I'm having trouble when it doesn't fuse—it ends up with duplicate bindings
at the top level, because build gets inlined n times, and the result lifted
out. Nothing's *wrong* with the code, except that there are multiple copies
of it.
On Aug 15, 2014 10:58 AM, "GHC"
#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 simonpj):
Great. Just check that when fusion ''doesn't'' take place, the result is good. And do a `nofib` comparison for good luck. Then submit a patch.
Thanks for doing all this work on fusion, David.
Simon
-- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9434#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler