1 //====----- MachineBlockFrequency.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_MACHINEBLOCKFREQUENCY_H 15 #define LLVM_CODEGEN_MACHINEBLOCKFREQUENCY_H 16 17 #include "llvm/CodeGen/MachineFunctionPass.h" 18 #include <climits> 19 20 namespace llvm { 21 22 class MachineBranchProbabilityInfo; 23 template<class BlockT, class FunctionT, class BranchProbInfoT> 24 class BlockFrequencyImpl; 25 26 /// MachineBlockFrequency pass uses BlockFrequencyImpl implementation to estimate 27 /// machine basic block frequencies. 28 class MachineBlockFrequency : public MachineFunctionPass { 29 30 BlockFrequencyImpl<MachineBasicBlock, MachineFunction, MachineBranchProbabilityInfo> *MBFI; 31 32 public: 33 static char ID; 34 35 MachineBlockFrequency(); 36 37 ~MachineBlockFrequency(); 38 39 void getAnalysisUsage(AnalysisUsage &AU) const; 40 41 bool runOnMachineFunction(MachineFunction &F); 42 43 /// getblockFreq - Return block frequency. Never return 0, value must be 44 /// positive. Please note that initial frequency is equal to 1024. It means 45 /// that we should not rely on the value itself, but only on the comparison to 46 /// the other block frequencies. We do this to avoid using of the floating 47 /// points. 48 uint32_t getBlockFreq(MachineBasicBlock *MBB); 49 }; 50 51 } 52 53 #endif 54
