llvm/lib/CodeGen/MBFIWrapper.cpp

   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
  20 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
  29 void MBFIWrapper::setBlockFreq(const MachineBasicBlock *MBB,
  30                                BlockFrequency F) {
  31   MergedBBFreq[MBB] = F;
  32 }
  33
  34 std::optional<uint64_t>
  35 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);
  42
  43   return MBFI.getBlockProfileCount(MBB);
  44 }
  45
  46 void MBFIWrapper::view(const Twine &Name, bool isSimple) {
  47   MBFI.view(Name, isSimple);
  48 }
  49
  50 BlockFrequency MBFIWrapper::getEntryFreq() const { return MBFI.getEntryFreq(); }