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📄 AccelTable.h(13.54 KB)
📄 Analysis.h(6.04 KB)
📄 AntiDepBreaker.h(3.78 KB)
📄 AsmPrinter.h(27.35 KB)
📄 AsmPrinterHandler.h(2.6 KB)
📄 AtomicExpandUtils.h(2.49 KB)
📄 BasicTTIImpl.h(73.64 KB)
📄 BuiltinGCs.h(1008 B)
📄 CSEConfigBase.h(1.09 KB)
📄 CalcSpillWeights.h(4.69 KB)
📄 CallingConvLower.h(21 KB)
📄 CommandFlags.h(3.65 KB)
📄 CostTable.h(1.87 KB)
📄 DAGCombine.h(606 B)
📄 DFAPacketizer.h(7.47 KB)
📄 DIE.h(32.19 KB)
📄 DIEValue.def(1.4 KB)
📄 DbgEntityHistoryCalculator.h(4.37 KB)
📄 DebugHandlerBase.h(4.68 KB)
📄 DwarfStringPoolEntry.h(2.18 KB)
📄 EdgeBundles.h(2.13 KB)
📄 ExecutionDomainFix.h(7.72 KB)
📄 ExpandReductions.h(726 B)
📄 FastISel.h(22.87 KB)
📄 FaultMaps.h(6.66 KB)
📄 FunctionLoweringInfo.h(9.68 KB)
📄 GCMetadata.h(7.24 KB)
📄 GCMetadataPrinter.h(2.46 KB)
📄 GCStrategy.h(5.25 KB)
📁 GlobalISel
📄 ISDOpcodes.h(52.75 KB)
📄 IndirectThunks.h(3.85 KB)
📄 IntrinsicLowering.h(1.67 KB)
📄 LatencyPriorityQueue.h(3.09 KB)
📄 LazyMachineBlockFrequencyInfo.h(2.82 KB)
📄 LexicalScopes.h(10.06 KB)
📄 LinkAllAsmWriterComponents.h(1.34 KB)
📄 LinkAllCodegenComponents.h(2.18 KB)
📄 LiveInterval.h(37.24 KB)
📄 LiveIntervalCalc.h(2.91 KB)
📄 LiveIntervalUnion.h(6.93 KB)
📄 LiveIntervals.h(19.86 KB)
📄 LivePhysRegs.h(7.51 KB)
📄 LiveRangeCalc.h(11.49 KB)
📄 LiveRangeEdit.h(10.45 KB)
📄 LiveRegMatrix.h(6.18 KB)
📄 LiveRegUnits.h(6.24 KB)
📄 LiveStacks.h(3.35 KB)
📄 LiveVariables.h(12.98 KB)
📄 LoopTraversal.h(4.38 KB)
📄 LowLevelType.h(1.28 KB)
📄 MBFIWrapper.h(1.58 KB)
📄 MIRFormatter.h(3.13 KB)
📁 MIRParser
📄 MIRPrinter.h(1.73 KB)
📄 MIRYamlMapping.h(23.95 KB)
📄 MachORelocation.h(2.19 KB)
📄 MachineBasicBlock.h(42.95 KB)
📄 MachineBlockFrequencyInfo.h(3.21 KB)
📄 MachineBranchProbabilityInfo.h(2.69 KB)
📄 MachineCombinerPattern.h(3.5 KB)
📄 MachineConstantPool.h(5.25 KB)
📄 MachineDominanceFrontier.h(2.93 KB)
📄 MachineDominators.h(9.59 KB)
📄 MachineFrameInfo.h(34.84 KB)
📄 MachineFunction.h(42.94 KB)
📄 MachineFunctionPass.h(2.93 KB)
📄 MachineInstr.h(73.72 KB)
📄 MachineInstrBuilder.h(22.84 KB)
📄 MachineInstrBundle.h(10.16 KB)
📄 MachineInstrBundleIterator.h(10.92 KB)
📄 MachineJumpTableInfo.h(4.66 KB)
📄 MachineLoopInfo.h(7.3 KB)
📄 MachineLoopUtils.h(1.74 KB)
📄 MachineMemOperand.h(12.69 KB)
📄 MachineModuleInfo.h(9.88 KB)
📄 MachineModuleInfoImpls.h(3.36 KB)
📄 MachineOperand.h(37.64 KB)
📄 MachineOptimizationRemarkEmitter.h(8.99 KB)
📄 MachineOutliner.h(8.04 KB)
📄 MachinePassRegistry.h(6.1 KB)
📄 MachinePipeliner.h(21.17 KB)
📄 MachinePostDominators.h(2.93 KB)
📄 MachineRegionInfo.h(5.93 KB)
📄 MachineRegisterInfo.h(46.75 KB)
📄 MachineSSAUpdater.h(4.37 KB)
📄 MachineScheduler.h(36.6 KB)
📄 MachineSizeOpts.h(1.86 KB)
📄 MachineTraceMetrics.h(17.17 KB)
📄 MacroFusion.h(1.96 KB)
📄 ModuloSchedule.h(15.8 KB)
📄 NonRelocatableStringpool.h(2.9 KB)
📁 PBQP
📄 PBQPRAConstraint.h(1.83 KB)
📄 ParallelCG.h(1.66 KB)
📄 Passes.h(18.96 KB)
📄 PreISelIntrinsicLowering.h(944 B)
📄 PseudoSourceValue.h(6.21 KB)
📄 RDFGraph.h(33.73 KB)
📄 RDFLiveness.h(5.01 KB)
📄 RDFRegisters.h(6.51 KB)
📄 ReachingDefAnalysis.h(10.68 KB)
📄 RegAllocPBQP.h(16.47 KB)
📄 RegAllocRegistry.h(2.27 KB)
📄 Register.h(5.61 KB)
📄 RegisterClassInfo.h(4.86 KB)
📄 RegisterPressure.h(21.04 KB)
📄 RegisterScavenging.h(8.73 KB)
📄 RegisterUsageInfo.h(2.3 KB)
📄 ResourcePriorityQueue.h(4.19 KB)
📄 RuntimeLibcalls.h(3.05 KB)
📄 SDNodeProperties.td(1.57 KB)
📄 ScheduleDAG.h(28.92 KB)
📄 ScheduleDAGInstrs.h(15.49 KB)
📄 ScheduleDAGMutation.h(1021 B)
📄 ScheduleDFS.h(5.79 KB)
📄 ScheduleHazardRecognizer.h(4.65 KB)
📄 SchedulerRegistry.h(4.27 KB)
📄 ScoreboardHazardRecognizer.h(3.7 KB)
📄 SelectionDAG.h(89.12 KB)
📄 SelectionDAGAddressAnalysis.h(3.58 KB)
📄 SelectionDAGISel.h(13.48 KB)
📄 SelectionDAGNodes.h(91.77 KB)
📄 SelectionDAGTargetInfo.h(7.99 KB)
📄 SlotIndexes.h(24.12 KB)
📄 Spiller.h(1.16 KB)
📄 StackMaps.h(11.45 KB)
📄 StackProtector.h(4.1 KB)
📄 SwiftErrorValueTracking.h(3.87 KB)
📄 SwitchLoweringUtils.h(9.51 KB)
📄 TailDuplicator.h(5.54 KB)
📄 TargetCallingConv.h(8.26 KB)
📄 TargetFrameLowering.h(19.21 KB)
📄 TargetInstrInfo.h(84.48 KB)
📄 TargetLowering.h(194.17 KB)
📄 TargetLoweringObjectFileImpl.h(11.63 KB)
📄 TargetOpcodes.h(1.37 KB)
📄 TargetPassConfig.h(17.9 KB)
📄 TargetRegisterInfo.h(48.65 KB)
📄 TargetSchedule.h(7.75 KB)
📄 TargetSubtargetInfo.h(12.53 KB)
📄 UnreachableBlockElim.h(1.39 KB)
📄 ValueTypes.h(17.2 KB)
📄 ValueTypes.td(11.42 KB)
📄 VirtRegMap.h(6.37 KB)
📄 WasmEHFuncInfo.h(1.92 KB)
📄 WinEHFuncInfo.h(4.01 KB)

Editing: DFAPacketizer.h

//===- llvm/CodeGen/DFAPacketizer.h - DFA Packetizer for VLIW ---*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// This class implements a deterministic finite automaton (DFA) based
// packetizing mechanism for VLIW architectures. It provides APIs to
// determine whether there exists a legal mapping of instructions to
// functional unit assignments in a packet. The DFA is auto-generated from
// the target's Schedule.td file.
//
// A DFA consists of 3 major elements: states, inputs, and transitions. For
// the packetizing mechanism, the input is the set of instruction classes for
// a target. The state models all possible combinations of functional unit
// consumption for a given set of instructions in a packet. A transition
// models the addition of an instruction to a packet. In the DFA constructed
// by this class, if an instruction can be added to a packet, then a valid
// transition exists from the corresponding state. Invalid transitions
// indicate that the instruction cannot be added to the current packet.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_CODEGEN_DFAPACKETIZER_H
#define LLVM_CODEGEN_DFAPACKETIZER_H

#include "llvm/ADT/DenseMap.h"
#include "llvm/CodeGen/MachineBasicBlock.h"
#include "llvm/CodeGen/ScheduleDAGMutation.h"
#include "llvm/Support/Automaton.h"
#include <cstdint>
#include <map>
#include <memory>
#include <utility>
#include <vector>

namespace llvm {

class DefaultVLIWScheduler;
class InstrItineraryData;
class MachineFunction;
class MachineInstr;
class MachineLoopInfo;
class MCInstrDesc;
class SUnit;
class TargetInstrInfo;

class DFAPacketizer {
private:
  const InstrItineraryData *InstrItins;
  Automaton<uint64_t> A;
  /// For every itinerary, an "action" to apply to the automaton. This removes
  /// the redundancy in actions between itinerary classes.
  ArrayRef<unsigned> ItinActions;

public:
  DFAPacketizer(const InstrItineraryData *InstrItins, Automaton<uint64_t> a,
                ArrayRef<unsigned> ItinActions)
      : InstrItins(InstrItins), A(std::move(a)), ItinActions(ItinActions) {
    // Start off with resource tracking disabled.
    A.enableTranscription(false);
  }

// Reset the current state to make all resources available.
  void clearResources() {
    A.reset();
  }

// Set whether this packetizer should track not just whether instructions
  // can be packetized, but also which functional units each instruction ends up
  // using after packetization.
  void setTrackResources(bool Track) {
    A.enableTranscription(Track);
  }

// Check if the resources occupied by a MCInstrDesc are available in
  // the current state.
  bool canReserveResources(const MCInstrDesc *MID);

// Reserve the resources occupied by a MCInstrDesc and change the current
  // state to reflect that change.
  void reserveResources(const MCInstrDesc *MID);

// Check if the resources occupied by a machine instruction are available
  // in the current state.
  bool canReserveResources(MachineInstr &MI);

// Reserve the resources occupied by a machine instruction and change the
  // current state to reflect that change.
  void reserveResources(MachineInstr &MI);

// Return the resources used by the InstIdx'th instruction added to this
  // packet. The resources are returned as a bitvector of functional units.
  //
  // Note that a bundle may be packed in multiple valid ways. This function
  // returns one arbitary valid packing.
  //
  // Requires setTrackResources(true) to have been called.
  unsigned getUsedResources(unsigned InstIdx);

const InstrItineraryData *getInstrItins() const { return InstrItins; }
};

// VLIWPacketizerList implements a simple VLIW packetizer using DFA. The
// packetizer works on machine basic blocks. For each instruction I in BB,
// the packetizer consults the DFA to see if machine resources are available
// to execute I. If so, the packetizer checks if I depends on any instruction
// in the current packet. If no dependency is found, I is added to current
// packet and the machine resource is marked as taken. If any dependency is
// found, a target API call is made to prune the dependence.
class VLIWPacketizerList {
protected:
  MachineFunction &MF;
  const TargetInstrInfo *TII;
  AAResults *AA;

// The VLIW Scheduler.
  DefaultVLIWScheduler *VLIWScheduler;
  // Vector of instructions assigned to the current packet.
  std::vector<MachineInstr*> CurrentPacketMIs;
  // DFA resource tracker.
  DFAPacketizer *ResourceTracker;
  // Map: MI -> SU.
  std::map<MachineInstr*, SUnit*> MIToSUnit;

public:
  // The AAResults parameter can be nullptr.
  VLIWPacketizerList(MachineFunction &MF, MachineLoopInfo &MLI,
                     AAResults *AA);

virtual ~VLIWPacketizerList();

// Implement this API in the backend to bundle instructions.
  void PacketizeMIs(MachineBasicBlock *MBB,
                    MachineBasicBlock::iterator BeginItr,
                    MachineBasicBlock::iterator EndItr);

// Return the ResourceTracker.
  DFAPacketizer *getResourceTracker() {return ResourceTracker;}

// addToPacket - Add MI to the current packet.
  virtual MachineBasicBlock::iterator addToPacket(MachineInstr &MI) {
    CurrentPacketMIs.push_back(&MI);
    ResourceTracker->reserveResources(MI);
    return MI;
  }

// End the current packet and reset the state of the packetizer.
  // Overriding this function allows the target-specific packetizer
  // to perform custom finalization.
  virtual void endPacket(MachineBasicBlock *MBB,
                         MachineBasicBlock::iterator MI);

// Perform initialization before packetizing an instruction. This
  // function is supposed to be overrided by the target dependent packetizer.
  virtual void initPacketizerState() {}

// Check if the given instruction I should be ignored by the packetizer.
  virtual bool ignorePseudoInstruction(const MachineInstr &I,
                                       const MachineBasicBlock *MBB) {
    return false;
  }

// Return true if instruction MI can not be packetized with any other
  // instruction, which means that MI itself is a packet.
  virtual bool isSoloInstruction(const MachineInstr &MI) { return true; }

// Check if the packetizer should try to add the given instruction to
  // the current packet. One reasons for which it may not be desirable
  // to include an instruction in the current packet could be that it
  // would cause a stall.
  // If this function returns "false", the current packet will be ended,
  // and the instruction will be added to the next packet.
  virtual bool shouldAddToPacket(const MachineInstr &MI) { return true; }

// Check if it is legal to packetize SUI and SUJ together.
  virtual bool isLegalToPacketizeTogether(SUnit *SUI, SUnit *SUJ) {
    return false;
  }

// Check if it is legal to prune dependece between SUI and SUJ.
  virtual bool isLegalToPruneDependencies(SUnit *SUI, SUnit *SUJ) {
    return false;
  }

// Add a DAG mutation to be done before the packetization begins.
  void addMutation(std::unique_ptr<ScheduleDAGMutation> Mutation);

bool alias(const MachineInstr &MI1, const MachineInstr &MI2,
             bool UseTBAA = true) const;

private:
  bool alias(const MachineMemOperand &Op1, const MachineMemOperand &Op2,
             bool UseTBAA = true) const;
};

} // end namespace llvm

#endif // LLVM_CODEGEN_DFAPACKETIZER_H

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