Hi --
I am not an expert on iterators, but many of the other Chapel group members are
busy preparing for http://chapel.cray.com/CHIUW2017.html, so I’ll have a go at
a response and if it needs improving surely someone else will help.
Are you talking about removing the if-stmt in these() and replacing it with the
body of the else-branch? Yes, conceptually this would be equivalent, but we’d
end up with the iterator in these() re-yielding what the iterator in
these_help() yielded, and my guess is that our iterator inlining isn’t quite
good enough to remove all the overhead in this case. So to optimize the common
case, we handle rank==1 specially in these().
greg
On May 29, 2017, at 12:38 AM, Tomsy Paul
<[email protected]<mailto:[email protected]>> wrote:
Dear all,
I have a doubt regarding 'these' and 'these_help' iterators (line 181 and 151
respectively) in class DefaultRectangularDom of DefaultRectangular.chpl.
'these' yields directly for rank == 1 and calls 'these_help' otherwise. Now in
the latter, the condition rank == d is checked at the beginning. So can't we
avoid the condition rank == 1 in 'these' and directly call 'these_help(rank)' ?
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