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Introduce and use TranspositionTable::refresh()

Browse source 
No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2010-10-30 15:22:10 +01:00
parent ff95bbd41f
commit c416133e2f
2 changed files with 15 additions and 9 deletions
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13
src/search.cpp
View file

@ -1001,10 +1001,8 @@ namespace {
}
// 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
@ -1021,7 +1019,7 @@ namespace {
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:
@ -1030,12 +1028,9 @@ namespace {
// * 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);
}

11
src/tt.h
View file

@ -64,6 +64,7 @@ public:
staticValue = int16_t(statV);
staticValueMargin = int16_t(kd);
}
void set_generation(int g) { data = move() | (type() << 21) | (g << 23); }
uint32_t key() const { return key32; }
Depth depth() const { return Depth(depth16); }
@ -114,6 +115,7 @@ public:
TTEntry* retrieve(const Key posKey) const;
void new_search();
TTEntry* first_entry(const Key posKey) const;
void refresh(const TTEntry* tte) const;
private:
size_t size;
@ -133,4 +135,13 @@ inline TTEntry* TranspositionTable::first_entry(const Key posKey) const {
return entries[uint32_t(posKey) & (size - 1)].data;
}
/// TranspositionTable::refresh updates the 'generation' value of the TTEntry
/// to avoid aging. Normally called after a TT hit, before to return.
inline void TranspositionTable::refresh(const TTEntry* tte) const {
const_cast<TTEntry*>(tte)->set_generation(generation);
}
#endif // !defined(TT_H_INCLUDED)