David Laight <David.Laight@xxxxxxxxxx> writes: > From: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx> >> Sent: 20 September 2024 16:44 >> >> Some distros switched gcc to '-march=x86-64-v3' by default and while it's >> hard to find a CPU which doesn't support it today, > > I didn't think that any of the Atom based cpu supported AVX. > I'm pretty sure one we use that are still in production as > server motherboards don't support it. > > Doesn't -v3 also require support for the VEX encoding. > Which removes a lot of perfectly reasonable cpu? > Well, distros making such decision are obviously not very interested in running on these CPUs then :-) In this particular case, the distro was Centos Stream 10 and they are very explicit about the decision: https://developers.redhat.com/articles/2024/01/02/exploring-x86-64-v3-red-hat-enterprise-linux-10#new_cpu_capabilities_in_x86_64_v3 and 'gcc -v' tells me Configured with: ../configure ... --with-arch_64=x86-64-v3 ... ... gcc version 14.2.1 20240801 (Red Hat 14.2.1-1) (GCC) -- Vitaly
