Index: clang/include/clang/Basic/Builtins.def
===================================================================
--- clang/include/clang/Basic/Builtins.def
+++ clang/include/clang/Basic/Builtins.def
@@ -648,6 +648,7 @@
 BUILTIN(__builtin_elementwise_min, "v.", "nct")
 BUILTIN(__builtin_reduce_max, "v.", "nct")
 BUILTIN(__builtin_reduce_min, "v.", "nct")
+BUILTIN(__builtin_reduce_xor, "v.", "nct")
 
 BUILTIN(__builtin_matrix_transpose, "v.", "nFt")
 BUILTIN(__builtin_matrix_column_major_load, "v.", "nFt")
Index: clang/include/clang/Basic/DiagnosticSemaKinds.td
===================================================================
--- clang/include/clang/Basic/DiagnosticSemaKinds.td
+++ clang/include/clang/Basic/DiagnosticSemaKinds.td
@@ -11356,7 +11356,8 @@
   "%ordinal0 argument must be a "
   "%select{vector, integer or floating point type|matrix|"
    "pointer to a valid matrix element type|"
-   "signed integer or floating point type|vector type}1 (was %2)">;
+   "signed integer or floating point type|vector type|"
+   "vector of integers type}1 (was %2)">;
 
 def err_builtin_matrix_disabled: Error<
   "matrix types extension is disabled. Pass -fenable-matrix to enable it">;
Index: clang/lib/CodeGen/CGBuiltin.cpp
===================================================================
--- clang/lib/CodeGen/CGBuiltin.cpp
+++ clang/lib/CodeGen/CGBuiltin.cpp
@@ -3204,6 +3204,13 @@
     return RValue::get(Result);
   }
 
+  case Builtin::BI__builtin_reduce_xor: {
+    Value *Op0 = EmitScalarExpr(E->getArg(0));
+    Value *Result = Builder.CreateUnaryIntrinsic(
+        llvm::Intrinsic::vector_reduce_xor, Op0, nullptr, "rdx.xor");
+    return RValue::get(Result);
+  }
+
   case Builtin::BI__builtin_matrix_transpose: {
     const auto *MatrixTy = E->getArg(0)->getType()->getAs<ConstantMatrixType>();
     Value *MatValue = EmitScalarExpr(E->getArg(0));
Index: clang/lib/Sema/SemaChecking.cpp
===================================================================
--- clang/lib/Sema/SemaChecking.cpp
+++ clang/lib/Sema/SemaChecking.cpp
@@ -2112,6 +2112,25 @@
     if (SemaBuiltinReduceMath(TheCall))
       return ExprError();
     break;
+
+  // __builtin_reduce_xor restricts the element type to vector of integers type
+  // only.
+  case Builtin::BI__builtin_reduce_xor: {
+    if (SemaBuiltinReduceMath(TheCall))
+      return ExprError();
+
+    const auto *Arg = TheCall->getArg(0);
+    if (!Arg->getType()
+             ->getAs<VectorType>()
+             ->getElementType()
+             ->isIntegerType()) {
+      Diag(Arg->getBeginLoc(), diag::err_builtin_invalid_arg_type)
+          << 1 /* vector of integers */ << 5 << Arg->getType();
+      return ExprError();
+    }
+    break;
+  }
+
   case Builtin::BI__builtin_matrix_transpose:
     return SemaBuiltinMatrixTranspose(TheCall, TheCallResult);
 
Index: clang/test/CodeGen/builtins-reduction-math.c
===================================================================
--- clang/test/CodeGen/builtins-reduction-math.c
+++ clang/test/CodeGen/builtins-reduction-math.c
@@ -57,3 +57,14 @@
   const si8 cvi1 = vi1;
   unsigned long long r5 = __builtin_reduce_min(cvi1);
 }
+
+void test_builtin_reduce_xor(si8 vi1, u4 vu1) {
+
+  // CHECK:      [[VI1:%.+]] = load <8 x i16>, <8 x i16>* %vi1.addr, align 16
+  // CHECK-NEXT: call i16 @llvm.vector.reduce.xor.v8i16(<8 x i16> [[VI1]])
+  short r2 = __builtin_reduce_xor(vi1);
+
+  // CHECK:      [[VU1:%.+]] = load <4 x i32>, <4 x i32>* %vu1.addr, align 16
+  // CHECK-NEXT: call i32 @llvm.vector.reduce.xor.v4i32(<4 x i32> [[VU1]])
+  unsigned r3 = __builtin_reduce_xor(vu1);
+}
Index: clang/test/Sema/builtins-reduction-math.c
===================================================================
--- clang/test/Sema/builtins-reduction-math.c
+++ clang/test/Sema/builtins-reduction-math.c
@@ -35,3 +35,20 @@
   i = __builtin_reduce_min(i);
   // expected-error@-1 {{1st argument must be a vector type (was 'int')}}
 }
+
+void test_builtin_reduce_xor(int i, float4 v, int3 iv) {
+  struct Foo s = __builtin_reduce_xor(iv);
+  // expected-error@-1 {{initializing 'struct Foo' with an expression of incompatible type 'int'}}
+
+  i = __builtin_reduce_xor();
+  // expected-error@-1 {{too few arguments to function call, expected 1, have 0}}
+
+  i = __builtin_reduce_xor(iv, iv);
+  // expected-error@-1 {{too many arguments to function call, expected 1, have 2}}
+
+  i = __builtin_reduce_xor(i);
+  // expected-error@-1 {{1st argument must be a vector of integers type (was 'int')}}
+
+  i = __builtin_reduce_xor(v);
+  // expected-error@-1 {{1st argument must be a vector of integers type (was 'float4' (vector of 4 'float' values))}}
+}