[Bug 86469] Unreal Engine demo doesn't run

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=86469

--- Comment #8 from Tapani Pälli <lemody at gmail.com> ---
(In reply to Matt Turner from comment #7)
> (In reply to Tapani Pälli from comment #6)
> > SNB bspec, EU Overview -> Messages -> Message Register File (MRF), last
> > paragraph.
> 
> That page doesn't say "it's not safe". If anything it says MRFs > 15 don't
> exist ("There are 16 MRF registers").
> 
> It wouldn't surprise me if the registers don't exist and the "24" is a
> mistake, but it also wouldn't surprise me if SNB actually has 24 MRFs and
> they just didn't update a bunch of documentation. Experimentation is the
> only way to be sure.

I dont have access right now but the last clause is something like "regardless
of the actual hw implementation thread should not assume registers above 16 can
be used" but yep, one can experiment

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