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Replace clear_bit() with xor_bit()

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This allows to retire ClearMaskBB[] and use just
one SquareBB[] array to set and clear a bit.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2012-01-29 09:11:03 +01:00
parent b76c04c097
commit 875a8079bc
8 changed files with 49 additions and 61 deletions
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43
src/bitboard.h
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@@ -23,50 +23,43 @@
#include "types.h"
extern Bitboard RMasks[64];
extern Bitboard RMagics[64];
extern Bitboard* RAttacks[64];
extern int RShifts[64];
extern Bitboard BMasks[64];
extern Bitboard BMagics[64];
extern Bitboard* BAttacks[64];
extern int BShifts[64];
extern Bitboard SquareBB[64];
extern Bitboard FileBB[8];
extern Bitboard RankBB[8];
extern Bitboard AdjacentFilesBB[8];
extern Bitboard ThisAndAdjacentFilesBB[8];
extern Bitboard RankBB[8];
extern Bitboard InFrontBB[2][8];
extern Bitboard SetMaskBB[65];
extern Bitboard ClearMaskBB[65];
extern Bitboard StepAttacksBB[16][64];
extern Bitboard BetweenBB[64][64];
extern Bitboard SquaresInFrontMask[2][64];
extern Bitboard PassedPawnMask[2][64];
extern Bitboard AttackSpanMask[2][64];
extern uint64_t RMagics[64];
extern int RShifts[64];
extern Bitboard RMasks[64];
extern Bitboard* RAttacks[64];
extern uint64_t BMagics[64];
extern int BShifts[64];
extern Bitboard BMasks[64];
extern Bitboard* BAttacks[64];
extern Bitboard PseudoAttacks[6][64];
extern uint8_t BitCount8Bit[256];
/// Functions for testing whether a given bit is set in a bitboard, and for
/// setting and clearing bits.
inline Bitboard bit_is_set(Bitboard b, Square s) {
return b & SetMaskBB[s];
return b & SquareBB[s];
}
inline void set_bit(Bitboard* b, Square s) {
*b |= SetMaskBB[s];
*b |= SquareBB[s];
}
inline void clear_bit(Bitboard* b, Square s) {
*b &= ClearMaskBB[s];
inline void xor_bit(Bitboard* b, Square s) {
*b ^= SquareBB[s];
}
@@ -74,7 +67,7 @@ inline void clear_bit(Bitboard* b, Square s) {
/// then calling a sequence of clear_bit() + set_bit()
inline Bitboard make_move_bb(Square from, Square to) {
return SetMaskBB[from] | SetMaskBB[to];
return SquareBB[from] | SquareBB[to];
}
inline void do_move_bb(Bitboard* b, Bitboard move_bb) {
@@ -216,7 +209,7 @@ inline Bitboard attack_span_mask(Color c, Square s) {
inline bool squares_aligned(Square s1, Square s2, Square s3) {
return (BetweenBB[s1][s2] | BetweenBB[s1][s3] | BetweenBB[s2][s3])
& ( SetMaskBB[s1] | SetMaskBB[s2] | SetMaskBB[s3]);
& ( SquareBB[s1] | SquareBB[s2] | SquareBB[s3]);
}