[Bug middle-end/56727] Recursive call goes through the PLT unnecessarily

["tetra2005 at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56727

--- Comment #12 from Yuri Gribov <tetra2005 at gmail dot com> ---
(In reply to Jakub Jelinek from comment #10)
> (In reply to Yuri Gribov from comment #9)
> > (In reply to Alexander Monakov from comment #8)
> > > Well, if my argument is correct, then GCC generates wrong code for the very
> > > first example in comment #0.
> > 
> > I believe it does (see my #5, most probly author of some pass failed to
> > check for interposition).  Note that simple recursive factorial is expanded
> > to loop too which is a more impressive instance of this bug.
> > 
> > > To my knowledge, that
> > > is the sole instance where optimization doesn't fully honor ELF
> > > interposition possibility.
> > 
> > +1
> 
> Don't we also inline any beneficial inline functions at -O3 even if they
> could be interposed (definitely not suggesting we stop doing that, that
> would totally kill compiler performance)?

Inlining inline functions is fine due to ODR rule.