Re: Fix tree-optimization/17273

[Daniel Berlin <dberlin at dberlin dot org>]

On Fri, 17 Sep 2004, Diego Novillo wrote:

> On Fri, 2004-09-17 at 14:47, Andrew Pinski wrote:
>
> > I don't like we are working around a bug because it is considered too
> > late/invasive for 4.0, remember we are early into stage3 which means
> > that we can have invasive stuff iff it fixes bugs.
> I don't like it either, but c'est la vie.
>
> The work I'm doing is still largely experimental.  It lengthens the
> optimization pipeline quite significantly and has us calling
> execute_ssa_ccp() and execute_copy_prop() very often.  They become
> global entry points for any pass that needs to clean things up.  So,
> they have to be _fast_.

BTW, one trivial improvement to CCP you should have on your list to make 
it faster is to add the cfg blocks in dominator tree order.

I did this for pointer alignment analysis on the lno-branch, it was 
roughly a 10 line change, IIRC.

(I still have to move pointer alignment analysis to use the generic value 
propagation engine, but that's another matter).