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.
