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//===--------------------- BackendStatistics.cpp ---------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
/// \file
///
/// Functionalities used by the BackendPrinter to print out histograms
/// related to number of {dispatch/issue/retire} per number of cycles.
///
//===----------------------------------------------------------------------===//
#include "BackendStatistics.h"
#include "llvm/Support/Format.h"
using namespace llvm;
namespace mca {
void BackendStatistics::onInstructionEvent(const HWInstructionEvent &Event) {
switch (Event.Type) {
case HWInstructionEvent::Retired:
++NumRetired;
break;
case HWInstructionEvent::Issued:
++NumIssued;
break;
case HWInstructionEvent::Dispatched:
++NumDispatched;
break;
default:
break;
}
}
void BackendStatistics::printRetireUnitStatistics(llvm::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<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";
}
TempStream.flush();
OS << Buffer;
}
void BackendStatistics::printDispatchUnitStatistics(
llvm::raw_ostream &OS) const {
std::string Buffer;
raw_string_ostream TempStream(Buffer);
TempStream << "\n\nDispatch Logic - "
<< "number of cycles where we saw N instructions dispatched:\n";
TempStream << "[# dispatched], [# cycles]\n";
for (const std::pair<unsigned, unsigned> &Entry : DispatchGroupSizePerCycle) {
TempStream << " " << Entry.first << ", " << Entry.second
<< " ("
<< format("%.1f", ((double)Entry.second / NumCycles) * 100.0)
<< "%)\n";
}
TempStream.flush();
OS << Buffer;
}
void BackendStatistics::printSchedulerStatistics(llvm::raw_ostream &OS) const {
std::string Buffer;
raw_string_ostream TempStream(Buffer);
TempStream << "\n\nSchedulers - number of cycles where we saw N instructions "
"issued:\n";
TempStream << "[# issued], [# cycles]\n";
for (const std::pair<unsigned, unsigned> &Entry : IssuedPerCycle) {
TempStream << " " << Entry.first << ", " << Entry.second << " ("
<< format("%.1f", ((double)Entry.second / NumCycles) * 100)
<< "%)\n";
}
TempStream.flush();
OS << Buffer;
}
void BackendStatistics::printRATStatistics(raw_ostream &OS,
unsigned TotalMappings,
unsigned MaxUsedMappings) const {
std::string Buffer;
raw_string_ostream TempStream(Buffer);
TempStream << "\n\nRegister Alias Table:";
TempStream << "\nTotal number of mappings created: " << TotalMappings;
TempStream << "\nMax number of mappings used: " << MaxUsedMappings
<< '\n';
TempStream.flush();
OS << Buffer;
}
void BackendStatistics::printDispatchStalls(raw_ostream &OS, unsigned RATStalls,
unsigned RCUStalls,
unsigned SCHEDQStalls,
unsigned LDQStalls,
unsigned STQStalls,
unsigned DGStalls) const {
std::string Buffer;
raw_string_ostream TempStream(Buffer);
TempStream << "\n\nDynamic Dispatch Stall Cycles:\n";
TempStream << "RAT - Register unavailable: "
<< RATStalls;
TempStream << "\nRCU - Retire tokens unavailable: "
<< RCUStalls;
TempStream << "\nSCHEDQ - Scheduler full: "
<< SCHEDQStalls;
TempStream << "\nLQ - Load queue full: "
<< LDQStalls;
TempStream << "\nSQ - Store queue full: "
<< STQStalls;
TempStream << "\nGROUP - Static restrictions on the dispatch group: "
<< DGStalls;
TempStream << '\n';
TempStream.flush();
OS << Buffer;
}
void BackendStatistics::printSchedulerUsage(
raw_ostream &OS, const MCSchedModel &SM,
const ArrayRef<BufferUsageEntry> &Usage) const {
std::string Buffer;
raw_string_ostream TempStream(Buffer);
TempStream << "\n\nScheduler's queue usage:\n";
// Early exit if no buffered resources were consumed.
if (Usage.empty()) {
TempStream << "No scheduler resources used.\n";
TempStream.flush();
OS << Buffer;
return;
}
for (unsigned I = 0, E = SM.getNumProcResourceKinds(); I < E; ++I) {
const MCProcResourceDesc &ProcResource = *SM.getProcResource(I);
if (!ProcResource.BufferSize)
continue;
for (const BufferUsageEntry &Entry : Usage)
if (I == Entry.first)
TempStream << ProcResource.Name << ", " << Entry.second << '/'
<< ProcResource.BufferSize << '\n';
}
TempStream.flush();
OS << Buffer;
}
} // namespace mca
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