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Re-land "[llvm-exegesis] Support analyzing results from a different target." 

With Mips fixes.

This reverts commit 7daf60e344.
This commit is contained in:
Clement Courbet 2022-09-22 11:27:44 +02:00
parent b2cd8118d0
commit e52f8406e8
7 changed files with 164 additions and 110 deletions
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80
llvm/tools/llvm-exegesis/lib/Analysis.cpp
View File

@ -102,6 +102,7 @@ template <typename EscapeTag, EscapeTag Tag>
void Analysis::writeSnippet(raw_ostream &OS, ArrayRef<uint8_t> Bytes,
const char *Separator) const {
SmallVector<std::string, 3> Lines;
const auto &SI = State_.getSubtargetInfo();
// Parse the asm snippet and print it.
while (!Bytes.empty()) {
MCInst MI;
@ -114,7 +115,7 @@ void Analysis::writeSnippet(raw_ostream &OS, ArrayRef<uint8_t> Bytes,
}
SmallString<128> InstPrinterStr; // FIXME: magic number.
raw_svector_ostream OSS(InstPrinterStr);
InstPrinter_->printInst(&MI, 0, "", *SubtargetInfo_, OSS);
InstPrinter_->printInst(&MI, 0, "", SI, OSS);
Bytes = Bytes.drop_front(MISize);
Lines.emplace_back(InstPrinterStr.str().trim());
}
@ -136,10 +137,10 @@ void Analysis::printInstructionRowCsv(const size_t PointId,
const MCInst &MCI = Point.keyInstruction();
unsigned SchedClassId;
std::tie(SchedClassId, std::ignore) = ResolvedSchedClass::resolveSchedClassId(
*SubtargetInfo_, *InstrInfo_, MCI);
State_.getSubtargetInfo(), State_.getInstrInfo(), MCI);
#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
const MCSchedClassDesc *const SCDesc =
SubtargetInfo_->getSchedModel().getSchedClassDesc(SchedClassId);
State_.getSubtargetInfo().getSchedModel().getSchedClassDesc(SchedClassId);
writeEscaped<kEscapeCsv>(OS, SCDesc->Name);
#else
OS << SchedClassId;
@ -151,38 +152,30 @@ void Analysis::printInstructionRowCsv(const size_t PointId,
OS << "\n";
}
Analysis::Analysis(const Target &Target,
std::unique_ptr<MCSubtargetInfo> SubtargetInfo,
std::unique_ptr<MCInstrInfo> InstrInfo,
Analysis::Analysis(const LLVMState &State,
const InstructionBenchmarkClustering &Clustering,
double AnalysisInconsistencyEpsilon,
bool AnalysisDisplayUnstableOpcodes,
const std::string &ForceCpuName)
: Clustering_(Clustering), SubtargetInfo_(std::move(SubtargetInfo)),
InstrInfo_(std::move(InstrInfo)),
bool AnalysisDisplayUnstableOpcodes)
: Clustering_(Clustering), State_(State),
AnalysisInconsistencyEpsilonSquared_(AnalysisInconsistencyEpsilon *
AnalysisInconsistencyEpsilon),
AnalysisDisplayUnstableOpcodes_(AnalysisDisplayUnstableOpcodes) {
if (Clustering.getPoints().empty())
return;
const InstructionBenchmark &FirstPoint = Clustering.getPoints().front();
const std::string CpuName =
ForceCpuName.empty() ? FirstPoint.CpuName : ForceCpuName;
RegInfo_.reset(Target.createMCRegInfo(FirstPoint.LLVMTriple));
MCTargetOptions MCOptions;
AsmInfo_.reset(
Target.createMCAsmInfo(*RegInfo_, FirstPoint.LLVMTriple, MCOptions));
SubtargetInfo_.reset(
Target.createMCSubtargetInfo(FirstPoint.LLVMTriple, CpuName, ""));
InstPrinter_.reset(Target.createMCInstPrinter(
Triple(FirstPoint.LLVMTriple), 0 /*default variant*/, *AsmInfo_,
*InstrInfo_, *RegInfo_));
const auto &TM = State.getTargetMachine();
const auto &Triple = TM.getTargetTriple();
AsmInfo_.reset(TM.getTarget().createMCAsmInfo(State_.getRegInfo(),
Triple.str(), MCOptions));
InstPrinter_.reset(TM.getTarget().createMCInstPrinter(
Triple, 0 /*default variant*/, *AsmInfo_, State_.getInstrInfo(),
State_.getRegInfo()));
Context_ =
std::make_unique<MCContext>(Triple(FirstPoint.LLVMTriple), AsmInfo_.get(),
RegInfo_.get(), SubtargetInfo_.get());
Disasm_.reset(Target.createMCDisassembler(*SubtargetInfo_, *Context_));
Context_ = std::make_unique<MCContext>(
Triple, AsmInfo_.get(), &State_.getRegInfo(), &State_.getSubtargetInfo());
Disasm_.reset(TM.getTarget().createMCDisassembler(State_.getSubtargetInfo(),
*Context_));
assert(Disasm_ && "cannot create MCDisassembler. missing call to "
"InitializeXXXTargetDisassembler ?");
}
@ -232,14 +225,14 @@ Analysis::makePointsPerSchedClass() const {
unsigned SchedClassId;
bool WasVariant;
std::tie(SchedClassId, WasVariant) =
ResolvedSchedClass::resolveSchedClassId(*SubtargetInfo_, *InstrInfo_,
MCI);
ResolvedSchedClass::resolveSchedClassId(State_.getSubtargetInfo(),
State_.getInstrInfo(), MCI);
const auto IndexIt = SchedClassIdToIndex.find(SchedClassId);
if (IndexIt == SchedClassIdToIndex.end()) {
// Create a new entry.
SchedClassIdToIndex.emplace(SchedClassId, Entries.size());
ResolvedSchedClassAndPoints Entry(
ResolvedSchedClass(*SubtargetInfo_, SchedClassId, WasVariant));
ResolvedSchedClassAndPoints Entry(ResolvedSchedClass(
State_.getSubtargetInfo(), SchedClassId, WasVariant));
Entry.PointIds.push_back(PointId);
Entries.push_back(std::move(Entry));
} else {
@ -284,11 +277,11 @@ void Analysis::printPointHtml(const InstructionBenchmark &Point,
OS << "\">";
switch (Point.Mode) {
case InstructionBenchmark::Latency:
writeLatencySnippetHtml(OS, Point.Key.Instructions, *InstrInfo_);
writeLatencySnippetHtml(OS, Point.Key.Instructions, State_.getInstrInfo());
break;
case InstructionBenchmark::Uops:
case InstructionBenchmark::InverseThroughput:
writeParallelSnippetHtml(OS, Point.Key.Instructions, *InstrInfo_);
writeParallelSnippetHtml(OS, Point.Key.Instructions, State_.getInstrInfo());
break;
default:
llvm_unreachable("invalid mode");
@ -314,7 +307,8 @@ void Analysis::printSchedClassClustersHtml(
OS << "</tr>";
for (const SchedClassCluster &Cluster : Clusters) {
OS << "<tr class=\""
<< (Cluster.measurementsMatch(*SubtargetInfo_, RSC, Clustering_,
<< (Cluster.measurementsMatch(State_.getSubtargetInfo(), RSC,
Clustering_,
AnalysisInconsistencyEpsilonSquared_)
? "good-cluster"
: "bad-cluster")
@ -383,15 +377,15 @@ void Analysis::printSchedClassDescHtml(const ResolvedSchedClass &RSC,
"idealized unit resource (port) pressure assuming ideal "
"distribution\">Idealized Resource Pressure</th></tr>";
if (RSC.SCDesc->isValid()) {
const auto &SM = SubtargetInfo_->getSchedModel();
const auto &SI = State_.getSubtargetInfo();
const auto &SM = SI.getSchedModel();
OS << "<tr><td>&#10004;</td>";
OS << "<td>" << (RSC.WasVariant ? "&#10004;" : "&#10005;") << "</td>";
OS << "<td>" << RSC.SCDesc->NumMicroOps << "</td>";
// Latencies.
OS << "<td><ul>";
for (int I = 0, E = RSC.SCDesc->NumWriteLatencyEntries; I < E; ++I) {
const auto *const Entry =
SubtargetInfo_->getWriteLatencyEntry(RSC.SCDesc, I);
const auto *const Entry = SI.getWriteLatencyEntry(RSC.SCDesc, I);
OS << "<li>" << Entry->Cycles;
if (RSC.SCDesc->NumWriteLatencyEntries > 1) {
// Dismabiguate if more than 1 latency.
@ -403,8 +397,7 @@ void Analysis::printSchedClassDescHtml(const ResolvedSchedClass &RSC,
// inverse throughput.
OS << "<td>";
writeMeasurementValue<kEscapeHtml>(
OS,
MCSchedModel::getReciprocalThroughput(*SubtargetInfo_, *RSC.SCDesc));
OS, MCSchedModel::getReciprocalThroughput(SI, *RSC.SCDesc));
OS << "</td>";
// WriteProcRes.
OS << "<td><ul>";
@ -419,9 +412,8 @@ void Analysis::printSchedClassDescHtml(const ResolvedSchedClass &RSC,
OS << "<td><ul>";
for (const auto &Pressure : RSC.IdealizedProcResPressure) {
OS << "<li><span class=\"mono\">";
writeEscaped<kEscapeHtml>(OS, SubtargetInfo_->getSchedModel()
.getProcResource(Pressure.first)
->Name);
writeEscaped<kEscapeHtml>(
OS, SI.getSchedModel().getProcResource(Pressure.first)->Name);
OS << "</span>: ";
writeMeasurementValue<kEscapeHtml>(OS, Pressure.second);
OS << "</li>";
@ -550,6 +542,7 @@ Error Analysis::run<Analysis::PrintSchedClassInconsistencies>(
writeEscaped<kEscapeHtml>(OS, FirstPoint.CpuName);
OS << "</span></h3>";
const auto &SI = State_.getSubtargetInfo();
for (const auto &RSCAndPoints : makePointsPerSchedClass()) {
if (!RSCAndPoints.RSC.SCDesc)
continue;
@ -574,10 +567,9 @@ Error Analysis::run<Analysis::PrintSchedClassInconsistencies>(
// Print any scheduling class that has at least one cluster that does not
// match the checked-in data.
if (all_of(SchedClassClusters, [this,
&RSCAndPoints](const SchedClassCluster &C) {
return C.measurementsMatch(*SubtargetInfo_, RSCAndPoints.RSC,
Clustering_,
if (all_of(SchedClassClusters, [this, &RSCAndPoints,
&SI](const SchedClassCluster &C) {
return C.measurementsMatch(SI, RSCAndPoints.RSC, Clustering_,
AnalysisInconsistencyEpsilonSquared_);
}))
continue; // Nothing weird.

10
llvm/tools/llvm-exegesis/lib/Analysis.h
View File

@ -36,12 +36,10 @@ namespace exegesis {
// A helper class to analyze benchmark results for a target.
class Analysis {
public:
Analysis(const Target &Target, std::unique_ptr<MCSubtargetInfo> SubtargetInfo,
std::unique_ptr<MCInstrInfo> InstrInfo,
Analysis(const LLVMState &State,
const InstructionBenchmarkClustering &Clustering,
double AnalysisInconsistencyEpsilon,
bool AnalysisDisplayUnstableOpcodes,
const std::string &ForceCpuName = "");
bool AnalysisDisplayUnstableOpcodes);
// Prints a csv of instructions for each cluster.
struct PrintClusters {};
@ -113,10 +111,8 @@ private:
const char *Separator) const;
const InstructionBenchmarkClustering &Clustering_;
const LLVMState &State_;
std::unique_ptr<MCContext> Context_;
std::unique_ptr<MCSubtargetInfo> SubtargetInfo_;
std::unique_ptr<MCInstrInfo> InstrInfo_;
std::unique_ptr<MCRegisterInfo> RegInfo_;
std::unique_ptr<MCAsmInfo> AsmInfo_;
std::unique_ptr<MCInstPrinter> InstPrinter_;
std::unique_ptr<MCDisassembler> Disasm_;

50
llvm/tools/llvm-exegesis/lib/BenchmarkResult.cpp
View File

@ -327,15 +327,44 @@ struct MappingContextTraits<exegesis::InstructionBenchmark, YamlContext> {
}
};
template <> struct MappingTraits<exegesis::InstructionBenchmark::TripleAndCpu> {
static void mapping(IO &Io,
exegesis::InstructionBenchmark::TripleAndCpu &Obj) {
assert(!Io.outputting() && "can only read TripleAndCpu");
// Read triple.
Io.mapRequired("llvm_triple", Obj.LLVMTriple);
Io.mapRequired("cpu_name", Obj.CpuName);
// Drop everything else.
}
};
} // namespace yaml
namespace exegesis {
Expected<std::set<InstructionBenchmark::TripleAndCpu>>
InstructionBenchmark::readTriplesAndCpusFromYamls(MemoryBufferRef Buffer) {
// We're only mapping a field, drop other fields and silence the corresponding
// warnings.
yaml::Input Yin(
Buffer, nullptr, +[](const SMDiagnostic &, void *Context) {});
Yin.setAllowUnknownKeys(true);
std::set<TripleAndCpu> Result;
yaml::EmptyContext Context;
while (Yin.setCurrentDocument()) {
TripleAndCpu TC;
yamlize(Yin, TC, /*unused*/ true, Context);
if (Yin.error())
return errorCodeToError(Yin.error());
Result.insert(TC);
Yin.nextDocument();
}
return Result;
}
Expected<InstructionBenchmark>
InstructionBenchmark::readYaml(const LLVMState &State, StringRef Filename) {
if (auto ExpectedMemoryBuffer =
errorOrToExpected(MemoryBuffer::getFile(Filename, /*IsText=*/true))) {
yaml::Input Yin(*ExpectedMemoryBuffer.get());
InstructionBenchmark::readYaml(const LLVMState &State, MemoryBufferRef Buffer) {
yaml::Input Yin(Buffer);
YamlContext Context(State);
InstructionBenchmark Benchmark;
if (Yin.setCurrentDocument())
@ -343,16 +372,12 @@ InstructionBenchmark::readYaml(const LLVMState &State, StringRef Filename) {
if (!Context.getLastError().empty())
return make_error<Failure>(Context.getLastError());
return Benchmark;
} else {
return ExpectedMemoryBuffer.takeError();
}
}
Expected<std::vector<InstructionBenchmark>>
InstructionBenchmark::readYamls(const LLVMState &State, StringRef Filename) {
if (auto ExpectedMemoryBuffer =
errorOrToExpected(MemoryBuffer::getFile(Filename, /*IsText=*/true))) {
yaml::Input Yin(*ExpectedMemoryBuffer.get());
InstructionBenchmark::readYamls(const LLVMState &State,
MemoryBufferRef Buffer) {
yaml::Input Yin(Buffer);
YamlContext Context(State);
std::vector<InstructionBenchmark> Benchmarks;
while (Yin.setCurrentDocument()) {
@ -365,9 +390,6 @@ InstructionBenchmark::readYamls(const LLVMState &State, StringRef Filename) {
Yin.nextDocument();
}
return Benchmarks;
} else {
return ExpectedMemoryBuffer.takeError();
}
}
Error InstructionBenchmark::writeYamlTo(const LLVMState &State,

18
llvm/tools/llvm-exegesis/lib/BenchmarkResult.h
View File

@ -19,10 +19,12 @@
#include "RegisterValue.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/StringSet.h"
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCInstBuilder.h"
#include "llvm/Support/YAMLTraits.h"
#include <limits>
#include <set>
#include <string>
#include <unordered_map>
#include <vector>
@ -78,10 +80,22 @@ struct InstructionBenchmark {
enum ResultAggregationModeE { Min, Max, Mean, MinVariance };
// Read functions.
static Expected<InstructionBenchmark> readYaml(const LLVMState &State,
StringRef Filename);
MemoryBufferRef Buffer);
static Expected<std::vector<InstructionBenchmark>>
readYamls(const LLVMState &State, StringRef Filename);
readYamls(const LLVMState &State, MemoryBufferRef Buffer);
// Given a set of serialized instruction benchmarks, returns the set of
// triples and CPUs that appear in the list of benchmarks.
struct TripleAndCpu {
std::string LLVMTriple;
std::string CpuName;
bool operator<(const TripleAndCpu &O) const {
return std::tie(LLVMTriple, CpuName) < std::tie(O.LLVMTriple, O.CpuName);
}
};
static Expected<std::set<TripleAndCpu>>
readTriplesAndCpusFromYamls(MemoryBufferRef Buffer);
class Error readYamlFrom(const LLVMState &State, StringRef InputContent);

52
llvm/tools/llvm-exegesis/llvm-exegesis.cpp
View File

@ -416,40 +416,50 @@ static void analysisMain() {
InitializeNativeTargetDisassembler();
InitializeNativeExegesisTarget();
auto MemoryBuffer = ExitOnFileError(
BenchmarkFile,
errorOrToExpected(MemoryBuffer::getFile(BenchmarkFile, /*IsText=*/true)));
const auto TriplesAndCpus = ExitOnFileError(
BenchmarkFile,
InstructionBenchmark::readTriplesAndCpusFromYamls(*MemoryBuffer));
if (TriplesAndCpus.empty()) {
errs() << "no benchmarks to analyze\n";
return;
}
if (TriplesAndCpus.size() > 1) {
ExitWithError("analysis file contains benchmarks from several CPUs. This "
"is unsupported.");
}
auto TripleAndCpu = *TriplesAndCpus.begin();
if (!CpuName.empty()) {
llvm::errs() << "overridding file CPU name (" << TripleAndCpu.CpuName
<< ") with provided CPU name (" << CpuName << ")\n";
TripleAndCpu.CpuName = CpuName;
}
llvm::errs() << "using Triple '" << TripleAndCpu.LLVMTriple << "' and CPU '"
<< TripleAndCpu.CpuName << "'\n";
// Read benchmarks.
const LLVMState State = ExitOnErr(LLVMState::Create("", ""));
const LLVMState State = ExitOnErr(
LLVMState::Create(TripleAndCpu.LLVMTriple, TripleAndCpu.CpuName));
const std::vector<InstructionBenchmark> Points = ExitOnFileError(
BenchmarkFile, InstructionBenchmark::readYamls(State, BenchmarkFile));
BenchmarkFile, InstructionBenchmark::readYamls(State, *MemoryBuffer));
outs() << "Parsed " << Points.size() << " benchmark points\n";
if (Points.empty()) {
errs() << "no benchmarks to analyze\n";
return;
}
// FIXME: Check that all points have the same triple/cpu.
// FIXME: Merge points from several runs (latency and uops).
std::string Error;
const auto *TheTarget =
TargetRegistry::lookupTarget(Points[0].LLVMTriple, Error);
if (!TheTarget) {
errs() << "unknown target '" << Points[0].LLVMTriple << "'\n";
return;
}
std::unique_ptr<MCSubtargetInfo> SubtargetInfo(
TheTarget->createMCSubtargetInfo(Points[0].LLVMTriple, CpuName, ""));
std::unique_ptr<MCInstrInfo> InstrInfo(TheTarget->createMCInstrInfo());
assert(InstrInfo && "Unable to create instruction info!");
const auto Clustering = ExitOnErr(InstructionBenchmarkClustering::create(
Points, AnalysisClusteringAlgorithm, AnalysisDbscanNumPoints,
AnalysisClusteringEpsilon, SubtargetInfo.get(), InstrInfo.get()));
AnalysisClusteringEpsilon, &State.getSubtargetInfo(),
&State.getInstrInfo()));
const Analysis Analyzer(
*TheTarget, std::move(SubtargetInfo), std::move(InstrInfo), Clustering,
AnalysisInconsistencyEpsilon, AnalysisDisplayUnstableOpcodes, CpuName);
const Analysis Analyzer(State, Clustering, AnalysisInconsistencyEpsilon,
AnalysisDisplayUnstableOpcodes);
maybeRunAnalysis<Analysis::PrintClusters>(Analyzer, "analysis clusters",
AnalysisClustersOutputFile);

7
llvm/unittests/tools/llvm-exegesis/Mips/BenchmarkResultTest.cpp
View File

@ -80,10 +80,13 @@ TEST_F(MipsBenchmarkResultTest, WriteToAndReadFromDisk) {
errs() << Filename << "-------\n";
ExitOnErr(ToDisk.writeYaml(State, Filename));
const std::unique_ptr<MemoryBuffer> Buffer =
std::move(*MemoryBuffer::getFile(Filename));
{
// One-element version.
const auto FromDisk =
ExitOnErr(InstructionBenchmark::readYaml(State, Filename));
ExitOnErr(InstructionBenchmark::readYaml(State, *Buffer));
EXPECT_THAT(FromDisk.Key.Instructions,
Pointwise(EqMCInst(), ToDisk.Key.Instructions));
@ -99,7 +102,7 @@ TEST_F(MipsBenchmarkResultTest, WriteToAndReadFromDisk) {
{
// Vector version.
const auto FromDiskVector =
ExitOnErr(InstructionBenchmark::readYamls(State, Filename));
ExitOnErr(InstructionBenchmark::readYamls(State, *Buffer));
ASSERT_EQ(FromDiskVector.size(), size_t{1});
const auto FromDisk = FromDiskVector[0];
EXPECT_THAT(FromDisk.Key.Instructions,

21
llvm/unittests/tools/llvm-exegesis/X86/BenchmarkResultTest.cpp
View File

@ -20,7 +20,9 @@
#include "gtest/gtest.h"
using ::testing::AllOf;
using ::testing::ElementsAre;
using ::testing::Eq;
using ::testing::Field;
using ::testing::get;
using ::testing::Pointwise;
using ::testing::Property;
@ -89,10 +91,25 @@ TEST(BenchmarkResultTest, WriteToAndReadFromDisk) {
errs() << Filename << "-------\n";
ExitOnErr(ToDisk.writeYaml(State, Filename));
const std::unique_ptr<MemoryBuffer> Buffer =
std::move(*MemoryBuffer::getFile(Filename));
{
// Read Triples/Cpu only.
const auto TriplesAndCpus =
ExitOnErr(InstructionBenchmark::readTriplesAndCpusFromYamls(*Buffer));
ASSERT_THAT(TriplesAndCpus,
testing::ElementsAre(
AllOf(Field(&InstructionBenchmark::TripleAndCpu::LLVMTriple,
Eq("llvm_triple")),
Field(&InstructionBenchmark::TripleAndCpu::CpuName,
Eq("cpu_name")))));
}
{
// One-element version.
const auto FromDisk =
ExitOnErr(InstructionBenchmark::readYaml(State, Filename));
ExitOnErr(InstructionBenchmark::readYaml(State, *Buffer));
EXPECT_THAT(FromDisk.Key.Instructions,
Pointwise(EqMCInst(), ToDisk.Key.Instructions));
@ -108,7 +125,7 @@ TEST(BenchmarkResultTest, WriteToAndReadFromDisk) {
{
// Vector version.
const auto FromDiskVector =
ExitOnErr(InstructionBenchmark::readYamls(State, Filename));
ExitOnErr(InstructionBenchmark::readYamls(State, *Buffer));
ASSERT_EQ(FromDiskVector.size(), size_t{1});
const auto FromDisk = FromDiskVector[0];
EXPECT_THAT(FromDisk.Key.Instructions,