diff --git a/clang/utils/TableGen/RISCVVEmitter.cpp b/clang/utils/TableGen/RISCVVEmitter.cpp
--- a/clang/utils/TableGen/RISCVVEmitter.cpp
+++ b/clang/utils/TableGen/RISCVVEmitter.cpp
@@ -235,9 +235,6 @@
                                   ArrayRef<std::string> PrototypeSeq);
   Optional<RVVTypePtr> computeType(BasicType BT, int Log2LMUL, StringRef Proto);
 
-  // Emit the architecture preprocessor definitions. Return true when emits
-  // non-empty string.
-  bool emitExtDefStr(uint8_t Extensions, raw_ostream &o);
   // Slice Prototypes string into sub prototype string and process each sub
   // prototype string individually in the Handler.
   void parsePrototypes(StringRef Prototypes,
@@ -1118,23 +1115,6 @@
   return llvm::None;
 }
 
-bool RVVEmitter::emitExtDefStr(uint8_t Extents, raw_ostream &OS) {
-  if (Extents == RISCVExtension::Basic)
-    return false;
-  OS << "#if ";
-  ListSeparator LS(" && ");
-  if (Extents & RISCVExtension::F)
-    OS << LS << "defined(__riscv_f)";
-  if (Extents & RISCVExtension::D)
-    OS << LS << "defined(__riscv_d)";
-  if (Extents & RISCVExtension::Zfh)
-    OS << LS << "defined(__riscv_zfh)";
-  if (Extents & RISCVExtension::Zvamo)
-    OS << LS << "defined(__riscv_zvamo)";
-  OS << "\n";
-  return true;
-}
-
 static void emitFeatureCheckStr(uint8_t Extents, raw_ostream &OS) {
   if (Extents == RISCVExtension::Basic) {
     OS << 0;