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Code Issues Releases Wiki Activity

Retire generate_pawn_captures()

Browse source 
And unify in generate_pawn_noncaptures() renamed
generate_pawn_moves()

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2009-09-23 11:18:04 +01:00
parent 4346445be3
commit 20cac227bb
1 changed files with 51 additions and 72 deletions
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111
src/movegen.cpp
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@ -59,14 +59,11 @@ namespace {
template<CastlingSide Side>
MoveStack* generate_castle_moves(const Position&, MoveStack*);
template<Color Us>
MoveStack* generate_pawn_captures(const Position&, MoveStack*);
template<Color Us, SquareDelta Diagonal>
MoveStack* generate_pawn_captures_diagonal(MoveStack*, Bitboard, Bitboard, bool);
template<Color Us, MoveType Type>
MoveStack* generate_pawn_noncaptures(const Position&, MoveStack*, Bitboard = EmptyBoardBB,
MoveStack* generate_pawn_moves(const Position&, MoveStack*, Bitboard = EmptyBoardBB,
Square = SQ_NONE, Bitboard = EmptyBoardBB);
template<Color Us, SquareDelta Direction>
@ -89,8 +86,8 @@ namespace {
template<>
inline MoveStack* generate_piece_checks<PAWN>(const Position& p, MoveStack* m, Color us, Bitboard dc, Square ksq) {
return (us == WHITE ? generate_pawn_noncaptures<WHITE, CHECK>(p, m, dc, ksq)
: generate_pawn_noncaptures<BLACK, CHECK>(p, m, dc, ksq));
return (us == WHITE ? generate_pawn_moves<WHITE, CHECK>(p, m, dc, ksq)
: generate_pawn_moves<BLACK, CHECK>(p, m, dc, ksq));
}
// Template generate_piece_moves() with specializations and overloads
@ -104,13 +101,10 @@ namespace {
inline MoveStack* generate_piece_moves(const Position& p, MoveStack* m, Color us) {
assert(Piece == PAWN);
assert(Type == CAPTURE || Type == NON_CAPTURE);
if (Type == CAPTURE)
return (us == WHITE ? generate_pawn_captures<WHITE>(p, m)
: generate_pawn_captures<BLACK>(p, m));
else
return (us == WHITE ? generate_pawn_noncaptures<WHITE, NON_CAPTURE>(p, m)
: generate_pawn_noncaptures<BLACK, NON_CAPTURE>(p, m));
return (us == WHITE ? generate_pawn_moves<WHITE, Type>(p, m)
: generate_pawn_moves<BLACK, Type>(p, m));
}
template<PieceType>
@ -120,8 +114,8 @@ namespace {
inline MoveStack* generate_piece_moves<PAWN>(const Position& p, MoveStack* m,
Color us, Bitboard t, Bitboard pnd) {
return (us == WHITE ? generate_pawn_noncaptures<WHITE, EVASION>(p, m, pnd, SQ_NONE, t)
: generate_pawn_noncaptures<BLACK, EVASION>(p, m, pnd, SQ_NONE, t));
return (us == WHITE ? generate_pawn_moves<WHITE, EVASION>(p, m, pnd, SQ_NONE, t)
: generate_pawn_moves<BLACK, EVASION>(p, m, pnd, SQ_NONE, t));
}
}
@ -568,55 +562,8 @@ namespace {
return mlist;
}
template<Color Us>
MoveStack* generate_pawn_captures(const Position& pos, MoveStack* mlist) {
// Calculate our parametrized parameters at compile time
const Color Them = (Us == WHITE ? BLACK : WHITE);
const Bitboard TRank8BB = (Us == WHITE ? Rank8BB : Rank1BB);
const Bitboard TRank7BB = (Us == WHITE ? Rank7BB : Rank2BB);
const SquareDelta TDELTA_N = (Us == WHITE ? DELTA_N : DELTA_S);
Square to;
Bitboard pawns = pos.pieces(PAWN, Us);
Bitboard enemyPieces = pos.pieces_of_color(opposite_color(Us));
bool possiblePromotion = (pawns & TRank7BB);
// Standard captures and capturing promotions in both directions
mlist = generate_pawn_captures_diagonal<Us, DELTA_NE>(mlist, pawns, enemyPieces, possiblePromotion);
mlist = generate_pawn_captures_diagonal<Us, DELTA_NW>(mlist, pawns, enemyPieces, possiblePromotion);
// Non-capturing promotions
if (possiblePromotion)
{
Bitboard b1 = move_pawns<Us, DELTA_N>(pawns) & pos.empty_squares() & TRank8BB;
while (b1)
{
to = pop_1st_bit(&b1);
(*mlist++).move = make_promotion_move(to - TDELTA_N, to, QUEEN);
}
}
// En passant captures
if (pos.ep_square() != SQ_NONE)
{
assert(Us != WHITE || square_rank(pos.ep_square()) == RANK_6);
assert(Us != BLACK || square_rank(pos.ep_square()) == RANK_3);
Bitboard b1 = pawns & pos.attacks_from<PAWN>(pos.ep_square(), Them);
assert(b1 != EmptyBoardBB);
while (b1)
{
to = pop_1st_bit(&b1);
(*mlist++).move = make_ep_move(to, pos.ep_square());
}
}
return mlist;
}
template<Color Us, MoveType Type>
MoveStack* generate_pawn_noncaptures(const Position& pos, MoveStack* mlist, Bitboard dcp,
MoveStack* generate_pawn_moves(const Position& pos, MoveStack* mlist, Bitboard dcp,
Square ksq, Bitboard blockSquares) {
// Calculate our parametrized parameters at compile time
@ -632,15 +579,24 @@ namespace {
Square to;
Bitboard pawns = (Type != EVASION ? pos.pieces(PAWN, Us) : pos.pieces(PAWN, Us) & ~dcp);
Bitboard emptySquares = pos.empty_squares();
bool possiblePromotion = (pawns & TRank7BB);
if (pawns & TRank7BB) // There is some promotion candidate ?
if (Type == CAPTURE)
{
// Standard captures and capturing promotions in both directions
Bitboard enemyPieces = pos.pieces_of_color(opposite_color(Us));
mlist = generate_pawn_captures_diagonal<Us, DELTA_NE>(mlist, pawns, enemyPieces, possiblePromotion);
mlist = generate_pawn_captures_diagonal<Us, DELTA_NW>(mlist, pawns, enemyPieces, possiblePromotion);
}
if (possiblePromotion)
{
// When generating checks consider under-promotion moves (both captures
// and non captures) only if can give a discovery check. Note that dcp
// is dc bitboard or pinned bitboard when Type == EVASION.
Bitboard pp = (Type == CHECK ? pawns & dcp : pawns);
if (Type != EVASION)
if (Type != EVASION && Type != CAPTURE)
{
Bitboard enemyPieces = pos.pieces_of_color(opposite_color(Us));
@ -665,21 +621,44 @@ namespace {
}
}
// Underpromotion pawn pushes
// Underpromotion pawn pushes. Also promotion for evasions and captures.
b1 = move_pawns<Us, DELTA_N>(pp) & TRank8BB;
b1 &= (Type == EVASION ? blockSquares : emptySquares);
while (b1)
{
to = pop_1st_bit(&b1);
if (Type == EVASION)
if (Type == EVASION || Type == CAPTURE)
(*mlist++).move = make_promotion_move(to - TDELTA_N, to, QUEEN);
if (Type != CAPTURE)
{
(*mlist++).move = make_promotion_move(to - TDELTA_N, to, ROOK);
(*mlist++).move = make_promotion_move(to - TDELTA_N, to, BISHOP);
(*mlist++).move = make_promotion_move(to - TDELTA_N, to, KNIGHT);
}
}
}
if (Type == CAPTURE)
{
// En passant captures
if (pos.ep_square() != SQ_NONE)
{
assert(Us != WHITE || square_rank(pos.ep_square()) == RANK_6);
assert(Us != BLACK || square_rank(pos.ep_square()) == RANK_3);
Bitboard b1 = pawns & pos.attacks_from<PAWN>(pos.ep_square(), Them);
assert(b1 != EmptyBoardBB);
while (b1)
{
to = pop_1st_bit(&b1);
(*mlist++).move = make_ep_move(to, pos.ep_square());
}
}
return mlist;
}
dcPawns1 = dcPawns2 = EmptyBoardBB;
if (Type == CHECK && (pawns & dcp))