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265058d923
This adds the -join-globalcopies option which can be enabled by default once misched is also enabled. Ideally, the register coalescer would be able to split local live ranges in a way that produces copies that can be easily resolved by the scheduler. Until then, this heuristic should be good enough to at least allow the scheduler to run after coalescing. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@167825 91177308-0d34-0410-b5e6-96231b3b80d8
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