System.Data.SqlTypes.SqlDecimal.GetHashCode C# (CSharp) Method

        public override int GetHashCode()
        {
            if (IsNull)
                return 0;

            SqlDecimal ssnumTemp;
            int lActualPrec;

            // First, "normalize" numeric, so that values with different
            // scale/precision will have the same representation.
            ssnumTemp = this;
            lActualPrec = ssnumTemp.CalculatePrecision();
            ssnumTemp.AdjustScale(s_NUMERIC_MAX_PRECISION - lActualPrec, true);

            // Now evaluate the hash
            int cDwords = ssnumTemp._bLen;
            int ulValue = 0;
            int ulHi;

            // Size of CRC window (hashing bytes, ssstr, sswstr, numeric)
            const int x_cbCrcWindow = 4;
            // const int iShiftVal = (sizeof ulValue) * (8*sizeof(char)) - x_cbCrcWindow;
            const int iShiftVal = 4 * 8 - x_cbCrcWindow;

            int[] rgiData = ssnumTemp.Data;

            for (int i = 0; i < cDwords; i++)
            {
                ulHi = (ulValue >> iShiftVal) & 0xff;
                ulValue <<= x_cbCrcWindow;
                ulValue = ulValue ^ rgiData[i] ^ ulHi;
            }
            return ulValue;
        }