BigMul() [3/3]

static unsafe ulong System.Math.BigMul ( ulong a, ulong b, out ulong low )

inlinestatic

Definition at line 235 of file Math.cs.

    {
        if (Bmi2.X64.IsSupported)
        {
            System.Runtime.CompilerServices.Unsafe.SkipInit(out ulong num);
            ulong result = Bmi2.X64.MultiplyNoFlags(a, b, &num);
            low = num;
            return result;
        }
        if (ArmBase.Arm64.IsSupported)
        {
        }
        return SoftwareFallback(a, b, out low);
        static ulong SoftwareFallback(ulong a, ulong b, out ulong low)
        {
            uint num2 = (uint)a;
            uint num3 = (uint)(a >> 32);
            uint num4 = (uint)b;
            uint num5 = (uint)(b >> 32);
            ulong num6 = (ulong)num2 * (ulong)num4;
            ulong num7 = (ulong)((long)num3 * (long)num4) + (num6 >> 32);
            ulong num8 = (ulong)((long)num2 * (long)num5 + (uint)num7);
            low = (num8 << 32) | (uint)num6;
            return (ulong)((long)num3 * (long)num5 + (long)(num7 >> 32)) + (num8 >> 32);
        }
    }

References System.Runtime.Intrinsics.Arm.ArmBase.Arm64.IsSupported, System.Runtime.Intrinsics.X86.Bmi2.X64.IsSupported, and System.Runtime.Intrinsics.X86.Bmi2.X64.MultiplyNoFlags().