[GHC] #5631: Compilation slowdown from 7.0.x to 7.2.x

[GHC]

#5631: Compilation slowdown from 7.0.x to 7.2.x
---------------------------------+------------------------------------------
    Reporter:  bjpop             |        Owner:  simonpj                     
        Type:  bug               |       Status:  new                         
    Priority:  highest           |    Milestone:  7.4.1                       
   Component:  Compiler          |      Version:  7.2.1                       
    Keywords:                    |     Testcase:                              
   Blockedby:                    |   Difficulty:                              
          Os:  Unknown/Multiple  |     Blocking:                              
Architecture:  Unknown/Multiple  |      Failure:  Compile-time performance bug
---------------------------------+------------------------------------------
Changes (by simonmar):

  * owner:  => simonpj


Comment:

 We have a partial fix that I am validating right now, this brings it down
 to

 {{{
 GHC 7.3.20111119:
    1,647,677,024 bytes allocated in the heap
   Total   time    4.21s  (  4.27s elapsed)
 }}}

 I will also attach a profile.  Simon is going to look into the remaining
 problems.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5631#comment:5>
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