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85 lines
3.0 KiB
C++
85 lines
3.0 KiB
C++
//===- MachineBlockFrequencyInfo.h - MBB Frequency Analysis -----*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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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 <cstdint>
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#include <memory>
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namespace llvm {
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template <class BlockT> class BlockFrequencyInfoImpl;
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class MachineBasicBlock;
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class MachineBranchProbabilityInfo;
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class MachineFunction;
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class MachineLoopInfo;
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class raw_ostream;
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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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using ImplType = BlockFrequencyInfoImpl<MachineBasicBlock>;
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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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/// calculate - compute block frequency info for the given function.
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void calculate(const MachineFunction &F,
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const MachineBranchProbabilityInfo &MBPI,
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const MachineLoopInfo &MLI);
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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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bool isIrrLoopHeader(const MachineBasicBlock *MBB);
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const MachineFunction *getFunction() const;
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const MachineBranchProbabilityInfo *getMBPI() const;
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void view(const Twine &Name, bool isSimple = true) 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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} // end namespace llvm
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#endif // LLVM_CODEGEN_MACHINEBLOCKFREQUENCYINFO_H
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