[GHC] #1984: weird performance drop with -O2 on x86

[GHC]

#1984: weird performance drop with -O2 on x86
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 Reporter:  guest     |          Owner:         
     Type:  bug       |         Status:  new    
 Priority:  normal    |      Milestone:         
Component:  Compiler  |        Version:  6.8.2  
 Severity:  normal    |     Resolution:         
 Keywords:            |     Difficulty:  Unknown
 Testcase:            |   Architecture:  x86    
       Os:  Linux     |  
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Comment (by dons):

 I can reproduce this with 6.8.1 on x86/linux, but on amd64/openbsd things
 appear as normal.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1984#comment:1>
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