#13873: Adding a SPECIALIZE at a callsite in Main.hs is causing a regression -------------------------------------+------------------------------------- Reporter: jberryman | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: 8.2.2 Component: Compiler | Version: 8.2.1-rc2 Resolution: | Keywords: Specialise Operating System: Unknown/Multiple | Architecture: Type of failure: Runtime | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by simonpj): * keywords: => Specialise Comment: As I understand it, you are saying that * adding a SPECIALISE pragma with 8.2 made the the code runs 2x slower Whereas adding the same pragma with 8.0 made the code run 3x faster. (But still not as fast as the slowest version with 8.2.) But it's the bulleted point that is mysterious. Ben please do investigate. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13873#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler