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//===- AMDGPUAliasAnalysis --------------------------------------*- 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 AMGPU address space based alias analysis pass.
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIB_TARGET_AMDGPU_AMDGPUALIASANALYSIS_H
#define LLVM_LIB_TARGET_AMDGPU_AMDGPUALIASANALYSIS_H
#include "AMDGPU.h"
#include "llvm/ADT/Triple.h"
#include "llvm/Analysis/AliasAnalysis.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/Module.h"
#include "llvm/Pass.h"
#include <algorithm>
#include <memory>
namespace llvm {
class DataLayout;
class MDNode;
class MemoryLocation;
/// A simple AA result that uses TBAA metadata to answer queries.
class AMDGPUAAResult : public AAResultBase<AMDGPUAAResult> {
friend AAResultBase<AMDGPUAAResult>;
const DataLayout &DL;
AMDGPUAS AS;
public:
explicit AMDGPUAAResult(const DataLayout &DL, Triple T) : AAResultBase(),
DL(DL), AS(AMDGPU::getAMDGPUAS(T)), ASAliasRules(AS, T.getArch()) {}
AMDGPUAAResult(AMDGPUAAResult &&Arg)
: AAResultBase(std::move(Arg)), DL(Arg.DL), AS(Arg.AS),
ASAliasRules(Arg.ASAliasRules){}
/// Handle invalidation events from the new pass manager.
///
/// By definition, this result is stateless and so remains valid.
bool invalidate(Function &, const PreservedAnalyses &) { return false; }
AliasResult alias(const MemoryLocation &LocA, const MemoryLocation &LocB);
bool pointsToConstantMemory(const MemoryLocation &Loc, bool OrLocal);
private:
bool Aliases(const MDNode *A, const MDNode *B) const;
bool PathAliases(const MDNode *A, const MDNode *B) const;
class ASAliasRulesTy {
public:
ASAliasRulesTy(AMDGPUAS AS_, Triple::ArchType Arch_);
AliasResult getAliasResult(unsigned AS1, unsigned AS2) const;
private:
Triple::ArchType Arch;
AMDGPUAS AS;
const AliasResult (*ASAliasRules)[6][6];
} ASAliasRules;
};
/// Analysis pass providing a never-invalidated alias analysis result.
class AMDGPUAA : public AnalysisInfoMixin<AMDGPUAA> {
friend AnalysisInfoMixin<AMDGPUAA>;
static char PassID;
public:
using Result = AMDGPUAAResult;
AMDGPUAAResult run(Function &F, AnalysisManager<Function> &AM) {
return AMDGPUAAResult(F.getParent()->getDataLayout(),
Triple(F.getParent()->getTargetTriple()));
}
};
/// Legacy wrapper pass to provide the AMDGPUAAResult object.
class AMDGPUAAWrapperPass : public ImmutablePass {
std::unique_ptr<AMDGPUAAResult> Result;
public:
static char ID;
AMDGPUAAWrapperPass() : ImmutablePass(ID) {
initializeAMDGPUAAWrapperPassPass(*PassRegistry::getPassRegistry());
}
AMDGPUAAResult &getResult() { return *Result; }
const AMDGPUAAResult &getResult() const { return *Result; }
bool doInitialization(Module &M) override {
Result.reset(new AMDGPUAAResult(M.getDataLayout(),
Triple(M.getTargetTriple())));
return false;
}
bool doFinalization(Module &M) override {
Result.reset();
return false;
}
void getAnalysisUsage(AnalysisUsage &AU) const override;
};
} // end namespace llvm
#endif // LLVM_LIB_TARGET_AMDGPU_AMDGPUALIASANALYSIS_H
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