I think the first time I saw a connection to polymorphic recursion was in Neil Mitchell's supero, which used it as a catch-all fallback plan.
http://community.haskell.org/~ndm/downloads/slides-haskell_with_go_faster_stripes-30_nov_2006.pdf -Edward On Thu, Jun 19, 2014 at 4:49 PM, Conal Elliott <co...@conal.net> wrote: > Thanks, Ed. It hadn't occurred to me that defunctionalization might be > useful for monomorphization. Do you know of a connection? > > I'm using a perfect leaf tree type similar to the one you mentioned but > indexed by depth: > > > data Tree :: (* -> *) -> Nat -> * -> * where > > L :: a -> Tree k 0 a > > B :: Tree k n (k a) -> Tree k (1+n) a > > Similarly for "top-down" perfect leaf trees: > > > data Tree :: (* -> *) -> Nat -> * -> * where > > L :: a -> Tree k 0 a > > B :: k (Tree k n a) -> Tree k (1+n) a > > This way, after monomorphization, there won't be any sums remaining. > > -- Conal > > > > On Thu, Jun 19, 2014 at 1:22 PM, Edward Kmett <ekm...@gmail.com> wrote: > >> Might you have more success with a Reynolds style defunctionalization >> pass for the polymorphic recursion you can't eliminate? >> >> Then you wouldn't have to rule out things like >> >> data Complete a = S (Complete (a,a)) | Z a >> >> which don't pass that test. >> >> -Edward >> >> >> On Thu, Jun 19, 2014 at 3:28 PM, Conal Elliott <co...@conal.net> wrote: >> >>> Has anyone worked on a monomorphizing transformation for GHC Core? I >>> understand that polymorphic recursion presents a challenge, and I do indeed >>> want to work with polymorphic recursion but only on types for which the >>> recursion bottoms out statically (i.e., each recursive call is on a smaller >>> type). I'm aiming at writing high-level polymorphic code and generating >>> monomorphic code on unboxed values. This work is part of a project for >>> compiling Haskell to hardware, described on my blog (http://conal.net). >>> >>> Thanks, - Conal >>> >>> _______________________________________________ >>> Glasgow-haskell-users mailing list >>> Glasgow-haskell-users@haskell.org >>> http://www.haskell.org/mailman/listinfo/glasgow-haskell-users >>> >>> >> >
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