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From: "falk at debian dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/32856] Invalid optimization in the face of aliasing
Date: Mon, 23 Jul 2007 14:17:00 -0000 [thread overview]
Message-ID: <20070723141728.4334.qmail@sourceware.org> (raw)
In-Reply-To: <bug-32856-3511@http.gcc.gnu.org/bugzilla/>
------- Comment #7 from falk at debian dot org 2007-07-23 14:17 -------
(In reply to comment #6)
> This program demonstrates the problem, it creates different output depending on
> if compiled with or without optimisation.
This does not demonstrate the problem, since your code has undefined behavior
(already c = ... is undefined). You really need something like the union
mentioned earlier.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32856
next prev parent reply other threads:[~2007-07-23 14:17 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-07-22 17:06 [Bug c/32856] New: " felix-gcc at fefe dot de
2007-07-22 17:09 ` [Bug c/32856] " felix-gcc at fefe dot de
2007-07-22 17:12 ` felix-gcc at fefe dot de
2007-07-22 19:27 ` [Bug middle-end/32856] " pinskia at gcc dot gnu dot org
2007-07-22 23:01 ` falk at debian dot org
2007-07-22 23:08 ` felix-gcc at fefe dot de
2007-07-22 23:19 ` falk at debian dot org
2007-07-23 10:09 ` vogel at pi2 dot physik dot uni-erlangen dot de
2007-07-23 14:17 ` falk at debian dot org [this message]
2007-07-24 12:09 ` rguenth at gcc dot gnu dot org
2007-07-25 8:24 ` falk at debian dot org
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