[GHC] #8724: unexpected CAS failures (was: CAS and Xchange in SMP.h don't use quadword instructions on x86_64 systems)

[GHC]

#8724: unexpected CAS failures
-------------------------------------+----------------------------------
        Reporter:  carter            |            Owner:
            Type:  bug               |           Status:  new
        Priority:  normal            |        Milestone:  7.8.1
       Component:  Compiler          |          Version:  7.8.1-rc1
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  x86_64 (amd64)
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
-------------------------------------+----------------------------------
Changes (by carter):

 * priority:  highest => normal


Comment:

 ok, looking at example gcc code, it appears that this patch doesn't change
 the code generated, so the bug understanding is still afoot.

 Also remains to be seen to understand the bug more

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8724#comment:1>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler