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431 lines
15 KiB
C++
431 lines
15 KiB
C++
//===-- BenchmarkResult.cpp -------------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "BenchmarkResult.h"
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#include "BenchmarkRunner.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/ADT/ScopeExit.h"
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#include "llvm/ADT/StringMap.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/ADT/bit.h"
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#include "llvm/ObjectYAML/YAML.h"
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#include "llvm/Support/FileOutputBuffer.h"
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#include "llvm/Support/FileSystem.h"
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#include "llvm/Support/Format.h"
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#include "llvm/Support/raw_ostream.h"
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static constexpr const char kIntegerPrefix[] = "i_0x";
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static constexpr const char kDoublePrefix[] = "f_";
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static constexpr const char kInvalidOperand[] = "INVALID";
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static constexpr llvm::StringLiteral kNoRegister("%noreg");
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namespace llvm {
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namespace {
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// A mutable struct holding an LLVMState that can be passed through the
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// serialization process to encode/decode registers and instructions.
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struct YamlContext {
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YamlContext(const exegesis::LLVMState &State)
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: State(&State), ErrorStream(LastError),
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OpcodeNameToOpcodeIdx(
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generateOpcodeNameToOpcodeIdxMapping(State.getInstrInfo())),
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RegNameToRegNo(generateRegNameToRegNoMapping(State.getRegInfo())) {}
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static llvm::StringMap<unsigned>
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generateOpcodeNameToOpcodeIdxMapping(const llvm::MCInstrInfo &InstrInfo) {
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llvm::StringMap<unsigned> Map(InstrInfo.getNumOpcodes());
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for (unsigned I = 0, E = InstrInfo.getNumOpcodes(); I < E; ++I)
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Map[InstrInfo.getName(I)] = I;
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assert(Map.size() == InstrInfo.getNumOpcodes() && "Size prediction failed");
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return Map;
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};
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llvm::StringMap<unsigned>
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generateRegNameToRegNoMapping(const llvm::MCRegisterInfo &RegInfo) {
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llvm::StringMap<unsigned> Map(RegInfo.getNumRegs());
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// Special-case RegNo 0, which would otherwise be spelled as ''.
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Map[kNoRegister] = 0;
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for (unsigned I = 1, E = RegInfo.getNumRegs(); I < E; ++I)
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Map[RegInfo.getName(I)] = I;
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assert(Map.size() == RegInfo.getNumRegs() && "Size prediction failed");
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return Map;
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};
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void serializeMCInst(const llvm::MCInst &MCInst, llvm::raw_ostream &OS) {
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OS << getInstrName(MCInst.getOpcode());
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for (const auto &Op : MCInst) {
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OS << ' ';
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serializeMCOperand(Op, OS);
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}
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}
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void deserializeMCInst(llvm::StringRef String, llvm::MCInst &Value) {
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llvm::SmallVector<llvm::StringRef, 16> Pieces;
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String.split(Pieces, " ", /* MaxSplit */ -1, /* KeepEmpty */ false);
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if (Pieces.empty()) {
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ErrorStream << "Unknown Instruction: '" << String << "'\n";
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return;
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}
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bool ProcessOpcode = true;
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for (llvm::StringRef Piece : Pieces) {
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if (ProcessOpcode)
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Value.setOpcode(getInstrOpcode(Piece));
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else
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Value.addOperand(deserializeMCOperand(Piece));
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ProcessOpcode = false;
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}
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}
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std::string &getLastError() { return ErrorStream.str(); }
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llvm::raw_string_ostream &getErrorStream() { return ErrorStream; }
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llvm::StringRef getRegName(unsigned RegNo) {
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// Special case: RegNo 0 is NoRegister. We have to deal with it explicitly.
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if (RegNo == 0)
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return kNoRegister;
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const llvm::StringRef RegName = State->getRegInfo().getName(RegNo);
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if (RegName.empty())
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ErrorStream << "No register with enum value '" << RegNo << "'\n";
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return RegName;
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}
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llvm::Optional<unsigned> getRegNo(llvm::StringRef RegName) {
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auto Iter = RegNameToRegNo.find(RegName);
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if (Iter != RegNameToRegNo.end())
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return Iter->second;
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ErrorStream << "No register with name '" << RegName << "'\n";
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return llvm::None;
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}
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private:
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void serializeIntegerOperand(llvm::raw_ostream &OS, int64_t Value) {
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OS << kIntegerPrefix;
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OS.write_hex(llvm::bit_cast<uint64_t>(Value));
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}
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bool tryDeserializeIntegerOperand(llvm::StringRef String, int64_t &Value) {
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if (!String.consume_front(kIntegerPrefix))
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return false;
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return !String.consumeInteger(16, Value);
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}
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void serializeFPOperand(llvm::raw_ostream &OS, double Value) {
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OS << kDoublePrefix << llvm::format("%la", Value);
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}
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bool tryDeserializeFPOperand(llvm::StringRef String, double &Value) {
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if (!String.consume_front(kDoublePrefix))
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return false;
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char *EndPointer = nullptr;
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Value = strtod(String.begin(), &EndPointer);
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return EndPointer == String.end();
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}
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void serializeMCOperand(const llvm::MCOperand &MCOperand,
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llvm::raw_ostream &OS) {
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if (MCOperand.isReg()) {
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OS << getRegName(MCOperand.getReg());
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} else if (MCOperand.isImm()) {
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serializeIntegerOperand(OS, MCOperand.getImm());
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} else if (MCOperand.isFPImm()) {
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serializeFPOperand(OS, MCOperand.getFPImm());
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} else {
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OS << kInvalidOperand;
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}
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}
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llvm::MCOperand deserializeMCOperand(llvm::StringRef String) {
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assert(!String.empty());
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int64_t IntValue = 0;
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double DoubleValue = 0;
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if (tryDeserializeIntegerOperand(String, IntValue))
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return llvm::MCOperand::createImm(IntValue);
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if (tryDeserializeFPOperand(String, DoubleValue))
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return llvm::MCOperand::createFPImm(DoubleValue);
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if (auto RegNo = getRegNo(String))
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return llvm::MCOperand::createReg(*RegNo);
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if (String != kInvalidOperand)
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ErrorStream << "Unknown Operand: '" << String << "'\n";
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return {};
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}
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llvm::StringRef getInstrName(unsigned InstrNo) {
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const llvm::StringRef InstrName = State->getInstrInfo().getName(InstrNo);
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if (InstrName.empty())
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ErrorStream << "No opcode with enum value '" << InstrNo << "'\n";
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return InstrName;
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}
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unsigned getInstrOpcode(llvm::StringRef InstrName) {
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auto Iter = OpcodeNameToOpcodeIdx.find(InstrName);
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if (Iter != OpcodeNameToOpcodeIdx.end())
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return Iter->second;
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ErrorStream << "No opcode with name '" << InstrName << "'\n";
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return 0;
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}
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const llvm::exegesis::LLVMState *State;
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std::string LastError;
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llvm::raw_string_ostream ErrorStream;
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const llvm::StringMap<unsigned> OpcodeNameToOpcodeIdx;
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const llvm::StringMap<unsigned> RegNameToRegNo;
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};
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} // namespace
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// Defining YAML traits for IO.
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namespace yaml {
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static YamlContext &getTypedContext(void *Ctx) {
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return *reinterpret_cast<YamlContext *>(Ctx);
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}
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// std::vector<llvm::MCInst> will be rendered as a list.
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template <> struct SequenceElementTraits<llvm::MCInst> {
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static const bool flow = false;
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};
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template <> struct ScalarTraits<llvm::MCInst> {
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static void output(const llvm::MCInst &Value, void *Ctx,
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llvm::raw_ostream &Out) {
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getTypedContext(Ctx).serializeMCInst(Value, Out);
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}
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static StringRef input(StringRef Scalar, void *Ctx, llvm::MCInst &Value) {
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YamlContext &Context = getTypedContext(Ctx);
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Context.deserializeMCInst(Scalar, Value);
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return Context.getLastError();
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}
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// By default strings are quoted only when necessary.
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// We force the use of single quotes for uniformity.
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static QuotingType mustQuote(StringRef) { return QuotingType::Single; }
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static const bool flow = true;
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};
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// std::vector<exegesis::Measure> will be rendered as a list.
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template <> struct SequenceElementTraits<exegesis::BenchmarkMeasure> {
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static const bool flow = false;
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};
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// exegesis::Measure is rendererd as a flow instead of a list.
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// e.g. { "key": "the key", "value": 0123 }
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template <> struct MappingTraits<exegesis::BenchmarkMeasure> {
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static void mapping(IO &Io, exegesis::BenchmarkMeasure &Obj) {
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Io.mapRequired("key", Obj.Key);
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if (!Io.outputting()) {
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// For backward compatibility, interpret debug_string as a key.
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Io.mapOptional("debug_string", Obj.Key);
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}
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Io.mapRequired("value", Obj.PerInstructionValue);
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Io.mapOptional("per_snippet_value", Obj.PerSnippetValue);
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}
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static const bool flow = true;
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};
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template <>
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struct ScalarEnumerationTraits<exegesis::InstructionBenchmark::ModeE> {
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static void enumeration(IO &Io,
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exegesis::InstructionBenchmark::ModeE &Value) {
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Io.enumCase(Value, "", exegesis::InstructionBenchmark::Unknown);
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Io.enumCase(Value, "latency", exegesis::InstructionBenchmark::Latency);
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Io.enumCase(Value, "uops", exegesis::InstructionBenchmark::Uops);
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Io.enumCase(Value, "inverse_throughput",
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exegesis::InstructionBenchmark::InverseThroughput);
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}
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};
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// std::vector<exegesis::RegisterValue> will be rendered as a list.
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template <> struct SequenceElementTraits<exegesis::RegisterValue> {
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static const bool flow = false;
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};
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template <> struct ScalarTraits<exegesis::RegisterValue> {
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static constexpr const unsigned kRadix = 16;
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static constexpr const bool kSigned = false;
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static void output(const exegesis::RegisterValue &RV, void *Ctx,
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llvm::raw_ostream &Out) {
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YamlContext &Context = getTypedContext(Ctx);
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Out << Context.getRegName(RV.Register) << "=0x"
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<< RV.Value.toString(kRadix, kSigned);
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}
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static StringRef input(StringRef String, void *Ctx,
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exegesis::RegisterValue &RV) {
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llvm::SmallVector<llvm::StringRef, 2> Pieces;
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String.split(Pieces, "=0x", /* MaxSplit */ -1,
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/* KeepEmpty */ false);
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YamlContext &Context = getTypedContext(Ctx);
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llvm::Optional<unsigned> RegNo;
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if (Pieces.size() == 2 && (RegNo = Context.getRegNo(Pieces[0]))) {
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RV.Register = *RegNo;
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const unsigned BitsNeeded = llvm::APInt::getBitsNeeded(Pieces[1], kRadix);
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RV.Value = llvm::APInt(BitsNeeded, Pieces[1], kRadix);
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} else {
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Context.getErrorStream()
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<< "Unknown initial register value: '" << String << "'";
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}
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return Context.getLastError();
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}
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static QuotingType mustQuote(StringRef) { return QuotingType::Single; }
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static const bool flow = true;
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};
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template <>
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struct MappingContextTraits<exegesis::InstructionBenchmarkKey, YamlContext> {
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static void mapping(IO &Io, exegesis::InstructionBenchmarkKey &Obj,
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YamlContext &Context) {
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Io.setContext(&Context);
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Io.mapRequired("instructions", Obj.Instructions);
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Io.mapOptional("config", Obj.Config);
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Io.mapRequired("register_initial_values", Obj.RegisterInitialValues);
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}
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};
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template <>
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struct MappingContextTraits<exegesis::InstructionBenchmark, YamlContext> {
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struct NormalizedBinary {
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NormalizedBinary(IO &io) {}
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NormalizedBinary(IO &, std::vector<uint8_t> &Data) : Binary(Data) {}
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std::vector<uint8_t> denormalize(IO &) {
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std::vector<uint8_t> Data;
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std::string Str;
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raw_string_ostream OSS(Str);
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Binary.writeAsBinary(OSS);
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OSS.flush();
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Data.assign(Str.begin(), Str.end());
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return Data;
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}
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BinaryRef Binary;
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};
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static void mapping(IO &Io, exegesis::InstructionBenchmark &Obj,
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YamlContext &Context) {
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Io.mapRequired("mode", Obj.Mode);
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Io.mapRequired("key", Obj.Key, Context);
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Io.mapRequired("cpu_name", Obj.CpuName);
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Io.mapRequired("llvm_triple", Obj.LLVMTriple);
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Io.mapRequired("num_repetitions", Obj.NumRepetitions);
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Io.mapRequired("measurements", Obj.Measurements);
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Io.mapRequired("error", Obj.Error);
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Io.mapOptional("info", Obj.Info);
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// AssembledSnippet
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MappingNormalization<NormalizedBinary, std::vector<uint8_t>> BinaryString(
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Io, Obj.AssembledSnippet);
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Io.mapOptional("assembled_snippet", BinaryString->Binary);
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}
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};
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} // namespace yaml
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namespace exegesis {
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llvm::Expected<InstructionBenchmark>
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InstructionBenchmark::readYaml(const LLVMState &State,
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llvm::StringRef Filename) {
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if (auto ExpectedMemoryBuffer =
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llvm::errorOrToExpected(llvm::MemoryBuffer::getFile(Filename))) {
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llvm::yaml::Input Yin(*ExpectedMemoryBuffer.get());
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YamlContext Context(State);
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InstructionBenchmark Benchmark;
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if (Yin.setCurrentDocument())
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llvm::yaml::yamlize(Yin, Benchmark, /*unused*/ true, Context);
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if (!Context.getLastError().empty())
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return llvm::make_error<BenchmarkFailure>(Context.getLastError());
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return Benchmark;
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} else {
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return ExpectedMemoryBuffer.takeError();
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}
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}
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llvm::Expected<std::vector<InstructionBenchmark>>
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InstructionBenchmark::readYamls(const LLVMState &State,
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llvm::StringRef Filename) {
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if (auto ExpectedMemoryBuffer =
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llvm::errorOrToExpected(llvm::MemoryBuffer::getFile(Filename))) {
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llvm::yaml::Input Yin(*ExpectedMemoryBuffer.get());
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YamlContext Context(State);
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std::vector<InstructionBenchmark> Benchmarks;
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while (Yin.setCurrentDocument()) {
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Benchmarks.emplace_back();
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yamlize(Yin, Benchmarks.back(), /*unused*/ true, Context);
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if (Yin.error())
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return llvm::errorCodeToError(Yin.error());
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if (!Context.getLastError().empty())
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return llvm::make_error<BenchmarkFailure>(Context.getLastError());
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Yin.nextDocument();
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}
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return Benchmarks;
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} else {
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return ExpectedMemoryBuffer.takeError();
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}
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}
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llvm::Error InstructionBenchmark::writeYamlTo(const LLVMState &State,
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llvm::raw_ostream &OS) {
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auto Cleanup = make_scope_exit([&] { OS.flush(); });
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llvm::yaml::Output Yout(OS, nullptr /*Ctx*/, 200 /*WrapColumn*/);
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YamlContext Context(State);
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Yout.beginDocuments();
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llvm::yaml::yamlize(Yout, *this, /*unused*/ true, Context);
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if (!Context.getLastError().empty())
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return llvm::make_error<BenchmarkFailure>(Context.getLastError());
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Yout.endDocuments();
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return Error::success();
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}
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llvm::Error InstructionBenchmark::readYamlFrom(const LLVMState &State,
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llvm::StringRef InputContent) {
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llvm::yaml::Input Yin(InputContent);
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YamlContext Context(State);
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if (Yin.setCurrentDocument())
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llvm::yaml::yamlize(Yin, *this, /*unused*/ true, Context);
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if (!Context.getLastError().empty())
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return llvm::make_error<BenchmarkFailure>(Context.getLastError());
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return Error::success();
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}
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llvm::Error InstructionBenchmark::writeYaml(const LLVMState &State,
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const llvm::StringRef Filename) {
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if (Filename == "-") {
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if (auto Err = writeYamlTo(State, llvm::outs()))
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return Err;
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} else {
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int ResultFD = 0;
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if (auto E = llvm::errorCodeToError(
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openFileForWrite(Filename, ResultFD, llvm::sys::fs::CD_CreateAlways,
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llvm::sys::fs::OF_Text))) {
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return E;
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}
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llvm::raw_fd_ostream Ostr(ResultFD, true /*shouldClose*/);
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if (auto Err = writeYamlTo(State, Ostr))
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return Err;
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}
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return llvm::Error::success();
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}
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void PerInstructionStats::push(const BenchmarkMeasure &BM) {
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if (Key.empty())
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Key = BM.Key;
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assert(Key == BM.Key);
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++NumValues;
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SumValues += BM.PerInstructionValue;
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MaxValue = std::max(MaxValue, BM.PerInstructionValue);
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MinValue = std::min(MinValue, BM.PerInstructionValue);
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}
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} // namespace exegesis
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} // namespace llvm
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