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The previous MRI.isPhysRegUsed(YMM0) would also return true when the function contains a call to a function that may clobber YMM0. That's most of them. Checking the use-def chains allows us to skip functions that don't explicitly mention YMM registers. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166110 91177308-0d34-0410-b5e6-96231b3b80d8
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