2012计算机考研408真题和答案.pdf

20121n(n 0)()int fact(int n)if(nRd/SHL Rd 2*(Rd)-Rd SHR Rd(Rd)/2-Rd LOAD Rd,mem(mem)-Rd STORE Rs,mem(Rs)-mem 5IF/ID/EXMWB 1intx-513R1SHL R1R1 244 3x=a+b,xabintxab44 I1 LOAD R1,a I2 LOAD R2,b I3 ADD R1,R2 I4 STORE R2,x 1 23 4 5 6 78910111213 14 I1 IF ID EX M WB I2 IF ID EX MWB I3 IF IDEXMWB I4 IF IDEXM WB 44 4I3IDI4IF 4x=x*2+axaunsigned intxa44 457 05 32152141P 1 2 3 4 4684TB1TB=2401KBFCB512B 1 2076B2B5046B 479HInternetIP192.168.0.8SIP211.68.71.80HSTCPH5IP 47-a IP40 1 45 00 00 30 01 9b 40 00 80 06 1d c8 c0 a8 00 08 d3 44 47 50 0b d9 13 88 84 6b 41 c5 00 00 00 00 70 02 43 80 5d b0 00 00 2 45 00 00 30 00 00 40 00 31 06 6e 83 d3 44 47 50 c0 a8 00 08 13 88 0b d9 e0 59 9f ef 84 6b 41 c6 70 12 16 d0 37 e1 00 00 3 45 00 00 28 01 9c 40 00 80 06 1d ef c0 a8 00 08 d3 44 47 50 0b d9 13 88 84 6b 41 c6 e0 59 9f f0 50 f0 43 80 2b 32 00 00 4 45 00 00 38 01 9d 40 00 80 06 1d de c0 a8 00 08 d3 44 47 50 0b d9 13 88 84 6b 41 c6 e0 59 9f f0 50 18 43 80 e6 55 00 00 5 45 00 00 28 68 11 40 00 31 06 06 7a d3 44 47 50 c0 a8 00 08 13 88 0b d9 e0 59 9f f0 84 6b 41 d6 50 10 16 d0 57 d2 00 00 147-aIPHTCP 247-aIPS 347-aIPS4047-bIPH 47-b S 45 00 00 28 68 11 40 00 40 06 ec ad d3 44 47 50 ca 76 01 06 13 88 a1 08 e0 59 9f f0 84 6b 41 d6 50 10 16 d0 b7 d6 00 00 IPTCP47-a47-b bit 0 8 16 24 32 TTL IP IP 47-a IP 8 URGACKPSHRSTSYNFIN 47-b TCP 2801-5 BAABC21-25 DBCBB6-10 CCADA26-30 ADABC11-15 DDBDD31-35 ABBCA16-20 ACCCD36-40 BCADD4147 70 41.1 mn m+n-1 5 X-5X N X 2NN2 N N N-1 X-N+1X N 42.1 k k L1L2 L1L2 L=|L1-L2|L 152 C LinkList Search_First_Common(LinkList L1,LinkList L2)/int len1=Length(L1);,len2=Length(L2);LinkList longList,shortlist;/if(len1len2)longList=L1-next;shortlist=L2-next;L=len1-len2;/elselongList=L2-next;shortlist=L1-next;L=len2-len1;/While(L-)longList=longList-next;while(longList!=NULL)if(longList=shortList)/return longList;elselongList=longList-next;shortlist=shortlist-next;/whilereturn NULL;3O(len1+len2)O(1)43.1MIPS=CPU 10-6/CPI=80M/4=201.5,Cache 99%Cache=20M1.51%=300000 2DMA CPU20M/s1.54B=120MB/s 20M/s1.50.0005%=150 DMA 1504KB/4B=150K 3DMA DMA I/O 4 4 44B/50ns=320MB/s44.1x x=1111 1101 1111BR1=FDFFH 1 1111 1110 1111 1111BR1=FEFFH2 4+5-1=8 3I3 ID I3 I1 I2 I1 I2I3 16 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 I1 IF ID EX M WB I2 IF ID EXM WBI3 IF ID EXM WBI4 IF ID EX M WB I5 IF ID EX M WB I3 ID I4 IF I4 I3 ID I4 IF 4 2*x x=x*2+a I1 LOAD R1x I2 LOAD R2a I3 SHL R1 /ADD R1R1 I4 I5 ADD R1R2 STORE R2x 5 x=x*2+a1745.121 0 21212321110 1 32341 2 41414 46.14TB/1KB=23232/8=4B512B 512B/4B=128 1281KB=128KB2 2B 216 226B504B/6B=84 226B+84KB 4TB 4B 232 4TB 232 4TB47.147-a 134 IP 192.168.0.8c0a8 0008H 134 H 47-a 1 TCP FLAG 02HSYN=1ACK=0,seq=846b 41c5H2 TCP FLAG 12HSYN=1ACK=1seq=e059 9fefHack=846b 41c6H3 TCP FLAG10HACK=1seq=846b 41c6Hack=e059 9ff0H 123 TCP 17 46 35 4028H4646 35 2 3 TCP seq=846b 41c6H 5 TCP ack seq=846b 41d6H 5 846b 41d6H-846b 41c6H=10H=163 S IP=6811H47-a 5 S IP TTL=40H=645 TTL=31H=4964-49=15IP H 15 18