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/*
This file is part of ctak.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with ctak. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef TT_H
#define TT_H
#include <stdint.h>
#include <actions.h>
// ===================================================================
// Types
// ===================================================================
enum TT_FLAG { TT_EXACT, TT_LOWERBOUND, TT_UPPERBOUND };
typedef struct tt_node_s {
uint16_t gen;
uint64_t key;
enum TT_FLAG flag;
uint8_t depth;
float value;
action_t action;
} tt_entry_t;
// ===================================================================
// Variables
// ===================================================================
// Direct-mapped hash table (no chaining); one slot per key.
#define TT_SIZE ((uint32_t)((1 << 19) - 1))
// ===================================================================
// Methods
// ===================================================================
// Bump the generation counter, invalidating all entries (memsets the
// table on wraparound). Called from negamax_init when the board size
// (and hence the zobrist table) changes; entries are otherwise kept
// across plies on purpose (see negamax.c).
int tt_init(void);
tt_entry_t *tt_seek(const uint64_t key);
int tt_insert(const uint64_t key, const enum TT_FLAG flag, const uint8_t depth,
const float value, const action_t action);
#endif
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