https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79721
--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> --- Created attachment 40844 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=40844&action=edit untested patch After this patch re-writing to unsigned in final value replacement shouldn't be needed anymore.