Function BitBlockCounterBench

cpp/src/arrow/util/bitmap_reader_benchmark.cc:52–76

}

static void BitBlockCounterBench(benchmark::State& state) {
  int64_t nbytes = state.range(0);
  std::shared_ptr<Buffer> cond_buf = CreateRandomBuffer(nbytes);
  for (auto _ : state) {
    BitBlockCounter counter(cond_buf->data(), 0, nbytes * 8);

    int64_t offset = 0;
    uint64_t set_bits = 0;

    while (offset < nbytes * 8) {
      const BitBlockCount& word = counter.NextWord();
      //      if (word.AllSet()) {
      //        set_bits += word.length;
      //      } else if (word.popcount) {
      //        set_bits += word.popcount;
      //      }
      set_bits += word.popcount;
      benchmark::DoNotOptimize(set_bits);
      offset += word.length;
    }
    benchmark::ClobberMemory();
  }

  state.SetBytesProcessed(state.iterations() * nbytes);
}

static void BitmapWordReaderBench(benchmark::State& state) {
  int64_t nbytes = state.range(0);