[GHC] #7684: cgrun071 segfaults

[GHC]

#7684: cgrun071 segfaults
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        Reporter:  tibbe          |            Owner:
            Type:  bug            |           Status:  new
        Priority:  normal         |        Milestone:  7.8.1
       Component:  Compiler       |          Version:  7.7
      Resolution:                 |         Keywords:
Operating System:  MacOS X        |     Architecture:  x86_64 (amd64)
 Type of failure:  Runtime crash  |       Difficulty:  Unknown
       Test Case:  cgrun071       |       Blocked By:
        Blocking:                 |  Related Tickets:
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Comment (by tibbe):

 I don't want to fix anything without understanding what the problem is
 first. There's nothing wrong with

 {{{
 extern StgWord hs_popcnt8(StgWord8 x);
 }}}

 so why is the compiler doing the wrong thing?

 Aside: if we can one day fix Word8 to actually use a Word8# behind the
 scene changing the signature of the C function would be wrong.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7684#comment:34>
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