adding opencl convolution benchmark

tests/opencl/convolution/kernel.cl

@@ -0,0 +1,32 @@
+__kernel void conv3x3(__global float* output, 
+                      __global float* input,
+                      __global float* weights, 
+                      const int width, 
+                      const int height) 
+{
+    int x = get_global_id(0);
+    int y = get_global_id(1);
+
+    // Adjust for padded borders
+    int paddedWidth = width + 2;
+    int paddedX = x + 1;
+    int paddedY = y + 1;
+
+    // Compute the convolution sum
+    float sum = 0.0f;
+
+    sum += input[(paddedY - 1) * paddedWidth + (paddedX - 1)] * weights[0]; // Top-left
+    sum += input[(paddedY - 1) * paddedWidth + paddedX] * weights[1];       // Top-center
+    sum += input[(paddedY - 1) * paddedWidth + (paddedX + 1)] * weights[2]; // Top-right
+
+    sum += input[paddedY * paddedWidth + (paddedX - 1)] * weights[3];       // Middle-left
+    sum += input[paddedY * paddedWidth + paddedX] * weights[4];             // Center
+    sum += input[paddedY * paddedWidth + (paddedX + 1)] * weights[5];       // Middle-right
+
+    sum += input[(paddedY + 1) * paddedWidth + (paddedX - 1)] * weights[6]; // Bottom-left
+    sum += input[(paddedY + 1) * paddedWidth + paddedX] * weights[7];       // Bottom-center
+    sum += input[(paddedY + 1) * paddedWidth + (paddedX + 1)] * weights[8]; // Bottom-right
+
+    // Store the result in the output array
+    output[y * width + x] = sum;
+}