Function BenchmarkBitmapReader

cpp/src/arrow/util/bit_util_benchmark.cc:191–218

template <typename BitmapReaderType>
static void BenchmarkBitmapReader(benchmark::State& state, int64_t nbytes) {
  std::shared_ptr<Buffer> buffer = CreateRandomBuffer(nbytes);

  const int64_t num_bits = nbytes * 8;
  const uint8_t* bitmap = buffer->data();

  for (auto _ : state) {
    {
      BitmapReaderType reader(bitmap, 0, num_bits);
      int64_t total = 0;
      for (int64_t i = 0; i < num_bits; i++) {
        total += reader.IsSet();
        reader.Next();
      }
      benchmark::DoNotOptimize(total);
    }
    {
      BitmapReaderType reader(bitmap, 0, num_bits);
      int64_t total = 0;
      for (int64_t i = 0; i < num_bits; i++) {
        total += !reader.IsNotSet();
        reader.Next();
      }
      benchmark::DoNotOptimize(total);
    }
  }
  state.SetBytesProcessed(2LL * state.iterations() * nbytes);
}

template <typename BitRunReaderType>
static void BenchmarkBitRunReader(benchmark::State& state, int64_t set_percentage) {