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Small code reformat in TranspositionTable::extract_pv()

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In particular don't use an array of StateInfo, this
avoids a possible overflow and is in any case redundant.

Also pass as argument the pv[] array size to avoid a second
possible overflow on this one.

Fix suggested by Joona.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2009-10-05 12:00:35 +01:00
parent 32dfaa56b0
commit 60bc30275d
3 changed files with 18 additions and 19 deletions
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33
src/tt.cpp
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@@ -220,27 +220,26 @@ void TranspositionTable::insert_pv(const Position& pos, Move pv[]) {
/// will often get single-move PVs when the search stops while failing high,
/// and a single-move PV means that we don't have a ponder move.
void TranspositionTable::extract_pv(const Position& pos, Move pv[]) {
void TranspositionTable::extract_pv(const Position& pos, Move pv[], int pvSize) {
int ply;
Position p(pos);
StateInfo st[100];
for (ply = 0; pv[ply] != MOVE_NONE; ply++)
p.do_move(pv[ply], st[ply]);
bool stop;
const TTEntry* tte;
for (stop = false, tte = retrieve(p.get_key());
tte && tte->move() != MOVE_NONE && !stop;
tte = retrieve(p.get_key()), ply++)
StateInfo st;
Position p(pos);
int ply = 0;
// Update position to the end of current PV
while (pv[ply] != MOVE_NONE)
p.do_move(pv[ply++], st);
// Try to add moves from TT until possible
while ( (tte = retrieve(p.get_key())) != NULL
&& tte->move() != MOVE_NONE
&& move_is_legal(p, tte->move())
&& (!p.is_draw() || ply < 2)
&& ply < pvSize)
{
if (!move_is_legal(p, tte->move()))
break;
pv[ply] = tte->move();
p.do_move(pv[ply], st[ply]);
for (int j = 0; j < ply; j++)
if (st[j].key == p.get_key()) stop = true;
p.do_move(pv[ply++], st);
}
pv[ply] = MOVE_NONE;
}