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Re: [PATCH] rebuild frequency after vrp


> 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
> 


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