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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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14
src/bitboard.cpp
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@@ -25,6 +25,8 @@
#include "bitcount.h"
#include "rkiss.h"
CACHE_LINE_ALIGNMENT
Bitboard RMasks[64];
Bitboard RMagics[64];
Bitboard* RAttacks[64];
@@ -35,9 +37,7 @@ Bitboard BMagics[64];
Bitboard* BAttacks[64];
int BShifts[64];
Bitboard SetMaskBB[65];
Bitboard ClearMaskBB[65];
Bitboard SquareBB[64];
Bitboard FileBB[8];
Bitboard RankBB[8];
Bitboard AdjacentFilesBB[8];
@@ -48,7 +48,6 @@ Bitboard BetweenBB[64][64];
Bitboard SquaresInFrontMask[2][64];
Bitboard PassedPawnMask[2][64];
Bitboard AttackSpanMask[2][64];
Bitboard PseudoAttacks[6][64];
uint8_t BitCount8Bit[256];
@@ -157,12 +156,7 @@ void bitboards_init() {
BitCount8Bit[b] = (uint8_t)popcount<Max15>(b);
for (Square s = SQ_A1; s <= SQ_H8; s++)
{
SetMaskBB[s] = 1ULL << s;
ClearMaskBB[s] = ~SetMaskBB[s];
}
ClearMaskBB[SQ_NONE] = ~0ULL;
SquareBB[s] = 1ULL << s;
FileBB[FILE_A] = FileABB;
RankBB[RANK_1] = Rank1BB;