[GHC] #11365: Worse performance with -O

[GHC]

#11365: Worse performance with -O
-------------------------------------+-------------------------------------
        Reporter:                    |                Owner:
  facundo.dominguez                  |
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:
      Resolution:                    |             Keywords:  optimization
                                     |  performance concurrency
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Runtime           |  Unknown/Multiple
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by simonpj):

 Ah yes!  Just search for "`replicateM`" and you'll see a raft of tickets
 about this one problem!

 If someone would like to dig further, I'd be happy to help.

 Simon

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11365#comment:2>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler