https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84478
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> --- Created attachment 43474 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43474&action=edit gcc8-pr84478.patch Untested fix. Sadly the warning code for some weird reason relies on the bogus PHI handling (strangely COND_EXPR is handled differently), but obviously in code generation we can't allow that, if there is any PHI argument or any COND_EXPR we don't know anything about, we can't use it for range info.
