[vector] #32: Performance of concatMap and O2/Odph

vector vector at projects.haskell.org
Thu Nov 18 18:24:21 EST 2010

#32: Performance of concatMap and O2/Odph
Reporter:  choener   |        Owner:       
    Type:  defect    |       Status:  new  
Priority:  critical  |    Milestone:  0.7.1
 Version:  0.6       |   Resolution:       
Keywords:            |  
Comment (by rl):

 Sigh. I fixed the [http://hackage.haskell.org/trac/ghc/ticket/4448 GHC
 problem] which also affected a couple of DPH programs but that didn't do a
 lot for this particular example. This is rather annoying.

 Nevertheless, I wonder if this GHC patch has any effect at all on your

 Thu Nov 18 13:28:39 PST 2010  Roman Leshchinskiy <rl at cse.unsw.edu.au>
  * ForceSpecConstr now forces specialisation even for arguments which
 aren't scrutinised

    M ./compiler/specialise/SpecConstr.lhs -24 +31

Ticket URL: <http://trac.haskell.org/vector/ticket/32#comment:12>
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