https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102997
--- Comment #5 from hubicka at kam dot mff.cuni.cz --- > Not seen on Haswell (but w/o PGO). Is this PGO specific? There's another > large jump visible end of 2019. It is between 2019-11-15 and 18 but the revisions does not exist at git - perhaps they reffer to the old git mirror. Martin will know better. In that range there are many of Richard's vectorizer changes and my patch fixing calculation of ref time in inliner which may be culprints. Honza