[GHC] #8949: switch -msse2 to be on by default

[GHC]

#8949: switch -msse2 to be on by default
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        Reporter:  errge             |            Owner:
            Type:  bug               |           Status:  new
        Priority:  normal            |        Milestone:
       Component:  Compiler          |          Version:  7.9
  (CodeGen)                          |         Keywords:
      Resolution:                    |     Architecture:  x86
Operating System:  Unknown/Multiple  |       Difficulty:  Moderate (less
 Type of failure:  Other             |  than a day)
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Comment (by carter):

 Errge: I'd argue that changing the default needs to be predicated on
 adding march style machinery! There's enough stuff slated for 7.10 that
 would benefit from from ghc having more systematic support for micro arch
 selection feature flags that making msse2 the default on 32bit systems
 would miss the point of tst work.

 I also think that while it would touch more of ghc, such a patch wouldn't
 be much more complex.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8949#comment:4>
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