[Bug middle-end/42393] [4.5 Regression] [graphite] internal compiler error: in check_loop_closed_ssa_use

["spop at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #11 from spop at gcc dot gnu dot org  2010-01-08 18:58 -------
On the graphite branch this fails with the following options:
gfortran -O2 -fno-loop-block -fno-loop-interchange -fno-loop-strip-mine
-fgraphite-identity pr42393.f90
Here is a further reduced testcase.

MODULE beta_gamma_psi
  INTEGER, PARAMETER :: dp=KIND(0.0D0)
CONTAINS
  FUNCTION basym () RESULT(fn_val)
    REAL(dp) :: b0(21), bsum, d(21)
    DO n = 2, num, 2
       DO i = n, np1
          b0(1) = 1
          DO m = 2, i
             mm1 = m - 1
             DO j = 1, mm1
                bsum = bsum + b0(j)
             END DO
             b0(m) = bsum
          END DO
          d(i) = -b0(i)
       END DO
       sum = sum + d(n)
    END DO
    fn_val = sum
  END FUNCTION basym
END MODULE beta_gamma_psi

The problem seems to be in the code generation when replacing the end
value from a loop.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42393