[Bug fortran/31593] Invariant DO loop variables and subroutines

[rguenth at gcc dot gnu dot org]

------- Comment #11 from rguenth at gcc dot gnu dot org  2009-08-13 13:30 -------
  DO i = 1,10
    call bar(i)
  END DO

if bar may not modify i then the frontend can simply communicate that to the
middle-end by doing

  DO i = 1,10
    j = i;
    call bar (j)
  END DO

likewise if loop bounds are not allowed to be changed (are they?)

  Do i = n,m
    ...

to
  tmp1 = n
  tmp2 = m
  Do i = tmp1,tmp2
    ...


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31593