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You are right. You can find documentation for universal intriniscs here
Yes, you are right. Note that HAL replacement library is meant to be standalone static library and OpenCV should be rebuilt to use it. Also note that replacement interfaces are not fully stabilized and can be changed until release 3.2.
It was temporary solution, cv::hal::LU32f came from initial HAL variant. Please, take a look at the merged pull request 6535 - it has added calls to cv_hal_LU32fand cv_hal_LU64f along.
