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More work on Bitboards::init() 

No functional change.
pull/358/head
Marco Costalba 2013-12-07 12:09:33 +01:00
parent 1ff5ce8863
commit 4630ab5743
1 changed files with 11 additions and 14 deletions
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src/bitboard.cpp
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@ -119,7 +119,7 @@ Square msb(Bitboard b) {
result += 8;
}
return (Square)(result + MS1BTable[b32]);
return Square(result + MS1BTable[b32]);
}
#endif // ifndef USE_BSFQ
@ -146,8 +146,8 @@ const std::string Bitboards::pretty(Bitboard b) {
}
/// Bitboards::init() initializes various bitboard arrays. It is called during
/// program initialization.
/// Bitboards::init() initializes various bitboard tables. It is called at
/// startup and relies on global objects to be already zero-initialized.
void Bitboards::init() {
@ -157,14 +157,11 @@ void Bitboards::init() {
for (Bitboard b = 1; b < 256; ++b)
MS1BTable[b] = more_than_one(b) ? MS1BTable[b - 1] : lsb(b);
FileBB[FILE_A] = FileABB;
RankBB[RANK_1] = Rank1BB;
for (File f = FILE_A; f <= FILE_H; ++f)
FileBB[f] = f > FILE_A ? FileBB[f - 1] << 1 : FileABB;
for (int i = 1; i < 8; ++i)
{
FileBB[i] = FileBB[i - 1] << 1;
RankBB[i] = RankBB[i - 1] << 8;
}
for (Rank r = RANK_1; r <= RANK_8; ++r)
RankBB[r] = r > RANK_1 ? RankBB[r - 1] << 8 : Rank1BB;
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);
@ -182,11 +179,11 @@ void Bitboards::init() {
for (Square s1 = SQ_A1; s1 <= SQ_H8; ++s1)
for (Square s2 = SQ_A1; s2 <= SQ_H8; ++s2)
{
SquareDistance[s1][s2] = std::max(file_distance(s1, s2), rank_distance(s1, s2));
if (s1 != s2)
DistanceRingsBB[s1][SquareDistance[s1][s2] - 1] |= s2;
}
{
SquareDistance[s1][s2] = std::max(file_distance(s1, s2), rank_distance(s1, s2));
DistanceRingsBB[s1][SquareDistance[s1][s2] - 1] |= s2;
}
int steps[][9] = { {}, { 7, 9 }, { 17, 15, 10, 6, -6, -10, -15, -17 },
{}, {}, {}, { 9, 7, -7, -9, 8, 1, -1, -8 } };