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b0cacfc25f
Because it was a callee-saved register, we automatically generated code to spill and unspill its original value so that it is restored after the function returns. The problem is that this code was being generated before the epilogue. The epilogue itself uses the Y register, which could be prematurely restored by the CSR restoration process. This removes R29R28 from the CSR list and changes the prologue/epilogue code to handle it explicitly. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@301887 91177308-0d34-0410-b5e6-96231b3b80d8
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