[GHC] #6111: Simple loop performance regression of 7.4.1 relative to 7.0.4

[GHC]

#6111: Simple loop performance regression of 7.4.1 relative to 7.0.4
--------------------------------------------+-------------------------------
    Reporter:  mdgabriel                    |       Owner:  igloo                  
        Type:  bug                          |      Status:  new                    
    Priority:  normal                       |   Milestone:                         
   Component:  Compiler                     |     Version:  7.4.1                  
    Keywords:  Loop performance regression  |          Os:  Linux                  
Architecture:  x86                          |     Failure:  Runtime performance bug
  Difficulty:  Unknown                      |    Testcase:                         
   Blockedby:                               |    Blocking:                         
     Related:  #6110                        |  
--------------------------------------------+-------------------------------

Comment(by simonmar):

 This is related to #5888, which also demands more rules for Integer.

 The reason the rules are all in `PrelRules`, as I understand it, is
 because they need to work with Integer constants which are now a Core
 literal.  I agree the design should really be written down somewhere, we
 did go through a few iterations to arrive at this point and it would be
 good to record why (I'm sure Ian left some Notes in the code too though).

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/6111#comment:2>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler