[GHC] #701: Better CSE optimisation

[GHC]

#701: Better CSE optimisation
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    Reporter:  simonmar              |       Owner:  michalt         
        Type:  task                  |      Status:  new             
    Priority:  normal                |   Milestone:  _|_             
   Component:  Compiler              |     Version:  6.4.1           
    Keywords:                        |          Os:  Unknown/Multiple
Architecture:  Unknown/Multiple      |     Failure:  None/Unknown    
  Difficulty:  Difficult (2-5 days)  |    Testcase:  N/A             
   Blockedby:                        |    Blocking:                  
     Related:                        |  
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Comment(by simonmar):

 Looking at the tickets, they don't completely overlap.  This one is about
 spotting common subexpressions when they don't occur in the form `let x =
 e in E[e]`. #2940 would fix some of those cases, but not all.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/701#comment:14>
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