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Do not pass threadID as argument of search() and evaluate()

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Get it from the position instead.

A good semplification of function calling and a speedup too.

No functional change also with faked split.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2010-06-02 20:37:18 +01:00
parent 2f6927ac08
commit ab127028ed
4 changed files with 56 additions and 56 deletions
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92
src/search.cpp
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@@ -90,7 +90,7 @@ namespace {
template <bool Fake>
void split(const Position& pos, SearchStack* ss, Value* alpha, const Value beta, Value* bestValue,
Depth depth, bool mateThreat, int* moveCount, MovePicker* mp, int master, bool pvNode);
Depth depth, bool mateThreat, int* moveCount, MovePicker* mp, bool pvNode);
private:
friend void poll();
@@ -285,10 +285,10 @@ namespace {
Value root_search(Position& pos, SearchStack* ss, RootMoveList& rml, Value* alphaPtr, Value* betaPtr);
template <NodeType PvNode>
Value search(Position& pos, SearchStack* ss, Value alpha, Value beta, Depth depth, int threadID);
Value search(Position& pos, SearchStack* ss, Value alpha, Value beta, Depth depth);
template <NodeType PvNode>
Value qsearch(Position& pos, SearchStack* ss, Value alpha, Value beta, Depth depth, int threadID);
Value qsearch(Position& pos, SearchStack* ss, Value alpha, Value beta, Depth depth);
template <NodeType PvNode>
void sp_search(SplitPoint* sp, int threadID);
@@ -811,7 +811,7 @@ namespace {
// Step 5. Evaluate the position statically
// At root we do this only to get reference value for child nodes
if (!isCheck)
ss->eval = evaluate(pos, ei, 0);
ss->eval = evaluate(pos, ei);
// Step 6. Razoring (omitted at root)
// Step 7. Static null move pruning (omitted at root)
@@ -876,7 +876,7 @@ namespace {
alpha = -VALUE_INFINITE;
// Full depth PV search, done on first move or after a fail high
value = -search<PV>(pos, ss+1, -beta, -alpha, newDepth, 0);
value = -search<PV>(pos, ss+1, -beta, -alpha, newDepth);
}
else
{
@@ -893,7 +893,7 @@ namespace {
if (ss->reduction)
{
// Reduced depth non-pv search using alpha as upperbound
value = -search<NonPV>(pos, ss+1, -(alpha+1), -alpha, newDepth-ss->reduction, 0);
value = -search<NonPV>(pos, ss+1, -(alpha+1), -alpha, newDepth-ss->reduction);
doFullDepthSearch = (value > alpha);
}
}
@@ -903,12 +903,12 @@ namespace {
{
// Full depth non-pv search using alpha as upperbound
ss->reduction = Depth(0);
value = -search<NonPV>(pos, ss+1, -(alpha+1), -alpha, newDepth, 0);
value = -search<NonPV>(pos, ss+1, -(alpha+1), -alpha, newDepth);
// If we are above alpha then research at same depth but as PV
// to get a correct score or eventually a fail high above beta.
if (value > alpha)
value = -search<PV>(pos, ss+1, -beta, -alpha, newDepth, 0);
value = -search<PV>(pos, ss+1, -beta, -alpha, newDepth);
}
}
@@ -1031,13 +1031,13 @@ namespace {
// search<>() is the main search function for both PV and non-PV nodes
template <NodeType PvNode>
Value search(Position& pos, SearchStack* ss, Value alpha, Value beta, Depth depth, int threadID) {
Value search(Position& pos, SearchStack* ss, Value alpha, Value beta, Depth depth) {
assert(alpha >= -VALUE_INFINITE && alpha <= VALUE_INFINITE);
assert(beta > alpha && beta <= VALUE_INFINITE);
assert(PvNode || alpha == beta - 1);
assert(pos.ply() > 0 && pos.ply() < PLY_MAX);
assert(threadID >= 0 && threadID < TM.active_threads());
assert(pos.thread() >= 0 && pos.thread() < TM.active_threads());
Move movesSearched[256];
EvalInfo ei;
@@ -1051,6 +1051,7 @@ namespace {
bool isCheck, singleEvasion, moveIsCheck, captureOrPromotion, dangerous;
bool mateThreat = false;
int moveCount = 0;
int threadID = pos.thread();
int ply = pos.ply();
refinedValue = bestValue = value = -VALUE_INFINITE;
oldAlpha = alpha;
@@ -1117,7 +1118,7 @@ namespace {
ei.kingDanger[pos.side_to_move()] = tte->king_danger();
}
else
ss->eval = evaluate(pos, ei, threadID);
ss->eval = evaluate(pos, ei);
refinedValue = refine_eval(tte, ss->eval, ply); // Enhance accuracy with TT value if possible
update_gains(pos, (ss-1)->currentMove, (ss-1)->eval, ss->eval);
@@ -1134,7 +1135,7 @@ namespace {
&& !pos.has_pawn_on_7th(pos.side_to_move()))
{
Value rbeta = beta - razor_margin(depth);
Value v = qsearch<NonPV>(pos, ss, rbeta-1, rbeta, Depth(0), threadID);
Value v = qsearch<NonPV>(pos, ss, rbeta-1, rbeta, Depth(0));
if (v < rbeta)
// Logically we should return (v + razor_margin(depth)), but
// surprisingly this did slightly weaker in tests.
@@ -1175,14 +1176,11 @@ namespace {
R++;
pos.do_null_move(st);
(ss+1)->skipNullMove = true;
nullValue = depth-R*OnePly < OnePly ? -qsearch<NonPV>(pos, ss+1, -beta, -alpha, Depth(0), threadID)
: - search<NonPV>(pos, ss+1, -beta, -alpha, depth-R*OnePly, threadID);
nullValue = depth-R*OnePly < OnePly ? -qsearch<NonPV>(pos, ss+1, -beta, -alpha, Depth(0))
: - search<NonPV>(pos, ss+1, -beta, -alpha, depth-R*OnePly);
(ss+1)->skipNullMove = false;
pos.undo_null_move();
if (nullValue >= beta)
@@ -1196,10 +1194,10 @@ namespace {
return nullValue;
ss->skipNullMove = true;
Value v = search<NonPV>(pos, ss, alpha, beta, depth-5*OnePly, threadID);
Value v = search<NonPV>(pos, ss, alpha, beta, depth-5*OnePly);
ss->skipNullMove = false;
if (v >= beta)
if (v >= beta)
return nullValue;
}
else
@@ -1229,7 +1227,7 @@ namespace {
Depth d = (PvNode ? depth - 2 * OnePly : depth / 2);
ss->skipNullMove = true;
search<PvNode>(pos, ss, alpha, beta, d, threadID);
search<PvNode>(pos, ss, alpha, beta, d);
ss->skipNullMove = false;
ttMove = ss->pv[ply];
@@ -1281,7 +1279,7 @@ namespace {
Value b = ttValue - SingularExtensionMargin;
ss->excludedMove = move;
ss->skipNullMove = true;
Value v = search<NonPV>(pos, ss, b - 1, b, depth / 2, threadID);
Value v = search<NonPV>(pos, ss, b - 1, b, depth / 2);
ss->skipNullMove = false;
ss->excludedMove = MOVE_NONE;
@@ -1330,8 +1328,8 @@ namespace {
// Step extra. pv search (only in PV nodes)
// The first move in list is the expected PV
if (PvNode && moveCount == 1)
value = newDepth < OnePly ? -qsearch<PV>(pos, ss+1, -beta, -alpha, Depth(0), threadID)
: - search<PV>(pos, ss+1, -beta, -alpha, newDepth, threadID);
value = newDepth < OnePly ? -qsearch<PV>(pos, ss+1, -beta, -alpha, Depth(0))
: - search<PV>(pos, ss+1, -beta, -alpha, newDepth);
else
{
// Step 14. Reduced depth search
@@ -1348,8 +1346,8 @@ namespace {
if (ss->reduction)
{
Depth d = newDepth - ss->reduction;
value = d < OnePly ? -qsearch<NonPV>(pos, ss+1, -(alpha+1), -alpha, Depth(0), threadID)
: - search<NonPV>(pos, ss+1, -(alpha+1), -alpha, d, threadID);
value = d < OnePly ? -qsearch<NonPV>(pos, ss+1, -(alpha+1), -alpha, Depth(0))
: - search<NonPV>(pos, ss+1, -(alpha+1), -alpha, d);
doFullDepthSearch = (value > alpha);
}
@@ -1362,7 +1360,7 @@ namespace {
assert(newDepth - OnePly >= OnePly);
ss->reduction = OnePly;
value = -search<NonPV>(pos, ss+1, -(alpha+1), -alpha, newDepth-ss->reduction, threadID);
value = -search<NonPV>(pos, ss+1, -(alpha+1), -alpha, newDepth-ss->reduction);
doFullDepthSearch = (value > alpha);
}
ss->reduction = Depth(0); // Restore original reduction
@@ -1371,15 +1369,15 @@ namespace {
// Step 15. Full depth search
if (doFullDepthSearch)
{
value = newDepth < OnePly ? -qsearch<NonPV>(pos, ss+1, -(alpha+1), -alpha, Depth(0), threadID)
: - search<NonPV>(pos, ss+1, -(alpha+1), -alpha, newDepth, threadID);
value = newDepth < OnePly ? -qsearch<NonPV>(pos, ss+1, -(alpha+1), -alpha, Depth(0))
: - search<NonPV>(pos, ss+1, -(alpha+1), -alpha, newDepth);
// Step extra. pv search (only in PV nodes)
// Search only for possible new PV nodes, if instead value >= beta then
// parent node fails low with value <= alpha and tries another move.
if (PvNode && value > alpha && value < beta)
value = newDepth < OnePly ? -qsearch<PV>(pos, ss+1, -beta, -alpha, Depth(0), threadID)
: - search<PV>(pos, ss+1, -beta, -alpha, newDepth, threadID);
value = newDepth < OnePly ? -qsearch<PV>(pos, ss+1, -beta, -alpha, Depth(0))
: - search<PV>(pos, ss+1, -beta, -alpha, newDepth);
}
}
@@ -1413,7 +1411,7 @@ namespace {
&& !TM.thread_should_stop(threadID)
&& Iteration <= 99)
TM.split<FakeSplit>(pos, ss, &alpha, beta, &bestValue, depth,
mateThreat, &moveCount, &mp, threadID, PvNode);
mateThreat, &moveCount, &mp, PvNode);
}
// Step 19. Check for mate and stalemate
@@ -1457,14 +1455,14 @@ namespace {
// less than OnePly).
template <NodeType PvNode>
Value qsearch(Position& pos, SearchStack* ss, Value alpha, Value beta, Depth depth, int threadID) {
Value qsearch(Position& pos, SearchStack* ss, Value alpha, Value beta, Depth depth) {
assert(alpha >= -VALUE_INFINITE && alpha <= VALUE_INFINITE);
assert(beta >= -VALUE_INFINITE && beta <= VALUE_INFINITE);
assert(PvNode || alpha == beta - 1);
assert(depth <= 0);
assert(pos.ply() > 0 && pos.ply() < PLY_MAX);
assert(threadID >= 0 && threadID < TM.active_threads());
assert(pos.thread() >= 0 && pos.thread() < TM.active_threads());
EvalInfo ei;
StateInfo st;
@@ -1476,7 +1474,7 @@ namespace {
int ply = pos.ply();
Value oldAlpha = alpha;
TM.incrementNodeCounter(threadID);
TM.incrementNodeCounter(pos.thread());
ss->init(ply);
// Check for an instant draw or maximum ply reached
@@ -1505,7 +1503,7 @@ namespace {
ei.kingDanger[pos.side_to_move()] = tte->king_danger();
}
else
staticValue = evaluate(pos, ei, threadID);
staticValue = evaluate(pos, ei);
if (!isCheck)
{
@@ -1591,7 +1589,7 @@ namespace {
// Make and search the move
pos.do_move(move, st, ci, moveIsCheck);
value = -qsearch<PvNode>(pos, ss+1, -beta, -alpha, depth-OnePly, threadID);
value = -qsearch<PvNode>(pos, ss+1, -beta, -alpha, depth-OnePly);
pos.undo_move(move);
assert(value > -VALUE_INFINITE && value < VALUE_INFINITE);
@@ -1739,8 +1737,8 @@ namespace {
{
Value localAlpha = sp->alpha;
Depth d = newDepth - ss->reduction;
value = d < OnePly ? -qsearch<NonPV>(pos, ss+1, -(localAlpha+1), -localAlpha, Depth(0), threadID)
: - search<NonPV>(pos, ss+1, -(localAlpha+1), -localAlpha, d, threadID);
value = d < OnePly ? -qsearch<NonPV>(pos, ss+1, -(localAlpha+1), -localAlpha, Depth(0))
: - search<NonPV>(pos, ss+1, -(localAlpha+1), -localAlpha, d);
doFullDepthSearch = (value > localAlpha);
}
@@ -1753,7 +1751,7 @@ namespace {
ss->reduction = OnePly;
Value localAlpha = sp->alpha;
value = -search<NonPV>(pos, ss+1, -(localAlpha+1), -localAlpha, newDepth-ss->reduction, threadID);
value = -search<NonPV>(pos, ss+1, -(localAlpha+1), -localAlpha, newDepth-ss->reduction);
doFullDepthSearch = (value > localAlpha);
}
ss->reduction = Depth(0); // Restore original reduction
@@ -1763,15 +1761,15 @@ namespace {
if (doFullDepthSearch)
{
Value localAlpha = sp->alpha;
value = newDepth < OnePly ? -qsearch<NonPV>(pos, ss+1, -(localAlpha+1), -localAlpha, Depth(0), threadID)
: - search<NonPV>(pos, ss+1, -(localAlpha+1), -localAlpha, newDepth, threadID);
value = newDepth < OnePly ? -qsearch<NonPV>(pos, ss+1, -(localAlpha+1), -localAlpha, Depth(0))
: - search<NonPV>(pos, ss+1, -(localAlpha+1), -localAlpha, newDepth);
// Step extra. pv search (only in PV nodes)
// Search only for possible new PV nodes, if instead value >= beta then
// parent node fails low with value <= alpha and tries another move.
if (PvNode && value > localAlpha && value < sp->beta)
value = newDepth < OnePly ? -qsearch<PV>(pos, ss+1, -sp->beta, -sp->alpha, Depth(0), threadID)
: - search<PV>(pos, ss+1, -sp->beta, -sp->alpha, newDepth, threadID);
value = newDepth < OnePly ? -qsearch<PV>(pos, ss+1, -sp->beta, -sp->alpha, Depth(0))
: - search<PV>(pos, ss+1, -sp->beta, -sp->alpha, newDepth);
}
// Step 16. Undo move
@@ -2621,16 +2619,18 @@ namespace {
template <bool Fake>
void ThreadsManager::split(const Position& p, SearchStack* ss, Value* alpha, const Value beta,
Value* bestValue, Depth depth, bool mateThreat, int* moveCount,
MovePicker* mp, int master, bool pvNode) {
MovePicker* mp, bool pvNode) {
assert(p.is_ok());
assert(*bestValue >= -VALUE_INFINITE);
assert(*bestValue <= *alpha);
assert(*alpha < beta);
assert(beta <= VALUE_INFINITE);
assert(depth > Depth(0));
assert(master >= 0 && master < ActiveThreads);
assert(p.thread() >= 0 && p.thread() < ActiveThreads);
assert(ActiveThreads > 1);
int master = p.thread();
lock_grab(&MPLock);
// If no other thread is available to help us, or if we have too many
@@ -2782,7 +2782,7 @@ namespace {
init_ss_array(ss, PLY_MAX_PLUS_2);
pos.do_move(cur->move, st);
moves[count].move = cur->move;
moves[count].score = -qsearch<PV>(pos, ss+1, -VALUE_INFINITE, VALUE_INFINITE, Depth(0), 0);
moves[count].score = -qsearch<PV>(pos, ss+1, -VALUE_INFINITE, VALUE_INFINITE, Depth(0));
moves[count].pv[0] = cur->move;
moves[count].pv[1] = MOVE_NONE;
pos.undo_move(cur->move);