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nir/opt_algebraic: optimize pack_half_rtz of bcsel with constant

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Foz-DB Navi21:
Totals from 448 (0.56% of 80255) affected shaders:
Instrs: 345474 -> 344791 (-0.20%); split: -0.20%, +0.00%
CodeSize: 1917784 -> 1913324 (-0.23%); split: -0.25%, +0.02%
VGPRs: 22344 -> 22416 (+0.32%)
Latency: 2320847 -> 2318161 (-0.12%); split: -0.13%, +0.01%
InvThroughput: 543008 -> 541722 (-0.24%)
SClause: 11450 -> 11459 (+0.08%)
Copies: 19991 -> 19949 (-0.21%); split: -0.23%, +0.02%
PreSGPRs: 19129 -> 19114 (-0.08%)
PreVGPRs: 19695 -> 19696 (+0.01%); split: -0.01%, +0.01%
VALU: 257627 -> 256948 (-0.26%)
SALU: 30432 -> 30422 (-0.03%)

Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/36535>
This commit is contained in:
Georg Lehmann 2025-08-01 21:42:36 +02:00 • committed by Marge Bot
parent 8512479097
commit bc3b09c5dd
1 changed files with 5 additions and 0 deletions
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5
src/compiler/nir/nir_opt_algebraic.py
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@ -3028,6 +3028,11 @@ optimizations += [
(('pack_half_2x16_rtz_split', ('fneg(is_used_once)', ('fmin(is_used_once)', a, '#b')), ('fneg(is_used_once)', ('fmin(is_used_once)', c, '#d'))),
('pack_32_2x16', ('fmax', ('fneg', ('unpack_32_2x16', ('pack_half_2x16_rtz_split', a, c))), ('fneg', ('unpack_32_2x16', ('pack_half_2x16_rtz_split', b, d))))),
'options->vectorize_vec2_16bit'),
(('pack_half_2x16_rtz_split', ('bcsel(is_used_once)', a, b, '#c'), ('bcsel(is_used_once)', a, d, '#e')),
('bcsel', a, ('pack_half_2x16_rtz_split', b, d), ('pack_half_2x16_rtz_split', c, e))),
(('pack_half_2x16_rtz_split', ('bcsel(is_used_once)', a, '#b', c), ('bcsel(is_used_once)', a, '#d', e)),
('bcsel', a, ('pack_half_2x16_rtz_split', b, d), ('pack_half_2x16_rtz_split', c, e))),
]
# Some operations such as iadd have the property that the bottom N bits of the