[Bug 99919] Wrong and unstable image rendering from GLSL fragment shaders

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99919

--- Comment #10 from Hugues Evrard <h.evrard at imperial.ac.uk> ---
(In reply to Matt Turner from comment #9)
> 
> [...], and the same change to variant.frag "fixes" its output to match
> original.frag.

Thanks for the analysis indeed!

This bug report comes from experiments on fuzzing shaders to chase bugs in
graphics drivers. Unfortunately here the original shader that we fuzzed exposes
undefined behavior in opU() as explained by Roland, we didn't spot that
earlier.

I'll try to confirm the fix suggested by Matt on our setup, but I'm currently
travelling so it may take a few days.

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