| //===--------------------- DispatchStatistics.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 DispatchStatistics interface. |
| /// |
| //===----------------------------------------------------------------------===// |
| |
| #include "Views/DispatchStatistics.h" |
| #include "llvm/Support/Format.h" |
| |
| namespace llvm { |
| namespace mca { |
| |
| void DispatchStatistics::onEvent(const HWStallEvent &Event) { |
| if (Event.Type < HWStallEvent::LastGenericEvent) |
| HWStalls[Event.Type]++; |
| } |
| |
| void DispatchStatistics::onEvent(const HWInstructionEvent &Event) { |
| if (Event.Type != HWInstructionEvent::Dispatched) |
| return; |
| |
| const auto &DE = static_cast<const HWInstructionDispatchedEvent &>(Event); |
| NumDispatched += DE.MicroOpcodes; |
| } |
| |
| void DispatchStatistics::printDispatchHistogram(raw_ostream &OS) const { |
| std::string Buffer; |
| raw_string_ostream TempStream(Buffer); |
| TempStream << "\n\nDispatch Logic - " |
| << "number of cycles where we saw N micro opcodes dispatched:\n"; |
| TempStream << "[# dispatched], [# cycles]\n"; |
| for (const std::pair<const unsigned, unsigned> &Entry : |
| DispatchGroupSizePerCycle) { |
| double Percentage = ((double)Entry.second / NumCycles) * 100.0; |
| TempStream << " " << Entry.first << ", " << Entry.second |
| << " (" << format("%.1f", floor((Percentage * 10) + 0.5) / 10) |
| << "%)\n"; |
| } |
| |
| TempStream.flush(); |
| OS << Buffer; |
| } |
| |
| static void printStalls(raw_ostream &OS, unsigned NumStalls, |
| unsigned NumCycles) { |
| if (!NumStalls) { |
| OS << NumStalls; |
| return; |
| } |
| |
| double Percentage = ((double)NumStalls / NumCycles) * 100.0; |
| OS << NumStalls << " (" |
| << format("%.1f", floor((Percentage * 10) + 0.5) / 10) << "%)"; |
| } |
| |
| void DispatchStatistics::printDispatchStalls(raw_ostream &OS) const { |
| std::string Buffer; |
| raw_string_ostream SS(Buffer); |
| SS << "\n\nDynamic Dispatch Stall Cycles:\n"; |
| SS << "RAT - Register unavailable: "; |
| printStalls(SS, HWStalls[HWStallEvent::RegisterFileStall], NumCycles); |
| SS << "\nRCU - Retire tokens unavailable: "; |
| printStalls(SS, HWStalls[HWStallEvent::RetireControlUnitStall], NumCycles); |
| SS << "\nSCHEDQ - Scheduler full: "; |
| printStalls(SS, HWStalls[HWStallEvent::SchedulerQueueFull], NumCycles); |
| SS << "\nLQ - Load queue full: "; |
| printStalls(SS, HWStalls[HWStallEvent::LoadQueueFull], NumCycles); |
| SS << "\nSQ - Store queue full: "; |
| printStalls(SS, HWStalls[HWStallEvent::StoreQueueFull], NumCycles); |
| SS << "\nGROUP - Static restrictions on the dispatch group: "; |
| printStalls(SS, HWStalls[HWStallEvent::DispatchGroupStall], NumCycles); |
| SS << "\nUSH - Uncategorised Structural Hazard: "; |
| printStalls(SS, HWStalls[HWStallEvent::CustomBehaviourStall], NumCycles); |
| SS << '\n'; |
| SS.flush(); |
| OS << Buffer; |
| } |
| |
| json::Value DispatchStatistics::toJSON() const { |
| json::Object JO({{"RAT", HWStalls[HWStallEvent::RegisterFileStall]}, |
| {"RCU", HWStalls[HWStallEvent::RetireControlUnitStall]}, |
| {"SCHEDQ", HWStalls[HWStallEvent::SchedulerQueueFull]}, |
| {"LQ", HWStalls[HWStallEvent::LoadQueueFull]}, |
| {"SQ", HWStalls[HWStallEvent::StoreQueueFull]}, |
| {"GROUP", HWStalls[HWStallEvent::DispatchGroupStall]}, |
| {"USH", HWStalls[HWStallEvent::CustomBehaviourStall]}}); |
| return JO; |
| } |
| |
| } // namespace mca |
| } // namespace llvm |