Norm type: L1
IPP versions: IPPICV (2017u3), standalone (2017u2, 2018u2 and others)

AVX2 code - failed
AVX512 code - failed too
SSE42 - passed

Reproducer (regression test): https://github.com/alalek/opencv/commits/ipp_norm_L1_16UC3_mask

modules/core/test/test_arithm.cpp:2102: Failure
      Expected: (double)20*cn
      Which is: 60
To be equal to: cv::norm(a, b, NORM_L1, mask)
      Which is: 6