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

[GHC]

#9430: implement more arithmetic operations natively in the LLVM backend
-------------------------------------+-------------------------------------
       Reporter:  rwbarton           |                   Owner:
           Type:  feature request    |                  Status:  new
       Priority:  normal             |               Milestone:
      Component:  Compiler (LLVM)    |                 Version:  7.9
       Keywords:                     |        Operating System:
   Architecture:  Unknown/Multiple   |  Unknown/Multiple
     Difficulty:  Moderate (less     |         Type of failure:  Runtime
  than a day)                        |  performance bug
     Blocked By:                     |               Test Case:
Related Tickets:                     |                Blocking:
                                     |  Differential Revisions:
-------------------------------------+-------------------------------------
 There are a number of arithmetic operations that have native
 implementations on x86 but use the generic fallback on LLVM. Implementing
 these with LLVM intrinsics could improve small Integer performance on ARM
 substantially!
 {{{
 MO_Add2         @llvm.uadd.with.overflow.*
 MO_AddIntC      @llvm.sadd.with.overflow.*
 MO_SubIntC      @llvm.ssub.with.overflow.*
 MO_U_Mul2       mul i64/i128?
 MO_U_QuotRem2   udiv i64/i128?
 }}}

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