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Space inflate movegen.cpp

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Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2008-10-17 15:11:19 +02:00
parent cf8ee79b76
commit 158911425b
2 changed files with 228 additions and 250 deletions
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466
src/movegen.cpp
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@@ -32,21 +32,16 @@
namespace {
int generate_white_pawn_captures(const Position &pos, MoveStack *mlist);
int generate_black_pawn_captures(const Position &pos, MoveStack *mlist);
int generate_white_pawn_noncaptures(const Position &pos, MoveStack *mlist);
int generate_black_pawn_noncaptures(const Position &pos, MoveStack *mlist);
int generate_knight_moves(const Position &pos, MoveStack *mlist,
Color side, Bitboard target);
int generate_bishop_moves(const Position &pos, MoveStack *mlist,
Color side, Bitboard target);
int generate_rook_moves(const Position &pos, MoveStack *mlist,
Color side, Bitboard target);
int generate_queen_moves(const Position &pos, MoveStack *mlist,
Color side, Bitboard target);
int generate_king_moves(const Position &pos, MoveStack *mlist,
Square from, Bitboard target);
int generate_castle_moves(const Position &pos, MoveStack *mlist, Color us);
int generate_white_pawn_captures(const Position&, MoveStack*);
int generate_black_pawn_captures(const Position&, MoveStack*);
int generate_white_pawn_noncaptures(const Position&, MoveStack*);
int generate_black_pawn_noncaptures(const Position&, MoveStack*);
int generate_knight_moves(const Position&, MoveStack*, Color side, Bitboard t);
int generate_bishop_moves(const Position&, MoveStack*, Color side, Bitboard t);
int generate_rook_moves(const Position&, MoveStack*, Color side, Bitboard t);
int generate_queen_moves(const Position&, MoveStack*, Color side, Bitboard t);
int generate_king_moves(const Position&, MoveStack*, Square from, Bitboard t);
int generate_castle_moves(const Position&, MoveStack*, Color us);
}
@@ -59,24 +54,25 @@ namespace {
/// generate_captures generates() all pseudo-legal captures and queen
/// promotions. The return value is the number of moves generated.
int generate_captures(const Position &pos, MoveStack *mlist) {
Color us = pos.side_to_move();
Bitboard target = pos.pieces_of_color(opposite_color(us));
int n = 0;
int generate_captures(const Position& pos, MoveStack* mlist) {
assert(pos.is_ok());
assert(!pos.is_check());
if(us == WHITE)
n += generate_white_pawn_captures(pos, mlist);
Color us = pos.side_to_move();
Bitboard target = pos.pieces_of_color(opposite_color(us));
int n;
if (us == WHITE)
n = generate_white_pawn_captures(pos, mlist);
else
n += generate_black_pawn_captures(pos, mlist);
n = generate_black_pawn_captures(pos, mlist);
n += generate_knight_moves(pos, mlist+n, us, target);
n += generate_bishop_moves(pos, mlist+n, us, target);
n += generate_rook_moves(pos, mlist+n, us, target);
n += generate_queen_moves(pos, mlist+n, us, target);
n += generate_king_moves(pos, mlist+n, pos.king_square(us), target);
return n;
}
@@ -84,25 +80,26 @@ int generate_captures(const Position &pos, MoveStack *mlist) {
/// generate_noncaptures() generates all pseudo-legal non-captures and
/// underpromotions. The return value is the number of moves generated.
int generate_noncaptures(const Position &pos, MoveStack *mlist) {
Color us = pos.side_to_move();
Bitboard target = pos.empty_squares();
int n = 0;
int generate_noncaptures(const Position& pos, MoveStack *mlist) {
assert(pos.is_ok());
assert(!pos.is_check());
if(us == WHITE)
n += generate_white_pawn_noncaptures(pos, mlist);
Color us = pos.side_to_move();
Bitboard target = pos.empty_squares();
int n;
if (us == WHITE)
n = generate_white_pawn_noncaptures(pos, mlist);
else
n += generate_black_pawn_noncaptures(pos, mlist);
n = generate_black_pawn_noncaptures(pos, mlist);
n += generate_knight_moves(pos, mlist+n, us, target);
n += generate_bishop_moves(pos, mlist+n, us, target);
n += generate_rook_moves(pos, mlist+n, us, target);
n += generate_queen_moves(pos, mlist+n, us, target);
n += generate_king_moves(pos, mlist+n, pos.king_square(us), target);
n += generate_castle_moves(pos, mlist+n, us);
return n;
}
@@ -111,15 +108,16 @@ int generate_noncaptures(const Position &pos, MoveStack *mlist) {
/// checks, except castling moves (will add this later). It returns the
/// number of generated moves.
int generate_checks(const Position &pos, MoveStack *mlist, Bitboard dc) {
int generate_checks(const Position& pos, MoveStack* mlist, Bitboard dc) {
assert(pos.is_ok());
assert(!pos.is_check());
Color us, them;
Square ksq, from, to;
Bitboard empty, checkSqs, b1, b2, b3;
int n = 0;
assert(pos.is_ok());
assert(!pos.is_check());
us = pos.side_to_move();
them = opposite_color(us);
@@ -132,7 +130,8 @@ int generate_checks(const Position &pos, MoveStack *mlist, Bitboard dc) {
// Pawn moves. This is somewhat messy, and we use separate code for white
// and black, because we can't shift by negative numbers in C/C++. :-(
if(us == WHITE) {
if (us == WHITE)
{
// Pawn moves which give discovered check. This is possible only if the
// pawn is not on the same file as the enemy king, because we don't
// generate captures.
@@ -338,15 +337,16 @@ int generate_checks(const Position &pos, MoveStack *mlist, Bitboard dc) {
/// function is very ugly, and needs cleaning up some time later. FIXME
int generate_evasions(const Position &pos, MoveStack *mlist) {
assert(pos.is_ok());
assert(pos.is_check());
Color us, them;
Bitboard checkers = pos.checkers();
Bitboard pinned, b1, b2;
Square ksq, from, to;
int n = 0;
assert(pos.is_ok());
assert(pos.is_check());
us = pos.side_to_move();
them = opposite_color(us);
@@ -575,27 +575,25 @@ int generate_evasions(const Position &pos, MoveStack *mlist) {
/// very hard to write an efficient legal move generator, but for the moment
/// we don't need it.
int generate_legal_moves(const Position &pos, MoveStack *mlist) {
int generate_legal_moves(const Position& pos, MoveStack* mlist) {
assert(pos.is_ok());
if(pos.is_check())
return generate_evasions(pos, mlist);
else {
int i, n;
Bitboard pinned = pos.pinned_pieces(pos.side_to_move());
if (pos.is_check())
return generate_evasions(pos, mlist);
// Generate pseudo-legal moves:
n = generate_captures(pos, mlist);
n += generate_noncaptures(pos, mlist + n);
// Generate pseudo-legal moves:
int n = generate_captures(pos, mlist);
n += generate_noncaptures(pos, mlist + n);
// Remove illegal moves from the list:
for(i = 0; i < n; i++) {
if(!pos.move_is_legal(mlist[i].move, pinned))
mlist[i--].move = mlist[--n].move;
}
Bitboard pinned = pos.pinned_pieces(pos.side_to_move());
return n;
}
// Remove illegal moves from the list:
for (int i = 0; i < n; i++)
if (!pos.move_is_legal(mlist[i].move, pinned))
mlist[i--].move = mlist[--n].move;
return n;
}
@@ -606,255 +604,235 @@ int generate_legal_moves(const Position &pos, MoveStack *mlist) {
/// only be used when the side to move is not in check.
Move generate_move_if_legal(const Position &pos, Move m, Bitboard pinned) {
Color us, them;
Square from, to;
Piece pc;
assert(pos.is_ok());
assert(!pos.is_check());
assert(move_is_ok(m));
us = pos.side_to_move();
them = opposite_color(us);
from = move_from(m);
pc = pos.piece_on(from);
Color us = pos.side_to_move();
Color them = opposite_color(us);
Square from = move_from(m);
Piece pc = pos.piece_on(from);
// If the from square is not occupied by a piece belonging to the side to
// move, the move is obviously not legal.
if(color_of_piece(pc) != us )
return MOVE_NONE;
to = move_to(m);
// En passant moves:
if(move_is_ep(m)) {
// The piece must be a pawn:
if(type_of_piece(pc) != PAWN)
if (color_of_piece(pc) != us)
return MOVE_NONE;
// The destination square must be the en passant square:
if(to != pos.ep_square())
return MOVE_NONE;
Square to = move_to(m);
assert(pos.square_is_empty(to));
assert(pos.piece_on(to - pawn_push(us)) == pawn_of_color(them));
// En passant moves
if (move_is_ep(m))
{
// The piece must be a pawn and destination square must be the
// en passant square.
if ( type_of_piece(pc) != PAWN
|| to != pos.ep_square())
return MOVE_NONE;
// The move is pseudo-legal. If it is legal, return it.
if(pos.move_is_legal(m))
return m;
else
return MOVE_NONE;
assert(pos.square_is_empty(to));
assert(pos.piece_on(to - pawn_push(us)) == pawn_of_color(them));
// The move is pseudo-legal. If it is legal, return it.
return (pos.move_is_legal(m) ? m : MOVE_NONE);
}
// Castling moves:
else if(move_is_short_castle(m)) {
// Castling moves
if (move_is_short_castle(m))
{
// The piece must be a king and side to move must still have
// the right to castle kingside.
if ( type_of_piece(pc) != KING
||!pos.can_castle_kingside(us))
return MOVE_NONE;
// The piece must be a king:
if(type_of_piece(pc) != KING)
return MOVE_NONE;
assert(from == pos.king_square(us));
assert(to == pos.initial_kr_square(us));
assert(pos.piece_on(to) == rook_of_color(us));
// The side to move must still have the right to castle kingside:
if(!pos.can_castle_kingside(us))
return MOVE_NONE;
Square g1 = relative_square(us, SQ_G1);
Square f1 = relative_square(us, SQ_F1);
Square s;
bool illegal = false;
assert(from == pos.king_square(us));
assert(to == pos.initial_kr_square(us));
assert(pos.piece_on(to) == rook_of_color(us));
// Check if any of the squares between king and rook
// is occupied or under attack.
for (s = Min(from, g1); s <= Max(from, g1); s++)
if ( (s != from && s != to && !pos.square_is_empty(s))
|| pos.square_is_attacked(s, them))
illegal = true;
Square g1 = relative_square(us, SQ_G1);
Square f1 = relative_square(us, SQ_F1);
Square s;
bool illegal = false;
// Check if any of the squares between king and rook
// is occupied.
for (s = Min(to, f1); s <= Max(to, f1); s++)
if (s != from && s != to && !pos.square_is_empty(s))
illegal = true;
for(s = Min(from, g1); s <= Max(from, g1); s++)
if((s != from && s != to && !pos.square_is_empty(s)) ||
pos.square_is_attacked(s, them))
illegal = true;
for(s = Min(to, f1); s <= Max(to, f1); s++)
if(s != from && s != to && !pos.square_is_empty(s))
illegal = true;
if(!illegal)
return m;
else
return MOVE_NONE;
return (!illegal ? m : MOVE_NONE);
}
else if(move_is_long_castle(m)) {
// The piece must be a king:
if(type_of_piece(pc) != KING)
return MOVE_NONE;
if (move_is_long_castle(m))
{
// The piece must be a king and side to move must still have
// the right to castle kingside.
if ( type_of_piece(pc) != KING
||!pos.can_castle_queenside(us))
return MOVE_NONE;
// The side to move must still have the right to castle kingside:
if(!pos.can_castle_queenside(us))
return MOVE_NONE;
assert(from == pos.king_square(us));
assert(to == pos.initial_qr_square(us));
assert(pos.piece_on(to) == rook_of_color(us));
assert(from == pos.king_square(us));
assert(to == pos.initial_qr_square(us));
assert(pos.piece_on(to) == rook_of_color(us));
Square c1 = relative_square(us, SQ_C1);
Square d1 = relative_square(us, SQ_D1);
Square s;
bool illegal = false;
Square c1 = relative_square(us, SQ_C1);
Square d1 = relative_square(us, SQ_D1);
Square s;
bool illegal = false;
for (s = Min(from, c1); s <= Max(from, c1); s++)
if( (s != from && s != to && !pos.square_is_empty(s))
|| pos.square_is_attacked(s, them))
illegal = true;
for(s = Min(from, c1); s <= Max(from, c1); s++)
if((s != from && s != to && !pos.square_is_empty(s)) ||
pos.square_is_attacked(s, them))
illegal = true;
for(s = Min(to, d1); s <= Max(to, d1); s++)
if(s != from && s != to && !pos.square_is_empty(s))
illegal = true;
if(square_file(to) == FILE_B &&
(pos.piece_on(to + DELTA_W) == rook_of_color(them) ||
pos.piece_on(to + DELTA_W) == queen_of_color(them)))
illegal = true;
for (s = Min(to, d1); s <= Max(to, d1); s++)
if(s != from && s != to && !pos.square_is_empty(s))
illegal = true;
if(!illegal)
return m;
else
return MOVE_NONE;
if ( square_file(to) == FILE_B
&& ( pos.piece_on(to + DELTA_W) == rook_of_color(them)
|| pos.piece_on(to + DELTA_W) == queen_of_color(them)))
illegal = true;
return (!illegal ? m : MOVE_NONE);
}
// Normal moves
else {
// The destination square cannot be occupied by a friendly piece:
if(pos.color_of_piece_on(to) == us)
// The destination square cannot be occupied by a friendly piece
if (pos.color_of_piece_on(to) == us)
return MOVE_NONE;
// Proceed according to the type of the moving piece.
switch(type_of_piece(pc)) {
// Proceed according to the type of the moving piece.
switch(type_of_piece(pc)) {
case PAWN:
case PAWN:
// Pawn moves, as usual, are somewhat messy.
if(us == WHITE) {
// If the destination square is on the 8th rank, the move must be a
// promotion.
if(square_rank(to) == RANK_8 && !move_promotion(m))
return MOVE_NONE;
if (us == WHITE)
{
// If the destination square is on the 8th rank, the move must
// be a promotion.
if (square_rank(to) == RANK_8 && !move_promotion(m))
return MOVE_NONE;
// Proceed according to the square delta between the source and
// destionation squares.
switch(to - from) {
case DELTA_NW: case DELTA_NE:
// Capture. The destination square must be occupied by an enemy piece
// (en passant captures was handled earlier).
if(pos.color_of_piece_on(to) != them)
return MOVE_NONE;
break;
// Proceed according to the square delta between the source and
// destionation squares.
switch (to - from)
{
case DELTA_NW:
case DELTA_NE:
// Capture. The destination square must be occupied by an enemy
// piece (en passant captures was handled earlier).
if (pos.color_of_piece_on(to) != them)
return MOVE_NONE;
break;
case DELTA_N:
// Pawn push. The destination square must be empty.
if(!pos.square_is_empty(to))
return MOVE_NONE;
break;
case DELTA_N:
// Pawn push. The destination square must be empty.
if (!pos.square_is_empty(to))
return MOVE_NONE;
break;
case DELTA_NN:
case DELTA_NN:
// Double pawn push. The destination square must be on the fourth
// rank, and both the destination square and the square between the
// source and destination squares must be empty.
if(square_rank(to) != RANK_4 || !pos.square_is_empty(to) ||
!pos.square_is_empty(from + DELTA_N))
return MOVE_NONE;
break;
if ( square_rank(to) != RANK_4
|| !pos.square_is_empty(to)
|| !pos.square_is_empty(from + DELTA_N))
return MOVE_NONE;
break;
default:
return MOVE_NONE;
default:
return MOVE_NONE;
}
}
else { // (us == BLACK)
// If the destination square is on the 1st rank, the move must be a
// promotion.
if(square_rank(to) == RANK_1 && !move_promotion(m))
return MOVE_NONE;
else // (us == BLACK)
{
// If the destination square is on the 1th rank, the move must
// be a promotion.
if (square_rank(to) == RANK_1 && !move_promotion(m))
return MOVE_NONE;
// Proceed according to the square delta between the source and
// destionation squares.
switch(to - from) {
// Proceed according to the square delta between the source and
// destionation squares.
switch (to - from)
{
case DELTA_SW:
case DELTA_SE:
// Capture. The destination square must be occupied by an enemy
// piece (en passant captures was handled earlier).
if (pos.color_of_piece_on(to) != them)
return MOVE_NONE;
break;
case DELTA_SW: case DELTA_SE:
// Capture. The destination square must be occupied by an enemy piece
// (en passant captures was handled earlier).
if(pos.color_of_piece_on(to) != them)
return MOVE_NONE;
break;
case DELTA_S:
// Pawn push. The destination square must be empty.
if (!pos.square_is_empty(to))
return MOVE_NONE;
break;
case DELTA_S:
// Pawn push. The destination square must be empty.
if(!pos.square_is_empty(to))
return MOVE_NONE;
break;
case DELTA_SS:
case DELTA_SS:
// Double pawn push. The destination square must be on the fifth
// rank, and both the destination square and the square between the
// source and destination squares must be empty.
if(square_rank(to) != RANK_5 || !pos.square_is_empty(to) ||
!pos.square_is_empty(from + DELTA_S))
return MOVE_NONE;
break;
if ( square_rank(to) != RANK_5
|| !pos.square_is_empty(to)
|| !pos.square_is_empty(from + DELTA_S))
return MOVE_NONE;
break;
default:
return MOVE_NONE;
}
default:
return MOVE_NONE;
}
}
// The move is pseudo-legal. Return it if it is legal.
if(pos.move_is_legal(m))
return m;
else
return MOVE_NONE;
return (pos.move_is_legal(m) ? m : MOVE_NONE);
break;
case KNIGHT:
if(pos.knight_attacks_square(from, to) && pos.move_is_legal(m) &&
!move_promotion(m))
return m;
else
return MOVE_NONE;
break;
case KNIGHT:
return ( pos.knight_attacks_square(from, to)
&& pos.move_is_legal(m)
&& !move_promotion(m) ? m : MOVE_NONE);
break;
case BISHOP:
if(pos.bishop_attacks_square(from, to) && pos.move_is_legal(m) &&
!move_promotion(m))
return m;
else
return MOVE_NONE;
break;
case BISHOP:
return ( pos.bishop_attacks_square(from, to)
&& pos.move_is_legal(m)
&& !move_promotion(m) ? m : MOVE_NONE);
break;
case ROOK:
if(pos.rook_attacks_square(from, to) && pos.move_is_legal(m) &&
!move_promotion(m))
return m;
else
return MOVE_NONE;
break;
case ROOK:
return ( pos.rook_attacks_square(from, to)
&& pos.move_is_legal(m)
&& !move_promotion(m) ? m : MOVE_NONE);
break;
case QUEEN:
if(pos.queen_attacks_square(from, to) && pos.move_is_legal(m) &&
!move_promotion(m))
return m;
else
return MOVE_NONE;
break;
case QUEEN:
return ( pos.queen_attacks_square(from, to)
&& pos.move_is_legal(m)
&& !move_promotion(m) ? m : MOVE_NONE);
break;
case KING:
if(pos.king_attacks_square(from, to) && pos.move_is_legal(m) &&
!move_promotion(m))
return m;
else
return MOVE_NONE;
break;
case KING:
return ( pos.king_attacks_square(from, to)
&& pos.move_is_legal(m)
&& !move_promotion(m) ? m : MOVE_NONE);
break;
default:
assert(false);
default:
assert(false);
}
}
assert(false);
return MOVE_NONE;
assert(false);
return MOVE_NONE;
}