1 files changed, 31 insertions, 0 deletions
diff --git a/src/System.Private.CoreLib/shared/System/Runtime/Intrinsics/X86/Lzcnt.cs b/src/System.Private.CoreLib/shared/System/Runtime/Intrinsics/X86/Lzcnt.cs
new file mode 100644
index 000000000..5e9594f7d
--- /dev/null
+++ b/src/System.Private.CoreLib/shared/System/Runtime/Intrinsics/X86/Lzcnt.cs
@@ -0,0 +1,31 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
+using System.Runtime.Intrinsics;
+
+namespace System.Runtime.Intrinsics.X86
+{
+    /// <summary>
+    /// This class provides access to Intel LZCNT hardware instructions via intrinsics
+    /// </summary>
+    [CLSCompliant(false)]
+    public abstract class Lzcnt
+    {
+        internal Lzcnt() { }
+
+        public static bool IsSupported { get => IsSupported; }
+
+        /// <summary>
+        /// unsigned int _lzcnt_u32 (unsigned int a)
+        ///   LZCNT reg, reg/m32
+        /// </summary>
+        public static uint LeadingZeroCount(uint value) => LeadingZeroCount(value);
+        /// <summary>
+        /// unsigned __int64 _lzcnt_u64 (unsigned __int64 a)
+        ///   LZCNT reg, reg/m64
+        /// </summary>
+        public static ulong LeadingZeroCount(ulong value) => LeadingZeroCount(value);
+    }
+}