https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81408
--- Comment #8 from amker at gcc dot gnu.org --- After I deleted -funsafe-loop-optimizations in GIMPLE passes, there is no "unsafe-loop-optimizations" for any GIMPLE optimizers. This message in actuality means missed loop optimizations. I am preparing patch dumping the message to category MSG_MISSED_OPTIMIZATION. On the other hand, I noticed the niter analysis for c++ iterator loop is bad. I will create another PR for it.
