#pragma omp parallel for


do i = 1,n
   z(i) = x(i) * y(i)
enddo


do i = 2,n
   z(i) = z(i-1)*2
enddo


do i = 2,n
   z(i) = z(i)*2**(i-1)
enddo


437, Complex loop carried dependence of e_k prevents parallelization
Loop carried reuse of e_k prevents parallelization