/*
 * Returns a space separated string containing a list of all variant
 * instruction set architectures executable on the current system.
 *  
 * They are listed in order of performance, from best to worst.
*/
static VALUE uname_isalist()
{
   char buf[BUFSIZE];
   sysinfo(SI_ISALIST, buf, BUFSIZE);
   return rb_str_new2(buf);
}