https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78709
--- Comment #3 from ErikaMolnar <erika.molnar at cyberthorstudios dot com> --- Thank you for your reply. To make it work on -Os I need to make the following change in tree-loop-distribution.c: - /* Only optimize hot loops. */ - if (!optimize_loop_for_speed_p (loop)) - continue; Could yo make this modification in the next release?