i used to think this is duplicate bug of 32372 because it is invoked by similar source. but that testcase works fine.
-- Summary: [4.3 Regression] internal compiler error: in df_refs_verify, at df-scan.c:4058 Product: gcc Version: 4.3.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: tree-optimization AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: jojelino at gmail dot com http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32504