[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:  michalt
            Type:  feature request   |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  Compiler (LLVM)   |                 Version:  7.9
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  Runtime           |  Unknown/Multiple
  performance bug                    |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:
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Comment (by Ben Gamari <ben@…>):

 In [changeset:"b1d1c652908ecd7bfcf13cf2e5dd06ac7926992c/ghc"]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="b1d1c652908ecd7bfcf13cf2e5dd06ac7926992c"
 Support MO_{Add,Sub}IntC and MO_Add2 in the LLVM backend

 This includes:

 - Adding new LlvmType called LMStructP that represents an unpacked
   struct (this is necessary since LLVM's instructions the
   llvm.sadd.with.overflow.* return an unpacked struct).

 - Modifications to LlvmCodeGen.CodeGen to generate the LLVM
   instructions for the primops.

 - Modifications to StgCmmPrim to actually use those three instructions
   if we use the LLVM backend (so far they were only used for NCG).

 Test Plan: validate

 Reviewers: austin, rwbarton, bgamari

 Reviewed By: bgamari

 Subscribers: thomie, bgamari

 Differential Revision: https://phabricator.haskell.org/D991

 GHC Trac Issues: #9430
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9430#comment:5>
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