On Fri, Jul 19, 2013 at 9:58 AM, Jan Stolarek <jan.stolarek@p.lodz.pl> wrote:

It seems that currently there are no built-in constant folding rules for Integer div and mod. I plan on adding those rules, but before I do that I wanted to ask whether there is a good reason that these rules don't exist?

I would guess that Integer arithmetic doesn't affect people's performance much, because a lot of people steer away from Integer. I'd be focusing my attention on fixed-width numeric types and floating point, as likely to have a much larger real-world impact.