https://gcc.gnu.org/bugzilla/show_bug.cgi?id=128226
--- Comment #5 from Josef Melcr <jmelcr at gcc dot gnu.org> --- Created attachment 66039 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=66039&action=edit reduced testcase Can confirm it's the assume, most likely r17-5633-g684c9811dee657. I'll take a look.
