#if defined(_WIN64) && defined(_MSC_VER) // No Makefile used
# include <intrin.h> // MSVC popcnt and bsfq instrinsics
# define IS_64BIT
#if defined(_WIN64) && defined(_MSC_VER) // No Makefile used
# include <intrin.h> // MSVC popcnt and bsfq instrinsics
# define IS_64BIT