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Add a note about x86 register coallescing
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26920 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -644,3 +644,5 @@ void minf(float a, float b, float *X) {
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//===---------------------------------------------------------------------===//
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Teach the coallescer to coales vregs of different register classes. e.g. FR32 /
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FR64 to VR128.
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