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📄 AtomicExpandUtils.h(2.49 KB)
📄 BasicTTIImpl.h(73.64 KB)
📄 BuiltinGCs.h(1008 B)
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📄 CalcSpillWeights.h(4.69 KB)
📄 CallingConvLower.h(21 KB)
📄 CommandFlags.h(3.65 KB)
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📄 ExpandReductions.h(726 B)
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📄 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)
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📄 LiveVariables.h(12.98 KB)
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📄 LowLevelType.h(1.28 KB)
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📄 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)
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📄 MachineJumpTableInfo.h(4.66 KB)
📄 MachineLoopInfo.h(7.3 KB)
📄 MachineLoopUtils.h(1.74 KB)
📄 MachineMemOperand.h(12.69 KB)
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📄 MachineOutliner.h(8.04 KB)
📄 MachinePassRegistry.h(6.1 KB)
📄 MachinePipeliner.h(21.17 KB)
📄 MachinePostDominators.h(2.93 KB)
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📄 MachineRegisterInfo.h(46.75 KB)
📄 MachineSSAUpdater.h(4.37 KB)
📄 MachineScheduler.h(36.6 KB)
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📄 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)
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📄 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: SwitchLoweringUtils.h

//===- SwitchLoweringUtils.h - Switch Lowering ------------------*- 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
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_CODEGEN_SWITCHLOWERINGUTILS_H
#define LLVM_CODEGEN_SWITCHLOWERINGUTILS_H

#include "llvm/ADT/SmallVector.h"
#include "llvm/CodeGen/SelectionDAGNodes.h"
#include "llvm/CodeGen/TargetLowering.h"
#include "llvm/IR/Constants.h"
#include "llvm/Support/BranchProbability.h"

namespace llvm {

class FunctionLoweringInfo;
class MachineBasicBlock;
class BlockFrequencyInfo;

namespace SwitchCG {

enum CaseClusterKind {
  /// A cluster of adjacent case labels with the same destination, or just one
  /// case.
  CC_Range,
  /// A cluster of cases suitable for jump table lowering.
  CC_JumpTable,
  /// A cluster of cases suitable for bit test lowering.
  CC_BitTests
};

/// A cluster of case labels.
struct CaseCluster {
  CaseClusterKind Kind;
  const ConstantInt *Low, *High;
  union {
    MachineBasicBlock *MBB;
    unsigned JTCasesIndex;
    unsigned BTCasesIndex;
  };
  BranchProbability Prob;

static CaseCluster range(const ConstantInt *Low, const ConstantInt *High,
                           MachineBasicBlock *MBB, BranchProbability Prob) {
    CaseCluster C;
    C.Kind = CC_Range;
    C.Low = Low;
    C.High = High;
    C.MBB = MBB;
    C.Prob = Prob;
    return C;
  }

static CaseCluster jumpTable(const ConstantInt *Low, const ConstantInt *High,
                               unsigned JTCasesIndex, BranchProbability Prob) {
    CaseCluster C;
    C.Kind = CC_JumpTable;
    C.Low = Low;
    C.High = High;
    C.JTCasesIndex = JTCasesIndex;
    C.Prob = Prob;
    return C;
  }

static CaseCluster bitTests(const ConstantInt *Low, const ConstantInt *High,
                              unsigned BTCasesIndex, BranchProbability Prob) {
    CaseCluster C;
    C.Kind = CC_BitTests;
    C.Low = Low;
    C.High = High;
    C.BTCasesIndex = BTCasesIndex;
    C.Prob = Prob;
    return C;
  }
};

using CaseClusterVector = std::vector<CaseCluster>;
using CaseClusterIt = CaseClusterVector::iterator;

/// Sort Clusters and merge adjacent cases.
void sortAndRangeify(CaseClusterVector &Clusters);

struct CaseBits {
  uint64_t Mask = 0;
  MachineBasicBlock *BB = nullptr;
  unsigned Bits = 0;
  BranchProbability ExtraProb;

CaseBits() = default;
  CaseBits(uint64_t mask, MachineBasicBlock *bb, unsigned bits,
           BranchProbability Prob)
      : Mask(mask), BB(bb), Bits(bits), ExtraProb(Prob) {}
};

using CaseBitsVector = std::vector<CaseBits>;

/// This structure is used to communicate between SelectionDAGBuilder and
/// SDISel for the code generation of additional basic blocks needed by
/// multi-case switch statements.
struct CaseBlock {
  // For the GISel interface.
  struct PredInfoPair {
    CmpInst::Predicate Pred;
    // Set when no comparison should be emitted.
    bool NoCmp;
  };
  union {
    // The condition code to use for the case block's setcc node.
    // Besides the integer condition codes, this can also be SETTRUE, in which
    // case no comparison gets emitted.
    ISD::CondCode CC;
    struct PredInfoPair PredInfo;
  };

// The LHS/MHS/RHS of the comparison to emit.
  // Emit by default LHS op RHS. MHS is used for range comparisons:
  // If MHS is not null: (LHS <= MHS) and (MHS <= RHS).
  const Value *CmpLHS, *CmpMHS, *CmpRHS;

// The block to branch to if the setcc is true/false.
  MachineBasicBlock *TrueBB, *FalseBB;

// The block into which to emit the code for the setcc and branches.
  MachineBasicBlock *ThisBB;

/// The debug location of the instruction this CaseBlock was
  /// produced from.
  SDLoc DL;
  DebugLoc DbgLoc;

// Branch weights.
  BranchProbability TrueProb, FalseProb;

// Constructor for SelectionDAG.
  CaseBlock(ISD::CondCode cc, const Value *cmplhs, const Value *cmprhs,
            const Value *cmpmiddle, MachineBasicBlock *truebb,
            MachineBasicBlock *falsebb, MachineBasicBlock *me, SDLoc dl,
            BranchProbability trueprob = BranchProbability::getUnknown(),
            BranchProbability falseprob = BranchProbability::getUnknown())
      : CC(cc), CmpLHS(cmplhs), CmpMHS(cmpmiddle), CmpRHS(cmprhs),
        TrueBB(truebb), FalseBB(falsebb), ThisBB(me), DL(dl),
        TrueProb(trueprob), FalseProb(falseprob) {}

// Constructor for GISel.
  CaseBlock(CmpInst::Predicate pred, bool nocmp, const Value *cmplhs,
            const Value *cmprhs, const Value *cmpmiddle,
            MachineBasicBlock *truebb, MachineBasicBlock *falsebb,
            MachineBasicBlock *me, DebugLoc dl,
            BranchProbability trueprob = BranchProbability::getUnknown(),
            BranchProbability falseprob = BranchProbability::getUnknown())
      : PredInfo({pred, nocmp}), CmpLHS(cmplhs), CmpMHS(cmpmiddle),
        CmpRHS(cmprhs), TrueBB(truebb), FalseBB(falsebb), ThisBB(me),
        DbgLoc(dl), TrueProb(trueprob), FalseProb(falseprob) {}
};

struct JumpTable {
  /// The virtual register containing the index of the jump table entry
  /// to jump to.
  unsigned Reg;
  /// The JumpTableIndex for this jump table in the function.
  unsigned JTI;
  /// The MBB into which to emit the code for the indirect jump.
  MachineBasicBlock *MBB;
  /// The MBB of the default bb, which is a successor of the range
  /// check MBB.  This is when updating PHI nodes in successors.
  MachineBasicBlock *Default;

JumpTable(unsigned R, unsigned J, MachineBasicBlock *M, MachineBasicBlock *D)
      : Reg(R), JTI(J), MBB(M), Default(D) {}
};
struct JumpTableHeader {
  APInt First;
  APInt Last;
  const Value *SValue;
  MachineBasicBlock *HeaderBB;
  bool Emitted;
  bool OmitRangeCheck;

JumpTableHeader(APInt F, APInt L, const Value *SV, MachineBasicBlock *H,
                  bool E = false)
      : First(std::move(F)), Last(std::move(L)), SValue(SV), HeaderBB(H),
        Emitted(E), OmitRangeCheck(false) {}
};
using JumpTableBlock = std::pair<JumpTableHeader, JumpTable>;

struct BitTestCase {
  uint64_t Mask;
  MachineBasicBlock *ThisBB;
  MachineBasicBlock *TargetBB;
  BranchProbability ExtraProb;

BitTestCase(uint64_t M, MachineBasicBlock *T, MachineBasicBlock *Tr,
              BranchProbability Prob)
      : Mask(M), ThisBB(T), TargetBB(Tr), ExtraProb(Prob) {}
};

using BitTestInfo = SmallVector<BitTestCase, 3>;

struct BitTestBlock {
  APInt First;
  APInt Range;
  const Value *SValue;
  unsigned Reg;
  MVT RegVT;
  bool Emitted;
  bool ContiguousRange;
  MachineBasicBlock *Parent;
  MachineBasicBlock *Default;
  BitTestInfo Cases;
  BranchProbability Prob;
  BranchProbability DefaultProb;
  bool OmitRangeCheck;

BitTestBlock(APInt F, APInt R, const Value *SV, unsigned Rg, MVT RgVT, bool E,
               bool CR, MachineBasicBlock *P, MachineBasicBlock *D,
               BitTestInfo C, BranchProbability Pr)
      : First(std::move(F)), Range(std::move(R)), SValue(SV), Reg(Rg),
        RegVT(RgVT), Emitted(E), ContiguousRange(CR), Parent(P), Default(D),
        Cases(std::move(C)), Prob(Pr), OmitRangeCheck(false) {}
};

/// Return the range of values within a range.
uint64_t getJumpTableRange(const CaseClusterVector &Clusters, unsigned First,
                           unsigned Last);

/// Return the number of cases within a range.
uint64_t getJumpTableNumCases(const SmallVectorImpl<unsigned> &TotalCases,
                              unsigned First, unsigned Last);

struct SwitchWorkListItem {
  MachineBasicBlock *MBB;
  CaseClusterIt FirstCluster;
  CaseClusterIt LastCluster;
  const ConstantInt *GE;
  const ConstantInt *LT;
  BranchProbability DefaultProb;
};
using SwitchWorkList = SmallVector<SwitchWorkListItem, 4>;

class SwitchLowering {
public:
  SwitchLowering(FunctionLoweringInfo &funcinfo) : FuncInfo(funcinfo) {}

void init(const TargetLowering &tli, const TargetMachine &tm,
            const DataLayout &dl) {
    TLI = &tli;
    TM = &tm;
    DL = &dl;
  }

/// Vector of CaseBlock structures used to communicate SwitchInst code
  /// generation information.
  std::vector<CaseBlock> SwitchCases;

/// Vector of JumpTable structures used to communicate SwitchInst code
  /// generation information.
  std::vector<JumpTableBlock> JTCases;

/// Vector of BitTestBlock structures used to communicate SwitchInst code
  /// generation information.
  std::vector<BitTestBlock> BitTestCases;

void findJumpTables(CaseClusterVector &Clusters, const SwitchInst *SI,
                      MachineBasicBlock *DefaultMBB,
                      ProfileSummaryInfo *PSI, BlockFrequencyInfo *BFI);

bool buildJumpTable(const CaseClusterVector &Clusters, unsigned First,
                      unsigned Last, const SwitchInst *SI,
                      MachineBasicBlock *DefaultMBB, CaseCluster &JTCluster);

void findBitTestClusters(CaseClusterVector &Clusters, const SwitchInst *SI);

/// Build a bit test cluster from Clusters[First..Last]. Returns false if it
  /// decides it's not a good idea.
  bool buildBitTests(CaseClusterVector &Clusters, unsigned First, unsigned Last,
                     const SwitchInst *SI, CaseCluster &BTCluster);

virtual void addSuccessorWithProb(
      MachineBasicBlock *Src, MachineBasicBlock *Dst,
      BranchProbability Prob = BranchProbability::getUnknown()) = 0;

virtual ~SwitchLowering() = default;

private:
  const TargetLowering *TLI;
  const TargetMachine *TM;
  const DataLayout *DL;
  FunctionLoweringInfo &FuncInfo;
};

} // namespace SwitchCG
} // namespace llvm

#endif // LLVM_CODEGEN_SWITCHLOWERINGUTILS_H

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Editing: SwitchLoweringUtils.h

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