[GHC] #6082: Program compiled with 7.4.1 runs many times slower than compiled with 7.2.2

[GHC]

#6082: Program compiled with 7.4.1 runs many times slower than compiled with 7.2.2
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  Reporter:  gchrupala                |          Owner:  pcapriotti      
      Type:  bug                      |         Status:  new             
  Priority:  high                     |      Milestone:  7.6.1           
 Component:  libraries (other)        |        Version:  7.4.1           
Resolution:                           |       Keywords:                  
        Os:  Unknown/Multiple         |   Architecture:  Unknown/Multiple
   Failure:  Runtime performance bug  |     Difficulty:  Unknown         
  Testcase:                           |      Blockedby:                  
  Blocking:                           |        Related:                  
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Comment(by simonpj@…):

 commit 79062a8a0e9168b7f925c05699c30333563a9303
 {{{
 Author: Simon Peyton Jones <simonpj at microsoft.com>
 Date:   Mon Jul 23 09:17:09 2012 +0100

     Make the desugarer warn about RULES that may not fire

     This warning was suggested by Trac #6082, where we had
     a library RULE that failed to fire because its function
     was inlined too soon.

  compiler/deSugar/Desugar.lhs |   23 +++++++++++++++++++++++
  1 files changed, 23 insertions(+), 0 deletions(-)
 }}}

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/6082#comment:13>
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