[Mesa-dev] [PATCH 3/3] i965/fs: Recognize and emit ld_lz, sample_lz, sample_c_lz.

[Kenneth Graunke]

On Wednesday, May 4, 2016 3:54:14 PM PDT Matt Turner wrote:
> Ken suggested instead of a big and complicated optimization pass, to
> just recognize the operations here. It's certainly less code and a lot
> prettier, but it seems to actually perform worse for currently unknown
> reasons.

One potential pitfall is that is_zero() currently returns false for
-0.0f.  The fp64 series that's supposedly landing fixes this.
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