#8763: forM_ [1..N] does not get fused (10 times slower than go function) -------------------------------------+------------------------------------- Reporter: nh2 | Owner: (none) Type: bug | Status: infoneeded Priority: normal | Milestone: 8.6.1 Component: Compiler | Version: 7.6.3 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Runtime | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: #7206 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by akio): I haven't confirmed, but it looks like 2effe18ab51d66474724d38b20e49cc1b8738f60 may have fixed this. Now fusion happens during the "gentle" phase of simplifier, which happens before any of the float-out passes. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/8763#comment:38 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler