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nir/opt_algebraic: optimize pack_half_rtz of b2f

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Foz-DB Navi21:
Totals from 13 (0.02% of 80255) affected shaders:
Instrs: 2313 -> 2306 (-0.30%); split: -0.35%, +0.04%
CodeSize: 13452 -> 13480 (+0.21%)
Latency: 12066 -> 12013 (-0.44%); split: -0.45%, +0.01%
InvThroughput: 2172 -> 2163 (-0.41%)
Copies: 112 -> 114 (+1.79%)
VALU: 1480 -> 1472 (-0.54%)
SALU: 154 -> 155 (+0.65%)

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 21:45:25 +02:00 • committed by Marge Bot
parent bc3b09c5dd
commit 1d885fab9c
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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@ -3033,6 +3033,8 @@ optimizations += [
('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))),
(('pack_half_2x16_rtz_split', ('b2f', 'a@1'), ('b2f', a)), ('bcsel', a, 0x3c003c00, 0)),
]
# Some operations such as iadd have the property that the bottom N bits of the