X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fmovegen.cpp;h=c5d76afa43b0bc59e7b43b94174ef08dcb694d70;hp=fafa65ee53f11100d396d717bb374ee32a5032aa;hb=699bae632f283746a3eee15c0950fcdbca8a355e;hpb=5f222f1d98c9b4cb07aa2303f085c2064e7ea77a

diff --git a/src/movegen.cpp b/src/movegen.cpp
index fafa65ee..c5d76afa 100644
--- a/src/movegen.cpp
+++ b/src/movegen.cpp
@@ -21,6 +21,8 @@
 #include "movegen.h"
 #include "position.h"
 
+namespace Stockfish {
+
 namespace {
 
   template<GenType Type, Direction D>
@@ -180,17 +182,17 @@ namespace {
 
     Bitboard bb = piecesToMove & pos.pieces(Pt);
 
+    if (!bb)
+        return moveList;
+
+    [[maybe_unused]] const Bitboard checkSquares = pos.check_squares(Pt);
+
     while (bb) {
         Square from = pop_lsb(&bb);
 
-        if (Checks && (Pt == BISHOP || Pt == ROOK || Pt == QUEEN)
-            && !(attacks_bb<Pt>(from) & target & pos.check_squares(Pt)))
-            continue;
-
         Bitboard b = attacks_bb<Pt>(from, pos.pieces()) & target;
-
-        if (Checks)
-            b &= pos.check_squares(Pt);
+        if constexpr (Checks)
+            b &= checkSquares;
 
         while (b)
             *moveList++ = make_move(from, pop_lsb(&b));
@@ -205,7 +207,7 @@ namespace {
 
     static_assert(Type != LEGAL, "Unsupported type in generate_all()");
 
-    constexpr bool Checks = Type == QUIET_CHECKS; // Reduce template instantations
+    constexpr bool Checks = Type == QUIET_CHECKS; // Reduce template instantiations
     Bitboard target, piecesToMove = pos.pieces(Us);
 
     if(Type == QUIET_CHECKS)
@@ -221,11 +223,8 @@ namespace {
             target = ~pos.pieces();
             break;
         case EVASIONS:
-        {
-            Square checksq = lsb(pos.checkers());
-            target = between_bb(pos.square<KING>(Us), checksq) | checksq;
+            target = between_bb(pos.square<KING>(Us), lsb(pos.checkers())) | pos.checkers();
             break;
-        }
         case NON_EVASIONS:
             target = ~pos.pieces(Us);
             break;
@@ -257,7 +256,7 @@ namespace {
 
 
 /// <CAPTURES>     Generates all pseudo-legal captures plus queen and checking knight promotions
-/// <QUIETS>       Generates all pseudo-legal non-captures and underpromotions(except checking knight)
+/// <QUIETS>       Generates all pseudo-legal non-captures and underpromotions (except checking knight)
 /// <NON_EVASIONS> Generates all pseudo-legal captures and non-captures
 ///
 /// Returns a pointer to the end of the move list.
@@ -280,8 +279,8 @@ template ExtMove* generate<QUIETS>(const Position&, ExtMove*);
 template ExtMove* generate<NON_EVASIONS>(const Position&, ExtMove*);
 
 
-/// generate<QUIET_CHECKS> generates all pseudo-legal non-captures.
-/// Returns a pointer to the end of the move list.
+/// generate<QUIET_CHECKS> generates all pseudo-legal non-captures giving check,
+/// except castling. Returns a pointer to the end of the move list.
 template<>
 ExtMove* generate<QUIET_CHECKS>(const Position& pos, ExtMove* moveList) {
 
@@ -354,7 +353,7 @@ ExtMove* generate<LEGAL>(const Position& pos, ExtMove* moveList) {
   moveList = pos.checkers() ? generate<EVASIONS    >(pos, moveList)
                             : generate<NON_EVASIONS>(pos, moveList);
   while (cur != moveList)
-      if (   (pinned || from_sq(*cur) == ksq || type_of(*cur) == EN_PASSANT)
+      if (  ((pinned && pinned & from_sq(*cur)) || from_sq(*cur) == ksq || type_of(*cur) == EN_PASSANT)
           && !pos.legal(*cur))
           *cur = (--moveList)->move;
       else
@@ -362,3 +361,5 @@ ExtMove* generate<LEGAL>(const Position& pos, ExtMove* moveList) {
 
   return moveList;
 }
+
+} // namespace Stockfish