On 2016-02-03 14:23, Henri Sivonen wrote:
As for the consequences of requiring SSE2 unconditionally, I'm
personally more worried about a conflict with Linux distros that don't
already require SSE2 (even if near 100% of their users actually had
SSE2-enabled hardware; this concern is not about the actual numbers)
than about dropping support for XP boxes. Curiously, Fedora seems to
document that llvmpipe requires SSE2 as if the distro as a whole
didn't. I wonder if there actually exist non-SSE2 boxes with
Gnome3-compatible OpenGL on the GPU. Ubuntu also relies on llvmpipe in
the absence of suitable GPU-base OpenGL support. This suggests that
the major distros are de facto pretty far along requiring SSE2, but I
don't know what their policies are and how unhappy they'd be about
Firefox requiring SSE2 (or how unhappy we'd be if distros shipped
de-optimized Firefox and users thought it works the same as the one
from Mozilla).
As far as I know in Debian i386 just changed it's default from i586 to
i686 (+ cmov?):
https://lists.debian.org/debian-devel/2015/09/msg00589.html
There are some packages that do unconditionally use things like sse2,
but they're usually specialized and you wouldn't run it on old hardware.
I have no idea what the situation with things like llvmpipe is.
Kurt
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