[m-dev.] for review: constraint propagation

[Fergus Henderson]

On 29-Feb-2000, Simon Taylor <stayl at cs.mu.OZ.AU> wrote:
> 
> > Does the compiler bootstrap and pass its tests
> > with constraint propagation enabled?
> 
> It does.
> 
> > If so, then you should enable constraint propagation
> > at one of the `-O' levels, e.g. -O3 or -O4.
> 
> I'd rather not. While the optimization has little effect on the
> code size of the compiler, I don't think it is controlled well
> enough to be applied to arbitrary programs.

OK.  In that case it would be worth mentioning in the documentation
for `-O' that there are some optimizations which are not applied by
default at any optimization level, and to list them.

-- 
Fergus Henderson <fjh at cs.mu.oz.au>  |  "I have always known that the pursuit
The University of Melbourne         |  of excellence is a lethal habit"
WWW: <http://www.cs.mu.oz.au/~fjh>  |     -- the last words of T. S. Garp.
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