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14a73679c3
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@135947 91177308-0d34-0410-b5e6-96231b3b80d8
54 lines
1.6 KiB
C++
54 lines
1.6 KiB
C++
//====----- MachineBlockFrequencyInfo.h - MachineBlock 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_CODEGEN_MACHINEBLOCKFREQUENCYINFO_H
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#define LLVM_CODEGEN_MACHINEBLOCKFREQUENCYINFO_H
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#include "llvm/CodeGen/MachineFunctionPass.h"
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#include <climits>
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namespace llvm {
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class MachineBranchProbabilityInfo;
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template<class BlockT, class FunctionT, class BranchProbInfoT>
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class BlockFrequencyImpl;
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/// MachineBlockFrequencyInfo pass uses BlockFrequencyImpl implementation to estimate
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/// machine basic block frequencies.
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class MachineBlockFrequencyInfo : public MachineFunctionPass {
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BlockFrequencyImpl<MachineBasicBlock, MachineFunction, MachineBranchProbabilityInfo> *MBFI;
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public:
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static char ID;
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MachineBlockFrequencyInfo();
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~MachineBlockFrequencyInfo();
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void getAnalysisUsage(AnalysisUsage &AU) const;
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bool runOnMachineFunction(MachineFunction &F);
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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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uint32_t getBlockFreq(MachineBasicBlock *MBB);
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};
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}
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#endif
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