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InductionVariable.cpp
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InductionVariable.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/InductionVariable.hpp"
#include <limits.h>
#include <stdint.h>
#include <stdio.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/llistof.h"
#include "cs2/sparsrbit.h"
#include "env/CompilerEnv.hpp"
#include "env/StackMemoryRegion.hpp"
#include "env/TRMemory.hpp"
#include "env/jittypes.h"
#include "il/AliasSetInterface.hpp"
#include "il/AutomaticSymbol.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/ParameterSymbol.hpp"
#include "il/Symbol.hpp"
#include "il/SymbolReference.hpp"
#include "il/TreeTop.hpp"
#include "il/TreeTop_inlines.hpp"
#include "infra/Array.hpp"
#include "infra/Assert.hpp"
#include "infra/BitVector.hpp"
#include "infra/Cfg.hpp"
#include "infra/Checklist.hpp"
#include "infra/ILWalk.hpp"
#include "infra/List.hpp"
#include "infra/CfgEdge.hpp"
#include "infra/CfgNode.hpp"
#include "optimizer/Optimization.hpp"
#include "optimizer/Optimization_inlines.hpp"
#include "optimizer/Optimizations.hpp"
#include "optimizer/Optimizer.hpp"
#include "optimizer/RegisterCandidate.hpp"
#include "optimizer/Structure.hpp"
#include "optimizer/Dominators.hpp"
#include "optimizer/UseDefInfo.hpp"
#include "optimizer/LoopCanonicalizer.hpp"
#include "optimizer/VPConstraint.hpp"
#include "ras/Debug.hpp"
#define OPT_DETAILS "O^O INDUCTION VARIABLE ANALYSIS: "
// this is actually half of the threshold required
// because for every internal pointer temp created, there is a
// corresponding pinning array temp store
#define MAX_INTERNAL_POINTER_AUTOS_INITIALIZED 1
#define GET32BITINT(n) ((n)->getType().isInt32()?(n)->getInt():(int32_t)((n)->getLongInt()))
#define GET64BITINT(n) ((n)->getType().isInt32()?(int64_t)((n)->getInt()):(n)->getLongInt())
TR_LoopStrider::TR_LoopStrider(TR::OptimizationManager *manager)
: TR_LoopTransformer(manager),
_reassociatedNodes(trMemory()),
_storeTreesSingleton((StoreTreeMapComparator()), StoreTreeMapAllocator(comp()->trMemory()->currentStackRegion()))
{
_indirectInductionVariable = false; // TODO: add this c->getMethodHotness() >= scorching;
_autosAccessed = NULL;
_numInternalPointers = 0;
}
int32_t TR_LoopStrider::perform()
{
//static bool internalPtrs = !feGetEnv("TR_disableInternalPtrs");
//if (!internalPtrs)
// return 0;
//if (!cg()->supportsInternalPointers())
// return 0;
//
bool usingAladd = (comp()->target().is64Bit()) ?
true : false;
static char *disableSignExtn = feGetEnv("TR_disableSelIndVar");
_registersScarce = cg()->areAssignableGPRsScarce();
TR::StackMemoryRegion stackMemoryRegion(*trMemory());
_hoistedAutos = new (stackMemoryRegion) SymRefPairMap((SymRefPairMapComparator()), SymRefPairMapAllocator(stackMemoryRegion));
_reassociatedAutos = new (stackMemoryRegion) SymRefMap((SymRefMapComparator()), SymRefMapAllocator(stackMemoryRegion));
_count = 0;
_newTempsCreated = false;
_newNonAddressTempsCreated = false;
_storeTreesList = NULL;
//_loadUsedInNewLoopIncrementList = NULL;
// 64-bit sign-extension elimination
if (usingAladd && !disableSignExtn)
{
TR_UseDefInfo *info = optimizer()->getUseDefInfo();
// find induction variable candidates that can possibly be changed to longs
TR::NodeChecklist exLoads(comp());
detectLoopsForIndVarConversion(comp()->getFlowGraph()->getStructure(), exLoads);
if (_newTempsCreated)
{
eliminateSignExtensions(exLoads);
optimizer()->setUseDefInfo(NULL);
}
}
detectCanonicalizedPredictableLoops(comp()->getFlowGraph()->getStructure(), NULL, -1);
if (_newTempsCreated)
{
requestOpt(OMR::globalValuePropagation);
requestOpt(OMR::treeSimplification);
optimizer()->setAliasSetsAreValid(false);
}
if (_newNonAddressTempsCreated)
requestOpt(OMR::loopVersionerGroup);
return 2;
}
bool TR_LoopStrider::foundLoad(TR::TreeTop *storeTreeTop, TR::Node *node, int32_t symRefNum, vcount_t visitCount)
{
if (node->getVisitCount() == visitCount)
return false;
node->setVisitCount(visitCount);
if (node->getOpCode().isLoadVar() &&
(node->getSymbolReference()->getReferenceNumber() == symRefNum) &&
(node->getReferenceCount() > 1))
{
if (_storeTreesList)
{
auto lookup = _storeTreesList->find(symRefNum);
if (lookup != _storeTreesList->end())
{
List<TR_StoreTreeInfo> *storeTreesList = lookup->second;
ListIterator<TR_StoreTreeInfo> si(storeTreesList);
TR_StoreTreeInfo *storeTree;
for (storeTree = si.getCurrent(); storeTree != NULL; storeTree = si.getNext())
{
if (storeTree->_tt == storeTreeTop)
{
if (node != storeTree->_loadUsedInLoopIncrement)
return true;
}
}
}
}
else if (node != _loadUsedInLoopIncrement)
return true;
}
int32_t childNum;
for (childNum=0;childNum < node->getNumChildren(); childNum++)
{
if (foundLoad(storeTreeTop, node->getChild(childNum), symRefNum, visitCount))
return true;
}
return false;
}
bool TR_LoopStrider::foundLoad(TR::TreeTop *storeTree, int32_t nextInductionVariableNumber, TR::Compilation *comp)
{
TR::TreeTop *cursorTree = storeTree;
while (cursorTree->getNode()->getOpCodeValue() != TR::BBStart)
cursorTree = cursorTree->getPrevTreeTop();
bool storeInRequiredForm = true;
vcount_t visitCount = comp->incVisitCount();
while (cursorTree != storeTree)
{
if (foundLoad(storeTree, cursorTree->getNode(), nextInductionVariableNumber, visitCount))
{
storeInRequiredForm = false;
break;
}
cursorTree = cursorTree->getNextTreeTop();
}
return storeInRequiredForm;
}
static int32_t countInternalPointerOrPinningArrayStores(TR::Compilation *comp, TR::Block *block)
{
int32_t count = 0;
for (TR::TreeTop *tt = block->getEntry(); tt != block->getExit(); tt = tt->getNextTreeTop())
{
TR::Node *node = tt->getNode();
if (node->getOpCode().isStoreDirect() &&
((node->getSymbol()->isAuto() &&
(node->getSymbol()->castToAutoSymbol()->isInternalPointer() ||
node->getSymbol()->castToAutoSymbol()->isPinningArrayPointer())) ||
(node->getSymbol()->isParm() &&
node->getSymbol()->castToParmSymbol()->isPinningArrayPointer())))
count++;
}
return count;
}
int32_t TR_LoopStrider::detectCanonicalizedPredictableLoops(TR_Structure *loopStructure, TR_BitVector **optSetInfo, int32_t bitVectorSize)
{
// (64-bit)
// for aladds
bool usingAladd = (comp()->target().is64Bit()) ?
true : false;
TR_RegionStructure *regionStructure = loopStructure->asRegion();
if (regionStructure)
{
TR_StructureSubGraphNode *node;
TR_RegionStructure::Cursor si(*regionStructure);
for (node = si.getCurrent(); node != NULL; node = si.getNext())
detectCanonicalizedPredictableLoops(node->getStructure(), optSetInfo, bitVectorSize);
}
TR_BlockStructure *loopInvariantBlock = NULL;
if (!regionStructure ||
!regionStructure->getParent() ||
!regionStructure->isNaturalLoop() ||
regionStructure->getEntryBlock()->isCold())
return 0;
TR_ScratchList<TR::Block> blocksInRegion(trMemory());
regionStructure->getBlocks(&blocksInRegion);
ListIterator<TR::Block> blocksIt(&blocksInRegion);
TR::Block *nextBlock;
for (nextBlock = blocksIt.getCurrent(); nextBlock; nextBlock=blocksIt.getNext())
if (nextBlock->hasExceptionPredecessors())
return 0;
TR_RegionStructure *parentStructure = regionStructure->getParent()->asRegion();
TR_StructureSubGraphNode *subNode = NULL;
TR_RegionStructure::Cursor si(*parentStructure);
for (subNode = si.getCurrent(); subNode != NULL; subNode = si.getNext())
{
if (subNode->getNumber() == loopStructure->getNumber())
break;
}
if (subNode->getPredecessors().size() == 1)
{
TR_StructureSubGraphNode *loopInvariantNode = toStructureSubGraphNode(subNode->getPredecessors().front()->getFrom());
if (loopInvariantNode->getStructure()->asBlock() &&
loopInvariantNode->getStructure()->asBlock()->isLoopInvariantBlock())
loopInvariantBlock = loopInvariantNode->getStructure()->asBlock();
}
if (loopInvariantBlock)
{
int32_t symRefCount = comp()->getSymRefCount();
_numSymRefs = symRefCount;
initializeSymbolsWrittenAndReadExactlyOnce(symRefCount, notGrowable);
if (_storeTreesList == NULL)
_storeTreesList = &_storeTreesSingleton;
_storeTreesList->clear();
//_storeTreesList = (List<TR_StoreTreeInfo> **)trMemory()->allocateStackMemory(symRefCount*sizeof(List<TR_StoreTreeInfo> *));
//_loadUsedInNewLoopIncrementList = (List<TR::Node> **)trMemory()->allocateStackMemory(symRefCount*sizeof(List<TR::Node> *));
//memset(_storeTreesList, 0, symRefCount*sizeof(List<TR::TreeTop> *));
//int32_t i = 0;
//while (i < symRefCount)
// {
// _storeTreesList[i] = new (trStackMemory()) TR_ScratchList<TR_StoreTreeInfo>(trMemory());
// //_loadUsedInNewLoopIncrementList[i] = new (trStackMemory()) TR_ScratchList<TR::Node>(trMemory());
// i++;
// }
_reassociatedAutos->clear();
_hoistedAutos->clear();
_reassociatedNodes.deleteAll();
// compute the number of internal pointer temps or pinning array temps already initialized in
// the loop pre-header.
// on some platforms (z in particular), a long sequence of stores results in "VS Tag Not ready"
// stalls (aka store buffer stalls). This variable controls whether any induction variables are
// replaced by internal pointers by the analysis
//
_numInternalPointerOrPinningArrayTempsInitialized = 0;
if (1)
{
_numInternalPointerOrPinningArrayTempsInitialized += countInternalPointerOrPinningArrayStores(comp(), loopInvariantBlock->getBlock());
// check if there are multiple pre-headers (introduced by previous passes of loopCanonicalization)
//
TR_StructureSubGraphNode *loopInvariantNode = toStructureSubGraphNode(subNode->getPredecessors().front()->getFrom());
TR_StructureSubGraphNode *prevInvariantNode = NULL;
if (loopInvariantNode->getPredecessors().size() == 1)
prevInvariantNode = toStructureSubGraphNode(loopInvariantNode->getPredecessors().front()->getFrom());
if (prevInvariantNode &&
prevInvariantNode->getStructure()->asBlock() &&
prevInvariantNode->getStructure()->asBlock()->isLoopInvariantBlock())
{
_numInternalPointerOrPinningArrayTempsInitialized += countInternalPointerOrPinningArrayStores(comp(), prevInvariantNode->getStructure()->asBlock()->getBlock());
}
}
_autosAccessed = new (trStackMemory()) TR_BitVector(symRefCount, trMemory(), stackAlloc);
_numberOfLinearExprs = 0;
_parmAutoPairs = NULL;
if (trace())
traceMsg(comp(), "\nChecking loop %d for predictability\n", loopStructure->getNumber());
_isAddition = false;
TR::SymbolReferenceTable *symRefTab = comp()->getSymRefTab();
// this also collects info on symbols read and written exactly once
int32_t isPredictableLoop = checkLoopForPredictability(loopStructure, loopInvariantBlock->getBlock(), NULL, false);
vcount_t visitCount = 0;
if (isPredictableLoop > 0)
{
if (trace())
{
traceMsg(comp(), "\nDetected a predictable loop %d\n", loopStructure->getNumber());
traceMsg(comp(), "Possible new induction variable candidates :\n");
comp()->getDebug()->print(comp()->getOutFile(), &_writtenExactlyOnce);
traceMsg(comp(), "\n");
}
visitCount = comp()->incVisitCount();
if (_storeTreesList)
comp()->getSymRefTab()->getAllSymRefs(_writtenExactlyOnce);
// calculate _numberOfLinearExprs
identifyExpressionsLinearInInductionVariables(loopStructure, visitCount);
_linearEquations = (int64_t **)trMemory()->allocateStackMemory(_numberOfLinearExprs*sizeof(int64_t *));
memset(_linearEquations, 0, _numberOfLinearExprs*sizeof(int64_t *));
_loadUsedInNewLoopIncrement = (TR::Node **)trMemory()->allocateStackMemory(_numberOfLinearExprs*sizeof(TR::Node *));
memset(_loadUsedInNewLoopIncrement, 0, _numberOfLinearExprs*sizeof(TR::Node *));
int32_t j;
for (j=0;j<_numberOfLinearExprs;j++)
_linearEquations[j] = (int64_t *)trMemory()->allocateStackMemory(5*sizeof(int64_t));
_nextExpression = 0;
TR_ScratchList<TR::TreeTop> predictableComputations(trMemory());
TR::SymbolReference *newSymbolReference = NULL;
TR::SymbolReference *inductionVarSymRef = NULL;
if (_autosAccessed)
{
if (_autosAccessed->elementCount() < (comp()->cg()->getMaximumNumbersOfAssignableGPRs() - 5))
_registersScarce = false;
}
// Iterate over the symbols written once (possible induction variables)
//
TR::SparseBitVector::Cursor cursor(_writtenExactlyOnce);
for (cursor.SetToFirstOne(); cursor.Valid(); cursor.SetToNextOne())
{
int32_t nextInductionVariableNumber = cursor;
if (!symRefTab->getSymRef(nextInductionVariableNumber) ||
!symRefTab->getSymRef(nextInductionVariableNumber)->getSymbol()->isAutoOrParm())
continue;
_isAddition = false;
newSymbolReference = NULL;
inductionVarSymRef = NULL;
_loadUsedInLoopIncrement = NULL;
bool storeInRequiredForm = isStoreInRequiredForm(nextInductionVariableNumber, loopStructure);
// traceMsg(comp(), "storeInRequiredForm=%d for ind var=%d symRef=#%d\n", storeInRequiredForm, nextInductionVariableNumber,
// symRefTab->getSymRef(nextInductionVariableNumber)->getReferenceNumber());
//
// TODO: If there is a use of an induction variable that refers back to a load
// that occurs in a tree PRIOR to the increment/decrement,
// then we will not attempt to transform into derived induction variable
// as we might produce incorrect trees (wanted old value but will get new inced/deced value) .
//
if (storeInRequiredForm)
{
TR::TreeTop *storeTree = _storeTrees[nextInductionVariableNumber];
if (storeTree)
storeInRequiredForm = foundLoad(storeTree, nextInductionVariableNumber, comp());
if (storeInRequiredForm && _storeTreesList)
{
auto lookup = _storeTreesList->find(nextInductionVariableNumber);
if (lookup != _storeTreesList->end())
{
List<TR_StoreTreeInfo> *storeTreesList = lookup->second;
ListIterator<TR_StoreTreeInfo> si(storeTreesList);
TR_StoreTreeInfo *storeTree;
for (storeTree = si.getCurrent(); storeTree != NULL; storeTree = si.getNext())
{
//traceMsg(comp(), "store tree %p\n", storeTree->_tt->getNode());
storeInRequiredForm = foundLoad(storeTree->_tt, nextInductionVariableNumber, comp());
if (!storeInRequiredForm)
{
//traceMsg(comp(), "reject store tree %p\n", storeTree->_tt->getNode());
break;
}
}
}
}
}
else
continue;
bool isLoopTestInductionVariable = false;
bool loopTestCanBeChangedIfRequired = true;
int32_t maxFactorAllowed = 1;
TR::Node *storeOfDerivedInductionVariable = NULL;
int32_t loopTestHasSymRef = -1;
//traceMsg(comp(), "store in reqd form %d for ind var %d\n", storeInRequiredForm, nextInductionVariableNumber);
if (_loopTestTree->getNode()->getNumChildren() == 2)
{
TR::SymbolReference *indexSymRef = NULL;
TR::Node *firstChildOfLoopTestNode = _loopTestTree->getNode()->getFirstChild();
if ((firstChildOfLoopTestNode->getOpCodeValue() == TR::l2i) ||
(firstChildOfLoopTestNode->getOpCodeValue() == TR::i2l))
firstChildOfLoopTestNode = firstChildOfLoopTestNode->getFirstChild();
TR::Node *secondChildOfLoopTestNode = _loopTestTree->getNode()->getSecondChild();
if ((secondChildOfLoopTestNode->getOpCodeValue() == TR::l2i) ||
(secondChildOfLoopTestNode->getOpCodeValue() == TR::i2l))
secondChildOfLoopTestNode = secondChildOfLoopTestNode->getFirstChild();
if (firstChildOfLoopTestNode->getOpCode().hasSymbolReference())
{
indexSymRef = firstChildOfLoopTestNode->getSymbolReference();
loopTestHasSymRef = 0;
}
else
{
TR::TreeTop *storeTree = _storeTrees[nextInductionVariableNumber];
TR::Node *storeNode = storeTree->getNode();
if (!storeNode->getOpCode().isStore())
storeNode = storeNode->getFirstChild();
TR_ASSERT(storeNode->getOpCode().isStore(), "Expected to find a store\n");
if (firstChildOfLoopTestNode == storeNode->getFirstChild() && _loadUsedInLoopIncrement)
indexSymRef = storeNode->getSymbolReference();
else
{
if (_storeTreesList)
{
auto lookup = _storeTreesList->find(nextInductionVariableNumber);
if (lookup != _storeTreesList->end())
{
List<TR_StoreTreeInfo> *storeTreesList = lookup->second;
ListIterator<TR_StoreTreeInfo> si(storeTreesList);
TR_StoreTreeInfo *storeTree;
for (storeTree = si.getCurrent(); storeTree != NULL; storeTree = si.getNext())
{
TR::Node *storeNode = storeTree->_tt->getNode();
if (!storeNode->getOpCode().isStore())
storeNode = storeNode->getFirstChild();
TR_ASSERT(storeNode->getOpCode().isStore(), "Expected to find a store\n");
if (firstChildOfLoopTestNode == storeNode->getFirstChild() &&
storeTree->_loadUsedInLoopIncrement)
{
indexSymRef = storeNode->getSymbolReference();
break;
}
}
}
}
}
}
if (!secondChildOfLoopTestNode->getOpCode().isLoadConst() &&
!(secondChildOfLoopTestNode->getOpCode().isLoadVar() &&
secondChildOfLoopTestNode->getSymbolReference()->getSymbol()->isAutoOrParm() &&
_neverWritten->get(secondChildOfLoopTestNode->getSymbolReference()->getReferenceNumber())))
{
indexSymRef = NULL;
}
if (indexSymRef &&
indexSymRef->getReferenceNumber() == _loopDrivingInductionVar)
{
isLoopTestInductionVariable = true;
if (loopTestHasSymRef != 0)
loopTestHasSymRef = 1;
loopTestCanBeChangedIfRequired = false;
TR_InductionVariable *v = loopStructure->asRegion()->findMatchingIV(indexSymRef);
if (v && v->getEntry() && v->getExit())
{
TR::VPConstraint *entryVal = v->getEntry();
TR::VPConstraint *exitVal = v->getExit();
if (entryVal->asIntConstraint())
{
if (entryVal->getHighInt() <= TR::getMaxSigned<TR::Int32>()/8)
maxFactorAllowed = 8;
else if (entryVal->getHighInt() <= TR::getMaxSigned<TR::Int32>()/4)
maxFactorAllowed = 4;
else if (entryVal->getHighInt() <= TR::getMaxSigned<TR::Int32>()/2)
maxFactorAllowed = 2;
if (entryVal->getLowInt() >= TR::getMinSigned<TR::Int32>()/8)
{
if (maxFactorAllowed >= 8)
maxFactorAllowed = 8;
}
else if (entryVal->getLowInt() >= TR::getMinSigned<TR::Int32>()/4)
{
if (maxFactorAllowed >= 4)
maxFactorAllowed = 4;
}
else if (entryVal->getLowInt() >= TR::getMinSigned<TR::Int32>()/2)
{
if (maxFactorAllowed >= 2)
maxFactorAllowed = 2;
}
}
if (exitVal->asIntConstraint())
{
if (maxFactorAllowed > 1)
{
if (exitVal->getHighInt() <= TR::getMaxSigned<TR::Int32>()/8)
{
if (maxFactorAllowed >= 8)
maxFactorAllowed = 8;
}
else if (exitVal->getHighInt() <= TR::getMaxSigned<TR::Int32>()/4)
{
if (maxFactorAllowed >= 4)
maxFactorAllowed = 4;
}
else if (exitVal->getHighInt() <= TR::getMaxSigned<TR::Int32>()/2)
{
if (maxFactorAllowed >= 2)
maxFactorAllowed = 2;
}
if (exitVal->getLowInt() >= TR::getMinSigned<TR::Int32>()/8)
{
if (maxFactorAllowed >= 8)
maxFactorAllowed = 8;
}
else if (exitVal->getLowInt() >= TR::getMinSigned<TR::Int32>()/4)
{
if (maxFactorAllowed >= 4)
maxFactorAllowed = 4;
}
else if (exitVal->getLowInt() >= TR::getMinSigned<TR::Int32>()/2)
{
if (maxFactorAllowed >= 2)
maxFactorAllowed = 2;
}
}
}
if (entryVal->asLongConstraint())
{
if (entryVal->getHighLong() <= TR::getMaxSigned<TR::Int64>()/256)
maxFactorAllowed = 256;
else if (entryVal->getHighLong() <= TR::getMaxSigned<TR::Int64>()/8)
maxFactorAllowed = 8;
else if (entryVal->getHighLong() <= TR::getMaxSigned<TR::Int64>()/4)
maxFactorAllowed = 4;
else if (entryVal->getHighLong() <= TR::getMaxSigned<TR::Int64>()/2)
maxFactorAllowed = 2;
if (entryVal->getLowLong() >= TR::getMinSigned<TR::Int64>()/256)
{
if (maxFactorAllowed >= 256)
maxFactorAllowed = 256;
}
else if (entryVal->getLowLong() >= TR::getMinSigned<TR::Int64>()/8)
{
if (maxFactorAllowed >= 8)
maxFactorAllowed = 8;
}
else if (entryVal->getLowLong() >= TR::getMinSigned<TR::Int64>()/4)
{
if (maxFactorAllowed >= 4)
maxFactorAllowed = 4;
}
else if (entryVal->getLowLong() >= TR::getMinSigned<TR::Int64>()/2)
{
if (maxFactorAllowed >= 2)
maxFactorAllowed = 2;
}
}
if (exitVal->asLongConstraint())
{
if (maxFactorAllowed > 1)
{
if (exitVal->getHighLong() <= TR::getMaxSigned<TR::Int64>()/256)
{
if (maxFactorAllowed >= 256)
maxFactorAllowed = 256;
}
else if (exitVal->getHighLong() <= TR::getMaxSigned<TR::Int64>()/8)
{
if (maxFactorAllowed >= 8)
maxFactorAllowed = 8;
}
else if (exitVal->getHighLong() <= TR::getMaxSigned<TR::Int64>()/4)
{
if (maxFactorAllowed >= 4)
maxFactorAllowed = 4;
}
else if (exitVal->getHighLong() <= TR::getMaxSigned<TR::Int64>()/2)
{
if (maxFactorAllowed >= 2)
maxFactorAllowed = 2;
}
if (exitVal->getLowLong() >= TR::getMinSigned<TR::Int64>()/256)
{
if (maxFactorAllowed >= 256)
maxFactorAllowed = 256;
}
else if (exitVal->getLowLong() >= TR::getMinSigned<TR::Int64>()/8)
{
if (maxFactorAllowed >= 8)
maxFactorAllowed = 8;
}
else if (exitVal->getLowLong() >= TR::getMinSigned<TR::Int64>()/4)
{
if (maxFactorAllowed >= 4)
maxFactorAllowed = 4;
}
else if (exitVal->getLowLong() >= TR::getMinSigned<TR::Int64>()/2)
{
if (maxFactorAllowed >= 2)
maxFactorAllowed = 2;
}
}
}
if (maxFactorAllowed > 1)
{
loopTestCanBeChangedIfRequired = true;
}
}
}
}
bool exitValueNeeded = false;
//if (_cannotBeEliminated->get(nextInductionVariableNumber))
{
List<TR::Block> exitBlocks(trMemory());
ListIterator<TR::CFGEdge> ei(&loopStructure->asRegion()->getExitEdges());
for (TR::CFGEdge *edge = ei.getCurrent(); edge != NULL; edge = ei.getNext())
{
TR_StructureSubGraphNode *target = edge->getTo()->asStructureSubGraphNode();
TR::CFGNode *cfgNode = comp()->getFlowGraph()->getFirstNode();
while (cfgNode)
{
// dumpOptDetails(comp(), "Target %d cfgNode %d\n", target->getNumber(), cfgNode->getNumber());
if (cfgNode->getNumber() == target->getNumber())
{
exitBlocks.add(cfgNode->asBlock());
break;
}
cfgNode = cfgNode->getNext();
}
}
ListIterator<TR::Block> bi(&exitBlocks);
vcount_t visitCount = comp()->incVisitCount();
for (TR::Block *exitBlock = bi.getCurrent(); exitBlock != NULL; exitBlock = bi.getNext())
{
bool seenStore = false;
exitValueNeeded = unchangedValueNeededIn(exitBlock, nextInductionVariableNumber, seenStore);
//dumpOptDetails(comp(), "Exit block is %d and exitValueNeeded %d\n", exitBlock->getNumber(), exitValueNeeded);
if (!exitValueNeeded &&
!seenStore)
{
TR::Block *next;
for (auto edge = exitBlock->getSuccessors().begin(); edge != exitBlock->getSuccessors().end(); ++edge)
{
next = toBlock((*edge)->getTo());
exitValueNeeded = unchangedValueNeededIn(next, nextInductionVariableNumber, seenStore);
//dumpOptDetails(comp(), "Exit succ block is %d and exitValueNeeded %d\n", next->getNumber(), exitValueNeeded);
if (exitValueNeeded)
break;
}
}
if (exitValueNeeded)
break;
}
}
//TODO: get rid of this cannotBeEliminated test for PPC and
// do not change the loop test to use the new variable
//
if (storeInRequiredForm &&
(!_registersScarce ||
(!exitValueNeeded &&
(!_cannotBeEliminated->get(nextInductionVariableNumber) ||
(isLoopTestInductionVariable && loopTestCanBeChangedIfRequired)))) &&
performTransformation(comp(), "%s Replacing uses of induction var %d in loop %d\n", OPT_DETAILS, nextInductionVariableNumber, loopStructure->getNumber()))
{
inductionVarSymRef = symRefTab->getSymRef(_loopDrivingInductionVar);
_startExpressionForThisInductionVariable = _nextExpression;
comp()->incVisitCount();
// This calls examineTreeForInductionVariableUse
if (replaceAllInductionVariableComputations(loopInvariantBlock->getBlock(), loopStructure, &newSymbolReference, inductionVarSymRef))
{
int32_t k=_startExpressionForThisInductionVariable;
int32_t bestCandidate = k;
int64_t highestFactor = -1;
TR_InductionVariable *strideForPIV = NULL;
for (;k<_nextExpression;k++)
{
newSymbolReference = symRefTab->getSymRef((int32_t)_linearEquations[k][1]);
TR_RegisterCandidate *newInductionCandidate = comp()->getGlobalRegisterCandidates()->findOrCreate(newSymbolReference);
//
// Add the derived induction variable as a global register candidate
// within the loop
//
if (performTransformation(comp(), "%s Adding auto %d (created for striding) as a global register "
"candidate in loop %d\n", OPT_DETAILS,
newInductionCandidate->getSymbolReference()->getReferenceNumber(), loopStructure->getNumber()))
newInductionCandidate->addAllBlocksInStructure(loopStructure, comp(), trace()? "strider auto":NULL);
// Add the initialization of the derived induction variable before the
// loop is entered
//
TR::Node *placeHolderNode = placeInitializationTreeInLoopInvariantBlock(loopInvariantBlock,
inductionVarSymRef, newSymbolReference, k, symRefTab);
// Add the increment/decrement of the derived induction variable immediately
// after the increment/decrement of the original induction variable
//
TR::Node *storeNode = placeNewInductionVariableIncrementTree(loopInvariantBlock, inductionVarSymRef,
newSymbolReference, k, symRefTab, placeHolderNode, loopTestHasSymRef);
// Do not consider linear equations with
// non-const multiplicative term for loop induction variable
if (!isMulTermConst(k)) continue;
int64_t mulConst = getMulTermConst(k);
if (mulConst < 0)
{
if ((-1*mulConst > highestFactor) ||
((-1*mulConst == highestFactor) &&
(_linearEquations[k][4] > -1)))
{
bestCandidate = k;
highestFactor = -1*mulConst;
storeOfDerivedInductionVariable = storeNode;
}
}
else
{
if ((mulConst > highestFactor) ||
((mulConst == highestFactor) &&
(_linearEquations[k][4] > -1)))
{
bestCandidate = k;
highestFactor = mulConst;
storeOfDerivedInductionVariable = storeNode;
}
}
// todo: create IV even if non-const additive term? need to check loop-invariance and
// known constraints
if (!isAdditiveTermConst(k))
continue;
if (newSymbolReference->getSymbol()->getDataType() != TR::Address)
{
TR_InductionVariable *v = loopStructure->asRegion()->findMatchingIV(inductionVarSymRef);
if (v)
{
TR::VPConstraint *entryVal = v->getEntry();
TR::VPConstraint *exitVal = v->getExit();
TR::VPConstraint *incr = v->getIncr();
TR::VPConstraint *newEntryVal = NULL;
TR::VPConstraint *newExitVal = NULL;
TR::VPConstraint *newIncr = NULL;
if (newSymbolReference->getSymbol()->getType().isInt64())
{
newEntryVal = genVPLongRange(entryVal, mulConst, getAdditiveTermConst(k));
newExitVal = genVPLongRange(exitVal, mulConst, getAdditiveTermConst(k));
newIncr = genVPLongRange(incr, mulConst, 0);
}
else
{
newEntryVal = genVPIntRange(entryVal, mulConst, getAdditiveTermConst(k));
newExitVal = genVPIntRange(exitVal, mulConst, getAdditiveTermConst(k));
newIncr = genVPIntRange(incr, mulConst, 0);
}
TR_InductionVariable *iv = new (trHeapMemory()) TR_InductionVariable(newSymbolReference->getSymbol()->castToRegisterMappedSymbol(),
newEntryVal, newExitVal, newIncr,
_loopTestTree->getNode()->getOpCode().isUnsignedCompare() ? TR_no : TR_yes);
if (bestCandidate == k)
strideForPIV = iv;
loopStructure->asRegion()->addInductionVariable(iv);
}
}
if (trace())
traceMsg(comp(),"Found an induction var chance in %s\n", comp()->signature());
} // for loop over all linear expressions
TR::Node *loopTestNode = _loopTestTree->getNode();
if (isMulTermConst(bestCandidate) &&
isLoopTestInductionVariable &&
highestFactor <= maxFactorAllowed &&
/*
* don't change loop exit test from IV to stride if it's unsafe to do so.
* IE. stride straddles zero(1), test is unsigned inequality.
* To determine (1), we need the range constraints on stride to test
* if it only contains non-negatives or non-positives.
* Reject if constraints are unknown due to non-const additive term.
* */
!(0 && //no-strict IV
loopTestNode->getOpCode().isCompareForOrder() && //unsigned inequality
loopTestNode->getOpCode().isUnsignedCompare() &&
(!isAdditiveTermConst(bestCandidate) || //non-const additive term
!strideForPIV || //no stride iv
// we have stride, but range not strictly non-neg or non-pos.
!(strideForPIV->getEntry()->asLongConstraint() ?
(strideForPIV->getEntry()->getLowLong() >= 0 ||
strideForPIV->getExit()->getHighLong() <= 0) :
(strideForPIV->getEntry()->getLowInt() >= 0 || // int constraint versions
strideForPIV->getExit()->getHighInt() <= 0)))
) &&
performTransformation(comp(),"%sReplacing loop test node in %s\n", OPT_DETAILS, comp()->signature())
)
{
changeLoopCondition(loopInvariantBlock, usingAladd, bestCandidate, storeOfDerivedInductionVariable);
}
}
else
{
TR_RegisterCandidate *inductionCandidate = comp()->getGlobalRegisterCandidates()->findOrCreate(inductionVarSymRef);
if (performTransformation(comp(), "%s Adding auto %d as a global register candidate in loop %d\n", OPT_DETAILS, inductionCandidate->getSymbolReference()->getReferenceNumber(), loopStructure->getNumber()))
inductionCandidate->addAllBlocksInStructure(loopStructure, comp(), trace()?"auto":NULL);
}
}
} // loop over the symbols written once
}
if (!reassociateAndHoistNonPacked())
return 0;
if (trace())
{
traceMsg(comp(),"Found an induction var chance in %s\n", comp()->signature());
}
TR::Block *b = loopInvariantBlock->getBlock();
reassociateAndHoistComputations(b, loopStructure);
TR::Node *byteCodeInfoNode = b->getEntry()->getNode();
TR::TreeTop *placeHolderTree = b->getLastRealTreeTop();
if (!placeHolderTree->getNode()->getOpCode().isBranch())
placeHolderTree = b->getExit();
int32_t j;
for (j=0;j<symRefCount;j++)
{
auto reassociatedAutoSearchResult = _reassociatedAutos->find(j);
TR::SymbolReference *reassociatedAuto = reassociatedAutoSearchResult != _reassociatedAutos->end() ?
reassociatedAutoSearchResult->second : NULL;
if (reassociatedAuto)
{
//dumpOptDetails(comp(), "j = %d reassociated auto = %d (%p)\n", j,
// reassociatedAuto->getReferenceNumber(), reassociatedAuto);
if (trace())
traceMsg(comp(), "Found an reassociated induction var chance in %s\n", comp()->signature());
TR::SymbolReference *origAuto = symRefTab->getSymRef(j);
TR::Node *arrayRefNode;
int32_t hdrSize = (int32_t)TR::Compiler->om.contiguousArrayHeaderSizeInBytes();
if (usingAladd)
{
TR::Node *constantNode = TR::Node::create(byteCodeInfoNode, TR::lconst);
//constantNode->setLongInt(16);
constantNode->setLongInt((int64_t)hdrSize);
arrayRefNode = TR::Node::create(TR::aladd, 2,
TR::Node::createWithSymRef(byteCodeInfoNode,
TR::aload, 0, origAuto), constantNode);
}
else
arrayRefNode = TR::Node::create(TR::aiadd, 2,
TR::Node::createWithSymRef(byteCodeInfoNode, TR::aload, 0, origAuto),
TR::Node::create(byteCodeInfoNode, TR::iconst, 0, hdrSize));
arrayRefNode->setIsInternalPointer(true);
if (!origAuto->getSymbol()->isInternalPointer())
{
arrayRefNode->setPinningArrayPointer(reassociatedAuto->getSymbol()-> \
castToInternalPointerAutoSymbol()->getPinningArrayPointer());
reassociatedAuto->getSymbol()->castToInternalPointerAutoSymbol()-> \
getPinningArrayPointer()->setPinningArrayPointer();
}
else
arrayRefNode->setPinningArrayPointer(origAuto->getSymbol()-> \
castToInternalPointerAutoSymbol()->getPinningArrayPointer());
TR::Node *newStore = TR::Node::createWithSymRef(TR::astore, 1, 1, arrayRefNode, reassociatedAuto);
newStore->setLocalIndex(~0);
TR::TreeTop *newStoreTreeTop = TR::TreeTop::create(comp(), newStore);
placeHolderTree->getPrevTreeTop()->join(newStoreTreeTop);
newStoreTreeTop->join(placeHolderTree);
dumpOptDetails(comp(), "\nO^O INDUCTION VARIABLE ANALYSIS: Induction variable analysis "
"inserted reassociation initialization tree : %p for new symRef #%d\n",
newStoreTreeTop->getNode(), reassociatedAuto->getReferenceNumber());
TR_RegisterCandidate *newInductionCandidate = comp()->getGlobalRegisterCandidates()->findOrCreate(reassociatedAuto);
//
// Add the reassociated auto as a global register candidate
// within the loop
//
if (performTransformation(comp(), "%s Adding auto %d (created for striding) as a "
"global register candidate in loop %d\n", OPT_DETAILS,
newInductionCandidate->getSymbolReference()->getReferenceNumber(), loopStructure->getNumber()))
newInductionCandidate->addAllBlocksInStructure(loopStructure, comp(), trace()?"strider auto":NULL);
}
auto symRefPairSearchResult = _hoistedAutos->find(j);
SymRefPair *symRefPair = symRefPairSearchResult != _hoistedAutos->end() ? symRefPairSearchResult->second : NULL;
if (symRefPair)
{
if (trace())
traceMsg(comp(), "Found an internal pointer hoisting chance in %s\n", comp()->signature());
TR::SymbolReference *origAuto = symRefTab->getSymRef(j);
while (symRefPair)
{
TR::Node *arrayRefNode = NULL;
if (symRefPair->_isConst)
{
int32_t index = symRefPair->_index;
if (usingAladd)
{
TR::Node *constantNode = TR::Node::create(byteCodeInfoNode, TR::lconst);
constantNode->setLongInt((int64_t)index);
arrayRefNode = TR::Node::create(TR::aladd, 2, TR::Node::createWithSymRef(byteCodeInfoNode, TR::aload, 0, origAuto), constantNode);
}