__new_result definitely overflows, and this is *bad* (at least in principle ;) when it's signed. I have a patch in testing which has small (probably bearable) performance implications.
-- Summary: signed integer overflow in num_get<>::_M_extract_int Product: gcc Version: 4.0.0 Status: UNCONFIRMED Severity: normal Priority: P2 Component: libstdc++ AssignedTo: pcarlini at suse dot de ReportedBy: pcarlini at suse dot de CC: gcc-bugs at gcc dot gnu dot org http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21209