[GHC] #9136: Constant folding in Core could be better

[GHC]

#9136: Constant folding in Core could be better
--------------------------------------------+------------------------------
        Reporter:  simonpj                  |            Owner:  nomeata
            Type:  bug                      |           Status:  new
        Priority:  normal                   |        Milestone:
       Component:  Compiler                 |          Version:  7.8.2
      Resolution:                           |         Keywords:
Operating System:  Unknown/Multiple         |     Architecture:
 Type of failure:  Runtime performance bug  |  Unknown/Multiple
       Test Case:                           |       Difficulty:  Unknown
        Blocking:                           |       Blocked By:
                                            |  Related Tickets:
--------------------------------------------+------------------------------
Changes (by nomeata):

 * owner:   => nomeata


Comment:

 I couldn’t resist to get started on this, so branch `wip/T9136` contains a
 test case ([changeset:d4081919/ghc]) and a first implementation for `+`
 ([changeset:115fd8b043/ghc]). Not polished and complete yet, and not yet
 validated, but it goes in the right direction I think.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9136#comment:6>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler