[GHC] #3064: Very long compile times with type functions

[GHC]

#3064: Very long compile times with type functions
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    Reporter:  simonpj                  |        Owner:  chak                        
        Type:  bug                      |       Status:  new                         
    Priority:  low                      |    Milestone:  7.0.1                       
   Component:  Compiler (Type checker)  |      Version:  6.10.1                      
    Keywords:                           |     Testcase:                              
   Blockedby:                           |   Difficulty:  Unknown                     
          Os:  Unknown/Multiple         |     Blocking:                              
Architecture:  Unknown/Multiple         |      Failure:  Compile-time performance bug
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Comment(by CoreyOConnor):

 The following patch looked like it resolves this issue:
 [http://darcs.haskell.org/cgi-
 bin/darcsweb.cgi?r=ghc;a=darcs_commitdiff;h=20100923143918-da291-8d319e1acf18f9a9bf8c92e266683968bb7e2d73.gz
 Performance bug fixes]

 Testing with the attached example:
 {{{
 [coconnor at toast scratch]$ time ../inplace/bin/ghc-stage2 -c Bug2.hs

 real    0m0.716s
 user    0m0.700s
 sys     0m0.015s
 [coconnor at toast scratch]$ time ../inplace/bin/ghc-stage2 -c Bug2.hs

 real    0m0.945s
 user    0m0.931s
 sys     0m0.014s
 [coconnor at toast scratch]$ time ../inplace/bin/ghc-stage2 -c Bug2.hs

 real    0m1.192s
 user    0m1.169s
 sys     0m0.021s
 [coconnor at toast scratch]$ time ../inplace/bin/ghc-stage2 -c Bug2.hs

 real    0m1.515s
 user    0m1.492s
 sys     0m0.022s
 }}}

 I think this is resolved! Awesome work! I have a data marshaling library
 that will greatly benefit from such a speedup.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3064#comment:11>
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