[GHC] #11564: Possible overzealous unfolding

[GHC]

#11564: Possible overzealous unfolding
-------------------------------------+-------------------------------------
        Reporter:  simonmar          |                Owner:
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:
       Component:  Compiler          |              Version:  8.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D1900
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by simonmar):

 I looked at the `-dverboseI looked at the `-dverbose-core2core` for
 `T5631` and it's identical between the before and after compilers, so this
 is a difference in the performance of GHC itself after this change.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11564#comment:7>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler