http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46331
Summary: Compilation time long with simple function in array constructor Product: gcc Version: 4.6.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: fortran AssignedTo: unassig...@gcc.gnu.org ReportedBy: jvdeli...@gcc.gnu.org program foo implicit none Integer :: i Integer, Parameter :: N = 10**4 Real, Dimension(N) :: xs ! Random points xs = (/ (rand(0), i=1,N) /) print *, xs end program The time spent in the FE is not bad, but the resulting translation is horrible and it wreaks havoc with the middle end and down the road. I think we should not expand this constructor at all, especially since 'i' is not used in the function expression. However, rand(0) needs to be called once for each element. That means it needs to be translated into: do i-1,N xs = rand(0) end do In otherwords, I think another special case in gfc_trans_assignment. There are other special cases already there.