From: Will Newton <will.newton@linaro.org>
To: Andrew Haley <aph@redhat.com>
Cc: "Carlos O'Donell" <carlos@redhat.com>,
"libc-ports@sourceware.org" <libc-ports@sourceware.org>,
Patch Tracking <patches@linaro.org>
Subject: Re: [PATCH] ARM: Add pointer guard support.
Date: Wed, 25 Sep 2013 19:32:00 -0000 [thread overview]
Message-ID: <CANu=DmhKf7u=L4f9ggcOuSQYBvm61L9gA5=Jvqxg+WMNDSHKnA@mail.gmail.com> (raw)
In-Reply-To: <5243165F.804@redhat.com>
On 25 September 2013 17:59, Andrew Haley <aph@redhat.com> wrote:
> On 09/25/2013 05:23 PM, Will Newton wrote:
>> From a back of the envelope calculation the cost of accessing TLS is
>> one cycle faster than accessing a global in best case (e.g.
>> Cortex-A15)
>
> Why is TLS so fast on Cortex-A15?
I don't have exact numbers but the mrc instruction used to load the
thread pointer into a general purpose register has very variable
timings depending on which core you have. A15 is the fastest of the
Cortex-A cores in this regard.
--
Will Newton
Toolchain Working Group, Linaro
next prev parent reply other threads:[~2013-09-25 19:32 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-09-25 9:06 Will Newton
2013-09-25 16:09 ` Carlos O'Donell
2013-09-25 16:20 ` pinskia
2013-09-25 16:23 ` Will Newton
2013-09-25 16:25 ` Carlos O'Donell
2013-09-25 16:59 ` Andrew Haley
2013-09-25 19:32 ` Will Newton [this message]
2013-09-26 15:02 ` Carlos O'Donell
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