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[Bug lto/45375] [meta-bug] Issues with building Mozilla with LTO
- From: "hubicka at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Thu, 20 Jan 2011 10:21:42 +0000
- Subject: [Bug lto/45375] [meta-bug] Issues with building Mozilla with LTO
- Auto-submitted: auto-generated
- References: <bug-45375-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45375
--- Comment #37 from Jan Hubicka <hubicka at gcc dot gnu.org> 2011-01-20 10:21:06 UTC ---
I tested Martin's devirtualization patch at cgraph build. The net result is
decrease of number of indirect calls in libxul by 2. The code size decrease by
about 3KB, so there is probably more devirtualization happening than just 2
calls but the subsequent inlining increase final number of virtual calls again.
So for 4.6.0 we won't seee more improvmeents and we can look into improving
devirtualization at 4.7. But having an testcases that can be resolved by other
compilers, but not by GCC is a must.