#9646: Simplifer non-determinism leading to 8 fold difference in run time performance -------------------------------------+------------------------------------- Reporter: erikd | Owner: Type: bug | Status: closed Priority: normal | Milestone: 7.10.1 Component: Compiler | Version: 7.8.3 Resolution: fixed | Keywords: Operating System: Linux | Architecture: x86_64 (amd64) Type of failure: Runtime | Difficulty: Unknown performance bug | Blocked By: Test Case: | Related Tickets: Blocking: | Differential Revisions: | -------------------------------------+------------------------------------- Changes (by thomie): * status: new => closed * resolution: => fixed * milestone: => 7.10.1 Comment: I just ran `make` in a clone of the testrepo from comment:12, after installing `primitive-0.5.4` in a cabal sandbox. Results with GHC 7.8.3: {{{ Fast version etas : 0 Slow version etas : 18 }}} Results with GHC 7.9.20141108: {{{ Fast version etas : 0 Slow version etas : 0 }}} So this bug must have been fixed somewhere along the way, although I don't know in which commit. Feel free to reopen if you think this answer is unsatisfactory, or hang tight till the 7.10 release. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9646#comment:13 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler