[Bug 89058] [SKL]Render error in some games (etqw-demo, nexuiz, portal)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89058

--- Comment #23 from Matt Turner <mattst88 at gmail.com> ---
(In reply to Neil Roberts from comment #22)
> I think I have isolated the ARBvp program that is being used to render a
> part of the gun that's getting corrupted. I can send it if someone requests
> it.
> 
> An unusual thing I can see with the compiled program is that it ends up
> doing a send instruction with the same src and dst register. The send
> instruction is to do a constant load. At a glance I can't find anything to
> say whether it's acceptable to do a send with overlapping src and dst so I
> don't know whether that's really a problem. However if I enable the trivial
> allocator it no longer does this and the rendering error is fixed.
> 
> I don't know the register allocator well enough to know whether it would
> normally try to avoid allocating the src and dst registers to the same
> number. The constant load gets the message header added via my patch in
> commit 5a06ee7384934f8 so it might be that I've done something to mess it up.

Yes, IIRC there's a restriction on some newer platforms that send's source and
dest cannot overlap. Let me see if I can find that text in the bspec again.

-- 
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/20150319/2ac3bccc/attachment.html>