
#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 simonpj): This smells to me like a crucial fusion rule not firing. You could try compiling with `-ddump-rule-firings` and see if the "good" and "bad" output differs. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14980#comment:24 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler