[llvm] [aarch64] XOR the frame pointer with the stack cookie when protecting the stack (PR #161114)

[Eli Friedman via llvm-commits]

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@@ -959,6 +961,18 @@ bool AArch64DAGToDAGISel::SelectRDSVLShiftImm(SDValue N, SDValue &Imm) {
   return false;
 }
 
+/// SelectAddUXTXRegister - Select a "UXTX register" operand. This
+/// operand is referred by the instructions have SP operand
+bool AArch64DAGToDAGISel::SelectAddUXTXRegister(SDValue N, SDValue &Reg,
+                                                SDValue &Shift) {
+  if (N.getOpcode() != ISD::LOAD)
+    return false;
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efriedma-quic wrote:

Is there any particular reason to check for a LOAD?  The pattern seems like it should still work for non-LOAD operands.

https://github.com/llvm/llvm-project/pull/161114