Deforesting edtiInt

[Ian Lynagh]

Hi Robin,

On Thu, Jan 31, 2008 at 11:05:32PM +0000, Robin Houston wrote:
> 
> Except that it is a lot slower than it needs to be. After digging
> around a bit, I suspected that the reason for this is that the general
> form of enumeration [from, then .. to] does not benefit from the
> deforestation optimisation.
> 
> When I added some deforestation rules to GHC/Enum.lhs and rebuilt the
> library, I found my suspicion confirmed: after the change, my code
> runs roughly twice as fast.

Thanks for the patch! Looks good to me; I've applied it.


Thanks
Ian