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nir/opt_algebraic: push fsat into bcsel with constant

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bcsel doesn't have a free clamp modifier on AMD hardware,
but what's inside might have free clamp.

Foz-DB Navi31:
Totals from 873 (1.09% of 80273) affected shaders:
MaxWaves: 22008 -> 21968 (-0.18%)
Instrs: 4624956 -> 4623950 (-0.02%); split: -0.04%, +0.02%
CodeSize: 24152780 -> 24142884 (-0.04%); split: -0.05%, +0.01%
VGPRs: 57900 -> 57960 (+0.10%)
Latency: 28762622 -> 28749889 (-0.04%); split: -0.06%, +0.02%
InvThroughput: 5320810 -> 5320145 (-0.01%); split: -0.02%, +0.00%
VClause: 115879 -> 115929 (+0.04%); split: -0.10%, +0.14%
SClause: 93058 -> 93059 (+0.00%); split: -0.01%, +0.02%
Copies: 335674 -> 335845 (+0.05%); split: -0.05%, +0.10%
PreSGPRs: 53819 -> 53843 (+0.04%); split: -0.01%, +0.05%
PreVGPRs: 50908 -> 50939 (+0.06%); split: -0.02%, +0.08%
VALU: 2816395 -> 2815514 (-0.03%); split: -0.04%, +0.01%
SALU: 509988 -> 509987 (-0.00%); split: -0.02%, +0.02%

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 16:44:11 +02:00 • committed by Marge Bot
parent e9e5146848
commit a0665e79e9
1 changed files with 3 additions and 0 deletions
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3
src/compiler/nir/nir_opt_algebraic.py
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@ -1035,6 +1035,9 @@ optimizations.extend([
(('fsat', ('fmax', a, 'b(is_not_positive)')), ('fsat', a)),
(('fsat', ('bcsel(is_used_once)', a, b, '#c')), ('bcsel', a, ('fsat', b), ('fsat', c))),
(('fsat', ('bcsel(is_used_once)', a, '#b', c)), ('bcsel', a, ('fsat', b), ('fsat', c))),
(('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