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Microptimize generation of pawn evasions

Browse source 
Skip calling promotion generation functions in
the very common case of no possible promotion
evasion. Also retire generate_pawn_captures()

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2012-01-17 21:31:49 +01:00
parent b6b8c62ba5
commit 972dec454c
1 changed files with 8 additions and 14 deletions
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22
src/movegen.cpp
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@ -100,15 +100,6 @@ namespace {
} }
template<Square Delta>
inline MoveStack* generate_pawn_captures(MoveStack* mlist, Bitboard pawns, Bitboard target) {
Bitboard b = move_pawns<Delta>(pawns) & target;
SERIALIZE_PAWNS(b, -Delta);
return mlist;
}
template<MoveType Type, Square Delta> template<MoveType Type, Square Delta>
inline MoveStack* generate_promotions(MoveStack* mlist, Bitboard pawnsOn7, Bitboard target, Square ksq) { inline MoveStack* generate_promotions(MoveStack* mlist, Bitboard pawnsOn7, Bitboard target, Square ksq) {
@ -146,6 +137,7 @@ namespace {
// Calculate our parametrized parameters at compile time, named according to // Calculate our parametrized parameters at compile time, named according to
// the point of view of white side. // the point of view of white side.
const Color Them = (Us == WHITE ? BLACK : WHITE); const Color Them = (Us == WHITE ? BLACK : WHITE);
const Bitboard TRank8BB = (Us == WHITE ? Rank8BB : Rank1BB);
const Bitboard TRank7BB = (Us == WHITE ? Rank7BB : Rank2BB); const Bitboard TRank7BB = (Us == WHITE ? Rank7BB : Rank2BB);
const Bitboard TRank3BB = (Us == WHITE ? Rank3BB : Rank6BB); const Bitboard TRank3BB = (Us == WHITE ? Rank3BB : Rank6BB);
const Square UP = (Us == WHITE ? DELTA_N : DELTA_S); const Square UP = (Us == WHITE ? DELTA_N : DELTA_S);
@ -176,7 +168,6 @@ namespace {
if (Type == MV_NON_CAPTURE_CHECK) if (Type == MV_NON_CAPTURE_CHECK)
{ {
// Consider only direct checks
b1 &= pos.attacks_from<PAWN>(ksq, Them); b1 &= pos.attacks_from<PAWN>(ksq, Them);
b2 &= pos.attacks_from<PAWN>(ksq, Them); b2 &= pos.attacks_from<PAWN>(ksq, Them);
@ -199,7 +190,7 @@ namespace {
} }
// Promotions and underpromotions // Promotions and underpromotions
if (pawnsOn7) if (pawnsOn7 && (Type != MV_EVASION || (target & TRank8BB)))
{ {
if (Type == MV_CAPTURE) if (Type == MV_CAPTURE)
emptySquares = pos.empty_squares(); emptySquares = pos.empty_squares();
@ -215,12 +206,15 @@ namespace {
// Standard and en-passant captures // Standard and en-passant captures
if (Type == MV_CAPTURE || Type == MV_EVASION || Type == MV_NON_EVASION) if (Type == MV_CAPTURE || Type == MV_EVASION || Type == MV_NON_EVASION)
{ {
mlist = generate_pawn_captures<RIGHT>(mlist, pawnsNotOn7, enemies); b1 = move_pawns<RIGHT>(pawnsNotOn7) & enemies;
mlist = generate_pawn_captures<LEFT >(mlist, pawnsNotOn7, enemies); b2 = move_pawns<LEFT >(pawnsNotOn7) & enemies;
SERIALIZE_PAWNS(b1, -RIGHT);
SERIALIZE_PAWNS(b2, -LEFT);
if (pos.ep_square() != SQ_NONE) if (pos.ep_square() != SQ_NONE)
{ {
assert(rank_of(pos.ep_square()) == (Us == WHITE ? RANK_6 : RANK_3)); assert(rank_of(pos.ep_square()) == relative_rank(Us, RANK_6));
// An en passant capture can be an evasion only if the checking piece // An en passant capture can be an evasion only if the checking piece
// is the double pushed pawn and so is in the target. Otherwise this // is the double pushed pawn and so is in the target. Otherwise this