Re: Monomorphizing GHC Core?
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 ___ Glasgow-haskell-users mailing list Glasgow-haskell-users@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
Re: Monomorphizing GHC Core?
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 ___ Glasgow-haskell-users mailing list Glasgow-haskell-users@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
Re: Monomorphizing GHC Core?
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 ___ Glasgow-haskell-users mailing list Glasgow-haskell-users@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
