[GHC] #8763: forM_ [1..N] does not get fused (10 times slower than go function)

[GHC]

#8763: forM_ [1..N] does not get fused (10 times slower than go function)
-------------------------------------+-------------------------------------
        Reporter:  nh2               |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  7.6.3
      Resolution:                    |             Keywords:
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:                    |
-------------------------------------+-------------------------------------
Changes (by bgamari):

 * milestone:  8.0.2 => 8.2.1


Comment:

 I'm afraid 8.0.2 is out of the question. However, 8.2.1 is a possibility.
 Of course, any help that you, the reader, can offer would expedite the
 process.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8763#comment:25>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler