3 Feb
2008
3 Feb
'08
12:31 p.m.
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