https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59708
--- Comment #25 from Jakub Jelinek <jakub at gcc dot gnu.org> --- Created attachment 34179 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=34179&action=edit gcc5-pr59708.patch Untested fix for the ppc32 builtin-arith-overflow-14.c failure. expand_widening_mult something, const0_rtx was happily trying to expand double word shifts by -1.
