[GHC] #5598: Function quotRem is inefficient

[GHC]

#5598: Function quotRem is inefficient
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    Reporter:  boris                          |       Owner:  igloo                  
        Type:  task                           |      Status:  new                    
    Priority:  normal                         |   Milestone:  7.6.1                  
   Component:  Compiler                       |     Version:  7.0.3                  
    Keywords:  division, performance, primop  |          Os:  Unknown/Multiple       
Architecture:  x86                            |     Failure:  Runtime performance bug
  Difficulty:  Unknown                        |    Testcase:                         
   Blockedby:                                 |    Blocking:                         
     Related:                                 |  
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Changes (by igloo):

  * difficulty:  => Unknown


Comment:

 I had a look at this. It actually seemed simpler to me to just use a
 `MachOp` after all, and immediately assign the result. I also had to
 implement an `Assign2` constructor, and add a constructor to the `CmmType`
 type; is that what you intended?

 I've attached a patch with my attempt, although it only implements the new
 primop for the X86 NCG.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5598#comment:9>
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