[GHC] #14951: SpecContsr needs two runs when one should suffice

[GHC]

#14951: SpecContsr needs two runs when one should suffice
-------------------------------------+-------------------------------------
        Reporter:  nomeata           |                Owner:  (none)
            Type:  task              |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.2.2
      Resolution:                    |             Keywords:  SpecConstr
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #14844            |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by nomeata):

 >  potentially little more bloat for every non-recursive binding.

 It’s not just non-recursive bindings. It’s gonna bloat
  * every binding
  * that has interesting calls
  * that itself calls a local function
  * which itself is being specialized
  * and where the specialization of the inner function match the calls to
 the outer
  * but matches them only partially (the case where they match completely
 is the one we are interested in).

 which seems pretty narrow to me.

 >  Also depending on how far you are with your changes to SpecConstr, this
 could be simpler.

 They were pretty simple it needs just a bit more cleanup, see
 [https://github.com/ghc/ghc/compare/wip/T14951 wip/T14951]. I am basically
 waiting for perf.haskell.org to report the results.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14951#comment:15>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler