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MBFIWrapper keeps track of block frequencies of newly created blocks and modified blocks, modified block frequencies should also impact block profile count. This class doesn't provide interface getBlockProfileCount, users can only use the underlying MBFI to query profile count, the underlying MBFI doesn't know the modifications made in MBFIWrapper, so it either provides stale profile count for modified block or simply crashes on new blocks. So this patch add function getBlockProfileCount to class MBFIWrapper to handle new blocks or modified blocks. Differential Revision: https://reviews.llvm.org/D87802
62 lines
2.0 KiB
C++
62 lines
2.0 KiB
C++
//===- MBFIWrapper.cpp - MachineBlockFrequencyInfo wrapper ----------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This class keeps track of branch frequencies of newly created blocks and
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// tail-merged blocks. Used by the TailDuplication and MachineBlockPlacement.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/CodeGen/MBFIWrapper.h"
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#include "llvm/CodeGen/MachineBlockFrequencyInfo.h"
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using namespace llvm;
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BlockFrequency MBFIWrapper::getBlockFreq(const MachineBasicBlock *MBB) const {
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auto I = MergedBBFreq.find(MBB);
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if (I != MergedBBFreq.end())
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return I->second;
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return MBFI.getBlockFreq(MBB);
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}
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void MBFIWrapper::setBlockFreq(const MachineBasicBlock *MBB,
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BlockFrequency F) {
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MergedBBFreq[MBB] = F;
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}
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Optional<uint64_t>
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MBFIWrapper::getBlockProfileCount(const MachineBasicBlock *MBB) const {
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auto I = MergedBBFreq.find(MBB);
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// Modified block frequency also impacts profile count. So we should compute
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// profile count from new block frequency if it has been changed.
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if (I != MergedBBFreq.end())
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return MBFI.getProfileCountFromFreq(I->second.getFrequency());
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return MBFI.getBlockProfileCount(MBB);
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}
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raw_ostream & MBFIWrapper::printBlockFreq(raw_ostream &OS,
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const MachineBasicBlock *MBB) const {
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return MBFI.printBlockFreq(OS, getBlockFreq(MBB));
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}
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raw_ostream & MBFIWrapper::printBlockFreq(raw_ostream &OS,
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const BlockFrequency Freq) const {
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return MBFI.printBlockFreq(OS, Freq);
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}
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void MBFIWrapper::view(const Twine &Name, bool isSimple) {
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MBFI.view(Name, isSimple);
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}
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uint64_t MBFIWrapper::getEntryFreq() const {
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return MBFI.getEntryFreq();
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}
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