diff --git a/clang/docs/LibASTMatchersReference.html b/clang/docs/LibASTMatchersReference.html
--- a/clang/docs/LibASTMatchersReference.html
+++ b/clang/docs/LibASTMatchersReference.html
@@ -1491,6 +1491,11 @@
 </pre></td></tr>
 
 
+<tr><td>Matcher&lt;<a href="https://clang.llvm.org/doxygen/classclang_1_1Stmt.html">Stmt</a>&gt;</td><td class="name" onclick="toggle('convertVectorExpr0')"><a name="convertVectorExpr0Anchor">convertVectorExpr</a></td><td>Matcher&lt;<a href="https://clang.llvm.org/doxygen/classclang_1_1ConvertVectorExpr.html">ConvertVectorExpr</a>&gt;...</td></tr>
+<tr><td colspan="4" class="doc" id="convertVectorExpr0"><pre>Matches builtin function __builtin_convertvector.
+</pre></td></tr>
+
+
 <tr><td>Matcher&lt;<a href="https://clang.llvm.org/doxygen/classclang_1_1Stmt.html">Stmt</a>&gt;</td><td class="name" onclick="toggle('coreturnStmt0')"><a name="coreturnStmt0Anchor">coreturnStmt</a></td><td>Matcher&lt;<a href="https://clang.llvm.org/doxygen/classclang_1_1CoreturnStmt.html">CoreturnStmt</a>&gt;...</td></tr>
 <tr><td colspan="4" class="doc" id="coreturnStmt0"><pre>Matches co_return statements.
 
diff --git a/clang/docs/ReleaseNotes.rst b/clang/docs/ReleaseNotes.rst
--- a/clang/docs/ReleaseNotes.rst
+++ b/clang/docs/ReleaseNotes.rst
@@ -228,6 +228,7 @@
 
 AST Matchers
 ------------
+- Add ``convertVectorExpr``.
 
 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
@@ -2519,6 +2519,10 @@
 extern const internal::VariadicDynCastAllOfMatcher<Stmt, ChooseExpr>
     chooseExpr;
 
+/// Matches builtin function __builtin_convertvector.
+extern const internal::VariadicDynCastAllOfMatcher<Stmt, ConvertVectorExpr>
+    convertVectorExpr;
+
 /// Matches GNU __null expression.
 extern const internal::VariadicDynCastAllOfMatcher<Stmt, GNUNullExpr>
     gnuNullExpr;
diff --git a/clang/lib/AST/ASTImporter.cpp b/clang/lib/AST/ASTImporter.cpp
--- a/clang/lib/AST/ASTImporter.cpp
+++ b/clang/lib/AST/ASTImporter.cpp
@@ -615,6 +615,7 @@
     ExpectedStmt VisitSourceLocExpr(SourceLocExpr *E);
     ExpectedStmt VisitVAArgExpr(VAArgExpr *E);
     ExpectedStmt VisitChooseExpr(ChooseExpr *E);
+    ExpectedStmt VisitConvertVectorExpr(ConvertVectorExpr *E);
     ExpectedStmt VisitShuffleVectorExpr(ShuffleVectorExpr *E);
     ExpectedStmt VisitGNUNullExpr(GNUNullExpr *E);
     ExpectedStmt VisitGenericSelectionExpr(GenericSelectionExpr *E);
@@ -7038,6 +7039,21 @@
                  ToRParenLoc, CondIsTrue);
 }
 
+ExpectedStmt ASTNodeImporter::VisitConvertVectorExpr(ConvertVectorExpr *E) {
+  Error Err = Error::success();
+  auto *ToSrcExpr = importChecked(Err, E->getSrcExpr());
+  auto ToRParenLoc = importChecked(Err, E->getRParenLoc());
+  auto ToBuiltinLoc = importChecked(Err, E->getBuiltinLoc());
+  auto ToType = importChecked(Err, E->getType());
+  auto *ToTSI = importChecked(Err, E->getTypeSourceInfo());
+  if (Err)
+    return std::move(Err);
+
+  return new (Importer.getToContext())
+      ConvertVectorExpr(ToSrcExpr, ToTSI, ToType, E->getValueKind(),
+                        E->getObjectKind(), ToBuiltinLoc, ToRParenLoc);
+}
+
 ExpectedStmt ASTNodeImporter::VisitShuffleVectorExpr(ShuffleVectorExpr *E) {
   Error Err = Error::success();
   auto ToRParenLoc = importChecked(Err, E->getRParenLoc());
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
@@ -941,6 +941,8 @@
 const internal::VariadicDynCastAllOfMatcher<Stmt, CXXNullPtrLiteralExpr>
     cxxNullPtrLiteralExpr;
 const internal::VariadicDynCastAllOfMatcher<Stmt, ChooseExpr> chooseExpr;
+const internal::VariadicDynCastAllOfMatcher<Stmt, ConvertVectorExpr>
+    convertVectorExpr;
 const internal::VariadicDynCastAllOfMatcher<Stmt, CoawaitExpr>
     coawaitExpr;
 const internal::VariadicDynCastAllOfMatcher<Stmt, DependentCoawaitExpr>
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
@@ -178,6 +178,7 @@
   REGISTER_MATCHER(constantExpr);
   REGISTER_MATCHER(containsDeclaration);
   REGISTER_MATCHER(continueStmt);
+  REGISTER_MATCHER(convertVectorExpr);
   REGISTER_MATCHER(coreturnStmt);
   REGISTER_MATCHER(coroutineBodyStmt);
   REGISTER_MATCHER(coyieldExpr);
diff --git a/clang/unittests/AST/ASTImporterTest.cpp b/clang/unittests/AST/ASTImporterTest.cpp
--- a/clang/unittests/AST/ASTImporterTest.cpp
+++ b/clang/unittests/AST/ASTImporterTest.cpp
@@ -1295,6 +1295,29 @@
             ToChooseExpr->isConditionDependent());
 }
 
+TEST_P(ASTImporterOptionSpecificTestBase, ImportConvertVectorExpr) {
+  Decl *From, *To;
+  std::tie(From, To) = getImportedDecl(
+      "typedef double v4double __attribute__((__vector_size__(32)));"
+      "typedef float  v4float  __attribute__((__vector_size__(16)));"
+      "v4float vf;"
+      "void declToImport() { (void)__builtin_convertvector(vf, v4double); }",
+      Lang_CXX03, "", Lang_CXX03);
+
+  auto ToResults =
+      match(convertVectorExpr().bind("convert"), To->getASTContext());
+  auto FromResults =
+      match(convertVectorExpr().bind("convert"), From->getASTContext());
+
+  const ConvertVectorExpr *FromConvertVectorExpr =
+      selectFirst<ConvertVectorExpr>("convert", FromResults);
+  ASSERT_TRUE(FromConvertVectorExpr);
+
+  const ConvertVectorExpr *ToConvertVectorExpr =
+      selectFirst<ConvertVectorExpr>("convert", ToResults);
+  ASSERT_TRUE(ToConvertVectorExpr);
+}
+
 TEST_P(ASTImporterOptionSpecificTestBase, ImportGenericSelectionExpr) {
   Decl *From, *To;
   std::tie(From, To) = getImportedDecl(
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
@@ -986,6 +986,17 @@
                       chooseExpr()));
 }
 
+TEST_P(ASTMatchersTest, ConvertVectorExpr) {
+  EXPECT_TRUE(matches(
+      "typedef double vector4double __attribute__((__vector_size__(32)));"
+      "typedef float  vector4float  __attribute__((__vector_size__(16)));"
+      "vector4float vf;"
+      "void f() { (void)__builtin_convertvector(vf, vector4double); }",
+      convertVectorExpr()));
+  EXPECT_TRUE(notMatches("void f() { (void)__builtin_choose_expr(1, 2, 3); }",
+                         convertVectorExpr()));
+}
+
 TEST_P(ASTMatchersTest, GNUNullExpr) {
   if (!GetParam().isCXX()) {
     return;