2017-10-01 23:10 GMT+02:00 Sylvestre Ledru <sylves...@debian.org>: > However, if I were, I would won't fix this bug. CPU without SSE2 are now > rare
Well, my ThinkPad T23 still works and despite the claims of some people, is still perfectly capable of browsing the web ;) > and the performance drop for not using SSE2 being enough that it should > remain enabled by default Sure, but if that's the case, I'd argue that the Debian Firefox package should instead drop all pretense of supporting pre-SSE2 CPUs and just be compiled with -msse2 throughout. As things stand, Debian does try to support pre-SSE2 CPUs, unlike the binaries provided by Mozilla themselves. > (AFAIK, this is done at build time, not at runtime). IIRC most of it is done at runtime (and you still need runtime checking for SSE3 and newer, AVX, etc anyway), and the checks are almost free in practice thanks to branch prediction.
