bool
LiveRangeAllocator<VREG>::init()
{
if (!RegisterAllocator::init())
return false;
liveIn = lir->mir()->allocate<BitSet*>(graph.numBlockIds());
if (!liveIn)
return false;
// Initialize fixed intervals.
for (size_t i = 0; i < AnyRegister::Total; i++) {
AnyRegister reg = AnyRegister::FromCode(i);
LiveInterval *interval = new LiveInterval(0);
interval->setAllocation(LAllocation(reg));
fixedIntervals[i] = interval;
}
fixedIntervalsUnion = new LiveInterval(0);
if (!vregs.init(lir->mir(), graph.numVirtualRegisters()))
return false;
// Build virtual register objects
for (size_t i = 0; i < graph.numBlocks(); i++) {
if (mir->shouldCancel("LSRA create data structures (main loop)"))
return false;
LBlock *block = graph.getBlock(i);
for (LInstructionIterator ins = block->begin(); ins != block->end(); ins++) {
for (size_t j = 0; j < ins->numDefs(); j++) {
LDefinition *def = ins->getDef(j);
if (def->policy() != LDefinition::PASSTHROUGH) {
uint32_t reg = def->virtualRegister();
if (!vregs[reg].init(reg, block, *ins, def, /* isTemp */ false))
return false;
}
}
for (size_t j = 0; j < ins->numTemps(); j++) {
LDefinition *def = ins->getTemp(j);
if (def->isBogusTemp())
continue;
if (!vregs[def].init(def->virtualRegister(), block, *ins, def, /* isTemp */ true))
return false;
}
}
for (size_t j = 0; j < block->numPhis(); j++) {
LPhi *phi = block->getPhi(j);
LDefinition *def = phi->getDef(0);
if (!vregs[def].init(phi->id(), block, phi, def, /* isTemp */ false))
return false;
}
}
return true;
}
bool
StupidAllocator::init()
{
if (!RegisterAllocator::init())
return false;
if (!virtualRegisters.reserve(graph.numVirtualRegisters()))
return false;
for (size_t i = 0; i < graph.numVirtualRegisters(); i++)
virtualRegisters.infallibleAppend(NULL);
for (size_t i = 0; i < graph.numBlocks(); i++) {
LBlock *block = graph.getBlock(i);
for (LInstructionIterator ins = block->begin(); ins != block->end(); ins++) {
for (size_t j = 0; j < ins->numDefs(); j++) {
LDefinition *def = ins->getDef(j);
if (def->policy() != LDefinition::PASSTHROUGH)
virtualRegisters[def->virtualRegister()] = def;
}
for (size_t j = 0; j < ins->numTemps(); j++) {
LDefinition *def = ins->getTemp(j);
if (def->isBogusTemp())
continue;
virtualRegisters[def->virtualRegister()] = def;
}
}
for (size_t j = 0; j < block->numPhis(); j++) {
LPhi *phi = block->getPhi(j);
LDefinition *def = phi->getDef(0);
uint32 vreg = def->virtualRegister();
virtualRegisters[vreg] = def;
}
}
// Assign physical registers to the tracked allocation.
{
registerCount = 0;
RegisterSet remainingRegisters(allRegisters_);
while (!remainingRegisters.empty(/* float = */ false))
registers[registerCount++].reg = AnyRegister(remainingRegisters.takeGeneral());
while (!remainingRegisters.empty(/* float = */ true))
registers[registerCount++].reg = AnyRegister(remainingRegisters.takeFloat());
JS_ASSERT(registerCount <= MAX_REGISTERS);
}
return true;
}
bool
StupidAllocator::init()
{
if (!RegisterAllocator::init())
return false;
if (!virtualRegisters.appendN((LDefinition*)nullptr, graph.numVirtualRegisters()))
return false;
for (size_t i = 0; i < graph.numBlocks(); i++) {
LBlock* block = graph.getBlock(i);
for (LInstructionIterator ins = block->begin(); ins != block->end(); ins++) {
for (size_t j = 0; j < ins->numDefs(); j++) {
LDefinition* def = ins->getDef(j);
virtualRegisters[def->virtualRegister()] = def;
}
for (size_t j = 0; j < ins->numTemps(); j++) {
LDefinition* def = ins->getTemp(j);
if (def->isBogusTemp())
continue;
virtualRegisters[def->virtualRegister()] = def;
}
}
for (size_t j = 0; j < block->numPhis(); j++) {
LPhi* phi = block->getPhi(j);
LDefinition* def = phi->getDef(0);
uint32_t vreg = def->virtualRegister();
virtualRegisters[vreg] = def;
}
}
// Assign physical registers to the tracked allocation.
{
registerCount = 0;
LiveRegisterSet remainingRegisters(allRegisters_.asLiveSet());
while (!remainingRegisters.emptyGeneral())
registers[registerCount++].reg = AnyRegister(remainingRegisters.takeAnyGeneral());
while (!remainingRegisters.emptyFloat())
registers[registerCount++].reg = AnyRegister(remainingRegisters.takeAnyFloat());
MOZ_ASSERT(registerCount <= MAX_REGISTERS);
}
return true;
}