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From: "torvalds@linux-foundation.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/113921] Output register of an "asm volatile goto" is incorrectly clobbered/discarded
Date: Wed, 14 Feb 2024 18:13:02 +0000	[thread overview]
Message-ID: <bug-113921-4-hDwQO1GoHY@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-113921-4@http.gcc.gnu.org/bugzilla/>

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113921

--- Comment #2 from Linus Torvalds <torvalds@linux-foundation.org> ---
(In reply to Jakub Jelinek from comment #1)
> Bisection points to r12-5301-g045206450386bcd774db3bde0c696828402361c6
> making the problem go away,

Well, that certainly explains why I can't see the problem with my gcc 13.2.1.

It looks like that commit is in gcc-12.1.o and later:

   git log --oneline --all --grep="tree-optimization/102880 - improve CD-DCE"

only returns that one commit, and 

   git name-rev --refs '*releases*' 045206450386b

says "gcc-12.1.0~3038".

So we could make our workaround option be something like

   config GCC_ASM_GOTO_WORKAROUND
     def_bool y
     depends on CC_IS_GCC && GCC_VERSION < 120100

but maybe there is some backporting policy with gcc that my quick git check
missed?

  parent reply	other threads:[~2024-02-14 18:13 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-02-14 17:19 [Bug c/113921] New: " seanjc at google dot com
2024-02-14 18:00 ` [Bug middle-end/113921] " jakub at gcc dot gnu.org
2024-02-14 18:13 ` torvalds@linux-foundation.org [this message]
2024-02-14 18:16 ` torvalds@linux-foundation.org
2024-02-14 18:21 ` jakub at gcc dot gnu.org
2024-02-14 18:25 ` torvalds@linux-foundation.org
2024-02-14 18:40 ` jakub at gcc dot gnu.org
2024-02-14 19:07 ` jakub at gcc dot gnu.org
2024-02-14 20:31 ` jakub at gcc dot gnu.org
2024-02-15  8:00 ` rguenth at gcc dot gnu.org
2024-02-15  8:21 ` jakub at gcc dot gnu.org
2024-02-15 14:56 ` cvs-commit at gcc dot gnu.org
2024-02-15 15:14 ` cvs-commit at gcc dot gnu.org
2024-02-15 15:17 ` cvs-commit at gcc dot gnu.org
2024-02-15 15:20 ` cvs-commit at gcc dot gnu.org
2024-02-15 15:22 ` jakub at gcc dot gnu.org

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