https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80163
--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> --- Created attachment 41045 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=41045&action=edit gcc7-pr80163-2.patch Untested patch to reject the sign-extension to int128.