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From: "ubizjak at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/111165] [13 regression] builtin strchr miscompiles on Debian/x32 with dietlibc
Date: Mon, 28 Aug 2023 15:26:23 +0000	[thread overview]
Message-ID: <bug-111165-4-MGvOCEKas5@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-111165-4@http.gcc.gnu.org/bugzilla/>

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111165

Uroš Bizjak <ubizjak at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |hjl.tools at gmail dot com

--- Comment #14 from Uroš Bizjak <ubizjak at gmail dot com> ---
(In reply to Thorsten Glaser from comment #13)
> The interesting part is around the occurrence of…
> 
> # eval.c:399:                           sp = cstrchr(sp, '\0') + 1;
> 
> … in the .s files (it occurs thrice, the first is the beginning of the setup
> part, the second and third surround the strlen call, so they’re all within a
> bunch of lines).

Unfortunately, the runtime bug requires test that fails at runtime; the
attached dumps are not that usable. The fact that the compiler fails for not so
common target makes things even harder.

I think that the best way forward is to create a minimized standalone testcase
(From Comment #11 it looks that the issue is independent of dietlibc) that can
be compiled with -mx32 in a kind of cross-compiler fashion. You can use
-maddress-mode=long with -mx32 to create a .s assembly file that is compatible
with x86_64, as far as stack handling is concerned.

The resulting .s assembly can then be compiled and linked with a C wrapper, so
a testcase that eventually fails on x86_64 can be produced.

IOW, does the testcase fail when -maddress-mode=long is used?

  parent reply	other threads:[~2023-08-28 15:26 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-08-26 18:17 [Bug target/111165] New: " tg at mirbsd dot org
2023-08-26 18:20 ` [Bug target/111165] " pinskia at gcc dot gnu.org
2023-08-26 18:21 ` pinskia at gcc dot gnu.org
2023-08-26 19:36 ` tg at mirbsd dot org
2023-08-26 20:03 ` tg at mirbsd dot org
2023-08-26 20:21 ` tg at mirbsd dot org
2023-08-26 20:49 ` tg at mirbsd dot org
2023-08-26 21:18 ` tg at mirbsd dot org
2023-08-28  7:25 ` rguenth at gcc dot gnu.org
2023-08-28 14:22 ` tg at mirbsd dot org
2023-08-28 14:41 ` tg at mirbsd dot org
2023-08-28 14:46 ` tg at mirbsd dot org
2023-08-28 14:57 ` tg at mirbsd dot org
2023-08-28 15:02 ` tg at mirbsd dot org
2023-08-28 15:26 ` ubizjak at gmail dot com [this message]
2023-08-28 15:44 ` hjl.tools at gmail dot com
2023-08-28 16:08 ` tg at mirbsd dot org
2023-08-28 16:09 ` tg at mirbsd dot org
2023-08-28 16:38 ` tg at mirbsd dot org
2024-05-21  9:16 ` jakub at gcc dot gnu.org

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