Mesa (master): nir: Recognize mul(b2f(a), b2f(b)) as a logical AND.
Matt Turner
mattst88 at kemper.freedesktop.org
Tue Mar 24 21:45:16 UTC 2015
Module: Mesa
Branch: master
Commit: c31158d2cb06a864cf44d6d4f2c539e359990d3d
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=c31158d2cb06a864cf44d6d4f2c539e359990d3d
Author: Matt Turner <mattst88 at gmail.com>
Date: Tue Mar 17 23:30:32 2015 -0700
nir: Recognize mul(b2f(a), b2f(b)) as a logical AND.
Transform this into b2f(and(a, b)).
total instructions in shared programs: 6205448 -> 6204391 (-0.02%)
instructions in affected programs: 284030 -> 282973 (-0.37%)
helped: 903
HURT: 6
Acked-by: Ian Romanick <ian.d.romanick at intel.com>
Reviewed-by: Connor Abbott <cwabbott0 at gmail.com>
---
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 ef855aa..f956edf 100644
--- a/src/glsl/nir/nir_opt_algebraic.py
+++ b/src/glsl/nir/nir_opt_algebraic.py
@@ -95,6 +95,8 @@ optimizations = [
(('fsat', a), ('fmin', ('fmax', a, 0.0), 1.0), 'options->lower_fsat'),
(('fsat', ('fsat', a)), ('fsat', a)),
(('fmin', ('fmax', ('fmin', ('fmax', a, 0.0), 1.0), 0.0), 1.0), ('fmin', ('fmax', a, 0.0), 1.0)),
+ # Emulating booleans
+ (('fmul', ('b2f', a), ('b2f', b)), ('b2f', ('iand', a, b))),
# Comparison with the same args. Note that these are not done for
# the float versions because NaN always returns false on float
# inequalities.
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