Mesa (master): nir: Add a bunch of algebraic optimizations on logic/ bit operations.
Kenneth Graunke
kwg at kemper.freedesktop.org
Fri Jan 23 22:55:23 UTC 2015
Module: Mesa
Branch: master
Commit: 3e56572c498bea3c41692c80c242883373dab42a
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=3e56572c498bea3c41692c80c242883373dab42a
Author: Kenneth Graunke <kenneth at whitecape.org>
Date: Mon Jan 19 14:57:38 2015 -0800
nir: Add a bunch of algebraic optimizations on logic/bit operations.
Matt and I noticed a bunch of "val <- ior a a" operations in a shader,
so we decided to add an algebraic optimization for that. While there,
I decided to add a bunch more of them.
v2: Delete bogus fand/for optimizations (caught by Jason).
total NIR instructions in shared programs: 2023511 -> 2020814 (-0.13%)
NIR instructions in affected programs: 149634 -> 146937 (-1.80%)
helped: 1032
total i965 instructions in shared programs: 6035392 -> 6035397 (0.00%)
i965 instructions in affected programs: 537 -> 542 (0.93%)
HURT: 2
Signed-off-by: Kenneth Graunke <kenneth at whitecape.org>
Reviewed-by: Jason Ekstrand <jason.ekstrand at intel.com>
Reviewed-by: Matt Turner <mattst88 at gmail.com>
---
src/glsl/nir/nir_opt_algebraic.py | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/src/glsl/nir/nir_opt_algebraic.py b/src/glsl/nir/nir_opt_algebraic.py
index 169bb41..53fe4a0 100644
--- a/src/glsl/nir/nir_opt_algebraic.py
+++ b/src/glsl/nir/nir_opt_algebraic.py
@@ -68,6 +68,19 @@ optimizations = [
(('fadd', ('fmul', a, b), c), ('ffma', a, b, c)),
(('fge', ('fneg', ('fabs', a)), 0.0), ('feq', a, 0.0)),
(('fmin', ('fmax', a, 1.0), 0.0), ('fsat', a)),
+ # Logical and bit operations
+ (('fand', a, 0.0), 0.0),
+ (('iand', a, a), a),
+ (('iand', a, 0), 0),
+ (('ior', a, a), a),
+ (('ior', a, 0), a),
+ (('fxor', a, a), 0.0),
+ (('ixor', a, a), 0),
+ (('inot', ('inot', a)), a),
+ # DeMorgan's Laws
+ (('iand', ('inot', a), ('inot', b)), ('inot', ('ior', a, b))),
+ (('ior', ('inot', a), ('inot', b)), ('inot', ('iand', a, b))),
+
# This one may not be exact
(('feq', ('fadd', a, b), 0.0), ('feq', a, ('fneg', b))),
]
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