1/*
2    Sjeng - a chess variants playing program
3    Copyright (C) 2000 Gian-Carlo Pascutto
4
5    This program 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 2 of the License, or
8    (at your option) any later version.
9
10    This program 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.
14
15    You should have received a copy of the GNU General Public License
16    along with this program; if not, write to the Free Software
17    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
18
19    File: ecache.c
20    Purpose: handling of the evaluation cache
21
22*/
23
24#include "sjeng.h"
25#include "protos.h"
26#include "extvars.h"
27
28typedef struct
29{
30uint32_t stored_hash;
31uint32_t hold_hash;
32int32_t score;
33} ECacheType;
34
35/*ECacheType ECache[ECACHESIZE];*/
36ECacheType *ECache;
37
38uint32_t ECacheProbes;
39uint32_t ECacheHits;
40
41void storeECache(int32_t score)
42{
43  int index;
44
45  index = hash % ECacheSize;
46
47  ECache[index].stored_hash = hash;
48  ECache[index].hold_hash = hold_hash;
49  ECache[index].score = score;
50}
51
52void checkECache(int32_t *score, int *in_cache)
53{
54  int index;
55
56  ECacheProbes++;
57
58  index = hash % ECacheSize;
59
60  if(ECache[index].stored_hash == hash &&
61	  ECache[index].hold_hash == hold_hash)
62
63    {
64      ECacheHits++;
65
66      *in_cache = 1;
67      *score = ECache[index].score;
68    }
69}
70
71void reset_ecache(void)
72{
73  memset(ECache, 0, sizeof(ECacheType)*ECacheSize);
74  return;
75}
76
77void alloc_ecache(void)
78{
79  ECache = (ECacheType*)malloc(sizeof(ECacheType)*ECacheSize);
80
81  if (ECache == NULL)
82  {
83    printf("Out of memory allocating ECache.\n");
84    exit(EXIT_FAILURE);
85  }
86
87  printf("Allocated %u eval cache entries, totalling %u bytes.\n",
88		 (uint32_t)ECacheSize, (uint32_t)(sizeof(ECacheType)*ECacheSize));
89  return;
90}
91
92void free_ecache(void)
93{
94  free(ECache);
95  return;
96}
97