[PATCH] Fix PR26406, forwprop causing VRP to fail

[Jeffrey A Law]

On Wed, 2006-02-22 at 14:07 +0100, Richard Guenther wrote:
> This fixes the testcase by only propagating single-use variables into
> conditionals.
> 
> Bootstrapped and tested on x86_64-unknown-linux-gnu.
> 
> Ok for mainline?
> 
> Thanks,
> Richard.
> 
> 
> :ADDPATCH tree-optimization:
> 
> 2006-02-22  Richard Guenther  <rguenther@suse.de>
> 
> 	PR tree-optimization/26406
> 	* tree-ssa-forwprop.c (find_equivalent_equality_comparison):
> 	Only use single-use conversions to simplify conditionals.
> 
> 	* g++.dg/tree-ssa/pr26406.C: New testcase.
No.  We don't want to restrict things in this way.  I'm pretty
sure there's a better way to handle this.  Please be patient as
I'm more focused on the compilation regressions right now rather
than the minor optimization regressions.

jeff