2 Stockfish, a UCI chess playing engine derived from Glaurung 2.1
3 Copyright (C) 2004-2020 The Stockfish developers (see AUTHORS file)
5 Stockfish is free software: you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation, either version 3 of the License, or
8 (at your option) any later version.
10 Stockfish is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>.
19 // Constants used in NNUE evaluation function
21 #ifndef NNUE_COMMON_H_INCLUDED
22 #define NNUE_COMMON_H_INCLUDED
25 #include <immintrin.h>
27 #elif defined(USE_SSE41)
28 #include <smmintrin.h>
30 #elif defined(USE_SSSE3)
31 #include <tmmintrin.h>
33 #elif defined(USE_SSE2)
34 #include <emmintrin.h>
36 #elif defined(USE_NEON)
40 namespace Eval::NNUE {
42 // Version of the evaluation file
43 constexpr std::uint32_t kVersion = 0x7AF32F16u;
45 // Constant used in evaluation value calculation
46 constexpr int FV_SCALE = 16;
47 constexpr int kWeightScaleBits = 6;
49 // Size of cache line (in bytes)
50 constexpr std::size_t kCacheLineSize = 64;
52 // SIMD width (in bytes)
54 constexpr std::size_t kSimdWidth = 32;
56 #elif defined(USE_SSE2)
57 constexpr std::size_t kSimdWidth = 16;
59 #elif defined(USE_NEON)
60 constexpr std::size_t kSimdWidth = 16;
63 constexpr std::size_t kMaxSimdWidth = 32;
65 // Type of input feature after conversion
66 using TransformedFeatureType = std::uint8_t;
67 using IndexType = std::uint32_t;
69 // Round n up to be a multiple of base
70 template <typename IntType>
71 constexpr IntType CeilToMultiple(IntType n, IntType base) {
72 return (n + base - 1) / base * base;
75 } // namespace Eval::NNUE
77 #endif // #ifndef NNUE_COMMON_H_INCLUDED