HCha/Stockfish
1
0
Fork 0
mirror of https://github.com/HChaZZY/Stockfish.git synced 2025-12-21 17:46:26 +08:00
Code Issues Packages Projects Releases Wiki Activity

Speed-up generate<LEGAL>

Browse Source 
The trick here is to check for legality only in the
(rare) cases we have pinned pieces or a king move
or an en-passant.

This trick is able to increase the speed of perft
of more then 20%!

No functional change.
This commit is contained in:
Marco Costalba
2012-09-11 20:00:58 +02:00
parent 1598a3edf8
commit e0bd0f250b
1 changed files with 3 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
src/movegen.cpp
View File

@@ -420,11 +420,13 @@ MoveStack* generate<LEGAL>(const Position& pos, MoveStack* mlist) {
MoveStack *end, *cur = mlist; MoveStack *end, *cur = mlist;
Bitboard pinned = pos.pinned_pieces(); Bitboard pinned = pos.pinned_pieces();
Square ksq = pos.king_square(pos.side_to_move());
end = pos.in_check() ? generate<EVASIONS>(pos, mlist) end = pos.in_check() ? generate<EVASIONS>(pos, mlist)
: generate<NON_EVASIONS>(pos, mlist); : generate<NON_EVASIONS>(pos, mlist);
while (cur != end) while (cur != end)
if (!pos.pl_move_is_legal(cur->move, pinned)) if ( (pinned || from_sq(cur->move) == ksq || type_of(cur->move) == ENPASSANT)
&& !pos.pl_move_is_legal(cur->move, pinned))
cur->move = (--end)->move; cur->move = (--end)->move;
else else
cur++; cur++;