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a874afb484
Summary: This will unify all BB hotness checks. Reviewers: eraman, davidxl Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D26353 llvm-svn: 286415
113 lines
3.6 KiB
C++
113 lines
3.6 KiB
C++
//===- llvm/Analysis/ProfileSummaryInfo.h - profile summary ---*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains a pass that provides access to profile summary
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// information.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_ANALYSIS_PROFILE_SUMMARY_INFO_H
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#define LLVM_ANALYSIS_PROFILE_SUMMARY_INFO_H
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/SmallSet.h"
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#include "llvm/IR/Function.h"
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#include "llvm/IR/Instructions.h"
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#include "llvm/IR/PassManager.h"
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#include "llvm/IR/ProfileSummary.h"
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#include "llvm/IR/ValueHandle.h"
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#include "llvm/Pass.h"
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#include <memory>
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namespace llvm {
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class BasicBlock;
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class BlockFrequencyInfo;
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class ProfileSummary;
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/// \brief Analysis providing profile information.
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///
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/// This is an immutable analysis pass that provides ability to query global
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/// (program-level) profile information. The main APIs are isHotCount and
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/// isColdCount that tells whether a given profile count is considered hot/cold
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/// based on the profile summary. This also provides convenience methods to
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/// check whether a function is hot or cold.
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// FIXME: Provide convenience methods to determine hotness/coldness of other IR
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// units. This would require making this depend on BFI.
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class ProfileSummaryInfo {
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private:
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Module &M;
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std::unique_ptr<ProfileSummary> Summary;
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void computeSummary();
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void computeThresholds();
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// Count thresholds to answer isHotCount and isColdCount queries.
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Optional<uint64_t> HotCountThreshold, ColdCountThreshold;
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public:
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ProfileSummaryInfo(Module &M) : M(M) {}
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ProfileSummaryInfo(ProfileSummaryInfo &&Arg)
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: M(Arg.M), Summary(std::move(Arg.Summary)) {}
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/// \brief Returns true if \p F has hot function entry.
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bool isFunctionEntryHot(const Function *F);
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/// \brief Returns true if \p F has cold function entry.
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bool isFunctionEntryCold(const Function *F);
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/// \brief Returns true if \p F is a hot function.
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bool isHotCount(uint64_t C);
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/// \brief Returns true if count \p C is considered cold.
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bool isColdCount(uint64_t C);
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/// \brief Returns true if BasicBlock \p B is considered hot.
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bool isHotBB(const BasicBlock *B, BlockFrequencyInfo *BFI);
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};
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/// An analysis pass based on legacy pass manager to deliver ProfileSummaryInfo.
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class ProfileSummaryInfoWrapperPass : public ImmutablePass {
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std::unique_ptr<ProfileSummaryInfo> PSI;
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public:
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static char ID;
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ProfileSummaryInfoWrapperPass();
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ProfileSummaryInfo *getPSI() {
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return &*PSI;
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}
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bool doInitialization(Module &M) override;
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bool doFinalization(Module &M) override;
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void getAnalysisUsage(AnalysisUsage &AU) const override {
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AU.setPreservesAll();
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}
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};
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/// An analysis pass based on the new PM to deliver ProfileSummaryInfo.
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class ProfileSummaryAnalysis
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: public AnalysisInfoMixin<ProfileSummaryAnalysis> {
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public:
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typedef ProfileSummaryInfo Result;
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Result run(Module &M, ModuleAnalysisManager &);
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private:
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friend AnalysisInfoMixin<ProfileSummaryAnalysis>;
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static char PassID;
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};
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/// \brief Printer pass that uses \c ProfileSummaryAnalysis.
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class ProfileSummaryPrinterPass
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: public PassInfoMixin<ProfileSummaryPrinterPass> {
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raw_ostream &OS;
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public:
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explicit ProfileSummaryPrinterPass(raw_ostream &OS) : OS(OS) {}
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PreservedAnalyses run(Module &M, ModuleAnalysisManager &AM);
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};
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} // end namespace llvm
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#endif
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