On Wed, 1 Apr 2020 at 02:49, Alexis King <lexi.lam...@gmail.com> wrote:
> > I’ve been trying to figure out if it would be possible to help the > optimizer out by annotating the program with special combinators like the > existing ones provided by GHC.Magic. However, I haven’t been able to come > up with anything yet that seems like it would actually work. > You may want to take a look at https://github.com/composewell/fusion-plugin which uses annotations to help GHC fuse, not specifically what you want but might possibly be relevant to your work. https://github.com/composewell/streamly relies heavily on case-of-case and SpecConstr for stream fusion. There are several cases that GHC is unable to fuse currently. We use a "Fuse" annotation to tell GHC that any function involving this type must be inlined so that fusion can occur reliably. With the help of fusion-plugin we have been able to fuse almost every known case in streamly till now. -harendra
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