Convert lambda expressions to CCC combinators and then to circuits.

Additional info:

• Project notes.
• The talk From Haskell to Hardware via CCCs.
• Instructions in test/Tests.hs.

Dependencies:

• GHC 7.8.2 or better
• KURE, commit 7ce26aa
• HERMIT, commit 5557609
• hermit-extras
• circat, for circuit specification, display, and conversion to netlists.

To use these versions of KURE and HERMIT, clone the repos (or pull if already cloned), and use "git checkout [commit-id]".

To try out:

• cabal install circat and lambda-ccc (in that order)

• In a shell, cd to lambda-ccc/test, and type make. If all works, you'll see something like the following output:

  bash-3.2$ ./test
  [starting HERMIT v0.5.0.1 on TreeTest.hs]
  % ghc TreeTest.hs -fforce-recomp -O2 -dcore-lint -fsimple-list-literals -fexpose-all-unfoldings -fplugin=LambdaCCC.Monomorphize -fplugin-opt=LambdaCCC.Monomorphize:-v0 -fplugin-opt=LambdaCCC.Monomorphize:DoTree.hss -fplugin-opt=LambdaCCC.Monomorphize:resume -fplugin-opt=LambdaCCC.Monomorphize:*: -v0
  
  real	0m6.098s
  user	0m5.968s
  sys	0m0.245s
  let f = \ ds -> abst (repr ds) in let f0 = \ ds -> let (a1,a'1) = repr (repr ds) in abst (repr (f a1) + repr (f a'1)) in let f1 = \ ds -> let (a1,a'1) = repr (repr ds) in abst (repr (f0 a1) + repr (f0 a'1)) in let f2 = \ eta -> let a = repr eta in abst (a * a) in let f3 = \ eta -> abst (let (a1,a'1) = repr (repr eta) in abst (f2 a1,f2 a'1)) in let f4 = \ eta -> abst (let (a1,a'1) = repr (repr eta) in abst (f3 a1,f3 a'1)) in \ x -> let (a1,a'1) = repr (let (a1,a'1) = repr (repr x) in abst (f4 a1,f4 a'1)) in repr (f1 a1) + repr (f1 a'1)
  Wrote out/sumSquare-t3.pdf
  Wrote out/sumSquare-t3.v.txt
  

The .v.txt file is Verilog code. Additionally the PDF will be displayed if the display code figures out how to on your system.

There are many other examples in test/TreeTest.hs. At any time, all examples but one are commented out.