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Code Issues Releases Wiki Activity

Speed up apply_weight

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Speed up by about 2% this hot path function pre-calculating
midgame and endgame values of the weight.

No functional change.
This commit is contained in:
mstembera 2014-04-03 20:08:54 -07:00 • committed by Marco Costalba
parent ccf59b0228
commit 3b19ea6ae5
1 changed files with 9 additions and 12 deletions
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21
src/evaluate.cpp
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@ -91,7 +91,7 @@ namespace {
// Evaluation weights, initialized from UCI options
enum { Mobility, PawnStructure, PassedPawns, Space, KingDangerUs, KingDangerThem };
Score Weights[6];
struct Weight { int mg, eg; } Weights[6];
typedef Value V;
#define S(mg, eg) make_score(mg, eg)
@ -233,8 +233,8 @@ namespace {
Score evaluate_unstoppable_pawns(const Position& pos, Color us, const EvalInfo& ei);
Value interpolate(const Score& v, Phase ph, ScaleFactor sf);
Score apply_weight(Score v, Score w);
Score weight_option(const std::string& mgOpt, const std::string& egOpt, Score internalWeight);
Score apply_weight(Score v, const Weight& w);
Weight weight_option(const std::string& mgOpt, const std::string& egOpt, Score internalWeight);
}
@ -925,22 +925,19 @@ Value do_evaluate(const Position& pos) {
}
// apply_weight() weights score v by score w trying to prevent overflow
Score apply_weight(Score v, Score w) {
Score apply_weight(Score v, const Weight& w) {
return make_score((int(mg_value(v)) * mg_value(w)) / 0x100,
(int(eg_value(v)) * eg_value(w)) / 0x100);
return make_score(mg_value(v) * w.mg / 256, eg_value(v) * w.eg / 256);
}
// weight_option() computes the value of an evaluation weight, by combining
// two UCI-configurable weights (midgame and endgame) with an internal weight.
Score weight_option(const std::string& mgOpt, const std::string& egOpt, Score internalWeight) {
Weight weight_option(const std::string& mgOpt, const std::string& egOpt, Score internalWeight) {
// Scale option value from 100 to 256
int mg = Options[mgOpt] * 256 / 100;
int eg = Options[egOpt] * 256 / 100;
return apply_weight(make_score(mg, eg), internalWeight);
Weight w = { Options[mgOpt] * mg_value(internalWeight) / 100,
Options[egOpt] * eg_value(internalWeight) / 100 };
return w;
}