1 //===--------------------- RetireControlUnitStatistics.cpp ------*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 /// \file 10 /// 11 /// This file implements the RetireControlUnitStatistics interface. 12 /// 13 //===----------------------------------------------------------------------===// 14 15 #include "Views/RetireControlUnitStatistics.h" 16 #include "llvm/Support/Format.h" 17 18 namespace llvm { 19 namespace mca { 20 21 RetireControlUnitStatistics::RetireControlUnitStatistics(const MCSchedModel &SM) 22 : NumRetired(0), NumCycles(0), EntriesInUse(0), MaxUsedEntries(0), 23 SumOfUsedEntries(0) { 24 TotalROBEntries = SM.MicroOpBufferSize; 25 if (SM.hasExtraProcessorInfo()) { 26 const MCExtraProcessorInfo &EPI = SM.getExtraProcessorInfo(); 27 if (EPI.ReorderBufferSize) 28 TotalROBEntries = EPI.ReorderBufferSize; 29 } 30 } 31 32 void RetireControlUnitStatistics::onEvent(const HWInstructionEvent &Event) { 33 if (Event.Type == HWInstructionEvent::Dispatched) { 34 unsigned NumEntries = 35 static_cast<const HWInstructionDispatchedEvent &>(Event).MicroOpcodes; 36 EntriesInUse += NumEntries; 37 } 38 39 if (Event.Type == HWInstructionEvent::Retired) { 40 unsigned ReleasedEntries = Event.IR.getInstruction()->getDesc().NumMicroOps; 41 assert(EntriesInUse >= ReleasedEntries && "Invalid internal state!"); 42 EntriesInUse -= ReleasedEntries; 43 ++NumRetired; 44 } 45 } 46 47 void RetireControlUnitStatistics::onCycleEnd() { 48 // Update histogram 49 RetiredPerCycle[NumRetired]++; 50 NumRetired = 0; 51 ++NumCycles; 52 MaxUsedEntries = std::max(MaxUsedEntries, EntriesInUse); 53 SumOfUsedEntries += EntriesInUse; 54 } 55 56 void RetireControlUnitStatistics::printView(raw_ostream &OS) const { 57 std::string Buffer; 58 raw_string_ostream TempStream(Buffer); 59 TempStream << "\n\nRetire Control Unit - " 60 << "number of cycles where we saw N instructions retired:\n"; 61 TempStream << "[# retired], [# cycles]\n"; 62 63 for (const std::pair<unsigned, unsigned> &Entry : RetiredPerCycle) { 64 TempStream << " " << Entry.first; 65 if (Entry.first < 10) 66 TempStream << ", "; 67 else 68 TempStream << ", "; 69 TempStream << Entry.second << " (" 70 << format("%.1f", ((double)Entry.second / NumCycles) * 100.0) 71 << "%)\n"; 72 } 73 74 unsigned AvgUsage = (double)SumOfUsedEntries / NumCycles; 75 double MaxUsagePercentage = ((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