Enable SSA at -O0

Richard Guenther rguenther@suse.de
Wed Jul 23 19:29:00 GMT 2008


On Wed, 23 Jul 2008, Richard Guenther wrote:

> On Wed, 23 Jul 2008, Mark Mitchell wrote:
> 
> > Richard Guenther wrote:
> > 
> > > > My biggest concern is that this may degrade debugging. We have
> > > > done quite a number on -O1 debuggability, and I am quite concerned
> > > > about this issue. if we can really be sure that there is zero or
> > > > positive impact on debugging and no other negatives, I have no
> > > > objection.
> > > 
> > > How can we be "really sure"? 
> > 
> > We can't be.  That's the point. :-)
> > 
> > Since we have a lot of risk-inducing things that we've already prioritized for
> > 4.4, and since time is short, I want to avoid adding another risk for this
> > release.
> 
> This is of course always the case with cleanups in infrastructure.  Which
> is why GCC keeps to be a crappy compiler ;)

Btw, this SSA at -O0 doesn't come out of a sudden.  See
http://gcc.gnu.org/ml/gcc/2008-02/msg00011.html

Richard.



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