[GHC] #14567: OccAnal loop-breaker scoring for NOINLINE things

8 Dec 2017


      #14567: OccAnal loop-breaker scoring for NOINLINE things
-------------------------------------+-------------------------------------
           Reporter:  simonpj        |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  8.2.1
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 When working on #14566 I found a case where the occurrence analyser
 generated
 {{{
 Rec { {-# NOINLINE f #-}
       f = e1[g]
     ; g {-# LOOPBREAKER #-} = e2[f] }
 }}}
 That is, even though `f` is marked `NOINLINE` we chose `g` to be the loop
 breaker.  Stupid!  If `f` is marked `NOINLINE` it would be a much better
 loop breaker.

-- 
Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14567
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