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

GHC ghc-devs at haskell.org
Fri Oct 5 02:23:06 UTC 2018


#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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Comment (by bgamari):

 Well, implementing then measuring (and accept the fact that the
 implementation may be thrown away as a consequence) is one option.

 However, another option would be to work incrementally: measuring a best-
 case speed-up in a C (or similar) program.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9251#comment:25>
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