Function BenchmarkBitRunReader

cpp/src/arrow/util/bit_util_benchmark.cc:221–238

template <typename BitRunReaderType>
static void BenchmarkBitRunReader(benchmark::State& state, int64_t set_percentage) {
  constexpr int64_t kNumBits = 4096;
  auto buffer = CreateRandomBitsBuffer(kNumBits, set_percentage);

  for (auto _ : state) {
    {
      BitRunReaderType reader(buffer->data(), 0, kNumBits);
      int64_t set_total = 0;
      internal::BitRun br;
      do {
        br = reader.NextRun();
        set_total += br.set ? br.length : 0;
      } while (br.length != 0);
      benchmark::DoNotOptimize(set_total);
    }
  }
  state.SetBytesProcessed(state.iterations() * (kNumBits / 8));
}

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