topic Potential bug in complex versions of mkl_?omatadd in Intel® oneAPI Math Kernel Library

Potential bug in complex versions of mkl_?omatadd

AC_Simon33 — Tue, 20 Oct 2020 11:45:13 GMT

Hi all,

I think came upon a bug in the mkl_?omatadd routine, especially the complex versions. If both matrices A and B are conjugate transposed, the matrix A is only conjugated. I configured the zomatadd.c example file that intel provided in order to show that this is the case:

As you can see the results are the same, which is incorrect. The second computation gives the wrong answer.

There are actually two more cases I found, where the result is wrong:

A transposed and B conjugated: This combination conjugate transposes A instead of just transposing it.
A conjugated and B transposed: This combination conjugate transposes B instead of just transposing it.

The example file is also attached for you to test it.

Best regards,

Simon

Re:Potential bug in complex versions of mkl_?omatadd

Gennady_F_Intel — Tue, 20 Oct 2020 13:35:17 GMT

what version of mkl do you use?

Re: Re:Potential bug in complex versions of mkl_?omatadd

AC_Simon33 — Tue, 20 Oct 2020 14:13:49 GMT

I'm using the mkl that comes with 2020 update 2 parallel studio. I'm on MacOS.

Re:Potential bug in complex versions of mkl_?omatadd

Gennady_F_Intel — Wed, 21 Oct 2020 07:15:06 GMT

Yes, you are right, that's the issue. You may escalate the case to Intel Online Service Center against Intel MKL.

Re: Re:Potential bug in complex versions of mkl_?omatadd

AC_Simon33 — Wed, 21 Oct 2020 11:07:19 GMT

Thanks for confirming the issue. There was already a ticket created by Khoros, is that enough?

Re:Potential bug in complex versions of mkl_?omatadd

Gennady_F_Intel — Mon, 05 Apr 2021 03:16:55 GMT

the fix of the issue has been released in the latest oneMKL 2021.2 which available for download.

Re:Potential bug in complex versions of mkl_?omatadd

Gennady_F_Intel — Mon, 05 Apr 2021 03:17:16 GMT

The issue is closing and we will no longer respond to this thread. If you require additional assistance from Intel, please start a new thread. Any further interaction in this thread will be considered community only.