Input for livermore loops

Is it possible to use some random input data for using the kernels
given in livermore loops ? Is there any limit on the maximum size of
the array/data used as input to the kernel ?

For example, in kernel 12 (given below) is there any restriction on
the size of the value 'n' being used in this loop?

    /*

*******************************************************************
     *   Kernel 12 -- first difference

*******************************************************************
     */
    ntest = 12;

    do {
       for ( k=0 ; k<n ; k++ ) {
            x[k] = y[k+1] - y[k];
        }
    } while( test( ntest ) > 0 );