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diff --git a/linux-x64/clang/include/llvm/Analysis/LazyBlockFrequencyInfo.h b/linux-x64/clang/include/llvm/Analysis/LazyBlockFrequencyInfo.h
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+//===- LazyBlockFrequencyInfo.h - Lazy Block Frequency Analysis -*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This is an alternative analysis pass to BlockFrequencyInfoWrapperPass. The
+// difference is that with this pass the block frequencies are not computed when
+// the analysis pass is executed but rather when the BFI result is explicitly
+// requested by the analysis client.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_ANALYSIS_LAZYBLOCKFREQUENCYINFO_H
+#define LLVM_ANALYSIS_LAZYBLOCKFREQUENCYINFO_H
+
+#include "llvm/Analysis/BlockFrequencyInfo.h"
+#include "llvm/Analysis/LazyBranchProbabilityInfo.h"
+#include "llvm/Pass.h"
+
+namespace llvm {
+class AnalysisUsage;
+class BranchProbabilityInfo;
+class Function;
+class LoopInfo;
+
+/// Wraps a BFI to allow lazy computation of the block frequencies.
+///
+/// A pass that only conditionally uses BFI can uncondtionally require the
+/// analysis without paying for the overhead if BFI doesn't end up being used.
+template <typename FunctionT, typename BranchProbabilityInfoPassT,
+ typename LoopInfoT, typename BlockFrequencyInfoT>
+class LazyBlockFrequencyInfo {
+public:
+ LazyBlockFrequencyInfo()
+ : Calculated(false), F(nullptr), BPIPass(nullptr), LI(nullptr) {}
+
+ /// Set up the per-function input.
+ void setAnalysis(const FunctionT *F, BranchProbabilityInfoPassT *BPIPass,
+ const LoopInfoT *LI) {
+ this->F = F;
+ this->BPIPass = BPIPass;
+ this->LI = LI;
+ }
+
+ /// Retrieve the BFI with the block frequencies computed.
+ BlockFrequencyInfoT &getCalculated() {
+ if (!Calculated) {
+ assert(F && BPIPass && LI && "call setAnalysis");
+ BFI.calculate(
+ *F, BPIPassTrait<BranchProbabilityInfoPassT>::getBPI(BPIPass), *LI);
+ Calculated = true;
+ }
+ return BFI;
+ }
+
+ const BlockFrequencyInfoT &getCalculated() const {
+ return const_cast<LazyBlockFrequencyInfo *>(this)->getCalculated();
+ }
+
+ void releaseMemory() {
+ BFI.releaseMemory();
+ Calculated = false;
+ setAnalysis(nullptr, nullptr, nullptr);
+ }
+
+private:
+ BlockFrequencyInfoT BFI;
+ bool Calculated;
+ const FunctionT *F;
+ BranchProbabilityInfoPassT *BPIPass;
+ const LoopInfoT *LI;
+};
+
+/// \brief This is an alternative analysis pass to
+/// BlockFrequencyInfoWrapperPass. The difference is that with this pass the
+/// block frequencies are not computed when the analysis pass is executed but
+/// rather when the BFI result is explicitly requested by the analysis client.
+///
+/// There are some additional requirements for any client pass that wants to use
+/// the analysis:
+///
+/// 1. The pass needs to initialize dependent passes with:
+///
+/// INITIALIZE_PASS_DEPENDENCY(LazyBFIPass)
+///
+/// 2. Similarly, getAnalysisUsage should call:
+///
+/// LazyBlockFrequencyInfoPass::getLazyBFIAnalysisUsage(AU)
+///
+/// 3. The computed BFI should be requested with
+/// getAnalysis<LazyBlockFrequencyInfoPass>().getBFI() before either LoopInfo
+/// or BPI could be invalidated for example by changing the CFG.
+///
+/// Note that it is expected that we wouldn't need this functionality for the
+/// new PM since with the new PM, analyses are executed on demand.
+
+class LazyBlockFrequencyInfoPass : public FunctionPass {
+private:
+ LazyBlockFrequencyInfo<Function, LazyBranchProbabilityInfoPass, LoopInfo,
+ BlockFrequencyInfo>
+ LBFI;
+
+public:
+ static char ID;
+
+ LazyBlockFrequencyInfoPass();
+
+ /// \brief Compute and return the block frequencies.
+ BlockFrequencyInfo &getBFI() { return LBFI.getCalculated(); }
+
+ /// \brief Compute and return the block frequencies.
+ const BlockFrequencyInfo &getBFI() const { return LBFI.getCalculated(); }
+
+ void getAnalysisUsage(AnalysisUsage &AU) const override;
+
+ /// Helper for client passes to set up the analysis usage on behalf of this
+ /// pass.
+ static void getLazyBFIAnalysisUsage(AnalysisUsage &AU);
+
+ bool runOnFunction(Function &F) override;
+ void releaseMemory() override;
+ void print(raw_ostream &OS, const Module *M) const override;
+};
+
+/// \brief Helper for client passes to initialize dependent passes for LBFI.
+void initializeLazyBFIPassPass(PassRegistry &Registry);
+}
+#endif