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nir/opt_algebraic: optimize b2i(a) * b to bcsel

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Foz-DB Navi48:
Totals from 3180 (2.77% of 114655) affected shaders:
MaxWaves: 85526 -> 85446 (-0.09%)
Instrs: 2681446 -> 2678641 (-0.10%); split: -0.17%, +0.07%
CodeSize: 14295536 -> 14284628 (-0.08%); split: -0.13%, +0.05%
VGPRs: 174792 -> 174636 (-0.09%); split: -0.16%, +0.07%
SpillSGPRs: 306 -> 308 (+0.65%)
Latency: 14078973 -> 14070122 (-0.06%); split: -0.07%, +0.01%
InvThroughput: 2774242 -> 2764051 (-0.37%); split: -0.37%, +0.00%
VClause: 41744 -> 41734 (-0.02%); split: -0.10%, +0.07%
SClause: 58176 -> 58154 (-0.04%); split: -0.05%, +0.01%
Copies: 222967 -> 223108 (+0.06%); split: -0.14%, +0.20%
Branches: 57317 -> 57322 (+0.01%)
PreSGPRs: 140454 -> 140451 (-0.00%); split: -0.01%, +0.00%
PreVGPRs: 131649 -> 131540 (-0.08%); split: -0.09%, +0.01%
VALU: 1509318 -> 1505443 (-0.26%); split: -0.26%, +0.00%
SALU: 384419 -> 385838 (+0.37%); split: -0.01%, +0.38%
VOPD: 13272 -> 13286 (+0.11%); split: +0.14%, -0.03%

Reviewed-by: Daniel Schürmann <daniel@schuermann.dev>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/40160>
This commit is contained in:
Georg Lehmann 2025-02-27 16:14:52 +01:00 • committed by Marge Bot
parent 9f1a446107
commit 7194dfcc2c
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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@ -1596,6 +1596,12 @@ optimizations.extend([
(('ine', ('b2i', 'a@1'), ('ineg', ('b2i', 'b@1'))), ('ior', a, b)),
(('ieq', ('b2i', 'a@1'), ('ineg', ('b2i', 'b@1'))), ('inot', ('ior', a, b))),
(('imul', ('b2i', 'a@1'), b), ('bcsel', a, b, 0)),
(('imul', ('ineg', ('b2i', 'a@1')), b), ('ineg', ('bcsel', a, b, 0))),
(('ishl', ('b2i', 'a@1'), '#b'), ('bcsel', a, ('ishl', 1, b), 0)),
(('ishl', ('ineg', ('b2i', 'a@1')), '#b'), ('bcsel', a, ('ishl', -1, b), 0)),
])
for op in ('ior', 'iand', 'ixor'):