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Remove openFiles in pawns. (#1917)

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A single popcount in evaluate.cpp replaces all openFiles stuff in pawns. It doesn't seem to affect performance at all.

STC
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 28103 W: 6134 L: 6025 D: 15944
http://tests.stockfishchess.org/tests/view/5b7d70a20ebc5902bdbb1999

No functional change.
This commit is contained in:
protonspring 2019-01-01 05:38:09 -07:00 • committed by Marco Costalba
parent 7accf07c0b
commit 79c97625a4
3 changed files with 2 additions and 4 deletions
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3
src/evaluate.cpp
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@ -717,7 +717,8 @@ namespace {
behind |= (Us == WHITE ? behind >> 16 : behind << 16);
int bonus = popcount(safe) + popcount(behind & safe);
int weight = pos.count<ALL_PIECES>(Us) - 2 * pe->open_files();
int weight = pos.count<ALL_PIECES>(Us)
- 2 * popcount(pe->semiopenFiles[WHITE] & pe->semiopenFiles[BLACK]);
Score score = make_score(bonus * weight * weight / 16, 0);

1
src/pawns.cpp
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@ -185,7 +185,6 @@ Entry* probe(const Position& pos) {
e->key = key;
e->scores[WHITE] = evaluate<WHITE>(pos, e);
e->scores[BLACK] = evaluate<BLACK>(pos, e);
e->openFiles = popcount(e->semiopenFiles[WHITE] & e->semiopenFiles[BLACK]);
e->asymmetry = popcount( (e->passedPawns[WHITE] | e->passedPawns[BLACK])
| (e->semiopenFiles[WHITE] ^ e->semiopenFiles[BLACK]));

2
src/pawns.h
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@ -39,7 +39,6 @@ struct Entry {
Bitboard pawn_attacks_span(Color c) const { return pawnAttacksSpan[c]; }
int weak_unopposed(Color c) const { return weakUnopposed[c]; }
int pawn_asymmetry() const { return asymmetry; }
int open_files() const { return openFiles; }
int semiopen_file(Color c, File f) const {
return semiopenFiles[c] & (1 << f);
@ -73,7 +72,6 @@ struct Entry {
int semiopenFiles[COLOR_NB];
int pawnsOnSquares[COLOR_NB][COLOR_NB]; // [color][light/dark squares]
int asymmetry;
int openFiles;
};
typedef HashTable<Entry, 16384> Table;