I have patches for DPH that let it work with vector 0.11 as of a few months ago. I would be happy to submit them via phabricator if that is agreeable (we have to coordinate with the import of vector 0.11 though...I can instead leave them in a wip branch for Austin to merge as he sees fit). I am also willing to commit some time to keep DPH at least working in its current state.
Geoff On 8/4/14 8:18 AM, Ben Lippmeier wrote: > On 4 Aug 2014, at 21:47 , Austin Seipp <aus...@well-typed.com> wrote: > >> Why? Because I'm afraid I just don't have any more patience for DPH, >> I'm tired of fixing it, and it takes up a lot of extra time to build, >> and time to maintain. > I'm not going to argue against cutting it lose. > > >> So - why are we still building it, exactly? > It can be a good stress test for the simplifier, especially the SpecConstr > transform. The fact that it takes so long to build is part of the reason it's > a good stress test. > > >> [1] And by 'speak up', I mean I'd like to see someone actively step >> forward address my concerns above in a decisive manner. With patches. > I thought that in the original conversation we agreed that if the DPH code > became too much of a burden it was fine to switch it off and let it become > unmaintained. I don't have time to maintain it anymore myself. > > The original DPH project has fractured into a few different research streams, > none of which work directly with the implementation in GHC, or with the DPH > libraries that are bundled with the GHC build. > > The short of it is that the array fusion mechanism implemented in DPH (based > on stream fusion) is inadequate for the task. A few people are working on > replacement fusion systems that aim to solve this problem, but merging this > work back into DPH will entail an almost complete rewrite of the backend > libraries. If it the existing code has become a maintenance burden then it's > fine to switch it off. > > Sorry for the trouble. > Ben. > _______________________________________________ ghc-devs mailing list ghc-devs@haskell.org http://www.haskell.org/mailman/listinfo/ghc-devs
