1 //===- MBFIWrapper.cpp - MachineBlockFrequencyInfo wrapper ----------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This class keeps track of branch frequencies of newly created blocks and
10 // tail-merged blocks. Used by the TailDuplication and MachineBlockPlacement.
11 //
12 //===----------------------------------------------------------------------===//
13
14 #include "llvm/CodeGen/MachineBlockFrequencyInfo.h"
15 #include "llvm/CodeGen/MBFIWrapper.h"
16 #include <optional>
17
18 using namespace llvm;
19
getBlockFreq(const MachineBasicBlock * MBB) const20 BlockFrequency MBFIWrapper::getBlockFreq(const MachineBasicBlock *MBB) const {
21 auto I = MergedBBFreq.find(MBB);
22
23 if (I != MergedBBFreq.end())
24 return I->second;
25
26 return MBFI.getBlockFreq(MBB);
27 }
28
setBlockFreq(const MachineBasicBlock * MBB,BlockFrequency F)29 void MBFIWrapper::setBlockFreq(const MachineBasicBlock *MBB,
30 BlockFrequency F) {
31 MergedBBFreq[MBB] = F;
32 }
33
34 std::optional<uint64_t>
getBlockProfileCount(const MachineBasicBlock * MBB) const35 MBFIWrapper::getBlockProfileCount(const MachineBasicBlock *MBB) const {
36 auto I = MergedBBFreq.find(MBB);
37
38 // Modified block frequency also impacts profile count. So we should compute
39 // profile count from new block frequency if it has been changed.
40 if (I != MergedBBFreq.end())
41 return MBFI.getProfileCountFromFreq(I->second.getFrequency());
42
43 return MBFI.getBlockProfileCount(MBB);
44 }
45
printBlockFreq(raw_ostream & OS,const MachineBasicBlock * MBB) const46 raw_ostream & MBFIWrapper::printBlockFreq(raw_ostream &OS,
47 const MachineBasicBlock *MBB) const {
48 return MBFI.printBlockFreq(OS, getBlockFreq(MBB));
49 }
50
printBlockFreq(raw_ostream & OS,const BlockFrequency Freq) const51 raw_ostream & MBFIWrapper::printBlockFreq(raw_ostream &OS,
52 const BlockFrequency Freq) const {
53 return MBFI.printBlockFreq(OS, Freq);
54 }
55
view(const Twine & Name,bool isSimple)56 void MBFIWrapper::view(const Twine &Name, bool isSimple) {
57 MBFI.view(Name, isSimple);
58 }
59
getEntryFreq() const60 uint64_t MBFIWrapper::getEntryFreq() const {
61 return MBFI.getEntryFreq();
62 }
63