[Bug libfortran/38654] New: Fortran I/O speedup

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

A bug to hang a few ideas for I/O speedup from.

We have Jerry's first I/O refactoring results (splitting
into formatted read and write) at

http://gcc.gnu.org/ml/fortran/2008-12/msg00114.html

We also would want to pre-parse format strings.

I would really like to pre-parse the option strings
like advance="NO".  If we handle that in the front-end,
we should usually be able to avoid any run-time overhead
at all, and people who use variables should be no worse
off than now.  This should also reduce the size requirements
of the dt structures by a lot.

Finally, the way we parse and write our floating point
values appears to be slow.

What we also should have is a way to hang information
private to the library off the unit number, so we can
extend that.


-- 
           Summary: Fortran I/O speedup
           Product: gcc
           Version: 4.4.0
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: enhancement
          Priority: P3
         Component: libfortran
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: tkoenig at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38654