[llvm] [PATCH] [Xtensa] Implement FrameLowering methods and stack operation lowering. (PR #92960)

[Matt Arsenault via llvm-commits]

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@@ -33,6 +33,70 @@ bool XtensaFrameLowering::hasFP(const MachineFunction &MF) const {
          MFI.hasVarSizedObjects();
 }
 
+#ifndef NDEBUG
+/* Check whether instruction I stores some callee-saved register from CSI
+ */
+static bool checkStoreInstruction(MachineBasicBlock::iterator I,
+                                  const std::vector<CalleeSavedInfo> &CSI) {
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arsenm wrote:

If you're relying on seeing these exact instructions, it's OK to rely on the order. The point of the assert was to verify the instructions exactly match what you expected, which includes the order 

https://github.com/llvm/llvm-project/pull/92960