Mesa (master): nir: Recognize open-coded fmin/fmax.
Matt Turner
mattst88 at kemper.freedesktop.org
Wed Feb 11 22:38:55 UTC 2015
Module: Mesa
Branch: master
Commit: 4c42e1116b552cca1ed667c20ae9ba966b580983
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=4c42e1116b552cca1ed667c20ae9ba966b580983
Author: Matt Turner <mattst88 at gmail.com>
Date: Tue Feb 10 21:43:32 2015 -0800
nir: Recognize open-coded fmin/fmax.
And unfortunately other shaders do the same thing but with >=/<= which
we can't apply this optimization to because of NaNs.
instructions in affected programs: 23309 -> 22938 (-1.59%)
Reviewed-by: Kenneth Graunke <kenneth at whitecape.org>
---
src/glsl/nir/nir_opt_algebraic.py | 2 ++
1 file changed, 2 insertions(+)
diff --git a/src/glsl/nir/nir_opt_algebraic.py b/src/glsl/nir/nir_opt_algebraic.py
index 2b4259e..83223f7 100644
--- a/src/glsl/nir/nir_opt_algebraic.py
+++ b/src/glsl/nir/nir_opt_algebraic.py
@@ -82,6 +82,8 @@ optimizations = [
(('feq', ('fadd', a, b), 0.0), ('feq', a, ('fneg', b))),
(('fne', ('fadd', a, b), 0.0), ('fne', a, ('fneg', b))),
(('fge', ('fneg', ('fabs', a)), 0.0), ('feq', a, 0.0)),
+ (('bcsel', ('flt', a, b), a, b), ('fmin', a, b)),
+ (('bcsel', ('flt', a, b), b, a), ('fmax', a, b)),
(('fmin', ('fmax', a, 0.0), 1.0), ('fsat', a)),
# Comparison with the same args. Note that these are not done for
# the float versions because NaN always returns false on float
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