Function CheckedLog2

tensorflow/lite/kernels/internal/quantization_util.cc:373–383

}

bool CheckedLog2(const float x, int* log2_result) {
  // Using TfLiteRound instead of std::round and std::log instead of
  // std::log2 to work around these fuctions being missing in a toolchain
  // used in some TensorFlow tests as of May 2018.
  const float x_log2 = std::log(x) * (1.0f / std::log(2.0f));
  const float x_log2_rounded = TfLiteRound(x_log2);
  const float x_log2_fracpart = x_log2 - x_log2_rounded;

  *log2_result = static_cast<int>(x_log2_rounded);
  return std::abs(x_log2_fracpart) < 1e-3;
}

void QuantizeMultiplierArray(const double* effective_scales, size_t size,
                             int32_t* effective_scale_significand,