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Portable multi-versioning is kind of hard to set up. E.g. compilers on Linux are not happy to emit AVX512 intrinsics when the architecture isn't enabled via -m... - this is also true for the case where you're trying to setup a dispatching system relying on cpuid, etc.


Is this specific to AVX512? It works well for e.g. AVX2.


Yes, at least on AVX512 the compiler will throw a fit on trying to use intrinsics in case you haven't enabled TU-global architecture with options.


Seems to work fine for me: https://gcc.godbolt.org/z/hPexshjoa


Likely a different compiler/version. GCC had this error for me recently:

error: inlining failed in call to 'always_inline' 'float _mm512_reduce_add_ps(__m512)': target specific option mismatch


Compiler Explorer link or it didn't happen? :-)




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