1//====----- MachineBlockFrequencyInfo.h - MachineBlock Frequency Analysis ----====// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// Loops should be simplified before this analysis. 11// 12//===----------------------------------------------------------------------===// 13 14#ifndef LLVM_CODEGEN_MACHINEBLOCKFREQUENCYINFO_H 15#define LLVM_CODEGEN_MACHINEBLOCKFREQUENCYINFO_H 16 17#include "llvm/CodeGen/MachineFunctionPass.h" 18#include "llvm/Support/BlockFrequency.h" 19#include <climits> 20 21namespace llvm { 22 23class MachineBasicBlock; 24class MachineBranchProbabilityInfo; 25template<class BlockT, class FunctionT, class BranchProbInfoT> 26class BlockFrequencyImpl; 27 28/// MachineBlockFrequencyInfo pass uses BlockFrequencyImpl implementation to estimate 29/// machine basic block frequencies. 30class MachineBlockFrequencyInfo : public MachineFunctionPass { 31 32 BlockFrequencyImpl<MachineBasicBlock, MachineFunction, 33 MachineBranchProbabilityInfo> *MBFI; 34 35public: 36 static char ID; 37 38 MachineBlockFrequencyInfo(); 39 40 ~MachineBlockFrequencyInfo(); 41 42 void getAnalysisUsage(AnalysisUsage &AU) const; 43 44 bool runOnMachineFunction(MachineFunction &F); 45 46 /// getblockFreq - Return block frequency. Return 0 if we don't have the 47 /// information. Please note that initial frequency is equal to 1024. It means 48 /// that we should not rely on the value itself, but only on the comparison to 49 /// the other block frequencies. We do this to avoid using of floating points. 50 /// 51 BlockFrequency getBlockFreq(const MachineBasicBlock *MBB) const; 52}; 53 54} 55 56#endif 57