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Add detection of function multi-versioning in the compiler #234

Merged
merged 2 commits into from
Aug 7, 2023
Merged

Add detection of function multi-versioning in the compiler #234

merged 2 commits into from
Aug 7, 2023

Commits on Aug 7, 2023

  1. Add detection of function multi-versioning in the compiler 

    This support is used so that the SSE2 version of memcpy_nontemporal is
selected only if the CPU supports SSE2 at runtime.

On x86-64 there is guaranteed to be runtime support, so this only
affects i386. Note that i386 is not currently tested. The real
motivation is that it lays the groundwork for adding more specialised
variants e.g. AVX, AVX-512, MOVDIR64B etc.
    @bmerry
    bmerry committed Aug 7, 2023
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  2. Adjust detection of function multi-versioning 

    Never use it on non-x86 architectures. This is a workaround for MacOS
universal binary Python builds, where detection happens on x86 but the
ARM branch of the build fails because it's not supported there.
    @bmerry
    bmerry committed Aug 7, 2023
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