#9434: GHC.List.reverse does not fuse -------------------------------------+------------------------------------- Reporter: dfeuer | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: | Version: 7.9 libraries/base | Keywords: Resolution: | Architecture: Unknown/Multiple Operating System: | Difficulty: Easy (less than 1 Unknown/Multiple | hour) Type of failure: Runtime | Blocked By: performance bug | Related Tickets: Test Case: | Blocking: | Differential Revisions: | -------------------------------------+------------------------------------- Comment (by dfeuer): Oh yes, of course. We want to wrap it in `build` to make it fuse with `map`. `reverse` inherently has lousy fusion behavior, but I think we should still do what we can. I think even improving the simple cases of `map f . reverse` and `reverse . map f` is sufficient to justify this change. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9434#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler