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56 lines
1.6 KiB
C++
56 lines
1.6 KiB
C++
//========-------- BlockFrequencyInfo.h - Block Frequency Analysis -------========//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// Loops should be simplified before this analysis.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_ANALYSIS_BLOCKFREQUENCYINFO_H
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#define LLVM_ANALYSIS_BLOCKFREQUENCYINFO_H
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#include "llvm/Pass.h"
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#include "llvm/Support/BlockFrequency.h"
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#include <climits>
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namespace llvm {
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class BranchProbabilityInfo;
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template<class BlockT, class FunctionT, class BranchProbInfoT>
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class BlockFrequencyImpl;
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/// BlockFrequencyInfo pass uses BlockFrequencyImpl implementation to estimate
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/// IR basic block frequencies.
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class BlockFrequencyInfo : public FunctionPass {
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BlockFrequencyImpl<BasicBlock, Function, BranchProbabilityInfo> *BFI;
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public:
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static char ID;
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BlockFrequencyInfo();
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~BlockFrequencyInfo();
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void getAnalysisUsage(AnalysisUsage &AU) const;
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bool runOnFunction(Function &F);
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void print(raw_ostream &O, const Module *M) const;
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/// getblockFreq - Return block frequency. Return 0 if we don't have the
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/// information. Please note that initial frequency is equal to 1024. It means
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/// that we should not rely on the value itself, but only on the comparison to
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/// the other block frequencies. We do this to avoid using of floating points.
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///
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BlockFrequency getBlockFreq(const BasicBlock *BB) const;
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};
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}
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#endif
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