#7561: Unnecessary Heap Allocations - Slow Performance
    Reporter:  wurmli          |       Owner:                         
        Type:  bug             |      Status:  new                    
    Priority:  normal          |   Milestone:  7.8.1                  
   Component:  Compiler        |     Version:  7.6.1                  
    Keywords:                  |          Os:  Linux                  
Architecture:  x86_64 (amd64)  |     Failure:  Runtime performance bug
  Difficulty:  Unknown         |    Testcase:                         
   Blockedby:                  |    Blocking:                         
     Related:                  |  
Changes (by simonmar):

 * cc: benl, rl@… (added)
  * component:  Build System => Compiler
  * milestone:  => 7.8.1


 I just reproduced it with 7.4.1: the program does appear to run many times
 faster with profiling ''enabled'', which is indeed very suspicious.

 I suggest that someone familiar with `vector` has a look to see which
 optimisation or RULE is not happening.  Roman or Ben perhaps?

Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7561#comment:2>
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