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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/endgame.cpp
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@@ -391,8 +391,8 @@ ScaleFactor Endgame<KQKRPs>::operator()(const Position& pos) const {
&& relative_rank(weakSide, pos.square<KING>(strongSide)) >= RANK_4
&& relative_rank(weakSide, rsq) == RANK_3
&& ( pos.pieces(weakSide, PAWN)
& pos.attacks_from<KING>(kingSq)
& pos.attacks_from<PAWN>(rsq, strongSide)))
& attacks_bb<KING>(kingSq)
& pawn_attacks_bb(strongSide, rsq)))
return SCALE_FACTOR_DRAW;
return SCALE_FACTOR_NONE;
@@ -535,7 +535,7 @@ ScaleFactor Endgame<KRPKB>::operator()(const Position& pos) const {
// the corner
if ( rk == RANK_6
&& distance(psq + 2 * push, ksq) <= 1
&& (PseudoAttacks[BISHOP][bsq] & (psq + push))
&& (attacks_bb<BISHOP>(bsq) & (psq + push))
&& distance<File>(bsq, psq) >= 2)
return ScaleFactor(8);
}
@@ -670,14 +670,14 @@ ScaleFactor Endgame<KBPPKB>::operator()(const Position& pos) const {
if ( ksq == blockSq1
&& opposite_colors(ksq, wbsq)
&& ( bbsq == blockSq2
|| (pos.attacks_from<BISHOP>(blockSq2) & pos.pieces(weakSide, BISHOP))
|| (attacks_bb<BISHOP>(blockSq2, pos.pieces()) & pos.pieces(weakSide, BISHOP))
|| distance<Rank>(psq1, psq2) >= 2))
return SCALE_FACTOR_DRAW;
else if ( ksq == blockSq2
&& opposite_colors(ksq, wbsq)
&& ( bbsq == blockSq1
|| (pos.attacks_from<BISHOP>(blockSq1) & pos.pieces(weakSide, BISHOP))))
|| (attacks_bb<BISHOP>(blockSq1, pos.pieces()) & pos.pieces(weakSide, BISHOP))))
return SCALE_FACTOR_DRAW;
else
return SCALE_FACTOR_NONE;