[GHC] #16335: Make CPR Analysis more aggressive for inductive cases

[GHC]

#16335: Make CPR Analysis more aggressive for inductive cases
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        Reporter:  sgraf             |                Owner:  (none)
            Type:  task              |               Status:  new
        Priority:  normal            |            Milestone:  ⊥
       Component:  Compiler          |              Version:  8.6.3
      Resolution:                    |             Keywords:  CPRAnalysis
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):

 Nicely characterised.

 CPR (to one level) is always sound; it may just do some unnecessary
 reboxing.

 So we could just try saying that a function has the CPR property if
 ''any'' of its case branches do, rather than (as now) if 'all' do.  That
 would, I assume, be a rather easy experiment to try.

 (It'd be lovely to know what are the hot branches!)

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16335#comment:1>
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