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