------- Comment #2 from spop at gcc dot gnu dot org 2007-04-29 16:21 ------- Subject: Re: Doesn't optimize the following (obvious) sequence
> PRE optimized the "offset" and "stride" variables. > SCEV doesn't know how to create an offset or step out of these optimized > operations. I remember another bug report like this one, and the solution was to tweak PRE not to peel linear sequences. > We used to at some point, but I believe these are "peeled_chrec's" > that we removed support for before merge. > Yes, I had another solution for transforming back the simple peeled chrecs to linear ones. > I think it's time we add back support for these chrec's. I can't block PRE > from optimizing these variables easily. > agreed, I'll send a patch for this. Sebastian -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31756
