Hi, On Fri, 31 May 2024, Paolo Bonzini wrote:
> x86-64-v2 processors were released in 2008, assume that we have one. > This provides CMOV on 32-bit processors, and also POPCNT and various > vector ISA extensions. If my contributions to recent cleanups and speedups for buffer_is_zero count for something, I'd like to ask you to reconsider. I do not see what distribution maintainers (where there's no distro-wide switch to x86_64-v2 baseline happening yet) are supposed to do with SIGILL reports coming from affected users after this change. I'm sure it's not "here's a nickel, kid...", but I'm honestly at a loss what you'd suggest. Looking at the patches, the gains appear to be so remarkably tiny, with the exception of adding CMOV to baseline, that I question if it's worth the friction. Is there something I'm not seeing? I think basing the decision on when the earliest x86_64-v2 processors appeared is not right. Would you consider a reversal of the three patches that bump the baseline beyond SSE2? > meson: assume x86-64-v2 baseline ISA > host/i386: assume presence of SSSE3 > host/i386: assume presence of POPCNT Thank you. Alexander
