Value search(Position& pos, SearchStack* ss, Value alpha, Value beta, Depth depth, int ply);
template <NodeType PvNode>
- inline Value search(Position& pos, SearchStack* ss, Value alpha, Value beta, Depth depth, int ply) {
- return search<PvNode, false>(pos, ss, alpha, beta, depth, ply);
- }
+ Value qsearch(Position& pos, SearchStack* ss, Value alpha, Value beta, Depth depth, int ply);
template <NodeType PvNode>
- Value qsearch(Position& pos, SearchStack* ss, Value alpha, Value beta, Depth depth, int ply);
+ inline Value search(Position& pos, SearchStack* ss, Value alpha, Value beta, Depth depth, int ply) {
+
+ return depth < ONE_PLY ? qsearch<PvNode>(pos, ss, alpha, beta, DEPTH_ZERO, ply)
+ : search<PvNode, false>(pos, ss, alpha, beta, depth, ply);
+ }
template <NodeType PvNode>
Depth extension(const Position& pos, Move m, bool captureOrPromotion, bool moveIsCheck, bool singleEvasion, bool mateThreat, bool* dangerous);
}
// Step 2. Check for aborted search and immediate draw
- if (AbortSearch || ThreadsMgr.thread_should_stop(threadID))
- return VALUE_DRAW;
-
- if (pos.is_draw() || ply >= PLY_MAX - 1)
+ if ( AbortSearch || ThreadsMgr.thread_should_stop(threadID)
+ || pos.is_draw() || ply >= PLY_MAX - 1)
return VALUE_DRAW;
// Step 3. Mate distance pruning
posKey = excludedMove ? pos.get_exclusion_key() : pos.get_key();
tte = TT.retrieve(posKey);
- ttMove = (tte ? tte->move() : MOVE_NONE);
+ ttMove = tte ? tte->move() : MOVE_NONE;
// At PV nodes, we don't use the TT for pruning, but only for move ordering.
// This is to avoid problems in the following areas:
// * Fifty move rule detection
// * Searching for a mate
// * Printing of full PV line
-
if (!PvNode && tte && ok_to_use_TT(tte, depth, beta, ply))
{
- // Refresh tte entry to avoid aging
- TT.store(posKey, tte->value(), tte->type(), tte->depth(), ttMove, tte->static_value(), tte->static_value_margin());
-
+ TT.refresh(tte);
ss->bestMove = ttMove; // Can be MOVE_NONE
return value_from_tt(tte->value(), ply);
}
pos.do_null_move(st);
(ss+1)->skipNullMove = true;
-
- nullValue = depth-R*ONE_PLY < ONE_PLY ? -qsearch<NonPV>(pos, ss+1, -beta, -alpha, DEPTH_ZERO, ply+1)
- : - search<NonPV>(pos, ss+1, -beta, -alpha, depth-R*ONE_PLY, ply+1);
+ nullValue = -search<NonPV>(pos, ss+1, -beta, -alpha, depth-R*ONE_PLY, ply+1);
(ss+1)->skipNullMove = false;
pos.undo_null_move();
&& (move = mp.get_next_move()) != MOVE_NONE
&& !ThreadsMgr.thread_should_stop(threadID))
{
+ assert(move_is_ok(move));
+
if (SpNode)
{
moveCount = ++sp->moveCount;
lock_release(&(sp->lock));
}
-
- assert(move_is_ok(move));
-
- if (move == excludedMove)
+ else if (move == excludedMove)
continue;
+ else
+ movesSearched[moveCount++] = move;
moveIsCheck = pos.move_is_check(move, ci);
captureOrPromotion = pos.move_is_capture_or_promotion(move);
}
}
- newDepth = depth - ONE_PLY + ext;
-
// Update current move (this must be done after singular extension search)
- movesSearched[moveCount] = ss->currentMove = move;
-
- if (!SpNode)
- moveCount++;
+ ss->currentMove = move;
+ newDepth = depth - ONE_PLY + ext;
// Step 12. Futility pruning (is omitted in PV nodes)
if ( !PvNode
// Step extra. pv search (only in PV nodes)
// The first move in list is the expected PV
if (!SpNode && PvNode && moveCount == 1)
- value = newDepth < ONE_PLY ? -qsearch<PV>(pos, ss+1, -beta, -alpha, DEPTH_ZERO, ply+1)
- : - search<PV>(pos, ss+1, -beta, -alpha, newDepth, ply+1);
+ value = -search<PV>(pos, ss+1, -beta, -alpha, newDepth, ply+1);
else
{
// Step 14. Reduced depth search
{
alpha = SpNode ? sp->alpha : alpha;
Depth d = newDepth - ss->reduction;
- value = d < ONE_PLY ? -qsearch<NonPV>(pos, ss+1, -(alpha+1), -alpha, DEPTH_ZERO, ply+1)
- : - search<NonPV>(pos, ss+1, -(alpha+1), -alpha, d, ply+1);
+ value = -search<NonPV>(pos, ss+1, -(alpha+1), -alpha, d, ply+1);
doFullDepthSearch = (value > alpha);
}
if (doFullDepthSearch)
{
alpha = SpNode ? sp->alpha : alpha;
- value = newDepth < ONE_PLY ? -qsearch<NonPV>(pos, ss+1, -(alpha+1), -alpha, DEPTH_ZERO, ply+1)
- : - search<NonPV>(pos, ss+1, -(alpha+1), -alpha, newDepth, ply+1);
+ value = -search<NonPV>(pos, ss+1, -(alpha+1), -alpha, newDepth, ply+1);
// 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 < ONE_PLY ? -qsearch<PV>(pos, ss+1, -beta, -alpha, DEPTH_ZERO, ply+1)
- : - search<PV>(pos, ss+1, -beta, -alpha, newDepth, ply+1);
+ value = -search<PV>(pos, ss+1, -beta, -alpha, newDepth, ply+1);
}
}
if (SpNode)
{
- /* Here we have the lock still grabbed */
+ // Here we have the lock still grabbed
sp->slaves[threadID] = 0;
lock_release(&(sp->lock));
return bestValue;
assert(threadID >= 0 && threadID < MAX_THREADS);
- int i;
- bool allFinished = false;
-
while (true)
{
// Slave threads can exit as soon as AllThreadsShouldExit raises,
// instead of wasting CPU time polling for work.
while ( threadID >= ActiveThreads
|| threads[threadID].state == THREAD_INITIALIZING
- || threads[threadID].state == THREAD_AVAILABLE)
+ || (!sp && threads[threadID].state == THREAD_AVAILABLE))
{
- lock_grab(&MPLock);
+ assert(!sp);
+ assert(threadID != 0);
+
+ if (AllThreadsShouldExit)
+ break;
- // Test with lock held to avoid races with wake_sleeping_thread()
- for (i = 0; sp && i < ActiveThreads && !sp->slaves[i]; i++) {}
- allFinished = (i == ActiveThreads);
+ lock_grab(&MPLock);
- // Retest sleep conditions under lock protection
- if ( AllThreadsShouldExit
- || allFinished
- || !( threadID >= ActiveThreads
- || threads[threadID].state == THREAD_INITIALIZING
- || threads[threadID].state == THREAD_AVAILABLE))
+ // Retest condition under lock protection
+ if (!( threadID >= ActiveThreads
+ || threads[threadID].state == THREAD_INITIALIZING
+ || (!sp && threads[threadID].state == THREAD_AVAILABLE)))
{
lock_release(&MPLock);
- break;
+ continue;
}
// Put thread to sleep
assert(threads[threadID].state == THREAD_SEARCHING);
threads[threadID].state = THREAD_AVAILABLE;
-
- // Wake up master thread so to allow it to return from the idle loop in
- // case we are the last slave of the split point.
- if (threadID != tsp->master && threads[tsp->master].state == THREAD_AVAILABLE)
- wake_sleeping_thread(tsp->master);
}
// If this thread is the master of a split point and all slaves have
// finished their work at this split point, return from the idle loop.
- for (i = 0; sp && i < ActiveThreads && !sp->slaves[i]; i++) {}
- allFinished = (i == ActiveThreads);
+ int i = 0;
+ for ( ; sp && i < ActiveThreads && !sp->slaves[i]; i++) {}
- if (allFinished)
+ if (i == ActiveThreads)
{
// Because sp->slaves[] is reset under lock protection,
// be sure sp->lock has been released before to return.
#if !defined(_MSC_VER)
pthread_t pthread[1];
ok = (pthread_create(pthread, NULL, init_thread, (void*)(&i)) == 0);
+ pthread_detach(pthread[0]);
#else
ok = (CreateThread(NULL, 0, init_thread, (LPVOID)(&i), 0, NULL) != NULL);
#endif
// Initialize the split point object
splitPoint.parent = masterThread.splitPoint;
- splitPoint.master = master;
splitPoint.stopRequest = false;
splitPoint.ply = ply;
splitPoint.depth = depth;
projects / stockfish / blobdiff