Yes, but I'm not sure how to do that, especially because foldl doesn't have the phased NOINLINE that foldr does. On Aug 15, 2014 12:45 PM, "Dan Doel" <[email protected]> wrote:
> Isn't this kind of thing fixed for other functions by rewriting back into > the direct recursive definition if no fusion happens? > > > On Fri, Aug 15, 2014 at 11:41 AM, David Feuer <[email protected]> > wrote: > >> 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" <[email protected]> wrote: >> >>> #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 >>> >> >> _______________________________________________ >> ghc-devs mailing list >> [email protected] >> http://www.haskell.org/mailman/listinfo/ghc-devs >> >> >
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