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From: "siddhesh at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/109557] __builtin_dynamic_object_size() does not work for simple testing case
Date: Wed, 19 Apr 2023 16:36:18 +0000 [thread overview]
Message-ID: <bug-109557-4-kkAsy3YiNm@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-109557-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109557
--- Comment #2 from Siddhesh Poyarekar <siddhesh at gcc dot gnu.org> ---
(In reply to qinzhao from comment #0)
> I am wondering for
> p.3_1 = p;
> _2 = __builtin_object_size (p.3_1, 0);
>
> why the size of p.3_1 cannot use the TYPE_SIZE of the pointee of p when its
> size can be determined (i.e, not a structure with a flexible array member,
> etc)?
To answer this specific question, it's because the compiler can't see in main()
if p is pointing to any actual storage.
next prev parent reply other threads:[~2023-04-19 16:36 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-04-19 16:21 [Bug middle-end/109557] New: " qinzhao at gcc dot gnu.org
2023-04-19 16:34 ` [Bug middle-end/109557] " siddhesh at gcc dot gnu.org
2023-04-19 16:36 ` siddhesh at gcc dot gnu.org [this message]
2023-04-19 16:38 ` muecker at gwdg dot de
2023-04-19 16:50 ` siddhesh at gcc dot gnu.org
2023-04-19 16:56 ` muecker at gwdg dot de
2023-04-19 17:00 ` siddhesh at gcc dot gnu.org
2023-04-19 18:23 ` qinzhao at gcc dot gnu.org
2023-07-17 20:42 ` qinzhao at gcc dot gnu.org
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