63 lines
2.0 KiB
C#
63 lines
2.0 KiB
C#
using System.Diagnostics;
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namespace Unity.Burst.Intrinsics
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{
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public unsafe static partial class X86
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{
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/// <summary>
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/// popcnt intrinsics
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/// </summary>
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public static class Popcnt
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{
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/// <summary>
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/// Evaluates to true at compile time if popcnt intrinsics are supported.
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///
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/// Burst ties popcnt support to SSE4.2 support to simplify feature sets to support.
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/// </summary>
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public static bool IsPopcntSupported { get { return Sse4_2.IsSse42Supported; } }
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/// <summary>
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/// Count the number of bits set to 1 in unsigned 32-bit integer a, and return that count in dst.
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/// </summary>
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/// <remarks>
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/// **** popcnt r32, r32
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/// </remarks>
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/// <param name="v">Integer to be counted in</param>
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/// <returns>Count</returns>
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[DebuggerStepThrough]
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public static int popcnt_u32(uint v)
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{
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int result = 0;
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uint mask = 0x80000000u;
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while (mask != 0)
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{
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result += ((v & mask) != 0) ? 1 : 0;
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mask >>= 1;
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}
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return result;
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}
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/// <summary>
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/// Count the number of bits set to 1 in unsigned 64-bit integer a, and return that count in dst.
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/// </summary>
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/// <remarks>
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/// **** popcnt r64, r64
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/// </remarks>
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/// <param name="v">Integer to be counted in</param>
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/// <returns>Count</returns>
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[DebuggerStepThrough]
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public static int popcnt_u64(ulong v)
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{
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int result = 0;
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ulong mask = 0x8000000000000000u;
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while (mask != 0)
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{
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result += ((v & mask) != 0) ? 1 : 0;
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mask >>= 1;
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}
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return result;
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}
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}
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}
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}
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