/// _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
+# include <nmmintrin.h> // Intel and Microsoft header for _mm_popcnt_u64()
#endif
#if !defined(NO_PREFETCH) && (defined(__INTEL_COMPILER) || defined(_MSC_VER))