diff --git a/clang/lib/CIR/CodeGen/CIRGenExprScalar.cpp b/clang/lib/CIR/CodeGen/CIRGenExprScalar.cpp
index 3b22c689ecd9f..3d5dd283fee31 100644
--- a/clang/lib/CIR/CodeGen/CIRGenExprScalar.cpp
+++ b/clang/lib/CIR/CodeGen/CIRGenExprScalar.cpp
@@ -2087,9 +2087,13 @@ mlir::Value ScalarExprEmitter::VisitUnaryLNot(const UnaryOperator *e) {
   if (e->getType()->isVectorType() &&
       e->getType()->castAs<VectorType>()->getVectorKind() ==
           VectorKind::Generic) {
-    assert(!cir::MissingFeatures::vectorType());
-    cgf.cgm.errorNYI(e->getSourceRange(), "vector logical not");
-    return {};
+    mlir::Value oper = Visit(e->getSubExpr());
+    mlir::Location loc = cgf.getLoc(e->getExprLoc());
+    auto operVecTy = mlir::cast<cir::VectorType>(oper.getType());
+    auto exprVecTy = mlir::cast<cir::VectorType>(cgf.convertType(e->getType()));
+    mlir::Value zeroVec = builder.getNullValue(operVecTy, loc);
+    return cir::VecCmpOp::create(builder, loc, exprVecTy, cir::CmpOpKind::eq,
+                                 oper, zeroVec);
   }
 
   // Compare operand to zero.
@@ -2360,4 +2364,4 @@ mlir::Value CIRGenFunction::emitScalarPrePostIncDec(const UnaryOperator *e,
                                                     bool isPre) {
   return ScalarExprEmitter(*this, builder)
       .emitScalarPrePostIncDec(e, lv, kind, isPre);
-}
\ No newline at end of file
+}
diff --git a/clang/test/CIR/CodeGen/vector-ext.cpp b/clang/test/CIR/CodeGen/vector-ext.cpp
index 287d016ff6d1e..8b5379a2b1a88 100644
--- a/clang/test/CIR/CodeGen/vector-ext.cpp
+++ b/clang/test/CIR/CodeGen/vector-ext.cpp
@@ -1295,4 +1295,30 @@ void foo23() {
 // OGCG: %[[NE_B_ZERO:.*]] = icmp ne <4 x i32> %[[TMP_B]], zeroinitializer
 // OGCG: %[[VEC_OR:.*]] = and <4 x i1> %[[NE_A_ZERO]], %[[NE_B_ZERO]]
 // OGCG: %[[RESULT:.*]] = sext <4 x i1> %[[VEC_OR]] to <4 x i32>
-// OGCG: store <4 x i32> %[[RESULT]], ptr %[[C_ADDR]], align 16
\ No newline at end of file
+// OGCG: store <4 x i32> %[[RESULT]], ptr %[[C_ADDR]], align 16
+
+void logical_not() {
+   vi4 a;
+   vi4 b = !a;
+}
+
+// CIR: %[[A_ADDR:.*]] = cir.alloca !cir.vector<4 x !s32i>, !cir.ptr<!cir.vector<4 x !s32i>>, ["a"]
+// CIR: %[[B_ADDR:.*]] = cir.alloca !cir.vector<4 x !s32i>, !cir.ptr<!cir.vector<4 x !s32i>>, ["b", init]
+// CIR: %[[TMP_A:.*]] = cir.load{{.*}}) %[[A_ADDR]] : !cir.ptr<!cir.vector<4 x !s32i>>, !cir.vector<4 x !s32i>
+// CIR: %[[CONST_V0:.*]] = cir.const #cir.zero : !cir.vector<4 x !s32i>
+// CIR: %[[RESULT:.*]] = cir.vec.cmp(eq, %[[TMP_A]], %[[CONST_V0]]) : !cir.vector<4 x !s32i>, !cir.vector<4 x !s32i>
+// CIR: cir.store{{.*}} %[[RESULT]], %[[B_ADDR]] : !cir.vector<4 x !s32i>, !cir.ptr<!cir.vector<4 x !s32i>>
+
+// LLVM: %[[A_ADDR:.*]] = alloca <4 x i32>, i64 1, align 16
+// LLVM: %[[B_ADDR:.*]] = alloca <4 x i32>, i64 1, align 16
+// LLVM: %[[TMP_A:.*]] = load <4 x i32>, ptr %[[A_ADDR]], align 16
+// LLVM: %[[RESULT:.*]] = icmp eq <4 x i32> %[[TMP_A]], zeroinitializer
+// LLVM: %[[RESULT_VI4:.*]] = sext <4 x i1> %[[RESULT]] to <4 x i32>
+// LLVM: store <4 x i32> %[[RESULT_VI4]], ptr %[[B_ADDR]], align 16
+
+// OGCG: %[[A_ADDR:.*]] = alloca <4 x i32>, align 16
+// OGCG: %[[B_ADDR:.*]] = alloca <4 x i32>, align 16
+// OGCG: %[[TMP_A:.*]] = load <4 x i32>, ptr %[[A_ADDR]], align 16
+// OGCG: %[[RESULT:.*]] = icmp eq <4 x i32> %[[TMP_A]], zeroinitializer
+// OGCG: %[[RESULT_VI4:.*]] = sext <4 x i1> %[[RESULT]] to <4 x i32>
+// OGCG: store <4 x i32> %[[RESULT_VI4]], ptr %[[B_ADDR]], align 16
diff --git a/clang/test/CIR/CodeGen/vector.cpp b/clang/test/CIR/CodeGen/vector.cpp
index d66c7a3d2aba6..d8fdeea179288 100644
--- a/clang/test/CIR/CodeGen/vector.cpp
+++ b/clang/test/CIR/CodeGen/vector.cpp
@@ -1337,4 +1337,56 @@ void foo26() {
 // OGCG: %[[NE_B_ZERO:.*]] = icmp ne <4 x i32> %[[TMP_B]], zeroinitializer
 // OGCG: %[[VEC_OR:.*]] = and <4 x i1> %[[NE_A_ZERO]], %[[NE_B_ZERO]]
 // OGCG: %[[RESULT:.*]] = sext <4 x i1> %[[VEC_OR]] to <4 x i32>
-// OGCG: store <4 x i32> %[[RESULT]], ptr %[[C_ADDR]], align 16
\ No newline at end of file
+// OGCG: store <4 x i32> %[[RESULT]], ptr %[[C_ADDR]], align 16
+
+void logical_not() {
+   vi4 a;
+   vi4 b = !a;
+}
+
+// CIR: %[[A_ADDR:.*]] = cir.alloca !cir.vector<4 x !s32i>, !cir.ptr<!cir.vector<4 x !s32i>>, ["a"]
+// CIR: %[[B_ADDR:.*]] = cir.alloca !cir.vector<4 x !s32i>, !cir.ptr<!cir.vector<4 x !s32i>>, ["b", init]
+// CIR: %[[TMP_A:.*]] = cir.load{{.*}}) %[[A_ADDR]] : !cir.ptr<!cir.vector<4 x !s32i>>, !cir.vector<4 x !s32i>
+// CIR: %[[CONST_V0:.*]] = cir.const #cir.zero : !cir.vector<4 x !s32i>
+// CIR: %[[RESULT:.*]] = cir.vec.cmp(eq, %[[TMP_A]], %[[CONST_V0]]) : !cir.vector<4 x !s32i>, !cir.vector<4 x !s32i>
+// CIR: cir.store{{.*}} %[[RESULT]], %[[B_ADDR]] : !cir.vector<4 x !s32i>, !cir.ptr<!cir.vector<4 x !s32i>>
+
+// LLVM: %[[A_ADDR:.*]] = alloca <4 x i32>, i64 1, align 16
+// LLVM: %[[B_ADDR:.*]] = alloca <4 x i32>, i64 1, align 16
+// LLVM: %[[TMP_A:.*]] = load <4 x i32>, ptr %[[A_ADDR]], align 16
+// LLVM: %[[RESULT:.*]] = icmp eq <4 x i32> %[[TMP_A]], zeroinitializer
+// LLVM: %[[RESULT_VI4:.*]] = sext <4 x i1> %[[RESULT]] to <4 x i32>
+// LLVM: store <4 x i32> %[[RESULT_VI4]], ptr %[[B_ADDR]], align 16
+
+// OGCG: %[[A_ADDR:.*]] = alloca <4 x i32>, align 16
+// OGCG: %[[B_ADDR:.*]] = alloca <4 x i32>, align 16
+// OGCG: %[[TMP_A:.*]] = load <4 x i32>, ptr %[[A_ADDR]], align 16
+// OGCG: %[[RESULT:.*]] = icmp eq <4 x i32> %[[TMP_A]], zeroinitializer
+// OGCG: %[[RESULT_VI4:.*]] = sext <4 x i1> %[[RESULT]] to <4 x i32>
+// OGCG: store <4 x i32> %[[RESULT_VI4]], ptr %[[B_ADDR]], align 16
+
+void logical_not_float() {
+  vf4 a;
+  vi4 b = !a;
+}
+
+// CIR: %[[A_ADDR:.*]] = cir.alloca !cir.vector<4 x !cir.float>, !cir.ptr<!cir.vector<4 x !cir.float>>, ["a"]
+// CIR: %[[B_ADDR:.*]] = cir.alloca !cir.vector<4 x !s32i>, !cir.ptr<!cir.vector<4 x !s32i>>, ["b", init]
+// CIR: %[[TMP_A:.*]] = cir.load{{.*}} %[[A_ADDR]] : !cir.ptr<!cir.vector<4 x !cir.float>>, !cir.vector<4 x !cir.float>
+// CIR: %[[CONST_V0:.*]] = cir.const #cir.zero : !cir.vector<4 x !cir.float>
+// CIR: %[[RESULT:.*]] = cir.vec.cmp(eq, %[[TMP_A]], %[[CONST_V0]]) : !cir.vector<4 x !cir.float>, !cir.vector<4 x !s32i>
+// CIR: cir.store{{.*}} %[[RESULT]], %[[B_ADDR]] : !cir.vector<4 x !s32i>, !cir.ptr<!cir.vector<4 x !s32i>>
+
+// LLVM: %[[A_ADDR:.*]] = alloca <4 x float>, i64 1, align 16
+// LLVM: %[[B_ADDR:.*]] = alloca <4 x i32>, i64 1, align 16
+// LLVM: %[[TMP_A:.*]] = load <4 x float>, ptr %[[A_ADDR]], align 16
+// LLVM: %[[RESULT:.*]] = fcmp oeq <4 x float> %[[TMP_A]], zeroinitializer
+// LLVM: %[[RESULT_VI4:.*]] = sext <4 x i1> %[[RESULT]] to <4 x i32>
+// LLVM: store <4 x i32> %[[RESULT_VI4]], ptr %[[B_ADDR]], align 16
+
+// OGCG: %[[A_ADDR:.*]] = alloca <4 x float>, align 16
+// OGCG: %[[B_ADDR:.*]] = alloca <4 x i32>, align 16
+// OGCG: %[[TMP_A:.*]] = load <4 x float>, ptr %[[A_ADDR]], align 16
+// OGCG: %[[RESULT:.*]] = fcmp oeq <4 x float> %[[TMP_A]], zeroinitializer
+// OGCG: %[[RESULT_VI4:.*]] = sext <4 x i1> %[[RESULT]] to <4 x i32>
+// OGCG: store <4 x i32> %[[RESULT_VI4]], ptr %[[B_ADDR]], align 16