On Mon, Jul 22, 2019 at 8:52 PM Ben Cotton <bcotton@redhat.com> wrote:

= Detailed Description ==

After preliminary discussions with CPU vendors, we propose AVX2 as the
new baseline.  AVX2 support was introduced into CPUs from 2013 to
2015. See [https://en.wikipedia.org/wiki/Advanced_Vector_Extensions#CPUs_with_AVX2
CPUs with AVX2].

We have 3 test machines in Brno's Fedora QA office, none of which support AVX2. Both my parents run Fedora on their laptops, none of which support AVX2. My own desktop machine at home is on the borderline (Haswell).

I consider this proposal a complete no-go.

That said, I think it might be interesting to have a way for newer CPUs to make use of the new instructions, and people proposed ways to achieve that. But first, we should gather some performance numbers, whether it's worth it at all.