diff --git a/src/System.Runtime.Intrinsics.Experimental/ref/System.Runtime.Intrinsics.Experimental.cs b/src/System.Runtime.Intrinsics.Experimental/ref/System.Runtime.Intrinsics.Experimental.cs
index 79ff28111d55..8a16d0fc17e1 100644
--- a/src/System.Runtime.Intrinsics.Experimental/ref/System.Runtime.Intrinsics.Experimental.cs
+++ b/src/System.Runtime.Intrinsics.Experimental/ref/System.Runtime.Intrinsics.Experimental.cs
@@ -72,6 +72,23 @@ internal AdvSimd() { }
         public static System.Runtime.Intrinsics.Vector64<float> AndNot(System.Runtime.Intrinsics.Vector64<float> left, System.Runtime.Intrinsics.Vector64<float> right) { throw null; }
         public static System.Runtime.Intrinsics.Vector64<ushort> AndNot(System.Runtime.Intrinsics.Vector64<ushort> left, System.Runtime.Intrinsics.Vector64<ushort> right) { throw null; }
         public static System.Runtime.Intrinsics.Vector64<uint> AndNot(System.Runtime.Intrinsics.Vector64<uint> left, System.Runtime.Intrinsics.Vector64<uint> right) { throw null; }
+        public static System.Runtime.Intrinsics.Vector128<byte> BitwiseSelect(System.Runtime.Intrinsics.Vector128<byte> select, System.Runtime.Intrinsics.Vector128<byte> left, System.Runtime.Intrinsics.Vector128<byte> right) { throw null; }
+        public static System.Runtime.Intrinsics.Vector128<double> BitwiseSelect(System.Runtime.Intrinsics.Vector128<double> select, System.Runtime.Intrinsics.Vector128<double> left, System.Runtime.Intrinsics.Vector128<double> right) { throw null; }
+        public static System.Runtime.Intrinsics.Vector128<short> BitwiseSelect(System.Runtime.Intrinsics.Vector128<short> select, System.Runtime.Intrinsics.Vector128<short> left, System.Runtime.Intrinsics.Vector128<short> right) { throw null; }
+        public static System.Runtime.Intrinsics.Vector128<int> BitwiseSelect(System.Runtime.Intrinsics.Vector128<int> select, System.Runtime.Intrinsics.Vector128<int> left, System.Runtime.Intrinsics.Vector128<int> right) { throw null; }
+        public static System.Runtime.Intrinsics.Vector128<long> BitwiseSelect(System.Runtime.Intrinsics.Vector128<long> select, System.Runtime.Intrinsics.Vector128<long> left, System.Runtime.Intrinsics.Vector128<long> right) { throw null; }
+        public static System.Runtime.Intrinsics.Vector128<sbyte> BitwiseSelect(System.Runtime.Intrinsics.Vector128<sbyte> select, System.Runtime.Intrinsics.Vector128<sbyte> left, System.Runtime.Intrinsics.Vector128<sbyte> right) { throw null; }
+        public static System.Runtime.Intrinsics.Vector128<float> BitwiseSelect(System.Runtime.Intrinsics.Vector128<float> select, System.Runtime.Intrinsics.Vector128<float> left, System.Runtime.Intrinsics.Vector128<float> right) { throw null; }
+        public static System.Runtime.Intrinsics.Vector128<ushort> BitwiseSelect(System.Runtime.Intrinsics.Vector128<ushort> select, System.Runtime.Intrinsics.Vector128<ushort> left, System.Runtime.Intrinsics.Vector128<ushort> right) { throw null; }
+        public static System.Runtime.Intrinsics.Vector128<uint> BitwiseSelect(System.Runtime.Intrinsics.Vector128<uint> select, System.Runtime.Intrinsics.Vector128<uint> left, System.Runtime.Intrinsics.Vector128<uint> right) { throw null; }
+        public static System.Runtime.Intrinsics.Vector128<ulong> BitwiseSelect(System.Runtime.Intrinsics.Vector128<ulong> select, System.Runtime.Intrinsics.Vector128<ulong> left, System.Runtime.Intrinsics.Vector128<ulong> right) { throw null; }
+        public static System.Runtime.Intrinsics.Vector64<byte> BitwiseSelect(System.Runtime.Intrinsics.Vector64<byte> select, System.Runtime.Intrinsics.Vector64<byte> left, System.Runtime.Intrinsics.Vector64<byte> right) { throw null; }
+        public static System.Runtime.Intrinsics.Vector64<short> BitwiseSelect(System.Runtime.Intrinsics.Vector64<short> select, System.Runtime.Intrinsics.Vector64<short> left, System.Runtime.Intrinsics.Vector64<short> right) { throw null; }
+        public static System.Runtime.Intrinsics.Vector64<int> BitwiseSelect(System.Runtime.Intrinsics.Vector64<int> select, System.Runtime.Intrinsics.Vector64<int> left, System.Runtime.Intrinsics.Vector64<int> right) { throw null; }
+        public static System.Runtime.Intrinsics.Vector64<sbyte> BitwiseSelect(System.Runtime.Intrinsics.Vector64<sbyte> select, System.Runtime.Intrinsics.Vector64<sbyte> left, System.Runtime.Intrinsics.Vector64<sbyte> right) { throw null; }
+        public static System.Runtime.Intrinsics.Vector64<float> BitwiseSelect(System.Runtime.Intrinsics.Vector64<float> select, System.Runtime.Intrinsics.Vector64<float> left, System.Runtime.Intrinsics.Vector64<float> right) { throw null; }
+        public static System.Runtime.Intrinsics.Vector64<ushort> BitwiseSelect(System.Runtime.Intrinsics.Vector64<ushort> select, System.Runtime.Intrinsics.Vector64<ushort> left, System.Runtime.Intrinsics.Vector64<ushort> right) { throw null; }
+        public static System.Runtime.Intrinsics.Vector64<uint> BitwiseSelect(System.Runtime.Intrinsics.Vector64<uint> select, System.Runtime.Intrinsics.Vector64<uint> left, System.Runtime.Intrinsics.Vector64<uint> right) { throw null; }
         public static System.Runtime.Intrinsics.Vector128<byte> LeadingSignCount(System.Runtime.Intrinsics.Vector128<byte> value) { throw null; }
         public static System.Runtime.Intrinsics.Vector128<short> LeadingSignCount(System.Runtime.Intrinsics.Vector128<short> value) { throw null; }
         public static System.Runtime.Intrinsics.Vector128<int> LeadingSignCount(System.Runtime.Intrinsics.Vector128<int> value) { throw null; }