[GHC] #4414: scc001 fails: one SCC entered 0 times; another not mentioned when optimisation is on

[GHC]

#4414: scc001 fails: one SCC entered 0 times; another not mentioned when
optimisation is on
---------------------------------+------------------------------------------
    Reporter:  igloo             |        Owner:  simonmar    
        Type:  bug               |       Status:  new         
    Priority:  normal            |    Milestone:  7.2.1       
   Component:  Profiling         |      Version:  6.12.3      
    Keywords:                    |     Testcase:              
   Blockedby:                    |   Difficulty:              
          Os:  Unknown/Multiple  |     Blocking:              
Architecture:  Unknown/Multiple  |      Failure:  None/Unknown
---------------------------------+------------------------------------------

Comment(by augustss):

 The entry counts are invaluable, please don't remove them.
 Performance bugs are often about something getting evaluated more times
 than you expect, and without the entry counts there's no way to determine
 that.
 I'd settle for a flag, though.  Exact entry count and slower code, or
 inaccurate entry counts and fast code.  Sometimes you need one, sometimes
 the other.

 I'd also like to urge you to fix this, because profiling is the only way
 to speed up large program; staring at core only works for kernels.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4414#comment:12>
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