From: mstembera <MissingEmail@email>
Date: Tue, 6 Sep 2022 22:02:35 +0000 (-0700)
Subject: Optimize AVX2 path in NNUE evaluation
X-Git-Url: https://git.sesse.net/?a=commitdiff_plain;h=82bb21dc7a198609589ef0cc78d185f00f619a90;hp=82bb21dc7a198609589ef0cc78d185f00f619a90;p=stockfish

Optimize AVX2 path in NNUE evaluation

always selecting AffineTransform specialization for small inputs.

A related patch was tested as

Initially tested as a simplification
STC https://tests.stockfishchess.org/tests/view/6317c3f437f41b13973d6dff
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 58072 W: 15619 L: 15425 D: 27028
Ptnml(0-2): 241, 6191, 15992, 6357, 255

Elo gain speedup test
STC https://tests.stockfishchess.org/tests/view/63181c1b37f41b13973d79dc
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 184496 W: 49922 L: 49401 D: 85173
Ptnml(0-2): 851, 19397, 51208, 19964, 828

and this patch gained in testing

speedup        = +0.0071
P(speedup > 0) =  1.0000
on CPU: 16 x AMD Ryzen 9 3950X

closes https://github.com/official-stockfish/Stockfish/pull/4158

No functional change
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