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nir/algebraic: optimize contradictory iand operands

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Some of these were found in a few GTAV, Rise of the Tomb Raider and
Shadow of the Tomb Raider shaders.

Results from vkpipeline-db run with ACO:
Totals from affected shaders:
SGPRS: 376 -> 376 (0.00 %)
VGPRS: 220 -> 220 (0.00 %)
Spilled SGPRs: 0 -> 0 (0.00 %)
Spilled VGPRs: 0 -> 0 (0.00 %)
Private memory VGPRs: 0 -> 0 (0.00 %)
Scratch size: 0 -> 0 (0.00 %) dwords per thread
Code Size: 13492 -> 11560 (-14.32 %) bytes
LDS: 6 -> 6 (0.00 %) blocks
Max Waves: 69 -> 69 (0.00 %)
Wait states: 0 -> 0 (0.00 %)

v2: use False instead of 0

Signed-off-by: Rhys Perry <pendingchaos02@gmail.com>
Reveiewed-by: Alyssa Rosenzweig alyssa.rosenzweig@collabora.com
Reviewed-by: Connor Abbott <cwabbott0@gmail.com>
This commit is contained in:
Rhys Perry 2019-06-28 16:13:04 +01:00 • committed by Rhys Perry
parent 32ced14bad
commit 79801b9d7d
1 changed files with 6 additions and 0 deletions
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6
src/compiler/nir/nir_opt_algebraic.py
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@ -218,6 +218,12 @@ optimizations = [
(('inot', ('ieq', a, b)), ('ine', a, b)),
(('inot', ('ine', a, b)), ('ieq', a, b)),
(('iand', ('feq', a, b), ('fne', a, b)), False),
(('iand', ('flt', a, b), ('flt', b, a)), False),
(('iand', ('ieq', a, b), ('ine', a, b)), False),
(('iand', ('ilt', a, b), ('ilt', b, a)), False),
(('iand', ('ult', a, b), ('ult', b, a)), False),
# This helps some shaders because, after some optimizations, they end up
# with patterns like (-a < -b) || (b < a). In an ideal world, this sort of
# matching would be handled by CSE.