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Refactor king ring calculation

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Compute the "double protection by pawns" expression only once
in initialize(), instead of once for each piece in the piece loop.

Passed STC
http://tests.stockfishchess.org/tests/view/5c1506380ebc5902ba11f3b4
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 9494 W: 2191 L: 2045 D: 5258

Inspired by Nick Pelling's test
   http://tests.stockfishchess.org/tests/view/5c144d110ebc5902ba11e4af
and an older test of mine
   http://tests.stockfishchess.org/tests/view/5c0402810ebc5902bcee1fc8

Non functional change.
This commit is contained in:
Alain SAVARD
2018-12-15 12:09:35 -05:00
committed by Stéphane Nicolet
parent 4e2bb8fa44
commit 64a6138d37
1 changed files with 2 additions and 1 deletions
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3
src/evaluate.cpp
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@@ -274,6 +274,7 @@ namespace {
kingRing[Us] |= shift<EAST>(kingRing[Us]);
kingAttackersCount[Them] = popcount(kingRing[Us] & pe->pawn_attacks(Them));
kingRing[Us] &= ~double_pawn_attacks_bb<Us>(pos.pieces(Us, PAWN));
kingAttacksCount[Them] = kingAttackersWeight[Them] = 0;
}
}
@@ -309,7 +310,7 @@ namespace {
attackedBy[Us][Pt] |= b;
attackedBy[Us][ALL_PIECES] |= b;
if (b & kingRing[Them] & ~double_pawn_attacks_bb<Them>(pos.pieces(Them, PAWN)))
if (b & kingRing[Them])
{
kingAttackersCount[Us]++;
kingAttackersWeight[Us] += KingAttackWeights[Pt];