Another push to perft speed

We don't need to generate captures and non
captures in a separate step. This gives another
7% push to perft speed.

yes, I know, it is totally useless :-)

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>

diff --git a/src/movegen.cpp b/src/movegen.cpp
index df2b9b87b1b2cd96adb42986b0e14e3be40c81dd..0598249d404e81bfa5fbb64eea5802e8dc47598d 100644 (file)
--- a/src/movegen.cpp
+++ b/src/movegen.cpp
@@ -140,6 +140,32 @@ MoveStack* generate_noncaptures(const Position& pos, MoveStack* mlist) {
 }
 
 
+/// generate_non_evasions() generates all pseudo-legal captures and
+/// non-captures. Returns a pointer to the end of the move list.
+
+MoveStack* generate_non_evasions(const Position& pos, MoveStack* mlist) {
+
+  assert(pos.is_ok());
+  assert(!pos.is_check());
+
+  Color us = pos.side_to_move();
+  Bitboard target = pos.pieces_of_color(opposite_color(us));
+
+  mlist = generate_piece_moves<PAWN, CAPTURE>(pos, mlist, us, target);
+  mlist = generate_piece_moves<PAWN, NON_CAPTURE>(pos, mlist, us, pos.empty_squares());
+
+  target |= pos.empty_squares();
+
+  mlist = generate_piece_moves<KNIGHT>(pos, mlist, us, target);
+  mlist = generate_piece_moves<BISHOP>(pos, mlist, us, target);
+  mlist = generate_piece_moves<ROOK>(pos, mlist, us, target);
+  mlist = generate_piece_moves<QUEEN>(pos, mlist, us, target);
+  mlist = generate_piece_moves<KING>(pos, mlist, us, target);
+  mlist = generate_castle_moves<KING_SIDE>(pos, mlist);
+  return  generate_castle_moves<QUEEN_SIDE>(pos, mlist);
+}
+
+
 /// generate_non_capture_checks() generates all pseudo-legal non-captures and knight
 /// underpromotions that give check. Returns a pointer to the end of the move list.
 
@@ -260,11 +286,8 @@ MoveStack* generate_moves(const Position& pos, MoveStack* mlist, bool pseudoLega
   Bitboard pinned = pos.pinned_pieces(pos.side_to_move());
 
   // Generate pseudo-legal moves
-  if (pos.is_check())
-      last = generate_evasions(pos, mlist);
-  else
-      last = generate_noncaptures(pos, generate_captures(pos, mlist));
-
+  last = pos.is_check() ? generate_evasions(pos, mlist)
+                        : generate_non_evasions(pos, mlist);
   if (pseudoLegal)
       return last;
 

diff --git a/src/movegen.h b/src/movegen.h
index 9a5042ce0cdf9e61f3b1ae7c8791d76880c7e020..723ab8ba1825b06ca5b37126493d35fbc199150e 100644 (file)
--- a/src/movegen.h
+++ b/src/movegen.h
@@ -36,6 +36,7 @@ extern MoveStack* generate_captures(const Position& pos, MoveStack* mlist);
 extern MoveStack* generate_noncaptures(const Position& pos, MoveStack* mlist);
 extern MoveStack* generate_non_capture_checks(const Position& pos, MoveStack* mlist);
 extern MoveStack* generate_evasions(const Position& pos, MoveStack* mlist);
+extern MoveStack* generate_non_evasions(const Position& pos, MoveStack* mlist);
 extern MoveStack* generate_moves(const Position& pos, MoveStack* mlist, bool pseudoLegal = false);
 extern bool move_is_legal(const Position& pos, const Move m, Bitboard pinned);
 extern bool move_is_legal(const Position& pos, const Move m);