1 //===--------------------- DispatchStatistics.cpp ---------------------*- C++
2 //-*-===//
3 //
4 //                     The LLVM Compiler Infrastructure
5 //
6 // This file is distributed under the University of Illinois Open Source
7 // License. See LICENSE.TXT for details.
8 //
9 //===----------------------------------------------------------------------===//
10 /// \file
11 ///
12 /// This file implements the DispatchStatistics interface.
13 ///
14 //===----------------------------------------------------------------------===//
15 
16 #include "Views/DispatchStatistics.h"
17 #include "llvm/Support/Format.h"
18 
19 namespace llvm {
20 namespace mca {
21 
22 void DispatchStatistics::onEvent(const HWStallEvent &Event) {
23   if (Event.Type < HWStallEvent::LastGenericEvent)
24     HWStalls[Event.Type]++;
25 }
26 
27 void DispatchStatistics::onEvent(const HWInstructionEvent &Event) {
28   if (Event.Type != HWInstructionEvent::Dispatched)
29     return;
30 
31   const auto &DE = static_cast<const HWInstructionDispatchedEvent &>(Event);
32   NumDispatched += DE.MicroOpcodes;
33 }
34 
35 void DispatchStatistics::printDispatchHistogram(raw_ostream &OS) const {
36   std::string Buffer;
37   raw_string_ostream TempStream(Buffer);
38   TempStream << "\n\nDispatch Logic - "
39              << "number of cycles where we saw N micro opcodes dispatched:\n";
40   TempStream << "[# dispatched], [# cycles]\n";
41   for (const std::pair<unsigned, unsigned> &Entry : DispatchGroupSizePerCycle) {
42     double Percentage = ((double)Entry.second / NumCycles) * 100.0;
43     TempStream << " " << Entry.first << ",              " << Entry.second
44                << "  (" << format("%.1f", floor((Percentage * 10) + 0.5) / 10)
45                << "%)\n";
46   }
47 
48   TempStream.flush();
49   OS << Buffer;
50 }
51 
52 static void printStalls(raw_ostream &OS, unsigned NumStalls,
53                         unsigned NumCycles) {
54   if (!NumStalls) {
55     OS << NumStalls;
56     return;
57   }
58 
59   double Percentage = ((double)NumStalls / NumCycles) * 100.0;
60   OS << NumStalls << "  ("
61      << format("%.1f", floor((Percentage * 10) + 0.5) / 10) << "%)";
62 }
63 
64 void DispatchStatistics::printDispatchStalls(raw_ostream &OS) const {
65   std::string Buffer;
66   raw_string_ostream SS(Buffer);
67   SS << "\n\nDynamic Dispatch Stall Cycles:\n";
68   SS << "RAT     - Register unavailable:                      ";
69   printStalls(SS, HWStalls[HWStallEvent::RegisterFileStall], NumCycles);
70   SS << "\nRCU     - Retire tokens unavailable:                 ";
71   printStalls(SS, HWStalls[HWStallEvent::RetireControlUnitStall], NumCycles);
72   SS << "\nSCHEDQ  - Scheduler full:                            ";
73   printStalls(SS, HWStalls[HWStallEvent::SchedulerQueueFull], NumCycles);
74   SS << "\nLQ      - Load queue full:                           ";
75   printStalls(SS, HWStalls[HWStallEvent::LoadQueueFull], NumCycles);
76   SS << "\nSQ      - Store queue full:                          ";
77   printStalls(SS, HWStalls[HWStallEvent::StoreQueueFull], NumCycles);
78   SS << "\nGROUP   - Static restrictions on the dispatch group: ";
79   printStalls(SS, HWStalls[HWStallEvent::DispatchGroupStall], NumCycles);
80   SS << '\n';
81   SS.flush();
82   OS << Buffer;
83 }
84 
85 } // namespace mca
86 } // namespace llvm
87