From: Jon Masters <jonathan@jonmasters.org>
To: paulmck@linux.vnet.ibm.com
Cc: tony.luck@intel.com, peterz@infradead.org, linux-kernel@vger.kernel.org
Subject: Re: Does Itanium permit speculative stores?
Date: Tue, 26 Nov 2013 23:55:58 -0500 [thread overview]
Message-ID: <52957B5E.60701@jonmasters.org> (raw)
In-Reply-To: <20131111171307.GA27002@linux.vnet.ibm.com>
On 11/11/2013 12:13 PM, Paul E. McKenney wrote:
> Hello, Tony,
>
> Does Itanium permit speculative stores? For example, on Itanium what are
> the permitted outcomes of the following litmus test, where both x and y
> are initially zero?
>
> CPU 0 CPU 1
>
> r1 = ACCESS_ONCE(x); r2 = ACCESS_ONCE(y);
> if (r1) if (r2)
> ACCESS_ONCE(y) = 1; ACCESS_ONCE(x) = 1;
>
> In particular, is the outcome (r1 == 1 && r2 == 1) possible on Itanium
> given this litmus test?
>
> Thanx, Paul
>
> --
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>
Btw, I was reading through some UEFI docs and noticed a reference to "A
Formal Specification of Intel Itanium Processor Family Memory Ordering",
then remembered this thread. In case it's of use:
http://www.intel.com/design/itanium/downloads/251429.htm
Jon.
next prev parent reply other threads:[~2013-11-27 5:24 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-11-11 17:13 Does Itanium permit speculative stores? Paul E. McKenney
2013-11-12 18:00 ` Luck, Tony
2013-11-12 18:26 ` Peter Zijlstra
2013-11-12 18:46 ` Luck, Tony
2013-11-12 18:49 ` Peter Zijlstra
2013-11-12 21:29 ` Paul E. McKenney
2013-11-12 21:30 ` Paul E. McKenney
2013-11-12 18:31 ` Paul E. McKenney
2013-11-12 18:34 ` Peter Zijlstra
2013-11-27 4:55 ` Jon Masters [this message]
2013-11-27 17:19 ` Paul E. McKenney
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