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📄 AggressiveAntiDepBreaker.cpp(37.23 KB)
📄 AggressiveAntiDepBreaker.h(6.8 KB)
📄 AllocationOrder.cpp(1.96 KB)
📄 AllocationOrder.h(2.96 KB)
📄 Analysis.cpp(32.62 KB)
📁 AsmPrinter
📄 AtomicExpandPass.cpp(71.86 KB)
📄 BBSectionsPrepare.cpp(18.8 KB)
📄 BasicTargetTransformInfo.cpp(1.53 KB)
📄 BranchFolding.cpp(77.92 KB)
📄 BranchFolding.h(7.36 KB)
📄 BranchRelaxation.cpp(19.45 KB)
📄 BreakFalseDeps.cpp(9.79 KB)
📄 BuiltinGCs.cpp(4.88 KB)
📄 CFGuardLongjmp.cpp(3.73 KB)
📄 CFIInstrInserter.cpp(17.53 KB)
📄 CalcSpillWeights.cpp(10.22 KB)
📄 CallingConvLower.cpp(10.4 KB)
📄 CodeGen.cpp(5.28 KB)
📄 CodeGenPrepare.cpp(295.01 KB)
📄 CommandFlags.cpp(24.89 KB)
📄 CriticalAntiDepBreaker.cpp(27.91 KB)
📄 CriticalAntiDepBreaker.h(4.22 KB)
📄 DFAPacketizer.cpp(10.91 KB)
📄 DeadMachineInstructionElim.cpp(6.52 KB)
📄 DetectDeadLanes.cpp(20.74 KB)
📄 DwarfEHPrepare.cpp(9.01 KB)
📄 EarlyIfConversion.cpp(37.51 KB)
📄 EdgeBundles.cpp(3.21 KB)
📄 ExecutionDomainFix.cpp(14.67 KB)
📄 ExpandMemCmp.cpp(33.66 KB)
📄 ExpandPostRAPseudos.cpp(7.28 KB)
📄 ExpandReductions.cpp(7.23 KB)
📄 FEntryInserter.cpp(1.81 KB)
📄 FaultMaps.cpp(4.99 KB)
📄 FinalizeISel.cpp(2.65 KB)
📄 FixupStatepointCallerSaved.cpp(11.06 KB)
📄 FuncletLayout.cpp(2.21 KB)
📄 GCMetadata.cpp(5.1 KB)
📄 GCMetadataPrinter.cpp(748 B)
📄 GCRootLowering.cpp(11.46 KB)
📄 GCStrategy.cpp(708 B)
📁 GlobalISel
📄 GlobalMerge.cpp(24.52 KB)
📄 HardwareLoops.cpp(18.44 KB)
📄 IfConversion.cpp(89.43 KB)
📄 ImplicitNullChecks.cpp(25.14 KB)
📄 IndirectBrExpandPass.cpp(7.79 KB)
📄 InlineSpiller.cpp(58.24 KB)
📄 InterferenceCache.cpp(8.83 KB)
📄 InterferenceCache.h(7.22 KB)
📄 InterleavedAccessPass.cpp(16.59 KB)
📄 InterleavedLoadCombinePass.cpp(42.35 KB)
📄 IntrinsicLowering.cpp(17.08 KB)
📄 LLVMTargetMachine.cpp(10.25 KB)
📄 LatencyPriorityQueue.cpp(5.64 KB)
📄 LazyMachineBlockFrequencyInfo.cpp(3.36 KB)
📄 LexicalScopes.cpp(12.16 KB)
📄 LiveDebugValues.cpp(78.98 KB)
📄 LiveDebugVariables.cpp(51.79 KB)
📄 LiveDebugVariables.h(2.15 KB)
📄 LiveInterval.cpp(46.67 KB)
📄 LiveIntervalCalc.cpp(7.62 KB)
📄 LiveIntervalUnion.cpp(6.36 KB)
📄 LiveIntervals.cpp(64.59 KB)
📄 LivePhysRegs.cpp(11.08 KB)
📄 LiveRangeCalc.cpp(15.72 KB)
📄 LiveRangeEdit.cpp(17.03 KB)
📄 LiveRangeShrink.cpp(8.69 KB)
📄 LiveRangeUtils.h(2.12 KB)
📄 LiveRegMatrix.cpp(7.47 KB)
📄 LiveRegUnits.cpp(4.72 KB)
📄 LiveStacks.cpp(2.95 KB)
📄 LiveVariables.cpp(30.26 KB)
📄 LocalStackSlotAllocation.cpp(17.26 KB)
📄 LoopTraversal.cpp(2.89 KB)
📄 LowLevelType.cpp(1.93 KB)
📄 LowerEmuTLS.cpp(5.66 KB)
📄 MBFIWrapper.cpp(1.57 KB)
📄 MIRCanonicalizerPass.cpp(12.46 KB)
📄 MIRNamerPass.cpp(2.16 KB)
📁 MIRParser
📄 MIRPrinter.cpp(32.67 KB)
📄 MIRPrintingPass.cpp(1.99 KB)
📄 MIRVRegNamerUtils.cpp(6.04 KB)
📄 MIRVRegNamerUtils.h(3.25 KB)
📄 MachineBasicBlock.cpp(50.47 KB)
📄 MachineBlockFrequencyInfo.cpp(10.13 KB)
📄 MachineBlockPlacement.cpp(137.61 KB)
📄 MachineBranchProbabilityInfo.cpp(3.5 KB)
📄 MachineCSE.cpp(31.82 KB)
📄 MachineCombiner.cpp(28.13 KB)
📄 MachineCopyPropagation.cpp(29.21 KB)
📄 MachineDebugify.cpp(6.47 KB)
📄 MachineDominanceFrontier.cpp(1.83 KB)
📄 MachineDominators.cpp(4.86 KB)
📄 MachineFrameInfo.cpp(9.77 KB)
📄 MachineFunction.cpp(42.97 KB)
📄 MachineFunctionPass.cpp(4.78 KB)
📄 MachineFunctionPrinterPass.cpp(2.3 KB)
📄 MachineInstr.cpp(76.39 KB)
📄 MachineInstrBundle.cpp(11.49 KB)
📄 MachineLICM.cpp(57.05 KB)
📄 MachineLoopInfo.cpp(4.98 KB)
📄 MachineLoopUtils.cpp(5.16 KB)
📄 MachineModuleInfo.cpp(9.9 KB)
📄 MachineModuleInfoImpls.cpp(1.5 KB)
📄 MachineOperand.cpp(39.6 KB)
📄 MachineOptimizationRemarkEmitter.cpp(3.29 KB)
📄 MachineOutliner.cpp(42.13 KB)
📄 MachinePipeliner.cpp(111.33 KB)
📄 MachinePostDominators.cpp(2.42 KB)
📄 MachineRegionInfo.cpp(4.75 KB)
📄 MachineRegisterInfo.cpp(22.97 KB)
📄 MachineSSAUpdater.cpp(12.99 KB)
📄 MachineScheduler.cpp(136.89 KB)
📄 MachineSink.cpp(51.94 KB)
📄 MachineSizeOpts.cpp(8.76 KB)
📄 MachineStripDebug.cpp(3.76 KB)
📄 MachineTraceMetrics.cpp(49.58 KB)
📄 MachineVerifier.cpp(107.98 KB)
📄 MacroFusion.cpp(7.55 KB)
📄 ModuloSchedule.cpp(85.09 KB)
📄 NonRelocatableStringpool.cpp(1.65 KB)
📄 OptimizePHIs.cpp(6.7 KB)
📄 PHIElimination.cpp(27.73 KB)
📄 PHIEliminationUtils.cpp(2.56 KB)
📄 PHIEliminationUtils.h(972 B)
📄 ParallelCG.cpp(3.71 KB)
📄 PatchableFunction.cpp(3.44 KB)
📄 PeepholeOptimizer.cpp(78.41 KB)
📄 PostRAHazardRecognizer.cpp(3.5 KB)
📄 PostRASchedulerList.cpp(24.31 KB)
📄 PreISelIntrinsicLowering.cpp(7.91 KB)
📄 ProcessImplicitDefs.cpp(5.4 KB)
📄 PrologEpilogInserter.cpp(50.45 KB)
📄 PseudoSourceValue.cpp(4.71 KB)
📄 RDFGraph.cpp(58.39 KB)
📄 RDFLiveness.cpp(40.7 KB)
📄 RDFRegisters.cpp(11.29 KB)
📄 ReachingDefAnalysis.cpp(21.74 KB)
📄 RegAllocBase.cpp(6.31 KB)
📄 RegAllocBase.h(4.63 KB)
📄 RegAllocBasic.cpp(11.33 KB)
📄 RegAllocFast.cpp(45.78 KB)
📄 RegAllocGreedy.cpp(123.32 KB)
📄 RegAllocPBQP.cpp(33.14 KB)
📄 RegUsageInfoCollector.cpp(7.39 KB)
📄 RegUsageInfoPropagate.cpp(5.07 KB)
📄 RegisterClassInfo.cpp(6.62 KB)
📄 RegisterCoalescer.cpp(151.71 KB)
📄 RegisterCoalescer.h(4.04 KB)
📄 RegisterPressure.cpp(48.86 KB)
📄 RegisterScavenging.cpp(27.48 KB)
📄 RegisterUsageInfo.cpp(3.18 KB)
📄 RenameIndependentSubregs.cpp(14.79 KB)
📄 ResetMachineFunctionPass.cpp(3.48 KB)
📄 SafeStack.cpp(34.12 KB)
📄 SafeStackLayout.cpp(5.3 KB)
📄 SafeStackLayout.h(2.41 KB)
📄 ScalarizeMaskedMemIntrin.cpp(31.46 KB)
📄 ScheduleDAG.cpp(21.34 KB)
📄 ScheduleDAGInstrs.cpp(54.59 KB)
📄 ScheduleDAGPrinter.cpp(3.21 KB)
📄 ScoreboardHazardRecognizer.cpp(7.96 KB)
📁 SelectionDAG
📄 ShadowStackGCLowering.cpp(14.16 KB)
📄 ShrinkWrap.cpp(23.03 KB)
📄 SjLjEHPrepare.cpp(18.93 KB)
📄 SlotIndexes.cpp(9.35 KB)
📄 SpillPlacement.cpp(12.58 KB)
📄 SpillPlacement.h(6.67 KB)
📄 SplitKit.cpp(66.39 KB)
📄 SplitKit.h(23.7 KB)
📄 StackColoring.cpp(49.03 KB)
📄 StackMapLivenessAnalysis.cpp(6.16 KB)
📄 StackMaps.cpp(19.74 KB)
📄 StackProtector.cpp(22.94 KB)
📄 StackSlotColoring.cpp(17.12 KB)
📄 SwiftErrorValueTracking.cpp(11.37 KB)
📄 SwitchLoweringUtils.cpp(18.33 KB)
📄 TailDuplication.cpp(3.32 KB)
📄 TailDuplicator.cpp(38.29 KB)
📄 TargetFrameLoweringImpl.cpp(6.24 KB)
📄 TargetInstrInfo.cpp(51.1 KB)
📄 TargetLoweringBase.cpp(82.53 KB)
📄 TargetLoweringObjectFileImpl.cpp(80.52 KB)
📄 TargetOptionsImpl.cpp(2 KB)
📄 TargetPassConfig.cpp(48.89 KB)
📄 TargetRegisterInfo.cpp(19.15 KB)
📄 TargetSchedule.cpp(13.16 KB)
📄 TargetSubtargetInfo.cpp(1.89 KB)
📄 TwoAddressInstructionPass.cpp(62.08 KB)
📄 TypePromotion.cpp(32.46 KB)
📄 UnreachableBlockElim.cpp(7.48 KB)
📄 ValueTypes.cpp(19.87 KB)
📄 VirtRegMap.cpp(21.4 KB)
📄 WasmEHPrepare.cpp(17.48 KB)
📄 WinEHPrepare.cpp(51.16 KB)
📄 XRayInstrumentation.cpp(9.66 KB)

Editing: DFAPacketizer.cpp

//=- llvm/CodeGen/DFAPacketizer.cpp - 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.
//
//===----------------------------------------------------------------------===//

#include "llvm/CodeGen/DFAPacketizer.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/Analysis/AliasAnalysis.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/CodeGen/MachineInstrBundle.h"
#include "llvm/CodeGen/ScheduleDAG.h"
#include "llvm/CodeGen/ScheduleDAGInstrs.h"
#include "llvm/CodeGen/TargetInstrInfo.h"
#include "llvm/CodeGen/TargetSubtargetInfo.h"
#include "llvm/MC/MCInstrDesc.h"
#include "llvm/MC/MCInstrItineraries.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
#include <algorithm>
#include <cassert>
#include <iterator>
#include <memory>
#include <vector>

using namespace llvm;

#define DEBUG_TYPE "packets"

static cl::opt<unsigned> InstrLimit("dfa-instr-limit", cl::Hidden,
  cl::init(0), cl::desc("If present, stops packetizing after N instructions"));

static unsigned InstrCount = 0;

// Check if the resources occupied by a MCInstrDesc are available in the
// current state.
bool DFAPacketizer::canReserveResources(const MCInstrDesc *MID) {
  unsigned Action = ItinActions[MID->getSchedClass()];
  if (MID->getSchedClass() == 0 || Action == 0)
    return false;
  return A.canAdd(Action);
}

// Reserve the resources occupied by a MCInstrDesc and change the current
// state to reflect that change.
void DFAPacketizer::reserveResources(const MCInstrDesc *MID) {
  unsigned Action = ItinActions[MID->getSchedClass()];
  if (MID->getSchedClass() == 0 || Action == 0)
    return;
  A.add(Action);
}

// Check if the resources occupied by a machine instruction are available
// in the current state.
bool DFAPacketizer::canReserveResources(MachineInstr &MI) {
  const MCInstrDesc &MID = MI.getDesc();
  return canReserveResources(&MID);
}

// Reserve the resources occupied by a machine instruction and change the
// current state to reflect that change.
void DFAPacketizer::reserveResources(MachineInstr &MI) {
  const MCInstrDesc &MID = MI.getDesc();
  reserveResources(&MID);
}

unsigned DFAPacketizer::getUsedResources(unsigned InstIdx) {
  ArrayRef<NfaPath> NfaPaths = A.getNfaPaths();
  assert(!NfaPaths.empty() && "Invalid bundle!");
  const NfaPath &RS = NfaPaths.front();

// RS stores the cumulative resources used up to and including the I'th
  // instruction. The 0th instruction is the base case.
  if (InstIdx == 0)
    return RS[0];
  // Return the difference between the cumulative resources used by InstIdx and
  // its predecessor.
  return RS[InstIdx] ^ RS[InstIdx - 1];
}

namespace llvm {

// This class extends ScheduleDAGInstrs and overrides the schedule method
// to build the dependence graph.
class DefaultVLIWScheduler : public ScheduleDAGInstrs {
private:
  AAResults *AA;
  /// Ordered list of DAG postprocessing steps.
  std::vector<std::unique_ptr<ScheduleDAGMutation>> Mutations;

public:
  DefaultVLIWScheduler(MachineFunction &MF, MachineLoopInfo &MLI,
                       AAResults *AA);

// Actual scheduling work.
  void schedule() override;

/// DefaultVLIWScheduler takes ownership of the Mutation object.
  void addMutation(std::unique_ptr<ScheduleDAGMutation> Mutation) {
    Mutations.push_back(std::move(Mutation));
  }

protected:
  void postprocessDAG();
};

} // end namespace llvm

DefaultVLIWScheduler::DefaultVLIWScheduler(MachineFunction &MF,
                                           MachineLoopInfo &MLI,
                                           AAResults *AA)
    : ScheduleDAGInstrs(MF, &MLI), AA(AA) {
  CanHandleTerminators = true;
}

/// Apply each ScheduleDAGMutation step in order.
void DefaultVLIWScheduler::postprocessDAG() {
  for (auto &M : Mutations)
    M->apply(this);
}

void DefaultVLIWScheduler::schedule() {
  // Build the scheduling graph.
  buildSchedGraph(AA);
  postprocessDAG();
}

VLIWPacketizerList::VLIWPacketizerList(MachineFunction &mf,
                                       MachineLoopInfo &mli, AAResults *aa)
    : MF(mf), TII(mf.getSubtarget().getInstrInfo()), AA(aa) {
  ResourceTracker = TII->CreateTargetScheduleState(MF.getSubtarget());
  ResourceTracker->setTrackResources(true);
  VLIWScheduler = new DefaultVLIWScheduler(MF, mli, AA);
}

VLIWPacketizerList::~VLIWPacketizerList() {
  delete VLIWScheduler;
  delete ResourceTracker;
}

// End the current packet, bundle packet instructions and reset DFA state.
void VLIWPacketizerList::endPacket(MachineBasicBlock *MBB,
                                   MachineBasicBlock::iterator MI) {
  LLVM_DEBUG({
    if (!CurrentPacketMIs.empty()) {
      dbgs() << "Finalizing packet:\n";
      unsigned Idx = 0;
      for (MachineInstr *MI : CurrentPacketMIs) {
        unsigned R = ResourceTracker->getUsedResources(Idx++);
        dbgs() << " * [res:0x" << utohexstr(R) << "] " << *MI;
      }
    }
  });
  if (CurrentPacketMIs.size() > 1) {
    MachineInstr &MIFirst = *CurrentPacketMIs.front();
    finalizeBundle(*MBB, MIFirst.getIterator(), MI.getInstrIterator());
  }
  CurrentPacketMIs.clear();
  ResourceTracker->clearResources();
  LLVM_DEBUG(dbgs() << "End packet\n");
}

// Bundle machine instructions into packets.
void VLIWPacketizerList::PacketizeMIs(MachineBasicBlock *MBB,
                                      MachineBasicBlock::iterator BeginItr,
                                      MachineBasicBlock::iterator EndItr) {
  assert(VLIWScheduler && "VLIW Scheduler is not initialized!");
  VLIWScheduler->startBlock(MBB);
  VLIWScheduler->enterRegion(MBB, BeginItr, EndItr,
                             std::distance(BeginItr, EndItr));
  VLIWScheduler->schedule();

LLVM_DEBUG({
    dbgs() << "Scheduling DAG of the packetize region\n";
    VLIWScheduler->dump();
  });

// Generate MI -> SU map.
  MIToSUnit.clear();
  for (SUnit &SU : VLIWScheduler->SUnits)
    MIToSUnit[SU.getInstr()] = &SU;

bool LimitPresent = InstrLimit.getPosition();

// The main packetizer loop.
  for (; BeginItr != EndItr; ++BeginItr) {
    if (LimitPresent) {
      if (InstrCount >= InstrLimit) {
        EndItr = BeginItr;
        break;
      }
      InstrCount++;
    }
    MachineInstr &MI = *BeginItr;
    initPacketizerState();

// End the current packet if needed.
    if (isSoloInstruction(MI)) {
      endPacket(MBB, MI);
      continue;
    }

// Ignore pseudo instructions.
    if (ignorePseudoInstruction(MI, MBB))
      continue;

SUnit *SUI = MIToSUnit[&MI];
    assert(SUI && "Missing SUnit Info!");

// Ask DFA if machine resource is available for MI.
    LLVM_DEBUG(dbgs() << "Checking resources for adding MI to packet " << MI);

bool ResourceAvail = ResourceTracker->canReserveResources(MI);
    LLVM_DEBUG({
      if (ResourceAvail)
        dbgs() << "  Resources are available for adding MI to packet\n";
      else
        dbgs() << "  Resources NOT available\n";
    });
    if (ResourceAvail && shouldAddToPacket(MI)) {
      // Dependency check for MI with instructions in CurrentPacketMIs.
      for (auto MJ : CurrentPacketMIs) {
        SUnit *SUJ = MIToSUnit[MJ];
        assert(SUJ && "Missing SUnit Info!");

LLVM_DEBUG(dbgs() << "  Checking against MJ " << *MJ);
        // Is it legal to packetize SUI and SUJ together.
        if (!isLegalToPacketizeTogether(SUI, SUJ)) {
          LLVM_DEBUG(dbgs() << "  Not legal to add MI, try to prune\n");
          // Allow packetization if dependency can be pruned.
          if (!isLegalToPruneDependencies(SUI, SUJ)) {
            // End the packet if dependency cannot be pruned.
            LLVM_DEBUG(dbgs()
                       << "  Could not prune dependencies for adding MI\n");
            endPacket(MBB, MI);
            break;
          }
          LLVM_DEBUG(dbgs() << "  Pruned dependence for adding MI\n");
        }
      }
    } else {
      LLVM_DEBUG(if (ResourceAvail) dbgs()
                 << "Resources are available, but instruction should not be "
                    "added to packet\n  "
                 << MI);
      // End the packet if resource is not available, or if the instruction
      // shoud not be added to the current packet.
      endPacket(MBB, MI);
    }

// Add MI to the current packet.
    LLVM_DEBUG(dbgs() << "* Adding MI to packet " << MI << '\n');
    BeginItr = addToPacket(MI);
  } // For all instructions in the packetization range.

// End any packet left behind.
  endPacket(MBB, EndItr);
  VLIWScheduler->exitRegion();
  VLIWScheduler->finishBlock();
}

bool VLIWPacketizerList::alias(const MachineMemOperand &Op1,
                               const MachineMemOperand &Op2,
                               bool UseTBAA) const {
  if (!Op1.getValue() || !Op2.getValue())
    return true;

int64_t MinOffset = std::min(Op1.getOffset(), Op2.getOffset());
  int64_t Overlapa = Op1.getSize() + Op1.getOffset() - MinOffset;
  int64_t Overlapb = Op2.getSize() + Op2.getOffset() - MinOffset;

AliasResult AAResult =
      AA->alias(MemoryLocation(Op1.getValue(), Overlapa,
                               UseTBAA ? Op1.getAAInfo() : AAMDNodes()),
                MemoryLocation(Op2.getValue(), Overlapb,
                               UseTBAA ? Op2.getAAInfo() : AAMDNodes()));

return AAResult != NoAlias;
}

bool VLIWPacketizerList::alias(const MachineInstr &MI1,
                               const MachineInstr &MI2,
                               bool UseTBAA) const {
  if (MI1.memoperands_empty() || MI2.memoperands_empty())
    return true;

for (const MachineMemOperand *Op1 : MI1.memoperands())
    for (const MachineMemOperand *Op2 : MI2.memoperands())
      if (alias(*Op1, *Op2, UseTBAA))
        return true;
  return false;
}

// Add a DAG mutation object to the ordered list.
void VLIWPacketizerList::addMutation(
      std::unique_ptr<ScheduleDAGMutation> Mutation) {
  VLIWScheduler->addMutation(std::move(Mutation));
}

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Editing: DFAPacketizer.cpp

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