#14295: tagToEnum# leads to some silly closures -------------------------------------+------------------------------------- Reporter: dfeuer | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: 8.4.1 Component: Compiler | Version: 8.2.1 Resolution: | Keywords: datacon-tags Operating System: Unknown/Multiple | Architecture: Type of failure: Runtime | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by dfeuer): Specifically, any time CorePrep is tempted to produce {{{#!hs let x = tagToEnum# @KnownType y in e }}} it should pause a moment and instead produce {{{#!hs case leWord# (int2Word# y) limit of DEFAULT -> error "blah" 1# -> case tagToEnum# @KnownType y of x DEFAULT -> e }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14295#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler