[GHC] #9430: implement more arithmetic operations natively in the LLVM backend

[GHC]

#9430: implement more arithmetic operations natively in the LLVM backend
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        Reporter:  rwbarton          |                   Owner:  michalt
            Type:  feature request   |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  Compiler (LLVM)   |                 Version:  7.9
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Runtime           |               Test Case:
  performance bug                    |  primops/should_run/T9430
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:
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Comment (by bgamari):

 Here is the current state of things as I understand them.

 ||= MachOp        =||= LLVM construct             =||= commit     =||
 || MO_Add2         || @llvm.uadd.with.overflow.*   ||
 b1d1c652908ecd7bfcf13cf2e5dd06ac7926992c/ghc ||
 || MO_AddIntC      || @llvm.sadd.with.overflow.*   ||
 b1d1c652908ecd7bfcf13cf2e5dd06ac7926992c/ghc ||
 || MO_SubIntC      || @llvm.ssub.with.overflow.*   ||
 b1d1c652908ecd7bfcf13cf2e5dd06ac7926992c/ghc ||
 || MO_U_Mul2       || mul i64/i128?                || TODO ||
 || MO_U_QuotRem2   || udiv i64/i128?               ||
 92f5385d8b2be50848a2496199a481f299f4b53a/ghc ||

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9430#comment:14>
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