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Retire generate_pawn_blocking_evasions()

Browse source 
And unify in generate_pawn_noncaptures()

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2009-09-23 10:47:11 +01:00
parent 21850536d5
commit 4346445be3
1 changed files with 52 additions and 79 deletions
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97
src/movegen.cpp
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@ -47,7 +47,9 @@ namespace {
enum MoveType {
CAPTURE,
NON_CAPTURE
NON_CAPTURE,
CHECK,
EVASION
};
// Functions
@ -57,17 +59,15 @@ namespace {
template<CastlingSide Side>
MoveStack* generate_castle_moves(const Position&, MoveStack*);
template<Color Us>
MoveStack* generate_pawn_blocking_evasions(const Position&, Bitboard, Bitboard, 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, bool Checks>
MoveStack* generate_pawn_noncaptures(const Position&, MoveStack*, Bitboard = EmptyBoardBB, Square = SQ_NONE);
template<Color Us, MoveType Type>
MoveStack* generate_pawn_noncaptures(const Position&, MoveStack*, Bitboard = EmptyBoardBB,
Square = SQ_NONE, Bitboard = EmptyBoardBB);
template<Color Us, SquareDelta Direction>
inline Bitboard move_pawns(Bitboard p) {
@ -89,8 +89,8 @@ 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, true>(p, m, dc, ksq)
: generate_pawn_noncaptures<BLACK, true>(p, m, dc, ksq));
return (us == WHITE ? generate_pawn_noncaptures<WHITE, CHECK>(p, m, dc, ksq)
: generate_pawn_noncaptures<BLACK, CHECK>(p, m, dc, ksq));
}
// Template generate_piece_moves() with specializations and overloads
@ -109,8 +109,8 @@ namespace {
return (us == WHITE ? generate_pawn_captures<WHITE>(p, m)
: generate_pawn_captures<BLACK>(p, m));
else
return (us == WHITE ? generate_pawn_noncaptures<WHITE, false>(p, m)
: generate_pawn_noncaptures<BLACK, false>(p, m));
return (us == WHITE ? generate_pawn_noncaptures<WHITE, NON_CAPTURE>(p, m)
: generate_pawn_noncaptures<BLACK, NON_CAPTURE>(p, m));
}
template<PieceType>
@ -120,8 +120,8 @@ namespace {
inline MoveStack* generate_piece_moves<PAWN>(const Position& p, MoveStack* m,
Color us, Bitboard t, Bitboard pnd) {
return (us == WHITE ? generate_pawn_blocking_evasions<WHITE>(p, pnd, t, m)
: generate_pawn_blocking_evasions<BLACK>(p, pnd, t, m));
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));
}
}
@ -615,8 +615,9 @@ namespace {
return mlist;
}
template<Color Us, bool GenerateChecks>
MoveStack* generate_pawn_noncaptures(const Position& pos, MoveStack* mlist, Bitboard dc, Square ksq) {
template<Color Us, MoveType Type>
MoveStack* generate_pawn_noncaptures(const Position& pos, MoveStack* mlist, Bitboard dcp,
Square ksq, Bitboard blockSquares) {
// Calculate our parametrized parameters at compile time
const Color Them = (Us == WHITE ? BLACK : WHITE);
@ -629,14 +630,18 @@ namespace {
Bitboard b1, b2, dcPawns1, dcPawns2;
Square to;
Bitboard pawns = pos.pieces(PAWN, Us);
Bitboard pawns = (Type != EVASION ? pos.pieces(PAWN, Us) : pos.pieces(PAWN, Us) & ~dcp);
Bitboard emptySquares = pos.empty_squares();
if (pawns & TRank7BB) // There is some promotion candidate ?
{
// When generating checks consider under-promotion moves (both captures
// and non captures) only if can give a discovery check.
Bitboard pp = GenerateChecks ? pawns & dc : pawns;
// 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)
{
Bitboard enemyPieces = pos.pieces_of_color(opposite_color(Us));
// Underpromotion captures in the a1-h8 (a8-h1 for black) direction
@ -658,12 +663,18 @@ namespace {
(*mlist++).move = make_promotion_move(to - TDELTA_NW, to, BISHOP);
(*mlist++).move = make_promotion_move(to - TDELTA_NW, to, KNIGHT);
}
}
// Underpromotion pawn pushes
b1 = move_pawns<Us, DELTA_N>(pp) & emptySquares & TRank8BB;
b1 = move_pawns<Us, DELTA_N>(pp) & TRank8BB;
b1 &= (Type == EVASION ? blockSquares : emptySquares);
while (b1)
{
to = pop_1st_bit(&b1);
if (Type == EVASION)
(*mlist++).move = make_promotion_move(to - TDELTA_N, to, QUEEN);
(*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);
@ -671,23 +682,25 @@ namespace {
}
dcPawns1 = dcPawns2 = EmptyBoardBB;
if (GenerateChecks && (pawns & dc))
if (Type == CHECK && (pawns & dcp))
{
// Pawn moves which gives 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.
dcPawns1 = move_pawns<Us, DELTA_N>(pawns & dc & ~file_bb(ksq)) & emptySquares & ~TRank8BB;
dcPawns1 = move_pawns<Us, DELTA_N>(pawns & dcp & ~file_bb(ksq)) & emptySquares & ~TRank8BB;
dcPawns2 = move_pawns<Us, DELTA_N>(dcPawns1 & TRank3BB) & emptySquares;
}
// Single pawn pushes
b1 = move_pawns<Us, DELTA_N>(pawns) & emptySquares & ~TRank8BB;
b2 = GenerateChecks ? (b1 & pos.attacks_from<PAWN>(ksq, Them)) | dcPawns1 : b1;
b2 = (Type == CHECK ? (b1 & pos.attacks_from<PAWN>(ksq, Them)) | dcPawns1 :
(Type == EVASION ? b1 & blockSquares : b1));
SERIALIZE_MOVES_D(b2, -TDELTA_N);
// Double pawn pushes
b1 = move_pawns<Us, DELTA_N>(b1 & TRank3BB) & emptySquares;
b2 = GenerateChecks ? (b1 & pos.attacks_from<PAWN>(ksq, Them)) | dcPawns2 : b1;
b2 = (Type == CHECK ? (b1 & pos.attacks_from<PAWN>(ksq, Them)) | dcPawns2 :
(Type == EVASION ? b1 & blockSquares : b1));
SERIALIZE_MOVES_D(b2, -TDELTA_N -TDELTA_N);
return mlist;
}
@ -733,46 +746,6 @@ namespace {
return mlist;
}
template<Color Us>
MoveStack* generate_pawn_blocking_evasions(const Position& pos, Bitboard pinned,
Bitboard blockSquares, MoveStack* mlist) {
// Calculate our parametrized parameters at compile time
const Bitboard TRank8BB = (Us == WHITE ? Rank8BB : Rank1BB);
const Bitboard TRank7BB = (Us == WHITE ? Rank7BB : Rank2BB);
const Bitboard TRank3BB = (Us == WHITE ? Rank3BB : Rank6BB);
const SquareDelta TDELTA_N = (Us == WHITE ? DELTA_N : DELTA_S);
Bitboard b1, b2;
Square to;
Bitboard pawns = pos.pieces(PAWN, Us) & ~pinned;
Bitboard emptySquares = pos.empty_squares();
if (pawns & TRank7BB) // There is some promotion candidate ?
{
// Note that blockSquares are always empty
b1 = move_pawns<Us, DELTA_N>(pawns) & blockSquares & TRank8BB;
while (b1)
{
to = pop_1st_bit(&b1);
(*mlist++).move = make_promotion_move(to - TDELTA_N, to, QUEEN);
(*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);
}
}
// Single pawn pushes
b1 = move_pawns<Us, DELTA_N>(pawns) & emptySquares & ~TRank8BB;
b2 = b1 & blockSquares;
SERIALIZE_MOVES_D(b2, -TDELTA_N);
// Double pawn pushes. Note that blockSquares are always empty
b1 = move_pawns<Us, DELTA_N>(b1 & TRank3BB) & blockSquares;
SERIALIZE_MOVES_D(b1, -TDELTA_N -TDELTA_N);
return mlist;
}
template<CastlingSide Side>
MoveStack* generate_castle_moves(const Position& pos, MoveStack* mlist) {