[GHC] #10074: Implement the 'Improved LLVM Backend' proposal

[GHC]

#10074: Implement the 'Improved LLVM Backend' proposal
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        Reporter:  thoughtpolice     |                Owner:  thoughtpolice
            Type:  task              |               Status:  new
        Priority:  high              |            Milestone:  8.4.1
       Component:  Compiler (LLVM)   |              Version:
      Resolution:                    |             Keywords:  llvm, codegen
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #11295, #12470    |  Differential Rev(s):  Phab:D530
       Wiki Page:                    |
  wiki:ImprovedLLVMBackend           |
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Comment (by angerman):

 Replying to [comment:9 dobenour]:
 > I think that we should run loop unswitching early in the pipeline, to
 remove redundant heap/stack checks.
 >
 > How can we track aliasing information better?
 >
 > LLVM supports dereferencable annotations.  Those might be able to help.
 The Data.Bitcode stuff I wrote doesn't need the aliasing anymore.  However
 another option would be to teach cmm lable types or not take of from cmm,
 but stg.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10074#comment:10>
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