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Consolidate all attacks bitboards

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This is a non-functional simplification that simplifies getting attacks bitboards.

* consolidates all attacks to attacks_bb (remove Position::attacks_from(..)).
* attacks_bb<PieceType>(square) gets pseudo attacks
* attacks_bb<PieceType>(square, bitboard) gets attacks considering occupied squares in the bitboard).
* pawn_attacks_bb(Color, Square) gets pawn attacks like other pawn attack bitboards.
* Wraps all access to PawnAttacks arrays and PseudoAttacks arrays and adds asserts as appropriate.

Passed STC
LLR: 2.95 (-2.94,2.94) {-1.50,0.50}
Total: 90208 W: 17533 L: 17482 D: 55193
Ptnml(0-2): 1412, 10232, 21798, 10217, 1445
https://tests.stockfishchess.org/tests/view/5ece996275787cc0c05d9790

closes https://github.com/official-stockfish/Stockfish/pull/2703

No functional change
This commit is contained in:
protonspring
2020-05-28 09:48:31 -06:00
committed by Joost VandeVondele
parent fb8095718b
commit a5e3b4edde
8 changed files with 76 additions and 72 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
src/bitbase.cpp
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@@ -112,7 +112,7 @@ namespace {
if ( distance(ksq[WHITE], ksq[BLACK]) <= 1
|| ksq[WHITE] == psq
|| ksq[BLACK] == psq
|| (stm == WHITE && (PawnAttacks[WHITE][psq] & ksq[BLACK])))
|| (stm == WHITE && (pawn_attacks_bb(WHITE, psq) & ksq[BLACK])))
result = INVALID;
// Immediate win if a pawn can be promoted without getting captured
@@ -120,13 +120,13 @@ namespace {
&& rank_of(psq) == RANK_7
&& ksq[stm] != psq + NORTH
&& ( distance(ksq[~stm], psq + NORTH) > 1
|| (PseudoAttacks[KING][ksq[stm]] & (psq + NORTH))))
|| (attacks_bb<KING>(ksq[stm]) & (psq + NORTH))))
result = WIN;
// Immediate draw if it is a stalemate or a king captures undefended pawn
else if ( stm == BLACK
&& ( !(PseudoAttacks[KING][ksq[stm]] & ~(PseudoAttacks[KING][ksq[~stm]] | PawnAttacks[~stm][psq]))
|| (PseudoAttacks[KING][ksq[stm]] & psq & ~PseudoAttacks[KING][ksq[~stm]])))
&& ( !(attacks_bb<KING>(ksq[stm]) & ~(attacks_bb<KING>(ksq[~stm]) | pawn_attacks_bb(~stm, psq)))
|| (attacks_bb<KING>(ksq[stm]) & psq & ~attacks_bb<KING>(ksq[~stm]))))
result = DRAW;
// Position will be classified later
@@ -149,7 +149,7 @@ namespace {
const Result Bad = (stm == WHITE ? DRAW : WIN);
Result r = INVALID;
Bitboard b = PseudoAttacks[KING][ksq[stm]];
Bitboard b = attacks_bb<KING>(ksq[stm]);
while (b)
r |= stm == WHITE ? db[index(BLACK, ksq[BLACK] , pop_lsb(&b), psq)]