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PR24139 contains an analysis of poor register allocation. One of the findings was that when calculating the spill weight, a rematerializable interval once split is no longer rematerializable. This is because the isRematerializable check in CalcSpillWeights.cpp does not follow the copies introduced by live range splitting (after splitting, the live interval register definition is a copy which is not rematerializable). Reviewers: qcolombet Differential Revision: http://reviews.llvm.org/D11686 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@244439 91177308-0d34-0410-b5e6-96231b3b80d8
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