Currently, for code like


we compare the ADVANCE string in the library.  This is wasteful
in the vast majority of cases, where the corresponding strings
are constant.

We should do the string comparison in the front end, where it
can be folded, and pass a bit field to the library.

Something for the ABI cleanup, when it happens in 4.7.

           Summary: [ABI cleanup] Move runtime parsing of I/O control list
                    to front end
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: enhancement
          Priority: P3
         Component: fortran
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: tkoenig at gcc dot gnu dot org

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