https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62289
--- Comment #5 from Tobias Burnus <burnus at gcc dot gnu.org> --- (In reply to Tobias Burnus from comment #3) > Namely: > > This is a bug in ISL. Theyâll fix it in a new version of ISL. > > https://groups.google.com/forum/#!topic/isl-development/SeNZf5IA-Lk Seems to be fixed by the commit(s): http://repo.or.cz/w/isl.git/history/HEAD:/test_inputs/codegen/roman.c thus (untested by me) a post ISL 0.13 should work.