[Bug 86469] Unreal Engine demo doesn't run

[bugzilla-daemon at freedesktop.org]

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

--- Comment #3 from Matt Turner <mattst88 at gmail.com> ---
(In reply to Tapani Pälli from comment #2)
> (In reply to Kenneth Graunke from comment #1)
> > This should actually be pretty easy to fix.  Sandybridge has more than 16
> > MRFs, so we could just adjust the spilling code to use the higher numbered
> > ones which aren't used for anything else.
> > 
> > The check also seems a bit heavy handed...it may not actually conflict...
> 
> I've checked that Effects works on SNB by simply setting spill_base_mrf 15
> (as 14 is used). I did not find documentation that would indicate more than
> 16 MRFs available though. Docs indicate there are 16 from which 1 .. 15 can
> be used.

SNB PRM Vol4 Part2's "Table 5-4. MRF Registers Available in Device Hardware"
says "Number per Thread" - "24 registers"

This would be an easy experiment for someone with a Sandybridge -- modify the
fs_visitor::spill_reg() function in
src/mesa/drivers/dri/i965/brw_fs_reg_allocate.cpp

-- 
You are receiving this mail because:
You are the QA Contact for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.freedesktop.org/archives/intel-3d-bugs/attachments/20150307/f6916d15/attachment-0001.html>