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| Rev | Author | Line No. | Line |
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| 14 | pmbaty | 1 | ///===- LazyMachineBlockFrequencyInfo.h - Lazy Block Frequency -*- C++ -*--===// |
| 2 | /// |
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| 3 | /// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | /// See https://llvm.org/LICENSE.txt for license information. |
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| 5 | /// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | /// |
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| 7 | ///===---------------------------------------------------------------------===// |
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| 8 | /// \file |
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| 9 | /// This is an alternative analysis pass to MachineBlockFrequencyInfo. The |
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| 10 | /// difference is that with this pass the block frequencies are not computed |
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| 11 | /// when the analysis pass is executed but rather when the BFI result is |
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| 12 | /// explicitly requested by the analysis client. |
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| 13 | /// |
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| 14 | ///===---------------------------------------------------------------------===// |
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| 15 | |||
| 16 | #ifndef LLVM_CODEGEN_LAZYMACHINEBLOCKFREQUENCYINFO_H |
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| 17 | #define LLVM_CODEGEN_LAZYMACHINEBLOCKFREQUENCYINFO_H |
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| 18 | |||
| 19 | #include "llvm/CodeGen/MachineBlockFrequencyInfo.h" |
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| 20 | #include "llvm/CodeGen/MachineDominators.h" |
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| 21 | #include "llvm/CodeGen/MachineFunctionPass.h" |
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| 22 | #include "llvm/CodeGen/MachineLoopInfo.h" |
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| 23 | |||
| 24 | namespace llvm { |
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| 25 | /// This is an alternative analysis pass to MachineBlockFrequencyInfo. |
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| 26 | /// The difference is that with this pass, the block frequencies are not |
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| 27 | /// computed when the analysis pass is executed but rather when the BFI result |
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| 28 | /// is explicitly requested by the analysis client. |
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| 29 | /// |
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| 30 | /// This works by checking querying if MBFI is available and otherwise |
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| 31 | /// generating MBFI on the fly. In this case the passes required for (LI, DT) |
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| 32 | /// are also queried before being computed on the fly. |
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| 33 | /// |
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| 34 | /// Note that it is expected that we wouldn't need this functionality for the |
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| 35 | /// new PM since with the new PM, analyses are executed on demand. |
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| 36 | |||
| 37 | class LazyMachineBlockFrequencyInfoPass : public MachineFunctionPass { |
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| 38 | private: |
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| 39 | /// If generated on the fly this own the instance. |
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| 40 | mutable std::unique_ptr<MachineBlockFrequencyInfo> OwnedMBFI; |
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| 41 | |||
| 42 | /// If generated on the fly this own the instance. |
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| 43 | mutable std::unique_ptr<MachineLoopInfo> OwnedMLI; |
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| 44 | |||
| 45 | /// If generated on the fly this own the instance. |
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| 46 | mutable std::unique_ptr<MachineDominatorTree> OwnedMDT; |
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| 47 | |||
| 48 | /// The function. |
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| 49 | MachineFunction *MF = nullptr; |
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| 50 | |||
| 51 | /// Calculate MBFI and all other analyses that's not available and |
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| 52 | /// required by BFI. |
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| 53 | MachineBlockFrequencyInfo &calculateIfNotAvailable() const; |
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| 54 | |||
| 55 | public: |
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| 56 | static char ID; |
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| 57 | |||
| 58 | LazyMachineBlockFrequencyInfoPass(); |
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| 59 | |||
| 60 | /// Compute and return the block frequencies. |
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| 61 | MachineBlockFrequencyInfo &getBFI() { return calculateIfNotAvailable(); } |
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| 62 | |||
| 63 | /// Compute and return the block frequencies. |
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| 64 | const MachineBlockFrequencyInfo &getBFI() const { |
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| 65 | return calculateIfNotAvailable(); |
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| 66 | } |
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| 67 | |||
| 68 | void getAnalysisUsage(AnalysisUsage &AU) const override; |
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| 69 | |||
| 70 | bool runOnMachineFunction(MachineFunction &F) override; |
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| 71 | void releaseMemory() override; |
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| 72 | void print(raw_ostream &OS, const Module *M) const override; |
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| 73 | }; |
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| 74 | } |
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| 75 | #endif |