diff --git a/llvm/include/llvm/CodeGen/TargetInstrInfo.h b/llvm/include/llvm/CodeGen/TargetInstrInfo.h
--- a/llvm/include/llvm/CodeGen/TargetInstrInfo.h
+++ b/llvm/include/llvm/CodeGen/TargetInstrInfo.h
@@ -1190,8 +1190,6 @@
                                      MachineInstr &NewMI1,
                                      MachineInstr &NewMI2) const {}
 
-  virtual void setSpecialOperandAttr(MachineInstr &MI, uint16_t Flags) const {}
-
   /// Return true when a target supports MachineCombiner.
   virtual bool useMachineCombiner() const { return false; }
 
diff --git a/llvm/lib/Target/PowerPC/PPCInstrInfo.h b/llvm/lib/Target/PowerPC/PPCInstrInfo.h
--- a/llvm/lib/Target/PowerPC/PPCInstrInfo.h
+++ b/llvm/lib/Target/PowerPC/PPCInstrInfo.h
@@ -393,7 +393,9 @@
                              MachineInstr &NewMI1,
                              MachineInstr &NewMI2) const override;
 
-  void setSpecialOperandAttr(MachineInstr &MI, uint16_t Flags) const override;
+  // PowerPC specific version of setSpecialOperandAttr that copies Flags to MI
+  // and clears nuw, nsw, and exact flags.
+  void setSpecialOperandAttr(MachineInstr &MI, uint16_t Flags) const;
 
   bool isCoalescableExtInstr(const MachineInstr &MI,
                              Register &SrcReg, Register &DstReg,