On Mon, 2019-07-22 at 14:51 -0400, Ben Cotton wrote:
After preliminary discussions with CPU vendors, we propose AVX2 as
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].
This is not what I'd call a good idea. I've had to shoot it down
several times on internal mailing lists for RHEL, I think it's even
less a good idea for Fedora.
Skylake Pentium and Celeron models - dating from 2015 - don't have AVX
at all. Why do we want to break them? Has Intel promised they're not
going to pull a trick like that again?
If we really want to chase after Clear Linux benchmarks then fix ld.so
to know that avx2 is a capability (like we could for i686 + sse2).
Moving the baseline like this is far, far too aggressive.