#ifdef _MSC_VER # include # if defined(_M_X64) # define CV_POPCNT_U64 _mm_popcnt_u64 # endif # define CV_POPCNT_U32 _mm_popcnt_u32 #else # include # if defined(__x86_64__) # define CV_POPCNT_U64 __builtin_popcountll # endif # define CV_POPCNT_U32 __builtin_popcount #endif int main() { #ifdef CV_POPCNT_U64 int i = CV_POPCNT_U64(1); #endif int j = CV_POPCNT_U32(1); return 0; }