Int to string with goto

gistfile1.cs

unsafe static string itoa_int32(int snum) {
             char* s = stackalloc char[12];
             char* ps = s;
             int num1 = snum, num2, num3, div;
             if (snum < 0) {
                 *ps++ = '-';
                 //Can't negate int min
                 if (snum == -2147483648) 
                     return "-2147483648";
                 num1 = -num1;
             }
             if (num1 < 10000) {
                 if (num1 < 10) goto L1;
                 if (num1 < 100) goto L2;
                 if (num1 < 1000) goto L3;
             } else {
                 num2 = num1 / 10000;
                 num1 -= num2 * 10000;
                 if (num2 < 10000) {
                     if (num2 < 10) goto L5;
                     if (num2 < 100) goto L6;
                     if (num2 < 1000) goto L7;
                 } else {
                     num3 = num2 / 10000;
                     num2 -= num3 * 10000;
                     if (num3 >= 10) {
                         *ps++ = (char)('0' + (char)(div = (num3 * 6554) >> 16));
                         num3 -= div * 10;
                     }
                     *ps++ = (char)('0' + (num3));
                 }
                 *ps++ = (char)('0' + (div = (num2 * 8389) >> 23));
                 num2 -= div * 1000;
             L7:
                 *ps++ = (char)('0' + (div = (num2 * 5243) >> 19));
                 num2 -= div * 100;
             L6:
                 *ps++ = (char)('0' + (div = (num2 * 6554) >> 16));
                 num2 -= div * 10;
             L5:
                 *ps++ = (char)('0' + (num2));
             }
             *ps++ = (char)('0' + (div = (num1 * 8389) >> 23));
             num1 -= div * 1000;
         L3:
             *ps++ = (char)('0' + (div = (num1 * 5243) >> 19));
             num1 -= div * 100;
         L2:
             *ps++ = (char)('0' + (div = (num1 * 6554) >> 16));
             num1 -= div * 10;
         L1:
             *ps++ = (char)('0' + (num1));

             return new string(s);
         }