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//===-- llvm-exegesis.cpp ---------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
///
/// \file
/// Measures execution properties (latencies/uops) of an instruction.
///
//===----------------------------------------------------------------------===//
#include "lib/Analysis.h"
#include "lib/BenchmarkResult.h"
#include "lib/BenchmarkRunner.h"
#include "lib/Clustering.h"
#include "lib/Latency.h"
#include "lib/LlvmState.h"
#include "lib/PerfHelper.h"
#include "lib/Uops.h"
#include "lib/X86.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/Twine.h"
#include "llvm/MC/MCInstBuilder.h"
#include "llvm/MC/MCRegisterInfo.h"
#include "llvm/MC/MCSubtargetInfo.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/TargetRegistry.h"
#include "llvm/Support/TargetSelect.h"
#include <algorithm>
#include <random>
#include <string>
#include <unordered_map>
static llvm::cl::opt<unsigned>
OpcodeIndex("opcode-index", llvm::cl::desc("opcode to measure, by index"),
llvm::cl::init(0));
static llvm::cl::opt<std::string>
OpcodeName("opcode-name", llvm::cl::desc("opcode to measure, by name"),
llvm::cl::init(""));
static llvm::cl::opt<std::string>
BenchmarkFile("benchmarks-file", llvm::cl::desc(""), llvm::cl::init("-"));
enum class BenchmarkModeE { Latency, Uops, Analysis };
static llvm::cl::opt<BenchmarkModeE> BenchmarkMode(
"benchmark-mode", llvm::cl::desc("the benchmark mode to run"),
llvm::cl::values(
clEnumValN(BenchmarkModeE::Latency, "latency", "Instruction Latency"),
clEnumValN(BenchmarkModeE::Uops, "uops", "Uop Decomposition"),
clEnumValN(BenchmarkModeE::Analysis, "analysis", "Analysis")));
static llvm::cl::opt<unsigned>
NumRepetitions("num-repetitions",
llvm::cl::desc("number of time to repeat the asm snippet"),
llvm::cl::init(10000));
static llvm::cl::opt<unsigned> AnalysisNumPoints(
"analysis-numpoints",
llvm::cl::desc("minimum number of points in an analysis cluster"),
llvm::cl::init(3));
static llvm::cl::opt<float>
AnalysisEpsilon("analysis-epsilon",
llvm::cl::desc("dbscan epsilon for analysis clustering"),
llvm::cl::init(0.1));
namespace exegesis {
void benchmarkMain() {
if (exegesis::pfm::pfmInitialize())
llvm::report_fatal_error("cannot initialize libpfm");
if (OpcodeName.empty() == (OpcodeIndex == 0))
llvm::report_fatal_error(
"please provide one and only one of 'opcode-index' or 'opcode-name'");
llvm::InitializeNativeTarget();
llvm::InitializeNativeTargetAsmPrinter();
// FIXME: Target-specific filter.
X86Filter Filter;
const LLVMState State;
if (!State.getSubtargetInfo().getSchedModel().hasExtraProcessorInfo())
llvm::report_fatal_error("sched model is missing extra processor info!");
unsigned Opcode = OpcodeIndex;
if (Opcode == 0) {
// Resolve opcode name -> opcode.
for (unsigned I = 0, E = State.getInstrInfo().getNumOpcodes(); I < E; ++I) {
if (State.getInstrInfo().getName(I) == OpcodeName) {
Opcode = I;
break;
}
}
if (Opcode == 0) {
llvm::report_fatal_error(
llvm::Twine("unknown opcode ").concat(OpcodeName));
}
}
std::unique_ptr<BenchmarkRunner> Runner;
switch (BenchmarkMode) {
case BenchmarkModeE::Latency:
Runner = llvm::make_unique<LatencyBenchmarkRunner>();
break;
case BenchmarkModeE::Uops:
Runner = llvm::make_unique<UopsBenchmarkRunner>();
break;
case BenchmarkModeE::Analysis:
llvm_unreachable("not a benchmark");
}
Runner->run(State, Opcode, NumRepetitions > 0 ? NumRepetitions : 1, Filter)
.writeYamlOrDie(BenchmarkFile);
exegesis::pfm::pfmTerminate();
}
void analysisMain() {
// Read benchmarks.
const std::vector<InstructionBenchmark> Points =
InstructionBenchmark::readYamlsOrDie(BenchmarkFile);
llvm::outs() << "Parsed " << Points.size() << " benchmark points\n";
if (Points.empty()) {
llvm::errs() << "no benchmarks to analyze\n";
return;
}
// TODO: Merge points from several runs (latency and uops).
// FIXME: Check that all points have the same triple/cpu.
llvm::InitializeAllTargets();
std::string Error;
const auto *TheTarget =
llvm::TargetRegistry::lookupTarget(Points[0].LLVMTriple, Error);
if (!TheTarget) {
llvm::errs() << "unknown target '" << Points[0].LLVMTriple << "'\n";
return;
}
std::unique_ptr<llvm::MCSubtargetInfo> STI(TheTarget->createMCSubtargetInfo(
Points[0].LLVMTriple, Points[0].CpuName, ""));
const auto Clustering = llvm::cantFail(InstructionBenchmarkClustering::create(
Points, AnalysisNumPoints, AnalysisEpsilon));
if (auto Err = printAnalysisClusters(Clustering, *STI, llvm::outs())) {
llvm::report_fatal_error(std::move(Err));
}
}
} // namespace exegesis
int main(int Argc, char **Argv) {
llvm::cl::ParseCommandLineOptions(Argc, Argv, "");
if (BenchmarkMode == BenchmarkModeE::Analysis) {
exegesis::analysisMain();
} else {
exegesis::benchmarkMain();
}
return EXIT_SUCCESS;
}
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