diff --git a/clang/include/clang/Basic/arm_neon.td b/clang/include/clang/Basic/arm_neon.td
--- a/clang/include/clang/Basic/arm_neon.td
+++ b/clang/include/clang/Basic/arm_neon.td
@@ -646,7 +646,7 @@
 def VQABS   : SInst<"vqabs", "..", "csiQcQsQi">;
 def VNEG    : SOpInst<"vneg", "..", "csifQcQsQiQf", OP_NEG>;
 def VQNEG   : SInst<"vqneg", "..", "csiQcQsQi">;
-def VCLS    : SInst<"vcls", "..", "csiQcQsQi">;
+def VCLS    : SInst<"vcls", "S.", "csiUcUsUiQcQsQiQUcQUsQUi">;
 def VCLZ    : IInst<"vclz", "..", "csiUcUsUiQcQsQiQUcQUsQUi">;
 def VCNT    : WInst<"vcnt", "..", "UccPcQUcQcQPc">;
 def VRECPE  : SInst<"vrecpe", "..", "fUiQfQUi">;
diff --git a/clang/test/CodeGen/aarch64-neon-misc.c b/clang/test/CodeGen/aarch64-neon-misc.c
--- a/clang/test/CodeGen/aarch64-neon-misc.c
+++ b/clang/test/CodeGen/aarch64-neon-misc.c
@@ -1432,6 +1432,13 @@
   return vcls_s8(a);
 }
 
+// CHECK-LABEL: @test_vcls_u8(
+// CHECK:   [[VCLS_V_I:%.*]] = call <8 x i8> @llvm.aarch64.neon.cls.v8i8(<8 x i8> %a)
+// CHECK:   ret <8 x i8> [[VCLS_V_I]]
+int8x8_t test_vcls_u8(uint8x8_t a) {
+  return vcls_u8(a);
+}
+
 // CHECK-LABEL: @test_vclsq_s8(
 // CHECK:   [[VCLSQ_V_I:%.*]] = call <16 x i8> @llvm.aarch64.neon.cls.v16i8(<16 x i8> %a)
 // CHECK:   ret <16 x i8> [[VCLSQ_V_I]]
@@ -1439,6 +1446,13 @@
   return vclsq_s8(a);
 }
 
+// CHECK-LABEL: @test_vclsq_u8(
+// CHECK:   [[VCLSQ_V_I:%.*]] = call <16 x i8> @llvm.aarch64.neon.cls.v16i8(<16 x i8> %a)
+// CHECK:   ret <16 x i8> [[VCLSQ_V_I]]
+int8x16_t test_vclsq_u8(uint8x16_t a) {
+  return vclsq_u8(a);
+}
+
 // CHECK-LABEL: @test_vcls_s16(
 // CHECK:   [[TMP0:%.*]] = bitcast <4 x i16> %a to <8 x i8>
 // CHECK:   [[VCLS_V1_I:%.*]] = call <4 x i16> @llvm.aarch64.neon.cls.v4i16(<4 x i16> %a)
@@ -1448,6 +1462,15 @@
   return vcls_s16(a);
 }
 
+// CHECK-LABEL: @test_vcls_u16(
+// CHECK:   [[TMP0:%.*]] = bitcast <4 x i16> %a to <8 x i8>
+// CHECK:   [[VCLS_V1_I:%.*]] = call <4 x i16> @llvm.aarch64.neon.cls.v4i16(<4 x i16> %a)
+// CHECK:   [[VCLS_V2_I:%.*]] = bitcast <4 x i16> [[VCLS_V1_I]] to <8 x i8>
+// CHECK:   ret <4 x i16> [[VCLS_V1_I]]
+int16x4_t test_vcls_u16(uint16x4_t a) {
+  return vcls_u16(a);
+}
+
 // CHECK-LABEL: @test_vclsq_s16(
 // CHECK:   [[TMP0:%.*]] = bitcast <8 x i16> %a to <16 x i8>
 // CHECK:   [[VCLSQ_V1_I:%.*]] = call <8 x i16> @llvm.aarch64.neon.cls.v8i16(<8 x i16> %a)
@@ -1457,6 +1480,15 @@
   return vclsq_s16(a);
 }
 
+// CHECK-LABEL: @test_vclsq_u16(
+// CHECK:   [[TMP0:%.*]] = bitcast <8 x i16> %a to <16 x i8>
+// CHECK:   [[VCLSQ_V1_I:%.*]] = call <8 x i16> @llvm.aarch64.neon.cls.v8i16(<8 x i16> %a)
+// CHECK:   [[VCLSQ_V2_I:%.*]] = bitcast <8 x i16> [[VCLSQ_V1_I]] to <16 x i8>
+// CHECK:   ret <8 x i16> [[VCLSQ_V1_I]]
+int16x8_t test_vclsq_u16(uint16x8_t a) {
+  return vclsq_u16(a);
+}
+
 // CHECK-LABEL: @test_vcls_s32(
 // CHECK:   [[TMP0:%.*]] = bitcast <2 x i32> %a to <8 x i8>
 // CHECK:   [[VCLS_V1_I:%.*]] = call <2 x i32> @llvm.aarch64.neon.cls.v2i32(<2 x i32> %a)
@@ -1466,6 +1498,15 @@
   return vcls_s32(a);
 }
 
+// CHECK-LABEL: @test_vcls_u32(
+// CHECK:   [[TMP0:%.*]] = bitcast <2 x i32> %a to <8 x i8>
+// CHECK:   [[VCLS_V1_I:%.*]] = call <2 x i32> @llvm.aarch64.neon.cls.v2i32(<2 x i32> %a)
+// CHECK:   [[VCLS_V2_I:%.*]] = bitcast <2 x i32> [[VCLS_V1_I]] to <8 x i8>
+// CHECK:   ret <2 x i32> [[VCLS_V1_I]]
+int32x2_t test_vcls_u32(uint32x2_t a) {
+  return vcls_u32(a);
+}
+
 // CHECK-LABEL: @test_vclsq_s32(
 // CHECK:   [[TMP0:%.*]] = bitcast <4 x i32> %a to <16 x i8>
 // CHECK:   [[VCLSQ_V1_I:%.*]] = call <4 x i32> @llvm.aarch64.neon.cls.v4i32(<4 x i32> %a)
@@ -1475,6 +1516,15 @@
   return vclsq_s32(a);
 }
 
+// CHECK-LABEL: @test_vclsq_u32(
+// CHECK:   [[TMP0:%.*]] = bitcast <4 x i32> %a to <16 x i8>
+// CHECK:   [[VCLSQ_V1_I:%.*]] = call <4 x i32> @llvm.aarch64.neon.cls.v4i32(<4 x i32> %a)
+// CHECK:   [[VCLSQ_V2_I:%.*]] = bitcast <4 x i32> [[VCLSQ_V1_I]] to <16 x i8>
+// CHECK:   ret <4 x i32> [[VCLSQ_V1_I]]
+int32x4_t test_vclsq_u32(uint32x4_t a) {
+  return vclsq_u32(a);
+}
+
 // CHECK-LABEL: @test_vclz_s8(
 // CHECK:   [[VCLZ_V_I:%.*]] = call <8 x i8> @llvm.ctlz.v8i8(<8 x i8> %a, i1 false)
 // CHECK:   ret <8 x i8> [[VCLZ_V_I]]
diff --git a/clang/test/CodeGen/arm_neon_intrinsics.c b/clang/test/CodeGen/arm_neon_intrinsics.c
--- a/clang/test/CodeGen/arm_neon_intrinsics.c
+++ b/clang/test/CodeGen/arm_neon_intrinsics.c
@@ -1776,6 +1776,31 @@
   return vcls_s32(a);
 }
 
+// CHECK-LABEL: @test_vcls_u8(
+// CHECK:   [[VCLS_V_I:%.*]] = call <8 x i8> @llvm.arm.neon.vcls.v8i8(<8 x i8> %a)
+// CHECK:   ret <8 x i8> [[VCLS_V_I]]
+int8x8_t test_vcls_u8(uint8x8_t a) {
+  return vcls_u8(a);
+}
+
+// CHECK-LABEL: @test_vcls_u16(
+// CHECK:   [[TMP0:%.*]] = bitcast <4 x i16> %a to <8 x i8>
+// CHECK:   [[VCLS_V1_I:%.*]] = call <4 x i16> @llvm.arm.neon.vcls.v4i16(<4 x i16> %a)
+// CHECK:   [[VCLS_V2_I:%.*]] = bitcast <4 x i16> [[VCLS_V1_I]] to <8 x i8>
+// CHECK:   ret <4 x i16> [[VCLS_V1_I]]
+int16x4_t test_vcls_u16(uint16x4_t a) {
+  return vcls_u16(a);
+}
+
+// CHECK-LABEL: @test_vcls_u32(
+// CHECK:   [[TMP0:%.*]] = bitcast <2 x i32> %a to <8 x i8>
+// CHECK:   [[VCLS_V1_I:%.*]] = call <2 x i32> @llvm.arm.neon.vcls.v2i32(<2 x i32> %a)
+// CHECK:   [[VCLS_V2_I:%.*]] = bitcast <2 x i32> [[VCLS_V1_I]] to <8 x i8>
+// CHECK:   ret <2 x i32> [[VCLS_V1_I]]
+int32x2_t test_vcls_u32(uint32x2_t a) {
+  return vcls_u32(a);
+}
+
 // CHECK-LABEL: @test_vclsq_s8(
 // CHECK:   [[VCLSQ_V_I:%.*]] = call <16 x i8> @llvm.arm.neon.vcls.v16i8(<16 x i8> %a)
 // CHECK:   ret <16 x i8> [[VCLSQ_V_I]]
@@ -1801,6 +1826,31 @@
   return vclsq_s32(a);
 }
 
+// CHECK-LABEL: @test_vclsq_u8(
+// CHECK:   [[VCLSQ_V_I:%.*]] = call <16 x i8> @llvm.arm.neon.vcls.v16i8(<16 x i8> %a)
+// CHECK:   ret <16 x i8> [[VCLSQ_V_I]]
+int8x16_t test_vclsq_u8(uint8x16_t a) {
+  return vclsq_u8(a);
+}
+
+// CHECK-LABEL: @test_vclsq_u16(
+// CHECK:   [[TMP0:%.*]] = bitcast <8 x i16> %a to <16 x i8>
+// CHECK:   [[VCLSQ_V1_I:%.*]] = call <8 x i16> @llvm.arm.neon.vcls.v8i16(<8 x i16> %a)
+// CHECK:   [[VCLSQ_V2_I:%.*]] = bitcast <8 x i16> [[VCLSQ_V1_I]] to <16 x i8>
+// CHECK:   ret <8 x i16> [[VCLSQ_V1_I]]
+int16x8_t test_vclsq_u16(uint16x8_t a) {
+  return vclsq_u16(a);
+}
+
+// CHECK-LABEL: @test_vclsq_u32(
+// CHECK:   [[TMP0:%.*]] = bitcast <4 x i32> %a to <16 x i8>
+// CHECK:   [[VCLSQ_V1_I:%.*]] = call <4 x i32> @llvm.arm.neon.vcls.v4i32(<4 x i32> %a)
+// CHECK:   [[VCLSQ_V2_I:%.*]] = bitcast <4 x i32> [[VCLSQ_V1_I]] to <16 x i8>
+// CHECK:   ret <4 x i32> [[VCLSQ_V1_I]]
+int32x4_t test_vclsq_u32(uint32x4_t a) {
+  return vclsq_u32(a);
+}
+
 // CHECK-LABEL: @test_vclt_s8(
 // CHECK:   [[CMP_I:%.*]] = icmp slt <8 x i8> %a, %b
 // CHECK:   [[SEXT_I:%.*]] = sext <8 x i1> [[CMP_I]] to <8 x i8>