Details | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 14 | pmbaty | 1 | //===-- SpeculateAnalyses.h --*- C++ -*-===// |
| 2 | // |
||
| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
||
| 4 | // See https://llvm.org/LICENSE.txt for license information. |
||
| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
||
| 6 | // |
||
| 7 | //===----------------------------------------------------------------------===// |
||
| 8 | /// \file |
||
| 9 | /// Contains the Analyses and Result Interpretation to select likely functions |
||
| 10 | /// to Speculatively compile before they are called. [Purely Experimentation] |
||
| 11 | //===----------------------------------------------------------------------===// |
||
| 12 | |||
| 13 | #ifndef LLVM_EXECUTIONENGINE_ORC_SPECULATEANALYSES_H |
||
| 14 | #define LLVM_EXECUTIONENGINE_ORC_SPECULATEANALYSES_H |
||
| 15 | |||
| 16 | #include "llvm/Analysis/BranchProbabilityInfo.h" |
||
| 17 | #include "llvm/ExecutionEngine/Orc/Core.h" |
||
| 18 | #include "llvm/ExecutionEngine/Orc/Speculation.h" |
||
| 19 | |||
| 20 | #include <vector> |
||
| 21 | |||
| 22 | namespace llvm { |
||
| 23 | |||
| 24 | namespace orc { |
||
| 25 | |||
| 26 | // Provides common code. |
||
| 27 | class SpeculateQuery { |
||
| 28 | protected: |
||
| 29 | void findCalles(const BasicBlock *, DenseSet<StringRef> &); |
||
| 30 | bool isStraightLine(const Function &F); |
||
| 31 | |||
| 32 | public: |
||
| 33 | using ResultTy = std::optional<DenseMap<StringRef, DenseSet<StringRef>>>; |
||
| 34 | }; |
||
| 35 | |||
| 36 | // Direct calls in high frequency basic blocks are extracted. |
||
| 37 | class BlockFreqQuery : public SpeculateQuery { |
||
| 38 | size_t numBBToGet(size_t); |
||
| 39 | |||
| 40 | public: |
||
| 41 | // Find likely next executables based on IR Block Frequency |
||
| 42 | ResultTy operator()(Function &F); |
||
| 43 | }; |
||
| 44 | |||
| 45 | // This Query generates a sequence of basic blocks which follows the order of |
||
| 46 | // execution. |
||
| 47 | // A handful of BB with higher block frequencies are taken, then path to entry |
||
| 48 | // and end BB are discovered by traversing up & down the CFG. |
||
| 49 | class SequenceBBQuery : public SpeculateQuery { |
||
| 50 | struct WalkDirection { |
||
| 51 | bool Upward = true, Downward = true; |
||
| 52 | // the block associated contain a call |
||
| 53 | bool CallerBlock = false; |
||
| 54 | }; |
||
| 55 | |||
| 56 | public: |
||
| 57 | using VisitedBlocksInfoTy = DenseMap<const BasicBlock *, WalkDirection>; |
||
| 58 | using BlockListTy = SmallVector<const BasicBlock *, 8>; |
||
| 59 | using BackEdgesInfoTy = |
||
| 60 | SmallVector<std::pair<const BasicBlock *, const BasicBlock *>, 8>; |
||
| 61 | using BlockFreqInfoTy = |
||
| 62 | SmallVector<std::pair<const BasicBlock *, uint64_t>, 8>; |
||
| 63 | |||
| 64 | private: |
||
| 65 | std::size_t getHottestBlocks(std::size_t TotalBlocks); |
||
| 66 | BlockListTy rearrangeBB(const Function &, const BlockListTy &); |
||
| 67 | BlockListTy queryCFG(Function &, const BlockListTy &); |
||
| 68 | void traverseToEntryBlock(const BasicBlock *, const BlockListTy &, |
||
| 69 | const BackEdgesInfoTy &, |
||
| 70 | const BranchProbabilityInfo *, |
||
| 71 | VisitedBlocksInfoTy &); |
||
| 72 | void traverseToExitBlock(const BasicBlock *, const BlockListTy &, |
||
| 73 | const BackEdgesInfoTy &, |
||
| 74 | const BranchProbabilityInfo *, |
||
| 75 | VisitedBlocksInfoTy &); |
||
| 76 | |||
| 77 | public: |
||
| 78 | ResultTy operator()(Function &F); |
||
| 79 | }; |
||
| 80 | |||
| 81 | } // namespace orc |
||
| 82 | } // namespace llvm |
||
| 83 | |||
| 84 | #endif // LLVM_EXECUTIONENGINE_ORC_SPECULATEANALYSES_H |