/// _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
#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))
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,