[GHC] #6110: Data.Vector.Unboxed performance regression of 7.4.1 relative to 7.0.4

[GHC]

#6110: Data.Vector.Unboxed performance regression of 7.4.1 relative to 7.0.4
--------------------------------------+-------------------------------------
  Reporter:  mdgabriel                |          Owner:  pcapriotti                   
      Type:  bug                      |         Status:  closed                       
  Priority:  high                     |      Milestone:  7.4.3                        
 Component:  Compiler                 |        Version:  7.4.1                        
Resolution:  fixed                    |       Keywords:  Vector Performance Regression
        Os:  Linux                    |   Architecture:  x86                          
   Failure:  Runtime performance bug  |     Difficulty:  Unknown                      
  Testcase:                           |      Blockedby:                               
  Blocking:                           |        Related:  #6111                        
--------------------------------------+-------------------------------------
Changes (by mdgabriel):

  * status:  infoneeded => closed
  * resolution:  => fixed


Comment:

 @pcapriotti and @igloo:

 I built the head of GHC with the changeset
 c7a8941b04541789e60950bb126902effae0ccab of #6110, and this recovered the
 vast majority of the performance difference that I observed between 7.0.4
 and 7.4.1.

 The version 7.4.1 is still slower than 7.0.4 for me, but I most likely
 would not have noticed this difference if the above changeset had already
 been in place.  For me, this ticket is closed.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/6110#comment:14>
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