LCOV - code coverage report
Current view: top level - include/llvm/Analysis - BlockFrequencyInfo.h (source / functions) Hit Total Coverage
Test: llvm-toolchain.info Lines: 4 4 100.0 %
Date: 2018-07-13 00:08:38 Functions: 4 4 100.0 %
Legend: Lines: hit not hit

          Line data    Source code
       1             : //===- BlockFrequencyInfo.h - Block Frequency Analysis ----------*- 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             : //
      10             : // Loops should be simplified before this analysis.
      11             : //
      12             : //===----------------------------------------------------------------------===//
      13             : 
      14             : #ifndef LLVM_ANALYSIS_BLOCKFREQUENCYINFO_H
      15             : #define LLVM_ANALYSIS_BLOCKFREQUENCYINFO_H
      16             : 
      17             : #include "llvm/ADT/Optional.h"
      18             : #include "llvm/IR/PassManager.h"
      19             : #include "llvm/Pass.h"
      20             : #include "llvm/Support/BlockFrequency.h"
      21             : #include <cstdint>
      22             : #include <memory>
      23             : 
      24             : namespace llvm {
      25             : 
      26             : class BasicBlock;
      27             : class BranchProbabilityInfo;
      28             : class Function;
      29             : class LoopInfo;
      30             : class Module;
      31             : class raw_ostream;
      32             : template <class BlockT> class BlockFrequencyInfoImpl;
      33             : 
      34             : enum PGOViewCountsType { PGOVCT_None, PGOVCT_Graph, PGOVCT_Text };
      35             : 
      36             : /// BlockFrequencyInfo pass uses BlockFrequencyInfoImpl implementation to
      37             : /// estimate IR basic block frequencies.
      38      593672 : class BlockFrequencyInfo {
      39             :   using ImplType = BlockFrequencyInfoImpl<BasicBlock>;
      40             : 
      41             :   std::unique_ptr<ImplType> BFI;
      42             : 
      43             : public:
      44             :   BlockFrequencyInfo();
      45             :   BlockFrequencyInfo(const Function &F, const BranchProbabilityInfo &BPI,
      46             :                      const LoopInfo &LI);
      47             :   BlockFrequencyInfo(const BlockFrequencyInfo &) = delete;
      48             :   BlockFrequencyInfo &operator=(const BlockFrequencyInfo &) = delete;
      49             :   BlockFrequencyInfo(BlockFrequencyInfo &&Arg);
      50             :   BlockFrequencyInfo &operator=(BlockFrequencyInfo &&RHS);
      51             :   ~BlockFrequencyInfo();
      52             : 
      53             :   /// Handle invalidation explicitly.
      54             :   bool invalidate(Function &F, const PreservedAnalyses &PA,
      55             :                   FunctionAnalysisManager::Invalidator &);
      56             : 
      57             :   const Function *getFunction() const;
      58             :   const BranchProbabilityInfo *getBPI() const;
      59             :   void view() const;
      60             : 
      61             :   /// getblockFreq - Return block frequency. Return 0 if we don't have the
      62             :   /// information. Please note that initial frequency is equal to ENTRY_FREQ. It
      63             :   /// means that we should not rely on the value itself, but only on the
      64             :   /// comparison to the other block frequencies. We do this to avoid using of
      65             :   /// floating points.
      66             :   BlockFrequency getBlockFreq(const BasicBlock *BB) const;
      67             : 
      68             :   /// Returns the estimated profile count of \p BB.
      69             :   /// This computes the relative block frequency of \p BB and multiplies it by
      70             :   /// the enclosing function's count (if available) and returns the value.
      71             :   Optional<uint64_t> getBlockProfileCount(const BasicBlock *BB) const;
      72             : 
      73             :   /// Returns the estimated profile count of \p Freq.
      74             :   /// This uses the frequency \p Freq and multiplies it by
      75             :   /// the enclosing function's count (if available) and returns the value.
      76             :   Optional<uint64_t> getProfileCountFromFreq(uint64_t Freq) const;
      77             : 
      78             :   /// Returns true if \p BB is an irreducible loop header
      79             :   /// block. Otherwise false.
      80             :   bool isIrrLoopHeader(const BasicBlock *BB);
      81             : 
      82             :   // Set the frequency of the given basic block.
      83             :   void setBlockFreq(const BasicBlock *BB, uint64_t Freq);
      84             : 
      85             :   /// Set the frequency of \p ReferenceBB to \p Freq and scale the frequencies
      86             :   /// of the blocks in \p BlocksToScale such that their frequencies relative
      87             :   /// to \p ReferenceBB remain unchanged.
      88             :   void setBlockFreqAndScale(const BasicBlock *ReferenceBB, uint64_t Freq,
      89             :                             SmallPtrSetImpl<BasicBlock *> &BlocksToScale);
      90             : 
      91             :   /// calculate - compute block frequency info for the given function.
      92             :   void calculate(const Function &F, const BranchProbabilityInfo &BPI,
      93             :                  const LoopInfo &LI);
      94             : 
      95             :   // Print the block frequency Freq to OS using the current functions entry
      96             :   // frequency to convert freq into a relative decimal form.
      97             :   raw_ostream &printBlockFreq(raw_ostream &OS, const BlockFrequency Freq) const;
      98             : 
      99             :   // Convenience method that attempts to look up the frequency associated with
     100             :   // BB and print it to OS.
     101             :   raw_ostream &printBlockFreq(raw_ostream &OS, const BasicBlock *BB) const;
     102             : 
     103             :   uint64_t getEntryFreq() const;
     104             :   void releaseMemory();
     105             :   void print(raw_ostream &OS) const;
     106             : };
     107             : 
     108             : /// Analysis pass which computes \c BlockFrequencyInfo.
     109             : class BlockFrequencyAnalysis
     110             :     : public AnalysisInfoMixin<BlockFrequencyAnalysis> {
     111             :   friend AnalysisInfoMixin<BlockFrequencyAnalysis>;
     112             : 
     113             :   static AnalysisKey Key;
     114             : 
     115             : public:
     116             :   /// Provide the result type for this analysis pass.
     117             :   using Result = BlockFrequencyInfo;
     118             : 
     119             :   /// Run the analysis pass over a function and produce BFI.
     120             :   Result run(Function &F, FunctionAnalysisManager &AM);
     121             : };
     122             : 
     123             : /// Printer pass for the \c BlockFrequencyInfo results.
     124             : class BlockFrequencyPrinterPass
     125             :     : public PassInfoMixin<BlockFrequencyPrinterPass> {
     126             :   raw_ostream &OS;
     127             : 
     128             : public:
     129          13 :   explicit BlockFrequencyPrinterPass(raw_ostream &OS) : OS(OS) {}
     130             : 
     131             :   PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM);
     132             : };
     133             : 
     134             : /// Legacy analysis pass which computes \c BlockFrequencyInfo.
     135       93357 : class BlockFrequencyInfoWrapperPass : public FunctionPass {
     136             :   BlockFrequencyInfo BFI;
     137             : 
     138             : public:
     139             :   static char ID;
     140             : 
     141             :   BlockFrequencyInfoWrapperPass();
     142             :   ~BlockFrequencyInfoWrapperPass() override;
     143             : 
     144      238532 :   BlockFrequencyInfo &getBFI() { return BFI; }
     145             :   const BlockFrequencyInfo &getBFI() const { return BFI; }
     146             : 
     147             :   void getAnalysisUsage(AnalysisUsage &AU) const override;
     148             : 
     149             :   bool runOnFunction(Function &F) override;
     150             :   void releaseMemory() override;
     151             :   void print(raw_ostream &OS, const Module *M) const override;
     152             : };
     153             : 
     154             : } // end namespace llvm
     155             : 
     156             : #endif // LLVM_ANALYSIS_BLOCKFREQUENCYINFO_H

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