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43 lines
1.3 KiB
C#
43 lines
1.3 KiB
C#
// Licensed to the .NET Foundation under one or more agreements.
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// The .NET Foundation licenses this file to you under the MIT license.
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// See the LICENSE file in the project root for more information.
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using System.Diagnostics.Contracts;
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using System.Runtime.CompilerServices;
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#if NETCOREAPP3_1 || NET5_0
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using static System.Numerics.BitOperations;
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#endif
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namespace CommunityToolkit.HighPerformance.Helpers.Internals;
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/// <summary>
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/// Utility methods for intrinsic bit-twiddling operations. The methods use hardware intrinsics
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/// when available on the underlying platform, otherwise they use optimized software fallbacks.
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/// </summary>
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internal static class BitOperations
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{
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/// <summary>
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/// Rounds up an <see cref="int"/> value to a power of 2.
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/// </summary>
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/// <param name="x">The input value to round up.</param>
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/// <returns>The smallest power of two greater than or equal to <paramref name="x"/>.</returns>
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[Pure]
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static int RoundUpPowerOfTwo(int x)
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{
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#if NETCOREAPP3_1 || NET5_0
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return 1 << (32 - LeadingZeroCount((uint)(x - 1)));
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#else
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x--;
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x |= x >> 1;
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x |= x >> 2;
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x |= x >> 4;
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x |= x >> 8;
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x |= x >> 16;
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x++;
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return x;
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#endif
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}
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}
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