gcc/testsuite/gfortran.fortran-torture/execute/pr57396.f90

   1 module testmod
   2   implicit none
   3
   4   contains
   5
   6   subroutine foo(n)
   7     integer, intent(in) :: n
   8     real :: r(0:n,-n:n), a(0:n,-n:n), dj
   9     integer :: k, j
  10
  11     ! initialize with some dummy values
  12     do j = -n, n
  13       a(:, j) = j
  14       r(:,j) = j + 1
  15     end do
  16
  17     ! here be dragons
  18     do k = 0, n
  19       dj = r(k, k - 2) * a(k, k - 2)
  20       r(k,k) = a(k, k - 1) * dj
  21     enddo
  22
  23     if (r(0,0) .ne. -2.) STOP 1
  24
  25   end subroutine
  26
  27 end module
  28
  29 program test
  30   use testmod
  31   implicit none
  32   call foo(5)
  33 end program