#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 tdammers): Performed an evil experiment: I put the `cabal.config` from LTS-11.1 into the project, then compiled with cabal, forcing the compiler to 8.0.2. Behavior is "good" (i.e., the 4th benchmark is in the 20-40 μs range. I also get the "good" behavior when compiling with 8.0.2, but without pinning. So it's definitely not the libraries. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14980#comment:21 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler