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Split transposition table lookup in a separate function

Browse Source 
This slims down the code and is a prerequisite for
future patches.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2008-09-06 15:53:43 +02:00
parent c2c0ba875f
commit a230dc1404
3 changed files with 39 additions and 72 deletions
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45
src/tt.cpp
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@@ -136,29 +136,20 @@ void TranspositionTable::store(const Position &pos, Value v, Depth d,
/// TranspositionTable::retrieve looks up the current position in the
/// transposition table, and extracts the value, value type, depth and
/// best move if the position is found. The return value is true if
/// the position is found, and false if it isn't.
/// transposition table. Returns a pointer to the TTEntry or NULL
/// if position is not found.
const TTEntry* TranspositionTable::retrieve(const Position &pos) const {
bool TranspositionTable::retrieve(const Position &pos, Value *value,
Depth *d, Move *move,
ValueType *type) const {
TTEntry *tte = first_entry(pos);
for (int i = 0; i < 4; i++)
{
tte += i;
if (tte->key() == pos.get_key())
{
*value = tte->value();
*type = tte->type();
*d = tte->depth();
*move = tte->move();
return true;
}
return tte;
}
*move = MOVE_NONE;
return false;
return NULL;
}
@@ -222,28 +213,4 @@ TTEntry::TTEntry(Key k, Value v, ValueType t, Depth d, Move m,
value_(v), depth_(int16_t(d)) {}
/// Functions for extracting data from TTEntry objects.
inline Key TTEntry::key() const {
return key_;
}
inline Depth TTEntry::depth() const {
return Depth(depth_);
}
inline Move TTEntry::move() const {
return Move(data & 0x7FFFF);
}
inline Value TTEntry::value() const {
return Value(value_);
}
inline ValueType TTEntry::type() const {
return ValueType((data >> 20) & 3);
}
inline int TTEntry::generation() const {
return (data >> 23);
}