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a2ed0e8e8b
This is mostly documentation for the new machine model. It is designed to be flexible, easy to incrementally refine for a subtarget, and provide all the information that MachineScheduler will need. If all goes well, I will follow up with an example of the new model in use for ARM. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@163877 91177308-0d34-0410-b5e6-96231b3b80d8