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