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Such edges are zero matrix, and they bring no additional info to the allocation problem, apart from contributing to nodes' degree. Removing those edges is expected to improve allocation time. Tune the spill cost comparison, as this gives better average performances now that the nodes' degrees has changed. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@230904 91177308-0d34-0410-b5e6-96231b3b80d8
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