/ARCHITECTURE

  The /ARCHITECTURE qualifier specifies which version of the architecture to
  generate instructions for.

  The format of the /ARCHITECTURE qualifier is as follows:

     /ARCHITECTURE={GENERIC }
                   {HOST    }
                   {MERCED  }
                   {ITANIUM2}

  where:

     GENERIC        generate  instructions  that  are  appropriate  for  all
                    processors.  This option is the default.

     HOST           generate  instructions  for  the  processor   that   the
                    compiler is running on.

  The default is /ARCHITECTURE=GENERIC.