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Code Issues Releases Wiki Activity

Avoid research in case thread has already been asked to stop

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Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Joona Kiiski 2010-02-24 12:02:39 +02:00 • committed by Marco Costalba
parent 5c944fb3b4
commit 8a78ac84f3
1 changed files with 4 additions and 6 deletions
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8
src/search.cpp
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@ -1835,7 +1835,7 @@ namespace {
if (ss[sp->ply].reduction) if (ss[sp->ply].reduction)
{ {
value = -search(pos, ss, -(sp->beta-1), newDepth-ss[sp->ply].reduction, sp->ply+1, true, threadID); value = -search(pos, ss, -(sp->beta-1), newDepth-ss[sp->ply].reduction, sp->ply+1, true, threadID);
doFullDepthSearch = (value >= sp->beta); doFullDepthSearch = (value >= sp->beta && !TM.thread_should_stop(threadID));
} }
} }
@ -1932,7 +1932,7 @@ namespace {
{ {
Value localAlpha = sp->alpha; Value localAlpha = sp->alpha;
value = -search(pos, ss, -localAlpha, newDepth-ss[sp->ply].reduction, sp->ply+1, true, threadID); value = -search(pos, ss, -localAlpha, newDepth-ss[sp->ply].reduction, sp->ply+1, true, threadID);
doFullDepthSearch = (value > localAlpha); doFullDepthSearch = (value > localAlpha && !TM.thread_should_stop(threadID));
} }
} }
@ -1942,15 +1942,13 @@ namespace {
ss[sp->ply].reduction = Depth(0); ss[sp->ply].reduction = Depth(0);
value = -search(pos, ss, -localAlpha, newDepth, sp->ply+1, true, threadID); value = -search(pos, ss, -localAlpha, newDepth, sp->ply+1, true, threadID);
if (value > localAlpha && value < sp->beta) if (value > localAlpha && value < sp->beta && !TM.thread_should_stop(threadID))
{ {
// If another thread has failed high then sp->alpha has been increased // If another thread has failed high then sp->alpha has been increased
// to be higher or equal then beta, if so, avoid to start a PV search. // to be higher or equal then beta, if so, avoid to start a PV search.
localAlpha = sp->alpha; localAlpha = sp->alpha;
if (localAlpha < sp->beta) if (localAlpha < sp->beta)
value = -search_pv(pos, ss, -sp->beta, -localAlpha, newDepth, sp->ply+1, threadID); value = -search_pv(pos, ss, -sp->beta, -localAlpha, newDepth, sp->ply+1, threadID);
else
assert(TM.thread_should_stop(threadID));
} }
} }
pos.undo_move(move); pos.undo_move(move);