visited = sbitmap_alloc (num_ssa_names); does not come with a call to sbitmap_clear.
-- Summary: wrong use of sbitmap in tree-ssa-copy.c Product: gcc Version: unknown Status: UNCONFIRMED Severity: normal Priority: P2 Component: tree-optimization AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: kazu at cs dot umass dot edu CC: gcc-bugs at gcc dot gnu dot org http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21849