[Mesa-dev] swrast gallium provider doesn't work on Solaris SPARC (Mesa 20 with LLVM 10)

Roland Scheidegger sroland at vmware.com
Wed May 20 19:14:31 UTC 2020

Oh I missed that sparc is big endian.
Still not sure where the llvm IR would differ but indeed some different
unpacking somewhere could explain things.
(And I'd guess we'd get issues reported for other big endian archs soon
enough too...)


Am 19.05.20 um 22:00 schrieb Adam Jackson:
> On Wed, 2020-05-13 at 18:27 +0200, Petr Sumbera wrote:
>> Hi,
>> I have difficulties with Mesa update from version Mesa 18 (LLVM 6) where 
>> it used to work.
>> Now with Mesa 20 and LLVM 10 glxgears doesn't show wheels but just some 
>> random rectangles. Please see attached picture.
>> Any idea what could be possibly wrong?
> You have the misfortune to be using a big-endian CPU, and that
> corruption looks quite a lot like the vertex processing stage getting
> channel order wrong. Since the internals of both TGSI and NIR ought to
> be endian-indifferent, I suspect the error would be at point where you
> acquire the vertex data from the app and need to do machine-specific
> unpacking, but that's just a guess. Dumping the IR generated by each
> should hopefully be instructive.
> It might also be worth trying to build Mesa 20 against LLVM 6 to see if
> that points to anything in LLVM, but that's probably a bit less likely.
> - ajax
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