diff --git a/clang/docs/LanguageExtensions.rst b/clang/docs/LanguageExtensions.rst
--- a/clang/docs/LanguageExtensions.rst
+++ b/clang/docs/LanguageExtensions.rst
@@ -475,7 +475,7 @@
 +,--,*,/,%                       yes     yes       yes         --
 bitwise operators &,|,^,~        yes     yes       yes         --
 >>,<<                            yes     yes       yes         --
-!, &&, ||                        yes     --        yes [#]_    --
+!, &&, ||                        yes     --        yes         --
 ==, !=, >, <, >=, <=             yes     yes       yes         --
 =                                yes     yes       yes         yes
 ?: [#]_                          yes     --        yes         --
@@ -488,7 +488,6 @@
 
 See also :ref:`langext-__builtin_shufflevector`, :ref:`langext-__builtin_convertvector`.
 
-.. [#] unary operator ! is not implemented, however && and || are.
 .. [#] ternary operator(?:) has different behaviors depending on condition
   operand's vector type. If the condition is a GNU vector (i.e. __vector_size__),
   it's only available in C++ and uses normal bool conversions (that is, != 0).
diff --git a/clang/lib/CodeGen/CGExprScalar.cpp b/clang/lib/CodeGen/CGExprScalar.cpp
--- a/clang/lib/CodeGen/CGExprScalar.cpp
+++ b/clang/lib/CodeGen/CGExprScalar.cpp
@@ -2762,7 +2762,9 @@
 
 Value *ScalarExprEmitter::VisitUnaryLNot(const UnaryOperator *E) {
   // Perform vector logical not on comparison with zero vector.
-  if (E->getType()->isExtVectorType()) {
+  if (E->getType()->isVectorType() &&
+      E->getType()->castAs<VectorType>()->getVectorKind() ==
+          VectorType::GenericVector) {
     Value *Oper = Visit(E->getSubExpr());
     Value *Zero = llvm::Constant::getNullValue(Oper->getType());
     Value *Result;
diff --git a/clang/lib/Sema/SemaExpr.cpp b/clang/lib/Sema/SemaExpr.cpp
--- a/clang/lib/Sema/SemaExpr.cpp
+++ b/clang/lib/Sema/SemaExpr.cpp
@@ -14484,9 +14484,16 @@
       // Vector logical not returns the signed variant of the operand type.
       resultType = GetSignedVectorType(resultType);
       break;
+    } else if (Context.getLangOpts().CPlusPlus && resultType->isVectorType()) {
+      const VectorType *VTy = resultType->castAs<VectorType>();
+      if (VTy->getVectorKind() != VectorType::GenericVector)
+        return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr)
+                         << resultType << Input.get()->getSourceRange());
+
+      // Vector logical not returns the signed variant of the operand type.
+      resultType = GetSignedVectorType(resultType);
+      break;
     } else {
-      // FIXME: GCC's vector extension permits the usage of '!' with a vector
-      //        type in C++. We should allow that here too.
       return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr)
         << resultType << Input.get()->getSourceRange());
     }
diff --git a/clang/test/CodeGen/vector-logic-not.cpp b/clang/test/CodeGen/vector-logic-not.cpp
new file mode 100644
--- /dev/null
+++ b/clang/test/CodeGen/vector-logic-not.cpp
@@ -0,0 +1,21 @@
+// RUN: %clang_cc1 -emit-llvm %s -o - | FileCheck %s
+
+typedef __attribute__((__vector_size__(16))) float float4;
+typedef __attribute__((__vector_size__(16))) int int4;
+typedef __attribute__((__vector_size__(16))) unsigned int uint4;
+
+// CHECK: @_Z5test1Dv4_j
+int4 test1(uint4 V0) {
+  // CHECK: [[CMP0:%.*]] = icmp eq <4 x i32> [[V0:%.*]], zeroinitializer
+  // CHECK-NEXT: [[V1:%.*]] = sext <4 x i1> [[CMP0]] to <4 x i32>
+  int4 V = !V0;
+  return V;
+}
+
+// CHECK: @_Z5test2Dv4_fS_
+int4 test2(float4 V0, float4 V1) {
+  // CHECK: [[CMP0:%.*]] = fcmp oeq <4 x float> [[V0:%.*]], zeroinitializer
+  // CHECK-NEXT: [[V1:%.*]] = sext <4 x i1> [[CMP0]] to <4 x i32>
+  int4 V = !V0;
+  return V;
+}
diff --git a/clang/test/Sema/vector-gcc-compat.cpp b/clang/test/Sema/vector-gcc-compat.cpp
--- a/clang/test/Sema/vector-gcc-compat.cpp
+++ b/clang/test/Sema/vector-gcc-compat.cpp
@@ -83,7 +83,7 @@
   v2i64 v2i64_c = (v2i64){3, 1}; // expected-warning {{compound literals are a C99-specific feature}}
   v2i64 v2i64_r;
 
-  v2i64_r = !v2i64_a;  // expected-error {{invalid argument type 'v2i64' (vector of 2 'long long' values) to unary expression}}
+  v2i64_r = !v2i64_a;
   v2i64_r = ~v2i64_a;
 
   v2i64_r = v2i64_a ? v2i64_b : v2i64_c;