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Micro optimize open files calculation

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Committed mostly because is also a cleanup...

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2010-10-09 15:04:24 +01:00
parent a0474a72a6
commit 9c9914d72a
1 changed files with 10 additions and 11 deletions
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21
src/pawns.cpp
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@ -124,18 +124,19 @@ PawnInfo* PawnInfoTable::get_pawn_info(const Position& pos) const {
// Clear the PawnInfo object, and set the key
memset(pi, 0, sizeof(PawnInfo));
pi->halfOpenFiles[WHITE] = pi->halfOpenFiles[BLACK] = 0xFF;
pi->kingSquares[WHITE] = pi->kingSquares[BLACK] = SQ_NONE;
pi->key = key;
// Calculate pawn attacks
Bitboard whitePawns = pos.pieces(PAWN, WHITE);
Bitboard blackPawns = pos.pieces(PAWN, BLACK);
pi->pawnAttacks[WHITE] = ((whitePawns << 9) & ~FileABB) | ((whitePawns << 7) & ~FileHBB);
pi->pawnAttacks[BLACK] = ((blackPawns >> 7) & ~FileABB) | ((blackPawns >> 9) & ~FileHBB);
Bitboard wPawns = pos.pieces(PAWN, WHITE);
Bitboard bPawns = pos.pieces(PAWN, BLACK);
pi->pawnAttacks[WHITE] = ((wPawns << 9) & ~FileABB) | ((wPawns << 7) & ~FileHBB);
pi->pawnAttacks[BLACK] = ((bPawns >> 7) & ~FileABB) | ((bPawns >> 9) & ~FileHBB);
// Evaluate pawns for both colors
pi->value = evaluate_pawns<WHITE>(pos, whitePawns, blackPawns, pi)
- evaluate_pawns<BLACK>(pos, blackPawns, whitePawns, pi);
pi->value = evaluate_pawns<WHITE>(pos, wPawns, bPawns, pi)
- evaluate_pawns<BLACK>(pos, bPawns, wPawns, pi);
return pi;
}
@ -154,11 +155,6 @@ Score PawnInfoTable::evaluate_pawns(const Position& pos, Bitboard ourPawns,
const BitCountType Max15 = CpuIs64Bit ? CNT64_MAX15 : CNT32_MAX15;
const Square* ptr = pos.piece_list_begin(Us, PAWN);
// Initialize halfOpenFiles[]
for (f = FILE_A; f <= FILE_H; f++)
if (!(ourPawns & file_bb(f)))
pi->halfOpenFiles[Us] |= (1 << f);
// Loop through all pawns of the current color and score each pawn
while ((s = *ptr++) != SQ_NONE)
{
@ -167,6 +163,9 @@ Score PawnInfoTable::evaluate_pawns(const Position& pos, Bitboard ourPawns,
f = square_file(s);
r = square_rank(s);
// This file cannot be half open
pi->halfOpenFiles[Us] &= ~(1 << f);
// Our rank plus previous one. Used for chain detection.
b = rank_bb(r) | rank_bb(Us == WHITE ? r - Rank(1) : r + Rank(1));