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Add a MovePicker c'tor specialized for qsearch

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This simple patch shows a speed increase of
more then 2% !

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2011-01-23 22:59:05 +01:00
parent f352008958
commit afae86bfb4
2 changed files with 27 additions and 38 deletions
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48
src/movepick.cpp
View file

@ -18,11 +18,6 @@
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
////
//// Includes
////
#include <cassert>
#include "history.h"
@ -31,11 +26,6 @@
#include "search.h"
#include "value.h"
////
//// Local definitions
////
namespace {
enum MovegenPhase {
@ -58,11 +48,6 @@ namespace {
}
////
//// Functions
////
/// Constructor for the MovePicker class. Apart from the position for which
/// it is asked to pick legal moves, MovePicker also wants some information
/// to help it to return the presumably good moves first, to decide which
@ -77,21 +62,22 @@ MovePicker::MovePicker(const Position& p, Move ttm, Depth d, const History& h,
badCaptureThreshold = 0;
badCaptures = moves + MOVES_MAX;
assert(d > DEPTH_ZERO);
pinned = p.pinned_pieces(pos.side_to_move());
if (ss && !p.is_check())
if (p.is_check())
{
ttMoves[1].move = killers[0].move = killers[1].move = MOVE_NONE;
phasePtr = EvasionsPhaseTable;
}
else
{
ttMoves[1].move = (ss->mateKiller == ttm) ? MOVE_NONE : ss->mateKiller;
searchTT |= ttMoves[1].move;
killers[0].move = ss->killers[0];
killers[1].move = ss->killers[1];
} else
ttMoves[1].move = killers[0].move = killers[1].move = MOVE_NONE;
if (p.is_check())
phasePtr = EvasionsPhaseTable;
else if (d > DEPTH_ZERO)
{
// Consider sligtly negative captures as good if at low
// depth and far from beta.
if (ss && ss->eval < beta - PawnValueMidgame && d < 3 * ONE_PLY)
@ -99,6 +85,23 @@ MovePicker::MovePicker(const Position& p, Move ttm, Depth d, const History& h,
phasePtr = MainSearchPhaseTable;
}
phasePtr += int(!searchTT) - 1;
go_next_phase();
}
MovePicker::MovePicker(const Position& p, Move ttm, Depth d, const History& h)
: pos(p), H(h) {
int searchTT = ttm;
ttMoves[0].move = ttm;
ttMoves[1].move = MOVE_NONE;
assert(d <= DEPTH_ZERO);
pinned = p.pinned_pieces(pos.side_to_move());
if (p.is_check())
phasePtr = EvasionsPhaseTable;
else if (d >= DEPTH_QS_CHECKS)
phasePtr = QsearchWithChecksPhaseTable;
else
@ -354,4 +357,3 @@ Move MovePicker::get_next_move() {
go_next_phase();
}
}

17
src/movepick.h
View file

@ -17,23 +17,13 @@
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#if !defined MOVEPICK_H_INCLUDED
#define MOVEPICK_H_INCLUDED
////
//// Includes
////
#include "depth.h"
#include "history.h"
#include "position.h"
////
//// Types
////
struct SearchStack;
/// MovePicker is a class which is used to pick one legal move at a time from
@ -49,7 +39,8 @@ class MovePicker {
MovePicker& operator=(const MovePicker&); // silence a warning under MSVC
public:
MovePicker(const Position& p, Move ttm, Depth d, const History& h, SearchStack* ss = NULL, Value beta = -VALUE_INFINITE);
MovePicker(const Position& p, Move ttm, Depth d, const History& h, SearchStack* ss, Value beta);
MovePicker(const Position& p, Move ttm, Depth d, const History& h);
Move get_next_move();
int number_of_evasions() const;
@ -70,10 +61,6 @@ private:
};
////
//// Inline functions
////
/// MovePicker::number_of_evasions() simply returns the number of moves in
/// evasions phase. It is intended to be used in positions where the side to
/// move is in check, for detecting checkmates or situations where there is