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//===--------------------- ResourcePressureView.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 methods in the ResourcePressureView interface.
///
//===----------------------------------------------------------------------===//
#include "Views/ResourcePressureView.h"
#include "llvm/Support/FormattedStream.h"
#include "llvm/Support/raw_ostream.h"
namespace llvm {
namespace mca {
ResourcePressureView::ResourcePressureView(const llvm::MCSubtargetInfo &sti,
MCInstPrinter &Printer,
ArrayRef<MCInst> S)
: InstructionView(sti, Printer, S), LastInstructionIdx(0) {
// Populate the map of resource descriptors.
unsigned R2VIndex = 0;
const MCSchedModel &SM = getSubTargetInfo().getSchedModel();
for (unsigned I = 0, E = SM.getNumProcResourceKinds(); I < E; ++I) {
const MCProcResourceDesc &ProcResource = *SM.getProcResource(I);
unsigned NumUnits = ProcResource.NumUnits;
// Skip groups and invalid resources with zero units.
if (ProcResource.SubUnitsIdxBegin || !NumUnits)
continue;
Resource2VecIndex.insert(std::pair<unsigned, unsigned>(I, R2VIndex));
R2VIndex += ProcResource.NumUnits;
}
NumResourceUnits = R2VIndex;
ResourceUsage.resize(getSource().size());
ResourceReleaseAtCycles InitValue{0, 0};
auto Generator = [&InitValue]() {
ResourceReleaseAtCycles Old = InitValue;
++InitValue.ResourceIdx;
return Old;
};
std::generate_n(std::back_inserter(CommonResourceUsage), NumResourceUnits,
Generator);
}
void ResourcePressureView::onEvent(const HWInstructionEvent &Event) {
if (Event.Type == HWInstructionEvent::Dispatched) {
LastInstructionIdx = Event.IR.getSourceIndex();
return;
}
// We're only interested in Issue events.
if (Event.Type != HWInstructionEvent::Issued)
return;
const auto &IssueEvent = static_cast<const HWInstructionIssuedEvent &>(Event);
ArrayRef<llvm::MCInst> Source = getSource();
const unsigned SourceIdx = Event.IR.getSourceIndex() % Source.size();
for (const std::pair<ResourceRef, ReleaseAtCycles> &Use :
IssueEvent.UsedResources) {
const ResourceRef &RR = Use.first;
assert(Resource2VecIndex.contains(RR.first));
unsigned R2VIndex = Resource2VecIndex[RR.first];
R2VIndex += llvm::countr_zero(RR.second);
InstResourceUsage &RU = ResourceUsage[SourceIdx];
ResourceReleaseAtCycles NewUsage{R2VIndex, Use.second};
auto ResCyclesIt =
lower_bound(RU, NewUsage, [](const auto &L, const auto &R) {
return L.ResourceIdx < R.ResourceIdx;
});
if (ResCyclesIt != RU.end() && ResCyclesIt->ResourceIdx == R2VIndex)
ResCyclesIt->Cycles += NewUsage.Cycles;
else
RU.insert(ResCyclesIt, std::move(NewUsage));
CommonResourceUsage[R2VIndex].Cycles += NewUsage.Cycles;
}
}
static void printColumnNames(formatted_raw_ostream &OS,
const MCSchedModel &SM) {
unsigned Column = OS.getColumn();
for (unsigned I = 1, ResourceIndex = 0, E = SM.getNumProcResourceKinds();
I < E; ++I) {
const MCProcResourceDesc &ProcResource = *SM.getProcResource(I);
unsigned NumUnits = ProcResource.NumUnits;
// Skip groups and invalid resources with zero units.
if (ProcResource.SubUnitsIdxBegin || !NumUnits)
continue;
for (unsigned J = 0; J < NumUnits; ++J) {
Column += 7;
OS << "[" << ResourceIndex;
if (NumUnits > 1)
OS << '.' << J;
OS << ']';
OS.PadToColumn(Column);
}
ResourceIndex++;
}
}
static void printResourcePressure(formatted_raw_ostream &OS, double Pressure,
unsigned Col) {
if (!Pressure || Pressure < 0.005) {
OS << " - ";
} else {
// Round to the value to the nearest hundredth and then print it.
OS << format("%.2f", floor((Pressure * 100) + 0.5) / 100);
}
OS.PadToColumn(Col);
}
void ResourcePressureView::printResourcePressurePerIter(raw_ostream &OS) const {
std::string Buffer;
raw_string_ostream TempStream(Buffer);
formatted_raw_ostream FOS(TempStream);
FOS << "\n\nResources:\n";
const MCSchedModel &SM = getSubTargetInfo().getSchedModel();
for (unsigned I = 1, ResourceIndex = 0, E = SM.getNumProcResourceKinds();
I < E; ++I) {
const MCProcResourceDesc &ProcResource = *SM.getProcResource(I);
unsigned NumUnits = ProcResource.NumUnits;
// Skip groups and invalid resources with zero units.
if (ProcResource.SubUnitsIdxBegin || !NumUnits)
continue;
for (unsigned J = 0; J < NumUnits; ++J) {
FOS << '[' << ResourceIndex;
if (NumUnits > 1)
FOS << '.' << J;
FOS << ']';
FOS.PadToColumn(6);
FOS << "- " << ProcResource.Name << '\n';
}
ResourceIndex++;
}
FOS << "\n\nResource pressure per iteration:\n";
FOS.flush();
printColumnNames(FOS, SM);
FOS << '\n';
FOS.flush();
ArrayRef<llvm::MCInst> Source = getSource();
const unsigned Executions = LastInstructionIdx / Source.size() + 1;
auto UsageEntryEnd = CommonResourceUsage.end();
auto UsageEntryIt = CommonResourceUsage.begin();
for (unsigned I = 0, E = NumResourceUnits; I < E; ++I) {
double Pressure = 0.0;
if (UsageEntryIt != UsageEntryEnd && UsageEntryIt->ResourceIdx == I) {
Pressure = UsageEntryIt->Cycles / Executions;
++UsageEntryIt;
}
printResourcePressure(FOS, Pressure, (I + 1) * 7);
}
assert(UsageEntryIt == UsageEntryEnd);
FOS.flush();
OS << Buffer;
}
void ResourcePressureView::printResourcePressurePerInst(raw_ostream &OS) const {
std::string Buffer;
raw_string_ostream TempStream(Buffer);
formatted_raw_ostream FOS(TempStream);
FOS << "\n\nResource pressure by instruction:\n";
printColumnNames(FOS, getSubTargetInfo().getSchedModel());
FOS << "Instructions:\n";
unsigned InstrIndex = 0;
ArrayRef<llvm::MCInst> Source = getSource();
const unsigned Executions = LastInstructionIdx / Source.size() + 1;
for (const MCInst &MCI : Source) {
auto UsageEntryEnd = ResourceUsage[InstrIndex].end();
auto UsageEntryIt = ResourceUsage[InstrIndex].begin();
for (unsigned J = 0; J < NumResourceUnits; ++J) {
double Pressure = 0.0;
if (UsageEntryIt != UsageEntryEnd && UsageEntryIt->ResourceIdx == J) {
Pressure = UsageEntryIt->Cycles / Executions;
++UsageEntryIt;
}
printResourcePressure(FOS, Pressure, (J + 1) * 7);
}
assert(UsageEntryIt == UsageEntryEnd);
FOS << printInstructionString(MCI) << '\n';
FOS.flush();
OS << Buffer;
Buffer = "";
++InstrIndex;
}
}
json::Value ResourcePressureView::toJSON() const {
// We're dumping the instructions and the ResourceUsage array.
json::Array ResourcePressureInfo;
// The ResourceUsage matrix is sparse, so we only consider
// non-zero values.
ArrayRef<llvm::MCInst> Source = getSource();
const unsigned Executions = LastInstructionIdx / Source.size() + 1;
auto AddToJSON = [&ResourcePressureInfo, Executions](
const ResourceReleaseAtCycles &RU, unsigned InstIndex) {
assert(RU.Cycles.getNumerator() != 0);
double Usage = RU.Cycles / Executions;
ResourcePressureInfo.push_back(
json::Object({{"InstructionIndex", InstIndex},
{"ResourceIndex", RU.ResourceIdx},
{"ResourceUsage", Usage}}));
};
for (const auto &[InstIndex, Usages] : enumerate(ResourceUsage))
for (const auto &RU : Usages)
AddToJSON(RU, InstIndex);
for (const auto &RU : CommonResourceUsage) {
if (RU.Cycles.getNumerator() != 0)
AddToJSON(RU, Source.size());
}
json::Object JO({{"ResourcePressureInfo", std::move(ResourcePressureInfo)}});
return JO;
}
} // namespace mca
} // namespace llvm
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