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Calculate sum from first elements

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in affine transform for AVX512/AVX2/SSSE3

The idea is to initialize sum with the first element instead of zero.
Reduce one add_epi32 and one set_zero SIMD instructions for each output dimension.

sum = 0; for i = 1 to n sum += a[i] ->
sum = a[1]; for i = 2 to n sum += a[i]

STC:
LLR: 2.95 (-2.94,2.94) {-0.25,1.25}
Total: 69048 W: 7024 L: 6799 D: 55225
Ptnml(0-2): 260, 5175, 23458, 5342, 289
https://tests.stockfishchess.org/tests/view/5faf2cf467cbf42301d6aa06

closes https://github.com/official-stockfish/Stockfish/pull/3227

No functional change.
This commit is contained in:
MaximMolchanov
2020-11-14 02:55:29 +02:00
committed by Joost VandeVondele
parent 9fb6383ed8
commit 7615e3485e
2 changed files with 148 additions and 64 deletions
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@@ -112,6 +112,7 @@ Mark Tenzer (31m059)
marotear
Matthew Lai (matthewlai)
Matthew Sullivan (Matt14916)
Maxim Molchanov (Maxim)
Michael An (man)
Michael Byrne (MichaelB7)
Michael Chaly (Vizvezdenec)