1 files changed, 96 insertions, 0 deletions
diff --git a/src/System.Private.CoreLib/shared/System/Runtime/Intrinsics/X86/Bmi1.cs b/src/System.Private.CoreLib/shared/System/Runtime/Intrinsics/X86/Bmi1.cs
new file mode 100644
index 000000000..f06f54d83
--- /dev/null
+++ b/src/System.Private.CoreLib/shared/System/Runtime/Intrinsics/X86/Bmi1.cs
@@ -0,0 +1,96 @@
+// 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 BMI1 hardware instructions via intrinsics
+    /// </summary>
+    [CLSCompliant(false)]
+    public abstract class Bmi1
+    {
+        internal Bmi1() { }
+
+        public static bool IsSupported { get => IsSupported; }
+
+        /// <summary>
+        /// unsigned int _andn_u32 (unsigned int a, unsigned int b)
+        ///   ANDN r32a, r32b, reg/m32
+        /// </summary>
+        public static uint AndNot(uint left, uint right) => AndNot(left, right);
+        /// <summary>
+        /// unsigned __int64 _andn_u64 (unsigned __int64 a, unsigned __int64 b)
+        ///   ANDN r64a, r64b, reg/m64
+        /// </summary>
+        public static ulong AndNot(ulong left, ulong right) => AndNot(left, right);
+
+        /// <summary>
+        /// unsigned int _bextr_u32 (unsigned int a, unsigned int start, unsigned int len)
+        ///   BEXTR r32a, reg/m32, r32b
+        /// </summary>
+        public static uint BitFieldExtract(uint value, byte start, byte length) => BitFieldExtract(value, start, length);
+        /// <summary>
+        /// unsigned __int64 _bextr_u64 (unsigned __int64 a, unsigned int start, unsigned int len)
+        ///   BEXTR r64a, reg/m64, r64b
+        /// </summary>
+        public static ulong BitFieldExtract(ulong value, byte start, byte length) => BitFieldExtract(value, start, length);
+        /// <summary>
+        /// unsigned int _bextr2_u32 (unsigned int a, unsigned int control)
+        ///   BEXTR r32a, reg/m32, r32b
+        /// </summary>
+        public static uint BitFieldExtract(uint value, ushort control) => BitFieldExtract(value, control);
+        /// <summary>
+        /// unsigned __int64 _bextr2_u64 (unsigned __int64 a, unsigned __int64 control)
+        ///   BEXTR r64a, reg/m64, r64b
+        /// </summary>
+        public static ulong BitFieldExtract(ulong value, ushort control) => BitFieldExtract(value, control);
+
+        /// <summary>
+        /// unsigned int _blsi_u32 (unsigned int a)
+        ///   BLSI reg, reg/m32
+        /// </summary>
+        public static uint ExtractLowestSetBit(uint value) => ExtractLowestSetBit(value);
+        /// <summary>
+        /// unsigned __int64 _blsi_u64 (unsigned __int64 a)
+        ///   BLSI reg, reg/m64
+        /// </summary>
+        public static ulong ExtractLowestSetBit(ulong value) => ExtractLowestSetBit(value);
+
+        /// <summary>
+        /// unsigned int _blsmsk_u32 (unsigned int a)
+        ///   BLSMSK reg, reg/m32
+        /// </summary>
+        public static uint GetMaskUpToLowestSetBit(uint value) => GetMaskUpToLowestSetBit(value);
+        /// <summary>
+        /// unsigned __int64 _blsmsk_u64 (unsigned __int64 a)
+        ///   BLSMSK reg, reg/m64
+        /// </summary>
+        public static ulong GetMaskUpToLowestSetBit(ulong value) => GetMaskUpToLowestSetBit(value);
+
+        /// <summary>
+        /// unsigned int _blsr_u32 (unsigned int a)
+        ///   BLSR reg, reg/m32
+        /// </summary>
+        public static uint ResetLowestSetBit(uint value) => ResetLowestSetBit(value);
+        /// <summary>
+        /// unsigned __int64 _blsr_u64 (unsigned __int64 a)
+        ///   BLSR reg, reg/m64
+        /// </summary>
+        public static ulong ResetLowestSetBit(ulong value) => ResetLowestSetBit(value);
+
+        /// <summary>
+        /// int _mm_tzcnt_32 (unsigned int a)
+        ///   TZCNT reg, reg/m32
+        /// </summary>
+        public static uint TrailingZeroCount(uint value) => TrailingZeroCount(value);
+        /// <summary>
+        /// __int64 _mm_tzcnt_64 (unsigned __int64 a)
+        ///   TZCNT reg, reg/m64
+        /// </summary>
+        public static ulong TrailingZeroCount(ulong value) => TrailingZeroCount(value);
+    }
+}