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nir/opt_algebraic: reassociate constants in ior(iand) chains

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Mostly affects one F1_23 shader that packs bitfields bit by bit.

Totals from 3 (0.00% of 79395) affected shaders:
Instrs: 5004 -> 4202 (-16.03%)
CodeSize: 30992 -> 23952 (-22.72%)
Latency: 28894 -> 28464 (-1.49%)
InvThroughput: 4095 -> 3934 (-3.93%)
Copies: 363 -> 376 (+3.58%)
PreVGPRs: 110 -> 109 (-0.91%)
VALU: 3035 -> 2504 (-17.50%)
SALU: 463 -> 459 (-0.86%)

Reviewed-by: Konstantin Seurer <konstantin.seurer@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/31009>
This commit is contained in:
Georg Lehmann
2024-09-04 10:19:40 +02:00
committed by Marge Bot
parent 0adaf92014
commit 6378bbaa82
1 changed files with 1 additions and 0 deletions
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1
src/compiler/nir/nir_opt_algebraic.py
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@@ -2003,6 +2003,7 @@ optimizations.extend([
(('iand', '#a', ('iand', 'b(is_not_const)', '#c')), ('iand', ('iand', a, c), b)),
(('ior', '#a', ('ior', 'b(is_not_const)', '#c')), ('ior', ('ior', a, c), b)),
(('ixor', '#a', ('ixor', 'b(is_not_const)', '#c')), ('ixor', ('ixor', a, c), b)),
(('ior', ('iand', a, '#c'), ('ior', b, ('iand', a, '#d'))), ('ior', b, ('iand', a, ('ior', c, d)))),
# Reassociate add chains for more MAD/FMA-friendly code
(('~fadd', ('fadd(is_used_once)', 'a(is_fmul)', 'b(is_fmul)'), 'c(is_not_fmul)'), ('fadd', ('fadd', a, c), b)),