[GHC] #9661: Branchless ==# is compiled to branchy code

[GHC]

#9661: Branchless ==# is compiled to branchy code
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              Reporter:  dfeuer      |            Owner:
                  Type:  feature     |           Status:  new
  request                            |        Milestone:
              Priority:  normal      |          Version:  7.9
             Component:  Compiler    |         Keywords:
            Resolution:              |     Architecture:  Unknown/Multiple
      Operating System:              |       Difficulty:  Unknown
  Unknown/Multiple                   |       Blocked By:
       Type of failure:  Runtime     |  Related Tickets:
  performance bug                    |
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
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Comment (by dfeuer):

 Replying to [comment:9 rwbarton]:
 > I don't understand what `bartonEq` or `feuerEq` is or what the
 difference between them is supposed to be. They look equal to me.

 You're right. I got confused. Sorry. I still think we should have that
 `secretEq#` that acts the same as `==#` but without the `litEq`
 modification. I'm not the one to come up with a good justification—all I
 want it for at the moment is `isSpace`, whicn is not exactly a hotspot in
 most code.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9661#comment:11>
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