[GHC] #8742: Reuse scavenge_small_bitmap

[GHC]

#8742: Reuse scavenge_small_bitmap
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        Reporter:  Tarrasch          |            Owner:
            Type:  task              |           Status:  new
        Priority:  lowest            |        Milestone:  7.10.1
       Component:  Runtime System    |          Version:  7.6.3
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Comment (by simonmar):

 Is the code better or worse with the inline function?

 I'd be surprised if gcc wasn't smart enough to optimise that.  But that's
 why we test these things rather than assuming it'll work.  The GC has
 various workarounds for quirks and missing optimisations in gcc; I tend to
 treat the whole of the GC as performance-critical code.

 If you want to share this code without the performance loss (and the
 inline function really doesn't work) then maybe try a macro, if that's not
 too ugly.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8742#comment:7>
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