[GHC] #14137: Do more inlining into non-recursive join points

[GHC]

#14137: Do more inlining into non-recursive join points
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        Reporter:  simonpj           |                Owner:  nomeata
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.2.1
      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):

 {{{
          | Just _ <- willBeJoinId_maybe bndr    = env
 }}}
 I think `isJoinId` would be fine, and much faster.

 >  (The desired effect would be that ds5 gets inlined into lvl6, so that
 the remaining uses of ds5, all in joinrec safe, are tail-calls and ds5
 gets turned into a join point. Right?)

 Not quite: `ds5` won't be a join point; it'll disappear entirely by being
 inlined.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14137#comment:5>
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