Loop optimizer issues

[tm_gccmail@mail.kloo.net]

On Tue, 29 Jul 2003, Zdenek Dvorak wrote:

> Hello,
> 
> > > I've been thinking about this proposal and I am not convinced that it
> > > would be a good idea to merge the two branches.
> > > 
> > >       * The tree-ssa branch is primarily trying to replace RTL passes. 
> > >         This may include the loop optimizer.  So far, it is not clear
> > >         whether we will actually need to have a sophisticated loop
> > >         optimizer at the RTL level (if at all).  The only thing that
> > >         comes to mind that may needed from RTL are:
> > >               * instruction lengths/costs to guide the unroller
> > >               * prefetching capabilities and memory costs to guide
> > >                 software pipelining and memory hierarchy optimizations.
> > 
> > We do BIV-to-GIV conversion and some addressing mode selection in the RTL
> > loop optimizer. This is critical for targets such as the SH.
> 
> this is done by the new rtl-level optimizer.  The support probably is
> not flawless, but if you encounter some problems and provide me with
> more details, I am fairly confident I am able to fix them quickly.
> 
> Zdenek

Look slike rtlopt-branch has problems for the SH:

dbmatch.i: In function `DBSetupGarbageObject':
dbmatch.i:4590: internal compiler error: Segmentation fault

I'll file a bug report.

Toshi