[GHC] #10717: fannkuch-redux allocations increase by factor of 10000 between 7.4.2 and 7.6.3

[GHC]

#10717: fannkuch-redux allocations increase by factor of 10000 between 7.4.2 and
7.6.3
-------------------------------------+-------------------------------------
        Reporter:  bgamari           |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:  7.12.1
       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 Revisions:
-------------------------------------+-------------------------------------

Comment (by simonpj):

 Don't forget to check for which rules fired `-fddump-rule-firings`.
 Missing a fusion rule is a big deal

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10717#comment:5>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler