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Restore MS1BTable[]

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Incredible typo from my side!

The 2 tables are completely different, one counts 1s the
other returns the msb position. Even more incredible
the 'stockfish bench' command returns the same number
of nodes!!!

Spotted by Justin Blanchard.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2012-03-28 19:01:37 +01:00
parent d6e3a40c81
commit 76622342ec
1 changed files with 6 additions and 1 deletions
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7
src/bitboard.cpp
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@ -58,6 +58,7 @@ namespace {
CACHE_LINE_ALIGNMENT
int BSFTable[64];
int MS1BTable[256];
Bitboard RTable[0x19000]; // Storage space for rook attacks
Bitboard BTable[0x1480]; // Storage space for bishop attacks
@ -160,7 +161,7 @@ Square last_1(Bitboard b) {
result += 8;
}
return Square(result + BitCount8Bit[b]);
return Square(result + MS1BTable[b]);
}
#endif // !defined(USE_BSFQ)
@ -170,6 +171,10 @@ Square last_1(Bitboard b) {
void bitboards_init() {
for (int k = 0, i = 0; i < 8; i++)
while (k < (2 << i))
MS1BTable[k++] = i;
for (Bitboard b = 0; b < 256; b++)
BitCount8Bit[b] = (uint8_t)popcount<Max15>(b);