Allow to disable spinlocks

[stockfish] / src / types.h

diff --git a/src/types.h b/src/types.h
index 23e69d2ef03a8cec91e05c3ff64650d5d99b3bcf..c8078546775d20ae49079317cc520b3e9545dc4f 100644 (file)
--- a/src/types.h
+++ b/src/types.h
@@ -31,6 +31,9 @@
 /// -DNO_PREFETCH | Disable use of prefetch asm-instruction. You may need this to
 ///               | run on some very old machines.
 ///
+/// -DNO_SPINLOCK | Use mutex instead of spinlocks. This is much slower, so you
+///               | really don't want to do this in general case.
+///
 /// -DUSE_POPCNT  | Add runtime support for use of popcnt asm-instruction. Works
 ///               | only in 64-bit mode and requires hardware with popcnt support.
 ///
@@ -417,7 +420,7 @@ inline MoveType type_of(Move m) {
 }
 
 inline PieceType promotion_type(Move m) {
-  return PieceType(((m >> 12) & 3) + 2);
+  return PieceType(((m >> 12) & 3) + KNIGHT);
 }
 
 inline Move make_move(Square from, Square to) {