stellar

UCI Chess engine written in C++20
git clone git://git.dimitrijedobrota.com/stellar.git
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commit00388d4c00764e6a1f68f488b2c3a20dec31baf0
parentb11e6be8d05fb81b7823e182e9afe7ca18c85486
authorDimitrije Dobrota <mail@dimitrijedobrota.com>
dateTue, 19 Mar 2024 20:28:37 +0000

Template transposition table

Diffstat:
MCMakeLists.txt|+-
Msrc/engine/engine.cpp|++++++++++++------------

2 files changed, 13 insertions(+), 13 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt

@@ -3,7 +3,7 @@ set(CMAKE_EXPORT_COMPILE_COMMANDS ON)

project(
Stellar
VERSION 1.3.6
VERSION 1.3.7
DESCRIPTION "Chess engine written in C++"
HOMEPAGE_URL https://git.dimitrijedobrota.com/stellar.git
LANGUAGES CXX

diff --git a/src/engine/engine.cpp b/src/engine/engine.cpp

@@ -41,15 +41,12 @@ struct Hashe {

Flag flag;
};
class TTable {
template <U64 size> class TTable_internal {
public:
static inline constexpr const int16_t unknown = 32500;
TTable() = default;
TTable(U64 size) : table(size, {0}) {}
void clear() { table.clear(); };
int16_t read(const Board &board, int ply, Move *best, int16_t alpha, int16_t beta, uint8_t depth) const {
static void clear() { memset(table.data(), 0x00, size * sizeof(Hashe)); };
static int16_t read(const Board &board, int ply, Move *best, int16_t alpha, int16_t beta, uint8_t depth) {
U64 hash = board.get_hash();
const Hashe &phashe = table[hash % table.size()];
if (phashe.key == hash) {

@@ -68,7 +65,8 @@ class TTable {

return unknown;
}
void write(const Board &board, int ply, Move best, int16_t score, uint8_t depth, Hashe::Flag flag) {
static void write(const Board &board, int ply, Move best, int16_t score, uint8_t depth,
Hashe::Flag flag) {
U64 hash = board.get_hash();
Hashe &phashe = table[hash % table.size()];

@@ -79,9 +77,11 @@ class TTable {

}
private:
std::vector<Hashe> table;
static std::array<Hashe, size> table;
};
template <U64 size> std::array<Hashe, size> TTable_internal<size>::table;
class PVTable {
public:
Move best(uint8_t ply = 0) { return table[0][ply]; }

@@ -107,9 +107,11 @@ std::ostream &operator<<(std::ostream &os, const PVTable &pvtable) {

return os;
}
using TTable = TTable_internal<C64(0x2FB4377)>;
TTable ttable;
static const uci::Settings *settings = nullptr;
static Board board;
static TTable ttable;
static repetition::Table rtable;
static PVTable pvtable;

@@ -403,9 +405,7 @@ Move search_position(const uci::Settings &settingsr) {

int16_t alpha = -SCORE_INFINITY, beta = SCORE_INFINITY;
settings = &settingsr;
if (settings->newgame) {
ttable = TTable(C64(0x2FB4377));
}
if (settings->newgame) ttable.clear();
rtable.clear();
board = settings->board;