From: Nick Desaulniers <ndesaulniers@google.com>
To: Andi Kleen <ak@linux.intel.com>
Cc: Florian Weimer <fweimer@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
LKML <linux-kernel@vger.kernel.org>,
Andi Kleen <andi@firstfloor.org>,
linux-toolchains@vger.kernel.org
Subject: Re: [PATCH] sched: Work around undefined behavior in sched class checking
Date: Wed, 5 May 2021 09:41:09 -0700 [thread overview]
Message-ID: <CAKwvOdneTkwm1xmte2SxwR=pcp3vi320kQuQHtVNVbnqLbcP3Q@mail.gmail.com> (raw)
In-Reply-To: <20210505143916.GS4032392@tassilo.jf.intel.com>
On Wed, May 5, 2021 at 7:39 AM Andi Kleen <ak@linux.intel.com> wrote:
>
> > Would you please provide a
> > minimal test case?
>
> You can only reproduce it with a LTO build because it needs knowledge
> between different translation units for this specific case.
>
> But gcc will totally do the optimization even without LTO if it can
> prove the same inside a single TU.
It would be helpful to isolate a test case that doesn't rely on LTO,
if possible.
--
Thanks,
~Nick Desaulniers
next prev parent reply other threads:[~2021-05-05 17:27 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20210505033945.1282851-1-ak@linux.intel.com>
2021-05-05 6:46 ` [PATCH] sched: Work around undefined behavior in sched class checking Peter Zijlstra
2021-05-05 8:47 ` Florian Weimer
2021-05-05 9:04 ` Peter Zijlstra
2021-05-05 14:39 ` Andi Kleen
2021-05-05 16:41 ` Nick Desaulniers [this message]
2021-05-05 16:48 ` Andi Kleen
2021-05-05 17:08 ` Nick Desaulniers
2021-05-05 17:20 ` Andi Kleen
2021-05-05 14:34 ` Andi Kleen
2021-05-05 15:34 ` Peter Zijlstra
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