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Retire pv[] from SearchStack

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Extract PV info from TT instead of using
a set of arrays. This is almost equivalent
except for cases when TT is full and the PV entry
is overwritten, but this is very rare.

(Almost) No functional change

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2010-06-26 15:05:38 +01:00
parent 0a687b2cf0
commit adb43cc0cc
3 changed files with 38 additions and 51 deletions
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6
src/tt.cpp
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@@ -192,9 +192,9 @@ void TranspositionTable::extract_pv(const Position& pos, Move pv[], const int PL
Position p(pos, pos.thread());
int ply = 0;
// Update position to the end of current PV
while (pv[ply] != MOVE_NONE)
p.do_move(pv[ply++], st);
assert(pv[0] != MOVE_NONE);
p.do_move(pv[ply++], st);
// Try to add moves from TT while possible
while ( (tte = retrieve(p.get_key())) != NULL