#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: | Phab:D5201 -------------------------------------+------------------------------------- Comment (by osa1): Interestingly, if I revert the Cmm bits and always introduce a case on dataToTag# args in CorePrep I can validate. Patch is [https://github.com/osa1/ghc/commit/1b9bd4769c2c70b23ef8739aba116f9d18628b00 here]. I'll compare the differences in generated code in this branch and Phab:D5201. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15696#comment:56 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler