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📄 AliasAnalysis.h(51.98 KB)
📄 AliasAnalysisEvaluator.h(2.7 KB)
📄 AliasSetTracker.h(15.42 KB)
📄 AssumeBundleQueries.h(6.66 KB)
📄 AssumptionCache.h(8.39 KB)
📄 BasicAliasAnalysis.h(10.2 KB)
📄 BlockFrequencyInfo.h(5.59 KB)
📄 BlockFrequencyInfoImpl.h(56.46 KB)
📄 BranchProbabilityInfo.h(10.1 KB)
📄 CFG.h(7.76 KB)
📄 CFGPrinter.h(9.31 KB)
📄 CFLAliasAnalysisUtils.h(1.66 KB)
📄 CFLAndersAliasAnalysis.h(3.97 KB)
📄 CFLSteensAliasAnalysis.h(4.58 KB)
📄 CGSCCPassManager.h(41.2 KB)
📄 CallGraph.h(18.88 KB)
📄 CallGraphSCCPass.h(5.01 KB)
📄 CallPrinter.h(799 B)
📄 CaptureTracking.h(4.78 KB)
📄 CmpInstAnalysis.h(2.57 KB)
📄 CodeMetrics.h(3.15 KB)
📄 ConstantFolding.h(8.01 KB)
📄 DDG.h(19.15 KB)
📄 DOTGraphTraitsPass.h(5.5 KB)
📄 DemandedBits.h(4.07 KB)
📄 DependenceAnalysis.h(41.83 KB)
📄 DependenceGraphBuilder.h(7.74 KB)
📄 DivergenceAnalysis.h(7.38 KB)
📄 DomPrinter.h(1.04 KB)
📄 DomTreeUpdater.h(13.2 KB)
📄 DominanceFrontier.h(6.63 KB)
📄 DominanceFrontierImpl.h(7.12 KB)
📄 EHPersonalities.h(3.22 KB)
📄 GlobalsModRef.h(5.96 KB)
📄 GuardUtils.h(2.11 KB)
📄 HeatUtils.h(1.16 KB)
📄 IVDescriptors.h(14.56 KB)
📄 IVUsers.h(6.07 KB)
📄 IndirectCallPromotionAnalysis.h(2.61 KB)
📄 IndirectCallVisitor.h(1.16 KB)
📄 InlineAdvisor.h(8.71 KB)
📄 InlineCost.h(11.33 KB)
📄 InlineFeaturesAnalysis.h(1.5 KB)
📄 InlineModelFeatureMaps.h(3.41 KB)
📄 InlineSizeEstimatorAnalysis.h(1.07 KB)
📄 InstructionPrecedenceTracking.h(5.9 KB)
📄 InstructionSimplify.h(13.36 KB)
📄 Interval.h(4.84 KB)
📄 IntervalIterator.h(10.64 KB)
📄 IntervalPartition.h(4.05 KB)
📄 IteratedDominanceFrontier.h(2.62 KB)
📄 LazyBlockFrequencyInfo.h(4.34 KB)
📄 LazyBranchProbabilityInfo.h(4.21 KB)
📄 LazyCallGraph.h(50.13 KB)
📄 LazyValueInfo.h(5.4 KB)
📄 LegacyDivergenceAnalysis.h(2.53 KB)
📄 Lint.h(1.35 KB)
📄 Loads.h(7.86 KB)
📄 LoopAccessAnalysis.h(29.75 KB)
📄 LoopAnalysisManager.h(5.83 KB)
📄 LoopCacheAnalysis.h(11.91 KB)
📄 LoopInfo.h(48.27 KB)
📄 LoopInfoImpl.h(27.14 KB)
📄 LoopIterator.h(8.83 KB)
📄 LoopNestAnalysis.h(5.61 KB)
📄 LoopPass.h(4.29 KB)
📄 LoopUnrollAnalyzer.h(3.42 KB)
📄 MLInlineAdvisor.h(3.48 KB)
📄 MLModelRunner.h(1.16 KB)
📄 MemoryBuiltins.h(13.42 KB)
📄 MemoryDependenceAnalysis.h(20.82 KB)
📄 MemoryLocation.h(10.99 KB)
📄 MemorySSA.h(45.92 KB)
📄 MemorySSAUpdater.h(14.55 KB)
📄 ModuleSummaryAnalysis.h(3.44 KB)
📄 MustExecute.h(20.2 KB)
📄 ObjCARCAliasAnalysis.h(3.35 KB)
📄 ObjCARCAnalysisUtils.h(10.22 KB)
📄 ObjCARCInstKind.h(4.87 KB)
📄 OptimizationRemarkEmitter.h(5.93 KB)
📄 PHITransAddr.h(4.77 KB)
📄 Passes.h(3.88 KB)
📄 PhiValues.h(5.25 KB)
📄 PostDominators.h(3.41 KB)
📄 ProfileSummaryInfo.h(9.3 KB)
📄 PtrUseVisitor.h(9.96 KB)
📄 RegionInfo.h(35.23 KB)
📄 RegionInfoImpl.h(25.16 KB)
📄 RegionIterator.h(14.07 KB)
📄 RegionPass.h(4.05 KB)
📄 RegionPrinter.h(2.25 KB)
📄 ScalarEvolution.h(89.21 KB)
📄 ScalarEvolutionAliasAnalysis.h(2.09 KB)
📄 ScalarEvolutionDivision.h(2.48 KB)
📄 ScalarEvolutionExpressions.h(28.61 KB)
📄 ScalarEvolutionNormalization.h(2.47 KB)
📄 ScopedNoAliasAA.h(2.83 KB)
📄 SparsePropagation.h(19.43 KB)
📄 StackLifetime.h(6.16 KB)
📄 StackSafetyAnalysis.h(4.91 KB)
📄 SyncDependenceAnalysis.h(2.85 KB)
📄 SyntheticCountsUtils.h(1.85 KB)
📄 TargetFolder.h(11.04 KB)
📄 TargetLibraryInfo.def(55.35 KB)
📄 TargetLibraryInfo.h(16.86 KB)
📄 TargetTransformInfo.h(96.51 KB)
📄 TargetTransformInfoImpl.h(37.63 KB)
📄 Trace.h(4.1 KB)
📄 TypeBasedAliasAnalysis.h(3.05 KB)
📄 TypeMetadataUtils.h(1.94 KB)
📁 Utils
📄 ValueLattice.h(15.14 KB)
📄 ValueLatticeUtils.h(1.66 KB)
📄 ValueTracking.h(35.82 KB)
📄 VecFuncs.def(10.94 KB)
📄 VectorUtils.h(37.26 KB)

Editing: LoopNestAnalysis.h

//===- llvm/Analysis/LoopNestAnalysis.h -------------------------*- 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
//
//===----------------------------------------------------------------------===//
///
/// \file
/// This file defines the interface for the loop nest analysis.
///
//===----------------------------------------------------------------------===//

#ifndef LLVM_ANALYSIS_LOOPNESTANALYSIS_H
#define LLVM_ANALYSIS_LOOPNESTANALYSIS_H

#include "llvm/Analysis/LoopAnalysisManager.h"
#include "llvm/Analysis/LoopInfo.h"

namespace llvm {

using LoopVectorTy = SmallVector<Loop *, 8>;
class LPMUpdater;

/// This class represents a loop nest and can be used to query its properties.
class LoopNest {
public:
  /// Construct a loop nest rooted by loop \p Root.
  LoopNest(Loop &Root, ScalarEvolution &SE);

LoopNest() = delete;
  LoopNest &operator=(const LoopNest &) = delete;

/// Construct a LoopNest object.
  static std::unique_ptr<LoopNest> getLoopNest(Loop &Root, ScalarEvolution &SE);

/// Return true if the given loops \p OuterLoop and \p InnerLoop are
  /// perfectly nested with respect to each other, and false otherwise.
  /// Example:
  /// \code
  ///   for(i)
  ///     for(j)
  ///       for(k)
  /// \endcode
  /// arePerfectlyNested(loop_i, loop_j, SE) would return true.
  /// arePerfectlyNested(loop_j, loop_k, SE) would return true.
  /// arePerfectlyNested(loop_i, loop_k, SE) would return false.
  static bool arePerfectlyNested(const Loop &OuterLoop, const Loop &InnerLoop,
                                 ScalarEvolution &SE);

/// Return the maximum nesting depth of the loop nest rooted by loop \p Root.
  /// For example given the loop nest:
  /// \code
  ///   for(i)     // loop at level 1 and Root of the nest
  ///     for(j)   // loop at level 2
  ///       <code>
  ///       for(k) // loop at level 3
  /// \endcode
  /// getMaxPerfectDepth(Loop_i) would return 2.
  static unsigned getMaxPerfectDepth(const Loop &Root, ScalarEvolution &SE);

/// Return the outermost loop in the loop nest.
  Loop &getOutermostLoop() const { return *Loops.front(); }

/// Return the innermost loop in the loop nest if the nest has only one
  /// innermost loop, and a nullptr otherwise.
  /// Note: the innermost loop returned is not necessarily perfectly nested.
  Loop *getInnermostLoop() const {
    if (Loops.size() == 1)
      return Loops.back();

// The loops in the 'Loops' vector have been collected in breadth first
    // order, therefore if the last 2 loops in it have the same nesting depth
    // there isn't a unique innermost loop in the nest.
    Loop *LastLoop = Loops.back();
    auto SecondLastLoopIter = ++Loops.rbegin();
    return (LastLoop->getLoopDepth() == (*SecondLastLoopIter)->getLoopDepth())
               ? nullptr
               : LastLoop;
  }

/// Return the loop at the given \p Index.
  Loop *getLoop(unsigned Index) const {
    assert(Index < Loops.size() && "Index is out of bounds");
    return Loops[Index];
  }

/// Return the number of loops in the nest.
  size_t getNumLoops() const { return Loops.size(); }

/// Get the loops in the nest.
  ArrayRef<Loop *> getLoops() const { return Loops; }

/// Retrieve a vector of perfect loop nests contained in the current loop
  /// nest. For example, given the following  nest containing 4 loops, this
  /// member function would return {{L1,L2},{L3,L4}}.
  /// \code
  ///   for(i) // L1
  ///     for(j) // L2
  ///       <code>
  ///       for(k) // L3
  ///         for(l) // L4
  /// \endcode
  SmallVector<LoopVectorTy, 4> getPerfectLoops(ScalarEvolution &SE) const;

/// Return the loop nest depth (i.e. the loop depth of the 'deepest' loop)
  /// For example given the loop nest:
  /// \code
  ///   for(i)      // loop at level 1 and Root of the nest
  ///     for(j1)   // loop at level 2
  ///       for(k)  // loop at level 3
  ///     for(j2)   // loop at level 2
  /// \endcode
  /// getNestDepth() would return 3.
  unsigned getNestDepth() const {
    int NestDepth =
        Loops.back()->getLoopDepth() - Loops.front()->getLoopDepth() + 1;
    assert(NestDepth > 0 && "Expecting NestDepth to be at least 1");
    return NestDepth;
  }

/// Return the maximum perfect nesting depth.
  unsigned getMaxPerfectDepth() const { return MaxPerfectDepth; }

/// Return true if all loops in the loop nest are in simplify form.
  bool areAllLoopsSimplifyForm() const {
    return llvm::all_of(Loops,
                        [](const Loop *L) { return L->isLoopSimplifyForm(); });
  }

protected:
  const unsigned MaxPerfectDepth; // maximum perfect nesting depth level.
  LoopVectorTy Loops; // the loops in the nest (in breadth first order).
};

raw_ostream &operator<<(raw_ostream &, const LoopNest &);

/// This analysis provides information for a loop nest. The analysis runs on
/// demand and can be initiated via AM.getResult<LoopNestAnalysis>.
class LoopNestAnalysis : public AnalysisInfoMixin<LoopNestAnalysis> {
  friend AnalysisInfoMixin<LoopNestAnalysis>;
  static AnalysisKey Key;

public:
  using Result = LoopNest;
  Result run(Loop &L, LoopAnalysisManager &AM, LoopStandardAnalysisResults &AR);
};

/// Printer pass for the \c LoopNest results.
class LoopNestPrinterPass : public PassInfoMixin<LoopNestPrinterPass> {
  raw_ostream &OS;

public:
  explicit LoopNestPrinterPass(raw_ostream &OS) : OS(OS) {}

PreservedAnalyses run(Loop &L, LoopAnalysisManager &AM,
                        LoopStandardAnalysisResults &AR, LPMUpdater &U);
};

} // namespace llvm

#endif // LLVM_ANALYSIS_LOOPNESTANALYSIS_H

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