LeadingZeroCount() [2/2]

static int System.Numerics.BitOperations.LeadingZeroCount ( ulong value )

inlinestatic

Definition at line 153 of file BitOperations.cs.

    {
        if (Lzcnt.X64.IsSupported)
        {
            return (int)Lzcnt.X64.LeadingZeroCount(value);
        }
        if (ArmBase.Arm64.IsSupported)
        {
        }
        if (X86Base.X64.IsSupported)
        {
            if (value != 0L)
            {
                return 0x3F ^ (int)X86Base.X64.BitScanReverse(value);
            }
            return 64;
        }
        uint num = (uint)(value >> 32);
        if (num == 0)
        {
            return 32 + LeadingZeroCount((uint)value);
        }
        return LeadingZeroCount(num);
    }

References System.Runtime.Intrinsics.X86.X86Base.X64.BitScanReverse(), System.Runtime.Intrinsics.Arm.ArmBase.Arm64.IsSupported, System.Runtime.Intrinsics.X86.Lzcnt.X64.IsSupported, System.Runtime.Intrinsics.X86.X86Base.X64.IsSupported, System.L, System.Numerics.BitOperations.LeadingZeroCount(), System.Runtime.Intrinsics.X86.Lzcnt.X64.LeadingZeroCount(), and System.value.