(j3.2006) (SC22WG5.5141) [ukfortran] image selectors

[Van Snyder]

On Tue, 2013-12-10 at 14:41 -0600, Bill Long wrote:
> 
> On 12/10/13 2:01 PM, Van Snyder wrote:
> > I don't see how there are opportunities for optimization by not
> > specifying the mapping from parent team cosubscripts to subteam
> > subscripts.
> >
> 
> I would expect the optimization to be in the computation of the new 
> image index inside FORM TEAM.   If FORM TEAM is rarely executed in a 
> program (a reasonable expectation) this might not be that important.
> 
> Do you intend that, "if NEW_INDEX is not specified, the image index 
> values shall be in the same numerical order as in the parent team" 
> should be part of your ballot response?

That's one reasonable description.  It's a particularly easy one for
users to understand.  If, for example, one divides into odd and even
teams, calculating the parent's cosubscript from the subteam's
cosubscript is easy to do.

Any description is easier to understand and more useful than "processor
dependent."

> Cheers,
> Bill