[GHC] #11143: Feature request: Add index/read/write primops with byte offset for ByteArray#

[GHC]

#11143: Feature request: Add index/read/write primops with byte offset for
ByteArray#
-------------------------------------+-------------------------------------
        Reporter:  vagarenko         |                Owner:  sjakobi
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.10.2
      Resolution:                    |             Keywords:  newcomers
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Runtime           |  Unknown/Multiple
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D4433
       Wiki Page:                    |
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Changes (by sjakobi):

 * cc: sjakobi (removed)
 * owner:  (none) => sjakobi
 * differential:   => Phab:D4433


Comment:

 I have implemented a first primop which was much less code than I had
 expected. Please review the attached Phab.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11143#comment:6>
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