[GHC] #13193: Integer (gmp) performance regression?

[GHC]

#13193: Integer (gmp) performance regression?
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           Reporter:  j.waldmann     |             Owner:
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  8.0.1
           Keywords:                 |  Operating System:  Linux
       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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 For a simple program that uses Integer, but actual data would fit in an
 Int, ghc-8.0.2 seems to have more runtime overhead than ghc-6.12.3 had:
 http://www.imn.htwk-leipzig.de/~waldmann/etc/mob/

 I am not really sure what to make of it - an answer could be:
 "if you know that your Integer fits in an Int, then just use Int".

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13193>
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