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SubjectRe: Does Itanium permit speculative stores?
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.



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