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Simplify generate_pawn_captures()

Browse source 
No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2010-11-15 16:27:05 +01:00
parent a1c02815cc
commit b36900ef44
1 changed files with 24 additions and 30 deletions
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54
src/movegen.cpp
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@ -444,34 +444,26 @@ namespace {
return mlist;
}
template<Color Us, SquareDelta Direction>
template<SquareDelta Delta>
inline Bitboard move_pawns(Bitboard p) {
if (Direction == DELTA_N)
return Us == WHITE ? p << 8 : p >> 8;
else if (Direction == DELTA_NE)
return Us == WHITE ? p << 9 : p >> 7;
else if (Direction == DELTA_NW)
return Us == WHITE ? p << 7 : p >> 9;
else
return p;
return Delta == DELTA_N ? p << 8 : Delta == DELTA_S ? p >> 8 :
Delta == DELTA_NE ? p << 9 : Delta == DELTA_SE ? p >> 7 :
Delta == DELTA_NW ? p << 7 : Delta == DELTA_SW ? p >> 9 : p;
}
template<Color Us, MoveType Type, SquareDelta Diagonal>
inline MoveStack* generate_pawn_captures(MoveStack* mlist, Bitboard pawns, Bitboard enemyPieces) {
template<Color Us, MoveType Type, SquareDelta Delta>
inline MoveStack* generate_pawn_captures(MoveStack* mlist, Bitboard pawns, Bitboard target) {
// Calculate our parametrized parameters at compile time
const Bitboard TRank8BB = (Us == WHITE ? Rank8BB : Rank1BB);
const Bitboard TFileABB = (Diagonal == DELTA_NE ? FileABB : FileHBB);
const SquareDelta TDELTA_NE = (Us == WHITE ? DELTA_NE : DELTA_SE);
const SquareDelta TDELTA_NW = (Us == WHITE ? DELTA_NW : DELTA_SW);
const SquareDelta TTDELTA_NE = (Diagonal == DELTA_NE ? TDELTA_NE : TDELTA_NW);
const Bitboard TFileABB = (Delta == DELTA_NE || Delta == DELTA_SE ? FileABB : FileHBB);
Bitboard b1, b2;
Square to;
// Captures in the a1-h8 (a8-h1 for black) diagonal or in the h1-a8 (h8-a1 for black)
b1 = move_pawns<Us, Diagonal>(pawns) & ~TFileABB & enemyPieces;
b1 = move_pawns<Delta>(pawns) & ~TFileABB & target;
// Capturing promotions and under-promotions
if (b1 & TRank8BB)
@ -483,26 +475,26 @@ namespace {
to = pop_1st_bit(&b2);
if (Type == CAPTURE || Type == EVASION)
(*mlist++).move = make_promotion_move(to - TTDELTA_NE, to, QUEEN);
(*mlist++).move = make_promotion_move(to - Delta, to, QUEEN);
if (Type == NON_CAPTURE || Type == EVASION)
{
(*mlist++).move = make_promotion_move(to - TTDELTA_NE, to, ROOK);
(*mlist++).move = make_promotion_move(to - TTDELTA_NE, to, BISHOP);
(*mlist++).move = make_promotion_move(to - TTDELTA_NE, to, KNIGHT);
(*mlist++).move = make_promotion_move(to - Delta, to, ROOK);
(*mlist++).move = make_promotion_move(to - Delta, to, BISHOP);
(*mlist++).move = make_promotion_move(to - Delta, to, KNIGHT);
}
// This is the only possible under promotion that can give a check
// not already included in the queen-promotion. It is not sure that
// the promoted knight will give check, but it doesn't worth to verify.
if (Type == CHECK)
(*mlist++).move = make_promotion_move(to - TTDELTA_NE, to, KNIGHT);
(*mlist++).move = make_promotion_move(to - Delta, to, KNIGHT);
}
}
// Serialize standard captures
if (Type == CAPTURE || Type == EVASION)
SERIALIZE_MOVES_D(b1, -TTDELTA_NE);
SERIALIZE_MOVES_D(b1, -Delta);
return mlist;
}
@ -515,7 +507,9 @@ namespace {
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);
const SquareDelta TDELTA_N = (Us == WHITE ? DELTA_N : DELTA_S);
const SquareDelta TDELTA_NE = (Us == WHITE ? DELTA_NE : DELTA_SE);
const SquareDelta TDELTA_NW = (Us == WHITE ? DELTA_NW : DELTA_SW);
Square to;
Bitboard b1, b2, enemyPieces, emptySquares;
@ -529,14 +523,14 @@ namespace {
if (Type == EVASION)
enemyPieces &= target; // Capture only the checker piece
mlist = generate_pawn_captures<Us, Type, DELTA_NE>(mlist, pawns, enemyPieces);
mlist = generate_pawn_captures<Us, Type, DELTA_NW>(mlist, pawns, enemyPieces);
mlist = generate_pawn_captures<Us, Type, TDELTA_NE>(mlist, pawns, enemyPieces);
mlist = generate_pawn_captures<Us, Type, TDELTA_NW>(mlist, pawns, enemyPieces);
}
// Non-capturing promotions and underpromotions
if (pawns & TRank7BB)
{
b1 = move_pawns<Us, DELTA_N>(pawns) & TRank8BB & pos.empty_squares();
b1 = move_pawns<TDELTA_N>(pawns) & TRank8BB & pos.empty_squares();
if (Type == EVASION)
b1 &= target; // Only blocking promotion pushes
@ -568,8 +562,8 @@ namespace {
emptySquares = (Type == NON_CAPTURE ? target : pos.empty_squares());
// Single and double pawn pushes
b1 = move_pawns<Us, DELTA_N>(pawns) & emptySquares & ~TRank8BB;
b2 = move_pawns<Us, DELTA_N>(b1 & TRank3BB) & emptySquares;
b1 = move_pawns<TDELTA_N>(pawns) & emptySquares & ~TRank8BB;
b2 = move_pawns<TDELTA_N>(b1 & TRank3BB) & emptySquares;
// Filter out unwanted pushes according to the move type
if (Type == EVASION)
@ -588,8 +582,8 @@ namespace {
// don't generate captures.
if (pawns & target) // For CHECK type target is dc bitboard
{
Bitboard dc1 = move_pawns<Us, DELTA_N>(pawns & target & ~file_bb(ksq)) & emptySquares & ~TRank8BB;
Bitboard dc2 = move_pawns<Us, DELTA_N>(dc1 & TRank3BB) & emptySquares;
Bitboard dc1 = move_pawns<TDELTA_N>(pawns & target & ~file_bb(ksq)) & emptySquares & ~TRank8BB;
Bitboard dc2 = move_pawns<TDELTA_N>(dc1 & TRank3BB) & emptySquares;
b1 |= dc1;
b2 |= dc2;