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217476e284
Added ability to estimate the entry count of the extracted function and the branch probabilities of the exit branches. Patch by River Riddle! Differential Revision: https://reviews.llvm.org/D22744 llvm-svn: 277411
77 lines
2.5 KiB
C++
77 lines
2.5 KiB
C++
//===- MachineBlockFrequencyInfo.h - MBB Frequency Analysis -*- 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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// Loops should be simplified before this analysis.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CODEGEN_MACHINEBLOCKFREQUENCYINFO_H
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#define LLVM_CODEGEN_MACHINEBLOCKFREQUENCYINFO_H
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#include "llvm/ADT/Optional.h"
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#include "llvm/CodeGen/MachineFunctionPass.h"
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#include "llvm/Support/BlockFrequency.h"
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#include <climits>
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namespace llvm {
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class MachineBasicBlock;
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class MachineBranchProbabilityInfo;
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template <class BlockT> class BlockFrequencyInfoImpl;
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/// MachineBlockFrequencyInfo pass uses BlockFrequencyInfoImpl implementation
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/// to estimate machine basic block frequencies.
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class MachineBlockFrequencyInfo : public MachineFunctionPass {
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typedef BlockFrequencyInfoImpl<MachineBasicBlock> ImplType;
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std::unique_ptr<ImplType> MBFI;
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public:
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static char ID;
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MachineBlockFrequencyInfo();
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~MachineBlockFrequencyInfo() override;
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void getAnalysisUsage(AnalysisUsage &AU) const override;
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bool runOnMachineFunction(MachineFunction &F) override;
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void releaseMemory() override;
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/// getblockFreq - Return block frequency. Return 0 if we don't have the
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/// information. Please note that initial frequency is equal to 1024. It means
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/// that we should not rely on the value itself, but only on the comparison to
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/// the other block frequencies. We do this to avoid using of floating points.
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///
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BlockFrequency getBlockFreq(const MachineBasicBlock *MBB) const;
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Optional<uint64_t> getBlockProfileCount(const MachineBasicBlock *MBB) const;
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Optional<uint64_t> getProfileCountFromFreq(uint64_t Freq) const;
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const MachineFunction *getFunction() const;
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const MachineBranchProbabilityInfo *getMBPI() const;
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void view() const;
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// Print the block frequency Freq to OS using the current functions entry
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// frequency to convert freq into a relative decimal form.
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raw_ostream &printBlockFreq(raw_ostream &OS, const BlockFrequency Freq) const;
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// Convenience method that attempts to look up the frequency associated with
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// BB and print it to OS.
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raw_ostream &printBlockFreq(raw_ostream &OS,
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const MachineBasicBlock *MBB) const;
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uint64_t getEntryFreq() const;
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};
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}
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#endif
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