[GHC] #1811: liberate case needs an independent threshold

[GHC]

#1811: liberate case needs an independent threshold
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    Reporter:  simonmar  |        Owner:            
        Type:  bug       |       Status:  new       
    Priority:  normal    |    Milestone:  6.8 branch
   Component:  Compiler  |      Version:  6.8       
    Severity:  normal    |   Resolution:            
    Keywords:            |   Difficulty:  Unknown   
          Os:  Unknown   |     Testcase:            
Architecture:  Unknown   |  
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Changes (by simonmar):

  * owner:  simonmar =>
  * summary:  liberate case causes code duplication => liberate case needs
              an independent threshold

Comment:

 I re-did the measurements and got roughly consistent results for x86 and
 x86_64.

   * This patch did fix the particular case of code explosing I noticed,
 but
     it seems to have had little effect on anything else.  Code size for
 nofib
     dropped by <1%.
   * Turning off liberate-case for the libraries reduces code size for
 nofib by 5%.

 The threshold for liberate-case is currently shared with spec-constr, and
 is set too high at 200.  We need to be able to control the threshold for
 liberate-case independently of spec-constr, so I'm renaming this ticket.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1811#comment:5>
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