[Mesa-dev] [Bug 100613] Regression in Mesa 17 on s390x (zSystems)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100613

--- Comment #24 from Ray Strode <halfline at gmail.com> ---
(mid-air collision)

(In reply to Roland Scheidegger from comment #22)
> I think this has more to do with packed formats - for things like 10/10/10/2
> you can't really access that as multiple individual bytes.
Ah, yea, actually if I scroll down a little in the editor I see it gives an
example of each case (8/24 for the first case, and 5/5/5/1 for the second
case).

> Maybe the logic should be simplified for soa fetch for big-endian (e.g.
> always use scalars or vectors). Whatever works (well ideally you'd use what
> generates better code but I have no idea there on big endian or specifically
> ppc boxes.)
Yea, I guess thinking about it more, even if we can get scalar fetch to work
with sufficient twiddling, that twiddling probably introduces extra operations
per element, so maybe not a good idea.  I guess we should take another crack at
attachment 131000 first.

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