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RegisterCandidate.cpp
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RegisterCandidate.cpp
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/*******************************************************************************
* Copyright (c) 2000, 2021 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
*******************************************************************************/
#ifdef OMRZTPF
#define __TPF_DO_NOT_MAP_ATOE_REMOVE
#endif
#include "optimizer/RegisterCandidate.hpp"
#include <algorithm>
#include <limits.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "codegen/CodeGenerator.hpp"
#include "env/FrontEnd.hpp"
#include "codegen/LinkageConventionsEnum.hpp"
#include "codegen/RegisterConstants.hpp"
#include "compile/Compilation.hpp"
#include "compile/SymbolReferenceTable.hpp"
#include "control/Options.hpp"
#include "control/Options_inlines.hpp"
#include "cs2/bitvectr.h"
#include "cs2/hashtab.h"
#include "cs2/sparsrbit.h"
#include "env/CompilerEnv.hpp"
#include "env/TRMemory.hpp"
#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/RegisterMappedSymbol.hpp"
#include "il/ResolvedMethodSymbol.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/Link.hpp"
#include "infra/List.hpp"
#include "infra/Checklist.hpp"
#include "infra/CfgEdge.hpp"
#include "infra/CfgNode.hpp"
#include "optimizer/Optimizations.hpp"
#include "optimizer/Optimizer.hpp"
#include "optimizer/Structure.hpp"
#include "ras/Debug.hpp"
//TODO:GRA: if we are going to have two versions of GRA one with Meta Data and one without then we can do someting here
// for different compilation level then we can have two version of this, one using CPIndex and one (i.e. with MetaData)
// using getReferenceNumber
#define GET_INDEX_FOR_CANDIDATE_FOR_SYMREF(S) (S)->getReferenceNumber()
#define CANDIDATE_FOR_SYMREF_SIZE (comp()->getSymRefCount()+1)
#define OPT_DETAILS "O^O GLOBAL REGISTER ASSIGNER: "
//static TR_BitVector *blocksVisited = NULL;
// Duplicated in GlobalRegisterAllocator.cpp. TODO try and factor this out
#define keepAllStores false
TR::GlobalSet::GlobalSet(TR::Compilation * comp, TR::Region ®ion)
:_region(region),
_blocksPerAuto((RefMapComparator()),(RefMapAllocator(region))),
_EMPTY(region),
_collected(false),
_comp(comp)
{
}
void TR::GlobalSet::collectBlocks()
{
TR::StackMemoryRegion stackMemoryRegion(*_comp->trMemory());
TR_BitVector references(0, _comp->trMemory(), stackAlloc);
TR_BitVectorIterator bvi(references);
TR::NodeChecklist visited(_comp);
for (TR::CFGNode *node = _comp->getFlowGraph()->getFirstNode(); node; node = node->getNext())
{
TR::Block *block = toBlock(node);
if (!block)
continue;
// Collect all autos/parms used in this block
references.empty();
visited.remove(visited);
for (TR::TreeTop * tt = block->getEntry(); tt && tt != block->getExit(); tt = tt->getNextTreeTop())
collectReferencedAutoSymRefs(tt->getNode(), references, visited);
// Set this block as referencing the collected autos/params
// Also set any blocks that extend this one
bvi.setBitVector(references);
while (bvi.hasMoreElements())
{
uint32_t symRefNum = bvi.getNextElement();
auto lookup = _blocksPerAuto.find(symRefNum);
if (lookup != _blocksPerAuto.end())
lookup->second->set(block->getNumber());
else
{
TR_BitVector *blocks = new (_region) TR_BitVector(_region);
blocks->set(block->getNumber());
_blocksPerAuto[symRefNum] = blocks;
}
}
}
_collected = true;
}
void TR::GlobalSet::collectReferencedAutoSymRefs(TR::Node *node, TR_BitVector &referencedAutoSymRefs, TR::NodeChecklist &visited)
{
if (visited.contains(node))
return;
visited.add(node);
if (node->getOpCode().hasSymbolReference() && node->getSymbolReference()->getSymbol()->isAutoOrParm())
referencedAutoSymRefs.set(node->getSymbolReference()->getReferenceNumber());
for (int32_t i = 0; i < node->getNumChildren(); ++i)
collectReferencedAutoSymRefs(node->getChild(i), referencedAutoSymRefs, visited);
}
// Duplicated in GlobalRegisterAllocator.cpp. TODO try and factor this out
static bool dontAssignInColdBlocks(TR::Compilation *comp) { return comp->getMethodHotness() >= hot; }
// Duplicated in GlobalRegisterAllocator.cpp. TODO try and factor this out
// For both switch/table instructions and igoto instructions, the
// same sort of processing has to be done for each successor block.
// These classes are meant to allow that work to be independent of
// the way that the successor blocks are actually identified.
int32_t TR_RegisterCandidates::_candidateTypeWeights[TR_NumRegisterCandidateTypes] =
{
1, // TR_InductionVariableCandidate
1 // 10 // TR_PRECandidate
};
TR_RegisterCandidate::TR_RegisterCandidate(TR::SymbolReference * sr, TR::Region &r)
: _symRef(sr), _splitSymRef(NULL), _restoreSymRef(NULL), _lowRegNumber(-1), _highRegNumber(-1),
_liveOnEntry(), _liveOnExit(), _originalLiveOnEntry(),
_reprioritized(0),
_blocks(r),
_loopExitBlocks(r),
_stores(r),
_loopsWithHoles(r),
_mostRecentValue(NULL),
_lastLoad(NULL)
{
}
TR::DataType
TR_RegisterCandidate::getType()
{
return getSymbol()->getType();
}
TR::DataType
TR_RegisterCandidate::getDataType()
{
TR::Symbol *rcSymbol = getSymbol();
TR::DataType dtype = rcSymbol->getDataType();
return dtype;
}
TR_RegisterKinds
TR_RegisterCandidate::getRegisterKinds()
{
TR::DataType dt = getDataType();
if(dt == TR::Float
|| dt == TR::Double
)
return TR_FPR;
else if (dt.isVector())
return TR_VRF;
else
return TR_GPR;
}
void TR_RegisterCandidate::addAllBlocksInStructure(TR_Structure *structure, TR::Compilation *comp, const char *description, vcount_t count, bool recursiveCall)
{
if (!recursiveCall)
count = comp->incVisitCount();
if (structure->asBlock() != NULL)
{
TR_BlockStructure *blockStructure = structure->asBlock();
TR::Block *block = blockStructure->getBlock();
addBlock(block, 0);
if (description)
traceMsg(comp, "\nAdded %s #%d (symRef %p) as global reg candidate in block_%d\n", description, getSymbolReference()->getReferenceNumber(), getSymbolReference(), block->getNumber());
}
else
{
TR_RegionStructure *regionStructure = structure->asRegion();
TR_StructureSubGraphNode *node;
TR_RegionStructure::Cursor si(*regionStructure);
for (node = si.getCurrent(); node != NULL; node = si.getNext())
addAllBlocksInStructure(node->getStructure(), comp, description, count, true);
}
}
TR_RegisterCandidates::TR_RegisterCandidates(TR::Compilation *comp)
: _compilation(comp), _trMemory(comp->trMemory()), _candidateRegion(_trMemory->heapMemoryRegion()),
_referencedAutoSymRefsInBlock(NULL)
{
_candidateForSymRefs = 0;
}
TR_RegisterCandidate *TR_RegisterCandidates::newCandidate(TR::SymbolReference *ref) {
return new (_candidateRegion) TR_RegisterCandidate(ref, _candidateRegion);
}
TR_RegisterCandidate *
TR_RegisterCandidates::findOrCreate(TR::SymbolReference * symRef)
{
TR_RegisterCandidate * rc;
if ((rc = find(symRef)))
{
if (_candidateForSymRefs)
{
(*_candidateForSymRefs)[GET_INDEX_FOR_CANDIDATE_FOR_SYMREF(symRef)] = rc;
}
return rc;
}
_candidates.add(rc = newCandidate(symRef));
if (_candidateForSymRefs)
(*_candidateForSymRefs)[GET_INDEX_FOR_CANDIDATE_FOR_SYMREF(symRef)] = rc;
TR_ASSERT(comp()->cg()->considerTypeForGRA(symRef),"should create a registerCandidate for symRef #%d with datatype %s\n",symRef->getReferenceNumber(),rc->getDataType().toString());
return rc;
}
TR_RegisterCandidate *
TR_RegisterCandidates::find(TR::SymbolReference * symRef)
{
if (symRef->getSymbol()->isAutoOrParm())
{
TR_RegisterCandidate* rc= (_candidateForSymRefs) ? (*_candidateForSymRefs)[GET_INDEX_FOR_CANDIDATE_FOR_SYMREF(symRef)] : NULL;
// two symrefs can point to same symbols so it is possible that we have an rc for symref->getSymbol but not have it added to the cache
if(rc==NULL)
{
rc = find(symRef->getSymbol());
if (_candidateForSymRefs)
(*_candidateForSymRefs)[GET_INDEX_FOR_CANDIDATE_FOR_SYMREF(symRef)] = rc;
}
return rc;
}
else
return NULL;
}
TR_RegisterCandidate *
TR_RegisterCandidates::find(TR::Symbol* sym)
{
TR_RegisterCandidate * rc;
for (rc = _candidates.getFirst(); rc; rc = rc->getNext())
if (rc->getSymbolReference()->getSymbol() == sym)
return rc;
return NULL;
}
bool
TR_RegisterCandidate::find(TR::Block * b)
{
return _blocks.find(b->getNumber());
}
void
TR_RegisterCandidate::addBlock(TR::Block * block, int32_t numberOfLoadsAndStores)
{
_blocks.incNumberOfLoadsAndStores(block->getNumber(), numberOfLoadsAndStores);
}
int32_t
TR_RegisterCandidate::removeBlock(TR::Block * block)
{
if (find(block))
{
int32_t numLoadsAndStores = _blocks.getNumberOfLoadsAndStores(block->getNumber());
_blocks.removeBlock(block->getNumber());
return numLoadsAndStores;
}
return 0;
}
void TR_RegisterCandidate::removeLoopExitBlock(TR::Block *b)
{
_loopExitBlocks.remove(b);
}
void TR_RegisterCandidate::addLoopExitBlock(TR::Block *b)
{
if (!_loopExitBlocks.find(b))
_loopExitBlocks.add(b);
}
bool TR_RegisterCandidate::hasLoopExitBlock(TR::Block * b)
{
return (_loopExitBlocks.find(b) != 0);
}
int32_t
TR_RegisterCandidate::countNumberOfLoadsAndStoresInBlocks(List<TR::Block> *blocksInLoop)
{
int32_t numLoadsAndStores = 0;
ListIterator<TR::Block> blocksIt(blocksInLoop);
TR::Block *nextBlock;
for (nextBlock = blocksIt.getCurrent(); nextBlock; nextBlock=blocksIt.getNext())
{
numLoadsAndStores += _blocks.getNumberOfLoadsAndStores(nextBlock->getNumber());
}
return numLoadsAndStores;
}
#ifdef TRIM_ASSIGNED_CANDIDATES
// The following are methods for maintaining info about number of candidate's loads
// and stores per loop (vs. per block)
TR_RegisterCandidate::LoopInfo *
TR_RegisterCandidate::find(TR_Structure * l)
{
for (LoopInfo * li = _loops.getFirst(); li; li = li->getNext())
if (li->_loop == l)
return li;
return 0;
}
void
TR_RegisterCandidate::printLoopInfo(TR::Compilation *comp)
{
for (LoopInfo * li = _loops.getFirst(); li; li = li->getNext())
{
traceMsg(comp, "Candidate #%d has %d loads and stores in loop %d\n",
getSymbolReference()->getReferenceNumber(),
li->_numberOfLoadsAndStores,
li->_loop->getNumber());
}
}
void
TR_RegisterCandidate::addLoop(TR_Structure * loop, int32_t numberOfLoadsAndStores, TR_Memory * m)
{
LoopInfo * li = find(loop);
if (li)
li->_numberOfLoadsAndStores += numberOfLoadsAndStores;
else
_loops.add(new (m->trHeapMemory()) LoopInfo(loop, numberOfLoadsAndStores));
}
// Reduce block info into loop info by counting loads and stores in loops
void
TR_RegisterCandidate::countNumberOfLoadsAndStoresInLoops(TR_Memory * m)
{
for (BlockInfo * bi = _blocks.getFirst(); bi; bi = bi->getNext())
{
TR_BlockStructure *blockStructure = bi->_block->getStructureOf();
if (blockStructure)
{
TR_Structure *containingLoop = blockStructure->getContainingLoop();
if (containingLoop)
addLoop(containingLoop, bi->_numberOfLoadsAndStores, m);
}
}
}
int32_t
TR_RegisterCandidate::getNumberOfLoadsAndStoresInLoop(TR_Structure *loop)
{
LoopInfo * li = find(loop);
if (li)
return li->_numberOfLoadsAndStores;
else
return 0;
}
bool isInnerLoop(TR::Compilation *comp, TR_Structure *loop)
{
List<TR::Block> blocksInLoop(comp->trMemory());
loop->getBlocks(&blocksInLoop);
ListIterator<TR::Block> blocksIt(&blocksInLoop);
TR::Block *nextBlock;
blocksIt.reset();
for (nextBlock = blocksIt.getCurrent(); nextBlock; nextBlock=blocksIt.getNext())
{
if (nextBlock->getStructureOf()->getContainingLoop() != loop)
return false;
}
return true;
}
void
TR_RegisterCandidate::removeAssignedCandidateFromLoop(TR::Compilation *comp, TR_Structure *loop, int32_t regNum, TR_BitVector *liveOnEntryUsage, TR_BitVector *liveOnExitUsage, bool trace)
{
List<TR::Block> blocksInLoop(comp->trMemory());
loop->getBlocks(&blocksInLoop);
ListIterator<TR::Block> blocksIt(&blocksInLoop);
TR::Block *nextBlock;
blocksIt.reset();
for (nextBlock = blocksIt.getCurrent(); nextBlock; nextBlock=blocksIt.getNext())
{
int32_t blockNumber = nextBlock->getNumber();
_liveOnEntry.reset(blockNumber);
_liveOnExit.reset(blockNumber);
liveOnEntryUsage->reset(blockNumber);
liveOnExitUsage->reset(blockNumber);
if (trace)
traceMsg(comp, "Removed candidate #%d from block_%d entry and exit\n",
getSymbolReference()->getReferenceNumber(), blockNumber);
nextBlock->getGlobalRegisters(comp)[regNum].setRegisterCandidateOnEntry(NULL);
nextBlock->getGlobalRegisters(comp)[regNum].setRegisterCandidateOnExit(NULL);
// handle predecessors
for (auto pred = nextBlock->getPredecessors().begin(); pred != nextBlock->getPredecessors().end(); ++pred)
{
TR::Block *block = toBlock((*pred)->getFrom());
_liveOnExit.reset(block->getNumber());
liveOnExitUsage->reset(block->getNumber());
block->getGlobalRegisters(comp)[regNum].setRegisterCandidateOnExit(NULL);
}
// handle successors
for (auto succ = nextBlock->getSuccessors().begin(); succ != nextBlock->getSuccessors().end(); ++succ)
{
TR::Block *block = toBlock((*succ)->getTo());
_liveOnEntry.reset(block->getNumber());
liveOnEntryUsage->reset(block->getNumber());
block->getGlobalRegisters(comp)[regNum].setRegisterCandidateOnEntry(NULL);
}
}
}
#endif
bool
TR_RegisterCandidate::symbolIsLive(TR::Block * block)
{
TR_BitVector * liveLocals = block->getLiveLocals();
if (!liveLocals)
return true; // can be a new block
if (!getSymbol()->getAutoSymbol())
{
return true;
}
if (!getSymbol()->isAutoOrParm())
{
return true;
}
TR::RegisterMappedSymbol * regSym = getSymbol()->getRegisterMappedSymbol();
return liveLocals->get(regSym->getLiveLocalIndex()) != 0;
}
bool findStoreNearEndOfBlock(TR::Block *block, TR::SymbolReference *ref)
{
TR::Node * node = block->getLastRealTreeTop()->getNode();
if (node->getOpCode().isStore())
return (node->getSymbolReference() == ref);
else if (block->getLastRealTreeTop()->getPrevTreeTop())
{
node = block->getLastRealTreeTop()->getPrevTreeTop()->getNode();
return (node->getOpCode().isStore() && (node->getSymbolReference()) == ref);
}
return false;
}
bool findLoad(TR::Node *node, TR::SymbolReference *ref)
{
if (node->getOpCode().isLoad() &&
node->getSymbolReference() == ref)
return true;
return false; // simplify for now to avoid timeout in SPEC
for (int i = 0; i < node->getNumChildren(); i++)
{
if (findLoad(node->getChild(i), ref))
return true;
}
return false;
}
bool findLoadNearStartOfBlock(TR::Block *block, TR::SymbolReference *ref)
{
// vcount_t visitCount = comp->incVisitCount();
return findLoad(block->getFirstRealTreeTop()->getNode(), ref);
}
bool TR_RegisterCandidates::aliasesPreventAllocation(TR::Compilation *comp, TR::SymbolReference *symRef)
{
if (!symRef->getSymbol()->isAutoOrParm() && !(comp->target().cpu.isZ() && comp->target().isLinux()) ) return true;
TR::SparseBitVector use_def_aliases(comp->allocator());
symRef->getUseDefAliases(false).getAliases(use_def_aliases);
if (!use_def_aliases.IsZero())
{
use_def_aliases[symRef->getReferenceNumber()] = false;
if (!use_def_aliases.IsZero())
return true;
}
return false;
}
void
TR_RegisterCandidate::setWeight(TR::Block * * blocks, int32_t *blockStructureWeight, TR::Compilation *comp,
TR_Array<int32_t> & blockGPRCount,
TR_Array<int32_t> & blockFPRCount,
TR_Array<int32_t> & blockVRFCount,
TR_BitVector *referencedBlocks, TR_Array<TR::Block *>& startOfExtendedBBForBB,
TR_BitVector &firstBlocks,
TR_BitVector &isExtensionOfPreviousBlock)
{
LexicalTimer t("setWeight", comp->phaseTimer());
TR::CFG * cfg = comp->getFlowGraph();
int32_t numberOfBlocks = cfg->getNextNodeNumber();
_liveOnEntry.init(numberOfBlocks, comp->trMemory(), stackAlloc, growable);
_liveOnExit.init(numberOfBlocks, comp->trMemory(), stackAlloc, growable);
_originalLiveOnEntry.init(numberOfBlocks, comp->trMemory(), stackAlloc, growable);
TR::CodeGenerator * cg = comp->cg();
BlockInfo::iterator itr = _blocks.getIterator();
while (itr.hasMoreElements())
{
int32_t blockNumber = itr.getNextElement();
TR_ASSERT(blockNumber < cfg->getNextNodeNumber(), "Overflow on candidate BB numbers");
TR::Block * b = blocks[blockNumber];
if (!b) continue;
TR_ASSERT(blockNumber == b->getNumber(),"blocks[x]->getNumber() != x");
TR_ASSERT((blockNumber < cfg->getNextNodeNumber()) && (blocks[blockNumber] == b),"blockNumber is wrong");
int32_t blockWeight = _blocks.getNumberOfLoadsAndStores(blockNumber);
bool firstBlock = firstBlocks.isSet(blockNumber);
if ((firstBlock && isAllBlocks() && cg->getSupportsGlRegDepOnFirstBlock()) ||
(!firstBlock && (((blockWeight == 0) && hasLoopExitBlock(b)) || symbolIsLive(b))))
_liveOnEntry.set(blockNumber);
TR_BlockStructure * blockStructure = b->getStructureOf();
int32_t blockFreq = 1;
if (blockStructure)
{
blockFreq = blockStructureWeight[blockNumber];
}
TR_ASSERT(comp->getOptimizer()->cachedExtendedBBInfoValid(), "Incorrect value in _startOfExtendedBBForBB");
TR::Block * extendedBlock = startOfExtendedBBForBB[blockNumber];
int32_t extendedBlockFreq = 1;
TR_BlockStructure *extendedBlockStructure = extendedBlock->getStructureOf();
if (extendedBlockStructure)
{
extendedBlockFreq = blockStructureWeight[extendedBlock->getNumber()];
}
// We should not mark a candidate as being referenced in the extended block if the
// only references to it are in the portion of the extended block that is outside a loop
// This is important as we cannot recognize that a candidate is not referenced at all in a loop
// otherwise. We see a 'false' use in the extended basic block that started inside the loop because
// of the portion of the extended basic block outside the loop.
//
if (extendedBlockFreq <= blockFreq)
{
if ((uint32_t)blockWeight > _blocks.getNumberOfLoadsAndStores(extendedBlock->getNumber()))
_blocks.setNumberOfLoadsAndStores(extendedBlock->getNumber(), blockWeight);
}
}
_originalLiveOnEntry |= _liveOnEntry;
processLiveOnEntryBlocks(blocks, blockStructureWeight, comp,blockGPRCount,blockFPRCount, blockVRFCount, referencedBlocks, startOfExtendedBBForBB);
}
void
TR_RegisterCandidate::recalculateWeight(TR::Block * * blocks, int32_t *blockStructureWeight, TR::Compilation *comp,
TR_Array<int32_t> & blockGPRCount,
TR_Array<int32_t> & blockFPRCount,
TR_Array<int32_t> & blockVRFCount,
TR_BitVector *referencedBlocks, TR_Array<TR::Block *>& startOfExtendedBBForBB)
{
getBlocksLiveOnExit().empty();
_originalLiveOnEntry = _liveOnEntry;
processLiveOnEntryBlocks(blocks, blockStructureWeight, comp,blockGPRCount,blockFPRCount, blockVRFCount, referencedBlocks, startOfExtendedBBForBB);
}
// Look at exit live count of predecessor, and return true if there is too much
// register pressue
bool
TR_RegisterCandidate::prevBlockTooRegisterConstrained(TR::Compilation *comp, TR::Block *block,
TR_Array<int32_t> & blockGPRCount,
TR_Array<int32_t> & blockFPRCount,
TR_Array<int32_t> & blockVRFCount)
{
static char * doit = feGetEnv("TR_SkipIfPrevBlockConstrained");
int32_t blockNum = block->getNumber();
if (doit != NULL) return true;
if (_liveOnEntry.get(blockNum))
{
int32_t gprCount=0,fprCount=0,vrfCount=0;
gprCount = blockGPRCount[blockNum];
fprCount = blockFPRCount[blockNum];
vrfCount = blockVRFCount[blockNum];
//printf("block_%d: gpr:%d fpr:%d vrf:%d\n",blockNum,gprCount,fprCount,vrfCount);
for (auto e = block->getPredecessors().begin(); e != block->getPredecessors().end(); ++e)
{
TR::Block * pred = toBlock((*e)->getFrom());
if (pred == comp->getFlowGraph()->getStart())
continue;
TR::Node * node = pred->getLastRealTreeTop()->getNode();
//printf("looking at block_%d's previous node %p\n",blockNum,node);
int32_t maxGPRs= comp->cg()->getMaximumNumberOfGPRsAllowedAcrossEdge(pred);
int32_t maxFPRs= comp->cg()->getMaximumNumberOfFPRsAllowedAcrossEdge(node);
int32_t maxVRFs= comp->cg()->getMaximumNumberOfVRFsAllowedAcrossEdge(node);
//dumpOptDetails(comp, " pred %d actual gprs %d max gprs %d ", pred->getNumber(), gprCount, maxGPRs);
if (maxFPRs <= fprCount || maxGPRs <= gprCount || maxVRFs <= vrfCount) return true;
}
}
//printf(".....no constraints\n");
return false;
}
bool TR_RegisterCandidate::rcNeeds2Regs(TR::Compilation *comp)
{
if(getType().isAggregate())
{
if ( (comp->target().is32Bit() && !comp->cg()->use64BitRegsOn32Bit() && getSymbol()->getSize() > 4) || (getSymbol()->getSize() > 8 ) )
return true;
else
return false;
}
else
return ((getType().isInt64() && comp->target().is32Bit() && !comp->cg()->use64BitRegsOn32Bit())
);
}
bool
TR_RegisterCandidate::hasSameGlobalRegisterNumberAs(TR::Node *node, TR::Compilation *comp)
{
if (node->requiresRegisterPair(comp))
return (getLowGlobalRegisterNumber() == node->getLowGlobalRegisterNumber())
&& (getHighGlobalRegisterNumber() == node->getHighGlobalRegisterNumber());
else
return getGlobalRegisterNumber() == node->getGlobalRegisterNumber();
}
void
TR_RegisterCandidate::processLiveOnEntryBlocks(TR::Block * * blocks, int32_t *blockStructureWeight, TR::Compilation *comp,
TR_Array<int32_t> & blockGPRCount,
TR_Array<int32_t> & blockFPRCount,
TR_Array<int32_t> & blockVRFCount,
TR_BitVector *referencedBlocks,
TR_Array<TR::Block *>& startOfExtendedBBForBB, bool callToRemoveUnusedLoops)
{
LexicalTimer t("processLiveOnEntryBlocks", comp->phaseTimer());
TR::SymbolReference *symRef = getSymbolReference();
TR::Symbol * sym = getSymbolReference()->getSymbol();
bool trace = comp->getOptions()->trace(OMR::tacticalGlobalRegisterAllocator);
bool removeUnusedLoops = callToRemoveUnusedLoops;
bool useProfilingFrequencies = comp->getUsesBlockFrequencyInGRA();
double freqRatio;
if(useProfilingFrequencies)
freqRatio = 0.7;
else
freqRatio = 1.0;
if (comp->cg()->areAssignableGPRsScarce())
removeUnusedLoops = true;
if (trace)
dumpOptDetails(comp, "\nWeighing candidate #%d\n", getSymbolReference()->getReferenceNumber());
// If the candidate is marked to be live on entry but is not live on
// entry in any of its predecessors and is not referenced in any of its
// predecessor then remove the block from the _liveOnEntry bitVector
//
referencedBlocks->empty();
vcount_t visitCount = comp->incVisitCount();
TR_BitVectorIterator bvi;
bool lookForBlocksToRemove = !isAllBlocks();
// TODO take this all out
// used for MetaData that are live on entry in blocks, just to mark that they can escape via return but there is no real loads
// so we do not want such live on entry blocks to contribute to weigh of the candidate
// TR_BitVector *ignoreLiveOnEntryBlocks = new (comp->trHeapMemory()) TR_BitVector(comp->getFlowGraph()->getNextNodeNumber(), comp->trMemory());
while (lookForBlocksToRemove)
{
lookForBlocksToRemove = false;
bvi.setBitVector(_liveOnEntry);
while (bvi.hasMoreElements())
{
int32_t blockNumber = bvi.getNextElement();
if (trace)
dumpOptDetails(comp, "Examining original live-on-entry block_%d with loads and stores = %d\n", blockNumber, _blocks.getNumberOfLoadsAndStores(blockNumber));
TR::Block * block = blocks[blockNumber];
bool referencedInPred = false;
for (auto e = block->getPredecessors().begin(); e != block->getPredecessors().end(); ++e)
{
TR_ASSERT(comp->getOptimizer()->cachedExtendedBBInfoValid(), "Incorrect value in _startOfExtendedBBForBB");
if (_liveOnEntry.get(startOfExtendedBBForBB[toBlock((*e)->getFrom())->getNumber()]->getNumber()))
//if (_liveOnEntry.get(toBlock(e->getFrom())->getNumber()))
{ referencedInPred = true; break; }
}
if (!referencedInPred)
for (auto e = block->getPredecessors().begin(); e != block->getPredecessors().end(); ++e)
//if (toBlock(e->getFrom())->startOfExtendedBlock()->findFirstReference(sym, true))
{
TR::Block *predBlock = toBlock((*e)->getFrom());
TR_ASSERT(comp->getOptimizer()->cachedExtendedBBInfoValid(), "Incorrect value in _startOfExtendedBBForBB");
TR::Block *parentPredBlock = startOfExtendedBBForBB[predBlock->getNumber()];
while (parentPredBlock)
{
if (parentPredBlock->getVisitCount() < visitCount)
{
parentPredBlock->setVisitCount(visitCount);
if (parentPredBlock->findFirstReference(sym, visitCount))
{referencedBlocks->set(parentPredBlock->getNumber()); referencedInPred = true; break;}
}
else
{
if (referencedBlocks->get(parentPredBlock->getNumber()))
{
referencedInPred = true;
break;
}
}
// Fixed by Nakaike
// if (predBlock && !predBlock->isExtensionOfPreviousBlock())
if (parentPredBlock == predBlock ||
(parentPredBlock->getNextBlock() && ( parentPredBlock->getNextBlock() == block || !parentPredBlock->getNextBlock()->isExtensionOfPreviousBlock())))
break;
parentPredBlock = parentPredBlock->getNextBlock();
}
if (referencedInPred)
break;
}
if (!referencedInPred)
{
if (trace)
dumpOptDetails(comp, "Not referenced in pred, re-setting block_%d \n", blockNumber);
_liveOnEntry.reset(blockNumber);
lookForBlocksToRemove = true;
}
}
}
lookForBlocksToRemove = true;
// If the number of loads and stores for a block is 0 and the candidate
// is not live on exit then remove the block from the _liveOnEntry bitVector
//
if (lookForBlocksToRemove && trace)
traceMsg(comp, "Trim live ranges upward:\n");
while (lookForBlocksToRemove)
{
lookForBlocksToRemove = false;
bvi.setBitVector(_liveOnEntry);
while (bvi.hasMoreElements())
{
int32_t blockNumber = bvi.getNextElement();
if (trace)
traceMsg(comp, "\tExamining live-on-entry block_%d with loads and stores = %d\n", blockNumber, _blocks.getNumberOfLoadsAndStores(blockNumber));
if (_blocks.getNumberOfLoadsAndStores(blockNumber) == 0)
{
TR::Block * block = blocks[blockNumber];
bool liveOnExit = false;
for (auto succ = block->getSuccessors().begin(); succ != block->getSuccessors().end(); ++succ)
if (_liveOnEntry.get((*succ)->getTo()->getNumber()))
{ liveOnExit = true; break; }
if (!liveOnExit && block->isCold())
{
for (auto pred = block->getPredecessors().begin(); pred != block->getPredecessors().end(); ++pred)
if (!(*pred)->getFrom()->asBlock()->isCold())
{
liveOnExit = true;
break;
}
}
if (!liveOnExit)
{
if (trace)
traceMsg(comp, "\tNot referenced and not live on exit, re-setting block %d \n", blockNumber);
_liveOnEntry.reset(blockNumber);
lookForBlocksToRemove = true;
}
}
}
}
// Calculate the max frequency of any block as per structure
// (one could use some profiling here too)
//
int32_t maxFrequency = 1;
bvi.setBitVector(_liveOnEntry);
while (bvi.hasMoreElements())
{
int32_t blockNumber = bvi.getNextElement();
if (trace)
dumpOptDetails(comp, "Examining live-on-entry block_%d with loads and stores = %d to find maxFrequency\n", blockNumber, _blocks.getNumberOfLoadsAndStores(blockNumber));
TR::Block * block = blocks[blockNumber];
TR_BlockStructure *blockStructure = block->getStructureOf();
int32_t blockWeight = 1;
if (blockStructure &&
(!dontAssignInColdBlocks(comp) || !block->isCold()))
{
blockWeight = blockStructureWeight[block->getNumber()];
// blockStructure->calculateFrequencyOfExecution(&blockWeight);
if (blockWeight > maxFrequency)
maxFrequency = blockWeight;
}
}
int32_t currMaxFrequency = maxFrequency;
if (!getLoopsWithHoles().isEmpty())
removeUnusedLoops = true; // try to remove even if weight is not negative yet
// For every loop nesting depth, figure out how many blocks
// really use the candidate; discard blocks which don't use the candidate
// iff the containing loop does not use the candidate at all. Basically
// the entire loop will be discarded from the blocks list for the
// candidate if the loop does not use the candidate.
//
TR_BitVector *resetLiveOnEntry = new (comp->trHeapMemory()) TR_BitVector(comp->getFlowGraph()->getNextNodeNumber(), comp->trMemory()); // Added by Nakaike
TR_BitVector *resetLiveOnExit = new (comp->trHeapMemory()) TR_BitVector(comp->getFlowGraph()->getNextNodeNumber(), comp->trMemory()); // Added by Nakaike
if ((maxFrequency > 1) &&
removeUnusedLoops)
{
lookForBlocksToRemove = true;
int32_t frequency = 1;
if (comp->getMethodHotness() <= warm &&
getLoopsWithHoles().isEmpty())
frequency = maxFrequency; // to save compile time
while (lookForBlocksToRemove)
{
lookForBlocksToRemove = false;
int32_t numBlocksAtThisFrequency = 0;
int32_t numUnreferencedBlocksAtThisFrequency = 0;
if (1) // to calculate numUnreferencedBlocksAtThisFrequency for setting maxFrequency later
{
// Maybe there is some value in figuring out the ratio of unutilized blocks
// before we decide to discard any; experiment more with that; in that case use the
// commented out portion below
//
bvi.setBitVector(_liveOnEntry);
while (bvi.hasMoreElements())
{
int32_t blockNumber = bvi.getNextElement();
TR::Block * block = blocks[blockNumber];
TR_BlockStructure *blockStructure = block->getStructureOf();
int32_t blockWeight = 1;
if (blockStructure)
{
// blockStructure->calculateFrequencyOfExecution(&blockWeight);
TR_ASSERT(blockNumber == block->getNumber(),"blocks[x]->getNumber() != x");
blockWeight = blockStructureWeight[blockNumber];
}
if (blockWeight == frequency)
{
if (_blocks.getNumberOfLoadsAndStores(blockNumber) == 0)
{
numUnreferencedBlocksAtThisFrequency++;
break;
}
}
}
}
if (trace)
traceMsg(comp, "At frequency %d for %d numBlocks %d numUnreferencedBlocks %d\n", frequency, getSymbolReference()->getReferenceNumber(), numBlocksAtThisFrequency, numUnreferencedBlocksAtThisFrequency);
TR_ScratchList<TR_Structure> unreferencedLoops(comp->trMemory());
TR_ScratchList<TR_Structure> referencedLoops(comp->trMemory());
if ((numUnreferencedBlocksAtThisFrequency > 0) &&
(comp->getOption(TR_EnableRangeSplittingGRA) || // move this check above ?
(comp->cg()->areAssignableGPRsScarce())))
{
bool seenBlockAtThisFrequency = false;
bvi.setBitVector(_liveOnEntry);
while (bvi.hasMoreElements())
{
int32_t blockNumber = bvi.getNextElement();
TR::Block * block = blocks[blockNumber];
TR_BlockStructure *blockStructure = block->getStructureOf();
int32_t blockWeight = 1;
if (blockStructure)
{
blockWeight = blockStructureWeight[block->getNumber()];
}
if (blockWeight == frequency)
{
// If this is a block where the candidate is unused
// try to see if the nearest containing loops requires it
// at some point. If not, then it is worthless to have the
// blocks inside this loop in the live range for this candidate
// as the candidate is never referenced inside the loop
//
//
bool referencedInNearestLoop = true;
if (!getLoopsWithHoles().isEmpty())
{
TR_RegionStructure *parent = blockStructure->getParent()->asRegion();
while (parent &&
!parent->isNaturalLoop())
{
if (parent->getParent())
parent = parent->getParent()->asRegion();
else
{
parent = NULL;
break;
}
}