[GHC] #6084: Add stg_ap_pnnv and related call patterns

[GHC]

#6084: Add stg_ap_pnnv and related call patterns
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    Reporter:  SimonMeier        |       Owner:  simonmar        
        Type:  feature request   |      Status:  new             
    Priority:  normal            |   Milestone:  7.8.1           
   Component:  Runtime System    |     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 simonmar):

 Replying to [comment:3 SimonMeier]:

 > The change only improves unknown calls with unboxed arguments and a
 final void argument. Attoparsec does not profit, as it does not require
 side-effects. The binary builder could profit, but in its current form it
 would additipnally require the stg_ap_pnnnv and stg_ap_nnnv call patterns.

 I don't understand why side-effects is an issue, and why you say that
 Attoparsec would not benefit.  Could you elaborate?

 Also I don't understand why Builder would benefit, because the unknown
 function in this case has type `(Buffer -> IO L.ByteString)`, which is
 just the `stg_ap_pv` pattern, which we already have (it is a higher-order
 function, so the `Buffer` argument won't be unboxed).

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/6084#comment:4>
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