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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - Unreal Engine demo doesn't run"
href="https://bugs.freedesktop.org/show_bug.cgi?id=86469#c15">Comment # 15</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - Unreal Engine demo doesn't run"
href="https://bugs.freedesktop.org/show_bug.cgi?id=86469">bug 86469</a>
from <span class="vcard"><a class="email" href="mailto:itoral@igalia.com" title="Iago Toral <itoral@igalia.com>"> <span class="fn">Iago Toral</span></a>
</span></b>
<pre>(In reply to Matt Turner from <a href="show_bug.cgi?id=86469#c10">comment #10</a>)
<span class="quote">> (In reply to Tapani Pälli from <a href="show_bug.cgi?id=86469#c8">comment #8</a>)
> > 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
>
> I still don't think you're understanding what I'm saying. The statement
> you're referring to says
>
> > Regardless of actual hardware implementation, the thread should not assume that MRF addresses above m15 wrap to legal MRF registers.
>
> My point is that you cannot draw any conclusions about MRF > 15 from a page
> that claims they do not exist.</span >
(In reply to Matt Turner from <a href="show_bug.cgi?id=86469#c7">comment #7</a>)
<span class="quote">> (In reply to Tapani Pälli from <a href="show_bug.cgi?id=86469#c6">comment #6</a>)
> > 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.</span >
FWIW, I've sent a RFC series to the mailing list that implements this test:
<a href="http://lists.freedesktop.org/archives/mesa-dev/2015-September/094584.html">http://lists.freedesktop.org/archives/mesa-dev/2015-September/094584.html</a>
Spoiler alert: SNB supports 24 MRF registers</pre>
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