Use optimized pop_1st_bit() only under Windows

[stockfish] / src / bitboard.cpp

diff --git a/src/bitboard.cpp b/src/bitboard.cpp
index e4fcb7ce438de974b17303135427868b441ad002..458f9318f9d00d0d6c3b716c6268a78d7caef9de 100644 (file)
--- a/src/bitboard.cpp
+++ b/src/bitboard.cpp
@@ -339,7 +339,7 @@ Square first_1(Bitboard b) {
 /// pop_1st_bit() finds and clears the least significant nonzero bit in a
 /// nonzero bitboard.
 
-#if defined(USE_32BIT_ATTACKS)
+#if defined(USE_32BIT_ATTACKS) && defined(_WIN32)
 
 Square pop_1st_bit(Bitboard *bb) {