void decFutureUseCounts(uint32_t numberOfRegisters,
TR::CodeGenerator *cg)
{
for (uint32_t i = 0; i< numberOfRegisters; i++)
{
TR::Register *virtReg = _dependencies[i].getRegister();
virtReg->decFutureUseCount();
}
}
void TR_ARMRegisterDependencyGroup::assignRegisters(TR::Instruction *currentInstruction,
TR_RegisterKinds kindToBeAssigned,
uint32_t numberOfRegisters,
TR::CodeGenerator *cg)
{
TR::Compilation *comp = cg->comp();
TR::Machine *machine = cg->machine();
TR::Register *virtReg;
TR::RealRegister::RegNum dependentRegNum;
TR::RealRegister *dependentRealReg, *assignedRegister;
uint32_t i, j;
bool changed;
if (!comp->getOption(TR_DisableOOL))
{
for (i = 0; i< numberOfRegisters; i++)
{
virtReg = dependencies[i].getRegister();
dependentRegNum = dependencies[i].getRealRegister();
if (dependentRegNum == TR::RealRegister::SpilledReg)
{
TR_ASSERT(virtReg->getBackingStorage(),"should have a backing store if dependentRegNum == spillRegIndex()\n");
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
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 = new (cg->trHeapMemory()) TR::MemoryReference(currentNode, (TR::SymbolReference*)virtReg->getBackingStorage()->getSymbolReference(), sizeof(uintptr_t), cg);
TR_ARMOpCodes opCode;
TR_RegisterKinds rk = virtReg->getKind();
switch (rk)
{
case TR_GPR:
opCode = ARMOp_ldr;
break;
case TR_FPR:
opCode = virtReg->isSinglePrecision() ? ARMOp_ldfs : ARMOp_ldfd;
break;
default:
TR_ASSERT(0, "\nRegister kind not supported in OOL spill\n");
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", cg->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);
}
// we also need to free up all locked backing storage if we are exiting the OOL during backwards RA assignment
else if (currentInstruction->isLabel() && virtReg->getAssignedRealRegister())
{
TR::ARMLabelInstruction *labelInstr = (TR::ARMLabelInstruction *)currentInstruction;
TR_BackingStore *location = virtReg->getBackingStorage();
TR_RegisterKinds rk = virtReg->getKind();
int32_t dataSize;
if (labelInstr->getLabelSymbol()->isStartOfColdInstructionStream() && location)
{
traceMsg (comp,"\nOOL: Releasing backing storage (%p)\n", location);
if (rk == TR_GPR)
dataSize = TR::Compiler->om.sizeofReferenceAddress();
else
dataSize = 8;
location->setMaxSpillDepth(0);
cg->freeSpill(location,dataSize,0);
virtReg->setBackingStorage(NULL);
}
}
}
}
for (i = 0; i < numberOfRegisters; i++)
{
virtReg = dependencies[i].getRegister();
if (virtReg->getAssignedRealRegister()!=NULL)
{
if (dependencies[i].getRealRegister() == TR::RealRegister::NoReg)
{
virtReg->block();
}
else
{
dependentRegNum = toRealRegister(virtReg->getAssignedRealRegister())->getRegisterNumber();
for (j=0; j<numberOfRegisters; j++)
{
if (dependentRegNum == dependencies[j].getRealRegister())
{
virtReg->block();
break;
}
}
}
}
}
do
{
changed = false;
for (i = 0; i < numberOfRegisters; i++)
{
virtReg = dependencies[i].getRegister();
dependentRegNum = dependencies[i].getRealRegister();
dependentRealReg = machine->getRealRegister(dependentRegNum);
if (dependentRegNum != TR::RealRegister::NoReg &&
dependentRegNum != TR::RealRegister::SpilledReg &&
dependentRealReg->getState() == TR::RealRegister::Free)
{
machine->coerceRegisterAssignment(currentInstruction, virtReg, dependentRegNum);
virtReg->block();
changed = true;
}
}
} while (changed == true);
do
{
changed = false;
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 (dependentRegNum != TR::RealRegister::NoReg &&
dependentRegNum != TR::RealRegister::SpilledReg &&
dependentRealReg != assignedRegister)
{
machine->coerceRegisterAssignment(currentInstruction, virtReg, dependentRegNum);
virtReg->block();
changed = true;
}
}
} while (changed == true);
for (i=0; i<numberOfRegisters; i++)
{
if (dependencies[i].getRealRegister() == TR::RealRegister::NoReg)
{
bool excludeGPR0 = dependencies[i].getExcludeGPR0()?true:false;
TR::RealRegister *realOne;
virtReg = dependencies[i].getRegister();
realOne = virtReg->getAssignedRealRegister();
if (realOne!=NULL && excludeGPR0 && toRealRegister(realOne)->getRegisterNumber()==TR::RealRegister::gr0)
{
if ((assignedRegister = machine->findBestFreeRegister(virtReg->getKind(), true)) == NULL)
{
assignedRegister = machine->freeBestRegister(currentInstruction, virtReg->getKind(), NULL, true);
}
machine->coerceRegisterAssignment(currentInstruction, virtReg, assignedRegister->getRegisterNumber());
}
else if (realOne == NULL)
{
if (virtReg->getTotalUseCount() == virtReg->getFutureUseCount())
{
if ((assignedRegister = machine->findBestFreeRegister(virtReg->getKind(), excludeGPR0, true)) == NULL)
{
assignedRegister = machine->freeBestRegister(currentInstruction, virtReg->getKind(), NULL, excludeGPR0);
}
}
else
{
assignedRegister = machine->reverseSpillState(currentInstruction, virtReg, NULL, excludeGPR0);
}
virtReg->setAssignedRegister(assignedRegister);
assignedRegister->setAssignedRegister(virtReg);
assignedRegister->setState(TR::RealRegister::Assigned);
virtReg->block();
}
}
}
unblockRegisters(numberOfRegisters);
for (i = 0; i < numberOfRegisters; i++)
{
TR::Register *dependentRegister = getRegisterDependency(i)->getRegister();
if (dependentRegister->getAssignedRegister())
{
TR::RealRegister *assignedRegister = dependentRegister->getAssignedRegister()->getRealRegister();
if (getRegisterDependency(i)->getRealRegister() == TR::RealRegister::NoReg)
getRegisterDependency(i)->setRealRegister(toRealRegister(assignedRegister)->getRegisterNumber());
if (dependentRegister->decFutureUseCount() == 0)
{
dependentRegister->setAssignedRegister(NULL);
assignedRegister->setAssignedRegister(NULL);
assignedRegister->setState(TR::RealRegister::Unlatched); // Was setting to Free
}
}
}
}