On 06/18/2018 07:05 PM, Kevin Kofler wrote: > Jeff Backus wrote: >> Hmm.. Yes, we've had discussions within the SIG re: window managers that >> support i586/i686, and KDE was on the list of WMs that no longer support >> our target system. Do these patches/hacks only apply to KDE or do they >> apply to Qt in general? > > The absolute worst is QtWebEngine. Chromium dropped support for non-SSE2 x86 > years ago, so I had to cumulatively revert a whole bunch of commits that > removed runtime SSE2 detection where it was present and added some more > unconditional SSE2 optimizations. And now V8 (the JavaScript engine that > Chromium relies on) dropped the x87 backend (i.e., the one using x87 rather > than SSE2 for floating-point operations, hence working on non-SSE2 x86 > machines) for their JIT entirely (and there is no interpreter-only > fallback), so I am even stuck trying to port the x87 backend to each new Qt > branch (which uses a newer Chromium and thus a newer V8). This is a huge > effort, and nobody outside of Fedora cares about non-SSE2 anymore. Even > distros that claim to support non-SSE2 hardware just ship QtWebEngine as > SSE2 only. I haven't seen any other distro even picking up my patch, let > alone working on it. The Fedora Chromium, V8 and Node.js packagers also do > not care. I suspect Firefox may also be sse2-only, at least indirectly from Rust. I just checked the rustc target spec for i686-unknown-linux-gnu, and by default it's targeting "pentium4". There is an i585-unknown-linux-gnu which targets only "pentium" though. But Firefox has been building with Rust on all arches for over a year now, and apparently, nobody has noticed this in practice... _______________________________________________ devel mailing list -- devel@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to devel-leave@xxxxxxxxxxxxxxxxxxxxxxx Fedora Code of Conduct: https://getfedora.org/code-of-conduct.html List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/devel@xxxxxxxxxxxxxxxxxxxxxxx/message/WS35Z4BIHKXJX6TJSZT5EHOIJFAMYUIL/
