#13397: Optimise calls to tagToEnum# -------------------------------------+------------------------------------- Reporter: simonpj | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.0.1 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): I found another reason to do this: `tagToEnum# (x ># y)` is floated out by full laziness, creating a new thunk and a free variable of the function closure. But plain `(x ># y)` is not: it's too cheap to be worth it. We could make `tagToEnum# (x ># y)` look cheaper, but if we eliminate it we don't have to bother. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13397#comment:5 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler