[GHC] #9251: ghc does not expose branchless max/min operations as primops

[GHC]

#9251: ghc does not expose branchless max/min operations as primops
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        Reporter:  carter            |                Owner:  osa1
            Type:  task              |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.8.2
      Resolution:                    |             Keywords:  newcomer
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Runtime           |  Unknown/Multiple
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #9246             |  Differential Rev(s):
       Wiki Page:                    |
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Changes (by AndreasK):

 * cc: AndreasK (added)


Comment:

 For cases where branch prediction is impossible this makes quite the
 difference in my experience.

 I have some proof of concept code for Int/Word already. I plan to keep the
 branch [here](https://github.com/AndreasPK/ghc/tree/minmax) updated until
 I got a patch ready.

 If someone feels like taking this over contact me, otherwise I will
 probably put up a patch for the Int/Word in a month or two depending on
 how time I can spend on this.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9251#comment:26>
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