07a8255a78
RetireControlUnitStatistics now reports extra information about the ROB and the avg/maximum number of entries consumed over the entire simulation. Example: Retire Control Unit - number of cycles where we saw N instructions retired: [# retired], [# cycles] 0, 109 (17.9%) 1, 102 (16.7%) 2, 399 (65.4%) Total ROB Entries: 64 Max Used ROB Entries: 35 ( 54.7% ) Average Used ROB Entries per cy: 32 ( 50.0% ) Documentation in llvm/docs/CommandGuide/llvmn-mca.rst has been updated to reflect this change. llvm-svn: 347493
92 lines
3.2 KiB
C++
92 lines
3.2 KiB
C++
//===--------------------- RetireControlUnitStatistics.cpp ------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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/// \file
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///
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/// This file implements the RetireControlUnitStatistics interface.
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///
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//===----------------------------------------------------------------------===//
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#include "Views/RetireControlUnitStatistics.h"
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#include "llvm/Support/Format.h"
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namespace llvm {
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namespace mca {
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RetireControlUnitStatistics::RetireControlUnitStatistics(const MCSchedModel &SM)
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: NumRetired(0), NumCycles(0), EntriesInUse(0), MaxUsedEntries(0),
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SumOfUsedEntries(0) {
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TotalROBEntries = SM.MicroOpBufferSize;
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if (SM.hasExtraProcessorInfo()) {
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const MCExtraProcessorInfo &EPI = SM.getExtraProcessorInfo();
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if (EPI.ReorderBufferSize)
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TotalROBEntries = EPI.ReorderBufferSize;
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}
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}
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void RetireControlUnitStatistics::onEvent(const HWInstructionEvent &Event) {
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if (Event.Type == HWInstructionEvent::Dispatched) {
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unsigned NumEntries =
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static_cast<const HWInstructionDispatchedEvent &>(Event).MicroOpcodes;
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EntriesInUse += NumEntries;
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}
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if (Event.Type == HWInstructionEvent::Retired) {
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unsigned ReleasedEntries = Event.IR.getInstruction()->getDesc().NumMicroOps;
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assert(EntriesInUse >= ReleasedEntries && "Invalid internal state!");
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EntriesInUse -= ReleasedEntries;
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++NumRetired;
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}
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}
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void RetireControlUnitStatistics::onCycleEnd() {
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// Update histogram
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RetiredPerCycle[NumRetired]++;
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NumRetired = 0;
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++NumCycles;
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MaxUsedEntries = std::max(MaxUsedEntries, EntriesInUse);
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SumOfUsedEntries += EntriesInUse;
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}
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void RetireControlUnitStatistics::printView(raw_ostream &OS) const {
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std::string Buffer;
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raw_string_ostream TempStream(Buffer);
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TempStream << "\n\nRetire Control Unit - "
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<< "number of cycles where we saw N instructions retired:\n";
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TempStream << "[# retired], [# cycles]\n";
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for (const std::pair<unsigned, unsigned> &Entry : RetiredPerCycle) {
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TempStream << " " << Entry.first;
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if (Entry.first < 10)
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TempStream << ", ";
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else
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TempStream << ", ";
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TempStream << Entry.second << " ("
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<< format("%.1f", ((double)Entry.second / NumCycles) * 100.0)
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<< "%)\n";
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}
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unsigned AvgUsage = (double)SumOfUsedEntries / NumCycles;
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double MaxUsagePercentage = ((double)MaxUsedEntries / TotalROBEntries) * 100.0;
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double NormalizedMaxPercentage = floor((MaxUsagePercentage * 10) + 0.5) / 10;
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double AvgUsagePercentage = ((double)AvgUsage / TotalROBEntries) * 100.0;
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double NormalizedAvgPercentage = floor((AvgUsagePercentage * 10) + 0.5) / 10;
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TempStream << "\nTotal ROB Entries: " << TotalROBEntries
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<< "\nMax Used ROB Entries: " << MaxUsedEntries
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<< format(" ( %.1f%% )", NormalizedMaxPercentage)
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<< "\nAverage Used ROB Entries per cy: " << AvgUsage
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<< format(" ( %.1f%% )\n", NormalizedAvgPercentage);
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TempStream.flush();
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OS << Buffer;
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}
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} // namespace mca
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} // namespace llvm
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