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[Bug tree-optimization/33434] [4.3 Regression] inlining miscompilation



------- Comment #14 from razya at il dot ibm dot com  2007-10-30 09:14 -------
Subject: Re:  [4.3 Regression] inlining miscompilation

"rguenther at suse dot de" <gcc-bugzilla@gcc.gnu.org> wrote on 29/10/2007 
15:12:36:

> 
> 
> ------- Comment #13 from rguenther at suse dot de  2007-10-29 13:12 
-------
> Subject: Re:  [4.3 Regression] inlining
>  miscompilation
> 
> On Mon, 29 Oct 2007, razya at il dot ibm dot com wrote:
> 
> > > ------- Comment #11 from rguenther at suse dot de  2007-10-29 12:14 
> > -------
> > > Subject: Re:  [4.3 Regression] inlining
> > >  miscompilation
> > > 
> > > On Mon, 29 Oct 2007, razya at il dot ibm dot com wrote:
> > > 
> > > > ------- Comment #10 from razya at il dot ibm dot com  2007-10-29 
> > > 12:08 -------
> > > > (In reply to comment #6)
> > > > > Hmm, I have a question about IPA CP, should it call cfgcleanup 
> > > also?  It does
> > > > > not fix the problem here but it seems like a good idea.  I can 
> > > test a patch
> > > > > which adds the cfgcleanup if it is a good idea.
> > > > 
> > > > Hi Andrew
> > > > IPA CP iterates the whole callgraph, so do you mean cfgcleanup for 

> > each
> > > > function?
> > > 
> > > Only for the clones it propagated constants into.
> > > 
> > > Richard.
> > > 
> > 
> > IPA CP basically replaces the uses of the (always consatnt)parameter
> > with the constant.
> > This can be further folded by the ssa-cp pass on the cloned method. 
> > So I'm not sure how necessary it is to have a control flow cleanup
> > at this stage, but maybe I'm wrong...
> 
> Just because propagating the constants might result in
> 
>   if (0)
>     ...
> 
> which cfg_cleanup is able to remove (or if (1)).
> 
> Richard.
> 
> 

O.k, sure. 
Thanks.

> -- 
> 
> 
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33434
> 
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-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33434


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