[pooma-dev] Evaluator/ReductionEvaluator.h question

[Richard Guenther]

On Fri, 21 Feb 2003, Richard Guenther wrote:

> On Fri, 21 Feb 2003, Mark Mitchell wrote:
>
> >
> >
> > --On Friday, February 21, 2003 06:36:07 PM +0100 Richard Guenther
> > <rguenth at tat.physik.uni-tuebingen.de> wrote:
> >
> > > I expected some critics on the patch, namely the following...
> > > (so I delay committing this).
> >
> > At one point, I think people wanted POOMA to be able to work on any types
> > that had normal arithmetic properties (roughly speaking, those that form a
> > field, in the algebraic sense.)  So, I'm not sure if explicitly initializng
> > things to "1" and such makes sense.
>
> Hmm - at least for such a type constructing from a 1 or 0 element as
> neutral element of multiplication/addition does make sense. Requiring
> numerical_limits<> specialization maybe, too.
>
> > But, I don't really know much about this -- it could be I'm totally off.
>
> Me too - maybe someone can think of a problematic case here. At least the
> patch brings a nice speedup and code size improvement for gcc3.2.

Just stubled over Field/FieldOffset.h which does reductions on
FieldOffsetLists the same way the old implementation did. But here all
loops are 1D, so no performance/code impact.

Richard.