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stockfish
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Assorted trivial cleanups 5/2019 

No functional change.

bench: 4178282
pull/2185/head
Marco Costalba 2019-05-02 19:36:25 +02:00
parent 2ead74d1e2
commit d39bc2efa1
12 changed files with 73 additions and 82 deletions
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2
Readme.md
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@ -1,7 +1,7 @@
## Overview
[![Build Status](https://travis-ci.org/official-stockfish/Stockfish.svg?branch=master)](https://travis-ci.org/official-stockfish/Stockfish)
[![Build Status](https://ci.appveyor.com/api/projects/status/github/official-stockfish/Stockfish?svg=true)](https://ci.appveyor.com/project/mcostalba/stockfish)
[![Build Status](https://ci.appveyor.com/api/projects/status/github/official-stockfish/Stockfish?branch=master&svg=true)](https://ci.appveyor.com/project/mcostalba/stockfish/branch/master)
[Stockfish](https://stockfishchess.org) is a free, powerful UCI chess engine
derived from Glaurung 2.1. It is not a complete chess program and requires a

35
src/endgame.cpp
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@ -88,27 +88,28 @@ namespace Endgames {
void init() {
add<KPK>("KPK");
add<KNNK>("KNNK");
add<KBNK>("KBNK");
add<KRKP>("KRKP");
add<KRKB>("KRKB");
add<KRKN>("KRKN");
add<KQKP>("KQKP");
add<KQKR>("KQKR");
add<KNNKP>("KNNKP");
add<KPK>("KPK");
add<KNNK>("KNNK");
add<KBNK>("KBNK");
add<KRKP>("KRKP");
add<KRKB>("KRKB");
add<KRKN>("KRKN");
add<KQKP>("KQKP");
add<KQKR>("KQKR");
add<KNNKP>("KNNKP");
add<KNPK>("KNPK");
add<KNPKB>("KNPKB");
add<KRPKR>("KRPKR");
add<KRPKB>("KRPKB");
add<KBPKB>("KBPKB");
add<KBPKN>("KBPKN");
add<KBPPKB>("KBPPKB");
add<KRPPKRP>("KRPPKRP");
add<KNPK>("KNPK");
add<KNPKB>("KNPKB");
add<KRPKR>("KRPKR");
add<KRPKB>("KRPKB");
add<KBPKB>("KBPKB");
add<KBPKN>("KBPKN");
add<KBPPKB>("KBPPKB");
add<KRPPKRP>("KRPPKRP");
}
}
/// Mate with KX vs K. This function is used to evaluate positions with
/// king and plenty of material vs a lone king. It simply gives the
/// attacking side a bonus for driving the defending king towards the edge

6
src/endgame.h
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@ -91,7 +91,7 @@ struct Endgame : public EndgameBase<T> {
};
/// The Endgames class stores the pointers to endgame evaluation and scaling
/// The Endgames namespace handles the pointers to endgame evaluation and scaling
/// base objects in two std::map. We use polymorphism to invoke the actual
/// endgame function by calling its virtual operator().
@ -102,6 +102,8 @@ namespace Endgames {
extern std::pair<Map<Value>, Map<ScaleFactor>> maps;
void init();
template<typename T>
Map<T>& map() {
return std::get<std::is_same<T, ScaleFactor>::value>(maps);
@ -119,8 +121,6 @@ namespace Endgames {
const EndgameBase<T>* probe(Key key) {
return map<T>().count(key) ? map<T>()[key].get() : nullptr;
}
void init();
}
#endif // #ifndef ENDGAME_H_INCLUDED

8
src/evaluate.cpp
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@ -190,10 +190,8 @@ namespace {
// color, including x-rays. But diagonal x-rays through pawns are not computed.
Bitboard attackedBy2[COLOR_NB];
// kingRing[color] are the squares adjacent to the king, plus (only for a
// king on its first rank) the squares two ranks in front. For instance,
// if black's king is on g8, kingRing[BLACK] is f8, h8, f7, g7, h7, f6, g6
// and h6.
// kingRing[color] are the squares adjacent to the king plus some other
// very near squares, depending on king position.
Bitboard kingRing[COLOR_NB];
// kingAttackersCount[color] is the number of pieces of the given color
@ -802,7 +800,7 @@ namespace {
// Early exit if score is high
Value v = (mg_value(score) + eg_value(score)) / 2;
if (abs(v) > (LazyThreshold + pos.non_pawn_material() / 64))
if (abs(v) > LazyThreshold + pos.non_pawn_material() / 64)
return pos.side_to_move() == WHITE ? v : -v;
// Main evaluation begins here

2
src/main.cpp
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@ -42,8 +42,8 @@ int main(int argc, char* argv[]) {
Bitboards::init();
Position::init();
Bitbases::init();
Search::init();
Endgames::init();
Search::init();
Threads.set(Options["Threads"]);
Search::clear(); // After threads are up

1
src/pawns.h
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@ -59,7 +59,6 @@ struct Entry {
Square kingSquares[COLOR_NB];
Score kingSafety[COLOR_NB];
int castlingRights[COLOR_NB];
int pawnsOnSquares[COLOR_NB][COLOR_NB]; // [color][light/dark squares]
};
typedef HashTable<Entry, 16384> Table;

12
src/position.cpp
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@ -387,7 +387,7 @@ void Position::set_state(StateInfo* si) const {
if (type_of(pc) == PAWN)
si->pawnKey ^= Zobrist::psq[pc][s];
else if (type_of(pc) != PAWN && type_of(pc) != KING)
else if (type_of(pc) != KING)
si->nonPawnMaterial[color_of(pc)] += PieceValue[MG][pc];
}
@ -491,7 +491,7 @@ Bitboard Position::slider_blockers(Bitboard sliders, Square s, Bitboard& pinners
// Snipers are sliders that attack 's' when a piece and other snipers are removed
Bitboard snipers = ( (PseudoAttacks[ ROOK][s] & pieces(QUEEN, ROOK))
| (PseudoAttacks[BISHOP][s] & pieces(QUEEN, BISHOP))) & sliders;
Bitboard occupancy = pieces() & ~snipers;
Bitboard occupancy = pieces() ^ snipers;
while (snipers)
{
@ -1192,10 +1192,10 @@ bool Position::has_game_cycle(int ply) const {
if (ply > i)
return true;
// For nodes before or at the root, check that the move is a repetition one
// rather than a move to the current position.
// In the cuckoo table, both moves Rc1c5 and Rc5c1 are stored in the same
// location, so we have to select which square to check.
// For nodes before or at the root, check that the move is a
// repetition rather than a move to the current position.
// In the cuckoo table, both moves Rc1c5 and Rc5c1 are stored in
// the same location, so we have to select which square to check.
if (color_of(piece_on(empty(s1) ? s2 : s1)) != side_to_move())
continue;

45
src/search.cpp
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@ -149,7 +149,7 @@ namespace {
void Search::init() {
for (int i = 1; i < MAX_MOVES; ++i)
Reductions[i] = int(22.9 * std::log(i));
Reductions[i] = int(22.9 * std::log(i));
}
@ -240,17 +240,13 @@ void MainThread::search() {
minScore = std::min(minScore, th->rootMoves[0].score);
// Vote according to score and depth, and select the best thread
int64_t bestVote = 0;
for (Thread* th : Threads)
{
votes[th->rootMoves[0].pv[0]] +=
(th->rootMoves[0].score - minScore + 14) * int(th->completedDepth);
(th->rootMoves[0].score - minScore + 14) * int(th->completedDepth);
if (votes[th->rootMoves[0].pv[0]] > bestVote)
{
bestVote = votes[th->rootMoves[0].pv[0]];
if (votes[th->rootMoves[0].pv[0]] > votes[bestThread->rootMoves[0].pv[0]])
bestThread = th;
}
}
}
@ -538,13 +534,13 @@ namespace {
bool ttHit, ttPv, inCheck, givesCheck, improving;
bool captureOrPromotion, doFullDepthSearch, moveCountPruning, ttCapture;
Piece movedPiece;
int moveCount, captureCount, quietCount;
int moveCount, captureCount, quietCount, singularLMR;
// Step 1. Initialize node
Thread* thisThread = pos.this_thread();
inCheck = pos.checkers();
Color us = pos.side_to_move();
moveCount = captureCount = quietCount = ss->moveCount = 0;
moveCount = captureCount = quietCount = singularLMR = ss->moveCount = 0;
bestValue = -VALUE_INFINITE;
maxValue = VALUE_INFINITE;
@ -589,10 +585,10 @@ namespace {
// starts with statScore = 0. Later grandchildren start with the last calculated
// statScore of the previous grandchild. This influences the reduction rules in
// LMR which are based on the statScore of parent position.
if (rootNode)
(ss + 4)->statScore = 0;
else
(ss + 2)->statScore = 0;
if (rootNode)
(ss + 4)->statScore = 0;
else
(ss + 2)->statScore = 0;
// Step 4. Transposition table lookup. We don't want the score of a partial
// search to overwrite a previous full search TT value, so we use a different
@ -850,7 +846,6 @@ moves_loop: // When in check, search starts from here
value = bestValue; // Workaround a bogus 'uninitialized' warning under gcc
moveCountPruning = false;
ttCapture = ttMove && pos.capture_or_promotion(ttMove);
int singularExtensionLMRmultiplier = 0;
// Step 12. Loop through all pseudo-legal moves until no moves remain
// or a beta cutoff occurs.
@ -907,12 +902,13 @@ moves_loop: // When in check, search starts from here
ss->excludedMove = MOVE_NONE;
if (value < singularBeta)
{
{
extension = ONE_PLY;
singularExtensionLMRmultiplier++;
singularLMR++;
if (value < singularBeta - std::min(3 * depth / ONE_PLY, 39))
singularExtensionLMRmultiplier++;
}
singularLMR++;
}
// Multi-cut pruning
// Our ttMove is assumed to fail high, and now we failed high also on a reduced
@ -1023,8 +1019,9 @@ moves_loop: // When in check, search starts from here
// Decrease reduction if opponent's move count is high (~10 Elo)
if ((ss-1)->moveCount > 15)
r -= ONE_PLY;
// Decrease reduction if move has been singularly extended
r -= singularExtensionLMRmultiplier * ONE_PLY;
r -= singularLMR * ONE_PLY;
if (!captureOrPromotion)
{
@ -1060,7 +1057,7 @@ moves_loop: // When in check, search starts from here
r -= ss->statScore / 20000 * ONE_PLY;
}
Depth d = std::max(newDepth - std::max(r, DEPTH_ZERO), ONE_PLY);
Depth d = clamp(newDepth - r, ONE_PLY, newDepth);
value = -search<NonPV>(pos, ss+1, -(alpha+1), -alpha, d, true);
@ -1476,7 +1473,7 @@ moves_loop: // When in check, search starts from here
void update_capture_stats(const Position& pos, Move move,
Move* captures, int captureCount, int bonus) {
CapturePieceToHistory& captureHistory = pos.this_thread()->captureHistory;
CapturePieceToHistory& captureHistory = pos.this_thread()->captureHistory;
Piece moved_piece = pos.moved_piece(move);
PieceType captured = type_of(pos.piece_on(to_sq(move)));
@ -1715,10 +1712,4 @@ void Tablebases::rank_root_moves(Position& pos, Search::RootMoves& rootMoves) {
if (dtz_available || rootMoves[0].tbScore <= VALUE_DRAW)
Cardinality = 0;
}
else
{
// Assign the same rank to all moves
for (auto& m : rootMoves)
m.tbRank = 0;
}
}

2
src/search.h
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@ -69,7 +69,7 @@ struct RootMove {
Value score = -VALUE_INFINITE;
Value previousScore = -VALUE_INFINITE;
int selDepth = 0;
int tbRank;
int tbRank = 0;
Value tbScore;
std::vector<Move> pv;
};

7
src/tt.cpp
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@ -43,15 +43,16 @@ void TTEntry::save(Key k, Value v, bool pv, Bound b, Depth d, Move m, Value ev)
// Overwrite less valuable entries
if ( (k >> 48) != key16
|| d / ONE_PLY + 10 > depth8
||(d - DEPTH_OFFSET) / ONE_PLY > depth8 - 4
|| b == BOUND_EXACT)
{
assert((d - DEPTH_OFFSET) / ONE_PLY >= 0);
key16 = (uint16_t)(k >> 48);
value16 = (int16_t)v;
eval16 = (int16_t)ev;
genBound8 = (uint8_t)(TT.generation8 | uint8_t(pv) << 2 | b);
assert((d - DEPTH_NONE) / ONE_PLY >= 0);
depth8 = (uint8_t)((d - DEPTH_NONE) / ONE_PLY);
depth8 = (uint8_t)((d - DEPTH_OFFSET) / ONE_PLY);
}
}

2
src/tt.h
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@ -40,7 +40,7 @@ struct TTEntry {
Move move() const { return (Move )move16; }
Value value() const { return (Value)value16; }
Value eval() const { return (Value)eval16; }
Depth depth() const { return (Depth)(depth8 * int(ONE_PLY)) + DEPTH_NONE; }
Depth depth() const { return (Depth)(depth8 * int(ONE_PLY)) + DEPTH_OFFSET; }
bool is_pv() const { return (bool)(genBound8 & 0x4); }
Bound bound() const { return (Bound)(genBound8 & 0x3); }
void save(Key k, Value v, bool pv, Bound b, Depth d, Move m, Value ev);

5
src/types.h
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@ -213,8 +213,9 @@ enum Depth : int {
DEPTH_QS_NO_CHECKS = -1 * ONE_PLY,
DEPTH_QS_RECAPTURES = -5 * ONE_PLY,
DEPTH_NONE = -6 * ONE_PLY,
DEPTH_MAX = MAX_PLY * ONE_PLY
DEPTH_NONE = -6 * ONE_PLY,
DEPTH_OFFSET = DEPTH_NONE,
DEPTH_MAX = MAX_PLY * ONE_PLY
};
static_assert(!(ONE_PLY & (ONE_PLY - 1)), "ONE_PLY is not a power of 2");