diff --git a/clang/docs/LibASTMatchersReference.html b/clang/docs/LibASTMatchersReference.html
--- a/clang/docs/LibASTMatchersReference.html
+++ b/clang/docs/LibASTMatchersReference.html
@@ -2531,6 +2531,19 @@
 </pre></td></tr>
 
 
+<tr><td>Matcher&lt;<a href="https://clang.llvm.org/doxygen/classclang_1_1Type.html">Type</a>&gt;</td><td class="name" onclick="toggle('dependentSizedExtVectorType')"><a name="dependentSizedExtVectorType0Anchor">dependentSizedExtVectorType</a></td><td>Matcher&lt;<a href="https://clang.llvm.org/doxygen/classclang_1_1DependentSizedExtVectorType.html">DependentSizedExtVectorType</a>&gt;...</td></tr>
+<tr><td colspan="4" class="doc" id="dependentSizedExtVectorType0"><pre>Matches C++ extended vector type where either the type or size is dependent.
+
+Given
+  template&lt;typename T, int Size&gt;
+  class vector {
+    typedef T __attribute__((ext_vector_type(Size))) type;
+  };
+dependentSizedExtVectorType
+  matches "T __attribute__((ext_vector_type(Size)))"
+</pre></td></tr>
+
+
 <tr><td>Matcher&lt;<a href="https://clang.llvm.org/doxygen/classclang_1_1Type.html">Type</a>&gt;</td><td class="name" onclick="toggle('elaboratedType0')"><a name="elaboratedType0Anchor">elaboratedType</a></td><td>Matcher&lt;<a href="https://clang.llvm.org/doxygen/classclang_1_1ElaboratedType.html">ElaboratedType</a>&gt;...</td></tr>
 <tr><td colspan="4" class="doc" id="elaboratedType0"><pre>Matches types specified with an elaborated type keyword or with a
 qualified name.
diff --git a/clang/docs/ReleaseNotes.rst b/clang/docs/ReleaseNotes.rst
--- a/clang/docs/ReleaseNotes.rst
+++ b/clang/docs/ReleaseNotes.rst
@@ -231,6 +231,7 @@
 
 AST Matchers
 ------------
+- Add ``dependentSizedExtVectorType``.
 
 clang-format
 ------------
diff --git a/clang/include/clang/ASTMatchers/ASTMatchers.h b/clang/include/clang/ASTMatchers/ASTMatchers.h
--- a/clang/include/clang/ASTMatchers/ASTMatchers.h
+++ b/clang/include/clang/ASTMatchers/ASTMatchers.h
@@ -6938,6 +6938,21 @@
 ///   matches "T data[Size]"
 extern const AstTypeMatcher<DependentSizedArrayType> dependentSizedArrayType;
 
+/// Matches C++ extended vector type where either the type or size is
+/// dependent.
+///
+/// Given
+/// \code
+///   template<typename T, int Size>
+///   class vector {
+///     typedef T __attribute__((ext_vector_type(Size))) type;
+///   };
+/// \endcode
+/// dependentSizedExtVectorType
+///   matches "T __attribute__((ext_vector_type(Size)))"
+extern const AstTypeMatcher<DependentSizedExtVectorType>
+    dependentSizedExtVectorType;
+
 /// Matches C arrays with unspecified size.
 ///
 /// Given
diff --git a/clang/lib/ASTMatchers/ASTMatchersInternal.cpp b/clang/lib/ASTMatchers/ASTMatchersInternal.cpp
--- a/clang/lib/ASTMatchers/ASTMatchersInternal.cpp
+++ b/clang/lib/ASTMatchers/ASTMatchersInternal.cpp
@@ -1046,6 +1046,7 @@
 const AstTypeMatcher<DeducedTemplateSpecializationType>
     deducedTemplateSpecializationType;
 const AstTypeMatcher<DependentSizedArrayType> dependentSizedArrayType;
+const AstTypeMatcher<DependentSizedExtVectorType> dependentSizedExtVectorType;
 const AstTypeMatcher<IncompleteArrayType> incompleteArrayType;
 const AstTypeMatcher<VariableArrayType> variableArrayType;
 const AstTypeMatcher<AtomicType> atomicType;
diff --git a/clang/lib/ASTMatchers/Dynamic/Registry.cpp b/clang/lib/ASTMatchers/Dynamic/Registry.cpp
--- a/clang/lib/ASTMatchers/Dynamic/Registry.cpp
+++ b/clang/lib/ASTMatchers/Dynamic/Registry.cpp
@@ -227,6 +227,7 @@
   REGISTER_MATCHER(defaultStmt);
   REGISTER_MATCHER(dependentCoawaitExpr);
   REGISTER_MATCHER(dependentSizedArrayType);
+  REGISTER_MATCHER(dependentSizedExtVectorType);
   REGISTER_MATCHER(designatedInitExpr);
   REGISTER_MATCHER(designatorCountIs);
   REGISTER_MATCHER(doStmt);
diff --git a/clang/unittests/ASTMatchers/ASTMatchersNodeTest.cpp b/clang/unittests/ASTMatchers/ASTMatchersNodeTest.cpp
--- a/clang/unittests/ASTMatchers/ASTMatchersNodeTest.cpp
+++ b/clang/unittests/ASTMatchers/ASTMatchersNodeTest.cpp
@@ -1560,6 +1560,20 @@
                  dependentSizedArrayType()));
 }
 
+TEST_P(ASTMatchersTest, DependentSizedExtVectorType) {
+  if (!GetParam().isCXX()) {
+    return;
+  }
+  EXPECT_TRUE(matches("template<typename T, int Size>"
+                      "class vector {"
+                      "  typedef T __attribute__((ext_vector_type(Size))) type;"
+                      "};",
+                      dependentSizedExtVectorType()));
+  EXPECT_TRUE(
+      notMatches("int a[42]; int b[] = { 2, 3 }; void f() { int c[b[0]]; }",
+                 dependentSizedExtVectorType()));
+}
+
 TEST_P(ASTMatchersTest, IncompleteArrayType) {
   EXPECT_TRUE(matches("int a[] = { 2, 3 };", incompleteArrayType()));
   EXPECT_TRUE(matches("void f(int a[]) {}", incompleteArrayType()));