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TranspositionTable: add first_entry() helper

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An inline function to retrieve the first TT entry
given a position.

Plus usual whitespace noise.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2008-09-06 12:30:07 +02:00
parent 61f41a057d
commit c2c0ba875f
4 changed files with 46 additions and 42 deletions
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46
src/tt.cpp
View file

@ -105,7 +105,7 @@ void TranspositionTable::store(const Position &pos, Value v, Depth d,
Move m, ValueType type) {
TTEntry *tte, *replace;
tte = replace = entries + int(pos.get_key() & (size - 1)) * 4;
tte = replace = first_entry(pos);
for (int i = 0; i < 4; i++)
{
if (!(tte+i)->key()) // still empty
@ -143,28 +143,33 @@ void TranspositionTable::store(const Position &pos, Value v, Depth d,
bool TranspositionTable::retrieve(const Position &pos, Value *value,
Depth *d, Move *move,
ValueType *type) const {
TTEntry *tte;
bool found = false;
TTEntry *tte = first_entry(pos);
tte = entries + int(pos.get_key() & (size - 1)) * 4;
for (int i = 0; i < 4 && !found ; i++)
if ((tte+i)->key() == pos.get_key())
for (int i = 0; i < 4; i++)
{
tte += i;
if (tte->key() == pos.get_key())
{
tte = tte + i;
found = true;
*value = tte->value();
*type = tte->type();
*d = tte->depth();
*move = tte->move();
return true;
}
if (!found) {
*move = MOVE_NONE;
return false;
}
*value = tte->value();
*type = tte->type();
*d = tte->depth();
*move = tte->move();
return true;
*move = MOVE_NONE;
return false;
}
/// TranspositionTable::first_entry returns a pointer to the first
/// entry of a cluster given a position.
inline TTEntry* TranspositionTable::first_entry(const Position &pos) const {
return entries + (int(pos.get_key() & (size - 1)) << 2);
}
/// TranspositionTable::new_search() is called at the beginning of every new
/// search. It increments the "generation" variable, which is used to
/// distinguish transposition table entries from previous searches from
@ -212,12 +217,9 @@ TTEntry::TTEntry() {
}
TTEntry::TTEntry(Key k, Value v, ValueType t, Depth d, Move m,
int generation) {
key_ = k;
data = (m & 0x7FFFF) | (t << 20) | (generation << 23);
value_ = v;
depth_ = int16_t(d);
}
int generation) :
key_ (k), data((m & 0x7FFFF) | (t << 20) | (generation << 23)),
value_(v), depth_(int16_t(d)) {}
/// Functions for extracting data from TTEntry objects.

2
src/tt.h
View file

@ -74,6 +74,8 @@ public:
int full();
private:
TTEntry* first_entry(const Position &pos) const;
unsigned size;
int writes;
TTEntry* entries;