hm

correct.c

        CASE (Bswitch):
          {
            Lisp_Object jmp_table = POP;
            Lisp_Object v1 = TOP;
            Lisp_Object dest = Fgethash(v1, jmp_table, Qnil);
            if (!NILP(dest)) {
              int car = XINT(XCAR(dest));
              int cdr = XINT(XCDR(dest));
              op = car + (cdr << 8);
              goto op_branch;
            }
          }
          NEXT;

incorrect.c

        CASE (Bswitch):
          {
            Lisp_Object jmp_table = POP;
            Lisp_Object v1 = TOP;
            Lisp_Object dest = Fgethash(v1, jmp_table, Qnil);
            if (!NILP(dest)) {
              op = XINT((int)XINT(XCAR(dest)) + ((int)XINT(XCDR(dest)) << 8));
              goto op_branch;
            }
          }
          NEXT;