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