/*
- Glaurung, a UCI chess playing engine.
- Copyright (C) 2004-2008 Tord Romstad
+ Stockfish, a UCI chess playing engine derived from Glaurung 2.1
+ Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
+ Copyright (C) 2008-2009 Marco Costalba
- Glaurung is free software: you can redistribute it and/or modify
+ Stockfish 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.
-
- Glaurung is distributed in the hope that it will be useful,
+
+ Stockfish 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
//// Includes
////
+#ifdef _MSC_VER
+ #include <intrin.h>
+ #ifdef _WIN64
+ #pragma intrinsic(_BitScanForward64)
+ #else
+ #pragma intrinsic(_BitScanForward)
+ #endif
+ #define USING_INTRINSICS
+#endif
+
#include <iostream>
#include "bitboard.h"
#include "direction.h"
-////
-//// Constants and variables
-////
-
-const Bitboard SquaresByColorBB[2] = {BlackSquaresBB, WhiteSquaresBB};
-
-const Bitboard FileBB[8] = {
- FileABB, FileBBB, FileCBB, FileDBB, FileEBB, FileFBB, FileGBB, FileHBB
-};
-
-const Bitboard NeighboringFilesBB[8] = {
- FileBBB, FileABB|FileCBB, FileBBB|FileDBB, FileCBB|FileEBB,
- FileDBB|FileFBB, FileEBB|FileGBB, FileFBB|FileHBB, FileGBB
-};
-
-const Bitboard ThisAndNeighboringFilesBB[8] = {
- FileABB|FileBBB, FileABB|FileBBB|FileCBB,
- FileBBB|FileCBB|FileDBB, FileCBB|FileDBB|FileEBB,
- FileDBB|FileEBB|FileFBB, FileEBB|FileFBB|FileGBB,
- FileFBB|FileGBB|FileHBB, FileGBB|FileHBB
-};
-
-const Bitboard RankBB[8] = {
- Rank1BB, Rank2BB, Rank3BB, Rank4BB, Rank5BB, Rank6BB, Rank7BB, Rank8BB
-};
-
-const Bitboard RelativeRankBB[2][8] = {
- {
- Rank1BB, Rank2BB, Rank3BB, Rank4BB, Rank5BB, Rank6BB, Rank7BB, Rank8BB
- },
- {
- Rank8BB, Rank7BB, Rank6BB, Rank5BB, Rank4BB, Rank3BB, Rank2BB, Rank1BB
- }
-};
-
-const Bitboard InFrontBB[2][8] = {
- {
- Rank2BB | Rank3BB | Rank4BB | Rank5BB | Rank6BB | Rank7BB | Rank8BB,
- Rank3BB | Rank4BB | Rank5BB | Rank6BB | Rank7BB | Rank8BB,
- Rank4BB | Rank5BB | Rank6BB | Rank7BB | Rank8BB,
- Rank5BB | Rank6BB | Rank7BB | Rank8BB,
- Rank6BB | Rank7BB | Rank8BB,
- Rank7BB | Rank8BB,
- Rank8BB,
- EmptyBoardBB
- },
- {
- EmptyBoardBB,
- Rank1BB,
- Rank2BB | Rank1BB,
- Rank3BB | Rank2BB | Rank1BB,
- Rank4BB | Rank3BB | Rank2BB | Rank1BB,
- Rank5BB | Rank4BB | Rank3BB | Rank2BB | Rank1BB,
- Rank6BB | Rank5BB | Rank4BB | Rank3BB | Rank2BB | Rank1BB,
- Rank7BB | Rank6BB | Rank5BB | Rank4BB | Rank3BB | Rank2BB | Rank1BB
- }
-};
-
#if defined(USE_COMPACT_ROOK_ATTACKS)
Bitboard RankAttacks[8][64], FileAttacks[8][64];
#else // if defined(USE_32BIT_ATTACKS)
const uint64_t RMult[64] = {
- 0xa8002c000108020ULL, 0x4440200140003000ULL, 0x8080200010011880ULL,
- 0x380180080141000ULL, 0x1a00060008211044ULL, 0x410001000a0c0008ULL,
- 0x9500060004008100ULL, 0x100024284a20700ULL, 0x802140008000ULL,
- 0x80c01002a00840ULL, 0x402004282011020ULL, 0x9862000820420050ULL,
- 0x1001448011100ULL, 0x6432800200800400ULL, 0x40100010002000cULL,
- 0x2800d0010c080ULL, 0x90c0008000803042ULL, 0x4010004000200041ULL,
- 0x3010010200040ULL, 0xa40828028001000ULL, 0x123010008000430ULL,
- 0x24008004020080ULL, 0x60040001104802ULL, 0x582200028400d1ULL,
- 0x4000802080044000ULL, 0x408208200420308ULL, 0x610038080102000ULL,
- 0x3601000900100020ULL, 0x80080040180ULL, 0xc2020080040080ULL,
- 0x80084400100102ULL, 0x4022408200014401ULL, 0x40052040800082ULL,
- 0xb08200280804000ULL, 0x8a80a008801000ULL, 0x4000480080801000ULL,
- 0x911808800801401ULL, 0x822a003002001894ULL, 0x401068091400108aULL,
- 0x4a10a00004cULL, 0x2000800640008024ULL, 0x1486408102020020ULL,
- 0x100a000d50041ULL, 0x810050020b0020ULL, 0x204000800808004ULL,
- 0x20048100a000cULL, 0x112000831020004ULL, 0x9000040810002ULL,
- 0x440490200208200ULL, 0x8910401000200040ULL, 0x6404200050008480ULL,
- 0x4b824a2010010100ULL, 0x4080801810c0080ULL, 0x400802a0080ULL,
- 0x8224080110026400ULL, 0x40002c4104088200ULL, 0x1002100104a0282ULL,
- 0x1208400811048021ULL, 0x3201014a40d02001ULL, 0x5100019200501ULL,
- 0x101000208001005ULL, 0x2008450080702ULL, 0x1002080301d00cULL,
+ 0xa8002c000108020ULL, 0x4440200140003000ULL, 0x8080200010011880ULL,
+ 0x380180080141000ULL, 0x1a00060008211044ULL, 0x410001000a0c0008ULL,
+ 0x9500060004008100ULL, 0x100024284a20700ULL, 0x802140008000ULL,
+ 0x80c01002a00840ULL, 0x402004282011020ULL, 0x9862000820420050ULL,
+ 0x1001448011100ULL, 0x6432800200800400ULL, 0x40100010002000cULL,
+ 0x2800d0010c080ULL, 0x90c0008000803042ULL, 0x4010004000200041ULL,
+ 0x3010010200040ULL, 0xa40828028001000ULL, 0x123010008000430ULL,
+ 0x24008004020080ULL, 0x60040001104802ULL, 0x582200028400d1ULL,
+ 0x4000802080044000ULL, 0x408208200420308ULL, 0x610038080102000ULL,
+ 0x3601000900100020ULL, 0x80080040180ULL, 0xc2020080040080ULL,
+ 0x80084400100102ULL, 0x4022408200014401ULL, 0x40052040800082ULL,
+ 0xb08200280804000ULL, 0x8a80a008801000ULL, 0x4000480080801000ULL,
+ 0x911808800801401ULL, 0x822a003002001894ULL, 0x401068091400108aULL,
+ 0x4a10a00004cULL, 0x2000800640008024ULL, 0x1486408102020020ULL,
+ 0x100a000d50041ULL, 0x810050020b0020ULL, 0x204000800808004ULL,
+ 0x20048100a000cULL, 0x112000831020004ULL, 0x9000040810002ULL,
+ 0x440490200208200ULL, 0x8910401000200040ULL, 0x6404200050008480ULL,
+ 0x4b824a2010010100ULL, 0x4080801810c0080ULL, 0x400802a0080ULL,
+ 0x8224080110026400ULL, 0x40002c4104088200ULL, 0x1002100104a0282ULL,
+ 0x1208400811048021ULL, 0x3201014a40d02001ULL, 0x5100019200501ULL,
+ 0x101000208001005ULL, 0x2008450080702ULL, 0x1002080301d00cULL,
0x410201ce5c030092ULL
};
0x881c7c67fcbfc4f6ULL, 0x47ca41e7e440d423ULL, 0xeb0c88112048d004ULL,
0x51c60e04359aef1aULL, 0x1aa1fe0e957a5554ULL, 0xdd9448db4f5e3104ULL,
0xdc01f6dca4bebbdcULL,
-};
+};
const int BShift[64] = {
26, 27, 27, 27, 27, 27, 27, 26, 27, 27, 27, 27, 27, 27, 27, 27,
#else // if defined(USE_32BIT_ATTACKS)
const uint64_t BMult[64] = {
- 0x440049104032280ULL, 0x1021023c82008040ULL, 0x404040082000048ULL,
- 0x48c4440084048090ULL, 0x2801104026490000ULL, 0x4100880442040800ULL,
- 0x181011002e06040ULL, 0x9101004104200e00ULL, 0x1240848848310401ULL,
- 0x2000142828050024ULL, 0x1004024d5000ULL, 0x102044400800200ULL,
- 0x8108108820112000ULL, 0xa880818210c00046ULL, 0x4008008801082000ULL,
- 0x60882404049400ULL, 0x104402004240810ULL, 0xa002084250200ULL,
- 0x100b0880801100ULL, 0x4080201220101ULL, 0x44008080a00000ULL,
- 0x202200842000ULL, 0x5006004882d00808ULL, 0x200045080802ULL,
- 0x86100020200601ULL, 0xa802080a20112c02ULL, 0x80411218080900ULL,
- 0x200a0880080a0ULL, 0x9a01010000104000ULL, 0x28008003100080ULL,
- 0x211021004480417ULL, 0x401004188220806ULL, 0x825051400c2006ULL,
- 0x140c0210943000ULL, 0x242800300080ULL, 0xc2208120080200ULL,
- 0x2430008200002200ULL, 0x1010100112008040ULL, 0x8141050100020842ULL,
- 0x822081014405ULL, 0x800c049e40400804ULL, 0x4a0404028a000820ULL,
- 0x22060201041200ULL, 0x360904200840801ULL, 0x881a08208800400ULL,
- 0x60202c00400420ULL, 0x1204440086061400ULL, 0x8184042804040ULL,
- 0x64040315300400ULL, 0xc01008801090a00ULL, 0x808010401140c00ULL,
- 0x4004830c2020040ULL, 0x80005002020054ULL, 0x40000c14481a0490ULL,
- 0x10500101042048ULL, 0x1010100200424000ULL, 0x640901901040ULL,
- 0xa0201014840ULL, 0x840082aa011002ULL, 0x10010840084240aULL,
- 0x420400810420608ULL, 0x8d40230408102100ULL, 0x4a00200612222409ULL,
+ 0x440049104032280ULL, 0x1021023c82008040ULL, 0x404040082000048ULL,
+ 0x48c4440084048090ULL, 0x2801104026490000ULL, 0x4100880442040800ULL,
+ 0x181011002e06040ULL, 0x9101004104200e00ULL, 0x1240848848310401ULL,
+ 0x2000142828050024ULL, 0x1004024d5000ULL, 0x102044400800200ULL,
+ 0x8108108820112000ULL, 0xa880818210c00046ULL, 0x4008008801082000ULL,
+ 0x60882404049400ULL, 0x104402004240810ULL, 0xa002084250200ULL,
+ 0x100b0880801100ULL, 0x4080201220101ULL, 0x44008080a00000ULL,
+ 0x202200842000ULL, 0x5006004882d00808ULL, 0x200045080802ULL,
+ 0x86100020200601ULL, 0xa802080a20112c02ULL, 0x80411218080900ULL,
+ 0x200a0880080a0ULL, 0x9a01010000104000ULL, 0x28008003100080ULL,
+ 0x211021004480417ULL, 0x401004188220806ULL, 0x825051400c2006ULL,
+ 0x140c0210943000ULL, 0x242800300080ULL, 0xc2208120080200ULL,
+ 0x2430008200002200ULL, 0x1010100112008040ULL, 0x8141050100020842ULL,
+ 0x822081014405ULL, 0x800c049e40400804ULL, 0x4a0404028a000820ULL,
+ 0x22060201041200ULL, 0x360904200840801ULL, 0x881a08208800400ULL,
+ 0x60202c00400420ULL, 0x1204440086061400ULL, 0x8184042804040ULL,
+ 0x64040315300400ULL, 0xc01008801090a00ULL, 0x808010401140c00ULL,
+ 0x4004830c2020040ULL, 0x80005002020054ULL, 0x40000c14481a0490ULL,
+ 0x10500101042048ULL, 0x1010100200424000ULL, 0x640901901040ULL,
+ 0xa0201014840ULL, 0x840082aa011002ULL, 0x10010840084240aULL,
+ 0x420400810420608ULL, 0x8d40230408102100ULL, 0x4a00200612222409ULL,
0xa08520292120600ULL
};
int BAttackIndex[64];
Bitboard BAttacks[0x1480];
-Bitboard SetMaskBB[64];
-Bitboard ClearMaskBB[64];
+Bitboard SetMaskBB[65];
+Bitboard ClearMaskBB[65];
Bitboard StepAttackBB[16][64];
Bitboard RayBB[64][8];
////
namespace {
+
void init_masks();
void init_ray_bitboards();
void init_attacks();
#if defined(USE_COMPACT_ROOK_ATTACKS)
void init_file_and_rank_attacks();
#endif
-};
+}
////
#if defined(USE_FOLDED_BITSCAN)
static const int BitTable[64] = {
- 63, 30, 3, 32, 25, 41, 22, 33, 15, 50, 42, 13, 11, 53, 19, 34, 61, 29, 2,
- 51, 21, 43, 45, 10, 18, 47, 1, 54, 9, 57, 0, 35, 62, 31, 40, 4, 49, 5, 52,
- 26, 60, 6, 23, 44, 46, 27, 56, 16, 7, 39, 48, 24, 59, 14, 12, 55, 38, 28,
+ 63, 30, 3, 32, 25, 41, 22, 33, 15, 50, 42, 13, 11, 53, 19, 34, 61, 29, 2,
+ 51, 21, 43, 45, 10, 18, 47, 1, 54, 9, 57, 0, 35, 62, 31, 40, 4, 49, 5, 52,
+ 26, 60, 6, 23, 44, 46, 27, 56, 16, 7, 39, 48, 24, 59, 14, 12, 55, 38, 28,
58, 20, 37, 17, 36, 8
};
/// pop_1st_bit() finds and clears the least significant nonzero bit in a
/// nonzero bitboard.
+#if defined(USE_32BIT_ATTACKS)
+
+// Use type-punning
+union b_union {
+
+ Bitboard b;
+ struct {
+ uint32_t l;
+ uint32_t h;
+ } dw;
+};
+
+// WARNING: Needs -fno-strict-aliasing compiler option
+Square pop_1st_bit(Bitboard *bb) {
+
+ b_union u;
+ uint32_t b;
+
+ u.b = *bb;
+
+ if (u.dw.l)
+ {
+ b = u.dw.l;
+ *((uint32_t*)bb) = b & (b - 1);
+ b ^= (b - 1);
+ }
+ else
+ {
+ b = u.dw.h;
+ *((uint32_t*)bb+1) = b & (b - 1); // Little endian only?
+ b = ~(b ^ (b - 1));
+ }
+ return Square(BitTable[(b * 0x783a9b23) >> 26]);
+}
+
+#else
+
Square pop_1st_bit(Bitboard *b) {
Bitboard bb = *b ^ (*b - 1);
uint32_t fold = int(bb) ^ int(bb >> 32);
return Square(BitTable[(fold * 0x783a9b23) >> 26]);
}
+#endif
+
#else
static const int BitTable[64] = {
Square pop_1st_bit(Bitboard *b) {
Bitboard bb = *b;
*b &= (*b - 1);
- return Square(BitTable[((bb & -bb) * 0x218a392cd3d5dbfULL) >> 58]);
+ return Square(BitTable[((bb & -bb) * 0x218a392cd3d5dbfULL) >> 58]);
}
#endif // defined(USE_FOLDED_BITSCAN)
// be necessary to touch any of them.
void init_masks() {
+ SetMaskBB[SQ_NONE] = 0ULL;
+ ClearMaskBB[SQ_NONE] = ~SetMaskBB[SQ_NONE];
for(Square s = SQ_A1; s <= SQ_H8; s++) {
SetMaskBB[s] = (1ULL << s);
ClearMaskBB[s] = ~SetMaskBB[s];
void init_ray_bitboards() {
int d[8] = {1, -1, 16, -16, 17, -17, 15, -15};
- for(int i = 0; i < 128; i = i + 9 & ~8) {
+ for(int i = 0; i < 128; i = (i + 9) & ~8) {
for(int j = 0; j < 8; j++) {
RayBB[(i&7)|((i>>4)<<3)][j] = EmptyBoardBB;
for(int k = i + d[j]; (k & 0x88) == 0; k += d[j])
{-7,-9,0}, {17,15,10,6,-6,-10,-15,-17}, {9,7,-7,-9,0}, {8,1,-1,-8,0},
{9,7,-7,-9,8,1,-1,-8}, {9,7,-7,-9,8,1,-1,-8}
};
-
+
for(i = 0; i < 64; i++) {
for(j = 0; j <= int(BK); j++) {
StepAttackBB[j][i] = EmptyBoardBB;
Bitboard b;
for(i = 0; i < 64; i++) {
attackIndex[i] = index;
- mask[i] = sliding_attacks(i, 0ULL, 4, deltas, 1, 6, 1, 6);
+ mask[i] = sliding_attacks(i, 0ULL, 4, deltas, 1, 6, 1, 6);
+
+#if defined(USE_32BIT_ATTACKS)
+ j = (1 << (32 - shift[i]));
+#else
j = (1 << (64 - shift[i]));
+#endif
+
for(k = 0; k < j; k++) {
+
#if defined(USE_32BIT_ATTACKS)
b = index_to_bitboard(k, mask[i]);
- attacks[index +
- (unsigned(int(b) * int(mult[i]) ^
- int(b >> 32) * int(mult[i] >> 32))
+ attacks[index +
+ (unsigned(int(b) * int(mult[i]) ^
+ int(b >> 32) * int(mult[i] >> 32))
>> shift[i])] =
sliding_attacks(i, b, 4, deltas);
#else
index += j;
}
}
-
+
void init_pseudo_attacks() {
Square s;
}
}
#endif // defined(USE_COMPACT_ROOK_ATTACKS)
-
+
}
projects / stockfish / blobdiff