[Bug 94395] [ES3.1CTS,BDW,SKL,BSW,SKL,KBL] gpu_shader5 prevents GEN8+ from passing CTS

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94395

--- Comment #1 from Kenneth Graunke <kenneth at whitecape.org> ---
Here's a stab in the dark - we set nir_compiler_options::lower_ffma to true, to
try and allow for better CSE of MULs and ADDs.  But this causes ffmas that came
from the actual fma() GLSL built-in, where the point is increased precision, to
be split up as well.

We probably want to avoid *creating* new ffmas, but avoid *splitting* ones that
come in from GLSL IR.

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