/// Return true if this machine model includes an instruction-level scheduling
/// model. This is more detailed than the course grain IssueWidth and default
/// latency properties, but separate from the per-cycle itinerary data.
- bool hasInstrSchedModel() const {
- return SchedModel.hasInstrSchedModel();
- }
+ bool hasInstrSchedModel() const { return SchedModel.hasInstrSchedModel(); }
/// Return true if this machine model includes cycle-to-cycle itinerary
/// data. This models scheduling at each stage in the processor pipeline.
- bool hasInstrItineraries() const {
- return SchedModel.hasInstrItineraries();
- }
+ bool hasInstrItineraries() const { return !InstrItins.isEmpty(); }
+
+ /// computeOperandLatency - Compute and return the latency of the given data
+ /// dependent def and use when the operand indices are already known. UseMI
+ /// may be NULL for an unknown user.
+ ///
+ /// FindMin may be set to get the minimum vs. expected latency. Minimum
+ /// latency is used for scheduling groups, while expected latency is for
+ /// instruction cost and critical path.
+ unsigned computeOperandLatency(const MachineInstr *DefMI, unsigned DefOperIdx,
+ const MachineInstr *UseMI, unsigned UseOperIdx,
+ bool FindMin) const;
unsigned getProcessorID() const { return SchedModel.getProcessorID(); }
+
+private:
+ /// getDefLatency is a helper for computeOperandLatency. Return the
+ /// instruction's latency if operand lookup is not required.
+ /// Otherwise return -1.
+ int getDefLatency(const MachineInstr *DefMI, bool FindMin) const;
+
+ /// Return the MCSchedClassDesc for this instruction.
+ const MCSchedClassDesc *resolveSchedClass(const MachineInstr *MI) const;
};
} // namespace llvm