[GHC] #5928: INLINABLE fails to specialize in presence of simple wrapper

[GHC]

#5928: INLINABLE fails to specialize in presence of simple wrapper
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    Reporter:  tibbe             |       Owner:                  
        Type:  bug               |      Status:  patch           
    Priority:  normal            |   Milestone:  7.6.2           
   Component:  Compiler          |     Version:  7.4.1           
    Keywords:                    |          Os:  Unknown/Multiple
Architecture:  Unknown/Multiple  |     Failure:  None/Unknown    
  Difficulty:  Unknown           |    Testcase:                  
   Blockedby:                    |    Blocking:                  
     Related:                    |  
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Comment(by tibbe):

 After discussing with simonpj, I tried to instead move the existing
 specialise pass to after the simplifier pass. This hurt performance a bit
 (runtime +2.6%) and resulted in way fewer specialisations (down to 136
 from 230 for the whole nofib suite). Adding a second specialise pass (for
 a total of two) just after the main simplifier core pass increased the
 number of specialisations to 242, but showed no improvement in performance
 on nofib.

 The next step is probably to check why so many fewer specialisations were
 created when when the single passed was moved later in the pipeline.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5928#comment:15>
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