[Bug 92033] [SNB, regression, dEQP, bisected] functional.shaders.random tests regressed

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Fri Sep 18 09:12:07 PDT 2015


--- Comment #2 from Antia Puentes <apuentes at igalia.com> ---
(In reply to Jason Ekstrand from comment #1)
> I'm pretty sure I know exactly what's going on here.  NIR has swizzles for
> all ALU instructions, but i965 can't swizzle some (maybe all?) math
> instructions.  The easiest fix would be to simply make emit_math emit an
> additional MOV if there is a non-trivial swizzle.  The reason this showed up
> as a regression is probably that we're doing better coalescing now than we
> were before.  The bug was present, we just weren't tickling it.  I'm
> re-assigning this to one of the Igalia people.

Thanks for the tip. I will be taking a look at this.

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