STINNER Victor <[email protected]> added the comment:
> AFAIK gcc does not enable SSE3 and SSE4 on X86_64 by default.
Linux now supports multiple variants of the same function, one variant per CPU
type, the binding is done when a library is loaded. But I don't know how to
implement that :-(
There is target_clones("sse4.1,avx") the function attribute in GCC for example.
It compiles a function twice, once for generic CPU, once for SSE4.1.
See also ifunc: "indirect function", "CPU dispatch" or "function resolver".
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nosy: +haypo
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