[Bug 99221] >2% perf drop in GfxBench T-Rex with "i965: disable loop unrolling in GLSL IR"

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99221

--- Comment #16 from Timothy Arceri <t_arceri at yahoo.com.au> ---
(In reply to Eero Tamminen from comment #15)
> Yes, with that, the float loop is unrolled and PSPom perf regression is
> fixed.
> 

Cool. I've pushed that fix.

commit 4b7dfd881296a542a0c08a12c27f643dabd7280c
Author: Timothy Arceri <timothy.arceri at collabora.com>
Date:   Tue Jan 3 12:03:54 2017 +1100

    nir: fix loop iteration count calculation for floats

    Fixes performance regression in SynMark PSPom caused by loops with float
    counters not always unrolling.

    For example:

       for (float i = 0.02; i < 0.9; i += 0.11)
          ...

    Reviewed-by: Jason Ekstrand <jason at jlekstrand.net>

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