1 files changed, 13 insertions, 0 deletions
diff --git a/llvm/lib/Target/RISCV/RISCVISelLowering.h b/llvm/lib/Target/RISCV/RISCVISelLowering.h
index 18fc7350bbbf..b2ad75d67024 100644
--- a/llvm/lib/Target/RISCV/RISCVISelLowering.h
+++ b/llvm/lib/Target/RISCV/RISCVISelLowering.h
@@ -147,6 +147,13 @@ public:
 
   bool shouldExtendTypeInLibCall(EVT Type) const override;
 
+  /// Returns the register with the specified architectural or ABI name. This
+  /// method is necessary to lower the llvm.read_register.* and
+  /// llvm.write_register.* intrinsics. Allocatable registers must be reserved
+  /// with the clang -ffixed-xX flag for access to be allowed.
+  Register getRegisterByName(const char *RegName, LLT VT,
+                             const MachineFunction &MF) const override;
+
 private:
   void analyzeInputArgs(MachineFunction &MF, CCState &CCInfo,
                         const SmallVectorImpl<ISD::InputArg> &Ins,
@@ -210,6 +217,12 @@ private:
                                    Value *AlignedAddr, Value *CmpVal,
                                    Value *NewVal, Value *Mask,
                                    AtomicOrdering Ord) const override;
+
+  /// Generate error diagnostics if any register used by CC has been marked
+  /// reserved.
+  void validateCCReservedRegs(
+      const SmallVectorImpl<std::pair<llvm::Register, llvm::SDValue>> &Regs,
+      MachineFunction &MF) const;
 };
 }