Re: [GHC] #12754: Adding an explicit export list halves compilation time.

#12754: Adding an explicit export list halves compilation time. -------------------------------------+------------------------------------- Reporter: mpickering | Owner: mpickering Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.0.1 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:D2657 Wiki Page: | -------------------------------------+------------------------------------- Comment (by Matthew Pickering ): In [changeset:"4b72f859cd03ad3104c3935ea83ede68d0af6220/ghc" 4b72f85/ghc]: {{{ #!CommitTicketReference repository="ghc" revision="4b72f859cd03ad3104c3935ea83ede68d0af6220" Optimise whole module exports We directly build up the correct AvailInfos rather than generating lots of singleton instances and combining them with expensive calls to unionLists. There are two other small changes. * Pushed the nubAvails call into the explicit export list branch as we construct them correctly and uniquely ourselves. * fix_faminst only needs to check the first element of the export list as we maintain the (yucky) invariant that the parent is the first thing in it. Reviewers: simonpj, austin, bgamari Reviewed By: simonpj, bgamari Subscribers: simonpj, thomie, niteria Differential Revision: https://phabricator.haskell.org/D2657 GHC Trac Issues: #12754 }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12754#comment:14 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler