[webkit-dev] Transformations precision: double -> float

[Ryosuke Niwa]

Maybe you can add a typedef in Platform.h to make it configurable? e.g.
maybe you want to be able to use long double instead of regular double in
the future.

- Ryosuke

On Mon, May 21, 2012 at 10:34 AM, Simon Fraser <simon.fraser at apple.com>wrote:

> TransformationMatrix started out as floats, then got changed to doubles in
> <http://trac.webkit.org/changeset/40761>
>
> This was done because on most hardware there is no penalty for using
> doubles over floats, and provided a better match with our system APIs that
> used doubles.
>
> I'd prefer to take a forward-looking stance here, and assume that in time
> hardware will catch up.
>
> Simon
>
> On May 21, 2012, at 4:04 AM, Zoltan Herczeg wrote:
>
> > Hi,
> >
> > is there any reason why the transformations in WebKit use doubles? We
> > could optimize some functions further with ARM SIMD if they would be
> > floats. Is there any objection to make them float if the change would
> have
> > no other side effects except some rounding because of the lower
> precision?
> >
> > Regards,
> > Zoltan
> >
> >
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