void HexagonHazardRecognizer::EmitInstruction(SUnit *SU) {
MachineInstr *MI = SU->getInstr();
if (!MI)
return;
// Keep the set of definitions for each packet, which is used to determine
// if a .new can be used.
for (const MachineOperand &MO : MI->operands())
if (MO.isReg() && MO.isDef() && !MO.isImplicit())
RegDefs.insert(MO.getReg());
if (TII->isZeroCost(MI->getOpcode()))
return;
if (!Resources->canReserveResources(*MI)) {
// It must be a .new store since other instructions must be able to be
// reserved at this point.
assert(TII->mayBeNewStore(*MI) && "Expecting .new store");
MachineFunction *MF = MI->getParent()->getParent();
MachineInstr *NewMI =
MF->CreateMachineInstr(TII->get(TII->getDotNewOp(*MI)),
MI->getDebugLoc());
assert(Resources->canReserveResources(*NewMI));
Resources->reserveResources(*NewMI);
MF->DeleteMachineInstr(NewMI);
}
else
Resources->reserveResources(*MI);
LLVM_DEBUG(dbgs() << " Add instruction " << *MI);
// When scheduling a dot cur instruction, check if there is an instruction
// that can use the dot cur in the same packet. If so, we'll attempt to
// schedule it before other instructions. We only do this if the load has a
// single zero-latency use.
if (TII->mayBeCurLoad(*MI))
for (auto &S : SU->Succs)
if (S.isAssignedRegDep() && S.getLatency() == 0 &&
S.getSUnit()->NumPredsLeft == 1) {
UsesDotCur = S.getSUnit();
DotCurPNum = PacketNum;
break;
}
if (SU == UsesDotCur) {
UsesDotCur = nullptr;
DotCurPNum = -1;
}
UsesLoad = MI->mayLoad();
if (TII->isHVXVec(*MI) && !MI->mayLoad() && !MI->mayStore())
for (auto &S : SU->Succs)
if (S.isAssignedRegDep() && S.getLatency() == 0 &&
TII->mayBeNewStore(*S.getSUnit()->getInstr()) &&
Resources->canReserveResources(*S.getSUnit()->getInstr())) {
PrefVectorStoreNew = S.getSUnit();
break;
}
}
ScheduleHazardRecognizer::HazardType
HexagonHazardRecognizer::getHazardType(SUnit *SU, int stalls) {
MachineInstr *MI = SU->getInstr();
if (!MI || TII->isZeroCost(MI->getOpcode()))
return NoHazard;
if (!Resources->canReserveResources(*MI)) {
LLVM_DEBUG(dbgs() << "*** Hazard in cycle " << PacketNum << ", " << *MI);
HazardType RetVal = Hazard;
if (TII->mayBeNewStore(*MI)) {
// Make sure the register to be stored is defined by an instruction in the
// packet.
MachineOperand &MO = MI->getOperand(MI->getNumOperands() - 1);
if (!MO.isReg() || RegDefs.count(MO.getReg()) == 0)
return Hazard;
// The .new store version uses different resources so check if it
// causes a hazard.
MachineFunction *MF = MI->getParent()->getParent();
MachineInstr *NewMI =
MF->CreateMachineInstr(TII->get(TII->getDotNewOp(*MI)),
MI->getDebugLoc());
if (Resources->canReserveResources(*NewMI))
RetVal = NoHazard;
LLVM_DEBUG(dbgs() << "*** Try .new version? " << (RetVal == NoHazard)
<< "\n");
MF->DeleteMachineInstr(NewMI);
}
return RetVal;
}
if (SU == UsesDotCur && DotCurPNum != (int)PacketNum) {
LLVM_DEBUG(dbgs() << "*** .cur Hazard in cycle " << PacketNum << ", "
<< *MI);
return Hazard;
}
return NoHazard;
}
