trans.h

   1 /*
   2  *      This program is free software; you can redistribute it and/or modify
   3  *      it under the terms of the GNU General Public License as published by
   4  *      the Free Software Foundation; either version 2 of the License, or
   5  *      (at your option) any later version.
   6  *
   7  *      This program is distributed in the hope that it will be useful,
   8  *      but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  *      GNU General Public License for more details.
  11  *
  12  *      You should have received a copy of the GNU General Public License
  13  *      along with this program; if not, write to the Free Software
  14  *      Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  15  */
  16
  17 enum HASHTABLE_FLAGS { INVALID, EXACT, LOWER, UPPER };
  18
  19 /*
  20  * move:  mdf & 0x1FFFFF;
  21  * depth: (mdf >> 21) & 0xFF
  22  * flag:  mdf >> 29
  23  */
  24 struct main_hash_entry_t {
  25         uint64_t key;
  26         int16_t score;
  27         uint16_t age;
  28         uint32_t mdf;
  29 };
  30
  31 struct pawn_hash_entry_t {
  32         uint64_t key;
  33         uint64_t passers;
  34         int16_t score_op;
  35         int16_t score_eg;
  36 };
  37
  38 /* age of transposition table (for replacement strategy) */
  39 extern uint16_t hashtable_age;
  40
  41 extern uint64_t pawn_hash_mask;
  42 extern uint64_t main_hash_mask;
  43
  44 extern struct pawn_hash_entry_t *pawn_hash[2];
  45 extern struct main_hash_entry_t *main_hash;
  46
  47 int initialize_main_hashtable(void);
  48 int initialize_pawn_hashtable(void);
  49
  50 int hashtable_get(int side, int depth, int ply, int *move, int *score);
  51 void hashtable_put(int side, int depth, int ply, int flag, int move, \
  52                 int score);
  53
  54 void clear_main_hashtable(void);
  55 void clear_pawn_hashtable(void);
  56 void free_main_hashtable(void);
  57 void free_pawn_hashtable(void);