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Constexpr in intrinsics?


Would it be possible to add constexpr to the intrinsics headers?

For instance _mm_set_XX and _mm_setzero intrinsics.

Ideally it could also be added all intrinsics that can be evaluated at compile 
time, but it is harder to tell which those are.

Does gcc have a C extension we can use to set constexpr?

Best regards
`Allan


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