lib/Target/AMDGPU/AMDGPUAliasAnalysis.h

   1 //===- AMDGPUAliasAnalysis --------------------------------------*- C++ -*-===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 /// \file
  10 /// This is the AMGPU address space based alias analysis pass.
  11 //===----------------------------------------------------------------------===//
  12
  13 #ifndef LLVM_LIB_TARGET_AMDGPU_AMDGPUALIASANALYSIS_H
  14 #define LLVM_LIB_TARGET_AMDGPU_AMDGPUALIASANALYSIS_H
  15
  16 #include "AMDGPU.h"
  17 #include "llvm/ADT/Triple.h"
  18 #include "llvm/Analysis/AliasAnalysis.h"
  19 #include "llvm/IR/Function.h"
  20 #include "llvm/IR/Module.h"
  21 #include "llvm/Pass.h"
  22 #include <algorithm>
  23 #include <memory>
  24
  25 namespace llvm {
  26
  27 class DataLayout;
  28 class MDNode;
  29 class MemoryLocation;
  30
  31 /// A simple AA result that uses TBAA metadata to answer queries.
  32 class AMDGPUAAResult : public AAResultBase<AMDGPUAAResult> {
  33   friend AAResultBase<AMDGPUAAResult>;
  34
  35   const DataLayout &DL;
  36
  37 public:
  38   explicit AMDGPUAAResult(const DataLayout &DL, Triple T) : AAResultBase(),
  39     DL(DL) {}
  40   AMDGPUAAResult(AMDGPUAAResult &&Arg)
  41       : AAResultBase(std::move(Arg)), DL(Arg.DL) {}
  42
  43   /// Handle invalidation events from the new pass manager.
  44   ///
  45   /// By definition, this result is stateless and so remains valid.
  46   bool invalidate(Function &, const PreservedAnalyses &) { return false; }
  47
  48   AliasResult alias(const MemoryLocation &LocA, const MemoryLocation &LocB);
  49   bool pointsToConstantMemory(const MemoryLocation &Loc, bool OrLocal);
  50
  51 private:
  52   bool Aliases(const MDNode *A, const MDNode *B) const;
  53   bool PathAliases(const MDNode *A, const MDNode *B) const;
  54 };
  55
  56 /// Analysis pass providing a never-invalidated alias analysis result.
  57 class AMDGPUAA : public AnalysisInfoMixin<AMDGPUAA> {
  58   friend AnalysisInfoMixin<AMDGPUAA>;
  59
  60   static char PassID;
  61
  62 public:
  63   using Result = AMDGPUAAResult;
  64
  65   AMDGPUAAResult run(Function &F, AnalysisManager<Function> &AM) {
  66     return AMDGPUAAResult(F.getParent()->getDataLayout(),
  67         Triple(F.getParent()->getTargetTriple()));
  68   }
  69 };
  70
  71 /// Legacy wrapper pass to provide the AMDGPUAAResult object.
  72 class AMDGPUAAWrapperPass : public ImmutablePass {
  73   std::unique_ptr<AMDGPUAAResult> Result;
  74
  75 public:
  76   static char ID;
  77
  78   AMDGPUAAWrapperPass() : ImmutablePass(ID) {
  79     initializeAMDGPUAAWrapperPassPass(*PassRegistry::getPassRegistry());
  80   }
  81
  82   AMDGPUAAResult &getResult() { return *Result; }
  83   const AMDGPUAAResult &getResult() const { return *Result; }
  84
  85   bool doInitialization(Module &M) override {
  86     Result.reset(new AMDGPUAAResult(M.getDataLayout(),
  87         Triple(M.getTargetTriple())));
  88     return false;
  89   }
  90
  91   bool doFinalization(Module &M) override {
  92     Result.reset();
  93     return false;
  94   }
  95
  96   void getAnalysisUsage(AnalysisUsage &AU) const override;
  97 };
  98
  99 } // end namespace llvm
 100
 101 #endif // LLVM_LIB_TARGET_AMDGPU_AMDGPUALIASANALYSIS_H