[Bug 98578] AMDGPU white glitches in some games

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98578

--- Comment #8 from Nicolai Hähnle <nhaehnle at gmail.com> ---
This took a while to track down. There is a shader (source @9633678, linked
into program 1127) which relies on -inf * +F == -inf. LLVM transforms the
shader in such a way that the result becomes a NaN instead (visible at a single
pixel @ 953,0 in the final frame of the trimmed trace at @14722003), which then
propagates to an ugly white square in post-processing. The LLVM transform is
simply incorrect and fixed by https://reviews.llvm.org/D26602.

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