#15696: Derived Ord instance for enumerations with more than 8 elements seems to be incorrect -------------------------------------+------------------------------------- Reporter: mrkkrp | Owner: (none) Type: bug | Status: patch Priority: highest | Milestone: 8.6.2 Component: Compiler | Version: 8.6.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Incorrect result | Unknown/Multiple at runtime | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Phab:D5196 Wiki Page: | -------------------------------------+------------------------------------- Comment (by dfeuer): What I've been suggesting is that even when we don't statically know if it's been evaluated or tagged, we should surely be using tag bits when we find them. It looks like an oversight that we haven't done so in the past, and I foresee substantial benefits to fixing that. Perhaps we can win back more performance than we lose. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15696#comment:39 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler