[PING] Loop-optimizer patches

[Zdenek Dvorak]

Hello,

> > > All these older patches are by Zdenek, but if approved I could take care
> > > of redoing bootstraps and regtests, and applying them:
> > >
> > > http://gcc.gnu.org/ml/gcc-patches/2005-03/msg01611.html
> > > merging of equivalent invariants in rtl level invariant motion
> >
> > there is a minor bug in this version that I found during later tests,
> > I will try to prepare the fixed version soon.
> >
> > > http://gcc.gnu.org/ml/gcc-patches/2005-03/msg02577.html
> > > reenables loop header predictor
> >
> > We have agreed with Honza that a better way is to move loop header
> > copying after the profiling pass, I will try to do this soon as well
> > (taking into account that I have about 5 patches I need to work
> > on in the queue now, "soon" may take some time :-( )  There already is some
> > profile updating code in tree-ssa-loop-ch, so it only needs to be
> > checked that it behaves sanely, and to run some benchmark to verify that
> > the pass reordering does not generate any unexpected regressions.
> 
> Even with loop header copying after profiling, this patch to re-enable
> the predictor is still necessary.  Pat Haugen from IBM has an example
> where this predictor is necessary to get one of his bb-reorder fix to
> work.

could you send me the test?  This is impossible, therefore this is a bug
in profile updating code in loop header copying.

Zdenek