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Store pawn attacks in PawnInfo

Browse source 
They are pawn structure invariant so has a sense to
store togheter with pawn info instead of recalculating
them each time evaluate() is called.

Speed up is around 1%

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2009-09-30 08:07:46 +01:00
parent 237dd331d5
commit e677185567
3 changed files with 12 additions and 2 deletions
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4
src/evaluate.cpp
View file

@ -344,8 +344,8 @@ Value do_evaluate(const Position& pos, EvalInfo& ei, int threadID) {
ei.kingZone[BLACK] = ei.attackedBy[WHITE][KING] | (ei.attackedBy[WHITE][KING] << 8);
// Initialize pawn attack bitboards for both sides
ei.attackedBy[WHITE][PAWN] = ((pos.pieces(PAWN, WHITE) << 9) & ~FileABB) | ((pos.pieces(PAWN, WHITE) << 7) & ~FileHBB);
ei.attackedBy[BLACK][PAWN] = ((pos.pieces(PAWN, BLACK) >> 7) & ~FileABB) | ((pos.pieces(PAWN, BLACK) >> 9) & ~FileHBB);
ei.attackedBy[WHITE][PAWN] = ei.pi->pawn_attacks(WHITE);
ei.attackedBy[BLACK][PAWN] = ei.pi->pawn_attacks(BLACK);
Bitboard b1 = ei.attackedBy[WHITE][PAWN] & ei.attackedBy[BLACK][KING];
Bitboard b2 = ei.attackedBy[BLACK][PAWN] & ei.attackedBy[WHITE][KING];
if (b1)

4
src/pawns.cpp
View file

@ -193,6 +193,10 @@ PawnInfo* PawnInfoTable::get_pawn_info(const Position& pos) {
Value mgValue[2] = {Value(0), Value(0)};
Value egValue[2] = {Value(0), Value(0)};
// Calculate pawn attacks
pi->pawnAttacks[WHITE] = ((pos.pieces(PAWN, WHITE) << 9) & ~FileABB) | ((pos.pieces(PAWN, WHITE) << 7) & ~FileHBB);
pi->pawnAttacks[BLACK] = ((pos.pieces(PAWN, BLACK) >> 7) & ~FileABB) | ((pos.pieces(PAWN, BLACK) >> 9) & ~FileHBB);
// Loop through the pawns for both colors
for (Color us = WHITE; us <= BLACK; us++)
{

6
src/pawns.h
View file

@ -51,6 +51,7 @@ public:
Value eg_value() const;
Value kingside_storm_value(Color c) const;
Value queenside_storm_value(Color c) const;
Bitboard pawn_attacks(Color c) const;
Bitboard passed_pawns() const;
int file_is_half_open(Color c, File f) const;
int has_open_file_to_left(Color c, File f) const;
@ -63,6 +64,7 @@ private:
Key key;
Bitboard passedPawns;
Bitboard pawnAttacks[2];
int16_t mgValue, egValue;
int16_t ksStormValue[2], qsStormValue[2];
uint8_t halfOpenFiles[2];
@ -104,6 +106,10 @@ inline Bitboard PawnInfo::passed_pawns() const {
return passedPawns;
}
inline Bitboard PawnInfo::pawn_attacks(Color c) const {
return pawnAttacks[c];
}
inline Value PawnInfo::kingside_storm_value(Color c) const {
return Value(ksStormValue[c]);
}