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From: "jamborm at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/45791] Missed devirtualization Date: Wed, 15 Dec 2010 16:07:00 -0000 [thread overview] Message-ID: <bug-45791-4-gOF3tGZaII@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-45791-4@http.gcc.gnu.org/bugzilla/> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45791 --- Comment #14 from Martin Jambor <jamborm at gcc dot gnu.org> 2010-12-15 16:07:31 UTC --- (In reply to comment #9) > OK, main() code seems to optimize out that is an imrovement. Is it optimized > away with your patch pre-IPA too? Yes. Just before IPA, in fact. > > Derived() is also devirtualizable: > It could be done intraprocedurally if, unlike for automatically allocated decls, we considered all calls as potentially changing the dynamic type in unknown ways while doing the dynamic type change detection. This then however becomes essentially the same thing as devirtualization based on the constant folding, perhaps only more complicated. It could be optimized by IPA-CP if we can confirm that all callers are automatically allocated (or that we generally have them under control). This should be relatively easy, I will have a look at that. Mainly because we may be able to widen scope of objects under our control later.
next prev parent reply other threads:[~2010-12-15 16:07 UTC|newest] Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top 2010-09-25 17:28 [Bug tree-optimization/45791] New: " hubicka at gcc dot gnu.org 2010-09-25 19:50 ` [Bug tree-optimization/45791] " hubicka at gcc dot gnu.org 2010-09-26 3:33 ` hubicka at gcc dot gnu.org 2010-09-26 3:39 ` hubicka at gcc dot gnu.org 2010-09-26 6:02 ` hubicka at gcc dot gnu.org 2010-10-11 17:15 ` jamborm at gcc dot gnu.org 2010-10-11 18:40 ` jamborm at gcc dot gnu.org 2010-12-14 17:46 ` jamborm at gcc dot gnu.org 2010-12-14 23:15 ` hubicka at gcc dot gnu.org 2010-12-14 23:17 ` hubicka at gcc dot gnu.org 2010-12-14 23:35 ` jamborm at gcc dot gnu.org 2010-12-15 0:10 ` hubicka at gcc dot gnu.org 2010-12-15 0:13 ` hubicka at gcc dot gnu.org 2010-12-15 16:07 ` jamborm at gcc dot gnu.org [this message] 2014-02-24 9:44 ` matthijs at stdin dot nl 2014-09-25 20:29 ` hubicka at gcc dot gnu.org 2021-01-07 17:38 ` jamborm at gcc dot gnu.org
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