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From: "rcopley at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/54412] Request for 32-byte stack alignment with -mavx on Windows
Date: Tue, 10 Sep 2013 17:49:00 -0000	[thread overview]
Message-ID: <bug-54412-4-VQ2cEjHWgW@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-54412-4@http.gcc.gnu.org/bugzilla/>

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54412

--- Comment #4 from R Copley <rcopley at gmail dot com> ---
(In reply to Kai Tietz from comment #1)
> MS' abi doesn't allow this.  So I doubt we will be able to implement that
> for this target.  If we want to re-align stack on function-base we will run
> into troubles with SEH-information.

You might be right, I'm not sure. Are you aware that on 64-bit Windows, SEH is
table-based, not frame-based (see, e.g.,
http://www.osronline.com/article.cfm?article=469)?

> Doesn't it work to align explicit the variable itself?

No (see attachments 2 and 3). If I understand correctly, the alignment
specification is redundant anyway, because the variables are supposed to be
naturally aligned, on their size.

Assembling attachment 3 with "-g" and running it in gdb gives:

Program received signal SIGSEGV, Segmentation fault.
main () at bug1.s:46
46              vmovapd %ymm0, -96(%rbp)

Thanks.


  parent reply	other threads:[~2013-09-10 17:49 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-08-30  1:10 [Bug target/54412] New: " rcopley at gmail dot com
2013-09-10 10:30 ` [Bug target/54412] " ktietz at gcc dot gnu.org
2013-09-10 17:26 ` rcopley at gmail dot com
2013-09-10 17:49 ` rcopley at gmail dot com [this message]
2014-09-03 21:17 ` roland at rschulz dot eu
2014-09-04 22:49 ` rcopley at gmail dot com
2014-09-05  1:42 ` roland at rschulz dot eu
2014-09-05 18:40 ` rcopley at gmail dot com
2014-09-05 18:44 ` rcopley at gmail dot com
2014-09-21  1:08 ` rcopley at gmail dot com
2015-09-22 10:51 ` ktietz at gcc dot gnu.org
2021-08-23  3:12 ` [Bug target/54412] minimal 32-byte stack alignment with -mavx on 64-bit Windows arthur200126 at gmail dot com
2021-08-25  5:38 ` dimula73 at gmail dot com
2021-09-26  7:15 ` mehdi.chinoune at hotmail dot com
2022-04-01 15:01 ` lists at coryfields dot com
2022-04-01 15:38 ` ebotcazou at gcc dot gnu.org
2022-04-01 16:27 ` steve at sk2 dot org
2022-04-01 17:59 ` jakub at gcc dot gnu.org
2022-04-01 20:25 ` ebotcazou at gcc dot gnu.org
2022-04-01 20:50 ` rcopley at gmail dot com
2022-04-01 21:00 ` ebotcazou at gcc dot gnu.org
2022-04-20 14:41 ` hjl.tools at gmail dot com
2024-01-09 10:15 ` ebotcazou at gcc dot gnu.org
2024-03-26 15:12 ` avraham.adler at gmail dot com
2024-03-27 17:42 ` dimula73 at gmail dot com
2024-03-28 17:30 ` avraham.adler at gmail dot com
2024-03-28 20:26 ` ebotcazou at gcc dot gnu.org

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