[GHC] #8351: Arrays are always allocated out-of-line

[GHC]

#8351: Arrays are always allocated out-of-line
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       Reporter:  tibbe             |             Owner:
           Type:  bug               |            Status:  new
       Priority:  normal            |         Milestone:
      Component:  Compiler          |           Version:  7.6.3
       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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 unordered-containers uses lots of small arrays (length <= 16). These
 arrays are always allocated out-of-line by a call to `allocate`. I suspect
 this is bad for performance. We should look into supporting inline-
 allocation, perhaps by using a new `newSmallArray#` primop and/or by
 spotting calls to `newArray#` with a small, statically-known size.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8351>
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