X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Ftypes.h;h=1440f73b44cca14e8513ef58debee582414600f2;hp=c43eee3df14ed3bea9692b44fad299d40bde1f71;hb=4c5cbb1b14b283679e3e0096b7973c97b75088f3;hpb=87886128288a82dabc78c2ce6dd688f42eaf8212

diff --git a/src/types.h b/src/types.h
index c43eee3d..1440f73b 100644
--- a/src/types.h
+++ b/src/types.h
@@ -60,13 +60,12 @@
 /// _WIN64             Building on Windows 64 bit
 
 #if defined(_WIN64) && defined(_MSC_VER) // No Makefile used
-#  include <intrin.h> // MSVC popcnt and bsfq instrinsics
+#  include <intrin.h> // Microsoft header for _BitScanForward64()
 #  define IS_64BIT
-#  define USE_BSFQ
 #endif
 
-#if defined(USE_POPCNT) && defined(__INTEL_COMPILER) && defined(_MSC_VER)
-#  include <nmmintrin.h> // Intel header for _mm_popcnt_u64() intrinsic
+#if defined(USE_POPCNT) && (defined(__INTEL_COMPILER) || defined(_MSC_VER))
+#  include <nmmintrin.h> // Intel and Microsoft header for _mm_popcnt_u64()
 #endif
 
 #if !defined(NO_PREFETCH) && (defined(__INTEL_COMPILER) || defined(_MSC_VER))
@@ -210,15 +209,17 @@ enum Depth {
 
   ONE_PLY = 1,
 
-  DEPTH_ZERO          =  0,
-  DEPTH_QS_CHECKS     =  0,
-  DEPTH_QS_NO_CHECKS  = -1,
-  DEPTH_QS_RECAPTURES = -5,
+  DEPTH_ZERO          =  0 * ONE_PLY,
+  DEPTH_QS_CHECKS     =  0 * ONE_PLY,
+  DEPTH_QS_NO_CHECKS  = -1 * ONE_PLY,
+  DEPTH_QS_RECAPTURES = -5 * ONE_PLY,
 
-  DEPTH_NONE = -6,
-  DEPTH_MAX  = MAX_PLY
+  DEPTH_NONE = -6 * ONE_PLY,
+  DEPTH_MAX  = MAX_PLY * ONE_PLY
 };
 
+static_assert(!(ONE_PLY & (ONE_PLY - 1)), "ONE_PLY is not a power of 2");
+
 enum Square {
   SQ_A1, SQ_B1, SQ_C1, SQ_D1, SQ_E1, SQ_F1, SQ_G1, SQ_H1,
   SQ_A2, SQ_B2, SQ_C2, SQ_D2, SQ_E2, SQ_F2, SQ_G2, SQ_H2,