VMS Help FORTRAN, /DIRECTIVES  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  /[NO]DIRECTIVES=(option[,...])  D=/DIRECTIVES=DEPENDENCE

  Controls whether specified compiler directives are used at
  compilation.

1 - DEPENDENCE

  Specifies whether Compaq Fortran 77 uses the CDEC$ INIT_DEP_FWD and CDEC$
  NOVECTOR directives.

  The CDEC$ INIT_DEP_FWD directive specifies that all data
  dependences in the succeeding loop are uniform and do not have a
  backward direction.  The CDEC$ NOVECTOR directive directs the
  compiler to avoid vectorizing an indicated DO loop.

2 - ALL

  Same interpretation as /DIRECTIVES=DEPENDENCE.

3 - NONE

  Same interpretation as /DIRECTIVES=NODEPENDENCE.