bool TargetInstrInfo::hasLowDefLatency(const TargetSchedModel &SchedModel,
const MachineInstr *DefMI,
unsigned DefIdx) const {
const InstrItineraryData *ItinData = SchedModel.getInstrItineraries();
if (!ItinData || ItinData->isEmpty())
return false;
unsigned DefClass = DefMI->getDesc().getSchedClass();
int DefCycle = ItinData->getOperandCycle(DefClass, DefIdx);
return (DefCycle != -1 && DefCycle <= 1);
}
/// Returns string representation of scheduler comment
std::string TargetSubtargetInfo::getSchedInfoStr(MCInst const &MCI) const {
// We don't cache TSchedModel because it depends on TargetInstrInfo
// that could be changed during the compilation
TargetSchedModel TSchedModel;
TSchedModel.init(this);
unsigned Latency;
if (TSchedModel.hasInstrSchedModel())
Latency = TSchedModel.computeInstrLatency(MCI);
else if (TSchedModel.hasInstrItineraries()) {
auto *ItinData = TSchedModel.getInstrItineraries();
Latency = ItinData->getStageLatency(
getInstrInfo()->get(MCI.getOpcode()).getSchedClass());
} else
return std::string();
Optional<double> RThroughput =
TSchedModel.computeReciprocalThroughput(MCI);
return createSchedInfoStr(Latency, RThroughput);
}