[cpp-threads] A question about N2153

[Raul Silvera]

Yes. I think that anything else couldn't really be called ordered.
On PPC, it would require a leading sync and a trailing lwsync.

In most cases, the useful variant is the acquire RMW, which will be just a
trailing isync.

--
Raúl E. Silvera         IBM Toronto Lab   Team Lead, Toronto Portable
Optimizer (TPO)
Tel: 905-413-4188 T/L: 969-4188           Fax: 905-413-4854
D2/KC9/8200/MKM


cpp-threads-bounces at decadentplace.org.uk wrote on 01/23/2007 07:25:36 AM:

> On 1/23/07, Raul Silvera <rauls at ca.ibm.com> wrote:
> > As per the definitions in N2153, an ordered RMW has the acquire and
release
> > orderings apply to both the load and store implied by the operation.
>
> Do you really want to impose no less than sync on both sides of LR-SC
> on Power (leading lwsync + trailing isync won't do it)?
>
> regards,
> alexander.
>
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