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Multi-threading support missing for ippiCrossCorrNorm_32f_C1R (Version 2019 Update 5)

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I recently made a very late upgrade from IPP 6.1 to IPP 2019.5.281. I found out that the cross correlation API has gotten significantly slower compared to IPP 6.1, from 2-3ms to 5-6ms per run. I checked the ThreadedFunctionsList.txt for the IPP version 2019.5.281 and it appears that the cross correlation API no longer has multi-threading support. This is not a matter of not having threaded libraries installed; I have tested both the single and threaded libraries. Threading actually makes the API slower, 8-9ms.

Has internal multi-threading support really been removed from the cross correlation API? If so, what is the justification? Cross-correlation is a very widely used function, so it seems like an odd decision to make.

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TCE Open Date: 

Tuesday, February 4, 2020 - 06:30

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