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Re: [Bug middle-end/35560] Missing CSE/PRE for memory operations involved in virtual call.
- From: Andrew Thomas Pinski <pinskia at gmail dot com>
- To: "gcc-bugzilla at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- Cc: "gcc-bugs at gcc dot gnu dot org" <gcc-bugs at gcc dot gnu dot org>
- Date: Sun, 30 Nov 2008 11:27:46 -0800
- Subject: Re: [Bug middle-end/35560] Missing CSE/PRE for memory operations involved in virtual call.
- References: <bug-35560-9436@http.gcc.gnu.org/bugzilla/> <20081130120920.25729.qmail@sourceware.org>
I think this bug is invalid since the type can change via a placement
new which will change the vtable.
Sent from my iPhone
On Nov 30, 2008, at 4:09 AM, "rguenth at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org
> wrote:
------- Comment #3 from rguenth at gcc dot gnu dot org 2008-11-30
12:09 -------
Note that we also do not CSE OBJ_TYPE_REF trees which seem to be
valid gimple
in place of the call in GIMPLE_CALLs so they do not get a separate
value-number.
(not that we would do anything useful with them if they were
standalone,
testcase for that welcome)
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35560