[GHC] #7450: Regression in optimisation time of functions with many patterns (6.12 to 7.4)?

[GHC]

#7450: Regression in optimisation time of functions with many patterns (6.12 to
7.4)?
-------------------------------------+-------------------------------------
        Reporter:  iustin            |                   Owner:  bgamari
            Type:  bug               |                  Status:  patch
        Priority:  normal            |               Milestone:  7.12.1
       Component:  Compiler          |                 Version:  7.6.1
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  performance bug                    |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:  Phab:D1012
-------------------------------------+-------------------------------------

Comment (by bgamari):

 In particular most of this appears to be coming from
 `CmmBuildInfoTables.procpointSRT.bitmap`.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7450#comment:23>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler