[GHC] #16052: Core optimizations for memset on a small range

[GHC]

#16052: Core optimizations for memset on a small range
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        Reporter:  andrewthad        |                Owner:  (none)
            Type:  task              |               Status:  new
        Priority:  normal            |            Milestone:  8.9
       Component:  Compiler          |              Version:  8.6.3
      Resolution:                    |             Keywords:  newcomer
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by bgamari):

 > As far as I can tell, the condition is that the length of the region is
 less than 128 and that the memory is four-byte aligned. If anything, this
 condition seems too weak on 64-bit platforms (but correct on 32-bit
 platforms). I don’t know how the NCG normally deals with the 32 bit vs 64
 bit distinction in other places.

 We could use sub-word-sized stores in the case of non-aligned offsets.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16052#comment:5>
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