* Andy Lutomirski <l...@amacapital.net> wrote:
> On Mon, Aug 17, 2015 at 1:01 AM, Ingo Molnar <mi...@kernel.org> wrote:
>
> > So when I re-introduced static allocations math-emu started working again,
> > to
> > a limited degree: on a modern distro, trying to boot /bin/bash I got a
> > prompt,
> > but various programs would segfault. I did not investigate it any deeper, I
> > suppose the FPU emulation does not go far enough for modern user-space, or
> > maybe it has more bugs.
>
> Were you testing with just no387 or did you run a VM with SSE2 and such
> turned
> off?
>
> There's a *lot* of userspace that incorrectly checks for instructions without
> checking for the state support. I've filed bugs against libgcc for this and
> they're still not fixed IIRC.
I tested relatively ancient user-space, 2007 era Fedora Core 6 - but I didn't
check whether it's truly SSE-less (it probably isn't).
Thanks,
Ingo
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