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Optimize accumulators for null move.

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This commit is contained in:
noobpwnftw
2020-09-27 02:28:28 +08:00
committed by nodchip
parent 96a3180770
commit 9d4bf4fe0c
1 changed files with 6 additions and 7 deletions
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13
src/position.cpp
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@@ -999,21 +999,20 @@ void Position::do_null_move(StateInfo& newSt) {
assert(!checkers());
assert(&newSt != st);
if (Eval::useNNUE != Eval::UseNNUEMode::False)
{
std::memcpy(&newSt, st, sizeof(StateInfo));
}
else
std::memcpy(&newSt, st, offsetof(StateInfo, accumulator));
std::memcpy(&newSt, st, offsetof(StateInfo, accumulator));
newSt.previous = st;
st = &newSt;
// Used by NNUE
st->accumulator.computed_accumulation = false;
auto& dp = st->dirtyPiece;
dp.dirty_num = 0;
if (st->epSquare != SQ_NONE)
{
st->key ^= Zobrist::enpassant[file_of(st->epSquare)];
st->epSquare = SQ_NONE;
st->accumulator.computed_accumulation = false;
}
st->key ^= Zobrist::side;