[GHC] #12962: No automatic SCC annotations for functions marked INLINABLE

[GHC]

#12962: No automatic SCC annotations for functions marked INLINABLE
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           Reporter:                 |             Owner:
  MikolajKonarski                    |
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Profiling      |           Version:  8.0.1
           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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 Judging from .prof files and the -xc and -prof callstacks, GHC adds no
 automatic SCC annotations for functions marked `INLINABLE`. The user's
 guide only mentions `INLINE`:
 https://downloads.haskell.org/~ghc/latest/docs/html/users_guide/profiling.html,
 not `INLINABLE`. Is it a bug in documentation or implementation? In my
 case I managed to work around by using `-fexpose-all-unfoldings` instead
 of the tons of `INLINABLE` I was using before, but in general case, adding
 all the SCC annotations by hand seems prohibitive. e.g., in code that
 needs a lot of `INLINABLE` to enable specialization.

 Since `-fexpose-all-unfoldings` does not inhibit profiling and compiling
 with no optimization doesn't help recover it, the culprit is probably not
 the actual inlining or specialization, but rather handling of the
 `INLINABLE` pragma itself.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12962>
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