Enable _BitScanForward64 at runtime

[stockfish] / src / bitboard.cpp

diff --git a/src/bitboard.cpp b/src/bitboard.cpp
index f7a6ba27626e114b065aa23d7efdd6895dda7d5e..3dfa040b8e2b0bd513926fd546a6ea4ba85b8382 100644 (file)
--- a/src/bitboard.cpp
+++ b/src/bitboard.cpp
@@ -340,7 +340,7 @@ Square pop_1st_bit(Bitboard *b) {
 
 #endif
 
-#else
+#else // defined(USE_FOLDED_BITSCAN)
 
 static const int BitTable[64] = {
   0, 1, 2, 7, 3, 13, 8, 19, 4, 25, 14, 28, 9, 34, 20, 40, 5, 17, 26, 38, 15,