#13182: Rethinking dataToTag# -------------------------------------+------------------------------------- Reporter: dfeuer | Owner: Type: task | Status: new Priority: normal | Milestone: 8.2.1 Component: Compiler | Version: 8.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by simonpj):
Then dataToTag# could be inlined in CorePrep, just like runRW#.
I think that is precisely equivalent to what happens now, so yes it'd be ok. But then `CorePrep` would need to be able to eliminate the freshly- introduced case if it was redundant: {{{ case x of { DEFAULT -> dataToTag# x } }}} Now if we inline `dataToTag#` we'll get a second case that must be eliminated. The simplifier does this already. To me the status quo looks simpler. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13182#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler