Dev Builds » 20201107-1549

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NCM plays each Stockfish dev build 20,000 times against Stockfish 14. This yields an approximate Elo difference and establishes confidence in the strength of the dev builds.


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Commit ID ba35c88ab84b959d41a67b3d8fcb40adc6537ec8
Author Tomasz Sobczyk
Date 2020-11-07 15:49:49 UTC
AVX-512 for smaller affine and feature transforms. For the feature transformer the code is analogical to AVX2 since there was room for easy adaptation of wider simd registers. For the smaller affine transforms that have 32 byte stride we keep 2 columns in one zmm register. We also unroll more aggressively so that in the end we have to do 16 parallel horizontal additions on ymm slices each consisting of 4 32-bit integers. The slices are embedded in 8 zmm registers. These changes provide about 1.5% speedup for AVX-512 builds. Closes No functional change.
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