[GHC] #4138: Performance regression in overloading

[GHC]

#4138: Performance regression in overloading
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    Reporter:  simonmar          |       Owner:  simonpj                      
        Type:  bug               |      Status:  new                          
    Priority:  high              |   Milestone:  7.6.1                        
   Component:  Compiler          |     Version:  6.13                         
    Keywords:                    |          Os:  Unknown/Multiple             
Architecture:  Unknown/Multiple  |     Failure:  Runtime performance bug      
  Difficulty:  Unknown           |    Testcase:  simplCore/shouldCompile/T4138
   Blockedby:                    |    Blocking:                               
     Related:                    |  
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Comment(by simonpj):

 Well 17 months ago Simon M wrote "We think the performance is almost back
 to where it was with 6.12, but not quite, and we'll take another look for
 7.2.1".  Could you possibly check the performance as of today?  It would
 be good to know whether we have a regression or not; and if so, whether
 it's due to this extra jump (which I rather doubt).  Thanks

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4138#comment:14>
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