[Bug 91022] [g45 g965 bisected] assertions generated from textureGrad cube samplers fix

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91022

--- Comment #2 from Iago Toral <itoral at igalia.com> ---
(In reply to Kenneth Graunke from comment #1)
> Created attachment 116584 [details] [review]
> Fix for the bug (untested)
> 
> My Gen4 SIMD16 texturing code was broken.  I've attached a patch which
> should fix it, but I haven't had access to my machine to piglit test it yet.
> 
> The tests still assert fail, but due to another existing bug with tile
> offsets.

Ugh, sorry about this... I don't have gen4 hardware available and never
imagined this could break older gens like this.

Since you have a patch for this and the driver still hits more problems down
the line I fear that my change is driving the gen4 code through paths that were
not ready for this. If it creates too much havoc for you we can always limit my
change to gen >= 5 while we figure out how to apply this to gen4.

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