Revert "Generalize shift_bb() to handle double pushes"

[stockfish] / src / bitboard.h

diff --git a/src/bitboard.h b/src/bitboard.h
index 888e96905469b1c907340a79beaca613d2b90c41..9814268327afdd9c269d728077d1f82770035c87 100644 (file)
--- a/src/bitboard.h
+++ b/src/bitboard.h
@@ -130,9 +130,10 @@ inline int rank_distance(Square s1, Square s2) {
 template<Square Delta>
 inline Bitboard shift_bb(Bitboard b) {
 
-  return  Delta == DELTA_NE ? (b & ~FileHBB) << 9 : Delta == DELTA_SE ? (b & ~FileHBB) >> 7
+  return  Delta == DELTA_N  ?  b             << 8 : Delta == DELTA_S  ?  b             >> 8
+        : Delta == DELTA_NE ? (b & ~FileHBB) << 9 : Delta == DELTA_SE ? (b & ~FileHBB) >> 7
         : Delta == DELTA_NW ? (b & ~FileABB) << 7 : Delta == DELTA_SW ? (b & ~FileABB) >> 9
-        : Delta > 0 ? b << Delta : b >> -Delta;
+        : 0;
 }