[Mesa-dev] [Bug 101338] Mesa software rendering draws incompletely on Raspberry Pi

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101338

--- Comment #4 from Roland Scheidegger <sroland at vmware.com> ---
The original Raspberry Pi IIRC doesn't even support NEON. Theoretically, llvm
should still support all the vector instructions by decomposing them into
scalar ones, but if that really works correctly? I know it didn't work some
time ago (at all) on x86, so I wouldn't be surprised if things get miscompiled
on arm neither.

(And Brian is right, llvmpipe isn't all that well tested on anything but x86.
In theory it should work alright at least on all little endian archs, though
you really want to have a cpu with vector instructions, otherwise it not only
will be slow but there's a whole another set of potential issues with llvm code
generation. Possibly a newer llvm version could help, albeit 3.9 isn't all that
old.)

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