[GHC] #5536: IO performance regression in 7.2 vs 7.0

[GHC]

#5536: IO performance regression in 7.2 vs 7.0
---------------------------------+------------------------------------------
    Reporter:  simonmar          |        Owner:  batterseapower
        Type:  bug               |       Status:  new           
    Priority:  high              |    Milestone:  7.4.1         
   Component:  libraries/base    |      Version:  7.2.1         
    Keywords:                    |     Testcase:                
   Blockedby:                    |   Difficulty:                
          Os:  Unknown/Multiple  |     Blocking:                
Architecture:  Unknown/Multiple  |      Failure:  None/Unknown  
---------------------------------+------------------------------------------

Comment(by simonpj):

 That would be a great idea, thanks.  The code from a case-of-case should
 be pretty good; it it isn't we should fix ssomething.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5536#comment:9>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler