http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38474
--- Comment #64 from Martin Jambor <jamborm at gcc dot gnu.org> 2012-06-26 15:01:28 UTC --- (In reply to comment #62) > (In reply to comment #61) > > (In reply to comment #57) > > > > Anyway, on the machine where are debugged this, compilation at -O3 > > took over 16 seconds which dropped to about 13.5 seconds when I also > > What? Must be a future machine. On everything I have access to the reduced > testcase (6309 lines) takes about 800 to 1000 seconds. Do you build without > any checking? Minutes! Of course I meant minutes, the drop is thus from ~1000 seconds to ~810 seconds. I forgot I was using bash time instead of /usr/bin/time -f%U which I was regularly using only a few days ago. > > In any case, the proposed patch does reduce the time to basically nothing for > the alias tree walker, so: thanks :) I've experimentally disabled the walker in is_parm_modified_before_stmt and am now waiting for results but I guess it won't have any measurable impact.
