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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@133767 91177308-0d34-0410-b5e6-96231b3b80d8
54 lines
1.5 KiB
C++
54 lines
1.5 KiB
C++
//========-------- BlockFrequency.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_BLOCKFREQUENCY_H
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#define LLVM_ANALYSIS_BLOCKFREQUENCY_H
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#include "llvm/Pass.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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/// BlockFrequency pass uses BlockFrequencyImpl implementation to estimate
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/// IR basic block frequencies.
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class BlockFrequency : 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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BlockFrequency();
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~BlockFrequency();
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void getAnalysisUsage(AnalysisUsage &AU) const;
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bool runOnFunction(Function &F);
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/// getblockFreq - Return block frequency. Never return 0, value must be
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/// positive. 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 the floating
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/// points.
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uint32_t getBlockFreq(BasicBlock *BB);
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};
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}
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#endif
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