#13623: join points produce bad code for stream fusion -------------------------------------+------------------------------------- Reporter: choenerzs | Owner: (none) Type: bug | Status: closed Priority: highest | Milestone: 8.2.1 Component: Compiler | Version: 8.2.1-rc1 Resolution: fixed | Keywords: JoinPoints Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: Runtime | Test Case: performance bug | perf/should_runt/T13623 Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by choenerzs): With ghc 8.2.-rc2 my original program is now fast again. However, compared to ghc-8.0.1 it is now necessary to explicitly give {{{-fspec-constr- count=100}}} as otherwise I end up with insufficient specializations. (The {{{100}}} is rather arbitrary, but the default is definitely not enough) -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13623#comment:13 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler