X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=src%2Fbitboard.h;h=7330a199e1fba11a416da7a37fe379f543eaa9de;hb=4d0a6c5a6f80fbb417318d6b5b22c5aab23e6de4;hp=3ff0408a61b16faab014965ed063af2c85124a0c;hpb=64d29a633066e39b62af5ee0bbf32645994744ec;p=stockfish

diff --git a/src/bitboard.h b/src/bitboard.h
index 3ff0408a..7330a199 100644
--- a/src/bitboard.h
+++ b/src/bitboard.h
@@ -21,6 +21,7 @@
 #ifndef BITBOARD_H_INCLUDED
 #define BITBOARD_H_INCLUDED
 
+#include <string>
 #include "types.h"
 
 namespace Bitboards {
@@ -241,6 +242,9 @@ FORCE_INLINE unsigned magic_index(Square s, Bitboard occ) {
   Bitboard* const Magics = Pt == ROOK ? RMagics : BMagics;
   unsigned* const Shifts = Pt == ROOK ? RShifts : BShifts;
 
+  if (HasPext)
+      return unsigned(_pext_u64(occ, Masks[s]));
+
   if (Is64Bit)
       return unsigned(((occ & Masks[s]) * Magics[s]) >> Shifts[s]);