void LinearScan::preAllocSpillLoc(uint32_t numSpillLocs) {
for (Block* block : m_blocks) {
for (IRInstruction& inst : *block) {
if (inst.getOpcode() == Spill) {
SSATmp* dst = inst.getDst();
for (int index = 0; index < dst->numNeededRegs(); ++index) {
assert(!dst->hasReg(index));
if (dst->getSpillInfo(index).type() == SpillInfo::Memory) {
uint32_t spillLoc = dst->getSpillInfo(index).mem();
// Native stack layout:
// | |
// +---------------+
// | | <-- spill[5..]
// | pre allocated | <-- spill[4]
// | (16 slots) | <-- spill[3]
// +---------------+
// | return addr |
// +---------------+
// | extra | <-- spill[2]
// | spill | <-- spill[1]
// | locations | <-- spill[0]
// +---------------+ <-- %rsp
// If a spill location falls into the pre-allocated region, we
// need to increase its index by 1 to avoid overwriting the
// return address.
if (spillLoc + NumPreAllocatedSpillLocs >= numSpillLocs) {
dst->setSpillInfo(index, SpillInfo(spillLoc + 1));
}
}
}
}
}
}
}
void LinearScan::preAllocSpillLocAux(Trace* trace, uint32 numSpillLocs) {
IRInstruction::List& instList = trace->getInstructionList();
for (IRInstruction::Iterator it = instList.begin();
it != instList.end();
++it) {
IRInstruction* inst = *it;
if (inst->getOpcode() == Spill) {
SSATmp* dst = inst->getDst();
for (int index = 0; index < dst->numNeededRegs(); ++index) {
ASSERT(!dst->hasReg(index));
if (dst->getSpillInfo(index).type() == SpillInfo::Memory) {
uint32 spillLoc = dst->getSpillInfo(index).mem();
// Native stack layout:
// | |
// +---------------+
// | | <-- spill[5..]
// | pre allocated | <-- spill[4]
// | (16 slots) | <-- spill[3]
// +---------------+
// | return addr |
// +---------------+
// | extra | <-- spill[2]
// | spill | <-- spill[1]
// | locations | <-- spill[0]
// +---------------+ <-- %rsp
// If a spill location falls into the pre-allocated region, we
// need to increase its index by 1 to avoid overwriting the
// return address.
if (spillLoc + NumPreAllocatedSpillLocs >= numSpillLocs) {
dst->setSpillInfo(index, SpillInfo(spillLoc + 1));
}
}
}
}
}
}
