[GHC] #13001: EnumFromThenTo is is not a good producer

[GHC]

#13001: EnumFromThenTo is is not a good producer
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        Reporter:  George            |                Owner:
            Type:  bug               |               Status:  new
        Priority:  low               |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      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 simonpj):

 I think perhaps you mean that in the call
 {{{
 I# x `c` go_up (x +# delta)
 }}}
 since GHC doesn't know `c` is strict, it'll allocate a thunk for the
 second argument.  Quite true.  And that does mean it'd be good to inline
 `efdtIntUpFB`, I agree.

 But still, fewer Int boxes is better regardless.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13001#comment:6>
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