https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95804
--- Comment #2 from bin cheng <amker at gcc dot gnu.org> --- (In reply to Richard Biener from comment #1) > Confirmed. We seem to end up with a reduction partition not in the last > position thus miss some required partition merging. Sorry for the breakage. Whew, this part IS can of worms. Will investigate it.