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Code Issues Releases Wiki Activity

Space inflate sp_search

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Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2008-09-09 11:15:58 +02:00
parent a10c9632a5
commit eacb42092b
1 changed files with 59 additions and 44 deletions
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103
src/search.cpp
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@ -935,7 +935,7 @@ namespace {
else else
value = alpha + 1; // Just to trigger next condition value = alpha + 1; // Just to trigger next condition
if (value > alpha) // Go with full depth non-pv search if (value > alpha) // Go with full depth pv search
{ {
ss[ply].reduction = Depth(0); ss[ply].reduction = Depth(0);
value = -search(pos, ss, -alpha, newDepth, ply+1, true, threadID); value = -search(pos, ss, -alpha, newDepth, ply+1, true, threadID);
@ -1417,6 +1417,7 @@ namespace {
// care of after we return from the split point. // care of after we return from the split point.
void sp_search(SplitPoint *sp, int threadID) { void sp_search(SplitPoint *sp, int threadID) {
assert(threadID >= 0 && threadID < ActiveThreads); assert(threadID >= 0 && threadID < ActiveThreads);
assert(ActiveThreads > 1); assert(ActiveThreads > 1);
@ -1424,73 +1425,87 @@ namespace {
SearchStack *ss = sp->sstack[threadID]; SearchStack *ss = sp->sstack[threadID];
Value value; Value value;
Move move; Move move;
int moveCount = sp->moves;
bool isCheck = pos.is_check(); bool isCheck = pos.is_check();
bool useFutilityPruning = bool useFutilityPruning = UseFutilityPruning
UseFutilityPruning && sp->depth < SelectiveDepth && !isCheck; && sp->depth < SelectiveDepth
&& !isCheck;
while ( sp->bestValue < sp->beta
&& !thread_should_stop(threadID)
&& (move = sp->mp->get_next_move(sp->lock)) != MOVE_NONE)
{
assert(move_is_ok(move));
while(sp->bestValue < sp->beta && !thread_should_stop(threadID)
&& (move = sp->mp->get_next_move(sp->lock)) != MOVE_NONE) {
UndoInfo u;
Depth ext, newDepth;
bool moveIsCheck = pos.move_is_check(move, sp->dcCandidates); bool moveIsCheck = pos.move_is_check(move, sp->dcCandidates);
bool moveIsCapture = pos.move_is_capture(move); bool moveIsCapture = pos.move_is_capture(move);
bool moveIsPassedPawnPush = pos.move_is_passed_pawn_push(move); bool moveIsPassedPawnPush = pos.move_is_passed_pawn_push(move);
assert(move_is_ok(move));
lock_grab(&(sp->lock)); lock_grab(&(sp->lock));
sp->moves++; int moveCount = ++sp->moves;
moveCount = sp->moves;
lock_release(&(sp->lock)); lock_release(&(sp->lock));
ss[sp->ply].currentMove = move; ss[sp->ply].currentMove = move;
// Decide the new search depth. // Decide the new search depth.
ext = extension(pos, move, false, moveIsCheck, false, false); Depth ext = extension(pos, move, false, moveIsCheck, false, false);
newDepth = sp->depth - OnePly + ext; Depth newDepth = sp->depth - OnePly + ext;
// Prune? // Prune?
if(useFutilityPruning && ext == Depth(0) && !moveIsCapture if ( useFutilityPruning
&& !moveIsPassedPawnPush && !move_promotion(move) && ext == Depth(0)
&& moveCount >= 2 + int(sp->depth) && !moveIsCapture
&& ok_to_prune(pos, move, ss[sp->ply].threatMove, sp->depth)) && !moveIsPassedPawnPush
&& !move_promotion(move)
&& moveCount >= 2 + int(sp->depth)
&& ok_to_prune(pos, move, ss[sp->ply].threatMove, sp->depth))
continue; continue;
// Make and search the move. // Make and search the move.
UndoInfo u;
pos.do_move(move, u, sp->dcCandidates); pos.do_move(move, u, sp->dcCandidates);
if(ext == Depth(0) && moveCount >= LMRNonPVMoves
&& !moveIsCapture && !move_promotion(move) && !moveIsPassedPawnPush // Try to reduce non-pv search depth by one ply if move seems not problematic,
&& !move_is_castle(move) // if the move fails high will be re-searched at full depth.
&& move != ss[sp->ply].killer1 && move != ss[sp->ply].killer2) { if ( ext == Depth(0)
ss[sp->ply].reduction = OnePly; && moveCount >= LMRNonPVMoves
value = -search(pos, ss, -(sp->beta-1), newDepth - OnePly, sp->ply+1, && !moveIsCapture
true, threadID); && !moveIsPassedPawnPush
&& !move_promotion(move)
&& !move_is_castle(move)
&& move != ss[sp->ply].killer1
&& move != ss[sp->ply].killer2)
{
ss[sp->ply].reduction = OnePly;
value = -search(pos, ss, -(sp->beta-1), newDepth - OnePly, sp->ply+1, true, threadID);
} }
else else
value = sp->beta; value = sp->beta; // Just to trigger next condition
if(value >= sp->beta) {
ss[sp->ply].reduction = Depth(0); if (value >= sp->beta) // Go with full depth non-pv search
value = -search(pos, ss, -(sp->beta - 1), newDepth, sp->ply+1, true, {
threadID); ss[sp->ply].reduction = Depth(0);
value = -search(pos, ss, -(sp->beta - 1), newDepth, sp->ply+1, true, threadID);
} }
pos.undo_move(move, u); pos.undo_move(move, u);
assert(value > -VALUE_INFINITE && value < VALUE_INFINITE); assert(value > -VALUE_INFINITE && value < VALUE_INFINITE);
if(thread_should_stop(threadID)) if (thread_should_stop(threadID))
break; break;
// New best move? // New best move?
lock_grab(&(sp->lock)); lock_grab(&(sp->lock));
if(value > sp->bestValue && !thread_should_stop(threadID)) { if (value > sp->bestValue && !thread_should_stop(threadID))
sp->bestValue = value; {
if(sp->bestValue >= sp->beta) { sp->bestValue = value;
sp_update_pv(sp->parentSstack, ss, sp->ply); if (sp->bestValue >= sp->beta)
for(int i = 0; i < ActiveThreads; i++) {
if(i != threadID && (i == sp->master || sp->slaves[i])) sp_update_pv(sp->parentSstack, ss, sp->ply);
Threads[i].stop = true; for (int i = 0; i < ActiveThreads; i++)
sp->finished = true; if (i != threadID && (i == sp->master || sp->slaves[i]))
Threads[i].stop = true;
sp->finished = true;
} }
} }
lock_release(&(sp->lock)); lock_release(&(sp->lock));
@ -1500,10 +1515,10 @@ namespace {
// If this is the master thread and we have been asked to stop because of // If this is the master thread and we have been asked to stop because of
// a beta cutoff higher up in the tree, stop all slave threads: // a beta cutoff higher up in the tree, stop all slave threads:
if(sp->master == threadID && thread_should_stop(threadID)) if (sp->master == threadID && thread_should_stop(threadID))
for(int i = 0; i < ActiveThreads; i++) for(int i = 0; i < ActiveThreads; i++)
if(sp->slaves[i]) if(sp->slaves[i])
Threads[i].stop = true; Threads[i].stop = true;
sp->cpus--; sp->cpus--;
sp->slaves[threadID] = 0; sp->slaves[threadID] = 0;