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Factor out pawn attacks in 'lever'

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Improves readibility and possibly speed.

No functional change.
This commit is contained in:
Marco Costalba
2014-06-14 12:16:22 +02:00
parent 84dabe5982
commit 3c1201c20c
1 changed files with 5 additions and 5 deletions
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10
src/pawns.cpp
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@@ -93,7 +93,6 @@ namespace {
const Square Up = (Us == WHITE ? DELTA_N : DELTA_S); const Square Up = (Us == WHITE ? DELTA_N : DELTA_S);
const Square Right = (Us == WHITE ? DELTA_NE : DELTA_SW); const Square Right = (Us == WHITE ? DELTA_NE : DELTA_SW);
const Square Left = (Us == WHITE ? DELTA_NW : DELTA_SE); const Square Left = (Us == WHITE ? DELTA_NW : DELTA_SE);
const Piece pc = make_piece(Us, PAWN);
Bitboard b, p, doubled; Bitboard b, p, doubled;
Square s; Square s;
@@ -101,6 +100,7 @@ namespace {
bool passed, isolated, opposed, connected, backward, candidate, unsupported, lever; bool passed, isolated, opposed, connected, backward, candidate, unsupported, lever;
Score value = SCORE_ZERO; Score value = SCORE_ZERO;
const Square* pl = pos.list<PAWN>(Us); const Square* pl = pos.list<PAWN>(Us);
const Bitboard* pawnAttacksBB = StepAttacksBB[make_piece(Us, PAWN)];
Bitboard ourPawns = pos.pieces(Us, PAWN); Bitboard ourPawns = pos.pieces(Us, PAWN);
Bitboard theirPawns = pos.pieces(Them, PAWN); Bitboard theirPawns = pos.pieces(Them, PAWN);
@@ -136,7 +136,7 @@ namespace {
doubled = ourPawns & forward_bb(Us, s); doubled = ourPawns & forward_bb(Us, s);
opposed = theirPawns & forward_bb(Us, s); opposed = theirPawns & forward_bb(Us, s);
passed = !(theirPawns & passed_pawn_mask(Us, s)); passed = !(theirPawns & passed_pawn_mask(Us, s));
lever = theirPawns & StepAttacksBB[pc][s]; lever = theirPawns & pawnAttacksBB[s];
// Test for backward pawn. // Test for backward pawn.
// If the pawn is passed, isolated, or connected it cannot be // If the pawn is passed, isolated, or connected it cannot be
@@ -192,6 +192,9 @@ namespace {
if (connected) if (connected)
value += Connected[f][relative_rank(Us, s)]; value += Connected[f][relative_rank(Us, s)];
if (lever)
value += Lever[relative_rank(Us, s)];
if (candidate) if (candidate)
{ {
value += CandidatePassed[relative_rank(Us, s)]; value += CandidatePassed[relative_rank(Us, s)];
@@ -199,9 +202,6 @@ namespace {
if (!doubled) if (!doubled)
e->candidatePawns[Us] |= s; e->candidatePawns[Us] |= s;
} }
if (lever)
value += Lever[relative_rank(Us, s)];
} }
// In endgame it's better to have pawns on both wings. So give a bonus according // In endgame it's better to have pawns on both wings. So give a bonus according