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Do not copy master position in split()

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A pointer is enough because after a split point has been
setup master and slaves thread end up calling sp_search() or
sp_search_pv() and here a full copy of split point position is
done again, note that even master does another copy (of itself)
and this is done before any do_move() call so that master Position
is never updated between split() and sp_search().

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2010-01-25 12:44:30 +01:00
parent c2df60048e
commit 0ff91e16da
4 changed files with 8 additions and 13 deletions
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src/search.cpp
+4 -9
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@@ -1813,8 +1813,7 @@ namespace {
assert(threadID >= 0 && threadID < ActiveThreads);
assert(ActiveThreads > 1);
Position pos;
pos.fast_copy(sp->pos);
Position pos(*sp->pos);
CheckInfo ci(pos);
SearchStack* ss = sp->sstack[threadID];
Value value = -VALUE_INFINITE;
@@ -1956,8 +1955,7 @@ namespace {
assert(threadID >= 0 && threadID < ActiveThreads);
assert(ActiveThreads > 1);
Position pos;
pos.fast_copy(sp->pos);
Position pos(*sp->pos);
CheckInfo ci(pos);
SearchStack* ss = sp->sstack[threadID];
Value value = -VALUE_INFINITE;
@@ -2969,7 +2967,7 @@ namespace {
splitPoint = SplitPointStack[master] + Threads[master].activeSplitPoints;
Threads[master].activeSplitPoints++;
// Initialize the split point object and copy current position
// Initialize the split point object
splitPoint->parent = Threads[master].splitPoint;
splitPoint->finished = false;
splitPoint->ply = ply;
@@ -2983,14 +2981,11 @@ namespace {
splitPoint->mp = mp;
splitPoint->moves = *moves;
splitPoint->cpus = 1;
splitPoint->pos.fast_copy(p);
splitPoint->pos = &p;
splitPoint->parentSstack = sstck;
for (i = 0; i < ActiveThreads; i++)
splitPoint->slaves[i] = 0;
// Detach splitPoint Position from the master one
splitPoint->pos.detach();
// Copy the tail of current search stack to the master thread
memcpy(splitPoint->sstack[master] + ply - 1, sstck + ply - 1, 3 * sizeof(SearchStack));
Threads[master].splitPoint = splitPoint;