[Bug tree-optimization/64193] [4.8/4.9/5 Regression] Decreased performance after r173250

[rguenther at suse dot de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64193

--- Comment #6 from rguenther at suse dot de <rguenther at suse dot de> ---
On Tue, 9 Dec 2014, cederman at gaisler dot com wrote:

> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64193
> 
> --- Comment #5 from Daniel Cederman <cederman at gaisler dot com> ---
> > Probably the regression was mitigated by the partial fix for PR63677:
> 
> Yes, that seems to be the case for my attached example. Do you think that the
> regression is mitigated in general, or is your attached fix also needed?

I am testing my fix and will install it nevertheless - it is required
to get full optimistic value-numbering again.  It would be also the
fix that is appropriate for backporting (if any of them is).