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From: Will Newton <>
To: Andrew Haley <>
Cc: "Carlos O'Donell" <>,
		"" <>,
	Patch Tracking <>
Subject: Re: [PATCH] ARM: Add pointer guard support.
Date: Wed, 25 Sep 2013 19:32:00 -0000	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

On 25 September 2013 17:59, Andrew Haley <> 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

  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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