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Remove prefetching in Position::do_null_move

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Passed non-regression STC, Hash=16:

LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 60704 W: 15709 L: 15522 D: 29473
Ptnml(0-2): 169, 6589, 16649, 6776, 169
https://tests.stockfishchess.org/tests/view/6963d381f6d2e8deff76918f

Passed non-regression STC SMP, Hash=512:

LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 313512 W: 80151 L: 80231 D: 153130
Ptnml(0-2): 376, 35492, 85111, 35390, 387
https://tests.stockfishchess.org/tests/view/696e1684e5a70879bd3fe38f

closes https://github.com/official-stockfish/Stockfish/pull/6545

No functional change
This commit is contained in:
Jakub Ciolek
2026-02-08 15:22:06 +01:00
committed by Disservin
parent e3a5c40f05
commit 73475b198d
3 changed files with 3 additions and 4 deletions
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src/position.cpp
+1 -2
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@@ -1211,7 +1211,7 @@ void Position::do_castling(Color us,
// Used to do a "null move": it flips
// the side to move without executing any move on the board.
void Position::do_null_move(StateInfo& newSt, const TranspositionTable& tt) {
void Position::do_null_move(StateInfo& newSt) {
assert(!checkers());
assert(&newSt != st);
@@ -1228,7 +1228,6 @@ void Position::do_null_move(StateInfo& newSt, const TranspositionTable& tt) {
}
st->key ^= Zobrist::side;
prefetch(tt.first_entry(key()));
st->pliesFromNull = 0;