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Remove Redundant Branchless Execution

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Passed STC non-reg:
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 102272 W: 26553 L: 26411 D: 49308
Ptnml(0-2): 269, 11212, 28036, 11346, 273
https://tests.stockfishchess.org/tests/view/69d0f1c5e2b443cb2670b710

closes https://github.com/official-stockfish/Stockfish/pull/6707

No functional change
This commit is contained in:
FauziAkram
2026-04-09 21:56:05 +02:00
committed by Disservin
parent d3a4587fe8
commit 5ae13d2bd4
1 changed files with 7 additions and 8 deletions
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src/search.cpp
+7 -8
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@@ -115,14 +115,13 @@ void update_correction_history(const Position& pos,
shared.nonpawn_correction_entry<WHITE>(pos).at(us).nonPawnWhite << bonus * nonPawnWeight / 128;
shared.nonpawn_correction_entry<BLACK>(pos).at(us).nonPawnBlack << bonus * nonPawnWeight / 128;
// Branchless: use mask to zero bonus when move is not ok
const int mask = int(m.is_ok());
const Square to = m.to_sq_unchecked();
const Piece pc = pos.piece_on(to);
const int bonus2 = (bonus * 126 / 128) * mask;
const int bonus4 = (bonus * 63 / 128) * mask;
(*(ss - 2)->continuationCorrectionHistory)[pc][to] << bonus2;
(*(ss - 4)->continuationCorrectionHistory)[pc][to] << bonus4;
if (m.is_ok())
{
const Square to = m.to_sq();
const Piece pc = pos.piece_on(to);
(*(ss - 2)->continuationCorrectionHistory)[pc][to] << bonus * 126 / 128;
(*(ss - 4)->continuationCorrectionHistory)[pc][to] << bonus * 63 / 128;
}
}
// Add a small random component to draw evaluations to avoid 3-fold blindness