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Simplify attacks_bb()

Browse source 
And some formatting while there.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2012-05-01 12:17:08 +01:00
parent b9bc6e823f
commit 2f47844c7c
2 changed files with 12 additions and 17 deletions
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26
src/bitboard.cpp
View file

@ -168,30 +168,27 @@ void Bitboards::init() {
FileBB[FILE_A] = FileABB;
RankBB[RANK_1] = Rank1BB;
for (int f = FILE_B; f <= FILE_H; f++)
for (int i = 1; i < 8; i++)
{
FileBB[f] = FileBB[f - 1] << 1;
RankBB[f] = RankBB[f - 1] << 8;
FileBB[i] = FileBB[i - 1] << 1;
RankBB[i] = RankBB[i - 1] << 8;
}
for (int f = FILE_A; f <= FILE_H; f++)
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 (int rw = RANK_7, rb = RANK_2; rw >= RANK_1; rw--, rb++)
{
InFrontBB[WHITE][rw] = InFrontBB[WHITE][rw + 1] | RankBB[rw + 1];
InFrontBB[BLACK][rb] = InFrontBB[BLACK][rb - 1] | RankBB[rb - 1];
}
for (Rank r = RANK_1; r < RANK_8; r++)
InFrontBB[WHITE][r] = ~(InFrontBB[BLACK][r + 1] = InFrontBB[BLACK][r] | RankBB[r]);
for (Color c = WHITE; c <= BLACK; c++)
for (Square s = SQ_A1; s <= SQ_H8; s++)
{
ForwardBB[c][s] = in_front_bb(c, s) & file_bb(s);
PassedPawnMask[c][s] = in_front_bb(c, s) & this_and_adjacent_files_bb(file_of(s));
AttackSpanMask[c][s] = in_front_bb(c, s) & adjacent_files_bb(file_of(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)];
}
for (Square s1 = SQ_A1; s1 <= SQ_H8; s1++)
@ -231,9 +228,8 @@ void Bitboards::init() {
for (Square s = SQ_A1; s <= SQ_H8; s++)
{
PseudoAttacks[BISHOP][s] = attacks_bb<BISHOP>(s, 0);
PseudoAttacks[ROOK][s] = attacks_bb<ROOK>(s, 0);
PseudoAttacks[QUEEN][s] = PseudoAttacks[BISHOP][s] | PseudoAttacks[ROOK][s];
PseudoAttacks[QUEEN][s] = PseudoAttacks[BISHOP][s] = attacks_bb<BISHOP>(s, 0);
PseudoAttacks[QUEEN][s] |= PseudoAttacks[ ROOK][s] = attacks_bb< ROOK>(s, 0);
}
for (Square s1 = SQ_A1; s1 <= SQ_H8; s1++)

3
src/bitboard.h
View file

@ -216,8 +216,7 @@ FORCE_INLINE unsigned magic_index(Square s, Bitboard occ) {
template<PieceType Pt>
inline Bitboard attacks_bb(Square s, Bitboard occ) {
Bitboard** const Attacks = Pt == ROOK ? RAttacks : BAttacks;
return Attacks[s][magic_index<Pt>(s, occ)];
return (Pt == ROOK ? RAttacks : BAttacks)[s][magic_index<Pt>(s, occ)];
}