I have been using the last gfortran trunk snapshot (Nov 7, 2008), from www.equation.com.
My matrix code is unable to converge using the -O3 flag. Unfortunately I can't send the code so this is likely not very useful except for me to say that the code generated through using -O3 did not work while using -O2 did work. -- Summary: gfortran code generation error using -03 that is removed when using -O2 Product: gcc Version: 4.4.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: fortran AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: rich dot otero at gmail dot com http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38060