Function BenchmarkGenerateBits

cpp/src/arrow/util/bit_util_benchmark.cc:317–336

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

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

  while (state.KeepRunning()) {
    int64_t pattern_index = 0;
    const auto generate = [&]() -> bool {
      bool b = pattern[pattern_index++];
      if (pattern_index == sizeof(pattern) / sizeof(bool)) {
        pattern_index = 0;
      }
      return b;
    };
    GenerateBitsFunctorType()(bitmap, 0, num_bits, generate);
    benchmark::ClobberMemory();
  }
  state.SetBytesProcessed(state.iterations() * nbytes);
}

static void BitmapReader(benchmark::State& state) {
  BenchmarkBitmapReader<internal::BitmapReader>(state, state.range(0));