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Remove DistanceRing #2107

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Remove the DistanceRing array. This reduces the
memory footprint by about 4kb.

http://tests.stockfishchess.org/tests/view/5cba35350ebc5925cf020d7f
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 101421 W: 22491 L: 22528 D: 56402

No functional change.
This commit is contained in:
protonspring
2019-04-17 12:38:38 -06:00
committed by Marco Costalba
parent bdeb01dec0
commit a858b5a84e
3 changed files with 8 additions and 9 deletions
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4
src/bitboard.cpp
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@@ -28,7 +28,6 @@ uint8_t PopCnt16[1 << 16];
uint8_t SquareDistance[SQUARE_NB][SQUARE_NB];
Bitboard LineBB[SQUARE_NB][SQUARE_NB];
Bitboard DistanceRingBB[SQUARE_NB][8];
Bitboard PseudoAttacks[PIECE_TYPE_NB][SQUARE_NB];
Bitboard PawnAttacks[COLOR_NB][SQUARE_NB];
Bitboard SquareBB[SQUARE_NB];
@@ -83,10 +82,7 @@ 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(distance<File>(s1, s2), distance<Rank>(s1, s2));
DistanceRingBB[s1][SquareDistance[s1][s2]] |= s2;
}
int steps[][5] = { {}, { 7, 9 }, { 6, 10, 15, 17 }, {}, {}, {}, { 1, 7, 8, 9 } };