Function countNonZero_

deps/opencv/modules/core/src/stat.cpp:217–227

template<typename T>
static int countNonZero_(const T* src, int len )
{
    int i=0, nz = 0;
    #if CV_ENABLE_UNROLLED
    for(; i <= len - 4; i += 4 )
        nz += (src[i] != 0) + (src[i+1] != 0) + (src[i+2] != 0) + (src[i+3] != 0);
    #endif
    for( ; i < len; i++ )
        nz += src[i] != 0;
    return nz;
}

static int countNonZero8u( const uchar* src, int len )
{