Intel® oneAPI Math Kernel Library
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Difference between and


What is the actual difference between and Moreover, How to do you which SSE version is linked to

When I force the code to use SSE4.1, by this command. mkl_cbwr_set(MKL_CBWR_SSE4_1). Then is being used and the performance is better. But if I don't force it, the code simply uses and the performance is bad.

Can anyone explain me what actually the difference is?

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189 Views supports SSE4.2 instruction set - for example for Nehalem microarchitecture but supports SSE4.1. 

Do you know the CPU type are you running your code?