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Code Issues Releases Wiki Activity

generate_evasions() avoid to calculate pinned pieces

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Pass as function argument.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2009-02-11 12:13:58 +01:00
parent 56f607fe0f
commit 67535711e8
3 changed files with 7 additions and 9 deletions
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12
src/movegen.cpp
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@ -204,7 +204,7 @@ int generate_checks(const Position& pos, MoveStack* mlist, Bitboard dc) {
/// only legal moves. It returns the number of generated moves. This
/// function is very ugly, and needs cleaning up some time later. FIXME
int generate_evasions(const Position& pos, MoveStack* mlist) {
int generate_evasions(const Position& pos, MoveStack* mlist, Bitboard pinned) {
assert(pos.is_ok());
assert(pos.is_check());
@ -265,12 +265,10 @@ int generate_evasions(const Position& pos, MoveStack* mlist) {
if (!(checkers & (checkers - 1))) // Only one bit set?
{
Square checksq = first_1(checkers);
Bitboard not_pinned = ~pinned;
assert(pos.color_of_piece_on(checksq) == them);
// Find pinned pieces
Bitboard not_pinned = ~pos.pinned_pieces(us);
// Generate captures of the checking piece
// Pawn captures
@ -361,15 +359,15 @@ int generate_legal_moves(const Position& pos, MoveStack* mlist) {
assert(pos.is_ok());
Bitboard pinned = pos.pinned_pieces(pos.side_to_move());
if (pos.is_check())
return generate_evasions(pos, mlist);
return generate_evasions(pos, mlist, pinned);
// Generate pseudo-legal moves
int n = generate_captures(pos, mlist);
n += generate_noncaptures(pos, mlist + n);
Bitboard pinned = pos.pinned_pieces(pos.side_to_move());
// Remove illegal moves from the list
for (int i = 0; i < n; i++)
if (!pos.pl_move_is_legal(mlist[i].move, pinned))

2
src/movegen.h
View file

@ -35,7 +35,7 @@
extern int generate_captures(const Position &pos, MoveStack *mlist);
extern int generate_noncaptures(const Position &pos, MoveStack *mlist);
extern int generate_checks(const Position &pos, MoveStack *mlist, Bitboard dc);
extern int generate_evasions(const Position &pos, MoveStack *mlist);
extern int generate_evasions(const Position &pos, MoveStack *mlist, Bitboard pinned);
extern int generate_legal_moves(const Position &pos, MoveStack *mlist);
extern bool move_is_legal(const Position &pos, const Move m, Bitboard pinned);

2
src/movepick.cpp
View file

@ -162,7 +162,7 @@ Move MovePicker::get_next_move() {
case PH_EVASIONS:
assert(pos.is_check());
numOfMoves = generate_evasions(pos, moves);
numOfMoves = generate_evasions(pos, moves, pinned);
score_evasions();
movesPicked = 0;
break;