#15226: GHC doesn't know that seq# produces something in WHNF -------------------------------------+------------------------------------- Reporter: dfeuer | Owner: (none) Type: bug | Status: patch Priority: normal | Milestone: 8.6.1 Component: Compiler | Version: 8.4.3 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Runtime | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Phab:D4796 Wiki Page: | -------------------------------------+------------------------------------- Comment (by David Feuer <David.Feuer@…>): In [changeset:"d964b054d530ea9e29ed051fdf2b49a6afe465fb/ghc" d964b05/ghc]: {{{ #!CommitTicketReference repository="ghc" revision="d964b054d530ea9e29ed051fdf2b49a6afe465fb" Let the simplifier know that seq# forces Add a special case in `simplAlt` to record that the result of `seq#` is in WHNF. Reviewers: simonmar, bgamari, simonpj Reviewed By: simonpj Subscribers: simonpj, rwbarton, thomie, carter GHC Trac Issues: #15226 Differential Revision: https://phabricator.haskell.org/D4796 }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15226#comment:5> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler