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Code Issues Releases Wiki Activity

Retire ThisAndAdjacentFilesBB[]

Browse source 
It is unused. Also renamed attack_span_mask to
pawn_attack_span

No functional change.
This commit is contained in:
Marco Costalba 2013-06-23 10:03:48 +02:00
parent 378bcfe760
commit b2fadf32aa
4 changed files with 12 additions and 25 deletions
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10
src/bitboard.cpp
View file

@ -42,14 +42,13 @@ Bitboard SquareBB[SQUARE_NB];
Bitboard FileBB[FILE_NB];
Bitboard RankBB[RANK_NB];
Bitboard AdjacentFilesBB[FILE_NB];
Bitboard ThisAndAdjacentFilesBB[FILE_NB];
Bitboard InFrontBB[COLOR_NB][RANK_NB];
Bitboard StepAttacksBB[PIECE_NB][SQUARE_NB];
Bitboard BetweenBB[SQUARE_NB][SQUARE_NB];
Bitboard DistanceRingsBB[SQUARE_NB][8];
Bitboard ForwardBB[COLOR_NB][SQUARE_NB];
Bitboard PassedPawnMask[COLOR_NB][SQUARE_NB];
Bitboard AttackSpanMask[COLOR_NB][SQUARE_NB];
Bitboard PawnAttackSpan[COLOR_NB][SQUARE_NB];
Bitboard PseudoAttacks[PIECE_TYPE_NB][SQUARE_NB];
int SquareDistance[SQUARE_NB][SQUARE_NB];
@ -171,10 +170,7 @@ void Bitboards::init() {
}
for (File f = FILE_A; f <= FILE_H; f++)
{
AdjacentFilesBB[f] = (f > FILE_A ? FileBB[f - 1] : 0) | (f < FILE_H ? FileBB[f + 1] : 0);
ThisAndAdjacentFilesBB[f] = FileBB[f] | AdjacentFilesBB[f];
}
for (Rank r = RANK_1; r < RANK_8; r++)
InFrontBB[WHITE][r] = ~(InFrontBB[BLACK][r + 1] = InFrontBB[BLACK][r] | RankBB[r]);
@ -183,8 +179,8 @@ void Bitboards::init() {
for (Square s = SQ_A1; s <= SQ_H8; s++)
{
ForwardBB[c][s] = InFrontBB[c][rank_of(s)] & FileBB[file_of(s)];
PassedPawnMask[c][s] = InFrontBB[c][rank_of(s)] & ThisAndAdjacentFilesBB[file_of(s)];
AttackSpanMask[c][s] = InFrontBB[c][rank_of(s)] & AdjacentFilesBB[file_of(s)];
PawnAttackSpan[c][s] = InFrontBB[c][rank_of(s)] & AdjacentFilesBB[file_of(s)];
PassedPawnMask[c][s] = ForwardBB[c][s] | PawnAttackSpan[c][s];
}
for (Square s1 = SQ_A1; s1 <= SQ_H8; s1++)

15
src/bitboard.h
View file

@ -53,14 +53,13 @@ extern Bitboard SquareBB[SQUARE_NB];
extern Bitboard FileBB[FILE_NB];
extern Bitboard RankBB[RANK_NB];
extern Bitboard AdjacentFilesBB[FILE_NB];
extern Bitboard ThisAndAdjacentFilesBB[FILE_NB];
extern Bitboard InFrontBB[COLOR_NB][RANK_NB];
extern Bitboard StepAttacksBB[PIECE_NB][SQUARE_NB];
extern Bitboard BetweenBB[SQUARE_NB][SQUARE_NB];
extern Bitboard DistanceRingsBB[SQUARE_NB][8];
extern Bitboard ForwardBB[COLOR_NB][SQUARE_NB];
extern Bitboard PassedPawnMask[COLOR_NB][SQUARE_NB];
extern Bitboard AttackSpanMask[COLOR_NB][SQUARE_NB];
extern Bitboard PawnAttackSpan[COLOR_NB][SQUARE_NB];
extern Bitboard PseudoAttacks[PIECE_TYPE_NB][SQUARE_NB];
const Bitboard BlackSquares = 0xAA55AA55AA55AA55ULL;
@ -136,14 +135,6 @@ inline Bitboard adjacent_files_bb(File f) {
}
/// this_and_adjacent_files_bb takes a file as input and returns a bitboard
/// representing all squares on the given and adjacent files.
inline Bitboard this_and_adjacent_files_bb(File f) {
return ThisAndAdjacentFilesBB[f];
}
/// in_front_bb() takes a color and a rank or square as input, and returns a
/// bitboard representing all the squares on all ranks in front of the rank
/// (or square), from the given color's point of view. For instance,
@ -194,8 +185,8 @@ inline Bitboard passed_pawn_mask(Color c, Square s) {
/// when it moves along its file starting from the given square. Definition is:
/// AttackSpanMask[c][s] = in_front_bb(c, s) & adjacent_files_bb(s);
inline Bitboard attack_span_mask(Color c, Square s) {
return AttackSpanMask[c][s];
inline Bitboard pawn_attack_span(Color c, Square s) {
return PawnAttackSpan[c][s];
}

4
src/evaluate.cpp
View file

@ -530,7 +530,7 @@ Value do_evaluate(const Position& pos, Value& margin) {
// Bishop and knight outposts squares
if ( (Piece == BISHOP || Piece == KNIGHT)
&& !(pos.pieces(Them, PAWN) & attack_span_mask(Us, s)))
&& !(pos.pieces(Them, PAWN) & pawn_attack_span(Us, s)))
score += evaluate_outposts<Piece, Us>(pos, ei, s);
if ( (Piece == ROOK || Piece == QUEEN)
@ -999,7 +999,7 @@ Value do_evaluate(const Position& pos, Value& margin) {
}
// Check pawns that can be sacrificed against the blocking pawn
b2 = attack_span_mask(winnerSide, blockSq) & candidates & ~(1ULL << s);
b2 = pawn_attack_span(winnerSide, blockSq) & candidates & ~(1ULL << s);
while (b2) // This while-loop could be replaced with LSB/MSB (depending on color)
{

8
src/pawns.cpp
View file

@ -134,7 +134,7 @@ namespace {
// be backward. If there are friendly pawns behind on adjacent files
// or if can capture an enemy pawn it cannot be backward either.
if ( !(passed | isolated | chain)
&& !(ourPawns & attack_span_mask(Them, s))
&& !(ourPawns & pawn_attack_span(Them, s))
&& !(pos.attacks_from<PAWN>(s, Us) & theirPawns))
{
// We now know that there are no friendly pawns beside or behind this
@ -153,15 +153,15 @@ namespace {
backward = (b | shift_bb<Up>(b)) & theirPawns;
}
assert(opposed | passed | (attack_span_mask(Us, s) & theirPawns));
assert(opposed | passed | (pawn_attack_span(Us, s) & theirPawns));
// A not passed pawn is a candidate to become passed if it is free to
// advance and if the number of friendly pawns beside or behind this
// pawn on adjacent files is higher or equal than the number of
// enemy pawns in the forward direction on the adjacent files.
candidate = !(opposed | passed | backward | isolated)
&& (b = attack_span_mask(Them, s + pawn_push(Us)) & ourPawns) != 0
&& popcount<Max15>(b) >= popcount<Max15>(attack_span_mask(Us, s) & theirPawns);
&& (b = pawn_attack_span(Them, s + pawn_push(Us)) & ourPawns) != 0
&& popcount<Max15>(b) >= popcount<Max15>(pawn_attack_span(Us, s) & theirPawns);
// Passed pawns will be properly scored in evaluation because we need
// full attack info to evaluate passed pawns. Only the frontmost passed