#11095: -O0 -g slows GHC down on list literals (compared to -O0 without -g) -------------------------------------+------------------------------------- Reporter: slyfox | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.10.2 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): phab:D3001 Wiki Page: | -------------------------------------+------------------------------------- Comment (by bgamari): There is a `nubBy` in `Debug` which uses `tickishContains` which would make this N^2. This is likely the reason why the above patch made such a difference. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11095#comment:7 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler