MKL DftiComputeBackwards with DFTI_NUMBER_OF_TRANSFORMS > 1 can produce different results

[swalker]

I have a testcase that demonstrates DftiComputeBackwards producing slightly different results when calling in a loop vs setting DFTI_NUMBER_OF_TRANSFORMS to do multiple transforms in 1 pass. This is causing unexpected results for our use of MKL. For some reason the problem disappears when AVX512 mode is enabled. See reproducer testcase for details.

[VarshaS_Intel]

Hi,

Thanks for posting in Intel Communities.

Based on this, and our discussion about creating a priority ticket if needed, I am going ahead and closing this case for now.

Please feel free to contact us further if you need any assistance from our side. 

Thanks & Regards,

Varsha