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doflip.c
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doflip.c
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/*
File: doflip.c
Modified: November 15, 2005
Authors: Gunnar Andersson ([email protected])
Toshihiko Okuhara
Contents: Low-level code which flips the discs (if any) affected
by a potential move, with or without updating the
hash code.
This piece of software is released under the GPL.
See the file COPYING for more information.
*/
#include <stdio.h>
#include <stdlib.h>
#include "doflip.h"
#include "error.h"
#include "globals.h"
#include "hash.h"
#include "macros.h"
#include "moves.h"
#include "patterns.h"
#include "texts.h"
#include "unflip.h"
/* Global variables */
unsigned int hash_update1, hash_update2;
/* The board split into nine regions. */
static const char board_region[100] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 1, 1, 2, 2, 2, 2, 3, 3, 0,
0, 1, 1, 2, 2, 2, 2, 3, 3, 0,
0, 4, 4, 5, 5, 5, 5, 6, 6, 0,
0, 4, 4, 5, 5, 5, 5, 6, 6, 0,
0, 4, 4, 5, 5, 5, 5, 6, 6, 0,
0, 4, 4, 5, 5, 5, 5, 6, 6, 0,
0, 7, 7, 8, 8, 8, 8, 9, 9, 0,
0, 7, 7, 8, 8, 8, 8, 9, 9, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};
#define DrctnlFlips_six( sq, inc, color, oppcol ) { \
int *pt = sq + inc; \
\
if ( *pt == oppcol ) { \
pt += inc; \
if ( *pt == oppcol ) { \
pt += inc; \
if ( *pt == oppcol ) { \
pt += inc; \
if ( *pt == oppcol ) { \
pt += inc; \
if ( *pt == oppcol ) { \
pt += inc; \
if ( *pt == oppcol ) \
pt += inc; \
} \
} \
} \
} \
if ( *pt == color ) { \
pt -= inc; \
do { \
*pt = color; \
*(t_flip_stack++) = pt; \
pt -= inc; \
} while ( pt != sq ); \
} \
} \
}
#define DrctnlFlips_four( sq, inc, color, oppcol ) { \
int *pt = sq + inc; \
\
if ( *pt == oppcol ) { \
pt += inc; \
if ( *pt == oppcol ) { \
pt += inc; \
if ( *pt == oppcol ) { \
pt += inc; \
if ( *pt == oppcol ) \
pt += inc; \
} \
} \
if ( *pt == color ) { \
pt -= inc; \
do { \
*pt = color; \
*(t_flip_stack++) = pt; \
pt -= inc; \
} while( pt != sq ); \
} \
} \
}
INLINE int REGPARM(2)
DoFlips_no_hash( int sqnum, int color ) {
int opp_color = OPP( color );
int *sq;
int **old_flip_stack, **t_flip_stack;
old_flip_stack = t_flip_stack = flip_stack;
sq = &board[sqnum];
switch ( board_region[sqnum] ) {
case 1:
DrctnlFlips_six( sq, 1, color, opp_color );
DrctnlFlips_six( sq, 11, color, opp_color );
DrctnlFlips_six( sq, 10, color, opp_color );
break;
case 2:
DrctnlFlips_four( sq, 1, color, opp_color );
DrctnlFlips_four( sq, 11, color, opp_color );
DrctnlFlips_six( sq, 10, color, opp_color );
DrctnlFlips_four( sq, 9, color, opp_color );
DrctnlFlips_four( sq, -1, color, opp_color );
break;
case 3:
DrctnlFlips_six( sq, 10, color, opp_color );
DrctnlFlips_six( sq, 9, color, opp_color );
DrctnlFlips_six( sq, -1, color, opp_color );
break;
case 4:
DrctnlFlips_four( sq, -10, color, opp_color );
DrctnlFlips_four( sq, -9, color, opp_color );
DrctnlFlips_six( sq, 1, color, opp_color );
DrctnlFlips_four( sq, 11, color, opp_color );
DrctnlFlips_four( sq, 10, color, opp_color );
break;
case 5:
DrctnlFlips_four( sq, -11, color, opp_color );
DrctnlFlips_four( sq, -10, color, opp_color );
DrctnlFlips_four( sq, -9, color, opp_color );
DrctnlFlips_four( sq, 1, color, opp_color );
DrctnlFlips_four( sq, 11, color, opp_color );
DrctnlFlips_four( sq, 10, color, opp_color );
DrctnlFlips_four( sq, 9, color, opp_color );
DrctnlFlips_four( sq, -1, color, opp_color );
break;
case 6:
DrctnlFlips_four( sq, -10, color, opp_color );
DrctnlFlips_four( sq, -11, color, opp_color );
DrctnlFlips_six( sq, -1, color, opp_color );
DrctnlFlips_four( sq, 9, color, opp_color );
DrctnlFlips_four( sq, 10, color, opp_color );
break;
case 7:
DrctnlFlips_six( sq, -10, color, opp_color );
DrctnlFlips_six( sq, -9, color, opp_color );
DrctnlFlips_six( sq, 1, color, opp_color );
break;
case 8:
DrctnlFlips_four( sq, -1, color, opp_color );
DrctnlFlips_four( sq, -11, color, opp_color );
DrctnlFlips_six( sq, -10, color, opp_color );
DrctnlFlips_four( sq, -9, color, opp_color );
DrctnlFlips_four( sq, 1, color, opp_color );
break;
case 9:
DrctnlFlips_six( sq, -10, color, opp_color );
DrctnlFlips_six( sq, -11, color, opp_color );
DrctnlFlips_six( sq, -1, color, opp_color );
break;
default:
break;
}
flip_stack = t_flip_stack;
return t_flip_stack - old_flip_stack;
}
#define DrctnlFlipsHash_four( sq, inc, color, oppcol ) { \
int *pt = sq + inc; \
\
if ( *pt == oppcol ) { \
pt += inc; \
if ( *pt == oppcol ) { \
pt += inc; \
if ( *pt == oppcol ) { \
pt += inc; \
if ( *pt == oppcol ) \
pt += inc; \
} \
} \
if ( *pt == color ) { \
pt -= inc; \
do { \
t_hash_update1 ^= hash_flip1[pt - board]; \
t_hash_update2 ^= hash_flip2[pt - board]; \
*pt = color; \
*(t_flip_stack++) = pt; \
pt -= inc; \
} while ( pt != sq ); \
} \
} \
}
#define DrctnlFlipsHash_six( sq, inc, color, oppcol ) { \
int *pt = sq + inc; \
\
if ( *pt == oppcol ) { \
pt += inc; \
if ( *pt == oppcol ) { \
pt += inc; \
if ( *pt == oppcol ) { \
pt += inc; \
if ( *pt == oppcol ) { \
pt += inc; \
if ( *pt == oppcol ) { \
pt += inc; \
if ( *pt == oppcol ) \
pt += inc; \
} \
} \
} \
} \
if ( *pt == color ) { \
pt -= inc; \
do { \
t_hash_update1 ^= hash_flip1[pt - board]; \
t_hash_update2 ^= hash_flip2[pt - board]; \
*pt = color; \
*(t_flip_stack++) = pt; \
pt -= inc; \
} while ( pt != sq ); \
} \
} \
}
INLINE int REGPARM(2)
DoFlips_hash( int sqnum, int color ) {
int opp_color = OPP( color );
int *sq;
int **old_flip_stack, **t_flip_stack;
int t_hash_update1, t_hash_update2;
old_flip_stack = t_flip_stack = flip_stack;
t_hash_update1 = t_hash_update2 = 0;
sq = &board[sqnum];
switch ( board_region[sqnum] ) {
case 1:
DrctnlFlipsHash_six( sq, 1, color, opp_color );
DrctnlFlipsHash_six( sq, 11, color, opp_color );
DrctnlFlipsHash_six( sq, 10, color, opp_color );
break;
case 2:
DrctnlFlipsHash_four( sq, 1, color, opp_color );
DrctnlFlipsHash_four( sq, 11, color, opp_color );
DrctnlFlipsHash_six( sq, 10, color, opp_color );
DrctnlFlipsHash_four( sq, 9, color, opp_color );
DrctnlFlipsHash_four( sq, -1, color, opp_color );
break;
case 3:
DrctnlFlipsHash_six( sq, 10, color, opp_color );
DrctnlFlipsHash_six( sq, 9, color, opp_color );
DrctnlFlipsHash_six( sq, -1, color, opp_color );
break;
case 4:
DrctnlFlipsHash_four( sq, -10, color, opp_color );
DrctnlFlipsHash_four( sq, -9, color, opp_color );
DrctnlFlipsHash_six( sq, 1, color, opp_color );
DrctnlFlipsHash_four( sq, 11, color, opp_color );
DrctnlFlipsHash_four( sq, 10, color, opp_color );
break;
case 5:
DrctnlFlipsHash_four( sq, -11, color, opp_color );
DrctnlFlipsHash_four( sq, -10, color, opp_color );
DrctnlFlipsHash_four( sq, -9, color, opp_color );
DrctnlFlipsHash_four( sq, 1, color, opp_color );
DrctnlFlipsHash_four( sq, 11, color, opp_color );
DrctnlFlipsHash_four( sq, 10, color, opp_color );
DrctnlFlipsHash_four( sq, 9, color, opp_color );
DrctnlFlipsHash_four( sq, -1, color, opp_color );
break;
case 6:
DrctnlFlipsHash_four( sq, -10, color, opp_color );
DrctnlFlipsHash_four( sq, -11, color, opp_color );
DrctnlFlipsHash_six( sq, -1, color, opp_color );
DrctnlFlipsHash_four( sq, 9, color, opp_color );
DrctnlFlipsHash_four( sq, 10, color, opp_color );
break;
case 7:
DrctnlFlipsHash_six( sq, -10, color, opp_color );
DrctnlFlipsHash_six( sq, -9, color, opp_color );
DrctnlFlipsHash_six( sq, 1, color, opp_color );
break;
case 8:
DrctnlFlipsHash_four( sq, -1, color, opp_color );
DrctnlFlipsHash_four( sq, -11, color, opp_color );
DrctnlFlipsHash_six( sq, -10, color, opp_color );
DrctnlFlipsHash_four( sq, -9, color, opp_color );
DrctnlFlipsHash_four( sq, 1, color, opp_color );
break;
case 9:
DrctnlFlipsHash_six( sq, -10, color, opp_color );
DrctnlFlipsHash_six( sq, -11, color, opp_color );
DrctnlFlipsHash_six( sq, -1, color, opp_color );
break;
default:
break;
}
#if 0
pfs = old_flip_stack;
while (pfs != t_flip_stack) {
t_hash_update1 ^= hash_flip1[*pfs - board];
t_hash_update2 ^= hash_flip2[*pfs - board];
++pfs;
}
#endif
hash_update1 = t_hash_update1;
hash_update2 = t_hash_update2;
flip_stack = t_flip_stack;
return t_flip_stack - old_flip_stack;
}