https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68550
--- Comment #7 from Joost VandeVondele <Joost.VandeVondele at mat dot ethz.ch> --- (In reply to Sebastian Pop from comment #5) > fixed BTW, with this fixed, I can compile our CP2K code with -floop-nest-optimize at various -Ox and all seems correct. Thanks! I'll try to integrate '-floop-nest-optimize' in our nightly testers.