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//===-- BenchmarkRunner.cpp -------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include <array>
#include <string>
#include "Assembler.h"
#include "BenchmarkRunner.h"
#include "MCInstrDescView.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/Twine.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/FormatVariadic.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/Program.h"
namespace exegesis {
BenchmarkRunner::InstructionFilter::~InstructionFilter() = default;
BenchmarkRunner::BenchmarkRunner(const LLVMState &State)
: State(State), MCInstrInfo(State.getInstrInfo()),
MCRegisterInfo(State.getRegInfo()),
RATC(MCRegisterInfo,
getFunctionReservedRegs(*State.createTargetMachine())) {}
BenchmarkRunner::~BenchmarkRunner() = default;
InstructionBenchmark BenchmarkRunner::run(unsigned Opcode,
const InstructionFilter &Filter,
unsigned NumRepetitions) {
InstructionBenchmark InstrBenchmark;
InstrBenchmark.Key.OpcodeName = State.getInstrInfo().getName(Opcode);
InstrBenchmark.Key.Mode = getDisplayName();
InstrBenchmark.CpuName = State.getCpuName();
InstrBenchmark.LLVMTriple = State.getTriple();
InstrBenchmark.NumRepetitions = NumRepetitions;
// Ignore instructions that we cannot run.
if (State.getInstrInfo().get(Opcode).isPseudo()) {
InstrBenchmark.Error = "Unsupported opcode: isPseudo";
return InstrBenchmark;
}
if (llvm::Error E = Filter.shouldRun(State, Opcode)) {
InstrBenchmark.Error = llvm::toString(std::move(E));
return InstrBenchmark;
}
llvm::raw_string_ostream InfoStream(InstrBenchmark.Info);
llvm::Expected<std::vector<llvm::MCInst>> SnippetOrError =
createSnippet(RATC, Opcode, InfoStream);
if (llvm::Error E = SnippetOrError.takeError()) {
InstrBenchmark.Error = llvm::toString(std::move(E));
return InstrBenchmark;
}
std::vector<llvm::MCInst> &Snippet = SnippetOrError.get();
if (Snippet.empty()) {
InstrBenchmark.Error = "Empty snippet";
return InstrBenchmark;
}
InfoStream << "Snippet:\n";
for (const auto &MCInst : Snippet) {
DumpMCInst(MCRegisterInfo, MCInstrInfo, MCInst, InfoStream);
InfoStream << "\n";
}
std::vector<llvm::MCInst> Code;
for (int I = 0; I < InstrBenchmark.NumRepetitions; ++I)
Code.push_back(Snippet[I % Snippet.size()]);
auto ExpectedObjectPath = writeObjectFile(Code);
if (llvm::Error E = ExpectedObjectPath.takeError()) {
InstrBenchmark.Error = llvm::toString(std::move(E));
return InstrBenchmark;
}
// FIXME: Check if TargetMachine or ExecutionEngine can be reused instead of
// creating one everytime.
const ExecutableFunction EF(State.createTargetMachine(),
getObjectFromFile(*ExpectedObjectPath));
InstrBenchmark.Measurements = runMeasurements(EF, NumRepetitions);
return InstrBenchmark;
}
llvm::Expected<std::string>
BenchmarkRunner::writeObjectFile(llvm::ArrayRef<llvm::MCInst> Code) const {
int ResultFD = 0;
llvm::SmallString<256> ResultPath;
if (llvm::Error E = llvm::errorCodeToError(llvm::sys::fs::createTemporaryFile(
"snippet", "o", ResultFD, ResultPath)))
return std::move(E);
llvm::raw_fd_ostream OFS(ResultFD, true /*ShouldClose*/);
assembleToStream(State.createTargetMachine(), Code, OFS);
llvm::outs() << "Check generated assembly with: /usr/bin/objdump -d "
<< ResultPath << "\n";
return ResultPath.str();
}
} // namespace exegesis
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