https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69725
--- Comment #15 from Martin Liška <marxin at gcc dot gnu.org> --- (In reply to Markus Trippelsdorf from comment #13) > (In reply to Richard Biener from comment #12) > > Confirmed. I suspect it's coverage mismatch errors causing the issue. > > No. The file in question changes between stages as shown in comment 10. > PGO of course can not work in this case. That mentioned, isn't that reason to close the PR as invalid?