1 //===--------------------- RetireControlUnitStatistics.cpp ------*- C++ -*-===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 /// \file
10 ///
11 /// This file implements the RetireControlUnitStatistics interface.
12 ///
13 //===----------------------------------------------------------------------===//
14
15 #include "Views/RetireControlUnitStatistics.h"
16 #include "llvm/Support/Format.h"
17
18 namespace llvm {
19 namespace mca {
20
RetireControlUnitStatistics(const MCSchedModel & SM)21 RetireControlUnitStatistics::RetireControlUnitStatistics(const MCSchedModel &SM)
22 : NumRetired(0), NumCycles(0), EntriesInUse(0), MaxUsedEntries(0),
23 SumOfUsedEntries(0) {
24 TotalROBEntries = SM.MicroOpBufferSize;
25 if (SM.hasExtraProcessorInfo()) {
26 const MCExtraProcessorInfo &EPI = SM.getExtraProcessorInfo();
27 if (EPI.ReorderBufferSize)
28 TotalROBEntries = EPI.ReorderBufferSize;
29 }
30 }
31
onEvent(const HWInstructionEvent & Event)32 void RetireControlUnitStatistics::onEvent(const HWInstructionEvent &Event) {
33 if (Event.Type == HWInstructionEvent::Dispatched) {
34 unsigned NumEntries =
35 static_cast<const HWInstructionDispatchedEvent &>(Event).MicroOpcodes;
36 EntriesInUse += NumEntries;
37 }
38
39 if (Event.Type == HWInstructionEvent::Retired) {
40 unsigned ReleasedEntries = Event.IR.getInstruction()->getDesc().NumMicroOps;
41 assert(EntriesInUse >= ReleasedEntries && "Invalid internal state!");
42 EntriesInUse -= ReleasedEntries;
43 ++NumRetired;
44 }
45 }
46
onCycleEnd()47 void RetireControlUnitStatistics::onCycleEnd() {
48 // Update histogram
49 RetiredPerCycle[NumRetired]++;
50 NumRetired = 0;
51 ++NumCycles;
52 MaxUsedEntries = std::max(MaxUsedEntries, EntriesInUse);
53 SumOfUsedEntries += EntriesInUse;
54 }
55
printView(raw_ostream & OS) const56 void RetireControlUnitStatistics::printView(raw_ostream &OS) const {
57 std::string Buffer;
58 raw_string_ostream TempStream(Buffer);
59 TempStream << "\n\nRetire Control Unit - "
60 << "number of cycles where we saw N instructions retired:\n";
61 TempStream << "[# retired], [# cycles]\n";
62
63 for (const std::pair<unsigned, unsigned> &Entry : RetiredPerCycle) {
64 TempStream << " " << Entry.first;
65 if (Entry.first < 10)
66 TempStream << ", ";
67 else
68 TempStream << ", ";
69 TempStream << Entry.second << " ("
70 << format("%.1f", ((double)Entry.second / NumCycles) * 100.0)
71 << "%)\n";
72 }
73
74 unsigned AvgUsage = (double)SumOfUsedEntries / NumCycles;
75 double MaxUsagePercentage = ((double)MaxUsedEntries / TotalROBEntries) * 100.0;
76 double NormalizedMaxPercentage = floor((MaxUsagePercentage * 10) + 0.5) / 10;
77 double AvgUsagePercentage = ((double)AvgUsage / TotalROBEntries) * 100.0;
78 double NormalizedAvgPercentage = floor((AvgUsagePercentage * 10) + 0.5) / 10;
79
80 TempStream << "\nTotal ROB Entries: " << TotalROBEntries
81 << "\nMax Used ROB Entries: " << MaxUsedEntries
82 << format(" ( %.1f%% )", NormalizedMaxPercentage)
83 << "\nAverage Used ROB Entries per cy: " << AvgUsage
84 << format(" ( %.1f%% )\n", NormalizedAvgPercentage);
85
86 TempStream.flush();
87 OS << Buffer;
88 }
89
90 } // namespace mca
91 } // namespace llvm
92