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nir: Add a bunch of algebraic optimizations on logic/bit operations.

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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@whitecape.org>
Reviewed-by: Jason Ekstrand <jason.ekstrand@intel.com>
Reviewed-by: Matt Turner <mattst88@gmail.com>
This commit is contained in:
Kenneth Graunke 2015-01-19 14:57:38 -08:00
parent 978b0a9cda
commit 3e56572c49
1 changed files with 13 additions and 0 deletions
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13
src/glsl/nir/nir_opt_algebraic.py
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@ -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))),
]