Richard Shaw writes:

I'm having trouble determining what the base CPU targets for Fedora can accommodate.


For example, ss it safe to assume AVX2 on x86_64? 

Nope.

Linux thinkpad 5.5.16-200.fc31.x86_64 #1 SMP Wed Apr 8 16:43:33 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
[
/proc/cpuinfo:

flags : ... avx ... Last year a proposal was floated to require avx2 for Fedora 3-something. It didn't go well.

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