!$acc parallel loop collapse (3)
!$acc parallel loop 
!$acc loop private (stencil, vals, d3_vals)
!$acc parallel loop collapse (3)
!$acc parallel loop 
!$acc loop private (stencil, vals, d3_vals)
!$acc parallel loop collapse (3)
!$acc parallel loop collapse (2)
!$acc parallel loop 
!$acc parallel loop collapse (2) private (xloc, mnt_deriv, x)
