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nir/opt_algebraic: optimize fsat(fmax(a, b)) where b is not positive

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Foz-DB Navi31:
Totals from 946 (1.18% of 80273) affected shaders:
Instrs: 4986082 -> 4983988 (-0.04%); split: -0.04%, +0.00%
CodeSize: 25998700 -> 25989796 (-0.03%); split: -0.04%, +0.00%
Latency: 45514742 -> 45510330 (-0.01%); split: -0.01%, +0.00%
InvThroughput: 8163529 -> 8162325 (-0.01%); split: -0.02%, +0.00%
VClause: 112105 -> 112104 (-0.00%); split: -0.00%, +0.00%
SClause: 109694 -> 109688 (-0.01%)
Copies: 372356 -> 372284 (-0.02%); split: -0.03%, +0.01%
Branches: 132636 -> 132633 (-0.00%)
PreVGPRs: 58997 -> 58979 (-0.03%); split: -0.03%, +0.00%
VALU: 3025662 -> 3024191 (-0.05%); split: -0.05%, +0.00%
SALU: 551712 -> 551714 (+0.00%); split: -0.00%, +0.00%

Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/36468>
This commit is contained in:
Georg Lehmann 2025-07-30 16:18:41 +02:00 • committed by Marge Bot
parent 898fa317dd
commit e9e5146848
1 changed files with 2 additions and 0 deletions
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2
src/compiler/nir/nir_opt_algebraic.py
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@ -1033,6 +1033,8 @@ optimizations.extend([
(('fmax', ('ffma(is_used_once)', 'a', ('fneg', a), '#b(is_zero_to_one)'), 0.0),
('fsat', ('ffma', a, ('fneg', a), b)), '!options->lower_fsat'),
(('fsat', ('fmax', a, 'b(is_not_positive)')), ('fsat', a)),
(('extract_u8', ('imin', ('imax', a, 0), 0xff), 0), ('imin', ('imax', a, 0), 0xff)),
# The ior versions are exact because fmin and fmax will always pick a