Small code-style touches in movegen.cpp
No functional change. Signed-off-by: Marco Costalba <mcostalba@gmail.com>sf_2.3.1_base
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82a1e2d5fc
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7a68916ff9
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@ -79,7 +79,7 @@ namespace {
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// Templates for non-capture checks generation
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template<PieceType Piece>
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MoveStack* generate_discovered_checks(const Position& pos, MoveStack* mlist, Square from);
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MoveStack* generate_discovered_checks(const Position&, MoveStack*, Square);
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template<PieceType>
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MoveStack* generate_direct_checks(const Position&, MoveStack*, Color, Bitboard, Square);
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@ -148,17 +148,19 @@ MoveStack* generate_non_capture_checks(const Position& pos, MoveStack* mlist) {
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assert(pos.is_ok());
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assert(!pos.is_check());
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Bitboard b, dc;
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Square from;
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Color us = pos.side_to_move();
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Square ksq = pos.king_square(opposite_color(us));
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Bitboard dc = pos.discovered_check_candidates(us);
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assert(pos.piece_on(ksq) == piece_of_color_and_type(opposite_color(us), KING));
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// Discovered non-capture checks
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Bitboard b = dc;
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b = dc = pos.discovered_check_candidates(us);
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while (b)
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{
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Square from = pop_1st_bit(&b);
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from = pop_1st_bit(&b);
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switch (pos.type_of_piece_on(from))
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{
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case PAWN: /* Will be generated togheter with pawns direct checks */ break;
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@ -187,7 +189,7 @@ MoveStack* generate_evasions(const Position& pos, MoveStack* mlist) {
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assert(pos.is_ok());
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assert(pos.is_check());
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Bitboard b;
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Bitboard b, target;
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Square from, checksq;
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int checkersCnt = 0;
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Color us = pos.side_to_move();
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@ -236,7 +238,7 @@ MoveStack* generate_evasions(const Position& pos, MoveStack* mlist) {
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// Find squares where a blocking evasion or a capture of the
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// checker piece is possible.
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Bitboard target = squares_between(checksq, ksq) | checkers;
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target = squares_between(checksq, ksq) | checkers;
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mlist = generate_piece_moves<PAWN, EVASION>(pos, mlist, us, target);
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mlist = generate_piece_moves<KNIGHT>(pos, mlist, us, target);
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@ -254,26 +256,25 @@ MoveStack* generate_moves(const Position& pos, MoveStack* mlist, bool pseudoLega
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assert(pos.is_ok());
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MoveStack* last;
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MoveStack *last, *cur = mlist;
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Bitboard pinned = pos.pinned_pieces(pos.side_to_move());
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// Generate pseudo-legal moves
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if (pos.is_check())
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last = generate_evasions(pos, mlist);
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else {
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last = generate_captures(pos, mlist);
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last = generate_noncaptures(pos, last);
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}
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else
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last = generate_noncaptures(pos, generate_captures(pos, mlist));
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if (pseudoLegal)
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return last;
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// Remove illegal moves from the list
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for (MoveStack* cur = mlist; cur != last; cur++)
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if (!pos.pl_move_is_legal(cur->move, pinned))
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{
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while (cur != last)
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if (pos.pl_move_is_legal(cur->move, pinned))
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cur++;
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else
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cur->move = (--last)->move;
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cur--;
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}
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return last;
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}
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@ -285,8 +286,9 @@ MoveStack* generate_moves(const Position& pos, MoveStack* mlist, bool pseudoLega
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bool move_is_legal(const Position& pos, const Move m) {
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MoveStack mlist[256];
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MoveStack* last = generate_moves(pos, mlist, true);
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for (MoveStack* cur = mlist; cur != last; cur++)
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MoveStack *cur, *last = generate_moves(pos, mlist, true);
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for (cur = mlist; cur != last; cur++)
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if (cur->move == m)
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return pos.pl_move_is_legal(m, pos.pinned_pieces(pos.side_to_move()));
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@ -303,16 +305,16 @@ bool move_is_legal(const Position& pos, const Move m, Bitboard pinned) {
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assert(move_is_ok(m));
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assert(pinned == pos.pinned_pieces(pos.side_to_move()));
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// Use a slower but simpler function for uncommon cases
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if (move_is_ep(m) || move_is_castle(m))
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return move_is_legal(pos, m);
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Color us = pos.side_to_move();
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Color them = opposite_color(us);
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Square from = move_from(m);
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Square to = move_to(m);
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Piece pc = pos.piece_on(from);
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// Use a slower but simpler function for uncommon cases
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if (move_is_ep(m) || move_is_castle(m))
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return move_is_legal(pos, m);
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// If the from square is not occupied by a piece belonging to the side to
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// move, the move is obviously not legal.
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if (color_of_piece(pc) != us)
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@ -396,8 +398,8 @@ namespace {
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template<PieceType Piece>
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MoveStack* generate_piece_moves(const Position& pos, MoveStack* mlist, Color us, Bitboard target) {
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Square from;
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Bitboard b;
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Square from;
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const Square* ptr = pos.piece_list_begin(us, Piece);
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while ((from = *ptr++) != SQ_NONE)
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@ -433,7 +435,7 @@ namespace {
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}
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template<Color Us, MoveType Type, SquareDelta Diagonal>
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inline MoveStack* generate_pawn_captures(MoveStack* mlist, Bitboard pawns, Bitboard enemyPieces, bool possiblePromotion) {
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inline MoveStack* generate_pawn_captures(MoveStack* mlist, Bitboard pawns, Bitboard enemyPieces) {
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// Calculate our parametrized parameters at compile time
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const Bitboard TRank8BB = (Us == WHITE ? Rank8BB : Rank1BB);
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@ -442,15 +444,16 @@ namespace {
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const SquareDelta TDELTA_NW = (Us == WHITE ? DELTA_NW : DELTA_SW);
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const SquareDelta TTDELTA_NE = (Diagonal == DELTA_NE ? TDELTA_NE : TDELTA_NW);
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Bitboard b1, b2;
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Square to;
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// Captures in the a1-h8 (a8-h1 for black) diagonal or in the h1-a8 (h8-a1 for black)
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Bitboard b1 = move_pawns<Us, Diagonal>(pawns) & ~TFileABB & enemyPieces;
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b1 = move_pawns<Us, Diagonal>(pawns) & ~TFileABB & enemyPieces;
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// Capturing promotions and under-promotions
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if (possiblePromotion)
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if (b1 & TRank8BB)
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{
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Bitboard b2 = b1 & TRank8BB;
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b2 = b1 & TRank8BB;
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b1 &= ~TRank8BB;
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while (b2)
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{
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@ -494,22 +497,21 @@ namespace {
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Square to;
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Bitboard b1, b2, enemyPieces, emptySquares;
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Bitboard pawns = pos.pieces(PAWN, Us);
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bool possiblePromotion = pawns & TRank7BB;
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// Standard captures and capturing promotions and underpromotions
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if (Type == CAPTURE || Type == EVASION || possiblePromotion)
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if (Type == CAPTURE || Type == EVASION || (pawns & TRank7BB))
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{
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enemyPieces = (Type == CAPTURE ? target : pos.pieces_of_color(opposite_color(Us)));
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if (Type == EVASION)
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enemyPieces &= target; // Capture only the checker piece
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mlist = generate_pawn_captures<Us, Type, DELTA_NE>(mlist, pawns, enemyPieces, possiblePromotion);
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mlist = generate_pawn_captures<Us, Type, DELTA_NW>(mlist, pawns, enemyPieces, possiblePromotion);
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mlist = generate_pawn_captures<Us, Type, DELTA_NE>(mlist, pawns, enemyPieces);
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mlist = generate_pawn_captures<Us, Type, DELTA_NW>(mlist, pawns, enemyPieces);
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}
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// Non-capturing promotions and underpromotions
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if (possiblePromotion)
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if (pawns & TRank7BB)
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{
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b1 = move_pawns<Us, DELTA_N>(pawns) & TRank8BB & pos.empty_squares();
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@ -619,8 +621,8 @@ namespace {
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Bitboard dc, Square ksq) {
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assert(Piece != KING);
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Bitboard checkSqs, b;
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Square from;
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Bitboard checkSqs;
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const Square* ptr = pos.piece_list_begin(us, Piece);
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if ((from = *ptr++) == SQ_NONE)
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@ -638,8 +640,8 @@ namespace {
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if (dc && bit_is_set(dc, from))
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continue;
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Bitboard bb = pos.attacks_from<Piece>(from) & checkSqs;
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SERIALIZE_MOVES(bb);
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b = pos.attacks_from<Piece>(from) & checkSqs;
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SERIALIZE_MOVES(b);
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} while ((from = *ptr++) != SQ_NONE);
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@ -77,6 +77,8 @@ MovePicker::MovePicker(const Position& p, Move ttm, Depth d,
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finished = false;
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lastBadCapture = badCaptures;
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pinned = p.pinned_pieces(pos.side_to_move());
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if (ss && !p.is_check())
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{
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ttMoves[1].move = (ss->mateKiller == ttm)? MOVE_NONE : ss->mateKiller;
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@ -86,8 +88,6 @@ MovePicker::MovePicker(const Position& p, Move ttm, Depth d,
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} else
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ttMoves[1].move = killers[0].move = killers[1].move = MOVE_NONE;
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pinned = p.pinned_pieces(pos.side_to_move());
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if (p.is_check())
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phasePtr = EvasionsPhaseTable;
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else if (d > Depth(0))
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