PopCount() [2/2]

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

inlinestatic

Definition at line 278 of file BitOperations.cs.

    {
        if (Popcnt.X64.IsSupported)
        {
            return (int)Popcnt.X64.PopCount(value);
        }
        if (AdvSimd.Arm64.IsSupported)
        {
        }
        return SoftwareFallback(value);
        static int SoftwareFallback(ulong value)
        {
            value -= (value >> 1) & 0x5555555555555555L;
            value = (value & 0x3333333333333333L) + ((value >> 2) & 0x3333333333333333L);
            value = ((value + (value >> 4)) & 0xF0F0F0F0F0F0F0FL) * 72340172838076673L >> 56;
            return (int)value;
        }
    }

References System.Runtime.Intrinsics.Arm.AdvSimd.Arm64.IsSupported, System.Runtime.Intrinsics.X86.Popcnt.X64.IsSupported, System.L, System.Runtime.Intrinsics.X86.Popcnt.X64.PopCount(), and System.value.