[m-rev.] diff/for review: last call modulo construction

[Peter Ross]

On Mon, Sep 12, 2005 at 02:50:08PM +1000, Zoltan Somogyi wrote:
> We have been missing this optimization for a long time. Now we ought to
> get significantly better results on some standard benchmarks such as
> naive reverse. However, the impact on the compiler performance in general
> is not as good. My preliminary benchmarking shows that the new optimization
> gives a 2% speedup at -O2, but slowdowns at higher optimization levels.
> This must be due to an unfavourable interaction with some other optimization.
> I will look into this later.
> 
PS I thought one couldn't do this optimization without the aliasing
information.  Why can we do it now?
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