[GHC] #13219: CSE for join points

[GHC]

#13219: CSE for join points
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        Reporter:  lukemaurer        |                Owner:  lukemaurer
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.1
      Resolution:                    |             Keywords:  JoinPoints
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by simonpj):

 >  We just need to track which join points are still currently valid.

 Yes, and that would not be hard.  Just keep a join-point reverse map in
 the CSEnv, alongside the existing `cs_map`; and discard it when going into
 non-tail positions.

 A relatively easy win, but as you say a modest one.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13219#comment:1>
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