[GHC] #11795: Performance issues with replicateM_

[GHC]

#11795: Performance issues with replicateM_
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        Reporter:  snoyberg          |                Owner:  snoyberg
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  libraries/base    |              Version:  7.10.3
      Resolution:                    |             Keywords:
Operating System:  MacOS X           |         Architecture:  x86_64
 Type of failure:  Runtime           |  (amd64)
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by snoyberg):

 Thanks for the quick response Simon. I'm definitely not deeply familiar
 with the state hack, but from what I can see the issue I'm reporting here
 may be orthogonal. Specifically, if I pass in `-fno-state-hack`, I still
 see the large-allocation behavior. I believe the issue here is twofold:

 * The specialize pragma is getting the way of inlining firing
 * The behavior of generating and consuming a list is less efficient than
 the simpler code I've provided here

 I'll be happy to add comments to any other issues as you see fit, but I
 don't want to add confusion to an already complicated issue if this is in
 fact separate from the state hack.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11795#comment:3>
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