diff --git a/llvm/include/llvm/CodeGen/MachineRegisterInfo.h b/llvm/include/llvm/CodeGen/MachineRegisterInfo.h
index 3f0fc160f9ea4..09d9a0b4ec402 100644
--- a/llvm/include/llvm/CodeGen/MachineRegisterInfo.h
+++ b/llvm/include/llvm/CodeGen/MachineRegisterInfo.h
@@ -243,15 +243,6 @@ class MachineRegisterInfo {
   /// Returns true if the updated CSR list was initialized and false otherwise.
   bool isUpdatedCSRsInitialized() const { return IsUpdatedCSRsInitialized; }
 
-  /// Returns true if a register can be used as an argument to a function.
-  bool isArgumentRegister(MCRegister Reg) const;
-
-  /// Returns true if a register is a fixed register.
-  bool isFixedRegister(MCRegister Reg) const;
-
-  /// Returns true if a register is a general purpose register.
-  bool isGeneralPurposeRegister(MCRegister Reg) const;
-
   /// Disables the register from the list of CSRs.
   /// I.e. the register will not appear as part of the CSR mask.
   /// \see UpdatedCalleeSavedRegs.
diff --git a/llvm/lib/CodeGen/MachineRegisterInfo.cpp b/llvm/lib/CodeGen/MachineRegisterInfo.cpp
index 55d7c8370e9c4..b0c1838b3ff0e 100644
--- a/llvm/lib/CodeGen/MachineRegisterInfo.cpp
+++ b/llvm/lib/CodeGen/MachineRegisterInfo.cpp
@@ -659,15 +659,3 @@ bool MachineRegisterInfo::isReservedRegUnit(unsigned Unit) const {
   }
   return false;
 }
-
-bool MachineRegisterInfo::isArgumentRegister(MCRegister Reg) const {
-  return getTargetRegisterInfo()->isArgumentRegister(*MF, Reg);
-}
-
-bool MachineRegisterInfo::isFixedRegister(MCRegister Reg) const {
-  return getTargetRegisterInfo()->isFixedRegister(*MF, Reg);
-}
-
-bool MachineRegisterInfo::isGeneralPurposeRegister(MCRegister Reg) const {
-  return getTargetRegisterInfo()->isGeneralPurposeRegister(*MF, Reg);
-}