integer count, datatype
integer i
-! if (datatype .ne. MPI_INTEGER) then
-! print *, 'Invalid datatype (',datatype,') passed to user_op()'
-! return
-! endif
+ if (datatype .ne. MPI_INTEGER) then
+ print *, 'Invalid datatype (',datatype,') passed to user_op()'
+ return
+ endif
do i=1, count
cout(i) = cin(i) + cout(i)