X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fbitboard.cpp;h=dd8023e9bd5770eef292f87301750dc55b1ccbcf;hp=0bbd155b10e0d71a1f3d52d83f25a95da72a86ec;hb=8008f784150d040497ac8bd5a5153d90ea0dbde6;hpb=bb751d6c890f5c50c642366d601740366cfae8d0
diff --git a/src/bitboard.cpp b/src/bitboard.cpp
index 0bbd155b..dd8023e9 100644
--- a/src/bitboard.cpp
+++ b/src/bitboard.cpp
@@ -1,17 +1,18 @@
/*
- 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 .
*/
@@ -24,72 +25,102 @@
#include
#include "bitboard.h"
+#include "bitcount.h"
#include "direction.h"
-////
-//// Constants and variables
-////
-
-const Bitboard SquaresByColorBB[2] = {BlackSquaresBB, WhiteSquaresBB};
+#if defined(IS_64BIT)
-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 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,
+ 0xa08520292120600ULL
};
-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 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,
+ 0x410201ce5c030092ULL
};
-const Bitboard RelativeRankBB[2][8] = {
- {
- Rank1BB, Rank2BB, Rank3BB, Rank4BB, Rank5BB, Rank6BB, Rank7BB, Rank8BB
- },
- {
- Rank8BB, Rank7BB, Rank6BB, Rank5BB, Rank4BB, Rank3BB, Rank2BB, Rank1BB
- }
+const int BShift[64] = {
+ 58, 59, 59, 59, 59, 59, 59, 58, 59, 59, 59, 59, 59, 59, 59, 59,
+ 59, 59, 57, 57, 57, 57, 59, 59, 59, 59, 57, 55, 55, 57, 59, 59,
+ 59, 59, 57, 55, 55, 57, 59, 59, 59, 59, 57, 57, 57, 57, 59, 59,
+ 59, 59, 59, 59, 59, 59, 59, 59, 58, 59, 59, 59, 59, 59, 59, 58
};
-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
- }
+const int RShift[64] = {
+ 52, 53, 53, 53, 53, 53, 53, 52, 53, 54, 54, 54, 54, 54, 54, 53,
+ 53, 54, 54, 54, 54, 54, 54, 53, 53, 54, 54, 54, 54, 54, 54, 53,
+ 53, 54, 54, 54, 54, 54, 54, 53, 53, 54, 54, 54, 54, 54, 54, 53,
+ 53, 54, 54, 54, 54, 54, 54, 53, 52, 53, 53, 53, 53, 53, 53, 52
};
-#if defined(USE_COMPACT_ROOK_ATTACKS)
+#else // if !defined(IS_64BIT)
-Bitboard RankAttacks[8][64], FileAttacks[8][64];
-
-#elif defined(USE_32BIT_ATTACKS)
+const uint64_t BMult[64] = {
+ 0x54142844c6a22981ULL, 0x710358a6ea25c19eULL, 0x704f746d63a4a8dcULL,
+ 0xbfed1a0b80f838c5ULL, 0x90561d5631e62110ULL, 0x2804260376e60944ULL,
+ 0x84a656409aa76871ULL, 0xf0267f64c28b6197ULL, 0x70764ebb762f0585ULL,
+ 0x92aa09e0cfe161deULL, 0x41ee1f6bb266f60eULL, 0xddcbf04f6039c444ULL,
+ 0x5a3fab7bac0d988aULL, 0xd3727877fa4eaa03ULL, 0xd988402d868ddaaeULL,
+ 0x812b291afa075c7cULL, 0x94faf987b685a932ULL, 0x3ed867d8470d08dbULL,
+ 0x92517660b8901de8ULL, 0x2d97e43e058814b4ULL, 0x880a10c220b25582ULL,
+ 0xc7c6520d1f1a0477ULL, 0xdbfc7fbcd7656aa6ULL, 0x78b1b9bfb1a2b84fULL,
+ 0x2f20037f112a0bc1ULL, 0x657171ea2269a916ULL, 0xc08302b07142210eULL,
+ 0x880a4403064080bULL, 0x3602420842208c00ULL, 0x852800dc7e0b6602ULL,
+ 0x595a3fbbaa0f03b2ULL, 0x9f01411558159d5eULL, 0x2b4a4a5f88b394f2ULL,
+ 0x4afcbffc292dd03aULL, 0x4a4094a3b3f10522ULL, 0xb06f00b491f30048ULL,
+ 0xd5b3820280d77004ULL, 0x8b2e01e7c8e57a75ULL, 0x2d342794e886c2e6ULL,
+ 0xc302c410cde21461ULL, 0x111f426f1379c274ULL, 0xe0569220abb31588ULL,
+ 0x5026d3064d453324ULL, 0xe2076040c343cd8aULL, 0x93efd1e1738021eeULL,
+ 0xb680804bed143132ULL, 0x44e361b21986944cULL, 0x44c60170ef5c598cULL,
+ 0xf4da475c195c9c94ULL, 0xa3afbb5f72060b1dULL, 0xbc75f410e41c4ffcULL,
+ 0xb51c099390520922ULL, 0x902c011f8f8ec368ULL, 0x950b56b3d6f5490aULL,
+ 0x3909e0635bf202d0ULL, 0x5744f90206ec10ccULL, 0xdc59fd76317abbc1ULL,
+ 0x881c7c67fcbfc4f6ULL, 0x47ca41e7e440d423ULL, 0xeb0c88112048d004ULL,
+ 0x51c60e04359aef1aULL, 0x1aa1fe0e957a5554ULL, 0xdd9448db4f5e3104ULL,
+ 0xdc01f6dca4bebbdcULL,
+};
const uint64_t RMult[64] = {
0xd7445cdec88002c0ULL, 0xd0a505c1f2001722ULL, 0xe065d1c896002182ULL,
@@ -116,6 +147,13 @@ const uint64_t RMult[64] = {
0x5ac08a4735370479ULL,
};
+const int BShift[64] = {
+ 26, 27, 27, 27, 27, 27, 27, 26, 27, 27, 27, 27, 27, 27, 27, 27,
+ 27, 27, 25, 25, 25, 25, 27, 27, 27, 27, 25, 23, 23, 25, 27, 27,
+ 27, 27, 25, 23, 23, 25, 27, 27, 27, 27, 25, 25, 25, 25, 27, 27,
+ 27, 27, 27, 27, 27, 27, 27, 27, 26, 27, 27, 27, 27, 27, 27, 26
+};
+
const int RShift[64] = {
20, 21, 21, 21, 21, 21, 21, 20, 21, 22, 22, 22, 22, 22, 22, 21,
21, 22, 22, 22, 22, 22, 22, 21, 21, 22, 22, 22, 22, 22, 22, 21,
@@ -123,124 +161,66 @@ const int RShift[64] = {
21, 22, 22, 22, 22, 22, 22, 21, 20, 21, 21, 21, 21, 21, 21, 20
};
-#else // if defined(USE_32BIT_ATTACKS)
+#endif // defined(IS_64BIT)
-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,
- 0x410201ce5c030092ULL
-};
+const Bitboard SquaresByColorBB[2] = { BlackSquaresBB, WhiteSquaresBB };
-const int RShift[64] = {
- 52, 53, 53, 53, 53, 53, 53, 52, 53, 54, 54, 54, 54, 54, 54, 53,
- 53, 54, 54, 54, 54, 54, 54, 53, 53, 54, 54, 54, 54, 54, 54, 53,
- 53, 54, 54, 54, 54, 54, 54, 53, 53, 54, 54, 54, 54, 54, 54, 53,
- 53, 54, 54, 54, 54, 54, 54, 53, 52, 53, 53, 53, 53, 53, 53, 52
+const Bitboard FileBB[8] = {
+ FileABB, FileBBB, FileCBB, FileDBB, FileEBB, FileFBB, FileGBB, FileHBB
};
-#endif // defined(USE_32BIT_ATTACKS)
-
-#if !defined(USE_COMPACT_ROOK_ATTACKS)
-Bitboard RMask[64];
-int RAttackIndex[64];
-Bitboard RAttacks[0x19000];
-#endif
-
-#if defined(USE_32BIT_ATTACKS)
-
-const uint64_t BMult[64] = {
- 0x54142844c6a22981ULL, 0x710358a6ea25c19eULL, 0x704f746d63a4a8dcULL,
- 0xbfed1a0b80f838c5ULL, 0x90561d5631e62110ULL, 0x2804260376e60944ULL,
- 0x84a656409aa76871ULL, 0xf0267f64c28b6197ULL, 0x70764ebb762f0585ULL,
- 0x92aa09e0cfe161deULL, 0x41ee1f6bb266f60eULL, 0xddcbf04f6039c444ULL,
- 0x5a3fab7bac0d988aULL, 0xd3727877fa4eaa03ULL, 0xd988402d868ddaaeULL,
- 0x812b291afa075c7cULL, 0x94faf987b685a932ULL, 0x3ed867d8470d08dbULL,
- 0x92517660b8901de8ULL, 0x2d97e43e058814b4ULL, 0x880a10c220b25582ULL,
- 0xc7c6520d1f1a0477ULL, 0xdbfc7fbcd7656aa6ULL, 0x78b1b9bfb1a2b84fULL,
- 0x2f20037f112a0bc1ULL, 0x657171ea2269a916ULL, 0xc08302b07142210eULL,
- 0x880a4403064080bULL, 0x3602420842208c00ULL, 0x852800dc7e0b6602ULL,
- 0x595a3fbbaa0f03b2ULL, 0x9f01411558159d5eULL, 0x2b4a4a5f88b394f2ULL,
- 0x4afcbffc292dd03aULL, 0x4a4094a3b3f10522ULL, 0xb06f00b491f30048ULL,
- 0xd5b3820280d77004ULL, 0x8b2e01e7c8e57a75ULL, 0x2d342794e886c2e6ULL,
- 0xc302c410cde21461ULL, 0x111f426f1379c274ULL, 0xe0569220abb31588ULL,
- 0x5026d3064d453324ULL, 0xe2076040c343cd8aULL, 0x93efd1e1738021eeULL,
- 0xb680804bed143132ULL, 0x44e361b21986944cULL, 0x44c60170ef5c598cULL,
- 0xf4da475c195c9c94ULL, 0xa3afbb5f72060b1dULL, 0xbc75f410e41c4ffcULL,
- 0xb51c099390520922ULL, 0x902c011f8f8ec368ULL, 0x950b56b3d6f5490aULL,
- 0x3909e0635bf202d0ULL, 0x5744f90206ec10ccULL, 0xdc59fd76317abbc1ULL,
- 0x881c7c67fcbfc4f6ULL, 0x47ca41e7e440d423ULL, 0xeb0c88112048d004ULL,
- 0x51c60e04359aef1aULL, 0x1aa1fe0e957a5554ULL, 0xdd9448db4f5e3104ULL,
- 0xdc01f6dca4bebbdcULL,
-};
+const Bitboard NeighboringFilesBB[8] = {
+ FileBBB, FileABB|FileCBB, FileBBB|FileDBB, FileCBB|FileEBB,
+ FileDBB|FileFBB, FileEBB|FileGBB, FileFBB|FileHBB, FileGBB
+};
-const int BShift[64] = {
- 26, 27, 27, 27, 27, 27, 27, 26, 27, 27, 27, 27, 27, 27, 27, 27,
- 27, 27, 25, 25, 25, 25, 27, 27, 27, 27, 25, 23, 23, 25, 27, 27,
- 27, 27, 25, 23, 23, 25, 27, 27, 27, 27, 25, 25, 25, 25, 27, 27,
- 27, 27, 27, 27, 27, 27, 27, 27, 26, 27, 27, 27, 27, 27, 27, 26
+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
};
-#else // if defined(USE_32BIT_ATTACKS)
+const Bitboard RankBB[8] = {
+ Rank1BB, Rank2BB, Rank3BB, Rank4BB, Rank5BB, Rank6BB, Rank7BB, Rank8BB
+};
-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,
- 0xa08520292120600ULL
+const Bitboard RelativeRankBB[2][8] = {
+ { Rank1BB, Rank2BB, Rank3BB, Rank4BB, Rank5BB, Rank6BB, Rank7BB, Rank8BB },
+ { Rank8BB, Rank7BB, Rank6BB, Rank5BB, Rank4BB, Rank3BB, Rank2BB, Rank1BB }
};
-const int BShift[64] = {
- 58, 59, 59, 59, 59, 59, 59, 58, 59, 59, 59, 59, 59, 59, 59, 59,
- 59, 59, 57, 57, 57, 57, 59, 59, 59, 59, 57, 55, 55, 57, 59, 59,
- 59, 59, 57, 55, 55, 57, 59, 59, 59, 59, 57, 57, 57, 57, 59, 59,
- 59, 59, 59, 59, 59, 59, 59, 59, 58, 59, 59, 59, 59, 59, 59, 58
+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
+ }
};
-#endif // defined(USE_32BIT_ATTACKS)
+Bitboard RMask[64];
+int RAttackIndex[64];
+Bitboard RAttacks[0x19000];
Bitboard BMask[64];
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];
@@ -253,12 +233,15 @@ Bitboard BishopPseudoAttacks[64];
Bitboard RookPseudoAttacks[64];
Bitboard QueenPseudoAttacks[64];
+uint8_t BitCount8Bit[256];
+
////
//// Local definitions
////
namespace {
+
void init_masks();
void init_ray_bitboards();
void init_attacks();
@@ -271,10 +254,7 @@ namespace {
const int shift[2], const Bitboard mult[],
int deltas[][2]);
void init_pseudo_attacks();
-#if defined(USE_COMPACT_ROOK_ATTACKS)
- void init_file_and_rank_attacks();
-#endif
-};
+}
////
@@ -305,29 +285,45 @@ void init_bitboards() {
init_ray_bitboards();
init_attacks();
init_between_bitboards();
-#if defined(USE_COMPACT_ROOK_ATTACKS)
- init_file_and_rank_attacks();
-#else
- init_sliding_attacks(RAttacks, RAttackIndex, RMask, RShift,
- RMult, rookDeltas);
-#endif
- init_sliding_attacks(BAttacks, BAttackIndex, BMask, BShift,
- BMult, bishopDeltas);
+ init_sliding_attacks(RAttacks, RAttackIndex, RMask, RShift, RMult, rookDeltas);
+ init_sliding_attacks(BAttacks, BAttackIndex, BMask, BShift, BMult, bishopDeltas);
init_pseudo_attacks();
}
-#if defined(USE_FOLDED_BITSCAN)
+/// first_1() finds the least significant nonzero bit in a nonzero bitboard.
+/// pop_1st_bit() finds and clears the least significant nonzero bit in a
+/// nonzero bitboard.
-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,
- 58, 20, 37, 17, 36, 8
+#if defined(IS_64BIT) && !defined(USE_BSFQ)
+
+static CACHE_LINE_ALIGNMENT
+const int BitTable[64] = {
+ 0, 1, 2, 7, 3, 13, 8, 19, 4, 25, 14, 28, 9, 34, 20, 40, 5, 17, 26, 38, 15,
+ 46, 29, 48, 10, 31, 35, 54, 21, 50, 41, 57, 63, 6, 12, 18, 24, 27, 33, 39,
+ 16, 37, 45, 47, 30, 53, 49, 56, 62, 11, 23, 32, 36, 44, 52, 55, 61, 22, 43,
+ 51, 60, 42, 59, 58
};
+Square first_1(Bitboard b) {
+ return Square(BitTable[((b & -b) * 0x218a392cd3d5dbfULL) >> 58]);
+}
-/// first_1() finds the least significant nonzero bit in a nonzero bitboard.
+Square pop_1st_bit(Bitboard* b) {
+ Bitboard bb = *b;
+ *b &= (*b - 1);
+ return Square(BitTable[((bb & -bb) * 0x218a392cd3d5dbfULL) >> 58]);
+}
+
+#elif !defined(USE_BSFQ)
+
+static CACHE_LINE_ALIGNMENT
+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,
+ 58, 20, 37, 17, 36, 8
+};
Square first_1(Bitboard b) {
b ^= (b - 1);
@@ -335,46 +331,77 @@ Square first_1(Bitboard b) {
return Square(BitTable[(fold * 0x783a9b23) >> 26]);
}
+// Use type-punning
+union b_union {
-/// pop_1st_bit() finds and clears the least significant nonzero bit in a
-/// nonzero bitboard.
-
-Square pop_1st_bit(Bitboard *b) {
- Bitboard bb = *b ^ (*b - 1);
- uint32_t fold = int(bb) ^ int(bb >> 32);
- *b &= (*b - 1);
- return Square(BitTable[(fold * 0x783a9b23) >> 26]);
-}
-
+ Bitboard b;
+ struct {
+#if defined (BIGENDIAN)
+ uint32_t h;
+ uint32_t l;
#else
-
-static const int BitTable[64] = {
- 0, 1, 2, 7, 3, 13, 8, 19, 4, 25, 14, 28, 9, 34, 20, 40, 5, 17, 26, 38, 15,
- 46, 29, 48, 10, 31, 35, 54, 21, 50, 41, 57, 63, 6, 12, 18, 24, 27, 33, 39,
- 16, 37, 45, 47, 30, 53, 49, 56, 62, 11, 23, 32, 36, 44, 52, 55, 61, 22, 43,
- 51, 60, 42, 59, 58
+ uint32_t l;
+ uint32_t h;
+#endif
+ } dw;
};
+Square pop_1st_bit(Bitboard* bb) {
-/// first_1() finds the least significant nonzero bit in a nonzero bitboard.
+ b_union u;
+ Square ret;
-Square first_1(Bitboard b) {
- return Square(BitTable[((b & -b) * 0x218a392cd3d5dbfULL) >> 58]);
+ u.b = *bb;
+
+ if (u.dw.l)
+ {
+ ret = Square(BitTable[((u.dw.l ^ (u.dw.l - 1)) * 0x783a9b23) >> 26]);
+ u.dw.l &= (u.dw.l - 1);
+ *bb = u.b;
+ return ret;
+ }
+ ret = Square(BitTable[((~(u.dw.h ^ (u.dw.h - 1))) * 0x783a9b23) >> 26]);
+ u.dw.h &= (u.dw.h - 1);
+ *bb = u.b;
+ return ret;
}
+#endif
-/// pop_1st_bit() finds and clears the least significant nonzero bit in a
-/// nonzero bitboard.
+// Optimized bitScanReverse32() implementation by Pascal Georges. Note
+// that first bit is 1, this allow to differentiate between 0 and 1.
+static CACHE_LINE_ALIGNMENT
+const char MsbTable[256] = {
+ 0, 1, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 5, 5,
+ 5, 5, 5, 5, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
+ 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 7, 7,
+ 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
+ 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
+ 7, 7, 7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
+ 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
+ 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
+ 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
+ 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
+ 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8
+};
-Square pop_1st_bit(Bitboard *b) {
- Bitboard bb = *b;
- *b &= (*b - 1);
- return Square(BitTable[((bb & -bb) * 0x218a392cd3d5dbfULL) >> 58]);
+int bitScanReverse32(uint32_t b)
+{
+ int result = 0;
+
+ if (b > 0xFFFF)
+ {
+ b >>= 16;
+ result += 16;
+ }
+ if (b > 0xFF)
+ {
+ b >>= 8;
+ result += 8;
+ }
+ return result + MsbTable[b];
}
-#endif // defined(USE_FOLDED_BITSCAN)
-
-
namespace {
// All functions below are used to precompute various bitboards during
@@ -383,6 +410,8 @@ namespace {
// 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];
@@ -393,12 +422,15 @@ namespace {
in_front_bb(c, s) & this_and_neighboring_files_bb(s);
OutpostMask[c][s] = in_front_bb(c, s) & neighboring_files_bb(s);
}
+
+ for (Bitboard b = 0ULL; b < 256ULL; b++)
+ BitCount8Bit[b] = (uint8_t)count_1s(b);
}
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])
@@ -417,7 +449,7 @@ namespace {
{-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;
@@ -483,26 +515,33 @@ namespace {
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(IS_64BIT)
j = (1 << (64 - shift[i]));
+#else
+ j = (1 << (32 - shift[i]));
+#endif
+
for(k = 0; k < j; k++) {
-#if defined(USE_32BIT_ATTACKS)
+
+#if defined(IS_64BIT)
b = index_to_bitboard(k, mask[i]);
- attacks[index +
- (unsigned(int(b) * int(mult[i]) ^
- int(b >> 32) * int(mult[i] >> 32))
- >> shift[i])] =
+ attacks[index + ((b * mult[i]) >> shift[i])] =
sliding_attacks(i, b, 4, deltas);
#else
b = index_to_bitboard(k, mask[i]);
- attacks[index + ((b * mult[i]) >> shift[i])] =
+ attacks[index +
+ (unsigned(int(b) * int(mult[i]) ^
+ int(b >> 32) * int(mult[i] >> 32))
+ >> shift[i])] =
sliding_attacks(i, b, 4, deltas);
#endif
}
index += j;
}
}
-
+
void init_pseudo_attacks() {
Square s;
@@ -513,29 +552,4 @@ namespace {
}
}
-#if defined(USE_COMPACT_ROOK_ATTACKS)
- void init_file_and_rank_attacks() {
- int i, j, k, l, m, s;
- Bitboard b1, b2;
- for(i = 0; i < 64; i++) {
-
- for(m = 0; m <= 1; m++) {
- b1 = 0ULL;
- for(j = 0; j < 6; j++) if(i & (1<= 0 && l <= 7; l += s) {
- b2 |= (m? RankBB[l] : FileBB[l]);
- if(b1 & (1ULL << (l*(1+m*7)))) break;
- }
- }
- if(m) FileAttacks[j][(b1*0xd6e8802041d0c441ULL) >> 58] = b2;
- else RankAttacks[j][i] = b2;
- }
- }
- }
- }
-#endif // defined(USE_COMPACT_ROOK_ATTACKS)
-
}