[Bug fortran/31301] New: Extremely long compilation time

[burnus at gcc dot gnu dot org]

The following program compiles with g95 and f95 in less than a second. gfortran
needs more than several minutes (until I lost patience).

I think gfortran does not enter an endless loop but tries to solve the h1
assignment explicitly. (At least is seems to do this with a much stripped down
version.)

Full example:
http://home.comcast.net/~kmbtib/fft64t.i90
http://home.comcast.net/~kmbtib/fft64t.f90

The slow-down line is:
  h1 = (/(sum((/(exp(-2*pi*(0,1)*mod(k*L,N)/N)*h2(L),L=0,N-1)/)),k=0,N-1)/)


-- 
           Summary: Extremely long compilation time
           Product: gcc
           Version: 4.3.0
            Status: UNCONFIRMED
          Keywords: compile-time-hog
          Severity: normal
          Priority: P3
         Component: fortran
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: burnus at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31301