!$acc host_data if(5)
!$acc end host_data 
!$acc host_data if(x==3)
!$acc host_data if(5) if_present
!$acc host_data use_device(a, b, c)
!$acc host_data use_device(a, b, c) if(5) if_present
!$acc host_data use_device(a, b, c, d) if(5) if_present
!$acc end host_data 
