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nir/opt_algebraic: use range analysis to detect no-op fmin/fmax

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Foz-DB Navi31:
Totals from 418 (0.52% of 80273) affected shaders:
Instrs: 564550 -> 564387 (-0.03%); split: -0.04%, +0.01%
CodeSize: 2983860 -> 2982684 (-0.04%); split: -0.05%, +0.01%
Latency: 4387264 -> 4386397 (-0.02%); split: -0.02%, +0.00%
InvThroughput: 717464 -> 716874 (-0.08%); split: -0.08%, +0.00%
Copies: 40126 -> 40125 (-0.00%)
VALU: 352128 -> 352003 (-0.04%); split: -0.04%, +0.01%
SALU: 50290 -> 50283 (-0.01%)

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 15:22:06 +02:00 • committed by Marge Bot
parent a0665e79e9
commit 261239a492
1 changed files with 4 additions and 0 deletions
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4
src/compiler/nir/nir_opt_algebraic.py
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@ -914,6 +914,10 @@ optimizations.extend([
(('umax', ('umin', a, b), a), a),
(('imin', ('imax', a, b), a), a),
(('imax', ('imin', a, b), a), a),
(('fmax(nsz)', 'a(is_a_number_not_negative)', 'b(is_not_positive)'), ('fmul', a, 1.0)),
(('fmin(nsz)', 'a(is_a_number_not_positive)', 'b(is_not_negative)'), ('fmul', a, 1.0)),
(('fmax', 'a(is_a_number_not_negative)', 'b(is_lt_zero)'), ('fmul', a, 1.0)),
(('fmin', 'a(is_a_number_not_positive)', 'b(is_gt_zero)'), ('fmul', a, 1.0)),
])
for op in ['ine', 'ieq', 'ilt', 'ige', 'ult', 'uge', 'bitz', 'bitnz',