149 lines
4.4 KiB
C++
149 lines
4.4 KiB
C++
/*
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Stockfish, a UCI chess playing engine derived from Glaurung 2.1
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Copyright (C) 2004-2020 The Stockfish developers (see AUTHORS file)
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Stockfish is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Stockfish is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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// Constants used in NNUE evaluation function
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#ifndef NNUE_COMMON_H_INCLUDED
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#define NNUE_COMMON_H_INCLUDED
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#include <cstring>
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#include <iostream>
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#if defined(USE_AVX2)
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#include <immintrin.h>
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#elif defined(USE_SSE41)
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#include <smmintrin.h>
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#elif defined(USE_SSSE3)
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#include <tmmintrin.h>
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#elif defined(USE_SSE2)
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#include <emmintrin.h>
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#elif defined(USE_MMX)
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#include <mmintrin.h>
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#elif defined(USE_NEON)
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#include <arm_neon.h>
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#endif
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// HACK: Use _mm256_loadu_si256() instead of _mm256_load_si256. Otherwise a binary
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// compiled with older g++ crashes because the output memory is not aligned
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// even though alignas is specified.
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#if defined(USE_AVX2)
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#if defined(__GNUC__ ) && (__GNUC__ < 9) && defined(_WIN32) && !defined(__clang__)
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#define _mm256_loadA_si256 _mm256_loadu_si256
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#define _mm256_storeA_si256 _mm256_storeu_si256
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#else
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#define _mm256_loadA_si256 _mm256_load_si256
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#define _mm256_storeA_si256 _mm256_store_si256
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#endif
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#endif
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#if defined(USE_AVX512)
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#if defined(__GNUC__ ) && (__GNUC__ < 9) && defined(_WIN32) && !defined(__clang__)
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#define _mm512_loadA_si512 _mm512_loadu_si512
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#define _mm512_storeA_si512 _mm512_storeu_si512
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#else
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#define _mm512_loadA_si512 _mm512_load_si512
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#define _mm512_storeA_si512 _mm512_store_si512
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#endif
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#endif
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namespace Eval::NNUE {
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// Version of the evaluation file
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constexpr std::uint32_t kVersion = 0x7AF32F16u;
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// Constant used in evaluation value calculation
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constexpr int FV_SCALE = 16;
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constexpr int kWeightScaleBits = 6;
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// Size of cache line (in bytes)
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constexpr std::size_t kCacheLineSize = 64;
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// SIMD width (in bytes)
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#if defined(USE_AVX2)
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constexpr std::size_t kSimdWidth = 32;
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#elif defined(USE_SSE2)
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constexpr std::size_t kSimdWidth = 16;
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#elif defined(USE_MMX)
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constexpr std::size_t kSimdWidth = 8;
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#elif defined(USE_NEON)
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constexpr std::size_t kSimdWidth = 16;
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#endif
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constexpr std::size_t kMaxSimdWidth = 32;
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// unique number for each piece type on each square
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enum {
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PS_NONE = 0,
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PS_W_PAWN = 1,
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PS_B_PAWN = 1 * SQUARE_NB + 1,
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PS_W_KNIGHT = 2 * SQUARE_NB + 1,
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PS_B_KNIGHT = 3 * SQUARE_NB + 1,
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PS_W_BISHOP = 4 * SQUARE_NB + 1,
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PS_B_BISHOP = 5 * SQUARE_NB + 1,
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PS_W_ROOK = 6 * SQUARE_NB + 1,
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PS_B_ROOK = 7 * SQUARE_NB + 1,
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PS_W_QUEEN = 8 * SQUARE_NB + 1,
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PS_B_QUEEN = 9 * SQUARE_NB + 1,
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PS_W_KING = 10 * SQUARE_NB + 1,
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PS_END = PS_W_KING, // pieces without kings (pawns included)
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PS_B_KING = 11 * SQUARE_NB + 1,
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PS_END2 = 12 * SQUARE_NB + 1
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};
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extern uint32_t kpp_board_index[PIECE_NB][COLOR_NB];
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// Type of input feature after conversion
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using TransformedFeatureType = std::uint8_t;
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using IndexType = std::uint32_t;
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// Round n up to be a multiple of base
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template <typename IntType>
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constexpr IntType CeilToMultiple(IntType n, IntType base) {
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return (n + base - 1) / base * base;
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}
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// read_little_endian() is our utility to read an integer (signed or unsigned, any size)
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// from a stream in little-endian order. We swap the byte order after the read if
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// necessary to return a result with the byte ordering of the compiling machine.
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template <typename IntType>
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inline IntType read_little_endian(std::istream& stream) {
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IntType result;
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std::uint8_t u[sizeof(IntType)];
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typename std::make_unsigned<IntType>::type v = 0;
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stream.read(reinterpret_cast<char*>(u), sizeof(IntType));
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for (std::size_t i = 0; i < sizeof(IntType); ++i)
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v = (v << 8) | u[sizeof(IntType) - i - 1];
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std::memcpy(&result, &v, sizeof(IntType));
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return result;
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}
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} // namespace Eval::NNUE
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#endif // #ifndef NNUE_COMMON_H_INCLUDED
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