Hi, On Tue, Jan 4, 2011 at 11:40 AM, John Lato <jwl...@gmail.com> wrote:
> I've been using the CCA package with good results so far. Several people > (including myself) appear to have tried performing the CCA transformations > with a GADT rather than Template Haskell, without much success. Although > the code is transformed to normal form, performance isn't good. I suspect > that the transformations must be done in a pre-compilation stage in order to > present the normal form to GHC for the optimizer to produce the best > results. > I'm also working on this at the moment, and I believe the reason for the not-so-good performance is the large amount of variable "juggling" introduced by the CCA transformations (which I guess GHC will largely optimize out when compiling via Template Haskell). Unfortunately I don't see how to really solve this without just-in-time compiling; even if you optimize the juggling, you still have to synthetise the necessary juggling functions runtime. Balazs
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