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Re: Speculative call support in the callgraph


On Sat, Aug 10, 2013 at 02:25:21AM +0200, Andi Kleen wrote:
> On Sat, Aug 10, 2013 at 01:15:11AM +0200, Jan Hubicka wrote:
> > > Jan Hubicka <hubicka@ucw.cz> writes:
> > > 
> > > > Hi,
> > > > this patch adds support for speculative calls into callgraph.  The idea is that
> > > > any IPA optimization that believes it knows likely target of an indirect call
> > > > (currently I use it for cross-module indirect call profiling, but I expect
> > > > Martin J. can easily add support for ipa-cp and I hope to add speculative
> > > > devirtualization in foreseeable future since it should make difference for
> > > > Firefox). Speculative call replaces indirect call
> > > 
> > > Patch appears to break boot strap on x86_64-linux 
> > > (or maybe your other one)
> > 
> > How do you bootstrap? This should not be used w/o lto+profiledbootstrap and
> > that seems to work for me...
> 
> Neither LTO nor profiled

My tree bootstraps again when I revert

 * cgraphbuild.c (cgraph_rebuild_references): Rebuild only
 * non-speculative
   refs.
 * cgraph.c (cgraph_update_edge_in_call_site_hash): New
		 * function.

svn+ssh://gcc.gnu.org/svn/gcc/trunk@201632

(and also the later patch)

-Andi


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