[Bug fortran/52893] New: [4.7/4.8 Regression] Moving functions out of implied DO loops

[tkoenig at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52893

             Bug #: 52893
           Summary: [4.7/4.8 Regression] Moving functions out of implied
                    DO loops
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Keywords: wrong-code
          Severity: normal
          Priority: P3
         Component: fortran
        AssignedTo: tkoe...@gcc.gnu.org
        ReportedBy: tkoe...@gcc.gnu.org


The following aborts with -ffrontend-optimize:

program test
  integer, parameter :: N = 4
  integer, parameter :: dp=kind(1.d0)
  real(kind=dp), parameter :: pi=4*atan(1._dp)
  real(kind=dp), parameter :: eps = 1.e-14_dp
  real(kind=dp) :: h1(0:N-1), h2(0:N-1)
  integer i

  i = 1
  h1 = [(cos(2*pi*mod(i*k,N)/N),k=0,N/2), &
       & (sin(2*pi*mod(i*k,N)/N),k=1,N/2-1)]
  h2 = (/ 1._dp, 0._dp, -1._dp, 1._dp /)
  if (any(abs(h1 - h2) > eps)) call abort
end program test