#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 scpmw): I think dfeuer has managed to identify the core of the issue, so the hard work should be done. As I sketched there are a good number of options for how to fix it, and we could even fall back to special handling for deeply nested constructors with tick annotations in CorePrep if the more elegant approaches turn out not to work. I'll put some time into it over the weekend if nobody else grabs it first. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11095#comment:15 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler