xref: /openbsd-src/gnu/llvm/llvm/tools/llvm-mca/Views/DispatchStatistics.cpp (revision 73471bf04ceb096474c7f0fa83b1b65c70a787a1)
1*73471bf0Spatrick //===--------------------- DispatchStatistics.cpp ---------------*- C++ -*-===//
209467b48Spatrick //
309467b48Spatrick // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
409467b48Spatrick // See https://llvm.org/LICENSE.txt for license information.
509467b48Spatrick // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
609467b48Spatrick //
709467b48Spatrick //===----------------------------------------------------------------------===//
809467b48Spatrick /// \file
909467b48Spatrick ///
1009467b48Spatrick /// This file implements the DispatchStatistics interface.
1109467b48Spatrick ///
1209467b48Spatrick //===----------------------------------------------------------------------===//
1309467b48Spatrick 
1409467b48Spatrick #include "Views/DispatchStatistics.h"
1509467b48Spatrick #include "llvm/Support/Format.h"
1609467b48Spatrick 
1709467b48Spatrick namespace llvm {
1809467b48Spatrick namespace mca {
1909467b48Spatrick 
onEvent(const HWStallEvent & Event)2009467b48Spatrick void DispatchStatistics::onEvent(const HWStallEvent &Event) {
2109467b48Spatrick   if (Event.Type < HWStallEvent::LastGenericEvent)
2209467b48Spatrick     HWStalls[Event.Type]++;
2309467b48Spatrick }
2409467b48Spatrick 
onEvent(const HWInstructionEvent & Event)2509467b48Spatrick void DispatchStatistics::onEvent(const HWInstructionEvent &Event) {
2609467b48Spatrick   if (Event.Type != HWInstructionEvent::Dispatched)
2709467b48Spatrick     return;
2809467b48Spatrick 
2909467b48Spatrick   const auto &DE = static_cast<const HWInstructionDispatchedEvent &>(Event);
3009467b48Spatrick   NumDispatched += DE.MicroOpcodes;
3109467b48Spatrick }
3209467b48Spatrick 
printDispatchHistogram(raw_ostream & OS) const3309467b48Spatrick void DispatchStatistics::printDispatchHistogram(raw_ostream &OS) const {
3409467b48Spatrick   std::string Buffer;
3509467b48Spatrick   raw_string_ostream TempStream(Buffer);
3609467b48Spatrick   TempStream << "\n\nDispatch Logic - "
3709467b48Spatrick              << "number of cycles where we saw N micro opcodes dispatched:\n";
3809467b48Spatrick   TempStream << "[# dispatched], [# cycles]\n";
3909467b48Spatrick   for (const std::pair<const unsigned, unsigned> &Entry :
4009467b48Spatrick        DispatchGroupSizePerCycle) {
4109467b48Spatrick     double Percentage = ((double)Entry.second / NumCycles) * 100.0;
4209467b48Spatrick     TempStream << " " << Entry.first << ",              " << Entry.second
4309467b48Spatrick                << "  (" << format("%.1f", floor((Percentage * 10) + 0.5) / 10)
4409467b48Spatrick                << "%)\n";
4509467b48Spatrick   }
4609467b48Spatrick 
4709467b48Spatrick   TempStream.flush();
4809467b48Spatrick   OS << Buffer;
4909467b48Spatrick }
5009467b48Spatrick 
printStalls(raw_ostream & OS,unsigned NumStalls,unsigned NumCycles)5109467b48Spatrick static void printStalls(raw_ostream &OS, unsigned NumStalls,
5209467b48Spatrick                         unsigned NumCycles) {
5309467b48Spatrick   if (!NumStalls) {
5409467b48Spatrick     OS << NumStalls;
5509467b48Spatrick     return;
5609467b48Spatrick   }
5709467b48Spatrick 
5809467b48Spatrick   double Percentage = ((double)NumStalls / NumCycles) * 100.0;
5909467b48Spatrick   OS << NumStalls << "  ("
6009467b48Spatrick      << format("%.1f", floor((Percentage * 10) + 0.5) / 10) << "%)";
6109467b48Spatrick }
6209467b48Spatrick 
printDispatchStalls(raw_ostream & OS) const6309467b48Spatrick void DispatchStatistics::printDispatchStalls(raw_ostream &OS) const {
6409467b48Spatrick   std::string Buffer;
6509467b48Spatrick   raw_string_ostream SS(Buffer);
6609467b48Spatrick   SS << "\n\nDynamic Dispatch Stall Cycles:\n";
6709467b48Spatrick   SS << "RAT     - Register unavailable:                      ";
6809467b48Spatrick   printStalls(SS, HWStalls[HWStallEvent::RegisterFileStall], NumCycles);
6909467b48Spatrick   SS << "\nRCU     - Retire tokens unavailable:                 ";
7009467b48Spatrick   printStalls(SS, HWStalls[HWStallEvent::RetireControlUnitStall], NumCycles);
7109467b48Spatrick   SS << "\nSCHEDQ  - Scheduler full:                            ";
7209467b48Spatrick   printStalls(SS, HWStalls[HWStallEvent::SchedulerQueueFull], NumCycles);
7309467b48Spatrick   SS << "\nLQ      - Load queue full:                           ";
7409467b48Spatrick   printStalls(SS, HWStalls[HWStallEvent::LoadQueueFull], NumCycles);
7509467b48Spatrick   SS << "\nSQ      - Store queue full:                          ";
7609467b48Spatrick   printStalls(SS, HWStalls[HWStallEvent::StoreQueueFull], NumCycles);
7709467b48Spatrick   SS << "\nGROUP   - Static restrictions on the dispatch group: ";
7809467b48Spatrick   printStalls(SS, HWStalls[HWStallEvent::DispatchGroupStall], NumCycles);
79*73471bf0Spatrick   SS << "\nUSH     - Uncategorised Structural Hazard:           ";
80*73471bf0Spatrick   printStalls(SS, HWStalls[HWStallEvent::CustomBehaviourStall], NumCycles);
8109467b48Spatrick   SS << '\n';
8209467b48Spatrick   SS.flush();
8309467b48Spatrick   OS << Buffer;
8409467b48Spatrick }
8509467b48Spatrick 
toJSON() const86*73471bf0Spatrick json::Value DispatchStatistics::toJSON() const {
87*73471bf0Spatrick   json::Object JO({{"RAT", HWStalls[HWStallEvent::RegisterFileStall]},
88*73471bf0Spatrick                    {"RCU", HWStalls[HWStallEvent::RetireControlUnitStall]},
89*73471bf0Spatrick                    {"SCHEDQ", HWStalls[HWStallEvent::SchedulerQueueFull]},
90*73471bf0Spatrick                    {"LQ", HWStalls[HWStallEvent::LoadQueueFull]},
91*73471bf0Spatrick                    {"SQ", HWStalls[HWStallEvent::StoreQueueFull]},
92*73471bf0Spatrick                    {"GROUP", HWStalls[HWStallEvent::DispatchGroupStall]},
93*73471bf0Spatrick                    {"USH", HWStalls[HWStallEvent::CustomBehaviourStall]}});
94*73471bf0Spatrick   return JO;
95*73471bf0Spatrick }
96*73471bf0Spatrick 
9709467b48Spatrick } // namespace mca
9809467b48Spatrick } // namespace llvm
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