For what it is worth, Milan already implemented the smarter fromList and it is considerably faster. =)

If I'm reading his numbers right, its ~50% faster than the original in the worst case, and its about ~10x faster on large sorted inputs, and within 5% of the speed of fromDistinctAscList.

Overall, it is a huge win.

-Edward

On Thu, Aug 30, 2012 at 9:50 AM, Brent Yorgey <byorgey@seas.upenn.edu> wrote:

On Wed, Aug 29, 2012 at 06:06:25PM -0700, Johan Tibell wrote:
> On Wed, Aug 29, 2012 at 5:57 PM, Edward Kmett <ekmett@gmail.com> wrote:
> > This might pay off as well, but I am leery that its a rather tricky
> > balancing act and will take a lot of profiling to find the right balance in
> > practical performance vs. asymptotic bounds.
> >
> > Should we split the notion of improving the performance of fromList into a
> > separate project/proposal
> > that simply exposes synergies with this one?
>
> Sure. Lets continue this thread on its original topic. I'm +1 on the
> proposal.

+1 from me too.  A smarter fromList also sounds cool but I agree that
should be a separate proposal, if only to avoid derailing this one.

-Brent

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