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nir/algebraic: optimize ishl(iadd(iadd(iadd(a, #b), c), d), #e)

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This improves combining of constants offsets into memory accesses in
dEQP-VK.compute.pipeline.cooperative_matrix.khr_a.subgroupscope.mul.float16_float16.buffer.colmajor.linear

fossil-db (gfx1201):
Totals from 121 (0.06% of 208640) affected shaders:
Instrs: 204278 -> 204199 (-0.04%); split: -0.06%, +0.03%
CodeSize: 1110856 -> 1110076 (-0.07%); split: -0.10%, +0.03%
VGPRs: 7620 -> 7680 (+0.79%); split: -0.16%, +0.94%
Latency: 1225169 -> 1225067 (-0.01%); split: -0.02%, +0.01%
InvThroughput: 191629 -> 191580 (-0.03%); split: -0.03%, +0.01%
SClause: 5732 -> 5731 (-0.02%)
Copies: 16358 -> 16356 (-0.01%); split: -0.02%, +0.01%
PreSGPRs: 5715 -> 5711 (-0.07%)
PreVGPRs: 5907 -> 5905 (-0.03%)
VALU: 112808 -> 112742 (-0.06%); split: -0.06%, +0.00%
SALU: 27121 -> 27113 (-0.03%)

fossil-db (gfx1201, dEQP-VK.compute.pipeline.cooperative_matrix.*):
Totals from 198 (12.20% of 1623) affected shaders:
Instrs: 13011 -> 11584 (-10.97%)
CodeSize: 90188 -> 77920 (-13.60%)
VGPRs: 3456 -> 2724 (-21.18%)
Latency: 144421 -> 142553 (-1.29%)
InvThroughput: 11158 -> 10608 (-4.93%)
Copies: 1119 -> 1117 (-0.18%)
PreSGPRs: 1954 -> 1857 (-4.96%)
PreVGPRs: 1675 -> 1354 (-19.16%)
VALU: 4894 -> 3476 (-28.97%)

Signed-off-by: Rhys Perry <pendingchaos02@gmail.com>
Reviewed-by: Georg Lehmann <dadschoorse@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/41653>
This commit is contained in:
Rhys Perry 2026-05-13 10:07:41 +01:00 • committed by Marge Bot
parent c3db34a525
commit 81925d7f41
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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@ -721,6 +721,8 @@ optimizations.extend([
(('ishl', ('iadd', a, '#b'), '#c'), ('iadd', ('ishl', a, c), ('ishl', b, c))),
(('ishl', ('iadd(is_used_once)', ('iadd', a, '#b'), c), '#d'),
('iadd', ('ishl', ('iadd', a, c), d), ('ishl', b, d))),
(('ishl', ('iadd(is_used_once)', ('iadd(is_used_once)', ('iadd', a, '#b'), c), d), '#e'),
('iadd', ('ishl', ('iadd', ('iadd', a, c), d), e), ('ishl', b, e))),
# (a + #b) * #c => (a * #c) + (#b * #c)
(('imul', ('iadd(is_used_once)', a, '#b'), '#c'), ('iadd', ('imul', a, c), ('imul', b, c))),