[GHC] #14361: GHC HEAD miscompiles `text-containers`

[GHC]

#14361: GHC HEAD miscompiles `text-containers`
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        Reporter:  hvr               |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:  8.4.1
       Component:  Compiler          |              Version:  8.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Incorrect result  |  Unknown/Multiple
  at runtime                         |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by bgamari):

 Another microoptimization that might be interesting to investigate is to
 try being a bit more clever when generating code for things like (where
 the type of `expr` is an enumeration),
 {{{
 case expr of
   A -> SomeCaf
   B -> SomeCaf'
   C -> SomeCaf''
   ...
 }}}

 Currently we branch on the tag of `expr` to one of a set of a
 continuations, all of which simply load the result and return. One could
 eliminate the branches by instead loading the continuation from a table
 and returning.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14361#comment:10>
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