[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 #26 from Rob Clark <robclark at freedesktop.org> ---
(In reply to Ben Crocker from comment #25)
>
> Regarding Ray's specific comment about getting scalar fetch to work
> with "sufficient twiddling," I think it's perfectly acceptable to
> introduce extra operations, as long as we restrict the extra
> operations to the big-endian path.  PPC64 (LE or BE) is fast enough so
> that any performance impact will be negligible; S390 is less fast, but
> I imagine production machines with more memory than the one we
> experimented on here are fast enough.

drive-by comment.. unless llvm is just rubbish at optimization, I don't think
saving a few operations in the front-end IR building should be that important,
even for LE.  But we have shader-db so it should be possible to prove/disprove
that theory.  (Not sure if llvmpipe is instrumented for shader-db but if not
that should be easy to solve.)

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