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Micro-optimize SEE

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Results for 10 tests for each version (gcc 4.8.3 on mingw):

            Base      Test      Diff
    Mean    1502447   1507917   -5470
    StDev   3119      1364      4153

p-value: 0,906
speedup: 0,004

Results for 10 tests for each version (MSVC 2013):

            Base      Test      Diff
    Mean    1400899   1403713   -2814
    StDev   1273      2804      2700

p-value: 0,851
speedup: 0,002

No functional change.
This commit is contained in:
Marco Costalba 2015-02-07 12:07:43 +01:00
parent 8b0fee9998
commit 47a0768102
1 changed files with 1 additions and 11 deletions
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12
src/position.cpp
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@ -1098,21 +1098,11 @@ Value Position::see(Move m) const {
// Locate and remove the next least valuable attacker // Locate and remove the next least valuable attacker
captured = min_attacker<PAWN>(byTypeBB, to, stmAttackers, occupied, attackers); captured = min_attacker<PAWN>(byTypeBB, to, stmAttackers, occupied, attackers);
// Stop before processing a king capture
if (captured == KING)
{
if (stmAttackers == attackers)
++slIndex;
break;
}
stm = ~stm; stm = ~stm;
stmAttackers = attackers & pieces(stm); stmAttackers = attackers & pieces(stm);
++slIndex; ++slIndex;
} while (stmAttackers); } while (stmAttackers && (captured != KING || (--slIndex, false))); // Stop before a king capture
// Having built the swap list, we negamax through it to find the best // Having built the swap list, we negamax through it to find the best
// achievable score from the point of view of the side to move. // achievable score from the point of view of the side to move.