1 //===--------------------- DispatchStatistics.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 DispatchStatistics interface. 11 /// 12 //===----------------------------------------------------------------------===// 13 14 #include "Views/DispatchStatistics.h" 15 #include "llvm/Support/Format.h" 16 17 namespace llvm { 18 namespace mca { 19 20 void DispatchStatistics::onEvent(const HWStallEvent &Event) { 21 if (Event.Type < HWStallEvent::LastGenericEvent) 22 HWStalls[Event.Type]++; 23 } 24 25 void DispatchStatistics::onEvent(const HWInstructionEvent &Event) { 26 if (Event.Type != HWInstructionEvent::Dispatched) 27 return; 28 29 const auto &DE = static_cast<const HWInstructionDispatchedEvent &>(Event); 30 NumDispatched += DE.MicroOpcodes; 31 } 32 33 void DispatchStatistics::printDispatchHistogram(raw_ostream &OS) const { 34 std::string Buffer; 35 raw_string_ostream TempStream(Buffer); 36 TempStream << "\n\nDispatch Logic - " 37 << "number of cycles where we saw N micro opcodes dispatched:\n"; 38 TempStream << "[# dispatched], [# cycles]\n"; 39 for (const std::pair<const unsigned, unsigned> &Entry : 40 DispatchGroupSizePerCycle) { 41 double Percentage = ((double)Entry.second / NumCycles) * 100.0; 42 TempStream << " " << Entry.first << ", " << Entry.second 43 << " (" << format("%.1f", floor((Percentage * 10) + 0.5) / 10) 44 << "%)\n"; 45 } 46 47 TempStream.flush(); 48 OS << Buffer; 49 } 50 51 static void printStalls(raw_ostream &OS, unsigned NumStalls, 52 unsigned NumCycles) { 53 if (!NumStalls) { 54 OS << NumStalls; 55 return; 56 } 57 58 double Percentage = ((double)NumStalls / NumCycles) * 100.0; 59 OS << NumStalls << " (" 60 << format("%.1f", floor((Percentage * 10) + 0.5) / 10) << "%)"; 61 } 62 63 void DispatchStatistics::printDispatchStalls(raw_ostream &OS) const { 64 std::string Buffer; 65 raw_string_ostream SS(Buffer); 66 SS << "\n\nDynamic Dispatch Stall Cycles:\n"; 67 SS << "RAT - Register unavailable: "; 68 printStalls(SS, HWStalls[HWStallEvent::RegisterFileStall], NumCycles); 69 SS << "\nRCU - Retire tokens unavailable: "; 70 printStalls(SS, HWStalls[HWStallEvent::RetireControlUnitStall], NumCycles); 71 SS << "\nSCHEDQ - Scheduler full: "; 72 printStalls(SS, HWStalls[HWStallEvent::SchedulerQueueFull], NumCycles); 73 SS << "\nLQ - Load queue full: "; 74 printStalls(SS, HWStalls[HWStallEvent::LoadQueueFull], NumCycles); 75 SS << "\nSQ - Store queue full: "; 76 printStalls(SS, HWStalls[HWStallEvent::StoreQueueFull], NumCycles); 77 SS << "\nGROUP - Static restrictions on the dispatch group: "; 78 printStalls(SS, HWStalls[HWStallEvent::DispatchGroupStall], NumCycles); 79 SS << "\nUSH - Uncategorised Structural Hazard: "; 80 printStalls(SS, HWStalls[HWStallEvent::CustomBehaviourStall], NumCycles); 81 SS << '\n'; 82 SS.flush(); 83 OS << Buffer; 84 } 85 86 json::Value DispatchStatistics::toJSON() const { 87 json::Object JO({{"RAT", HWStalls[HWStallEvent::RegisterFileStall]}, 88 {"RCU", HWStalls[HWStallEvent::RetireControlUnitStall]}, 89 {"SCHEDQ", HWStalls[HWStallEvent::SchedulerQueueFull]}, 90 {"LQ", HWStalls[HWStallEvent::LoadQueueFull]}, 91 {"SQ", HWStalls[HWStallEvent::StoreQueueFull]}, 92 {"GROUP", HWStalls[HWStallEvent::DispatchGroupStall]}, 93 {"USH", HWStalls[HWStallEvent::CustomBehaviourStall]}}); 94 return JO; 95 } 96 97 } // namespace mca 98 } // namespace llvm 99