Function bytes_to_bits_avx2

cpp/src/arrow/compute/util_avx2.cc:187–194

}

void bytes_to_bits_avx2(const int num_bits, const uint8_t* bytes, uint8_t* bits) {
  constexpr int unroll = 32;
  // Processing 32 bits at a time
  for (int i = 0; i < num_bits / unroll; ++i) {
    reinterpret_cast<uint32_t*>(bits)[i] = _mm256_movemask_epi8(
        _mm256_loadu_si256(reinterpret_cast<const __m256i*>(bytes) + i));
  }
}

bool are_all_bytes_zero_avx2(const uint8_t* bytes, uint32_t num_bytes) {
  __m256i result_or = _mm256_setzero_si256();