2946cd7010
to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
91 lines
3.2 KiB
C++
91 lines
3.2 KiB
C++
//===--------------------- RetireControlUnitStatistics.cpp ------*- C++ -*-===//
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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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/// \file
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///
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/// This file implements the RetireControlUnitStatistics interface.
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///
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//===----------------------------------------------------------------------===//
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#include "Views/RetireControlUnitStatistics.h"
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#include "llvm/Support/Format.h"
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namespace llvm {
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namespace mca {
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RetireControlUnitStatistics::RetireControlUnitStatistics(const MCSchedModel &SM)
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: NumRetired(0), NumCycles(0), EntriesInUse(0), MaxUsedEntries(0),
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SumOfUsedEntries(0) {
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TotalROBEntries = SM.MicroOpBufferSize;
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if (SM.hasExtraProcessorInfo()) {
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const MCExtraProcessorInfo &EPI = SM.getExtraProcessorInfo();
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if (EPI.ReorderBufferSize)
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TotalROBEntries = EPI.ReorderBufferSize;
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}
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}
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void RetireControlUnitStatistics::onEvent(const HWInstructionEvent &Event) {
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if (Event.Type == HWInstructionEvent::Dispatched) {
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unsigned NumEntries =
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static_cast<const HWInstructionDispatchedEvent &>(Event).MicroOpcodes;
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EntriesInUse += NumEntries;
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}
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if (Event.Type == HWInstructionEvent::Retired) {
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unsigned ReleasedEntries = Event.IR.getInstruction()->getDesc().NumMicroOps;
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assert(EntriesInUse >= ReleasedEntries && "Invalid internal state!");
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EntriesInUse -= ReleasedEntries;
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++NumRetired;
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}
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}
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void RetireControlUnitStatistics::onCycleEnd() {
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// Update histogram
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RetiredPerCycle[NumRetired]++;
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NumRetired = 0;
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++NumCycles;
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MaxUsedEntries = std::max(MaxUsedEntries, EntriesInUse);
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SumOfUsedEntries += EntriesInUse;
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}
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void RetireControlUnitStatistics::printView(raw_ostream &OS) const {
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std::string Buffer;
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raw_string_ostream TempStream(Buffer);
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TempStream << "\n\nRetire Control Unit - "
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<< "number of cycles where we saw N instructions retired:\n";
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TempStream << "[# retired], [# cycles]\n";
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for (const std::pair<unsigned, unsigned> &Entry : RetiredPerCycle) {
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TempStream << " " << Entry.first;
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if (Entry.first < 10)
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TempStream << ", ";
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else
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TempStream << ", ";
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TempStream << Entry.second << " ("
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<< format("%.1f", ((double)Entry.second / NumCycles) * 100.0)
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<< "%)\n";
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}
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unsigned AvgUsage = (double)SumOfUsedEntries / NumCycles;
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double MaxUsagePercentage = ((double)MaxUsedEntries / TotalROBEntries) * 100.0;
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double NormalizedMaxPercentage = floor((MaxUsagePercentage * 10) + 0.5) / 10;
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double AvgUsagePercentage = ((double)AvgUsage / TotalROBEntries) * 100.0;
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double NormalizedAvgPercentage = floor((AvgUsagePercentage * 10) + 0.5) / 10;
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TempStream << "\nTotal ROB Entries: " << TotalROBEntries
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<< "\nMax Used ROB Entries: " << MaxUsedEntries
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<< format(" ( %.1f%% )", NormalizedMaxPercentage)
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<< "\nAverage Used ROB Entries per cy: " << AvgUsage
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<< format(" ( %.1f%% )\n", NormalizedAvgPercentage);
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TempStream.flush();
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OS << Buffer;
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}
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} // namespace mca
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} // namespace llvm
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