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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: ScoreboardHazardRecognizer.cpp

//===- ScoreboardHazardRecognizer.cpp - Scheduler Support -----------------===//
//
// 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 file implements the ScoreboardHazardRecognizer class, which
// encapsultes hazard-avoidance heuristics for scheduling, based on the
// scheduling itineraries specified for the target.
//
//===----------------------------------------------------------------------===//

#include "llvm/CodeGen/ScoreboardHazardRecognizer.h"
#include "llvm/CodeGen/ScheduleDAG.h"
#include "llvm/CodeGen/TargetInstrInfo.h"
#include "llvm/Config/llvm-config.h"
#include "llvm/MC/MCInstrDesc.h"
#include "llvm/MC/MCInstrItineraries.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
#include <cassert>

using namespace llvm;

#define DEBUG_TYPE DebugType

ScoreboardHazardRecognizer::ScoreboardHazardRecognizer(
    const InstrItineraryData *II, const ScheduleDAG *SchedDAG,
    const char *ParentDebugType)
    : ScheduleHazardRecognizer(), DebugType(ParentDebugType), ItinData(II),
      DAG(SchedDAG) {
  (void)DebugType;
  // Determine the maximum depth of any itinerary. This determines the depth of
  // the scoreboard. We always make the scoreboard at least 1 cycle deep to
  // avoid dealing with the boundary condition.
  unsigned ScoreboardDepth = 1;
  if (ItinData && !ItinData->isEmpty()) {
    for (unsigned idx = 0; ; ++idx) {
      if (ItinData->isEndMarker(idx))
        break;

const InstrStage *IS = ItinData->beginStage(idx);
      const InstrStage *E = ItinData->endStage(idx);
      unsigned CurCycle = 0;
      unsigned ItinDepth = 0;
      for (; IS != E; ++IS) {
        unsigned StageDepth = CurCycle + IS->getCycles();
        if (ItinDepth < StageDepth) ItinDepth = StageDepth;
        CurCycle += IS->getNextCycles();
      }

// Find the next power-of-2 >= ItinDepth
      while (ItinDepth > ScoreboardDepth) {
        ScoreboardDepth *= 2;
        // Don't set MaxLookAhead until we find at least one nonzero stage.
        // This way, an itinerary with no stages has MaxLookAhead==0, which
        // completely bypasses the scoreboard hazard logic.
        MaxLookAhead = ScoreboardDepth;
      }
    }
  }

ReservedScoreboard.reset(ScoreboardDepth);
  RequiredScoreboard.reset(ScoreboardDepth);

// If MaxLookAhead is not set above, then we are not enabled.
  if (!isEnabled())
    LLVM_DEBUG(dbgs() << "Disabled scoreboard hazard recognizer\n");
  else {
    // A nonempty itinerary must have a SchedModel.
    IssueWidth = ItinData->SchedModel.IssueWidth;
    LLVM_DEBUG(dbgs() << "Using scoreboard hazard recognizer: Depth = "
                      << ScoreboardDepth << '\n');
  }
}

void ScoreboardHazardRecognizer::Reset() {
  IssueCount = 0;
  RequiredScoreboard.reset();
  ReservedScoreboard.reset();
}

#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
LLVM_DUMP_METHOD void ScoreboardHazardRecognizer::Scoreboard::dump() const {
  dbgs() << "Scoreboard:\n";

unsigned last = Depth - 1;
  while ((last > 0) && ((*this)[last] == 0))
    last--;

for (unsigned i = 0; i <= last; i++) {
    InstrStage::FuncUnits FUs = (*this)[i];
    dbgs() << "\t";
    for (int j = std::numeric_limits<InstrStage::FuncUnits>::digits - 1;
         j >= 0; j--)
      dbgs() << ((FUs & (1ULL << j)) ? '1' : '0');
    dbgs() << '\n';
  }
}
#endif

bool ScoreboardHazardRecognizer::atIssueLimit() const {
  if (IssueWidth == 0)
    return false;

return IssueCount == IssueWidth;
}

ScheduleHazardRecognizer::HazardType
ScoreboardHazardRecognizer::getHazardType(SUnit *SU, int Stalls) {
  if (!ItinData || ItinData->isEmpty())
    return NoHazard;

// Note that stalls will be negative for bottom-up scheduling.
  int cycle = Stalls;

// Use the itinerary for the underlying instruction to check for
  // free FU's in the scoreboard at the appropriate future cycles.

const MCInstrDesc *MCID = DAG->getInstrDesc(SU);
  if (!MCID) {
    // Don't check hazards for non-machineinstr Nodes.
    return NoHazard;
  }
  unsigned idx = MCID->getSchedClass();
  for (const InstrStage *IS = ItinData->beginStage(idx),
         *E = ItinData->endStage(idx); IS != E; ++IS) {
    // We must find one of the stage's units free for every cycle the
    // stage is occupied. FIXME it would be more accurate to find the
    // same unit free in all the cycles.
    for (unsigned int i = 0; i < IS->getCycles(); ++i) {
      int StageCycle = cycle + (int)i;
      if (StageCycle < 0)
        continue;

if (StageCycle >= (int)RequiredScoreboard.getDepth()) {
        assert((StageCycle - Stalls) < (int)RequiredScoreboard.getDepth() &&
               "Scoreboard depth exceeded!");
        // This stage was stalled beyond pipeline depth, so cannot conflict.
        break;
      }

InstrStage::FuncUnits freeUnits = IS->getUnits();
      switch (IS->getReservationKind()) {
      case InstrStage::Required:
        // Required FUs conflict with both reserved and required ones
        freeUnits &= ~ReservedScoreboard[StageCycle];
        LLVM_FALLTHROUGH;
      case InstrStage::Reserved:
        // Reserved FUs can conflict only with required ones.
        freeUnits &= ~RequiredScoreboard[StageCycle];
        break;
      }

if (!freeUnits) {
        LLVM_DEBUG(dbgs() << "*** Hazard in cycle +" << StageCycle << ", ");
        LLVM_DEBUG(DAG->dumpNode(*SU));
        return Hazard;
      }
    }

// Advance the cycle to the next stage.
    cycle += IS->getNextCycles();
  }

return NoHazard;
}

void ScoreboardHazardRecognizer::EmitInstruction(SUnit *SU) {
  if (!ItinData || ItinData->isEmpty())
    return;

// Use the itinerary for the underlying instruction to reserve FU's
  // in the scoreboard at the appropriate future cycles.
  const MCInstrDesc *MCID = DAG->getInstrDesc(SU);
  assert(MCID && "The scheduler must filter non-machineinstrs");
  if (DAG->TII->isZeroCost(MCID->Opcode))
    return;

++IssueCount;

unsigned cycle = 0;

unsigned idx = MCID->getSchedClass();
  for (const InstrStage *IS = ItinData->beginStage(idx),
         *E = ItinData->endStage(idx); IS != E; ++IS) {
    // We must reserve one of the stage's units for every cycle the
    // stage is occupied. FIXME it would be more accurate to reserve
    // the same unit free in all the cycles.
    for (unsigned int i = 0; i < IS->getCycles(); ++i) {
      assert(((cycle + i) < RequiredScoreboard.getDepth()) &&
             "Scoreboard depth exceeded!");

InstrStage::FuncUnits freeUnits = IS->getUnits();
      switch (IS->getReservationKind()) {
      case InstrStage::Required:
        // Required FUs conflict with both reserved and required ones
        freeUnits &= ~ReservedScoreboard[cycle + i];
        LLVM_FALLTHROUGH;
      case InstrStage::Reserved:
        // Reserved FUs can conflict only with required ones.
        freeUnits &= ~RequiredScoreboard[cycle + i];
        break;
      }

// reduce to a single unit
      InstrStage::FuncUnits freeUnit = 0;
      do {
        freeUnit = freeUnits;
        freeUnits = freeUnit & (freeUnit - 1);
      } while (freeUnits);

if (IS->getReservationKind() == InstrStage::Required)
        RequiredScoreboard[cycle + i] |= freeUnit;
      else
        ReservedScoreboard[cycle + i] |= freeUnit;
    }

// Advance the cycle to the next stage.
    cycle += IS->getNextCycles();
  }

LLVM_DEBUG(ReservedScoreboard.dump());
  LLVM_DEBUG(RequiredScoreboard.dump());
}

void ScoreboardHazardRecognizer::AdvanceCycle() {
  IssueCount = 0;
  ReservedScoreboard[0] = 0; ReservedScoreboard.advance();
  RequiredScoreboard[0] = 0; RequiredScoreboard.advance();
}

void ScoreboardHazardRecognizer::RecedeCycle() {
  IssueCount = 0;
  ReservedScoreboard[ReservedScoreboard.getDepth()-1] = 0;
  ReservedScoreboard.recede();
  RequiredScoreboard[RequiredScoreboard.getDepth()-1] = 0;
  RequiredScoreboard.recede();
}

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Editing: ScoreboardHazardRecognizer.cpp

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