99 lines · cpp
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-exception6//7//===----------------------------------------------------------------------===//8/// \file9///10/// This file implements the DispatchStatistics interface.11///12//===----------------------------------------------------------------------===//13 14#include "Views/DispatchStatistics.h"15#include "llvm/Support/Format.h"16 17namespace llvm {18namespace mca {19 20void DispatchStatistics::onEvent(const HWStallEvent &Event) {21 if (Event.Type < HWStallEvent::LastGenericEvent)22 HWStalls[Event.Type]++;23}24 25void 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 33void 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.second43 << " (" << format("%.1f", floor((Percentage * 10) + 0.5) / 10)44 << "%)\n";45 }46 47 TempStream.flush();48 OS << Buffer;49}50 51static 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 63void 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 86json::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 mca98} // namespace llvm99