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Code Issues Releases Wiki Activity

Remove unnecessary assignments related to adjusted static evaluation

Browse source 
In both search and qsearch, there are instances
where we do unadjustedStaticEval = ss->staticEval
= eval/bestValue = tte->eval(), but immediately
after re-assign ss-static and eval/bestValue to
some new value, which makes the initial assignment
redundant.

closes https://github.com/official-stockfish/Stockfish/pull/5045

No functional change
This commit is contained in:
GoldenRare 2024-02-06 05:45:52 -05:00 • committed by Disservin
parent 21dff6c276
commit 3d5b16df7c
1 changed files with 11 additions and 11 deletions
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22
src/search.cpp
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@ -701,9 +701,9 @@ Value Search::Worker::search(
else if (ss->ttHit)
{
// Never assume anything about values stored in TT
unadjustedStaticEval = ss->staticEval = eval = tte->eval();
if (eval == VALUE_NONE)
unadjustedStaticEval = ss->staticEval = eval = evaluate(pos, thisThread->optimism[us]);
unadjustedStaticEval = tte->eval();
if (unadjustedStaticEval == VALUE_NONE)
unadjustedStaticEval = evaluate(pos, thisThread->optimism[us]);
else if (PvNode)
Eval::NNUE::hint_common_parent_position(pos);
@ -715,7 +715,7 @@ Value Search::Worker::search(
}
else
{
unadjustedStaticEval = ss->staticEval = eval = evaluate(pos, thisThread->optimism[us]);
unadjustedStaticEval = evaluate(pos, thisThread->optimism[us]);
ss->staticEval = eval = to_corrected_static_eval(unadjustedStaticEval, *thisThread, pos);
// Static evaluation is saved as it was before adjustment by correction history
@ -1434,9 +1434,9 @@ Value Search::Worker::qsearch(Position& pos, Stack* ss, Value alpha, Value beta,
if (ss->ttHit)
{
// Never assume anything about values stored in TT
if ((unadjustedStaticEval = ss->staticEval = bestValue = tte->eval()) == VALUE_NONE)
unadjustedStaticEval = ss->staticEval = bestValue =
evaluate(pos, thisThread->optimism[us]);
unadjustedStaticEval = tte->eval();
if (unadjustedStaticEval == VALUE_NONE)
unadjustedStaticEval = evaluate(pos, thisThread->optimism[us]);
ss->staticEval = bestValue =
to_corrected_static_eval(unadjustedStaticEval, *thisThread, pos);
@ -1448,10 +1448,10 @@ Value Search::Worker::qsearch(Position& pos, Stack* ss, Value alpha, Value beta,
else
{
// In case of null move search, use previous static eval with a different sign
unadjustedStaticEval = ss->staticEval = bestValue =
(ss - 1)->currentMove != Move::null() ? evaluate(pos, thisThread->optimism[us])
: -(ss - 1)->staticEval;
ss->staticEval = bestValue =
unadjustedStaticEval = (ss - 1)->currentMove != Move::null()
? evaluate(pos, thisThread->optimism[us])
: -(ss - 1)->staticEval;
ss->staticEval = bestValue =
to_corrected_static_eval(unadjustedStaticEval, *thisThread, pos);
}