> I don't think the backwards/FSM threader tries to update the profile > data at all right now.
This seems to be cause of the regression andrew is speaking about. I wrote updating of profile after threading few times and there was also Theresa's patch. I tought all the threaders use common duplication engine and that one does the updating? I will try to dive into the code, but creating basic blocks with frequency 0 across hot paths is bad idea - they will be optimized for size. Honza
