| //===--------------------- RetireControlUnitStatistics.cpp ------*- C++ -*-===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| /// \file |
| /// |
| /// This file implements the RetireControlUnitStatistics interface. |
| /// |
| //===----------------------------------------------------------------------===// |
| |
| #include "Views/RetireControlUnitStatistics.h" |
| #include "llvm/Support/Format.h" |
| |
| namespace llvm { |
| namespace mca { |
| |
| RetireControlUnitStatistics::RetireControlUnitStatistics(const MCSchedModel &SM) |
| : NumRetired(0), NumCycles(0), EntriesInUse(0), MaxUsedEntries(0), |
| SumOfUsedEntries(0) { |
| TotalROBEntries = SM.MicroOpBufferSize; |
| if (SM.hasExtraProcessorInfo()) { |
| const MCExtraProcessorInfo &EPI = SM.getExtraProcessorInfo(); |
| if (EPI.ReorderBufferSize) |
| TotalROBEntries = EPI.ReorderBufferSize; |
| } |
| } |
| |
| void RetireControlUnitStatistics::onEvent(const HWInstructionEvent &Event) { |
| if (Event.Type == HWInstructionEvent::Dispatched) { |
| unsigned NumEntries = |
| static_cast<const HWInstructionDispatchedEvent &>(Event).MicroOpcodes; |
| EntriesInUse += NumEntries; |
| } |
| |
| if (Event.Type == HWInstructionEvent::Retired) { |
| unsigned ReleasedEntries = Event.IR.getInstruction()->getDesc().NumMicroOps; |
| assert(EntriesInUse >= ReleasedEntries && "Invalid internal state!"); |
| EntriesInUse -= ReleasedEntries; |
| ++NumRetired; |
| } |
| } |
| |
| void RetireControlUnitStatistics::onCycleEnd() { |
| // Update histogram |
| RetiredPerCycle[NumRetired]++; |
| NumRetired = 0; |
| ++NumCycles; |
| MaxUsedEntries = std::max(MaxUsedEntries, EntriesInUse); |
| SumOfUsedEntries += EntriesInUse; |
| } |
| |
| void RetireControlUnitStatistics::printView(raw_ostream &OS) const { |
| std::string Buffer; |
| raw_string_ostream TempStream(Buffer); |
| TempStream << "\n\nRetire Control Unit - " |
| << "number of cycles where we saw N instructions retired:\n"; |
| TempStream << "[# retired], [# cycles]\n"; |
| |
| for (const std::pair<unsigned, unsigned> &Entry : RetiredPerCycle) { |
| TempStream << " " << Entry.first; |
| if (Entry.first < 10) |
| TempStream << ", "; |
| else |
| TempStream << ", "; |
| TempStream << Entry.second << " (" |
| << format("%.1f", ((double)Entry.second / NumCycles) * 100.0) |
| << "%)\n"; |
| } |
| |
| unsigned AvgUsage = (double)SumOfUsedEntries / NumCycles; |
| double MaxUsagePercentage = ((double)MaxUsedEntries / TotalROBEntries) * 100.0; |
| double NormalizedMaxPercentage = floor((MaxUsagePercentage * 10) + 0.5) / 10; |
| double AvgUsagePercentage = ((double)AvgUsage / TotalROBEntries) * 100.0; |
| double NormalizedAvgPercentage = floor((AvgUsagePercentage * 10) + 0.5) / 10; |
| |
| TempStream << "\nTotal ROB Entries: " << TotalROBEntries |
| << "\nMax Used ROB Entries: " << MaxUsedEntries |
| << format(" ( %.1f%% )", NormalizedMaxPercentage) |
| << "\nAverage Used ROB Entries per cy: " << AvgUsage |
| << format(" ( %.1f%% )\n", NormalizedAvgPercentage); |
| |
| TempStream.flush(); |
| OS << Buffer; |
| } |
| |
| } // namespace mca |
| } // namespace llvm |