#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): Replying to [comment:13 simonpj]:
If the badness is only for a particular stack LTS, I wonder if the badness will go away in the next stack LTS and we can declare this ticket moot?
That would of course be a "beautiful" solution. I could try pinning it down to a specific library, and force that to the newest version in the LTS 11.1 build, see if that makes any difference. Another thing to try would be to create a `cabal.config` with the exact library versions that stack uses; if that reproduces the badness, then it's the libraries, but if it doesn't, then the most likely explanation is that cabal does something wrong. Yet another thing would be to set up two VMs, each of them having only one GHC toolchain installed, one for 8.0.2 and one for 8.2.2, and see if *that* has us reproduce the observed behavior. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14980#comment:15 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler