1 //===--------------------- RetireControlUnitStatistics.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-exception
6 //
7 //===----------------------------------------------------------------------===//
8 /// \file
9 ///
10 /// This file implements the RetireControlUnitStatistics interface.
11 ///
12 //===----------------------------------------------------------------------===//
13
14 #include "Views/RetireControlUnitStatistics.h"
15 #include "llvm/Support/Format.h"
16
17 namespace llvm {
18 namespace mca {
19
RetireControlUnitStatistics(const MCSchedModel & SM)20 RetireControlUnitStatistics::RetireControlUnitStatistics(const MCSchedModel &SM)
21 : NumRetired(0), NumCycles(0), EntriesInUse(0), MaxUsedEntries(0),
22 SumOfUsedEntries(0) {
23 TotalROBEntries = SM.MicroOpBufferSize;
24 if (SM.hasExtraProcessorInfo()) {
25 const MCExtraProcessorInfo &EPI = SM.getExtraProcessorInfo();
26 if (EPI.ReorderBufferSize)
27 TotalROBEntries = EPI.ReorderBufferSize;
28 }
29 }
30
onEvent(const HWInstructionEvent & Event)31 void RetireControlUnitStatistics::onEvent(const HWInstructionEvent &Event) {
32 if (Event.Type == HWInstructionEvent::Dispatched) {
33 unsigned NumEntries =
34 static_cast<const HWInstructionDispatchedEvent &>(Event).MicroOpcodes;
35 EntriesInUse += NumEntries;
36 }
37
38 if (Event.Type == HWInstructionEvent::Retired) {
39 unsigned ReleasedEntries = Event.IR.getInstruction()->getDesc().NumMicroOps;
40 assert(EntriesInUse >= ReleasedEntries && "Invalid internal state!");
41 EntriesInUse -= ReleasedEntries;
42 ++NumRetired;
43 }
44 }
45
onCycleEnd()46 void RetireControlUnitStatistics::onCycleEnd() {
47 // Update histogram
48 RetiredPerCycle[NumRetired]++;
49 NumRetired = 0;
50 ++NumCycles;
51 MaxUsedEntries = std::max(MaxUsedEntries, EntriesInUse);
52 SumOfUsedEntries += EntriesInUse;
53 }
54
printView(raw_ostream & OS) const55 void RetireControlUnitStatistics::printView(raw_ostream &OS) const {
56 std::string Buffer;
57 raw_string_ostream TempStream(Buffer);
58 TempStream << "\n\nRetire Control Unit - "
59 << "number of cycles where we saw N instructions retired:\n";
60 TempStream << "[# retired], [# cycles]\n";
61
62 for (const std::pair<const unsigned, unsigned> &Entry : RetiredPerCycle) {
63 TempStream << " " << Entry.first;
64 if (Entry.first < 10)
65 TempStream << ", ";
66 else
67 TempStream << ", ";
68 TempStream << Entry.second << " ("
69 << format("%.1f", ((double)Entry.second / NumCycles) * 100.0)
70 << "%)\n";
71 }
72
73 unsigned AvgUsage = (double)SumOfUsedEntries / NumCycles;
74 double MaxUsagePercentage =
75 ((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