File Manager

003 File Manager

Current Path: /usr/src/contrib/llvm-project/llvm/lib/Analysis

usr / src / contrib / llvm-project / llvm / lib / Analysis /

📁 ..
📄 AliasAnalysis.cpp(33.55 KB)
📄 AliasAnalysisEvaluator.cpp(15.64 KB)
📄 AliasAnalysisSummary.cpp(3.49 KB)
📄 AliasAnalysisSummary.h(10.17 KB)
📄 AliasSetTracker.cpp(25.86 KB)
📄 Analysis.cpp(5.29 KB)
📄 AssumeBundleQueries.cpp(7.96 KB)
📄 AssumptionCache.cpp(10.94 KB)
📄 BasicAliasAnalysis.cpp(85.81 KB)
📄 BlockFrequencyInfo.cpp(12.39 KB)
📄 BlockFrequencyInfoImpl.cpp(28.6 KB)
📄 BranchProbabilityInfo.cpp(43.48 KB)
📄 CFG.cpp(9.9 KB)
📄 CFGPrinter.cpp(11.2 KB)
📄 CFLAndersAliasAnalysis.cpp(33.01 KB)
📄 CFLGraph.h(21.23 KB)
📄 CFLSteensAliasAnalysis.cpp(13.24 KB)
📄 CGSCCPassManager.cpp(31.2 KB)
📄 CallGraph.cpp(12.86 KB)
📄 CallGraphSCCPass.cpp(26.31 KB)
📄 CallPrinter.cpp(9.48 KB)
📄 CaptureTracking.cpp(15.38 KB)
📄 CmpInstAnalysis.cpp(4.63 KB)
📄 CodeMetrics.cpp(6.99 KB)
📄 ConstantFolding.cpp(105.15 KB)
📄 CostModel.cpp(3.87 KB)
📄 DDG.cpp(11.29 KB)
📄 Delinearization.cpp(4.49 KB)
📄 DemandedBits.cpp(16.27 KB)
📄 DependenceAnalysis.cpp(150.78 KB)
📄 DependenceGraphBuilder.cpp(19.24 KB)
📄 DivergenceAnalysis.cpp(15.59 KB)
📄 DomPrinter.cpp(9.67 KB)
📄 DomTreeUpdater.cpp(15.21 KB)
📄 DominanceFrontier.cpp(3.2 KB)
📄 EHPersonalities.cpp(5.89 KB)
📄 GlobalsModRef.cpp(41 KB)
📄 GuardUtils.cpp(3.27 KB)
📄 HeatUtils.cpp(2.85 KB)
📄 IVDescriptors.cpp(42.28 KB)
📄 IVUsers.cpp(16.12 KB)
📄 IndirectCallPromotionAnalysis.cpp(4.33 KB)
📄 InlineAdvisor.cpp(15.28 KB)
📄 InlineCost.cpp(99.47 KB)
📄 InlineFeaturesAnalysis.cpp(1.59 KB)
📄 InlineSizeEstimatorAnalysis.cpp(10.95 KB)
📄 InstCount.cpp(2.45 KB)
📄 InstructionPrecedenceTracking.cpp(4.8 KB)
📄 InstructionSimplify.cpp(216.91 KB)
📄 Interval.cpp(1.78 KB)
📄 IntervalPartition.cpp(4.5 KB)
📄 LazyBlockFrequencyInfo.cpp(2.81 KB)
📄 LazyBranchProbabilityInfo.cpp(2.96 KB)
📄 LazyCallGraph.cpp(67.33 KB)
📄 LazyValueInfo.cpp(76.38 KB)
📄 LegacyDivergenceAnalysis.cpp(14.82 KB)
📄 Lint.cpp(29.07 KB)
📄 Loads.cpp(20.6 KB)
📄 LoopAccessAnalysis.cpp(88.02 KB)
📄 LoopAnalysisManager.cpp(6.6 KB)
📄 LoopCacheAnalysis.cpp(23.53 KB)
📄 LoopInfo.cpp(37.15 KB)
📄 LoopNestAnalysis.cpp(10.62 KB)
📄 LoopPass.cpp(12.89 KB)
📄 LoopUnrollAnalyzer.cpp(7.26 KB)
📄 MLInlineAdvisor.cpp(11.36 KB)
📄 MemDepPrinter.cpp(5.13 KB)
📄 MemDerefPrinter.cpp(2.53 KB)
📄 MemoryBuiltins.cpp(41.14 KB)
📄 MemoryDependenceAnalysis.cpp(69.89 KB)
📄 MemoryLocation.cpp(7.92 KB)
📄 MemorySSA.cpp(90.16 KB)
📄 MemorySSAUpdater.cpp(57.9 KB)
📄 ModuleDebugInfoPrinter.cpp(4.02 KB)
📄 ModuleSummaryAnalysis.cpp(38.13 KB)
📄 MustExecute.cpp(31.18 KB)
📄 ObjCARCAliasAnalysis.cpp(5.81 KB)
📄 ObjCARCAnalysisUtils.cpp(1.07 KB)
📄 ObjCARCInstKind.cpp(23.15 KB)
📄 OptimizationRemarkEmitter.cpp(4.23 KB)
📄 PHITransAddr.cpp(16.05 KB)
📄 PhiValues.cpp(8.4 KB)
📄 PostDominators.cpp(3.59 KB)
📄 ProfileSummaryInfo.cpp(18.07 KB)
📄 PtrUseVisitor.cpp(1.28 KB)
📄 RegionInfo.cpp(6.5 KB)
📄 RegionPass.cpp(9.23 KB)
📄 RegionPrinter.cpp(8.61 KB)
📄 ReleaseModeModelRunner.cpp(2.83 KB)
📄 ScalarEvolution.cpp(475.26 KB)
📄 ScalarEvolutionAliasAnalysis.cpp(5.96 KB)
📄 ScalarEvolutionDivision.cpp(7.51 KB)
📄 ScalarEvolutionNormalization.cpp(4.59 KB)
📄 ScopedNoAliasAA.cpp(7.38 KB)
📄 StackLifetime.cpp(12.22 KB)
📄 StackSafetyAnalysis.cpp(31.81 KB)
📄 StratifiedSets.h(18.67 KB)
📄 SyncDependenceAnalysis.cpp(12.97 KB)
📄 SyntheticCountsUtils.cpp(3.81 KB)
📄 TFUtils.cpp(8.99 KB)
📄 TargetLibraryInfo.cpp(58.98 KB)
📄 TargetTransformInfo.cpp(48.15 KB)
📄 Trace.cpp(1.8 KB)
📄 TypeBasedAliasAnalysis.cpp(26.04 KB)
📄 TypeMetadataUtils.cpp(5.93 KB)
📄 VFABIDemangling.cpp(16.46 KB)
📄 ValueLattice.cpp(1.19 KB)
📄 ValueLatticeUtils.cpp(1.53 KB)
📄 ValueTracking.cpp(243.08 KB)
📄 VectorUtils.cpp(48.57 KB)
📁 models

Editing: ScalarEvolutionAliasAnalysis.cpp

//===- ScalarEvolutionAliasAnalysis.cpp - SCEV-based Alias Analysis -------===//
//
// 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 defines the ScalarEvolutionAliasAnalysis pass, which implements a
// simple alias analysis implemented in terms of ScalarEvolution queries.
//
// This differs from traditional loop dependence analysis in that it tests
// for dependencies within a single iteration of a loop, rather than
// dependencies between different iterations.
//
// ScalarEvolution has a more complete understanding of pointer arithmetic
// than BasicAliasAnalysis' collection of ad-hoc analyses.
//
//===----------------------------------------------------------------------===//

#include "llvm/Analysis/ScalarEvolutionAliasAnalysis.h"
#include "llvm/InitializePasses.h"
using namespace llvm;

AliasResult SCEVAAResult::alias(const MemoryLocation &LocA,
                                const MemoryLocation &LocB, AAQueryInfo &AAQI) {
  // If either of the memory references is empty, it doesn't matter what the
  // pointer values are. This allows the code below to ignore this special
  // case.
  if (LocA.Size.isZero() || LocB.Size.isZero())
    return NoAlias;

// This is SCEVAAResult. Get the SCEVs!
  const SCEV *AS = SE.getSCEV(const_cast<Value *>(LocA.Ptr));
  const SCEV *BS = SE.getSCEV(const_cast<Value *>(LocB.Ptr));

// If they evaluate to the same expression, it's a MustAlias.
  if (AS == BS)
    return MustAlias;

// If something is known about the difference between the two addresses,
  // see if it's enough to prove a NoAlias.
  if (SE.getEffectiveSCEVType(AS->getType()) ==
      SE.getEffectiveSCEVType(BS->getType())) {
    unsigned BitWidth = SE.getTypeSizeInBits(AS->getType());
    APInt ASizeInt(BitWidth, LocA.Size.hasValue()
                                 ? LocA.Size.getValue()
                                 : MemoryLocation::UnknownSize);
    APInt BSizeInt(BitWidth, LocB.Size.hasValue()
                                 ? LocB.Size.getValue()
                                 : MemoryLocation::UnknownSize);

// Compute the difference between the two pointers.
    const SCEV *BA = SE.getMinusSCEV(BS, AS);

// Test whether the difference is known to be great enough that memory of
    // the given sizes don't overlap. This assumes that ASizeInt and BSizeInt
    // are non-zero, which is special-cased above.
    if (ASizeInt.ule(SE.getUnsignedRange(BA).getUnsignedMin()) &&
        (-BSizeInt).uge(SE.getUnsignedRange(BA).getUnsignedMax()))
      return NoAlias;

// Folding the subtraction while preserving range information can be tricky
    // (because of INT_MIN, etc.); if the prior test failed, swap AS and BS
    // and try again to see if things fold better that way.

// Compute the difference between the two pointers.
    const SCEV *AB = SE.getMinusSCEV(AS, BS);

// Test whether the difference is known to be great enough that memory of
    // the given sizes don't overlap. This assumes that ASizeInt and BSizeInt
    // are non-zero, which is special-cased above.
    if (BSizeInt.ule(SE.getUnsignedRange(AB).getUnsignedMin()) &&
        (-ASizeInt).uge(SE.getUnsignedRange(AB).getUnsignedMax()))
      return NoAlias;
  }

// If ScalarEvolution can find an underlying object, form a new query.
  // The correctness of this depends on ScalarEvolution not recognizing
  // inttoptr and ptrtoint operators.
  Value *AO = GetBaseValue(AS);
  Value *BO = GetBaseValue(BS);
  if ((AO && AO != LocA.Ptr) || (BO && BO != LocB.Ptr))
    if (alias(MemoryLocation(AO ? AO : LocA.Ptr,
                             AO ? LocationSize::unknown() : LocA.Size,
                             AO ? AAMDNodes() : LocA.AATags),
              MemoryLocation(BO ? BO : LocB.Ptr,
                             BO ? LocationSize::unknown() : LocB.Size,
                             BO ? AAMDNodes() : LocB.AATags),
              AAQI) == NoAlias)
      return NoAlias;

// Forward the query to the next analysis.
  return AAResultBase::alias(LocA, LocB, AAQI);
}

/// Given an expression, try to find a base value.
///
/// Returns null if none was found.
Value *SCEVAAResult::GetBaseValue(const SCEV *S) {
  if (const SCEVAddRecExpr *AR = dyn_cast<SCEVAddRecExpr>(S)) {
    // In an addrec, assume that the base will be in the start, rather
    // than the step.
    return GetBaseValue(AR->getStart());
  } else if (const SCEVAddExpr *A = dyn_cast<SCEVAddExpr>(S)) {
    // If there's a pointer operand, it'll be sorted at the end of the list.
    const SCEV *Last = A->getOperand(A->getNumOperands() - 1);
    if (Last->getType()->isPointerTy())
      return GetBaseValue(Last);
  } else if (const SCEVUnknown *U = dyn_cast<SCEVUnknown>(S)) {
    // This is a leaf node.
    return U->getValue();
  }
  // No Identified object found.
  return nullptr;
}

AnalysisKey SCEVAA::Key;

SCEVAAResult SCEVAA::run(Function &F, FunctionAnalysisManager &AM) {
  return SCEVAAResult(AM.getResult<ScalarEvolutionAnalysis>(F));
}

char SCEVAAWrapperPass::ID = 0;
INITIALIZE_PASS_BEGIN(SCEVAAWrapperPass, "scev-aa",
                      "ScalarEvolution-based Alias Analysis", false, true)
INITIALIZE_PASS_DEPENDENCY(ScalarEvolutionWrapperPass)
INITIALIZE_PASS_END(SCEVAAWrapperPass, "scev-aa",
                    "ScalarEvolution-based Alias Analysis", false, true)

FunctionPass *llvm::createSCEVAAWrapperPass() {
  return new SCEVAAWrapperPass();
}

SCEVAAWrapperPass::SCEVAAWrapperPass() : FunctionPass(ID) {
  initializeSCEVAAWrapperPassPass(*PassRegistry::getPassRegistry());
}

bool SCEVAAWrapperPass::runOnFunction(Function &F) {
  Result.reset(
      new SCEVAAResult(getAnalysis<ScalarEvolutionWrapperPass>().getSE()));
  return false;
}

void SCEVAAWrapperPass::getAnalysisUsage(AnalysisUsage &AU) const {
  AU.setPreservesAll();
  AU.addRequired<ScalarEvolutionWrapperPass>();
}

003 File Manager

Editing: ScalarEvolutionAliasAnalysis.cpp

Upload File

Create Folder