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//===--------------------- RetireControlUnitStatistics.cpp ------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
/// \file
///
/// This file implements the RetireControlUnitStatistics interface.
///
//===----------------------------------------------------------------------===//
#include "Views/RetireControlUnitStatistics.h"
#include "llvm/Support/Format.h"
namespace llvm {
namespace mca {
RetireControlUnitStatistics::RetireControlUnitStatistics(const MCSchedModel &SM)
: NumRetired(0), NumCycles(0), EntriesInUse(0), MaxUsedEntries(0),
SumOfUsedEntries(0) {
TotalROBEntries = SM.MicroOpBufferSize;
if (SM.hasExtraProcessorInfo()) {
const MCExtraProcessorInfo &EPI = SM.getExtraProcessorInfo();
if (EPI.ReorderBufferSize)
TotalROBEntries = EPI.ReorderBufferSize;
}
}
void RetireControlUnitStatistics::onEvent(const HWInstructionEvent &Event) {
if (Event.Type == HWInstructionEvent::Dispatched) {
unsigned NumEntries =
static_cast<const HWInstructionDispatchedEvent &>(Event).MicroOpcodes;
EntriesInUse += NumEntries;
}
if (Event.Type == HWInstructionEvent::Retired) {
unsigned ReleasedEntries = Event.IR.getInstruction()->getDesc().NumMicroOps;
assert(EntriesInUse >= ReleasedEntries && "Invalid internal state!");
EntriesInUse -= ReleasedEntries;
++NumRetired;
}
}
void RetireControlUnitStatistics::onCycleEnd() {
// Update histogram
RetiredPerCycle[NumRetired]++;
NumRetired = 0;
++NumCycles;
MaxUsedEntries = std::max(MaxUsedEntries, EntriesInUse);
SumOfUsedEntries += EntriesInUse;
}
void RetireControlUnitStatistics::printView(raw_ostream &OS) const {
std::string Buffer;
raw_string_ostream TempStream(Buffer);
TempStream << "\n\nRetire Control Unit - "
<< "number of cycles where we saw N instructions retired:\n";
TempStream << "[# retired], [# cycles]\n";
for (const std::pair<const unsigned, unsigned> &Entry : RetiredPerCycle) {
TempStream << " " << Entry.first;
if (Entry.first < 10)
TempStream << ", ";
else
TempStream << ", ";
TempStream << Entry.second << " ("
<< format("%.1f", ((double)Entry.second / NumCycles) * 100.0)
<< "%)\n";
}
unsigned AvgUsage = (double)SumOfUsedEntries / NumCycles;
double MaxUsagePercentage =
((double)MaxUsedEntries / TotalROBEntries) * 100.0;
double NormalizedMaxPercentage = floor((MaxUsagePercentage * 10) + 0.5) / 10;
double AvgUsagePercentage = ((double)AvgUsage / TotalROBEntries) * 100.0;
double NormalizedAvgPercentage = floor((AvgUsagePercentage * 10) + 0.5) / 10;
TempStream << "\nTotal ROB Entries: " << TotalROBEntries
<< "\nMax Used ROB Entries: " << MaxUsedEntries
<< format(" ( %.1f%% )", NormalizedMaxPercentage)
<< "\nAverage Used ROB Entries per cy: " << AvgUsage
<< format(" ( %.1f%% )\n", NormalizedAvgPercentage);
TempStream.flush();
OS << Buffer;
}
} // namespace mca
} // namespace llvm
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