[Mesa-dev] [Bug 111141] [REGRESSION] [BISECTED] [DXVK] 1-bit booleans and Elite Dangerous shader mis-optimization

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111141

--- Comment #20 from Steven Newbury <s_j_newbury at yahoo.co.uk> ---
(In reply to Jason Ekstrand from comment #10)
> The undefined values appear harmless so I'm going to guess that this is
> probably actually a RADV bug.  Not knowing too much about RADV, how I'd go
> aboug debugging it next would be to try "bisecting" nir_opt_algebraic.py by
> commenting out large chunks of it and seeing if you can narrow down which
> optimization triggers the problem.  Fortunately, with a renderdoc trace,
> it's pretty quick to test out changes (before/after shouldn't matter for the
> renderdoc capture in this case) so it shouldn't take a terribly long time. 
> Once you've figured out which optimization is the culpret, we can see if
> that optimization is buggy for some reason.  If the NIR optimization looks
> sound, you can try dumping the shaders out of RADV (again, I have no idea
> how to do that), diff them, and see if you can figure out why it's a problem.
> 
> For the moment, I'm going to move it over to RADV so that those people get
> notified.



Commenting out the bcsel at 32 optimizations makes it work.

I'll try enabling each one now...

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