = child;
break;
}
}
if (regLoadNode)
{
TR::TreeTop *cursorTree = useBlock->getEntry();
TR::TreeTop *exitTree = cursorTree->getExtendedBlockExitTreeTop()->getNextTreeTop();
while (cursorTree != exitTree)
{
replaceCopySymbolReferenceByOriginalRegLoadIn(regLoadNode, useNode, copySymbolReference, cursorTree->getNode(), NULL, -1);
cursorTree = cursorTree->getNextTreeTop();
}
}
}
}
if (trace())
traceMsg(comp(), "\n");
}
}
}
if (_cleanupTemps)
commonIndirectLoadsFromAutos();
for (auto itr = usesToBeFixed.begin(), end = usesToBeFixed.end(); itr != end; ++itr)
{
int32_t fixUseIndex = itr->first;
TR::Node *fixUseNode = useDefInfo->getNode(fixUseIndex);
invalidateDefUseInfo = true;
if (useDefInfo->hasLoadsAsDefs())
{
for (int32_t i = useDefInfo->getFirstUseIndex(); i <= lastUseIndex; i++)
{
TR::Node *useNode = useDefInfo->getNode(i);
if (!useNode || useNode->getReferenceCount() == 0)
continue;
if (useDefInfo->getSingleDefiningLoad(useNode) == fixUseNode)
{
TR_UseDefInfo::BitVector defsOfUseToBeFixed(comp()->allocator());
if (useDefInfo->getUseDef(defsOfUseToBeFixed, fixUseIndex))
{
TR_UseDefInfo::BitVector::Cursor cursor(defsOfUseToBeFixed);
for (cursor.SetToFirstOne(); cursor.Valid(); cursor.SetToNextOne())
{
int32_t nextDef = cursor;
useDefInfo->setUseDef(i, nextDef);
}
useDefInfo->resetUseDef(i, fixUseIndex);
}
}
}
}
useDefInfo->clearUseDef(fixUseIndex);
if (useDefInfo->hasLoadsAsDefs())
{
useDefInfo->setUseDef(fixUseIndex, itr->second);
}
else if (itr->second != 0)
{
TR_UseDefInfo::BitVector defsOfRhs(comp()->allocator());
if (useDefInfo->getUseDef(defsOfRhs, itr->second))
{
TR_UseDefInfo::BitVector::Cursor cursor(defsOfRhs);
for (cursor.SetToFirstOne(); cursor.Valid(); cursor.SetToNextOne())
{
int32_t nextDef = cursor;