https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81611
--- Comment #20 from Georg-Johann Lay <gjl at gcc dot gnu.org> --- A bit of the bloat reported in PR81625 is also due to missed post-inc addressing, so it might be worth a look if you are after more test cases. (Current 8.0.1 perfomrs better than 8.0.0 I used back then: only bloat of +22% compared to 3.4.6 instead of +26).
