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TranspositionTable: micro optimize first cycle

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In the common case (>95%) tte == replace so skip
additional comparisons in this case.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2008-09-06 12:21:08 +02:00
parent 392360e73b
commit d786822b92
1 changed files with 7 additions and 7 deletions
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14
src/tt.cpp
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@@ -114,7 +114,7 @@ void TranspositionTable::store(const Position &pos, Value v, Depth d,
writes++;
return;
}
if ((tte+i)->key() == pos.get_key())
if ((tte+i)->key() == pos.get_key()) // overwrite old
{
if (m == MOVE_NONE)
m = (tte+i)->move();
@@ -122,12 +122,12 @@ void TranspositionTable::store(const Position &pos, Value v, Depth d,
*(tte+i) = TTEntry(pos.get_key(), v, type, d, m, generation);
return;
}
if (replace->generation() == generation)
{
if ((tte+i)->generation() != generation || (tte+i)->depth() < replace->depth())
replace = tte+i;
}
else if ((tte+i)->generation() != generation && (tte+i)->depth() < replace->depth())
if ( i == 0 // already is (replace == tte+i), common case
|| replace->generation() < (tte+i)->generation())
continue;
if ( replace->generation() > (tte+i)->generation()
|| (tte+i)->depth() < replace->depth())
replace = tte+i;
}
*replace = TTEntry(pos.get_key(), v, type, d, m, generation);