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2e26d09106
- Refactor the (Machine)BlockFrequencyInfo::printBlockFreq functions into a `PrintBlockFreq()` function returning a `Printable` object. This simplifies usage as it can be directly piped to a `raw_ostream` like `dbgs() << PrintBlockFreq(MBFI, Freq) << '\n';`. - Previously there was an interesting behavior where `BlockFrequencyInfoImpl` stores frequencies both as a `Scaled64` number and as an `uint64_t`. Most algorithms use the `BlockFrequency` abstraction with the integers, the print function for basic blocks printed the `Scaled64` number potentially showing higher accuracy than was used by the algorithm. This changes things to only print `BlockFrequency` values. - Replace some instances of `dbgs() << Freq.getFrequency()` with the new function.
51 lines
1.6 KiB
C++
51 lines
1.6 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/MachineBlockFrequencyInfo.h"
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#include "llvm/CodeGen/MBFIWrapper.h"
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#include <optional>
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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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std::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);
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return MBFI.getBlockProfileCount(MBB);
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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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BlockFrequency MBFIWrapper::getEntryFreq() const { return MBFI.getEntryFreq(); }
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