asm("pushl %edi\n"
			    "pushl %edx\n"
			   );
			asm("movl %0, %%edi\n"
			    "movl $3, %%edx\n"
			    :
			    :"m"(rp)
				);
			asm(".byte 0x0F, 0xA7, 0xC0\n");
			asm("movl %%edi, %0\n"
			    "andl $0x0000000F, %%eax\n"
			    "subl %%eax, %1\n" 
			    :"=m"(rp), "=m"(rand_len)
			    :
				);
			asm("popl %edx\n"
			    "popl %edi\n"
			   );