//===-- BenchmarkResultTest.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
//
//===----------------------------------------------------------------------===//

#include "BenchmarkResult.h"
#include "X86InstrInfo.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/Support/Error.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/TargetRegistry.h"
#include "llvm/Support/TargetSelect.h"
#include "llvm/Support/YAMLTraits.h"
#include "llvm/Support/raw_ostream.h"
#include "gmock/gmock.h"
#include "gtest/gtest.h"

using ::testing::AllOf;
using ::testing::Eq;
using ::testing::get;
using ::testing::Pointwise;
using ::testing::Property;

namespace llvm {
namespace exegesis {

bool operator==(const BenchmarkMeasure &A, const BenchmarkMeasure &B) {
  return std::tie(A.Key, A.PerInstructionValue, A.PerSnippetValue) ==
         std::tie(B.Key, B.PerInstructionValue, B.PerSnippetValue);
}

static std::string Dump(const MCInst &McInst) {
  std::string Buffer;
  raw_string_ostream OS(Buffer);
  McInst.print(OS);
  return Buffer;
}

MATCHER(EqMCInst, "") {
  const std::string Lhs = Dump(get<0>(arg));
  const std::string Rhs = Dump(get<1>(arg));
  if (Lhs != Rhs) {
    *result_listener << Lhs << " <=> " << Rhs;
    return false;
  }
  return true;
}

namespace {

TEST(BenchmarkResultTest, WriteToAndReadFromDisk) {
  LLVMInitializeX86TargetInfo();
  LLVMInitializeX86Target();
  LLVMInitializeX86TargetMC();

  // Read benchmarks.
  const LLVMState State("x86_64-unknown-linux", "haswell");

  ExitOnError ExitOnErr;

  InstructionBenchmark ToDisk;

  ToDisk.Key.Instructions.push_back(MCInstBuilder(X86::XOR32rr)
                                        .addReg(X86::AL)
                                        .addReg(X86::AH)
                                        .addImm(123)
                                        .addDFPImm(bit_cast<uint64_t>(0.5)));
  ToDisk.Key.Config = "config";
  ToDisk.Key.RegisterInitialValues = {
      RegisterValue{X86::AL, APInt(8, "-1", 10)},
      RegisterValue{X86::AH, APInt(8, "123", 10)}};
  ToDisk.Mode = InstructionBenchmark::Latency;
  ToDisk.CpuName = "cpu_name";
  ToDisk.LLVMTriple = "llvm_triple";
  ToDisk.NumRepetitions = 1;
  ToDisk.Measurements.push_back(BenchmarkMeasure{"a", 1, 1});
  ToDisk.Measurements.push_back(BenchmarkMeasure{"b", 2, 2});
  ToDisk.Error = "error";
  ToDisk.Info = "info";

  SmallString<64> Filename;
  std::error_code EC;
  EC = sys::fs::createUniqueDirectory("BenchmarkResultTestDir", Filename);
  ASSERT_FALSE(EC);
  sys::path::append(Filename, "data.yaml");
  errs() << Filename << "-------\n";
  ExitOnErr(ToDisk.writeYaml(State, Filename));

  {
    // One-element version.
    const auto FromDisk =
        ExitOnErr(InstructionBenchmark::readYaml(State, Filename));

    EXPECT_THAT(FromDisk.Key.Instructions,
                Pointwise(EqMCInst(), ToDisk.Key.Instructions));
    EXPECT_EQ(FromDisk.Key.Config, ToDisk.Key.Config);
    EXPECT_EQ(FromDisk.Mode, ToDisk.Mode);
    EXPECT_EQ(FromDisk.CpuName, ToDisk.CpuName);
    EXPECT_EQ(FromDisk.LLVMTriple, ToDisk.LLVMTriple);
    EXPECT_EQ(FromDisk.NumRepetitions, ToDisk.NumRepetitions);
    EXPECT_THAT(FromDisk.Measurements, ToDisk.Measurements);
    EXPECT_THAT(FromDisk.Error, ToDisk.Error);
    EXPECT_EQ(FromDisk.Info, ToDisk.Info);
  }
  {
    // Vector version.
    const auto FromDiskVector =
        ExitOnErr(InstructionBenchmark::readYamls(State, Filename));
    ASSERT_EQ(FromDiskVector.size(), size_t{1});
    const auto FromDisk = FromDiskVector[0];
    EXPECT_THAT(FromDisk.Key.Instructions,
                Pointwise(EqMCInst(), ToDisk.Key.Instructions));
    EXPECT_EQ(FromDisk.Key.Config, ToDisk.Key.Config);
    EXPECT_EQ(FromDisk.Mode, ToDisk.Mode);
    EXPECT_EQ(FromDisk.CpuName, ToDisk.CpuName);
    EXPECT_EQ(FromDisk.LLVMTriple, ToDisk.LLVMTriple);
    EXPECT_EQ(FromDisk.NumRepetitions, ToDisk.NumRepetitions);
    EXPECT_THAT(FromDisk.Measurements, ToDisk.Measurements);
    EXPECT_THAT(FromDisk.Error, ToDisk.Error);
    EXPECT_EQ(FromDisk.Info, ToDisk.Info);
  }
}

TEST(BenchmarkResultTest, PerInstructionStats) {
  PerInstructionStats Stats;
  Stats.push(BenchmarkMeasure{"a", 0.5, 0.0});
  Stats.push(BenchmarkMeasure{"a", 1.5, 0.0});
  Stats.push(BenchmarkMeasure{"a", -1.0, 0.0});
  Stats.push(BenchmarkMeasure{"a", 0.0, 0.0});
  EXPECT_EQ(Stats.min(), -1.0);
  EXPECT_EQ(Stats.max(), 1.5);
  EXPECT_EQ(Stats.avg(), 0.25); // (0.5+1.5-1.0+0.0) / 4
}
} // namespace
} // namespace exegesis
} // namespace llvm