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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 <algorithm>
#include <stdint.h>
#include <string.h>
#include "codegen/BackingStore.hpp"
#include "codegen/CodeGenerator.hpp"
#include "codegen/Instruction.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 "compile/Compilation.hpp"
#include "control/Options.hpp"
#include "control/Options_inlines.hpp"
#include "env/TRMemory.hpp"
#include "il/Block.hpp"
#include "il/DataTypes.hpp"
#include "il/ILOpCodes.hpp"
#include "il/Node.hpp"
#include "il/Node_inlines.hpp"
#include "infra/Assert.hpp"
#include "infra/List.hpp"
#include "ras/Debug.hpp"
#include "ras/DebugCounter.hpp"
#include "x/codegen/X86Instruction.hpp"
#include "codegen/InstOpCode.hpp"
#include "x/codegen/X86Register.hpp"
////////////////////////
// Hack markers
//
// TODO:AMD64: IA32 FPR GRA currently interferes XMM GRA in a somewhat
// confusing way that doesn't occur on AMD64.
#define XMM_GPRS_USE_DISTINCT_NUMBERS(cg) (cg->comp()->target().is64Bit())
static void generateRegcopyDebugCounter(TR::CodeGenerator *cg, const char *category)
{
if (!cg->comp()->getOptions()->enableDebugCounters())
return;
TR::TreeTop *tt = cg->getCurrentEvaluationTreeTop();
const char *fullName = TR::DebugCounter::debugCounterName(cg->comp(),
"regcopy/cg.genRegDepConditions/%s/(%s)/%s/block_%d",
category,
cg->comp()->signature(),
cg->comp()->getHotnessName(cg->comp()->getMethodHotness()),
tt->getEnclosingBlock()->getNumber());
TR::Instruction *cursor = cg->lastInstructionBeforeCurrentEvaluationTreeTop();
cg->generateDebugCounter(cursor, fullName, 1, TR::DebugCounter::Undetermined);
}
OMR::X86::RegisterDependencyConditions::RegisterDependencyConditions(uint16_t numPreConds, uint16_t numPostConds, TR_Memory * m)
: _preConditions(new (numPreConds, m) TR::RegisterDependencyGroup),
_postConditions(new (numPostConds, m) TR::RegisterDependencyGroup),
_numPreConditions(numPreConds),
_addCursorForPre(0),
_numPostConditions(numPostConds),
_addCursorForPost(0)
{}
OMR::X86::RegisterDependencyConditions::RegisterDependencyConditions(
TR::Node *node,
TR::CodeGenerator *cg,
uint16_t additionalRegDeps,
List<TR::Register> *popRegisters)
:_numPreConditions(-1),_numPostConditions(-1),
_addCursorForPre(0),_addCursorForPost(0)
{
TR::Register *copyReg = NULL;
TR::Register *highCopyReg = NULL;
List<TR::Register> registers(cg->trMemory());
TR::Machine *machine = cg->machine();
TR::Compilation *comp = cg->comp();
int32_t numLongs = 0;
for (int32_t i = 0; i < node->getNumChildren(); ++i)
{
TR::Node *child = node->getChild(i);
if (child->getRegister()->getKind() == TR_GPR && child->getHighGlobalRegisterNumber() > -1)
{
numLongs++;
}
}
_preConditions = new (node->getNumChildren() + additionalRegDeps + numLongs, cg->trMemory()) TR::RegisterDependencyGroup;
_postConditions = new (node->getNumChildren() + additionalRegDeps + numLongs, cg->trMemory()) TR::RegisterDependencyGroup;
_numPreConditions = node->getNumChildren() + additionalRegDeps + numLongs;
_numPostConditions = node->getNumChildren() + additionalRegDeps + numLongs;
int32_t numLongsAdded = 0;
for (int32_t i = node->getNumChildren()-1; i >= 0; i--)
{
TR::Node *child = node->getChild(i);
TR::Register *globalReg = child->getRegister();
TR::Register *highGlobalReg = NULL;
TR_GlobalRegisterNumber globalRegNum = child->getGlobalRegisterNumber();
TR_GlobalRegisterNumber highGlobalRegNum = child->getHighGlobalRegisterNumber();
TR::RealRegister::RegNum realRegNum = TR::RealRegister::NoReg, realHighRegNum = TR::RealRegister::NoReg;
if (globalReg->getKind() == TR_GPR || globalReg->getKind() == TR_VRF || XMM_GPRS_USE_DISTINCT_NUMBERS(cg))
{
realRegNum = (TR::RealRegister::RegNum) cg->getGlobalRegister(globalRegNum);
if (highGlobalRegNum > -1)
realHighRegNum = (TR::RealRegister::RegNum)
cg->getGlobalRegister(highGlobalRegNum);
}
else if (globalReg->getKind() == TR_FPR)
{
// Convert the global register number from an st0-based value to an xmm0-based one.
//
realRegNum = (TR::RealRegister::RegNum)
(cg->getGlobalRegister(globalRegNum)
- TR::RealRegister::FirstFPR
+ TR::RealRegister::FirstXMMR);
// Find the global register that has been allocated in this XMMR, if any.
//
TR::Register *xmmGlobalReg = cg->machine()->getXMMGlobalRegister(realRegNum - TR::RealRegister::FirstXMMR);
if (xmmGlobalReg)
globalReg = xmmGlobalReg;
}
else
{
TR_ASSERT_FATAL_WITH_NODE(node, false, "invalid global register kind %d, reg=%p", globalReg->getKind(), globalReg);
}
if (registers.find(globalReg))
{
if (globalReg->getKind() == TR_GPR)
{
bool containsInternalPointer = false;
TR::RegisterPair *globalRegPair = globalReg->getRegisterPair();
if (globalRegPair)
{
highGlobalReg = globalRegPair->getHighOrder();
globalReg = globalRegPair->getLowOrder();
}
else if (child->getHighGlobalRegisterNumber() > -1)
TR_ASSERT(0, "Long child does not have a register pair\n");
if (globalReg->getPinningArrayPointer())
containsInternalPointer = true;
copyReg = (globalReg->containsCollectedReference() && !containsInternalPointer) ?
cg->allocateCollectedReferenceRegister() : cg->allocateRegister();
if (containsInternalPointer)
{
copyReg->setContainsInternalPointer();
copyReg->setPinningArrayPointer(globalReg->getPinningArrayPointer());
}
TR::Instruction *prevInstr = cg->getAppendInstruction();
TR::Instruction *placeToAdd = prevInstr;
if (prevInstr && prevInstr->getOpCode().isFusableCompare())
{
TR::Instruction *prevPrevInstr = prevInstr->getPrev();
if (prevPrevInstr)
{
if (comp->getOption(TR_TraceCG))
traceMsg(comp, "Moving reg reg copy earlier (after %p) in %s\n", prevPrevInstr, comp->signature());
placeToAdd = prevPrevInstr;
}
}
generateRegRegInstruction(placeToAdd, TR::InstOpCode::MOVRegReg(), copyReg, globalReg, cg);
if (highGlobalReg)
{
generateRegcopyDebugCounter(cg, "gpr-pair");
containsInternalPointer = false;
if (highGlobalReg->getPinningArrayPointer())
containsInternalPointer = true;
highCopyReg = (highGlobalReg->containsCollectedReference() && !containsInternalPointer) ?
cg->allocateCollectedReferenceRegister() : cg->allocateRegister();
if (containsInternalPointer)
{
highCopyReg->setContainsInternalPointer();
highCopyReg->setPinningArrayPointer(highGlobalReg->getPinningArrayPointer());
}
generateRegRegInstruction(TR::InstOpCode::MOV4RegReg, node, highCopyReg, highGlobalReg, cg);
}
else
{
generateRegcopyDebugCounter(cg, "gpr");
highCopyReg = NULL;
}
}
else if (globalReg->getKind() == TR_FPR)
{
generateRegcopyDebugCounter(cg, "fpr");
if (globalReg->isSinglePrecision())
{
copyReg = cg->allocateSinglePrecisionRegister(TR_FPR);
generateRegRegInstruction(TR::InstOpCode::MOVAPSRegReg, node, copyReg, child->getRegister(), cg);
}
else
{
copyReg = cg->allocateRegister(TR_FPR);
generateRegRegInstruction(TR::InstOpCode::MOVAPDRegReg, node, copyReg, child->getRegister(), cg);
}
}
else if (globalReg->getKind() == TR_VRF)
{
generateRegcopyDebugCounter(cg, "vrf");
copyReg = cg->allocateRegister(TR_VRF);
generateRegRegInstruction(TR::InstOpCode::MOVDQURegReg, node, copyReg, child->getRegister(), cg);
}
globalReg = copyReg;
highGlobalReg = highCopyReg;
}
else
{
registers.add(globalReg);
TR::RegisterPair *globalRegPair = globalReg->getRegisterPair();
if (globalRegPair)
{
highGlobalReg = globalRegPair->getHighOrder();
globalReg = globalRegPair->getLowOrder();
}
else if (child->getHighGlobalRegisterNumber() > -1)
TR_ASSERT(0, "Long child does not have a register pair\n");
}
if (globalReg->getKind() == TR_GPR)
{
addPreCondition(globalReg, realRegNum, cg);
addPostCondition(globalReg, realRegNum, cg);
if (highGlobalReg)
{
numLongsAdded++;
addPreCondition(highGlobalReg, realHighRegNum, cg);
addPostCondition(highGlobalReg, realHighRegNum, cg);
}
}
else if (globalReg->getKind() == TR_FPR || globalReg->getKind() == TR_VRF)
{
addPreCondition(globalReg, realRegNum, cg);
addPostCondition(globalReg, realRegNum, cg);
cg->machine()->setXMMGlobalRegister(realRegNum - TR::RealRegister::FirstXMMR, globalReg);
}
// If the register dependency isn't actually used
// (dead store elimination probably removed it)
// and this is a float then we have to pop it off the stack.
//
if (child->getOpCodeValue() == TR::PassThrough)
{
child = child->getFirstChild();
}
if (copyReg)
{
cg->stopUsingRegister(copyReg);
if (highCopyReg)
cg->stopUsingRegister(highCopyReg);
}
}
if (numLongs != numLongsAdded)
TR_ASSERT(0, "Mismatch numLongs %d numLongsAdded %d\n", numLongs, numLongsAdded);
}
uint32_t OMR::X86::RegisterDependencyConditions::unionDependencies(
TR::RegisterDependencyGroup *deps,
uint32_t cursor,
TR::Register *vr,
TR::RealRegister::RegNum rr,
TR::CodeGenerator *cg,
uint8_t flag,
bool isAssocRegDependency)
{
TR::Machine *machine = cg->machine();
// If vr is already in deps, combine the existing association with rr.
//
if (vr)
{
if (vr->getRealRegister())
{
TR::RealRegister::RegNum vrIndex = toRealRegister(vr)->getRegisterNumber();
switch (vrIndex)
{
case TR::RealRegister::esp:
case TR::RealRegister::vfp:
// esp and vfp are ok, and are ignorable, since local RA already
// deals with those without help from regdeps.
//
//
TR_ASSERT(rr == vrIndex || rr == TR::RealRegister::NoReg, "esp and vfp can be assigned only to themselves or NoReg, not %s", cg->getDebug()->getRealRegisterName(rr));
break;
default:
TR_ASSERT(0, "Unexpected real register %s in regdep", cg->getDebug()->getName(vr, TR_UnknownSizeReg));
break;
}
return cursor;
}
for (uint32_t candidate = 0; candidate < cursor; candidate++)
{
TR::RegisterDependency *dep = deps->getRegisterDependency(candidate);
if (dep->getRegister() == vr)
{
// Keep the stronger of the two constraints
//
TR::RealRegister::RegNum min = std::min(rr, dep->getRealRegister());
TR::RealRegister::RegNum max = std::max(rr, dep->getRealRegister());
if (min == TR::RealRegister::NoReg)
{
// Anything is stronger than NoReg
deps->setDependencyInfo(candidate, vr, max, cg, flag, isAssocRegDependency);
}
else if(max == TR::RealRegister::ByteReg)
{
// Specific regs are stronger than ByteReg
TR_ASSERT(min <= TR::RealRegister::Last8BitGPR, "Only byte registers are compatible with ByteReg dependency");
deps->setDependencyInfo(candidate, vr, min, cg, flag, isAssocRegDependency);
}
else
{
// This assume fires for some assocRegs instructions
//TR_ASSERT(min == max, "Specific register dependency is only compatible with itself");
if (min != max)
continue;
// Nothing to do
}
return cursor;
}
}
}
// vr is not already in deps, so add a new dep
//
deps->setDependencyInfo(cursor++, vr, rr, cg, flag, isAssocRegDependency);
return cursor;
}
void OMR::X86::RegisterDependencyConditions::unionNoRegPostCondition(TR::Register *reg, TR::CodeGenerator *cg)
{
unionPostCondition(reg, TR::RealRegister::NoReg, cg);
}
uint32_t OMR::X86::RegisterDependencyConditions::unionRealDependencies(
TR::RegisterDependencyGroup *deps,
uint32_t cursor,
TR::Register *vr,
TR::RealRegister::RegNum rr,
TR::CodeGenerator *cg,
uint8_t flag,
bool isAssocRegDependency)
{
TR::Machine *machine = cg->machine();
// A vmThread/ebp dependency can be ousted by any other ebp dependency.
// This situation should only occur when ebp is assigned as a global register.
static TR::RealRegister::RegNum vmThreadRealRegisterIndex = TR::RealRegister::ebp;
if (rr == vmThreadRealRegisterIndex)
{
uint16_t candidate;
TR::Register *vmThreadRegister = cg->getVMThreadRegister();
for (candidate = 0; candidate < cursor; candidate++)
{
TR::RegisterDependency *dep = deps->getRegisterDependency(candidate);
// Check for a pre-existing ebp dependency.
if (dep->getRealRegister() == vmThreadRealRegisterIndex)
{
// Any ebp dependency is stronger than a vmThread/ebp dependency.
// Oust any vmThread dependency.
if (dep->getRegister() == vmThreadRegister)
{
//diagnostic("\nEnvicting virt reg %s dep for %s replaced with virt reg %s\n {\"%s\"}",
// getDebug()->getName(dep->getRegister()),getDebug()->getName(machine->getRealRegister(rr)),getDebug()->getName(vr), cg->comp()->getCurrentMethod()->signature());
deps->setDependencyInfo(candidate, vr, rr, cg, flag, isAssocRegDependency);
}
else
{
//diagnostic("\nSkipping virt reg %s dep for %s in favour of %s\n {%s}}\n",
// getDebug()->getName(vr),getDebug()->getName(machine->getRealRegister(rr)),getDebug()->getName(dep->getRegister()), cg->comp()->getCurrentMethod()->signature());
TR_ASSERT(vr == vmThreadRegister, "Conflicting EBP register dependencies.\n");
}
return cursor;
}
}
}
// Not handled above, so add a new dependency.
//
deps->setDependencyInfo(cursor++, vr, rr, cg, flag, isAssocRegDependency);
return cursor;
}
TR::RegisterDependencyConditions *OMR::X86::RegisterDependencyConditions::clone(TR::CodeGenerator *cg, uint32_t additionalRegDeps)
{
TR::RegisterDependencyConditions *other =
new (cg->trHeapMemory()) TR::RegisterDependencyConditions(_numPreConditions + additionalRegDeps,
_numPostConditions + additionalRegDeps, cg->trMemory());
for (int32_t i = _numPreConditions-1; i >= 0; --i)
{
TR::RegisterDependency *dep = getPreConditions()->getRegisterDependency(i);
other->getPreConditions()->setDependencyInfo(i, dep->getRegister(), dep->getRealRegister(), cg, dep->getFlags());
}
for (int32_t i = _numPostConditions-1; i >= 0; --i)
{
TR::RegisterDependency *dep = getPostConditions()->getRegisterDependency(i);
other->getPostConditions()->setDependencyInfo(i, dep->getRegister(), dep->getRealRegister(), cg, dep->getFlags());
}
other->setAddCursorForPre(_addCursorForPre);
other->setAddCursorForPost(_addCursorForPost);
return other;
}
uint32_t OMR::X86::RegisterDependencyConditions::setNumPreConditions(uint32_t n, TR_Memory * m)
{
if (_preConditions == NULL)
{
_preConditions = new (n, m) TR::RegisterDependencyGroup;
}
return (_numPreConditions = n);
}
uint32_t OMR::X86::RegisterDependencyConditions::setNumPostConditions(uint32_t n, TR_Memory * m)
{
if (_postConditions == NULL)
{
_postConditions = new (n, m) TR::RegisterDependencyGroup;
}
return (_numPostConditions = n);
}
void OMR::X86::RegisterDependencyConditions::setMayNeedToPopFPRegisters(bool b)
{
if (_preConditions)
_preConditions->setMayNeedToPopFPRegisters(b);
if (_postConditions)
_postConditions->setMayNeedToPopFPRegisters(b);
}
void OMR::X86::RegisterDependencyConditions::setNeedToClearFPStack(bool b)
{
if (_preConditions)
_preConditions->setNeedToClearFPStack(b);
else
{
if (_postConditions)
_postConditions->setNeedToClearFPStack(b);
}
}
TR::RegisterDependency *OMR::X86::RegisterDependencyConditions::findPreCondition (TR::Register *vr)
{
return _preConditions ->findDependency(vr, _addCursorForPre );
}
TR::RegisterDependency *OMR::X86::RegisterDependencyConditions::findPostCondition(TR::Register *vr)
{
return _postConditions->findDependency(vr, _addCursorForPost);
}
TR::RegisterDependency *OMR::X86::RegisterDependencyConditions::findPreCondition (TR::RealRegister::RegNum rr)
{
return _preConditions ->findDependency(rr, _addCursorForPre );
}
TR::RegisterDependency *OMR::X86::RegisterDependencyConditions::findPostCondition(TR::RealRegister::RegNum rr)
{
return _postConditions->findDependency(rr, _addCursorForPost);
}
void OMR::X86::RegisterDependencyConditions::assignPreConditionRegisters(TR::Instruction *currentInstruction, TR_RegisterKinds kindsToBeAssigned, TR::CodeGenerator *cg)
{
if (_preConditions != NULL)
{
if ((kindsToBeAssigned & TR_X87_Mask))
{
_preConditions->assignFPRegisters(currentInstruction, kindsToBeAssigned, _numPreConditions, cg);
}
else
{
cg->clearRegisterAssignmentFlags();
cg->setRegisterAssignmentFlag(TR_PreDependencyCoercion);
_preConditions->assignRegisters(currentInstruction, kindsToBeAssigned, _numPreConditions, cg);
}
}
}
void OMR::X86::RegisterDependencyConditions::assignPostConditionRegisters(TR::Instruction *currentInstruction, TR_RegisterKinds kindsToBeAssigned, TR::CodeGenerator *cg)
{
if (_postConditions != NULL)
{
if ((kindsToBeAssigned & TR_X87_Mask))
{
_postConditions->assignFPRegisters(currentInstruction, kindsToBeAssigned, _numPostConditions, cg);
}
else
{
cg->clearRegisterAssignmentFlags();
cg->setRegisterAssignmentFlag(TR_PostDependencyCoercion);
_postConditions->assignRegisters(currentInstruction, kindsToBeAssigned, _numPostConditions, cg);
}
}
}
void OMR::X86::RegisterDependencyConditions::blockPreConditionRegisters()
{
_preConditions->blockRegisters(_numPreConditions);
}
void OMR::X86::RegisterDependencyConditions::unblockPreConditionRegisters()
{
_preConditions->unblockRegisters(_numPreConditions);
}
void OMR::X86::RegisterDependencyConditions::blockPostConditionRegisters()
{
_postConditions->blockRegisters(_numPostConditions);
}
void OMR::X86::RegisterDependencyConditions::unblockPostConditionRegisters()
{
_postConditions->unblockRegisters(_numPostConditions);
}
void OMR::X86::RegisterDependencyConditions::blockPostConditionRealDependencyRegisters(TR::CodeGenerator *cg)
{
_postConditions->blockRealDependencyRegisters(_numPostConditions, cg);
}
void OMR::X86::RegisterDependencyConditions::unblockPostConditionRealDependencyRegisters(TR::CodeGenerator *cg)
{
_postConditions->unblockRealDependencyRegisters(_numPostConditions, cg);
}
void OMR::X86::RegisterDependencyConditions::blockPreConditionRealDependencyRegisters(TR::CodeGenerator *cg)
{
_preConditions->blockRealDependencyRegisters(_numPreConditions, cg);
}
void OMR::X86::RegisterDependencyConditions::unblockPreConditionRealDependencyRegisters(TR::CodeGenerator *cg)
{
_preConditions->unblockRealDependencyRegisters(_numPreConditions, cg);
}
bool OMR::X86::RegisterDependencyConditions::refsRegister(TR::Register *r)
{
for (int i = 0; i < _numPreConditions; i++)
{
if (_preConditions->getRegisterDependency(i)->getRegister() == r &&
_preConditions->getRegisterDependency(i)->getRefsRegister())
{
return true;
}
}
for (int j = 0; j < _numPostConditions; j++)
{
if (_postConditions->getRegisterDependency(j)->getRegister() == r &&
_postConditions->getRegisterDependency(j)->getRefsRegister())
{
return true;
}
}
return false;
}
bool OMR::X86::RegisterDependencyConditions::defsRegister(TR::Register *r)
{
for (int i = 0; i < _numPreConditions; i++)
{
if (_preConditions->getRegisterDependency(i)->getRegister() == r &&
_preConditions->getRegisterDependency(i)->getDefsRegister())
{
return true;
}
}
for (int j = 0; j < _numPostConditions; j++)
{
if (_postConditions->getRegisterDependency(j)->getRegister() == r &&
_postConditions->getRegisterDependency(j)->getDefsRegister())
{
return true;
}
}
return false;
}
bool OMR::X86::RegisterDependencyConditions::usesRegister(TR::Register *r)
{
for (int i = 0; i < _numPreConditions; i++)
{
if (_preConditions->getRegisterDependency(i)->getRegister() == r &&
_preConditions->getRegisterDependency(i)->getUsesRegister())
{
return true;
}
}
for (int j = 0; j < _numPostConditions; j++)
{
if (_postConditions->getRegisterDependency(j)->getRegister() == r &&
_postConditions->getRegisterDependency(j)->getUsesRegister())
{
return true;
}
}
return false;
}
void OMR::X86::RegisterDependencyConditions::useRegisters(TR::Instruction *instr, TR::CodeGenerator *cg)
{
int32_t i;
for (i = 0; i < _numPreConditions; i++)
{
TR::Register *virtReg = _preConditions->getRegisterDependency(i)->getRegister();
if (virtReg)
{
instr->useRegister(virtReg);
}
}
for (i = 0; i < _numPostConditions; i++)
{
TR::Register *virtReg = _postConditions->getRegisterDependency(i)->getRegister();
if (virtReg)
{
instr->useRegister(virtReg);
}
}
}
void OMR::X86::RegisterDependencyGroup::blockRealDependencyRegisters(uint32_t numberOfRegisters, TR::CodeGenerator *cg)
{
TR::Machine *machine = cg->machine();
for (uint32_t i = 0; i < numberOfRegisters; i++)
{
if (!_dependencies[i].isNoReg())
{
machine->getRealRegister(_dependencies[i].getRealRegister())->block();
}
}
}
void OMR::X86::RegisterDependencyGroup::unblockRealDependencyRegisters(uint32_t numberOfRegisters, TR::CodeGenerator *cg)
{
TR::Machine *machine = cg->machine();
for (uint32_t i = 0; i < numberOfRegisters; i++)
{
if (!_dependencies[i].isNoReg())
{
machine->getRealRegister(_dependencies[i].getRealRegister())->unblock();
}
}
}
void OMR::X86::RegisterDependencyGroup::assignRegisters(TR::Instruction *currentInstruction,
TR_RegisterKinds kindsToBeAssigned,
uint32_t numberOfRegisters,
TR::CodeGenerator *cg)
{
TR::Register *virtReg = NULL;
TR::RealRegister *assignedReg = NULL;
TR::RealRegister::RegNum dependentRegNum = TR::RealRegister::NoReg;
TR::RealRegister *dependentRealReg = NULL;
TR::RealRegister *bestFreeRealReg = NULL;
TR::RealRegister::RegNum bestFreeRealRegIndex = TR::RealRegister::NoReg;
bool changed;
TR::Compilation *comp = cg->comp();
TR::Machine *machine = cg->machine();
self()->blockRegisters(numberOfRegisters);
// Build a work list of assignable register dependencies so the test does not
// have to be repeated on each pass. Also, order the list so that real
// associations appear first, followed by byte reg associations, followed by
// NoReg associations.
//
TR::RegisterDependency **dependencies =
(TR::RegisterDependency **)cg->trMemory()->allocateStackMemory(numberOfRegisters * sizeof(TR::RegisterDependency *));
bool hasByteDeps = false;
bool hasNoRegDeps = false;
bool hasBestFreeRegDeps = false;
int32_t numRealAssocRegisters;
int32_t numDependencyRegisters = 0;
int32_t firstByteRegAssoc = 0, lastByteRegAssoc = 0;
int32_t firstNoRegAssoc = 0, lastNoRegAssoc = 0;
int32_t bestFreeRegAssoc = 0;
for (auto i = 0U; i<numberOfRegisters; i++)
{
TR::RegisterDependency ®Dep = _dependencies[i];
virtReg = regDep.getRegister();
if (virtReg && (kindsToBeAssigned & virtReg->getKindAsMask())
&& !regDep.isNoReg()
&& !regDep.isByteReg()
&& !regDep.isSpilledReg()
&& !regDep.isBestFreeReg())
{
dependencies[numDependencyRegisters++] = self()->getRegisterDependency(i);
}
else if (regDep.isNoReg())
hasNoRegDeps = true;
else if (regDep.isByteReg())
hasByteDeps = true;
else if (regDep.isBestFreeReg())
hasBestFreeRegDeps = true;
// Handle spill registers first.
//
if (regDep.isSpilledReg())
{
if (cg->getUseNonLinearRegisterAssigner())
{
if (virtReg->getAssignedRegister())
{
TR_ASSERT(virtReg->getBackingStorage(), "should have a backing store for spilled reg virtuals");
assignedReg = toRealRegister(virtReg->getAssignedRegister());
TR::MemoryReference *tempMR = generateX86MemoryReference(virtReg->getBackingStorage()->getSymbolReference(), cg);
TR::InstOpCode::Mnemonic op;
if (assignedReg->getKind() == TR_FPR)
{
op = (assignedReg->isSinglePrecision()) ? TR::InstOpCode::MOVSSRegMem : (cg->getXMMDoubleLoadOpCode());
}
else if (assignedReg->getKind() == TR_VRF)
{
op = TR::InstOpCode::MOVDQURegMem;
}
else
{
op = TR::InstOpCode::LRegMem();
}
TR::X86RegMemInstruction *inst =
new (cg->trHeapMemory()) TR::X86RegMemInstruction(currentInstruction, op, assignedReg, tempMR, cg);
assignedReg->setAssignedRegister(NULL);
virtReg->setAssignedRegister(NULL);
assignedReg->setState(TR::RealRegister::Free);
if (comp->getOption(TR_TraceNonLinearRegisterAssigner))
{
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);
}
}
}
}
numRealAssocRegisters = numDependencyRegisters;
if (hasByteDeps)
{
firstByteRegAssoc = numDependencyRegisters;
for (auto i = 0U; i < numberOfRegisters; i++)
{
virtReg = _dependencies[i].getRegister();
if (virtReg && (kindsToBeAssigned & virtReg->getKindAsMask()) &&
_dependencies[i].isByteReg())
{
dependencies[numDependencyRegisters++] = self()->getRegisterDependency(i);
}
}
lastByteRegAssoc = numDependencyRegisters-1;
}
if (hasNoRegDeps)
{
firstNoRegAssoc = numDependencyRegisters;
for (auto i = 0U; i < numberOfRegisters; i++)
{
virtReg = _dependencies[i].getRegister();
if (virtReg && (kindsToBeAssigned & virtReg->getKindAsMask()) &&
_dependencies[i].isNoReg())
{
dependencies[numDependencyRegisters++] = self()->getRegisterDependency(i);
}
}
lastNoRegAssoc = numDependencyRegisters-1;
}
if (hasBestFreeRegDeps)
{
bestFreeRegAssoc = numDependencyRegisters;
for (auto i = 0U; i < numberOfRegisters; i++)
{
virtReg = _dependencies[i].getRegister();
if (virtReg && (kindsToBeAssigned & virtReg->getKindAsMask()) &&
_dependencies[i].isBestFreeReg())
{
dependencies[numDependencyRegisters++] = self()->getRegisterDependency(i);
}
}
TR_ASSERT((bestFreeRegAssoc == numDependencyRegisters-1), "there can only be one bestFreeRegDep in a dependency list");
}
// First look for long shot where two registers can be xchg'ed into their
// proper real registers in one shot (seems to happen more often than one would think)
//
if (numRealAssocRegisters > 1)
{
for (auto i = 0; i < numRealAssocRegisters - 1; i++)
{
virtReg = dependencies[i]->getRegister();
// We can only perform XCHG on GPRs.
//
if (virtReg->getKind() == TR_GPR)
{
dependentRegNum = dependencies[i]->getRealRegister();
dependentRealReg = machine->getRealRegister(dependentRegNum);
assignedReg = NULL;
TR::RealRegister::RegNum assignedRegNum = TR::RealRegister::NoReg;
if (virtReg->getAssignedRegister())
{
assignedReg = toRealRegister(virtReg->getAssignedRegister());
assignedRegNum = assignedReg->getRegisterNumber();
}
if (dependentRealReg->getState() == TR::RealRegister::Blocked &&
dependentRegNum != assignedRegNum)
{
for (auto j = i + 1; j < numRealAssocRegisters; j++)
{
TR::Register *virtReg2 = dependencies[j]->getRegister();
TR::RealRegister::RegNum dependentRegNum2 = dependencies[j]->getRealRegister();
TR::RealRegister *assignedReg2 = NULL;
TR::RealRegister::RegNum assignedRegNum2 = TR::RealRegister::NoReg;
if (virtReg2 && virtReg2->getAssignedRegister())
{
assignedReg2 = toRealRegister(virtReg2->getAssignedRegister());
assignedRegNum2 = assignedReg2->getRegisterNumber();
}
if (assignedRegNum2 == dependentRegNum &&
assignedRegNum == dependentRegNum2)
{
machine->swapGPRegisters(currentInstruction, assignedRegNum, assignedRegNum2);
break;
}
}
}
}
}
}
// Next find registers for which there is an identified real register
// and that register is currently free. Want to do these first to get these
// registers out of their existing registers and possibly freeing those registers
// up to also be filled by the proper candidates as simply as possible
//
do
{
changed = false;
for (auto i = 0; i < numRealAssocRegisters; i++)
{
virtReg = dependencies[i]->getRegister();
dependentRegNum = dependencies[i]->getRealRegister();
dependentRealReg = machine->getRealRegister(dependentRegNum);
if (dependentRealReg->getState() == TR::RealRegister::Free)
{
if (virtReg->getKind() == TR_FPR || virtReg->getKind() == TR_VRF)
machine->coerceXMMRegisterAssignment(currentInstruction, virtReg, dependentRegNum);
else
machine->coerceGPRegisterAssignment(currentInstruction, virtReg, dependentRegNum);
virtReg->block();
changed = true;
}
}
} while (changed);
// Next find registers for which there is an identified real register, but the
// register is not yet assigned. We could do this at the same time as the previous
// loop, but that could lead to some naive changes that would have been easier once
// all the opportunities found by the first loop have been found.
//
do
{
changed = false;
for (auto i = 0; i < numRealAssocRegisters; i++)
{
virtReg = dependencies[i]->getRegister();
assignedReg = toRealRegister(virtReg->getAssignedRealRegister());
dependentRegNum = dependencies[i]->getRealRegister();
dependentRealReg = machine->getRealRegister(dependentRegNum);
if (dependentRealReg != assignedReg)
{
if (virtReg->getKind() == TR_FPR || virtReg->getKind() == TR_VRF)
machine->coerceXMMRegisterAssignment(currentInstruction, virtReg, dependentRegNum);
else
machine->coerceGPRegisterAssignment(currentInstruction, virtReg, dependentRegNum);
virtReg->block();
changed = true;
}
}
} while (changed);
// Now all virtual registers which require a particular real register should
// be in that register, so now find registers for which there is no required
// real assignment, but which are not currently assigned to a real register
// and make sure they are assigned.
//
// Assign byte register dependencies first. Unblock any NoReg dependencies to not
// constrain the byte register choices.
//
if (hasByteDeps)
{
if (hasNoRegDeps)
{
for (auto i = firstNoRegAssoc; i <= lastNoRegAssoc; i++)
dependencies[i]->getRegister()->unblock();
}
do
{
changed = false;
for (auto i = firstByteRegAssoc; i <= lastByteRegAssoc; i++)
{
virtReg = dependencies[i]->getRegister();
if (toRealRegister(virtReg->getAssignedRealRegister()) == NULL)
{
machine->coerceGPRegisterAssignment(currentInstruction, virtReg, TR_ByteReg);
virtReg->block();
changed = true;
}
}
} while (changed);
if (hasNoRegDeps)
{
for (auto i = firstNoRegAssoc; i <= lastNoRegAssoc; i++)
dependencies[i]->getRegister()->block();
}
}
// Assign the remaining NoReg dependencies.
//