Belatedly: Another potential direction to take this would be to consider
whether leaning on tuples harder would help out. E.g., what if the
examples were:
forall i in 1..10 with (in (x, y), + reduce (sum1, sum2))) do ...
I shy away from this slightly due to knowing that our specification and
implementation of tuples has historically had some holes, but maybe that's
just something I need to shake if this makes sense and is attractive.
-Brad
On Tue, 28 Feb 2017, Nicholas Park wrote:
> Hi Nikhil,
>
> I think this would be a nice simplification, and I'd suggest expanding it
> to all task intents; e.g.,
>
>> var x = 42, y = 29;
>>
> forall i in 1..10 with (in x, y) { // instead of (in x, in y)
>>
> x += 2*i;
>>
> y += 3*i;
>>
> }
>>
>
> I think the programmer's intent (no pun intended) is still clear in this
> syntax.
>
> Thanks,
>
> Nick
>
> On Mon, Feb 27, 2017 at 5:42 PM, Nikhil Padmanabhan <
> [email protected]> wrote:
>
>> Dear chapel-developers,
>>
>> I often find myself doing multiple reductions of the same type in forall
>> loops (eg. multiple accumulators). The way I currently do this is to
>> specify separate reduce intents (as in the commented line in the code
>> below....)
>> (+ reduce sum1, + reduce sum2)
>>
>> While this works fine, it would be nice to write this as
>>
>> (+ reduce sum1,sum2)
>>
>> or something like that (with a different delimiter, for instance).
>>
>> I'll note that OpenMP allows specifying such common reductions over a list
>> of variables.
>>
>> Any thoughts?
>>
>> Thanks in advance,
>> -- Nikhil
>>
>> ------------------------------------------------
>>
>> var sum1, sum2 = 0;
>>
>> config const N=100000;
>>
>> forall ii in 1..N with (+ reduce sum1,sum2) {
>> //forall ii in 1..N with (+ reduce sum1, + reduce sum2) {
>> sum1 += ii;
>> sum2 += ii*ii;
>> }
>>
>> writeln(sum1);
>> writeln(sum2);
>>
>>
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