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Introduce generate_piece_blocking_evasions()

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Start to simplify generate_evasions

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2008-10-19 08:49:26 +01:00
parent 4a4d62da13
commit 4f18528a1c
1 changed files with 37 additions and 50 deletions
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87
src/movegen.cpp
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@ -57,10 +57,11 @@ namespace {
int generate_pawn_captures(const PawnOffsets&, const Position&, MoveStack*); int generate_pawn_captures(const PawnOffsets&, const Position&, MoveStack*);
int generate_pawn_noncaptures(const PawnOffsets&, const Position&, MoveStack*); int generate_pawn_noncaptures(const PawnOffsets&, const Position&, MoveStack*);
int generate_pawn_checks(const PawnOffsets&, const Position&, Bitboard dc, Square ksq, MoveStack*, int n); int generate_pawn_checks(const PawnOffsets&, const Position&, Bitboard, Square, MoveStack*, int);
int generate_piece_checks(PieceType pce, const Position& pos, Bitboard target, Bitboard dc, Square ksq, MoveStack* mlist, int n); int generate_piece_checks(PieceType, const Position&, Bitboard, Bitboard, Square, MoveStack*, int);
int generate_piece_moves(PieceType, const Position&, MoveStack*, Color side, Bitboard t); int generate_piece_moves(PieceType, const Position&, MoveStack*, Color, Bitboard);
int generate_castle_moves(const Position&, MoveStack*, Color us); int generate_castle_moves(const Position&, MoveStack*, Color);
int generate_piece_blocking_evasions(PieceType, const Position&, Bitboard, Bitboard, MoveStack*, int);
} }
@ -249,9 +250,9 @@ int generate_evasions(const Position& pos, MoveStack* mlist) {
} }
// Pieces captures // Pieces captures
b1 = pos.knight_attacks(checksq) & pos.knights(us) b1 = (pos.knight_attacks(checksq) & pos.knights(us))
& pos.bishop_attacks(checksq) & pos.bishops_and_queens(us) | (pos.bishop_attacks(checksq) & pos.bishops_and_queens(us))
& pos.rook_attacks(checksq) & pos.rooks_and_queens(us) | (pos.rook_attacks(checksq) & pos.rooks_and_queens(us))
& not_pinned; & not_pinned;
while (b1) while (b1)
@ -343,57 +344,24 @@ int generate_evasions(const Position& pos, MoveStack* mlist) {
} }
} }
// Knight moves // Pieces moves
b1 = pos.knights(us) & not_pinned; b1 = pos.knights(us) & not_pinned;
while (b1) if (b1)
{ n = generate_piece_blocking_evasions(KNIGHT, pos, b1, blockSquares, mlist, n);
from = pop_1st_bit(&b1);
b2 = pos.knight_attacks(from) & blockSquares;
while (b2)
{
to = pop_1st_bit(&b2);
mlist[n++].move = make_move(from, to);
}
}
// Bishop moves
b1 = pos.bishops(us) & not_pinned; b1 = pos.bishops(us) & not_pinned;
while (b1) if (b1)
{ n = generate_piece_blocking_evasions(BISHOP, pos, b1, blockSquares, mlist, n);
from = pop_1st_bit(&b1);
b2 = pos.bishop_attacks(from) & blockSquares;
while (b2)
{
to = pop_1st_bit(&b2);
mlist[n++].move = make_move(from, to);
}
}
// Rook moves // Rook moves
b1 = pos.rooks(us) & not_pinned; b1 = pos.rooks(us) & not_pinned;
while (b1) if (b1)
{ n = generate_piece_blocking_evasions(ROOK, pos, b1, blockSquares, mlist, n);
from = pop_1st_bit(&b1);
b2 = pos.rook_attacks(from) & blockSquares;
while (b2)
{
to = pop_1st_bit(&b2);
mlist[n++].move = make_move(from, to);
}
}
// Queen moves // Queen moves
b1 = pos.queens(us) & not_pinned; b1 = pos.queens(us) & not_pinned;
while (b1) if (b1)
{ n = generate_piece_blocking_evasions(QUEEN, pos, b1, blockSquares, mlist, n);
from = pop_1st_bit(&b1);
b2 = pos.queen_attacks(from) & blockSquares;
while (b2)
{
to = pop_1st_bit(&b2);
mlist[n++].move = make_move(from, to);
}
}
} }
// Finally, the ugly special case of en passant captures. An en passant // Finally, the ugly special case of en passant captures. An en passant
@ -940,4 +908,23 @@ namespace {
} }
return n; return n;
} }
int generate_piece_blocking_evasions(PieceType pce, const Position& pos, Bitboard b,
Bitboard blockSquares, MoveStack* mlist, int n) {
const Piece_attacks_fn mem_fn = piece_attacks_fn[pce];
while (b)
{
Square from = pop_1st_bit(&b);
Bitboard bb = (pos.*mem_fn)(from) & blockSquares;
while (bb)
{
Square to = pop_1st_bit(&bb);
mlist[n++].move = make_move(from, to);
}
}
return n;
}
} }