Jakob Stoklund Olesen 9d57cdfa17 Check for empty YMM use-def lists in X86VZeroUpper. ...

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

2012-10-17 17:52:35 +00:00

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