X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fbitboard.h;h=9704839408e8ad7d9698222ecb2b664d0235cc53;hp=2a4ab1666b7509b42e80a932d11e536fc0071a2d;hb=927f1b0bd30a5b2cfdcdf163f26f528738509064;hpb=d9113d127b491db0a427a416217d55d3d298c25e

diff --git a/src/bitboard.h b/src/bitboard.h
index 2a4ab166..97048394 100644
--- a/src/bitboard.h
+++ b/src/bitboard.h
@@ -43,12 +43,12 @@ const Bitboard Rank6BB = Rank1BB << (8 * 5);
 const Bitboard Rank7BB = Rank1BB << (8 * 6);
 const Bitboard Rank8BB = Rank1BB << (8 * 7);
 
-extern const Bitboard SquaresByColorBB[2];
-extern const Bitboard FileBB[8];
-extern const Bitboard NeighboringFilesBB[8];
-extern const Bitboard ThisAndNeighboringFilesBB[8];
-extern const Bitboard RankBB[8];
-extern const Bitboard InFrontBB[2][8];
+extern Bitboard SquaresByColorBB[2];
+extern Bitboard FileBB[8];
+extern Bitboard NeighboringFilesBB[8];
+extern Bitboard ThisAndNeighboringFilesBB[8];
+extern Bitboard RankBB[8];
+extern Bitboard InFrontBB[2][8];
 
 extern Bitboard SetMaskBB[65];
 extern Bitboard ClearMaskBB[65];
@@ -257,15 +257,25 @@ inline bool squares_aligned(Square s1, Square s2, Square s3) {
 /// pop_1st_bit() finds and clears the least significant nonzero bit in a
 /// nonzero bitboard.
 
-#if defined(USE_BSFQ) // Assembly code by Heinz van Saanen
+#if defined(USE_BSFQ)
 
-inline Square first_1(Bitboard b) {
+#if defined(_MSC_VER) && !defined(__INTEL_COMPILER)
+
+FORCE_INLINE Square first_1(Bitboard b) {
+   unsigned long index;
+   _BitScanForward64(&index, b);
+   return (Square) index;
+}
+#else
+
+FORCE_INLINE Square first_1(Bitboard b) { // Assembly code by Heinz van Saanen
   Bitboard dummy;
   __asm__("bsfq %1, %0": "=r"(dummy): "rm"(b) );
-  return (Square)(dummy);
+  return (Square) dummy;
 }
+#endif
 
-inline Square pop_1st_bit(Bitboard* b) {
+FORCE_INLINE Square pop_1st_bit(Bitboard* b) {
   const Square s = first_1(*b);
   *b &= ~(1ULL<<s);
   return s;