Function BitmapEquals

cpp/src/arrow/util/bit_util_benchmark.cc:486–504

// Benchmark the worst case of comparing two identical bitmap
template <int64_t Offset = 0>
static void BitmapEquals(benchmark::State& state) {
  const int64_t buffer_size = state.range(0);
  const int64_t bits_size = buffer_size * 8;
  std::shared_ptr<Buffer> buffer = CreateRandomBuffer(buffer_size);

  const uint8_t* src = buffer->data();
  const int64_t offset = Offset;
  const int64_t length = bits_size - offset;

  auto copy = *AllocateEmptyBitmap(length + offset);
  internal::CopyBitmap(src, 0, length, copy->mutable_data(), offset);

  for (auto _ : state) {
    auto is_same = internal::BitmapEquals(src, 0, copy->data(), offset, length);
    benchmark::DoNotOptimize(is_same);
  }

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

static void BitmapEqualsWithoutOffset(benchmark::State& state) { BitmapEquals<0>(state); }