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ba1a3df608
to be really bad. Once they are joined they are not broken apart. Also, physical intervals cannot be spilled! Added a heuristic as a workaround for this. Be careful coalescing with a physical register if the virtual register uses are "far". Check if there are uses in the same loop as the source (copy instruction). Check if it is in the loop preheader, etc. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35134 91177308-0d34-0410-b5e6-96231b3b80d8
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