#14980: Runtime performance regression with binary operations on vectors -------------------------------------+------------------------------------- Reporter: ttylec | Owner: bgamari Type: bug | Status: new Priority: high | Milestone: 8.8.1 Component: Compiler | Version: 8.2.2 Resolution: | Keywords: vector | bitwise operations 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: | -------------------------------------+------------------------------------- Comment (by ttylec): Hm... not exactly the bug disappear, you observed no speedup with "binary packed" version in the first place. Notice that in my benchmark, the "binary packed" version is an order of magnitude faster that the "unbox vectors" and the bug is about loosing that speed-up when we compile with 8.2.2 (and later) In your case, there was no speed-up in the first place. May I ask you to check also `stack exec performance-bug-pair-2` and `stack exec performance-bug-2`? I am curious on what machine/system you did tested it? Oh, and obviously optimization must be enabled (in case you didn't `stack build` it). -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14980#comment:7 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler