> On 06/02/14 12:07, Jan Hubicka wrote: > > > >It is one of reasions why I think it would be cool to do jump threading in > >early opts, too, at least in a lightweidt form. > Conceptually it's pretty easy to do during the into-ssa step. Not > sure it it'd catch the cases you care about though.
Yep, it may be an option, too. I always had in mind Muchnick style cheap DOM pass run during into-SSA or as very first cleanup to get rid of unnecesary code quickly and cheaply. Our DOM is bit different beast though :). Very basic jump threading may fit here - never really tought about that. You probably know better than me how many of threading oppurtunities are "obvious" and how many are the difficult ones solved by VRP&DOM. My gut feeling is that doing the obvious ones may be good enough. But I do not know. Honza > > jeff >
