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Fix a logic bug in TranspositionTable::store()

Browse source 
Make the logic work as advertised in the function
description.

Still a fallback from TT cleanup.

This should be less serious then the one in retrieve(),
but it's still a bug.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2008-11-10 15:15:40 +01:00
parent cdf1f23bc5
commit 34b1d0538b
1 changed files with 6 additions and 4 deletions
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10
src/tt.cpp
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@ -124,12 +124,14 @@ void TranspositionTable::store(const Position &pos, Value v, Depth d,
*(tte+i) = TTEntry(pos.get_key(), v, type, d, m, generation);
return;
}
if ( i == 0 // already is (replace == tte+i), common case
|| replace->generation() < (tte+i)->generation())
if (i == 0) // replace would be a no-op in this common case
continue;
if ( replace->generation() > (tte+i)->generation()
|| (tte+i)->depth() < replace->depth())
int c1 = (replace->generation() == generation ? 2 : 0);
int c2 = ((tte+i)->generation() == generation ? -2 : 0);
int c3 = ((tte+i)->depth() < replace->depth() ? 1 : 0);
if (c1 + c2 + c3 > 0)
replace = tte+i;
}
*replace = TTEntry(pos.get_key(), v, type, d, m, generation);