mirror of
https://github.com/HChaZZY/Stockfish.git
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Retire USE_COMPACT_ROOK_ATTACKS and USE_FOLDED_BITSCAN defines
This greatly simplifies bitboard.cpp that now has only two setups, respectively for 32 and 64 bits CPU according to IS_64BIT define that is automatically set but can be tweaked manually in bitboard.h No functional change both in 32 and in 64 bits. Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
353
src/bitboard.cpp
353
src/bitboard.cpp
@@ -22,16 +22,6 @@
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//// Includes
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////
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#ifdef _MSC_VER
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#include <intrin.h>
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#ifdef _WIN64
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#pragma intrinsic(_BitScanForward64)
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#else
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#pragma intrinsic(_BitScanForward)
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#endif
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#define USING_INTRINSICS
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#endif
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#include <iostream>
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#include "bitboard.h"
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@@ -39,121 +29,7 @@
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#include "direction.h"
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#if defined(USE_COMPACT_ROOK_ATTACKS)
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Bitboard RankAttacks[8][64], FileAttacks[8][64];
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#elif defined(USE_32BIT_ATTACKS)
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const uint64_t RMult[64] = {
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0xd7445cdec88002c0ULL, 0xd0a505c1f2001722ULL, 0xe065d1c896002182ULL,
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0x9a8c41e75a000892ULL, 0x8900b10c89002aa8ULL, 0x9b28d1c1d60005a2ULL,
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0x15d6c88de002d9aULL, 0xb1dbfc802e8016a9ULL, 0x149a1042d9d60029ULL,
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0xb9c08050599e002fULL, 0x132208c3af300403ULL, 0xc1000ce2e9c50070ULL,
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0x9d9aa13c99020012ULL, 0xb6b078daf71e0046ULL, 0x9d880182fb6e002eULL,
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0x52889f467e850037ULL, 0xda6dc008d19a8480ULL, 0x468286034f902420ULL,
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0x7140ac09dc54c020ULL, 0xd76ffffa39548808ULL, 0xea901c4141500808ULL,
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0xc91004093f953a02ULL, 0x2882afa8f6bb402ULL, 0xaebe335692442c01ULL,
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0xe904a22079fb91eULL, 0x13a514851055f606ULL, 0x76c782018c8fe632ULL,
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0x1dc012a9d116da06ULL, 0x3c9e0037264fffa6ULL, 0x2036002853c6e4a2ULL,
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0xe3fe08500afb47d4ULL, 0xf38af25c86b025c2ULL, 0xc0800e2182cf9a40ULL,
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0x72002480d1f60673ULL, 0x2500200bae6e9b53ULL, 0xc60018c1eefca252ULL,
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0x600590473e3608aULL, 0x46002c4ab3fe51b2ULL, 0xa200011486bcc8d2ULL,
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0xb680078095784c63ULL, 0x2742002639bf11aeULL, 0xc7d60021a5bdb142ULL,
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0xc8c04016bb83d820ULL, 0xbd520028123b4842ULL, 0x9d1600344ac2a832ULL,
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0x6a808005631c8a05ULL, 0x604600a148d5389aULL, 0xe2e40103d40dea65ULL,
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0x945b5a0087c62a81ULL, 0x12dc200cd82d28eULL, 0x2431c600b5f9ef76ULL,
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0xfb142a006a9b314aULL, 0x6870e00a1c97d62ULL, 0x2a9db2004a2689a2ULL,
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0xd3594600caf5d1a2ULL, 0xee0e4900439344a7ULL, 0x89c4d266ca25007aULL,
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0x3e0013a2743f97e3ULL, 0x180e31a0431378aULL, 0x3a9e465a4d42a512ULL,
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0x98d0a11a0c0d9cc2ULL, 0x8e711c1aba19b01eULL, 0x8dcdc836dd201142ULL,
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0x5ac08a4735370479ULL,
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};
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const int RShift[64] = {
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20, 21, 21, 21, 21, 21, 21, 20, 21, 22, 22, 22, 22, 22, 22, 21,
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21, 22, 22, 22, 22, 22, 22, 21, 21, 22, 22, 22, 22, 22, 22, 21,
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21, 22, 22, 22, 22, 22, 22, 21, 21, 22, 22, 22, 22, 22, 22, 21,
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21, 22, 22, 22, 22, 22, 22, 21, 20, 21, 21, 21, 21, 21, 21, 20
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};
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#else // if defined(USE_32BIT_ATTACKS)
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const uint64_t RMult[64] = {
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0xa8002c000108020ULL, 0x4440200140003000ULL, 0x8080200010011880ULL,
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0x380180080141000ULL, 0x1a00060008211044ULL, 0x410001000a0c0008ULL,
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0x9500060004008100ULL, 0x100024284a20700ULL, 0x802140008000ULL,
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0x80c01002a00840ULL, 0x402004282011020ULL, 0x9862000820420050ULL,
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0x1001448011100ULL, 0x6432800200800400ULL, 0x40100010002000cULL,
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0x2800d0010c080ULL, 0x90c0008000803042ULL, 0x4010004000200041ULL,
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0x3010010200040ULL, 0xa40828028001000ULL, 0x123010008000430ULL,
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0x24008004020080ULL, 0x60040001104802ULL, 0x582200028400d1ULL,
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0x4000802080044000ULL, 0x408208200420308ULL, 0x610038080102000ULL,
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0x3601000900100020ULL, 0x80080040180ULL, 0xc2020080040080ULL,
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0x80084400100102ULL, 0x4022408200014401ULL, 0x40052040800082ULL,
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0xb08200280804000ULL, 0x8a80a008801000ULL, 0x4000480080801000ULL,
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0x911808800801401ULL, 0x822a003002001894ULL, 0x401068091400108aULL,
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0x4a10a00004cULL, 0x2000800640008024ULL, 0x1486408102020020ULL,
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0x100a000d50041ULL, 0x810050020b0020ULL, 0x204000800808004ULL,
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0x20048100a000cULL, 0x112000831020004ULL, 0x9000040810002ULL,
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0x440490200208200ULL, 0x8910401000200040ULL, 0x6404200050008480ULL,
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0x4b824a2010010100ULL, 0x4080801810c0080ULL, 0x400802a0080ULL,
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0x8224080110026400ULL, 0x40002c4104088200ULL, 0x1002100104a0282ULL,
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0x1208400811048021ULL, 0x3201014a40d02001ULL, 0x5100019200501ULL,
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0x101000208001005ULL, 0x2008450080702ULL, 0x1002080301d00cULL,
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0x410201ce5c030092ULL
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};
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const int RShift[64] = {
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52, 53, 53, 53, 53, 53, 53, 52, 53, 54, 54, 54, 54, 54, 54, 53,
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53, 54, 54, 54, 54, 54, 54, 53, 53, 54, 54, 54, 54, 54, 54, 53,
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53, 54, 54, 54, 54, 54, 54, 53, 53, 54, 54, 54, 54, 54, 54, 53,
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53, 54, 54, 54, 54, 54, 54, 53, 52, 53, 53, 53, 53, 53, 53, 52
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};
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#endif // defined(USE_32BIT_ATTACKS)
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#if !defined(USE_COMPACT_ROOK_ATTACKS)
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Bitboard RMask[64];
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int RAttackIndex[64];
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Bitboard RAttacks[0x19000];
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#endif
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#if defined(USE_32BIT_ATTACKS)
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const uint64_t BMult[64] = {
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0x54142844c6a22981ULL, 0x710358a6ea25c19eULL, 0x704f746d63a4a8dcULL,
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0xbfed1a0b80f838c5ULL, 0x90561d5631e62110ULL, 0x2804260376e60944ULL,
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0x84a656409aa76871ULL, 0xf0267f64c28b6197ULL, 0x70764ebb762f0585ULL,
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0x92aa09e0cfe161deULL, 0x41ee1f6bb266f60eULL, 0xddcbf04f6039c444ULL,
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0x5a3fab7bac0d988aULL, 0xd3727877fa4eaa03ULL, 0xd988402d868ddaaeULL,
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0x812b291afa075c7cULL, 0x94faf987b685a932ULL, 0x3ed867d8470d08dbULL,
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0x92517660b8901de8ULL, 0x2d97e43e058814b4ULL, 0x880a10c220b25582ULL,
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0xc7c6520d1f1a0477ULL, 0xdbfc7fbcd7656aa6ULL, 0x78b1b9bfb1a2b84fULL,
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0x2f20037f112a0bc1ULL, 0x657171ea2269a916ULL, 0xc08302b07142210eULL,
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0x880a4403064080bULL, 0x3602420842208c00ULL, 0x852800dc7e0b6602ULL,
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0x595a3fbbaa0f03b2ULL, 0x9f01411558159d5eULL, 0x2b4a4a5f88b394f2ULL,
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0x4afcbffc292dd03aULL, 0x4a4094a3b3f10522ULL, 0xb06f00b491f30048ULL,
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0xd5b3820280d77004ULL, 0x8b2e01e7c8e57a75ULL, 0x2d342794e886c2e6ULL,
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0xc302c410cde21461ULL, 0x111f426f1379c274ULL, 0xe0569220abb31588ULL,
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0x5026d3064d453324ULL, 0xe2076040c343cd8aULL, 0x93efd1e1738021eeULL,
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0xb680804bed143132ULL, 0x44e361b21986944cULL, 0x44c60170ef5c598cULL,
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0xf4da475c195c9c94ULL, 0xa3afbb5f72060b1dULL, 0xbc75f410e41c4ffcULL,
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0xb51c099390520922ULL, 0x902c011f8f8ec368ULL, 0x950b56b3d6f5490aULL,
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0x3909e0635bf202d0ULL, 0x5744f90206ec10ccULL, 0xdc59fd76317abbc1ULL,
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0x881c7c67fcbfc4f6ULL, 0x47ca41e7e440d423ULL, 0xeb0c88112048d004ULL,
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0x51c60e04359aef1aULL, 0x1aa1fe0e957a5554ULL, 0xdd9448db4f5e3104ULL,
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0xdc01f6dca4bebbdcULL,
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};
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const int BShift[64] = {
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26, 27, 27, 27, 27, 27, 27, 26, 27, 27, 27, 27, 27, 27, 27, 27,
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27, 27, 25, 25, 25, 25, 27, 27, 27, 27, 25, 23, 23, 25, 27, 27,
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27, 27, 25, 23, 23, 25, 27, 27, 27, 27, 25, 25, 25, 25, 27, 27,
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27, 27, 27, 27, 27, 27, 27, 27, 26, 27, 27, 27, 27, 27, 27, 26
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};
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#else // if defined(USE_32BIT_ATTACKS)
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#if defined(IS_64BIT)
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const uint64_t BMult[64] = {
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0x440049104032280ULL, 0x1021023c82008040ULL, 0x404040082000048ULL,
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@@ -180,6 +56,31 @@ const uint64_t BMult[64] = {
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0xa08520292120600ULL
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};
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const uint64_t RMult[64] = {
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0xa8002c000108020ULL, 0x4440200140003000ULL, 0x8080200010011880ULL,
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0x380180080141000ULL, 0x1a00060008211044ULL, 0x410001000a0c0008ULL,
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0x9500060004008100ULL, 0x100024284a20700ULL, 0x802140008000ULL,
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0x80c01002a00840ULL, 0x402004282011020ULL, 0x9862000820420050ULL,
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0x1001448011100ULL, 0x6432800200800400ULL, 0x40100010002000cULL,
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0x2800d0010c080ULL, 0x90c0008000803042ULL, 0x4010004000200041ULL,
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0x3010010200040ULL, 0xa40828028001000ULL, 0x123010008000430ULL,
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0x24008004020080ULL, 0x60040001104802ULL, 0x582200028400d1ULL,
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0x4000802080044000ULL, 0x408208200420308ULL, 0x610038080102000ULL,
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0x3601000900100020ULL, 0x80080040180ULL, 0xc2020080040080ULL,
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0x80084400100102ULL, 0x4022408200014401ULL, 0x40052040800082ULL,
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0xb08200280804000ULL, 0x8a80a008801000ULL, 0x4000480080801000ULL,
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0x911808800801401ULL, 0x822a003002001894ULL, 0x401068091400108aULL,
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||||
0x4a10a00004cULL, 0x2000800640008024ULL, 0x1486408102020020ULL,
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||||
0x100a000d50041ULL, 0x810050020b0020ULL, 0x204000800808004ULL,
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0x20048100a000cULL, 0x112000831020004ULL, 0x9000040810002ULL,
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||||
0x440490200208200ULL, 0x8910401000200040ULL, 0x6404200050008480ULL,
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||||
0x4b824a2010010100ULL, 0x4080801810c0080ULL, 0x400802a0080ULL,
|
||||
0x8224080110026400ULL, 0x40002c4104088200ULL, 0x1002100104a0282ULL,
|
||||
0x1208400811048021ULL, 0x3201014a40d02001ULL, 0x5100019200501ULL,
|
||||
0x101000208001005ULL, 0x2008450080702ULL, 0x1002080301d00cULL,
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0x410201ce5c030092ULL
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};
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const int BShift[64] = {
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58, 59, 59, 59, 59, 59, 59, 58, 59, 59, 59, 59, 59, 59, 59, 59,
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59, 59, 57, 57, 57, 57, 59, 59, 59, 59, 57, 55, 55, 57, 59, 59,
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@@ -187,7 +88,85 @@ const int BShift[64] = {
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59, 59, 59, 59, 59, 59, 59, 59, 58, 59, 59, 59, 59, 59, 59, 58
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};
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#endif // defined(USE_32BIT_ATTACKS)
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const int RShift[64] = {
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52, 53, 53, 53, 53, 53, 53, 52, 53, 54, 54, 54, 54, 54, 54, 53,
|
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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
|
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};
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#else // if !defined(IS_64BIT)
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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,
|
||||
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,
|
||||
};
|
||||
|
||||
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,
|
||||
21, 22, 22, 22, 22, 22, 22, 21, 21, 22, 22, 22, 22, 22, 22, 21,
|
||||
21, 22, 22, 22, 22, 22, 22, 21, 20, 21, 21, 21, 21, 21, 21, 20
|
||||
};
|
||||
|
||||
#endif
|
||||
|
||||
|
||||
Bitboard RMask[64];
|
||||
int RAttackIndex[64];
|
||||
Bitboard RAttacks[0x19000];
|
||||
|
||||
Bitboard BMask[64];
|
||||
int BAttackIndex[64];
|
||||
@@ -226,9 +205,6 @@ 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
|
||||
}
|
||||
|
||||
|
||||
@@ -260,41 +236,25 @@ 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)
|
||||
|
||||
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
|
||||
};
|
||||
|
||||
|
||||
/// first_1() finds the least significant nonzero bit in a nonzero bitboard.
|
||||
|
||||
Square first_1(Bitboard b) {
|
||||
b ^= (b - 1);
|
||||
uint32_t fold = int(b) ^ int(b >> 32);
|
||||
return Square(BitTable[(fold * 0x783a9b23) >> 26]);
|
||||
}
|
||||
|
||||
|
||||
/// pop_1st_bit() finds and clears the least significant nonzero bit in a
|
||||
/// nonzero bitboard.
|
||||
|
||||
#if defined(USE_32BIT_ATTACKS)
|
||||
#if defined(IS_64BIT)
|
||||
|
||||
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]);
|
||||
}
|
||||
|
||||
#else
|
||||
|
||||
// Use type-punning
|
||||
union b_union {
|
||||
@@ -329,46 +289,8 @@ Square pop_1st_bit(Bitboard *bb) {
|
||||
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);
|
||||
*b &= (*b - 1);
|
||||
return Square(BitTable[(fold * 0x783a9b23) >> 26]);
|
||||
}
|
||||
|
||||
#endif
|
||||
|
||||
#else // defined(USE_FOLDED_BITSCAN)
|
||||
|
||||
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
|
||||
};
|
||||
|
||||
|
||||
/// first_1() finds the least significant nonzero bit in a nonzero bitboard.
|
||||
|
||||
Square first_1(Bitboard b) {
|
||||
return Square(BitTable[((b & -b) * 0x218a392cd3d5dbfULL) >> 58]);
|
||||
}
|
||||
|
||||
|
||||
/// 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 &= (*b - 1);
|
||||
return Square(BitTable[((bb & -bb) * 0x218a392cd3d5dbfULL) >> 58]);
|
||||
}
|
||||
|
||||
#endif // defined(USE_FOLDED_BITSCAN)
|
||||
|
||||
|
||||
namespace {
|
||||
|
||||
// All functions below are used to precompute various bitboards during
|
||||
@@ -481,25 +403,25 @@ namespace {
|
||||
attackIndex[i] = index;
|
||||
mask[i] = sliding_attacks(i, 0ULL, 4, deltas, 1, 6, 1, 6);
|
||||
|
||||
#if defined(USE_32BIT_ATTACKS)
|
||||
j = (1 << (32 - shift[i]));
|
||||
#else
|
||||
#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 + ((b * mult[i]) >> shift[i])] =
|
||||
sliding_attacks(i, b, 4, deltas);
|
||||
#else
|
||||
b = index_to_bitboard(k, mask[i]);
|
||||
attacks[index +
|
||||
(unsigned(int(b) * int(mult[i]) ^
|
||||
int(b >> 32) * int(mult[i] >> 32))
|
||||
>> shift[i])] =
|
||||
sliding_attacks(i, b, 4, deltas);
|
||||
#else
|
||||
b = index_to_bitboard(k, mask[i]);
|
||||
attacks[index + ((b * mult[i]) >> shift[i])] =
|
||||
sliding_attacks(i, b, 4, deltas);
|
||||
#endif
|
||||
}
|
||||
index += j;
|
||||
@@ -516,29 +438,4 @@ 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<<j)) b1 |= (1ULL << ((j+1)*(1+m*7)));
|
||||
for(j = 0; j < 8; j++) {
|
||||
b2 = 0ULL;
|
||||
for(k = 0, s = 1; k < 2; k++, s *= -1) {
|
||||
for(l = j+s; l >= 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)
|
||||
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user