If you can recompile but the code was written to only target AVX-512 you can use https://github.com/simd-everywhere/simde to near effortlessly map the intrinsics to AVX2 (or lower).

Recompiling is not an option? Also seems weird that the binary only ships with a AVX512 codepath and not AVX2 as well.

I remember there being also an issue of linked MKL libraries shipped with various software (e.g. Matlab) not using the appropriate AVX2 codepaths on 'unsupported' AMD processors and isn't was falling back on slow non vectorized code.

I think the key issue here is the use of the intel compiler on a non intel product. Can you not recompile your code with GCC or LLVM? are the performance metrics that bad that they are not options? AMD has made the system... Engineer your solution if you want to use it :)

What's the workload if you don't mind me asking? Presumably the difference isn't just down to the smaller width of AVX2 but new instructions in the AVX-512 family?

compile it for avx2 and you might still win