85 lines
2.9 KiB
C
85 lines
2.9 KiB
C
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//===-- SpeculateAnalyses.h --*- 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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/// Contains the Analyses and Result Interpretation to select likely functions
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/// to Speculatively compile before they are called. [Purely Experimentation]
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_EXECUTIONENGINE_ORC_SPECULATEANALYSES_H
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#define LLVM_EXECUTIONENGINE_ORC_SPECULATEANALYSES_H
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#include "llvm/Analysis/BranchProbabilityInfo.h"
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#include "llvm/ExecutionEngine/Orc/Core.h"
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#include "llvm/ExecutionEngine/Orc/Speculation.h"
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#include <vector>
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namespace llvm {
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namespace orc {
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// Provides common code.
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class SpeculateQuery {
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protected:
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void findCalles(const BasicBlock *, DenseSet<StringRef> &);
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bool isStraightLine(const Function &F);
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public:
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using ResultTy = Optional<DenseMap<StringRef, DenseSet<StringRef>>>;
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};
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// Direct calls in high frequency basic blocks are extracted.
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class BlockFreqQuery : public SpeculateQuery {
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size_t numBBToGet(size_t);
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public:
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// Find likely next executables based on IR Block Frequency
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ResultTy operator()(Function &F);
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};
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// This Query generates a sequence of basic blocks which follows the order of
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// execution.
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// A handful of BB with higher block frequencies are taken, then path to entry
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// and end BB are discovered by traversing up & down the CFG.
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class SequenceBBQuery : public SpeculateQuery {
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struct WalkDirection {
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bool Upward = true, Downward = true;
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// the block associated contain a call
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bool CallerBlock = false;
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};
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public:
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using VisitedBlocksInfoTy = DenseMap<const BasicBlock *, WalkDirection>;
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using BlockListTy = SmallVector<const BasicBlock *, 8>;
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using BackEdgesInfoTy =
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SmallVector<std::pair<const BasicBlock *, const BasicBlock *>, 8>;
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using BlockFreqInfoTy =
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SmallVector<std::pair<const BasicBlock *, uint64_t>, 8>;
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private:
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std::size_t getHottestBlocks(std::size_t TotalBlocks);
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BlockListTy rearrangeBB(const Function &, const BlockListTy &);
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BlockListTy queryCFG(Function &, const BlockListTy &);
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void traverseToEntryBlock(const BasicBlock *, const BlockListTy &,
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const BackEdgesInfoTy &,
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const BranchProbabilityInfo *,
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VisitedBlocksInfoTy &);
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void traverseToExitBlock(const BasicBlock *, const BlockListTy &,
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const BackEdgesInfoTy &,
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const BranchProbabilityInfo *,
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VisitedBlocksInfoTy &);
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public:
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ResultTy operator()(Function &F);
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};
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} // namespace orc
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} // namespace llvm
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#endif // LLVM_EXECUTIONENGINE_ORC_SPECULATEANALYSES_H
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