[PATCH] D133213: [LLVM][AArch64] Explain that X19 is used as the frame base pointer register

[Thorsten via Phabricator via llvm-commits]

tschuett added inline comments.


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Comment at: llvm/include/llvm/CodeGen/TargetRegisterInfo.h:528
+  /// why the given register is reserved for the given machine function.
+  virtual const char *explainReservedReg(const MachineFunction &MF,
+                                         MCRegister PhysReg) const {
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You could use an `Optional<std::string>` instead. It will be seldom used.


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  https://reviews.llvm.org/D133213/new/

https://reviews.llvm.org/D133213