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Precompute moves and use magics index as compress mask on AVX512ICL

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Passed STC
https://tests.stockfishchess.org/tests/view/69f6df65b64b50e29dbed427
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 112224 W: 29195 L: 28782 D: 54247
Ptnml(0-2): 312, 12345, 30381, 12766, 308

Local speedup:
```
Result of 100 runs
base (...kfish.master) =    2050387  +/- 5497
test (./stockfish    ) =    2069598  +/- 4426
diff                   =     +19211  +/- 7468
speedup         = +0.0094
P(speedup > 0) =  1.0000
```

closes https://github.com/official-stockfish/Stockfish/pull/6797

No functional change
This commit is contained in:
Timothy Herchen
2026-05-04 08:33:01 +02:00
committed by Joost VandeVondele
parent ab8f901d25
commit 1554a2ca0b
3 changed files with 96 additions and 17 deletions
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src/nnue/layers/affine_transform_sparse_input.h
-13
View File
@@ -38,19 +38,6 @@
namespace Stockfish::Eval::NNUE::Layers {
#if (USE_SSSE3 | (USE_NEON >= 8))
static constexpr int lsb_index64[64] = {
0, 47, 1, 56, 48, 27, 2, 60, 57, 49, 41, 37, 28, 16, 3, 61, 54, 58, 35, 52, 50, 42,
21, 44, 38, 32, 29, 23, 17, 11, 4, 62, 46, 55, 26, 59, 40, 36, 15, 53, 34, 51, 20, 43,
31, 22, 10, 45, 25, 39, 14, 33, 19, 30, 9, 24, 13, 18, 8, 12, 7, 6, 5, 63};
constexpr int constexpr_lsb(uint64_t bb) {
assert(bb != 0);
constexpr uint64_t debruijn64 = 0x03F79D71B4CB0A89ULL;
return lsb_index64[((bb ^ (bb - 1)) * debruijn64) >> 58];
}
#endif
// Sparse input implementation
template<IndexType InDims, IndexType OutDims>
class AffineTransformSparseInput {