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Reduce SIMD register count from 32 to 16

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in the case of avx512 and vnni512 archs.

Up to 17% speedup, depending on the compiler, e.g.

```
AMD pro 7840u (zen4 phoenix apu 4nm)
bash bench_parallel.sh ./stockfish_avx512_gcc13 ./stockfish_avx512_pr_gcc13 20 10
sf_base =  1077737 +/-   8446 (95%)
sf_test =  1264268 +/-   8543 (95%)
diff    =   186531 +/-   4280 (95%)
speedup =  17.308% +/- 0.397% (95%)
```

Prior to this patch, it appears gcc spills registers.

closes https://github.com/official-stockfish/Stockfish/pull/4796

No functional change
This commit is contained in:
mstembera 2023-09-21 19:26:11 -07:00 • committed by Joost VandeVondele
parent fce4cc1829
commit 95fe2b9a9d
1 changed files with 1 additions and 1 deletions
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2
src/nnue/nnue_feature_transformer.h
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@ -69,7 +69,7 @@ namespace Stockfish::Eval::NNUE {
#define vec_add_psqt_32(a,b) _mm256_add_epi32(a,b)
#define vec_sub_psqt_32(a,b) _mm256_sub_epi32(a,b)
#define vec_zero_psqt() _mm256_setzero_si256()
#define NumRegistersSIMD 32
#define NumRegistersSIMD 16
#define MaxChunkSize 64
#elif USE_AVX2