Open Source Computer Vision Library https://opencv.org/
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#ifdef _MSC_VER
# include <nmmintrin.h>
# if defined(_M_X64)
# define CV_POPCNT_U64 _mm_popcnt_u64
# endif
# define CV_POPCNT_U32 _mm_popcnt_u32
#else
# include <popcntintrin.h>
# 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;
}