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 MachineBranchProbabilityInfo;
24template<class BlockT, class FunctionT, class BranchProbInfoT>
25class BlockFrequencyImpl;
26
27/// MachineBlockFrequencyInfo pass uses BlockFrequencyImpl implementation to estimate
28/// machine basic block frequencies.
29class MachineBlockFrequencyInfo : public MachineFunctionPass {
30
31  BlockFrequencyImpl<MachineBasicBlock, MachineFunction, MachineBranchProbabilityInfo> *MBFI;
32
33public:
34  static char ID;
35
36  MachineBlockFrequencyInfo();
37
38  ~MachineBlockFrequencyInfo();
39
40  void getAnalysisUsage(AnalysisUsage &AU) const;
41
42  bool runOnMachineFunction(MachineFunction &F);
43
44  /// getblockFreq - Return block frequency. Return 0 if we don't have the
45  /// information. Please note that initial frequency is equal to 1024. It means
46  /// that we should not rely on the value itself, but only on the comparison to
47  /// the other block frequencies. We do this to avoid using of floating points.
48  ///
49  BlockFrequency getBlockFreq(MachineBasicBlock *MBB) const;
50};
51
52}
53
54#endif
55