------- Additional Comments From sebastian dot pop at cri dot ensmp dot fr 2005-01-25 16:26 ------- Subject: Re: [4.0 Regression] IV-OPTS is O(N^3)
> > If you decide to reconstruct the tree expression, there is no reason > > to stop on a phi node that has a single argument. Why would you like > > to get this answer as the reconstructed tree? > > because this answer preserves loop closed ssa form -- the answer x_1 + 1 > copy propagates the value outsied of the loop. In some applications > this choice could make sense. > Okay, if it makes sense, you could modify the analyzer such that it stops reconstructing the tree once it is on the phi following a loop. This won't change the information provided after the instantiation. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18595
