Improvement of self-written OpenCL-Funktion (GaussianBlur)

unrolling the loop on c improved the kernel. After reading the Best Practice Guide i tried to improve my GaussianBlur function like suggested in 1.6.1.5.

With help from the example in the guide and the exampleimplementation of an Sobel-Filter on: https://www.altera.com/support/support-resources/design-examples/design-software/opencl/sobel-filter.html

But my output of the kernel isn´t correct.

Kernel-Code:

#define maskWidth 7
# define COLS 640
__kernel void gaussneu(global uchar * restrict frame_in, global uchar * restrict frame_out,
           const int iterations/*, const int COLS*/)
{
	// Filter coefficients
	float mask =
	{
		{ 0.0049, 0.0092, 0.0134, 0.0152, 0.0134, 0.0092, 0.0049},
		{ 0.0092, 0.0172, 0.0250, 0.0283, 0.0250, 0.0172, 0.0092},
		{ 0.0134, 0.0250, 0.0364, 0.0412, 0.0364, 0.0250, 0.0134},
		{ 0.0152, 0.0283, 0.0412, 0.0467, 0.0412, 0.0283, 0.0152},
		{ 0.0134, 0.0250, 0.0364, 0.0412, 0.0364, 0.0250, 0.0134},
		{ 0.0092, 0.0172, 0.0250, 0.0283, 0.0250, 0.0172, 0.0092},
		{ 0.0049, 0.0092, 0.0134, 0.0152, 0.0134, 0.0092, 0.0049},
	};	
	// Pixel buffer of 6 rows and 7 extra pixels
	int rows;
	// The initial iterations are used to initialize the pixel buffer.
	int count = -(6 * COLS + 7);
	while (count != iterations) 
	{
		// Each cycle, shift a new pixel into the buffer.
		// Unrolling this loop allows the compile to infer a shift register.
	# pragma unroll
		for (int i = COLS * 6 + 6; i > 0; --i) 
		{
		    rows = rows;
		}
		rows = count >= 0 ? frame_in : 0; // if count >=0 -> true rows = frame_in
		float sum = 0;
		// With these loops unrolled, one convolution can be computed every cycle.
	# pragma unroll
		for (int i = 0; i < maskWidth; ++i) 
		{
		# pragma unroll
			for (int j = 0; j < maskWidth; ++j) 
			{
				uchar pixel = rows;
				sum += mask*pixel;
			}
		}
		if (count >= 0) {
		frame_out = sum;
		}
		count++;
    	}
}

Can someone tell me whats the problem?

Also I think there is an error on the sobel.cl file from the altera example in this part:

         int temp = abs(x_dir) + abs(y_dir);
        unsigned int clamped;
        if (temp > threshold) {
            clamped = 0xffffff;
        } else {
            clamped = 0;
        }
        if (count >= 0) {
            frame_out = clamped;
        }

the computet value temp is never set, the output values only can take the values 0 or 0xffffffff