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Use int8_t instead of int for SquareDistance[]

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This patch saves (4-1) * 64 * 64 = 12KiB of cache.

STC
LLR: 2.95 (-2.94,2.94) [0.00,4.00]
Total: 176120 W: 38944 L: 38087 D: 99089
http://tests.stockfishchess.org/tests/view/5c4c9f840ebc593af5d4a7ce

LTC
As a pure speed up, I've been informed it should not require LTC.

No functional change
This commit is contained in:
Maciej Żenczykowski 2019-01-26 09:16:17 -08:00 • committed by Stéphane Nicolet
parent 2d0af36753
commit 8df1cd10df
2 changed files with 2 additions and 2 deletions
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2
src/bitboard.cpp
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@ -24,7 +24,7 @@
#include "misc.h"
uint8_t PopCnt16[1 << 16];
int SquareDistance[SQUARE_NB][SQUARE_NB];
int8_t SquareDistance[SQUARE_NB][SQUARE_NB];
Bitboard SquareBB[SQUARE_NB];
Bitboard FileBB[FILE_NB];

2
src/bitboard.h
View file

@ -60,7 +60,7 @@ constexpr Bitboard Rank6BB = Rank1BB << (8 * 5);
constexpr Bitboard Rank7BB = Rank1BB << (8 * 6);
constexpr Bitboard Rank8BB = Rank1BB << (8 * 7);
extern int SquareDistance[SQUARE_NB][SQUARE_NB];
extern int8_t SquareDistance[SQUARE_NB][SQUARE_NB];
extern Bitboard SquareBB[SQUARE_NB];
extern Bitboard FileBB[FILE_NB];