gcc/testsuite/gfortran.dg/array_constructor_34.f90

   1 ! { dg-do compile }
   2 ! PR32489 Endless loop when compiling.
   3 ! Derived from fft257.f90, Public domain 2004 James Van Buskirk.
   4 ! Note: The problem solved here was not an infinite loop issue. Middle-end
   5 ! could not handle the array constructor unfolded by the front end.
   6 ! WARNING: Potential resource hog.
   7 ! Jerry DeLisle  <jvdelisle@gcc.gnu.org>
   8 program test
   9    implicit none
  10    integer, parameter :: dp = selected_real_kind(15,300)
  11    integer, parameter :: N = 257
  12    complex(dp) h1(0:N-1)
  13    complex(dp) h2(0:N-1)
  14    complex(dp) hh(0:N-1)
  15    complex(dp), parameter :: ri(2) = (/(1,0),(0,1)/)
  16    integer i, j, k, L
  17    real(dp) pi
  18
  19    pi = 4*atan(1.0_dp)
  20    do i = 0, N-1
  21      do j = 1, 2
  22        h2 = 0
  23        h2(i) = ri(j)
  24        h1 = (/(sum((/(exp(-2*pi*(0,1)*mod(k*L,N)/N)*h2(L),L=0,N-1)/)),k=0,N-1)/)
  25      end do
  26    end do
  27 end program test