[GHC] #4442: Add unaligned version of indexWordArray#

[GHC]

#4442: Add unaligned version of indexWordArray#
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    Reporter:  tibbe              |        Owner:              
        Type:  feature request    |       Status:  new         
    Priority:  normal             |    Milestone:              
   Component:  libraries (other)  |      Version:  7.1         
    Keywords:                     |     Testcase:              
   Blockedby:                     |   Difficulty:              
          Os:  Unknown/Multiple   |     Blocking:              
Architecture:  Unknown/Multiple   |      Failure:  None/Unknown
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Comment(by tibbe):

 Replying to [comment:1 simonmar]:
 > As per discussion on glasgow-haskell-users, this can be done with a
 combination of `byteArrayContents#`, `plusAddr#`, `indexWordOffAddr#`, and
 `touch#`.  Does that work well enough for your purposes?
 That only works if the array is pinned.

 Simon suggested that we could replace the current primops with ones that
 take byte offsets and implement the current set of primops in terms of
 these, new primops.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4442#comment:2>
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