[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):

 Why do you think `$fNFDataFloat_$crnf` should be inlined? It is not called
 in an interesting context; it is not applied to an argument we know
 something about.  Inlining would duplicate a case expression to elimiate a
 single jump.  Is this really the source of the regression, if any?

 Simon

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4138#comment:12>
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