On Wed, Jun 16, 2021 at 6:08 PM Kevin Kofler via devel <devel@lists.fedoraproject.org> wrote: > > Neal Gompa wrote: > > Yeah, I think that proposal was not workable because of AVX2. The > > x86_64-v2 subarch adds SSSE3, SSE4.2, POPCNT, and CMPXCHG16B to the > > current x86_64 baseline. All of these instructions were present in the > > first Intel Macs launched in 2007, as I recall. > > Still means my Core 2 Duo notebook would no longer be able to run Fedora. > > >> Different question: How is the runtime CPU feature detection / > >> dispatch support in glibc coming along? Shouldn't this "work" by now? > > > > No idea, good question, though! > > Indeed, runtime detection is clearly the way to go. > > Why does this proposal to desupport hardware for no good reason (because the > performance gain can be obtained in a compatible way, where it is even > noticeable at all) keep coming up again and again? >
It keeps coming up because we don't have support for subarches in RPM for anything but ARM architectures. That deficiency forces us to keep considering raising the baseline instead of being able to have select packages with subarch content. This is important because not everything *can* use glibc-hwcap hardware detection at runtime, and sometimes you need optimized binaries. -- 真実はいつも一つ！/ Always, there's only one truth! _______________________________________________ devel mailing list -- devel@lists.fedoraproject.org To unsubscribe send an email to devel-le...@lists.fedoraproject.org Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/devel@lists.fedoraproject.org Do not reply to spam on the list, report it: https://pagure.io/fedora-infrastructure
