along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
-
-////
-//// Includes
-////
-
#include <iostream>
#include "bitboard.h"
#include "bitcount.h"
-
#if defined(IS_64BIT)
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,
+ 0x0440049104032280ULL, 0x1021023C82008040ULL, 0x0404040082000048ULL,
+ 0x48C4440084048090ULL, 0x2801104026490000ULL, 0x4100880442040800ULL,
+ 0x0181011002E06040ULL, 0x9101004104200E00ULL, 0x1240848848310401ULL,
+ 0x2000142828050024ULL, 0x00001004024D5000ULL, 0x0102044400800200ULL,
+ 0x8108108820112000ULL, 0xA880818210C00046ULL, 0x4008008801082000ULL,
+ 0x0060882404049400ULL, 0x0104402004240810ULL, 0x000A002084250200ULL,
+ 0x00100B0880801100ULL, 0x0004080201220101ULL, 0x0044008080A00000ULL,
+ 0x0000202200842000ULL, 0x5006004882D00808ULL, 0x0000200045080802ULL,
+ 0x0086100020200601ULL, 0xA802080A20112C02ULL, 0x0080411218080900ULL,
+ 0x000200A0880080A0ULL, 0x9A01010000104000ULL, 0x0028008003100080ULL,
+ 0x0211021004480417ULL, 0x0401004188220806ULL, 0x00825051400C2006ULL,
+ 0x00140C0210943000ULL, 0x0000242800300080ULL, 0x00C2208120080200ULL,
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
+ 0x0000822081014405ULL, 0x800C049E40400804ULL, 0x4A0404028A000820ULL,
+ 0x0022060201041200ULL, 0x0360904200840801ULL, 0x0881A08208800400ULL,
+ 0x0060202C00400420ULL, 0x1204440086061400ULL, 0x0008184042804040ULL,
+ 0x0064040315300400ULL, 0x0C01008801090A00ULL, 0x0808010401140C00ULL,
+ 0x04004830C2020040ULL, 0x0080005002020054ULL, 0x40000C14481A0490ULL,
+ 0x0010500101042048ULL, 0x1010100200424000ULL, 0x0000640901901040ULL,
+ 0x00000A0201014840ULL, 0x00840082AA011002ULL, 0x010010840084240AULL,
+ 0x0420400810420608ULL, 0x8D40230408102100ULL, 0x4A00200612222409ULL,
+ 0x0A08520292120600ULL
};
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
+ 0x0A8002C000108020ULL, 0x4440200140003000ULL, 0x8080200010011880ULL,
+ 0x0380180080141000ULL, 0x1A00060008211044ULL, 0x410001000A0C0008ULL,
+ 0x9500060004008100ULL, 0x0100024284A20700ULL, 0x0000802140008000ULL,
+ 0x0080C01002A00840ULL, 0x0402004282011020ULL, 0x9862000820420050ULL,
+ 0x0001001448011100ULL, 0x6432800200800400ULL, 0x040100010002000CULL,
+ 0x0002800D0010C080ULL, 0x90C0008000803042ULL, 0x4010004000200041ULL,
+ 0x0003010010200040ULL, 0x0A40828028001000ULL, 0x0123010008000430ULL,
+ 0x0024008004020080ULL, 0x0060040001104802ULL, 0x00582200028400D1ULL,
+ 0x4000802080044000ULL, 0x0408208200420308ULL, 0x0610038080102000ULL,
+ 0x3601000900100020ULL, 0x0000080080040180ULL, 0x00C2020080040080ULL,
+ 0x0080084400100102ULL, 0x4022408200014401ULL, 0x0040052040800082ULL,
+ 0x0B08200280804000ULL, 0x008A80A008801000ULL, 0x4000480080801000ULL,
+ 0x0911808800801401ULL, 0x822A003002001894ULL, 0x401068091400108AULL,
+ 0x000004A10A00004CULL, 0x2000800640008024ULL, 0x1486408102020020ULL,
+ 0x000100A000D50041ULL, 0x00810050020B0020ULL, 0x0204000800808004ULL,
+ 0x00020048100A000CULL, 0x0112000831020004ULL, 0x0009000040810002ULL,
+ 0x0440490200208200ULL, 0x8910401000200040ULL, 0x6404200050008480ULL,
+ 0x4B824A2010010100ULL, 0x04080801810C0080ULL, 0x00000400802A0080ULL,
+ 0x8224080110026400ULL, 0x40002C4104088200ULL, 0x01002100104A0282ULL,
+ 0x1208400811048021ULL, 0x3201014A40D02001ULL, 0x0005100019200501ULL,
+ 0x0101000208001005ULL, 0x0002008450080702ULL, 0x001002080301D00CULL,
+ 0x410201CE5C030092ULL
};
const int BShift[64] = {
#else // if !defined(IS_64BIT)
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,
+ 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,
+ 0x0880A4403064080BULL, 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,
- 0x9a8c41e75a000892ULL, 0x8900b10c89002aa8ULL, 0x9b28d1c1d60005a2ULL,
- 0x15d6c88de002d9aULL, 0xb1dbfc802e8016a9ULL, 0x149a1042d9d60029ULL,
- 0xb9c08050599e002fULL, 0x132208c3af300403ULL, 0xc1000ce2e9c50070ULL,
- 0x9d9aa13c99020012ULL, 0xb6b078daf71e0046ULL, 0x9d880182fb6e002eULL,
- 0x52889f467e850037ULL, 0xda6dc008d19a8480ULL, 0x468286034f902420ULL,
- 0x7140ac09dc54c020ULL, 0xd76ffffa39548808ULL, 0xea901c4141500808ULL,
- 0xc91004093f953a02ULL, 0x2882afa8f6bb402ULL, 0xaebe335692442c01ULL,
- 0xe904a22079fb91eULL, 0x13a514851055f606ULL, 0x76c782018c8fe632ULL,
- 0x1dc012a9d116da06ULL, 0x3c9e0037264fffa6ULL, 0x2036002853c6e4a2ULL,
- 0xe3fe08500afb47d4ULL, 0xf38af25c86b025c2ULL, 0xc0800e2182cf9a40ULL,
- 0x72002480d1f60673ULL, 0x2500200bae6e9b53ULL, 0xc60018c1eefca252ULL,
- 0x600590473e3608aULL, 0x46002c4ab3fe51b2ULL, 0xa200011486bcc8d2ULL,
- 0xb680078095784c63ULL, 0x2742002639bf11aeULL, 0xc7d60021a5bdb142ULL,
- 0xc8c04016bb83d820ULL, 0xbd520028123b4842ULL, 0x9d1600344ac2a832ULL,
- 0x6a808005631c8a05ULL, 0x604600a148d5389aULL, 0xe2e40103d40dea65ULL,
- 0x945b5a0087c62a81ULL, 0x12dc200cd82d28eULL, 0x2431c600b5f9ef76ULL,
- 0xfb142a006a9b314aULL, 0x6870e00a1c97d62ULL, 0x2a9db2004a2689a2ULL,
- 0xd3594600caf5d1a2ULL, 0xee0e4900439344a7ULL, 0x89c4d266ca25007aULL,
- 0x3e0013a2743f97e3ULL, 0x180e31a0431378aULL, 0x3a9e465a4d42a512ULL,
- 0x98d0a11a0c0d9cc2ULL, 0x8e711c1aba19b01eULL, 0x8dcdc836dd201142ULL,
- 0x5ac08a4735370479ULL,
+ 0xD7445CDEC88002C0ULL, 0xD0A505C1F2001722ULL, 0xE065D1C896002182ULL,
+ 0x9A8C41E75A000892ULL, 0x8900B10C89002AA8ULL, 0x9B28D1C1D60005A2ULL,
+ 0x015D6C88DE002D9AULL, 0xB1DBFC802E8016A9ULL, 0x149A1042D9D60029ULL,
+ 0xB9C08050599E002FULL, 0x132208C3AF300403ULL, 0xC1000CE2E9C50070ULL,
+ 0x9D9AA13C99020012ULL, 0xB6B078DAF71E0046ULL, 0x9D880182FB6E002EULL,
+ 0x52889F467E850037ULL, 0xDA6DC008D19A8480ULL, 0x468286034F902420ULL,
+ 0x7140AC09DC54C020ULL, 0xD76FFFFA39548808ULL, 0xEA901C4141500808ULL,
+ 0xC91004093F953A02ULL, 0x02882AFA8F6BB402ULL, 0xAEBE335692442C01ULL,
+ 0x0E904A22079FB91EULL, 0x13A514851055F606ULL, 0x76C782018C8FE632ULL,
+ 0x1DC012A9D116DA06ULL, 0x3C9E0037264FFFA6ULL, 0x2036002853C6E4A2ULL,
+ 0xE3FE08500AFB47D4ULL, 0xF38AF25C86B025C2ULL, 0xC0800E2182CF9A40ULL,
+ 0x72002480D1F60673ULL, 0x2500200BAE6E9B53ULL, 0xC60018C1EEFCA252ULL,
+ 0x0600590473E3608AULL, 0x46002C4AB3FE51B2ULL, 0xA200011486BCC8D2ULL,
+ 0xB680078095784C63ULL, 0x2742002639BF11AEULL, 0xC7D60021A5BDB142ULL,
+ 0xC8C04016BB83D820ULL, 0xBD520028123B4842ULL, 0x9D1600344AC2A832ULL,
+ 0x6A808005631C8A05ULL, 0x604600A148D5389AULL, 0xE2E40103D40DEA65ULL,
+ 0x945B5A0087C62A81ULL, 0x012DC200CD82D28EULL, 0x2431C600B5F9EF76ULL,
+ 0xFB142A006A9B314AULL, 0x06870E00A1C97D62ULL, 0x2A9DB2004A2689A2ULL,
+ 0xD3594600CAF5D1A2ULL, 0xEE0E4900439344A7ULL, 0x89C4D266CA25007AULL,
+ 0x3E0013A2743F97E3ULL, 0x0180E31A0431378AULL, 0x3A9E465A4D42A512ULL,
+ 0x98D0A11A0C0D9CC2ULL, 0x8E711C1ABA19B01EULL, 0x8DCDC836DD201142ULL,
+ 0x5AC08A4735370479ULL,
};
const int BShift[64] = {
#endif // defined(IS_64BIT)
-const Bitboard LightSquaresBB = 0x55AA55AA55AA55AAULL;
-const Bitboard DarkSquaresBB = 0xAA55AA55AA55AA55ULL;
+static const Bitboard DarkSquaresBB = 0xAA55AA55AA55AA55ULL;
-const Bitboard SquaresByColorBB[2] = { DarkSquaresBB, LightSquaresBB };
+const Bitboard SquaresByColorBB[2] = { DarkSquaresBB, ~DarkSquaresBB };
const Bitboard FileBB[8] = {
FileABB, FileBBB, FileCBB, FileDBB, FileEBB, FileFBB, FileGBB, FileHBB
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,
}
};
+// Global bitboards definitions with static storage duration are
+// automatically set to zero before enter main().
Bitboard RMask[64];
int RAttackIndex[64];
Bitboard RAttacks[0x19000];
Bitboard SetMaskBB[65];
Bitboard ClearMaskBB[65];
-Bitboard StepAttackBB[16][64];
+Bitboard StepAttacksBB[16][64];
Bitboard BetweenBB[64][64];
Bitboard SquaresInFrontMask[2][64];
Bitboard QueenPseudoAttacks[64];
uint8_t BitCount8Bit[256];
-int8_t DirectionTable[64][64];
-
-////
-//// Local definitions
-////
namespace {
- SquareDelta get_direction(Square orig, Square dest);
- void init_direction_table();
void init_masks();
- void init_attacks();
- void init_between_bitboards();
+ void init_step_attacks();
void init_pseudo_attacks();
+ void init_between_bitboards();
Bitboard index_to_bitboard(int index, Bitboard mask);
- Bitboard sliding_attacks(int sq, Bitboard block, int dirs, int deltas[][2],
+ Bitboard sliding_attacks(int sq, Bitboard occupied, int deltas[][2],
int fmin, int fmax, int rmin, int rmax);
void init_sliding_attacks(Bitboard attacks[], int attackIndex[], Bitboard mask[],
const int shift[], const Bitboard mult[], int deltas[][2]);
}
-////
-//// Functions
-////
-
/// print_bitboard() prints a bitboard in an easily readable format to the
-/// standard output. This is sometimes useful for debugging.
+/// standard output. This is sometimes useful for debugging.
void print_bitboard(Bitboard b) {
for (Rank r = RANK_8; r >= RANK_1; r--)
{
- std::cout << "+---+---+---+---+---+---+---+---+" << std::endl;
+ std::cout << "+---+---+---+---+---+---+---+---+" << '\n';
for (File f = FILE_A; f <= FILE_H; f++)
- std::cout << "| " << (bit_is_set(b, make_square(f, r))? 'X' : ' ') << ' ';
+ std::cout << "| " << (bit_is_set(b, make_square(f, r)) ? 'X' : ' ') << ' ';
- std::cout << "|" << std::endl;
+ std::cout << "|\n";
}
std::cout << "+---+---+---+---+---+---+---+---+" << std::endl;
}
-/// init_bitboards() initializes various bitboard arrays. It is called during
-/// program initialization.
-
-void init_bitboards() {
-
- int rookDeltas[4][2] = {{0,1},{0,-1},{1,0},{-1,0}};
- int bishopDeltas[4][2] = {{1,1},{-1,1},{1,-1},{-1,-1}};
-
- init_direction_table();
- init_masks();
- init_attacks();
- init_between_bitboards();
- init_sliding_attacks(RAttacks, RAttackIndex, RMask, RShift, RMult, rookDeltas);
- init_sliding_attacks(BAttacks, BAttackIndex, BMask, BShift, BMult, bishopDeltas);
- init_pseudo_attacks();
-}
-
-
/// 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 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
+ 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) {
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
+ 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) {
return ret;
}
-#endif
+#endif // !defined(USE_BSFQ)
+
+
+/// init_bitboards() initializes various bitboard arrays. It is called during
+/// program initialization.
+
+void init_bitboards() {
+
+ int rookDeltas[4][2] = {{0,1},{0,-1},{1,0},{-1,0}};
+ int bishopDeltas[4][2] = {{1,1},{-1,1},{1,-1},{-1,-1}};
+ init_masks();
+ init_step_attacks();
+ init_sliding_attacks(RAttacks, RAttackIndex, RMask, RShift, RMult, rookDeltas);
+ init_sliding_attacks(BAttacks, BAttackIndex, BMask, BShift, BMult, bishopDeltas);
+ init_pseudo_attacks();
+ init_between_bitboards();
+}
namespace {
// understand, but they all seem to work correctly, and it should never
// be necessary to touch any of them.
- SquareDelta get_direction(Square orig, Square dest) {
-
- const SquareDelta directions[] = {
- DELTA_E, DELTA_N, DELTA_NE, DELTA_NW, DELTA_W, DELTA_S, DELTA_SW, DELTA_SE
- };
-
- for (int idx = 0; idx < 8; idx++)
- {
- Square from = orig;
- Square to = from + directions[idx];
-
- while (to != dest && square_distance(to, from) == 1 && square_is_ok(to))
- {
- from = to;
- to += directions[idx];
- }
-
- if (to == dest && square_distance(from, to) == 1)
- return directions[idx];
- }
- return DELTA_NONE;
- }
-
- void init_direction_table() {
-
- for (Square s1 = SQ_A1; s1 <= SQ_H8; s1++)
- for (Square s2 = SQ_A1; s2 <= SQ_H8; s2++)
- DirectionTable[s1][s2] = uint8_t(get_direction(s1, s2));
- }
-
void init_masks() {
- SetMaskBB[SQ_NONE] = 0ULL;
+ SetMaskBB[SQ_NONE] = EmptyBoardBB;
ClearMaskBB[SQ_NONE] = ~SetMaskBB[SQ_NONE];
for (Square s = SQ_A1; s <= SQ_H8; s++)
BitCount8Bit[b] = (uint8_t)count_1s<CNT32>(b);
}
- void init_attacks() {
+ void init_step_attacks() {
- const int step[16][8] = {
+ const int step[][9] = {
{0},
- {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}, {0}, {0},
- {-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}
+ {7,9,0}, {17,15,10,6,-6,-10,-15,-17,0}, {0}, {0}, {0},
+ {9,7,-7,-9,8,1,-1,-8,0}, {0}, {0},
+ {-7,-9,0}, {17,15,10,6,-6,-10,-15,-17,0}, {0}, {0}, {0},
+ {9,7,-7,-9,8,1,-1,-8,0}
};
- for (int i = 0; i < 64; i++)
- for (int j = 0; j <= int(BK); j++)
- {
- StepAttackBB[j][i] = EmptyBoardBB;
- for (int k = 0; k < 8 && step[j][k] != 0; k++)
+ for (Square s = SQ_A1; s <= SQ_H8; s++)
+ for (Piece pc = WP; pc <= BK; pc++)
+ for (int k = 0; step[pc][k] != 0; k++)
{
- int l = i + step[j][k];
- if (l >= 0 && l < 64 && abs((i & 7) - (l & 7)) < 3)
- StepAttackBB[j][i] |= (1ULL << l);
+ Square to = s + Square(step[pc][k]);
+
+ if (square_is_ok(to) && square_distance(s, to) < 3)
+ set_bit(&StepAttacksBB[pc][s], to);
}
- }
}
- Bitboard sliding_attacks(int sq, Bitboard block, int dirs, int deltas[][2],
- int fmin=0, int fmax=7, int rmin=0, int rmax=7) {
- Bitboard result = 0ULL;
+ Bitboard sliding_attacks(int sq, Bitboard occupied, int deltas[][2],
+ int fmin, int fmax, int rmin, int rmax) {
+ int dx, dy, f, r;
int rk = sq / 8;
int fl = sq % 8;
+ Bitboard attacks = EmptyBoardBB;
- for (int i = 0; i < dirs; i++)
+ for (int i = 0; i < 4; i++)
{
- int dx = deltas[i][0];
- int dy = deltas[i][1];
- int f = fl + dx;
- int r = rk + dy;
+ dx = deltas[i][0];
+ dy = deltas[i][1];
+ f = fl + dx;
+ r = rk + dy;
while ( (dx == 0 || (f >= fmin && f <= fmax))
&& (dy == 0 || (r >= rmin && r <= rmax)))
{
- result |= (1ULL << (f + r*8));
- if (block & (1ULL << (f + r*8)))
+ attacks |= (1ULL << (f + r * 8));
+
+ if (occupied & (1ULL << (f + r * 8)))
break;
f += dx;
r += dy;
}
}
- return result;
- }
-
- void init_between_bitboards() {
-
- Square s1, s2, s3;
- SquareDelta d;
-
- for (s1 = SQ_A1; s1 <= SQ_H8; s1++)
- for (s2 = SQ_A1; s2 <= SQ_H8; s2++)
- {
- BetweenBB[s1][s2] = EmptyBoardBB;
- d = SquareDelta(DirectionTable[s1][s2]);
-
- if (d == DELTA_NONE)
- continue;
-
- for (s3 = s1 + d; s3 != s2; s3 += d)
- set_bit(&(BetweenBB[s1][s2]), s3);
- }
+ return attacks;
}
Bitboard index_to_bitboard(int index, Bitboard mask) {
- Bitboard result = 0ULL;
- int bits = count_1s<CNT32>(mask);
+ Bitboard result = EmptyBoardBB;
+ int sq, cnt = 0;
- for (int i = 0; i < bits; i++)
+ while (mask)
{
- int j = pop_1st_bit(&mask);
- if (index & (1 << i))
- result |= (1ULL << j);
+ sq = pop_1st_bit(&mask);
+
+ if (index & (1 << cnt++))
+ result |= (1ULL << sq);
}
return result;
}
void init_sliding_attacks(Bitboard attacks[], int attackIndex[], Bitboard mask[],
const int shift[], const Bitboard mult[], int deltas[][2]) {
+ Bitboard b, v;
+ int i, j, index;
- for (int i = 0, index = 0; i < 64; i++)
+ for (i = index = 0; i < 64; i++)
{
attackIndex[i] = index;
- mask[i] = sliding_attacks(i, 0, 4, deltas, 1, 6, 1, 6);
-
-#if defined(IS_64BIT)
- int j = (1 << (64 - shift[i]));
-#else
- int j = (1 << (32 - shift[i]));
-#endif
+ mask[i] = sliding_attacks(i, 0, deltas, 1, 6, 1, 6);
+ j = 1 << ((CpuIs64Bit ? 64 : 32) - shift[i]);
for (int k = 0; k < j; k++)
{
-#if defined(IS_64BIT)
- Bitboard b = index_to_bitboard(k, mask[i]);
- attacks[index + ((b * mult[i]) >> shift[i])] = sliding_attacks(i, b, 4, deltas);
-#else
- Bitboard b = index_to_bitboard(k, mask[i]);
- unsigned v = int(b) * int(mult[i]) ^ int(b >> 32) * int(mult[i] >> 32);
- attacks[index + (v >> shift[i])] = sliding_attacks(i, b, 4, deltas);
-#endif
+ b = index_to_bitboard(k, mask[i]);
+ v = CpuIs64Bit ? b * mult[i] : unsigned(b * mult[i] ^ (b >> 32) * (mult[i] >> 32));
+ attacks[index + (v >> shift[i])] = sliding_attacks(i, b, deltas, 0, 7, 0, 7);
}
index += j;
}
}
}
+ void init_between_bitboards() {
+
+ Square s1, s2, s3, d;
+ int f, r;
+
+ for (s1 = SQ_A1; s1 <= SQ_H8; s1++)
+ for (s2 = SQ_A1; s2 <= SQ_H8; s2++)
+ if (bit_is_set(QueenPseudoAttacks[s1], s2))
+ {
+ f = file_distance(s1, s2);
+ r = rank_distance(s1, s2);
+
+ d = (s2 - s1) / Max(f, r);
+
+ for (s3 = s1 + d; s3 != s2; s3 += d)
+ set_bit(&(BetweenBB[s1][s2]), s3);
+ }
+ }
+
}
projects / stockfish / blobdiff