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62 lines
2.0 KiB
62 lines
2.0 KiB
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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