1 //===--------------------- RetireControlUnitStatistics.cpp ------*- C++ -*-===// 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 /// \file 9 /// 10 /// This file implements the RetireControlUnitStatistics interface. 11 /// 12 //===----------------------------------------------------------------------===// 13 14 #include "Views/RetireControlUnitStatistics.h" 15 #include "llvm/Support/Format.h" 16 17 namespace llvm { 18 namespace mca { 19 20 RetireControlUnitStatistics::RetireControlUnitStatistics(const MCSchedModel &SM) 21 : NumRetired(0), NumCycles(0), EntriesInUse(0), MaxUsedEntries(0), 22 SumOfUsedEntries(0) { 23 TotalROBEntries = SM.MicroOpBufferSize; 24 if (SM.hasExtraProcessorInfo()) { 25 const MCExtraProcessorInfo &EPI = SM.getExtraProcessorInfo(); 26 if (EPI.ReorderBufferSize) 27 TotalROBEntries = EPI.ReorderBufferSize; 28 } 29 } 30 31 void RetireControlUnitStatistics::onEvent(const HWInstructionEvent &Event) { 32 if (Event.Type == HWInstructionEvent::Dispatched) { 33 unsigned NumEntries = 34 static_cast<const HWInstructionDispatchedEvent &>(Event).MicroOpcodes; 35 EntriesInUse += NumEntries; 36 } 37 38 if (Event.Type == HWInstructionEvent::Retired) { 39 unsigned ReleasedEntries = Event.IR.getInstruction()->getDesc().NumMicroOps; 40 assert(EntriesInUse >= ReleasedEntries && "Invalid internal state!"); 41 EntriesInUse -= ReleasedEntries; 42 ++NumRetired; 43 } 44 } 45 46 void RetireControlUnitStatistics::onCycleEnd() { 47 // Update histogram 48 RetiredPerCycle[NumRetired]++; 49 NumRetired = 0; 50 ++NumCycles; 51 MaxUsedEntries = std::max(MaxUsedEntries, EntriesInUse); 52 SumOfUsedEntries += EntriesInUse; 53 } 54 55 void RetireControlUnitStatistics::printView(raw_ostream &OS) const { 56 std::string Buffer; 57 raw_string_ostream TempStream(Buffer); 58 TempStream << "\n\nRetire Control Unit - " 59 << "number of cycles where we saw N instructions retired:\n"; 60 TempStream << "[# retired], [# cycles]\n"; 61 62 for (const std::pair<const unsigned, unsigned> &Entry : RetiredPerCycle) { 63 TempStream << " " << Entry.first; 64 if (Entry.first < 10) 65 TempStream << ", "; 66 else 67 TempStream << ", "; 68 TempStream << Entry.second << " (" 69 << format("%.1f", ((double)Entry.second / NumCycles) * 100.0) 70 << "%)\n"; 71 } 72 73 unsigned AvgUsage = (double)SumOfUsedEntries / NumCycles; 74 double MaxUsagePercentage = 75 ((double)MaxUsedEntries / TotalROBEntries) * 100.0; 76 double NormalizedMaxPercentage = floor((MaxUsagePercentage * 10) + 0.5) / 10; 77 double AvgUsagePercentage = ((double)AvgUsage / TotalROBEntries) * 100.0; 78 double NormalizedAvgPercentage = floor((AvgUsagePercentage * 10) + 0.5) / 10; 79 80 TempStream << "\nTotal ROB Entries: " << TotalROBEntries 81 << "\nMax Used ROB Entries: " << MaxUsedEntries 82 << format(" ( %.1f%% )", NormalizedMaxPercentage) 83 << "\nAverage Used ROB Entries per cy: " << AvgUsage 84 << format(" ( %.1f%% )\n", NormalizedAvgPercentage); 85 86 TempStream.flush(); 87 OS << Buffer; 88 } 89 90 } // namespace mca 91 } // namespace llvm 92