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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/57359] wrong code for union access at -O3 on x86_64-linux
Date: Thu, 30 May 2013 07:13:00 -0000 [thread overview]
Message-ID: <bug-57359-4-dWPEv1GkjJ@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-57359-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57359
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jsm28 at gcc dot gnu.org
--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
I guess then the important question is what is supposed to be the effective
type of the object inside the union (ISO C99, 6.5/6), if it isn't the union,
but one of the types, then the testcase would be still invalid, because then
one or the other of the stores would be through non-allowed type (6.5/7).
If that wasn't invalid, it would be a loop-hole in TBAA disambiguation (because
then two stores through pointers with non-conflicting alias set couldn't be
just because of this considered non-aliasing.
next prev parent reply other threads:[~2013-05-30 7:13 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-05-21 18:20 [Bug rtl-optimization/57359] New: " dhazeghi at yahoo dot com
2013-05-21 18:26 ` [Bug rtl-optimization/57359] " pinskia at gcc dot gnu.org
2013-05-21 18:33 ` jakub at gcc dot gnu.org
2013-05-23 19:51 ` dhazeghi at yahoo dot com
2013-05-29 21:14 ` dhazeghi at yahoo dot com
2013-05-30 7:13 ` jakub at gcc dot gnu.org [this message]
2013-05-31 8:48 ` rguenth at gcc dot gnu.org
2013-05-31 16:32 ` dhazeghi at yahoo dot com
2013-05-31 21:07 ` joseph at codesourcery dot com
2013-06-03 19:15 ` dhazeghi at yahoo dot com
2013-06-04 12:37 ` [Bug tree-optimization/57359] " rguenth at gcc dot gnu.org
2020-04-20 7:15 ` [Bug tree-optimization/57359] store motion causes wrong code for union access at -O3 rguenth at gcc dot gnu.org
2020-04-20 8:57 ` rguenth at gcc dot gnu.org
2020-04-20 10:50 ` rguenth at gcc dot gnu.org
2020-04-20 12:03 ` rguenth at gcc dot gnu.org
2020-04-20 12:34 ` pascal_cuoq at hotmail dot com
2020-04-20 12:39 ` rguenther at suse dot de
2020-04-21 7:22 ` rguenth at gcc dot gnu.org
2020-04-27 9:17 ` rguenth at gcc dot gnu.org
2020-04-27 9:35 ` rguenth at gcc dot gnu.org
2020-04-27 12:48 ` rguenth at gcc dot gnu.org
2020-04-30 12:25 ` rguenth at gcc dot gnu.org
2020-05-07 10:12 ` cvs-commit at gcc dot gnu.org
2020-05-07 10:13 ` rguenth at gcc dot gnu.org
2020-05-11 12:56 ` rguenth at gcc dot gnu.org
2020-05-11 12:56 ` rguenth at gcc dot gnu.org
2020-05-11 14:53 ` rguenth at gcc dot gnu.org
2020-05-11 14:57 ` rguenth at gcc dot gnu.org
2020-05-12 6:26 ` rguenth at gcc dot gnu.org
2020-05-12 11:53 ` ro at gcc dot gnu.org
2020-05-12 12:13 ` rguenth at gcc dot gnu.org
2020-05-18 9:50 ` rguenth at gcc dot gnu.org
2020-06-11 15:55 ` pinskia at gcc dot gnu.org
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