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Retire direction.cpp

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Move the code to bitboard.cpp

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2010-12-26 16:27:58 +01:00
parent cb7f20913e
commit 4dded4e72f
7 changed files with 55 additions and 82 deletions
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19
src/bitboard.h
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@@ -90,6 +90,7 @@ extern Bitboard RookPseudoAttacks[64];
extern Bitboard QueenPseudoAttacks[64];
extern uint8_t BitCount8Bit[256];
extern int8_t DirectionTable[64][64];
////
@@ -297,6 +298,24 @@ inline Bitboard attack_span_mask(Color c, Square s) {
}
/// squares_aligned returns true if the squares s1, s2 and s3 are aligned
/// either on a straight or on a diagonal line.
inline bool squares_aligned(Square s1, Square s2, Square s3) {
return DirectionTable[s1][s2] != DELTA_NONE
&& abs(DirectionTable[s1][s2]) == abs(DirectionTable[s2][s3]);
}
/// squares_straight_aligned returns true if the squares s1 and s2 are aligned
/// on a straight line, either veritical or horizontal.
inline bool squares_straight_aligned(Square s1, Square s2) {
return abs(DirectionTable[s1][s2]) == DELTA_N
|| abs(DirectionTable[s1][s2]) == DELTA_E;
}
/// first_1() finds the least significant nonzero bit in a nonzero bitboard.
/// pop_1st_bit() finds and clears the least significant nonzero bit in a
/// nonzero bitboard.