def cAddVec():
    """
    Return the kernel source for cAddVec. 
    """
    R = """
        KERNEL void cAddVec( 
        GLOBAL_MEM float2 *a,
        GLOBAL_MEM float2 *b,
        GLOBAL_MEM float2 *dest)
        {const int i = get_global_id(0);
        dest[i]= a[i]+b[i];
        };"""
    return R
