http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58524
Bug ID: 58524 Summary: [4.9 Regression] ICE mem_ref_in_stmt, at tree-ssa-loop-im.c:677 Product: gcc Version: 4.9.0 Status: UNCONFIRMED Keywords: build, ice-on-valid-code Severity: normal Priority: P3 Component: middle-end Assignee: unassigned at gcc dot gnu.org Reporter: burnus at gcc dot gnu.org Bootstrapping GCC leads to (in stage 3): ../../gcc/ira-color.c: In function 'void ira_color()': ../../gcc/ira-color.c:4414:1: internal compiler error: in mem_ref_in_stmt, at tree-ssa-loop-im.c:677 That's: hash = iterative_hash_expr (*mem, 0); ref = memory_accesses.refs.find_with_hash (*mem, hash); gcc_assert (ref != NULL); If I unset MALLOC_PERTURB_, it works, which implies that some uninitialized memory is used. The cause should be some recent patch as a 20130924 build worked.