1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
|
#include "chess.h"
#include "data.h"
/* last modified 01/16/09 */
/*
*******************************************************************************
* *
* This group of procedures provide the three basic bitboard operators, *
* MSB(x) that determines the Most Significant Bit, LSB(x) that determines *
* the Least Significant Bit, and PopCnt(x) which returns the number of one *
* bits set in the word. *
* *
* We prefer to use hardware facilities (such as intel BSF/BSR) when they *
* are available, otherwise we resort to C and table lookups to do this in *
* the most efficient way possible. *
* *
*******************************************************************************
*/
#if (!defined(INLINE32) && !defined(VC_INLINE32) && !defined(INLINE64))
# if defined (_M_IA64)
# ifdef __ICL
typedef unsigned long long __m64;
# elif _MSC_VER >= 1300
typedef union __declspec (intrin_type) __declspec(align(8)) __m64 {
unsigned __int64 m64_u64;
float m64_f32[2];
__int8 m64_i8[8];
__int16 m64_i16[4];
__int32 m64_i32[2];
__int64 m64_i64;
unsigned __int8 m64_u8[8];
unsigned __int16 m64_u16[4];
unsigned __int32 m64_u32[2];
} __m64;
# endif
__m64 __m64_popcnt(__m64);
# pragma intrinsic (__m64_popcnt)
int PopCnt(register BITBOARD a) {
# ifdef __ICL
return (int) __m64_popcnt(a);
# else
__m64 m;
m.m64_u64 = a;
m = __m64_popcnt(m);
return (int) m.m64_u64;
# endif
}
# else
# if !defined(INLINE32) && !defined(VC_INLINE32)
int PopCnt(register BITBOARD a) {
int c = 0;
while (a) {
c++;
a &= a - 1;
}
return (c);
}
# endif
# endif
# if defined (_M_AMD64) || defined (_M_IA64)
extern unsigned char _BitScanReverse64(unsigned long *, unsigned __int64);
# pragma intrinsic (_BitScanReverse64)
extern unsigned char _BitScanForward64(unsigned long *, unsigned __int64);
# pragma intrinsic (_BitScanForward64)
int MSB(BITBOARD arg1) {
unsigned long index;
if (_BitScanReverse64(&index, arg1))
return index;
else
return 64;
}
int LSB(BITBOARD arg1) {
unsigned long index;
if (_BitScanForward64(&index, arg1))
return index;
else
return 64;
}
# else
# if !defined(INLINE32) && !defined(VC_INLINE32)
int MSB(BITBOARD arg1) {
if (arg1 >> 48)
return (msb[arg1 >> 48] + 48);
if ((arg1 >> 32) & 65535)
return (msb[(arg1 >> 32) & 65535] + 32);
if ((arg1 >> 16) & 65535)
return (msb[(arg1 >> 16) & 65535] + 16);
return (msb[arg1 & 65535]);
}
int LSB(BITBOARD arg1) {
if (arg1 & 65535)
return (lsb[arg1 & 65535]);
if ((arg1 >> 16) & 65535)
return (lsb[(arg1 >> 16) & 65535] + 16);
if ((arg1 >> 32) & 65535)
return (lsb[(arg1 >> 32) & 65535] + 32);
return (lsb[arg1 >> 48] + 48);
}
# endif
# endif
#endif
|
