+/// \brief Gets latency information for \p Inst form the itinerary
+/// scheduling model, based on \p DC information.
+/// \return The maximum expected latency over all the operands or -1
+/// if no information are available.
+static int getItineraryLatency(LLVMDisasmContext *DC, const MCInst &Inst) {
+ const int NoInformationAvailable = -1;
+
+ // Check if we have a CPU to get the itinerary information.
+ if (DC->getCPU().empty())
+ return NoInformationAvailable;
+
+ // Get itinerary information.
+ const MCSubtargetInfo *STI = DC->getSubtargetInfo();
+ InstrItineraryData IID = STI->getInstrItineraryForCPU(DC->getCPU());
+ // Get the scheduling class of the requested instruction.
+ const MCInstrDesc& Desc = DC->getInstrInfo()->get(Inst.getOpcode());
+ unsigned SCClass = Desc.getSchedClass();
+
+ int Latency = 0;
+ for (unsigned OpIdx = 0, OpIdxEnd = Inst.getNumOperands(); OpIdx != OpIdxEnd;
+ ++OpIdx)
+ Latency = std::max(Latency, IID.getOperandCycle(SCClass, OpIdx));
+
+ return Latency;
+}
+