this post was submitted on 13 Feb 2024
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That's pretty much exactly how it works already. You compile with
-march=x86-64-v4and it'll use SSE and AVX all over the place.glibc does the runtime thing, but only once on application startup where the dynamic linker will link the version of the function optimized for your CPU. But it's a manual process on glibc's part, the variants are written by hand.
Not every project cares enough to do it dynamically like that and it would be a nightmare that way.
The fallback is, recompile with
-march=x86-64which will only use the base set of instructions. Or-march=i486if you want to run on absolutely ancient hardware.