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Slight speep up fetching the endgame table

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Replace calls to count(key) + operator[key] with a single call to find(key).
Replace the std::map with std::unordered_map which provide O(1) access,
although the map has a really small number of objects.

Test with [0..4] failed yellow:

TC	10+0.1
SPRT	elo0: 0.00  alpha: 0.05  elo1: 4.00  beta: 0.05
LLR	-2.96 [-2.94,2.94] (rejected)
Elo	1.01 [-0.87,3.08] (95%)
LOS	85.3%
Games	71860 [w:22.3%, l:22.2%, d:55.5%]
http://tests.stockfishchess.org/tests/view/5d5432210ebc5925cf109d61

Closes https://github.com/official-stockfish/Stockfish/pull/2269

No functional change
This commit is contained in:
Jean Gauthier 2019-08-14 08:44:21 -04:00 • committed by Stéphane Nicolet
parent 7efc39d683
commit d4dca9187e
1 changed files with 4 additions and 3 deletions
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7
src/endgame.h
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@ -21,7 +21,7 @@
#ifndef ENDGAME_H_INCLUDED
#define ENDGAME_H_INCLUDED
#include <map>
#include <unordered_map>
#include <memory>
#include <string>
#include <type_traits>
@ -98,7 +98,7 @@ struct Endgame : public EndgameBase<T> {
namespace Endgames {
template<typename T> using Ptr = std::unique_ptr<EndgameBase<T>>;
template<typename T> using Map = std::map<Key, Ptr<T>>;
template<typename T> using Map = std::unordered_map<Key, Ptr<T>>;
extern std::pair<Map<Value>, Map<ScaleFactor>> maps;
@ -119,7 +119,8 @@ namespace Endgames {
template<typename T>
const EndgameBase<T>* probe(Key key) {
return map<T>().count(key) ? map<T>()[key].get() : nullptr;
auto it = map<T>().find(key);
return it != map<T>().end() ? it->second.get() : nullptr;
}
}