Files
stockfish/src/nnue
Linmiao XuandJoost VandeVondele fb1d777250 Split AVX-VNNI sparse affine accumulation two ways
Speedup measured by @anematode
```
Result of 100 runs
==================
base (...h.master.exe) = 1504448 +/- 15119
test (./stockfish.exe) = 1519239 +/- 15980
diff = +14791 +/- 4113

speedup = +0.0098
P(speedup > 0) = 1.0000

CPU: Intel Core Ultra 9 285H
```

Passed STC:
https://tests.stockfishchess.org/tests/view/6a4dc4c65529b8472df7fd56
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 48256 W: 12746 L: 12420 D: 23090
Ptnml(0-2): 144, 5310, 12913, 5598, 163

closes https://github.com/official-stockfish/Stockfish/pull/6961

No functional change
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..
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