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OMRRegisterDependency.cpp
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OMRRegisterDependency.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
*******************************************************************************/
#include <stddef.h>
#include <stdint.h>
#include <algorithm>
#include "codegen/BackingStore.hpp"
#include "codegen/CodeGenPhase.hpp"
#include "codegen/CodeGenerator.hpp"
#include "codegen/InstOpCode.hpp"
#include "codegen/Instruction.hpp"
#include "codegen/Linkage.hpp"
#include "codegen/Linkage_inlines.hpp"
#include "codegen/LiveRegister.hpp"
#include "codegen/Machine.hpp"
#include "codegen/MemoryReference.hpp"
#include "codegen/RealRegister.hpp"
#include "codegen/Register.hpp"
#include "codegen/RegisterConstants.hpp"
#include "codegen/RegisterDependency.hpp"
#include "codegen/RegisterDependencyStruct.hpp"
#include "codegen/RegisterPair.hpp"
#include "codegen/TreeEvaluator.hpp"
#include "compile/Compilation.hpp"
#include "control/Options.hpp"
#include "control/Options_inlines.hpp"
#include "env/ObjectModel.hpp"
#include "env/TRMemory.hpp"
#include "il/LabelSymbol.hpp"
#include "il/Node.hpp"
#include "il/Node_inlines.hpp"
#include "infra/Assert.hpp"
#include "infra/List.hpp"
#include "p/codegen/GenerateInstructions.hpp"
#include "p/codegen/PPCInstruction.hpp"
#include "p/codegen/PPCOpsDefines.hpp"
#include "ras/Debug.hpp"
namespace TR { class SymbolReference; }
TR::RegisterDependencyConditions* TR_PPCScratchRegisterDependencyConditions::createDependencyConditions(TR::CodeGenerator *cg,
TR_PPCScratchRegisterDependencyConditions *pre,
TR_PPCScratchRegisterDependencyConditions *post)
{
int32_t preCount = pre ? pre->getNumberOfDependencies() : 0;
int32_t postCount = post ? post->getNumberOfDependencies() : 0;
TR_LiveRegisters *lrVector = cg->getLiveRegisters(TR_VSX_VECTOR);
bool liveVSXVectorReg = (!lrVector || (lrVector->getNumberOfLiveRegisters() > 0));
TR_LiveRegisters *lrScalar = cg->getLiveRegisters(TR_VSX_SCALAR);
bool liveVSXScalarReg = (!lrScalar || (lrScalar->getNumberOfLiveRegisters() > 0));
if (liveVSXVectorReg)
{
preCount += 64;
postCount += 64;
}
else if (liveVSXScalarReg)
{
preCount += 32;
postCount += 32;
}
TR::RegisterDependencyConditions *dependencies = new (cg->trHeapMemory()) TR::RegisterDependencyConditions(preCount,
postCount,
cg->trMemory());
for (int i = 0; i < (pre ? pre->_numGPRDeps : 0); ++i)
{
dependencies->addPreCondition(pre->_gprDeps[i].getRegister(), pre->_gprDeps[i].getRealRegister(), pre->_gprDeps[i].getFlags());
if (pre->_excludeGPR0 & (1 << i))
dependencies->getPreConditions()->getRegisterDependency(i)->setExcludeGPR0();
}
for (int i = 0; i < (post ? post->_numGPRDeps : 0); ++i)
{
dependencies->addPostCondition(post->_gprDeps[i].getRegister(), post->_gprDeps[i].getRealRegister(), post->_gprDeps[i].getFlags());
if (post->_excludeGPR0 & (1 << i))
dependencies->getPostConditions()->getRegisterDependency(i)->setExcludeGPR0();
}
for (int i = 0; i < (pre ? pre->_numCCRDeps : 0); ++i)
{
dependencies->addPreCondition(pre->_ccrDeps[i].getRegister(), pre->_ccrDeps[i].getRealRegister(), pre->_ccrDeps[i].getFlags());
}
for (int i = 0; i < (post ? post->_numCCRDeps : 0); ++i)
{
dependencies->addPostCondition(post->_ccrDeps[i].getRegister(), post->_ccrDeps[i].getRealRegister(), post->_ccrDeps[i].getFlags());
}
const TR::PPCLinkageProperties& properties = cg->getLinkage()->getProperties();
if (liveVSXVectorReg)
{
for (int32_t i=TR::RealRegister::FirstVSR; i<=TR::RealRegister::LastVSR; i++)
{
if (!properties.getPreserved((TR::RealRegister::RegNum)i))
{
TR::Register *vreg = cg->allocateRegister(TR_FPR);
vreg->setPlaceholderReg();
dependencies->addPreCondition(vreg, (TR::RealRegister::RegNum)i);
dependencies->addPostCondition(vreg, (TR::RealRegister::RegNum)i);
}
}
}
else
{
if (liveVSXScalarReg)
{
for (int32_t i=TR::RealRegister::vsr32; i<=TR::RealRegister::LastVSR; i++)
{
if (!properties.getPreserved((TR::RealRegister::RegNum)i))
{
TR::Register *vreg = cg->allocateRegister(TR_FPR);
vreg->setPlaceholderReg();
dependencies->addPreCondition(vreg, (TR::RealRegister::RegNum)i);
dependencies->addPostCondition(vreg, (TR::RealRegister::RegNum)i);
}
}
}
}
return dependencies;
}
OMR::Power::RegisterDependencyConditions::RegisterDependencyConditions(
TR::CodeGenerator *cg,
TR::Node *node,
uint32_t extranum,
TR::Instruction **cursorPtr)
{
List<TR::Register> regList(cg->trMemory());
TR::Instruction *iCursor = (cursorPtr==NULL)?NULL:*cursorPtr;
int32_t totalNum = node->getNumChildren() + extranum;
int32_t i;
cg->comp()->incVisitCount();
int32_t numLongs = 0;
//
// Pre-compute how many longs are global register candidates
//
for (i = 0; i < node->getNumChildren(); ++i)
{
TR::Node *child = node->getChild(i);
TR::Register *reg = child->getRegister();
if (reg!=NULL)
{
if (TR::TreeEvaluator::getHighGlobalRegisterNumberIfAny(child, cg) != -1)
numLongs++;
}
}
totalNum = totalNum + numLongs;
_preConditions = new (totalNum, cg->trMemory()) TR_PPCRegisterDependencyGroup;
_postConditions = new (totalNum, cg->trMemory()) TR_PPCRegisterDependencyGroup;
_numPreConditions = totalNum;
_addCursorForPre = 0;
_numPostConditions = totalNum;
_addCursorForPost = 0;
// First, handle dependencies that match current association
for (i=0; i<node->getNumChildren(); i++)
{
TR::Node *child = node->getChild(i);
TR::Register *reg = child->getRegister();
TR::Register *highReg = NULL;
TR::RealRegister::RegNum regNum = (TR::RealRegister::RegNum)cg->getGlobalRegister(child->getGlobalRegisterNumber());
TR::RealRegister::RegNum highRegNum;
TR_GlobalRegisterNumber validHighRegNum = TR::TreeEvaluator::getHighGlobalRegisterNumberIfAny(child, cg);
if (validHighRegNum != -1)
{
highRegNum = (TR::RealRegister::RegNum)cg->getGlobalRegister(validHighRegNum);
TR::RegisterPair *regPair = reg->getRegisterPair();
TR_ASSERT(regPair, "assertion failure");
highReg = regPair->getHighOrder();
reg = regPair->getLowOrder();
if (highReg->getAssociation() != highRegNum ||
reg->getAssociation() != regNum)
continue;
}
else if (reg->getAssociation() != regNum)
continue;
TR_ASSERT(!regList.find(reg) && (!highReg || !regList.find(highReg)), "Should not happen\n");
addPreCondition(reg, regNum);
addPostCondition(reg, regNum);
regList.add(reg);
if (highReg)
{
addPreCondition(highReg, highRegNum);
addPostCondition(highReg, highRegNum);
regList.add(highReg);
}
}
// Second pass to handle dependencies for which association does not exist
// or does not match
for (i=0; i<node->getNumChildren(); i++)
{
TR::Node *child = node->getChild(i);
TR::Register *reg = child->getRegister();
TR::Register *highReg = NULL;
TR::Register *copyReg = NULL;
TR::Register *highCopyReg = NULL;
TR::RealRegister::RegNum regNum = (TR::RealRegister::RegNum)cg->getGlobalRegister(child->getGlobalRegisterNumber());
TR::RealRegister::RegNum highRegNum;
TR_GlobalRegisterNumber validHighRegNum = TR::TreeEvaluator::getHighGlobalRegisterNumberIfAny(child, cg);
if (validHighRegNum != -1)
{
highRegNum = (TR::RealRegister::RegNum)cg->getGlobalRegister(validHighRegNum);
TR::RegisterPair *regPair = reg->getRegisterPair();
TR_ASSERT(regPair, "assertion failure");
highReg = regPair->getHighOrder();
reg = regPair->getLowOrder();
if (highReg->getAssociation() == highRegNum &&
reg->getAssociation() == regNum)
continue;
}
else if (reg->getAssociation() == regNum)
continue;
if (regList.find(reg) || (highReg && regList.find(highReg)))
{
TR::InstOpCode::Mnemonic opCode;
TR_RegisterKinds kind = reg->getKind();
switch (kind)
{
case TR_GPR:
opCode = TR::InstOpCode::mr;
break;
case TR_FPR:
opCode = TR::InstOpCode::fmr;
break;
case TR_VRF:
opCode = TR::InstOpCode::vor;
break;
case TR_VSX_VECTOR:
opCode = TR::InstOpCode::xxlor;
break;
case TR_CCR:
opCode = TR::InstOpCode::mcrf;
break;
default:
TR_ASSERT(0, "Invalid register kind.");
}
if (regList.find(reg))
{
bool containsInternalPointer = false;
if (reg->getPinningArrayPointer())
containsInternalPointer = true;
copyReg = (reg->containsCollectedReference() && !containsInternalPointer) ?
cg->allocateCollectedReferenceRegister() : cg->allocateRegister(kind);
if (containsInternalPointer)
{
copyReg->setContainsInternalPointer();
copyReg->setPinningArrayPointer(reg->getPinningArrayPointer());
}
if (opCode == TR::InstOpCode::vor || opCode == TR::InstOpCode::xxlor)
iCursor = generateTrg1Src2Instruction(cg, opCode, node, copyReg, reg, reg, iCursor);
else
iCursor = generateTrg1Src1Instruction(cg, opCode, node, copyReg, reg, iCursor);
reg = copyReg;
}
if (highReg && regList.find(highReg))
{
bool containsInternalPointer = false;
if (highReg->getPinningArrayPointer())
containsInternalPointer = true;
highCopyReg = (highReg->containsCollectedReference() && !containsInternalPointer) ?
cg->allocateCollectedReferenceRegister() : cg->allocateRegister(kind);
if (containsInternalPointer)
{
highCopyReg->setContainsInternalPointer();
highCopyReg->setPinningArrayPointer(highReg->getPinningArrayPointer());
}
if (opCode == TR::InstOpCode::vor || opCode == TR::InstOpCode::xxlor)
iCursor = generateTrg1Src2Instruction(cg, opCode, node, highCopyReg, highReg, highReg, iCursor);
else
iCursor = generateTrg1Src1Instruction(cg, opCode, node, highCopyReg, highReg, iCursor);
highReg = highCopyReg;
}
}
addPreCondition(reg, regNum);
addPostCondition(reg, regNum);
if (copyReg != NULL)
cg->stopUsingRegister(copyReg);
else
regList.add(reg);
if (highReg)
{
addPreCondition(highReg, highRegNum);
addPostCondition(highReg, highRegNum);
if (highCopyReg != NULL)
cg->stopUsingRegister(highCopyReg);
else
regList.add(highReg);
}
}
if (iCursor!=NULL && cursorPtr!=NULL)
*cursorPtr = iCursor;
}
void OMR::Power::RegisterDependencyConditions::unionNoRegPostCondition(TR::Register *reg, TR::CodeGenerator *cg)
{
addPostCondition(reg, TR::RealRegister::NoReg);
}
bool OMR::Power::RegisterDependencyConditions::refsRegister(TR::Register *r)
{
for (int i = 0; i < _addCursorForPre; i++)
{
if (_preConditions->getRegisterDependency(i)->getRegister() == r &&
_preConditions->getRegisterDependency(i)->getRefsRegister())
{
return true;
}
}
for (int j = 0; j < _addCursorForPost; j++)
{
if (_postConditions->getRegisterDependency(j)->getRegister() == r &&
_postConditions->getRegisterDependency(j)->getRefsRegister())
{
return true;
}
}
return false;
}
bool OMR::Power::RegisterDependencyConditions::defsRegister(TR::Register *r)
{
for (int i = 0; i < _addCursorForPre; i++)
{
if (_preConditions->getRegisterDependency(i)->getRegister() == r &&
_preConditions->getRegisterDependency(i)->getDefsRegister())
{
return true;
}
}
for (int j = 0; j < _addCursorForPost; j++)
{
if (_postConditions->getRegisterDependency(j)->getRegister() == r &&
_postConditions->getRegisterDependency(j)->getDefsRegister())
{
return true;
}
}
return false;
}
bool OMR::Power::RegisterDependencyConditions::defsRealRegister(TR::Register *r)
{
for (int i = 0; i < _addCursorForPre; i++)
{
if (_preConditions->getRegisterDependency(i)->getRegister()->getAssignedRegister() == r &&
_preConditions->getRegisterDependency(i)->getDefsRegister())
{
return true;
}
}
for (int j = 0; j < _addCursorForPost; j++)
{
if (_postConditions->getRegisterDependency(j)->getRegister()->getAssignedRegister() == r &&
_postConditions->getRegisterDependency(j)->getDefsRegister())
{
return true;
}
}
return false;
}
bool OMR::Power::RegisterDependencyConditions::usesRegister(TR::Register *r)
{
for (int i = 0; i < _addCursorForPre; i++)
{
if (_preConditions->getRegisterDependency(i)->getRegister() == r &&
_preConditions->getRegisterDependency(i)->getUsesRegister())
{
return true;
}
}
for (int j = 0; j < _addCursorForPost; j++)
{
if (_postConditions->getRegisterDependency(j)->getRegister() == r &&
_postConditions->getRegisterDependency(j)->getUsesRegister())
{
return true;
}
}
return false;
}
void OMR::Power::RegisterDependencyConditions::bookKeepingRegisterUses(TR::Instruction *instr, TR::CodeGenerator *cg)
{
TR::Register *virtReg;
TR::RealRegister::RegNum regNum;
TR::RegisterDependencyConditions *assoc;
int numAssoc = 0;
if (instr->getOpCodeValue() == TR::InstOpCode::assocreg)
return;
// Don't track associations or emit assocregs in outlined code
// Register assigner can save/restore associations across outlined sections properly, however no such mechanism exists for instruction selection
// so we don't want these associations to clobber the associations that were set in main line code, which are more important
// TODO: Fix this by saving/restoring the associations in swapInstructionListsWithCompilation()
bool isOOL = cg->getIsInOOLSection();
TR::Machine *machine = cg->machine();
assoc = !isOOL ? new (cg->trHeapMemory()) TR::RegisterDependencyConditions(0,_addCursorForPre, cg->trMemory()) : 0;
for (int i = 0; i < _addCursorForPre; i++)
{
virtReg = _preConditions->getRegisterDependency(i)->getRegister();
regNum = _preConditions->getRegisterDependency(i)->getRealRegister();
if (!isOOL)
{
// Add to the association condition when the association is changed
// from one virtual register to another
if (machine->getVirtualAssociatedWithReal(regNum) != virtReg && machine->getVirtualAssociatedWithReal(regNum) != 0)
{
assoc->addPostCondition(machine->getVirtualAssociatedWithReal(regNum), regNum);
numAssoc++;
}
// Keep track of the virtual register map to real registers!
machine->setVirtualAssociatedWithReal(regNum, virtReg);
}
instr->useRegister(virtReg);
if (!isOOL)
{
cg->setRealRegisterAssociation(virtReg, regNum);
if (_preConditions->getRegisterDependency(i)->getExcludeGPR0())
cg->addRealRegisterInterference(virtReg, TR::RealRegister::gr0);
}
}
if (numAssoc > 0)
{
// Emit an AssocRegs instruction to track the previous association
assoc->setNumPostConditions(numAssoc, cg->trMemory());
generateDepInstruction(cg, TR::InstOpCode::assocreg, instr->getNode(), assoc, instr->getPrev());
}
for (int j = 0; j < _addCursorForPost; j++)
{
virtReg = _postConditions->getRegisterDependency(j)->getRegister();
regNum = _postConditions->getRegisterDependency(j)->getRealRegister();
instr->useRegister(virtReg);
if (!isOOL)
{
cg->setRealRegisterAssociation(virtReg, regNum);
if (_postConditions->getRegisterDependency(j)->getExcludeGPR0())
cg->addRealRegisterInterference(virtReg, TR::RealRegister::gr0);
}
}
}
TR::RegisterDependencyConditions *
OMR::Power::RegisterDependencyConditions::clone(
TR::CodeGenerator *cg,
TR::RegisterDependencyConditions *added)
{
TR::RegisterDependencyConditions *result;
TR::RegisterDependency *singlePair;
int32_t idx, preNum, postNum, addPre=0, addPost=0;
#if defined(DEBUG)
int32_t preGPR=0, postGPR=0;
#endif
if (added != NULL)
{
addPre = added->getAddCursorForPre();
addPost = added->getAddCursorForPost();
}
preNum = this->getAddCursorForPre();
postNum = this->getAddCursorForPost();
result = new (cg->trHeapMemory()) TR::RegisterDependencyConditions(getNumPreConditions()+addPre,
getNumPostConditions()+addPost, cg->trMemory());
for (idx=0; idx<postNum; idx++)
{
singlePair = this->getPostConditions()->getRegisterDependency(idx);
//eliminate duplicate virtual->NoReg dependencies in 'this' conditions
if (!(singlePair->isNoReg() && (added->postConditionContainsVirtual(singlePair->getRegister()))))
result->addPostCondition(singlePair->getRegister(), singlePair->getRealRegister(),
singlePair->getFlags());
#if defined(DEBUG)
if (singlePair->getRegister()->getKind() == TR_GPR)
postGPR++;
#endif
}
for (idx=0; idx<preNum; idx++)
{
singlePair = this->getPreConditions()->getRegisterDependency(idx);
//eliminate duplicate virtual->NoReg dependencies in 'this' conditions
if (!(singlePair->isNoReg() && (added->preConditionContainsVirtual(singlePair->getRegister()))))
result->addPreCondition(singlePair->getRegister(), singlePair->getRealRegister(),
singlePair->getFlags());
#if defined(DEBUG)
if (singlePair->getRegister()->getKind() == TR_GPR)
preGPR++;
#endif
}
for (idx=0; idx<addPost; idx++)
{
singlePair = added->getPostConditions()->getRegisterDependency(idx);
result->addPostCondition(singlePair->getRegister(), singlePair->getRealRegister(),
singlePair->getFlags());
#if defined(DEBUG)
if (singlePair->getRegister()->getKind() == TR_GPR)
postGPR++;
#endif
}
for (idx=0; idx<addPre; idx++)
{
singlePair = added->getPreConditions()->getRegisterDependency(idx);
result->addPreCondition(singlePair->getRegister(), singlePair->getRealRegister(),
singlePair->getFlags());
#if defined(DEBUG)
if (singlePair->getRegister()->getKind() == TR_GPR)
preGPR++;
#endif
}
#if defined(DEBUG)
int32_t max_gpr = cg->getProperties().getNumAllocatableIntegerRegisters();
TR_ASSERT(preGPR<=max_gpr && postGPR<=max_gpr, "Over the limit of available global regsiters.");
#endif
return result;
}
TR::RegisterDependencyConditions *OMR::Power::RegisterDependencyConditions::cloneAndFix(
TR::CodeGenerator * cg, TR::RegisterDependencyConditions *added)
{
TR::RegisterDependencyConditions *result;
TR::RegisterDependency *singlePair;
int32_t idx, postNum, addPost=0;
if (added != NULL)
{
addPost = added->getAddCursorForPost();
}
postNum = this->getAddCursorForPost();
result = new (cg->trHeapMemory()) TR::RegisterDependencyConditions(0, postNum+addPost, cg->trMemory());
for (idx=0; idx<postNum; idx++)
{
singlePair = this->getPostConditions()->getRegisterDependency(idx);
result->addPostCondition(singlePair->getRegister(), singlePair->getRealRegister(),
singlePair->getFlags());
}
for (idx=0; idx<addPost; idx++)
{
singlePair = added->getPostConditions()->getRegisterDependency(idx);
result->addPostCondition(singlePair->getRegister(), singlePair->getRealRegister(),
singlePair->getFlags());
}
return result;
}
static TR::RegisterDependency*
findDependencyChainHead(TR::RegisterDependency *dep,
OMR::RegisterDependencyMap& map)
{
TR::RegisterDependency *cursor = map.getDependencyWithSourceAssigned(dep->getRealRegister());
// Already at head of chain
if (!cursor)
return dep;
// Follow the chain until we get to a dep who's target isn't assigned to another dep
// or until we're back at the first dep
while (cursor != dep)
{
TR::RegisterDependency *nextDep = map.getDependencyWithSourceAssigned(cursor->getRealRegister());
if (!nextDep)
break;
cursor = nextDep;
}
return cursor;
}
static void assignFreeRegisters(TR::Instruction *currentInstruction,
TR::RegisterDependency *dep,
OMR::RegisterDependencyMap& map,
TR::CodeGenerator *cg)
{
TR::Machine *machine = cg->machine();
// Assign a chain of dependencies where the head of the chain depends on a free reg
while (dep)
{
TR_ASSERT(machine->getRealRegister(dep->getRealRegister())->getState() == TR::RealRegister::Free, "Expecting free target register");
TR::RealRegister *assignedReg = dep->getRegister()->getAssignedRealRegister() ?
toRealRegister(dep->getRegister()->getAssignedRealRegister()) : NULL;
machine->coerceRegisterAssignment(currentInstruction, dep->getRegister(), dep->getRealRegister());
dep->getRegister()->block();
dep = assignedReg ?
map.getDependencyWithTarget(assignedReg->getRegisterNumber()) : NULL;
}
}
static void assignContendedRegisters(TR::Instruction *currentInstruction,
TR::RegisterDependency *dep,
OMR::RegisterDependencyMap& map,
bool depsBlocked,
TR::CodeGenerator *cg)
{
TR::Machine *machine = cg->machine();
dep = findDependencyChainHead(dep, map);
TR::Register *virtReg = dep->getRegister();
TR::RealRegister::RegNum targetRegNum = dep->getRealRegister();
TR::RealRegister *targetReg = machine->getRealRegister(targetRegNum);
TR::RealRegister *assignedReg = virtReg->getAssignedRealRegister() ?
toRealRegister(virtReg->getAssignedRealRegister()) : NULL;
// Chain of length 1
if (!assignedReg || !map.getDependencyWithTarget(assignedReg->getRegisterNumber()))
{
machine->coerceRegisterAssignment(currentInstruction, virtReg, targetRegNum);
virtReg->block();
return;
}
// Chain of length 2, handled here instead of below to get 3*xor exchange on GPRs
if (map.getDependencyWithTarget(assignedReg->getRegisterNumber()) == map.getDependencyWithSourceAssigned(targetRegNum))
{
TR::Register *targetVirtReg = targetReg->getAssignedRegister();
machine->coerceRegisterAssignment(currentInstruction, virtReg, targetRegNum);
virtReg->block();
targetVirtReg->block();
return;
}
// Grab a spare reg in order to free the target of the first dep
// At this point the first dep's target could be blocked, assigned, or NoReg
// If it's blocked or assigned we allocate a spare and assign the target's virtual to it
// If it's NoReg, the spare reg will be used as the first dep's actual target
TR::RealRegister *spareReg = machine->findBestFreeRegister(currentInstruction, virtReg->getKind(),
targetRegNum == TR::RealRegister::NoReg ? dep->getExcludeGPR0() : false, false,
targetRegNum == TR::RealRegister::NoReg ? virtReg : targetReg->getAssignedRegister());
bool haveFreeSpare = spareReg != NULL;
if (!spareReg)
{
// If the regs in this dep group are not blocked we need to make sure we don't spill a reg that's in the middle of the chain
if (!depsBlocked)
{
if (targetRegNum == TR::RealRegister::NoReg)
spareReg = machine->freeBestRegister(currentInstruction,
map.getDependencyWithTarget(assignedReg->getRegisterNumber())->getRegister(),
assignedReg, false);
else
spareReg = machine->freeBestRegister(currentInstruction, virtReg, targetReg, false);
}
else
{
if (targetRegNum == TR::RealRegister::NoReg)
spareReg = machine->freeBestRegister(currentInstruction, virtReg, NULL, dep->getExcludeGPR0());
else
spareReg = machine->freeBestRegister(currentInstruction, targetReg->getAssignedRegister(), NULL, false);
}
}
if (targetRegNum != TR::RealRegister::NoReg && spareReg != targetReg)
{
machine->coerceRegisterAssignment(currentInstruction, targetReg->getAssignedRegister(), spareReg->getRegisterNumber());
}
TR_ASSERT(targetRegNum == TR::RealRegister::NoReg ||
targetReg->getState() == TR::RealRegister::Free, "Expecting free target register");
if (depsBlocked || targetRegNum != TR::RealRegister::NoReg || haveFreeSpare)
{
machine->coerceRegisterAssignment(currentInstruction, virtReg,
targetRegNum == TR::RealRegister::NoReg ?
spareReg->getRegisterNumber() : targetRegNum);
virtReg->block();
}
dep = map.getDependencyWithTarget(assignedReg->getRegisterNumber());
while (dep)
{
virtReg = dep->getRegister();
targetRegNum = dep->getRealRegister();
targetReg = machine->getRealRegister(targetRegNum);
assignedReg = virtReg->getAssignedRealRegister() ?
toRealRegister(virtReg->getAssignedRealRegister()) : NULL;
TR_ASSERT(targetReg->getState() == TR::RealRegister::Free || targetReg == spareReg,
"Expecting free target register or target to have been filled to free spare register");
machine->coerceRegisterAssignment(currentInstruction, virtReg, targetRegNum);
virtReg->block();
dep = assignedReg ?
map.getDependencyWithTarget(assignedReg->getRegisterNumber()) : NULL;
}
}
void TR_PPCRegisterDependencyGroup::assignRegisters(TR::Instruction *currentInstruction,
TR_RegisterKinds kindToBeAssigned,
uint32_t numberOfRegisters,
TR::CodeGenerator *cg)
{
TR::Machine *machine = cg->machine();
TR::Register *virtReg;
TR::RealRegister::RegNum dependentRegNum;
TR::RealRegister *dependentRealReg, *assignedRegister, *realReg;
int i, j;
TR::Compilation *comp = cg->comp();
for (i = 0; i < numberOfRegisters; i++)
{
virtReg = _dependencies[i].getRegister();
if (_dependencies[i].isSpilledReg())
{
TR_ASSERT(virtReg->getBackingStorage(), "Should have a backing store if SpilledReg");
if (virtReg->getAssignedRealRegister())
{
// this happens when the register was first spilled in main line path then was reverse spilled
// and assigned to a real register in OOL path. We protected the backing store when doing
// the reverse spill so we could re-spill to the same slot now
if (comp->getOption(TR_TraceCG))
traceMsg(comp,"\nOOL: Found register spilled in main line and re-assigned inside OOL");
TR::Node *currentNode = currentInstruction->getNode();
TR::RealRegister *assignedReg = toRealRegister(virtReg->getAssignedRegister());
TR::MemoryReference *tempMR = TR::MemoryReference::createWithSymRef(cg, currentNode, (TR::SymbolReference*)virtReg->getBackingStorage()->getSymbolReference(), sizeof(uintptr_t));
TR_RegisterKinds rk = virtReg->getKind();
TR::InstOpCode::Mnemonic opCode;
switch (rk)
{
case TR_GPR:
opCode =TR::InstOpCode::Op_load;
break;
case TR_FPR:
opCode = virtReg->isSinglePrecision() ? TR::InstOpCode::lfs : TR::InstOpCode::lfd;
break;
default:
TR_ASSERT(0, "Register kind not supported in OOL spill");
break;
}
TR::Instruction *inst = generateTrg1MemInstruction(cg, opCode, currentNode, assignedReg, tempMR, currentInstruction);
assignedReg->setAssignedRegister(NULL);
virtReg->setAssignedRegister(NULL);
assignedReg->setState(TR::RealRegister::Free);
if (comp->getDebug())
cg->traceRegisterAssignment("Generate reload of virt %s due to spillRegIndex dep at inst %p\n", comp->getDebug()->getName(virtReg),currentInstruction);
cg->traceRAInstruction(inst);
}
if (!(std::find(cg->getSpilledRegisterList()->begin(), cg->getSpilledRegisterList()->end(), virtReg) != cg->getSpilledRegisterList()->end()))
cg->getSpilledRegisterList()->push_front(virtReg);
}
}
uint32_t numGPRs = 0;
uint32_t numFPRs = 0;
uint32_t numVRFs = 0;
bool haveSpilledCCRs = false;
// Used to do lookups using real register numbers
OMR::RegisterDependencyMap map(_dependencies, numberOfRegisters);
for (i = 0; i < numberOfRegisters; i++)
{
map.addDependency(_dependencies[i], i);
if (!_dependencies[i].isSpilledReg())
{
virtReg = _dependencies[i].getRegister();
switch (virtReg->getKind())
{
case TR_GPR:
++numGPRs;
break;
case TR_FPR:
++numFPRs;
break;
case TR_VRF:
++numVRFs;
break;
case TR_CCR:
if (virtReg->getAssignedRegister() == NULL &&
virtReg->getBackingStorage() == NULL)
haveSpilledCCRs = true;
break;
default:
break;
}
}
}
#ifdef DEBUG
int lockedGPRs = 0;
int lockedFPRs = 0;
int lockedVRFs = 0;
// count up how many registers are locked for each type
for(i = TR::RealRegister::FirstGPR; i <= TR::RealRegister::LastGPR; i++)
{
realReg = machine->getRealRegister((TR::RealRegister::RegNum)i);
if (realReg->getState() == TR::RealRegister::Locked)
lockedGPRs++;
}
for(i = TR::RealRegister::FirstFPR; i <= TR::RealRegister::LastFPR; i++)
{
realReg = machine->getRealRegister((TR::RealRegister::RegNum)i);
if (realReg->getState() == TR::RealRegister::Locked)
lockedFPRs++;
}
for(i = TR::RealRegister::FirstVRF; i <= TR::RealRegister::LastVRF; i++)
{
realReg = machine->getRealRegister((TR::RealRegister::RegNum)i);
if (realReg->getState() == TR::RealRegister::Locked)
lockedVRFs++;
}
TR_ASSERT(lockedGPRs == machine->getNumberOfLockedRegisters(TR_GPR), "Inconsistent number of locked GPRs");
TR_ASSERT(lockedFPRs == machine->getNumberOfLockedRegisters(TR_FPR), "Inconsistent number of locked FPRs");
TR_ASSERT(lockedVRFs == machine->getNumberOfLockedRegisters(TR_VRF), "Inconsistent number of locked VRFs");
#endif
// To handle circular dependencies, we block a real register if (1) it is already assigned to a correct
// virtual register and (2) if it is assigned to one register in the list but is required by another.
// However, if all available registers are requested, we do not block in case (2) to avoid all registers
// being blocked.
bool haveSpareGPRs = true;
bool haveSpareFPRs = true;
bool haveSpareVRFs = true;
TR_ASSERT(numGPRs <= (TR::RealRegister::LastGPR - TR::RealRegister::FirstGPR + 1 - machine->getNumberOfLockedRegisters(TR_GPR)), "Too many GPR dependencies, unable to assign" );
TR_ASSERT(numFPRs <= (TR::RealRegister::LastFPR - TR::RealRegister::FirstFPR + 1 - machine->getNumberOfLockedRegisters(TR_FPR)), "Too many FPR dependencies, unable to assign" );
TR_ASSERT(numVRFs <= (TR::RealRegister::LastVRF - TR::RealRegister::FirstVRF + 1 - machine->getNumberOfLockedRegisters(TR_VRF)), "Too many VRF dependencies, unable to assign" );
if (numGPRs == (TR::RealRegister::LastGPR - TR::RealRegister::FirstGPR + 1 - machine->getNumberOfLockedRegisters(TR_GPR)))
haveSpareGPRs = false;
if (numFPRs == (TR::RealRegister::LastFPR - TR::RealRegister::FirstFPR + 1 - machine->getNumberOfLockedRegisters(TR_FPR)))
haveSpareFPRs = false;
if (numVRFs == (TR::RealRegister::LastVRF - TR::RealRegister::FirstVRF + 1 - machine->getNumberOfLockedRegisters(TR_VRF)))
haveSpareVRFs = false;
for (i = 0; i < numberOfRegisters; i++)
{
virtReg = _dependencies[i].getRegister();
if (virtReg->getAssignedRealRegister() != NULL)
{
if (_dependencies[i].isNoReg())
{
virtReg->block();
}
else
{
TR::RealRegister::RegNum assignedRegNum = toRealRegister(virtReg->getAssignedRealRegister())->getRegisterNumber();
// Always block if the required register and assigned register match or if the assigned register is
// required by another dependency but only if there are any spare registers left so as to avoid blocking
// all existing registers
if (_dependencies[i].getRealRegister() == assignedRegNum ||
(map.getDependencyWithTarget(assignedRegNum) &&
((virtReg->getKind() != TR_GPR || haveSpareGPRs) &&
(virtReg->getKind() != TR_FPR || haveSpareFPRs) &&
(virtReg->getKind() != TR_VRF || haveSpareVRFs))))
{
virtReg->block();
}
}
}
}
// If spilled CCRs are present in the dependencies and we are not blocking GPRs
// (because we may not have any spare ones) we will assign the CCRs first.
// This is because in order to assign a spilled virtual to a physical CCR
// we need to reverse spill it to a GPR first and then assign it to the
// CCR, so we do that first to avoid having all the GPRs become assigned and blocked.
// Note: It is safe to assign CCRs before GPRs in any circumstance, but the extra
// checks are cheap and let us avoid an extra loop through the dependencies for
// what should be a relatively infrequent situation anyway.
if (haveSpilledCCRs && !haveSpareGPRs)
{
for (i = 0; i < numberOfRegisters; i++)
{
TR::RegisterDependency ®Dep = _dependencies[i];
virtReg = regDep.getRegister();
if (virtReg->getKind() != TR_CCR)
continue;
dependentRegNum = regDep.getRealRegister();
dependentRealReg = machine->getRealRegister(dependentRegNum);
if (!regDep.isNoReg() &&
!regDep.isSpilledReg() &&
dependentRealReg->getState() == TR::RealRegister::Free)
{
assignFreeRegisters(currentInstruction, ®Dep, map, cg);
}
}
}
// Assign all virtual regs that depend on a specific real reg that is free
for (i = 0; i < numberOfRegisters; i++)
{
TR::RegisterDependency ®Dep = _dependencies[i];
virtReg = regDep.getRegister();
dependentRegNum = regDep.getRealRegister();
dependentRealReg = machine->getRealRegister(dependentRegNum);
if (!regDep.isNoReg() &&
!regDep.isSpilledReg() &&
dependentRealReg->getState() == TR::RealRegister::Free)
{
assignFreeRegisters(currentInstruction, ®Dep, map, cg);
}
}
// Assign all virtual regs that depend on a specific real reg that is not free
for (i = 0; i < numberOfRegisters; i++)
{
virtReg = _dependencies[i].getRegister();
assignedRegister = NULL;
if (virtReg->getAssignedRealRegister() != NULL)
{
assignedRegister = toRealRegister(virtReg->getAssignedRealRegister());
}
dependentRegNum = _dependencies[i].getRealRegister();
dependentRealReg = machine->getRealRegister(dependentRegNum);
if (!_dependencies[i].isNoReg() &&
!_dependencies[i].isSpilledReg() &&
dependentRealReg != assignedRegister)
{
bool depsBlocked = false;
switch (_dependencies[i].getRegister()->getKind())
{
case TR_GPR:
depsBlocked = haveSpareGPRs;
break;
case TR_FPR:
depsBlocked = haveSpareFPRs;
break;
case TR_VRF: