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Greatly simplify weight_option()

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No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2010-05-11 10:07:17 +02:00
parent 2aa455ce95
commit 7f095b0a36
1 changed files with 6 additions and 14 deletions
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20
src/evaluate.cpp
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@ -1046,14 +1046,12 @@ namespace {
// Find the safe squares for our pieces inside the area defined by
// SpaceMask[us]. A square is unsafe if it is attacked by an enemy
// pawn, or if it is undefended and attacked by an enemy piece.
Bitboard safeSquares = SpaceMask[Us]
& ~pos.pieces(PAWN, Us)
& ~ei.attacked_by(Them, PAWN)
& ~(~ei.attacked_by(Us) & ei.attacked_by(Them));
& (ei.attacked_by(Us) | ~ei.attacked_by(Them));
// Find all squares which are at most three squares behind some friendly
// pawn.
// Find all squares which are at most three squares behind some friendly pawn
Bitboard behindFriendlyPawns = pos.pieces(PAWN, Us);
behindFriendlyPawns |= (Us == WHITE ? behindFriendlyPawns >> 8 : behindFriendlyPawns << 8);
behindFriendlyPawns |= (Us == WHITE ? behindFriendlyPawns >> 16 : behindFriendlyPawns << 16);
@ -1094,17 +1092,11 @@ namespace {
Score weight_option(const std::string& mgOpt, const std::string& egOpt, Score internalWeight) {
Score uciWeight = make_score(get_option_value_int(mgOpt), get_option_value_int(egOpt));
// Scale option value from 100 to 256
int mg = get_option_value_int(mgOpt) * 256 / 100;
int eg = get_option_value_int(egOpt) * 256 / 100;
// Convert to integer to prevent overflow
int mg = mg_value(uciWeight);
int eg = eg_value(uciWeight);
mg = (mg * 0x100) / 100;
eg = (eg * 0x100) / 100;
mg = (mg * mg_value(internalWeight)) / 0x100;
eg = (eg * eg_value(internalWeight)) / 0x100;
return make_score(mg, eg);
return apply_weight(make_score(mg, eg), internalWeight);
}
// init_safety() initizes the king safety evaluation, based on UCI