[PATCH][4.1] Fix PR26763

[Richard Guenther]

On Tue, 4 Apr 2006, Roger Sayle wrote:

> 
> On Mon, 3 Apr 2006, Richard Guenther wrote:
> > 2006-04-03  Richard Guenther  <rguenther@suse.de>
> >
> > 	PR tree-optimization/26763
> > 	* fold-const.c (fold_binary): Fold PTR + CST CMP PTR + CST
> > 	only for EQ_EXPR and NE_EXPR.
> >
> > 	* gcc.dg/torture/pr26763-1.c: New testcase.
> > 	* gcc.dg/torture/pr26763-2.c: Likewise.
> 
> And this version is OK for the gcc-4_1-branch.  Let's keep an
> eye open for possible performance issues.  This fix is fine as
> this is a serious wrong-code regression, but if it costs a lot
> in performance, we'll need to investigate (prioritize) a longer
> term solution to recover these optimizations.

We now have PR27039.  But I really have no idea what to do here.

Richard.