diff options
Diffstat (limited to 'include/llvm/Analysis/ScalarEvolutionAliasAnalysis.h')
| -rw-r--r-- | include/llvm/Analysis/ScalarEvolutionAliasAnalysis.h | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/include/llvm/Analysis/ScalarEvolutionAliasAnalysis.h b/include/llvm/Analysis/ScalarEvolutionAliasAnalysis.h new file mode 100644 index 000000000000..7bbbf5562047 --- /dev/null +++ b/include/llvm/Analysis/ScalarEvolutionAliasAnalysis.h @@ -0,0 +1,79 @@ +//===- ScalarEvolutionAliasAnalysis.h - SCEV-based AA -----------*- C++ -*-===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +/// \file +/// This is the interface for a SCEV-based alias analysis. +/// +//===----------------------------------------------------------------------===// + +#ifndef LLVM_ANALYSIS_SCALAREVOLUTIONALIASANALYSIS_H +#define LLVM_ANALYSIS_SCALAREVOLUTIONALIASANALYSIS_H + +#include "llvm/Analysis/AliasAnalysis.h" +#include "llvm/Analysis/ScalarEvolutionExpressions.h" +#include "llvm/IR/Function.h" +#include "llvm/IR/Module.h" +#include "llvm/Pass.h" + +namespace llvm { + +/// A simple alias analysis implementation that uses ScalarEvolution to answer +/// queries. +class SCEVAAResult : public AAResultBase<SCEVAAResult> { + ScalarEvolution &SE; + +public: + explicit SCEVAAResult(const TargetLibraryInfo &TLI, ScalarEvolution &SE) + : AAResultBase(TLI), SE(SE) {} + SCEVAAResult(SCEVAAResult &&Arg) : AAResultBase(std::move(Arg)), SE(Arg.SE) {} + + AliasResult alias(const MemoryLocation &LocA, const MemoryLocation &LocB); + +private: + Value *GetBaseValue(const SCEV *S); +}; + +/// Analysis pass providing a never-invalidated alias analysis result. +class SCEVAA { +public: + typedef SCEVAAResult Result; + + /// \brief Opaque, unique identifier for this analysis pass. + static void *ID() { return (void *)&PassID; } + + SCEVAAResult run(Function &F, AnalysisManager<Function> *AM); + + /// \brief Provide access to a name for this pass for debugging purposes. + static StringRef name() { return "SCEVAA"; } + +private: + static char PassID; +}; + +/// Legacy wrapper pass to provide the SCEVAAResult object. +class SCEVAAWrapperPass : public FunctionPass { + std::unique_ptr<SCEVAAResult> Result; + +public: + static char ID; + + SCEVAAWrapperPass(); + + SCEVAAResult &getResult() { return *Result; } + const SCEVAAResult &getResult() const { return *Result; } + + bool runOnFunction(Function &F) override; + void getAnalysisUsage(AnalysisUsage &AU) const override; +}; + +/// Creates an instance of \c SCEVAAWrapperPass. +FunctionPass *createSCEVAAWrapperPass(); + +} + +#endif |
