[GHC] #4138: Performance regression in overloading

[GHC]

#4138: Performance regression in overloading
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    Reporter:  simonmar          |       Owner:  pcapriotti                   
        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 pcapriotti):

 Here are some timings:

 ghc-6.12.3: 287 ms
 ghc-7.0.4:  316 ms
 ghc-7.2.1:  269 ms
 ghc-7.4.2:  265 ms
 ghc-HEAD:   267 ms

 It appears that the regression has been fixed sometime before 7.2.

 Before we close the ticket, should we remove the test case which checks
 whether `rnf` is inlined?

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4138#comment:16>
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