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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
76 lines
2.8 KiB
C++
76 lines
2.8 KiB
C++
///===- LazyMachineBlockFrequencyInfo.h - Lazy Block Frequency -*- 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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/// \file
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/// This is an alternative analysis pass to MachineBlockFrequencyInfo. The
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/// difference is that with this pass the block frequencies are not computed
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/// when the analysis pass is executed but rather when the BFI result is
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/// explicitly requested by the analysis client.
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///
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///===---------------------------------------------------------------------===//
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#ifndef LLVM_ANALYSIS_LAZYMACHINEBLOCKFREQUENCYINFO_H
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#define LLVM_ANALYSIS_LAZYMACHINEBLOCKFREQUENCYINFO_H
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#include "llvm/CodeGen/MachineBlockFrequencyInfo.h"
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#include "llvm/CodeGen/MachineBranchProbabilityInfo.h"
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#include "llvm/CodeGen/MachineDominators.h"
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#include "llvm/CodeGen/MachineLoopInfo.h"
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namespace llvm {
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/// This is an alternative analysis pass to MachineBlockFrequencyInfo.
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/// The difference is that with this pass, the block frequencies are not
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/// computed when the analysis pass is executed but rather when the BFI result
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/// is explicitly requested by the analysis client.
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///
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/// This works by checking querying if MBFI is available and otherwise
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/// generating MBFI on the fly. In this case the passes required for (LI, DT)
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/// are also queried before being computed on the fly.
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///
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/// Note that it is expected that we wouldn't need this functionality for the
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/// new PM since with the new PM, analyses are executed on demand.
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class LazyMachineBlockFrequencyInfoPass : public MachineFunctionPass {
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private:
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/// If generated on the fly this own the instance.
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mutable std::unique_ptr<MachineBlockFrequencyInfo> OwnedMBFI;
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/// If generated on the fly this own the instance.
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mutable std::unique_ptr<MachineLoopInfo> OwnedMLI;
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/// If generated on the fly this own the instance.
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mutable std::unique_ptr<MachineDominatorTree> OwnedMDT;
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/// The function.
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MachineFunction *MF = nullptr;
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/// Calculate MBFI and all other analyses that's not available and
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/// required by BFI.
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MachineBlockFrequencyInfo &calculateIfNotAvailable() const;
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public:
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static char ID;
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LazyMachineBlockFrequencyInfoPass();
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/// Compute and return the block frequencies.
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MachineBlockFrequencyInfo &getBFI() { return calculateIfNotAvailable(); }
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/// Compute and return the block frequencies.
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const MachineBlockFrequencyInfo &getBFI() const {
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return calculateIfNotAvailable();
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}
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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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void print(raw_ostream &OS, const Module *M) const override;
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};
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}
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#endif
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