比较双精度数2p与q如果2pq

比较双精度数2p与q如果2pq 3.29 (1) LEA SI, CONAME LEA DI, PRLINE MOV CX, 20 CLD REP MOVSB (2) LEA SI, CONAME+19 LEA DI, PRLINE+19 MOV CX,20 STD REP MOVSB (3) LEA SI, CONAME+2 LODSW (4) LEA DI, PRLINE+5 STOSW (5) LEA DI, CONAME MOV AL, 20H MOV CX, 20 CLD REPNE SCASB JNZ NEXT DEC DI MOV BH, ES:[DI] NEXT: 3.30 LEA DI, STRING MOV AL, ‘&’ MOV CX,19 CLD REPNE SCASB JNZ NEXT DEC DI MOV ES:[DI], 20H NEXT: 3.31 (1) LEA DI, PRINT_LINE MOV AL, 20H MOV CX, 132 CLD REP STOSB (2) LEA DI, STUDENT_ADDR MOV AL, ‘_’ MOV CX, 9 CLD REPNE SCASB (3) LEA DI, STUDENT_ADDR+8 MOV AL, ‘_’ MOV CX, 9 STD REPNE SCASB (4) LEA DI, STUDENT_NAME MOV AL, 20H MOV CX, 30 CLD REPE SCASB JNZ NEXT LEA DI, STUDENT_NAME MOV AL, ‘*’ MOV CX, 30 CLD REP STOSB NEXT: (5) LEA SI, STUENT_NAME LEA DI, PRINT_LINE MOV CX, 30 CLD REP MOVSB LEA SI, STUDENT_ADDR+8 LEA DI, PRINT_LINE+131 MOV CX, 9 STD REP MOVSB 3.32 LEA SI, OLDS LEA DI, NEWS MOV CX, 5 CLD REPE CMPSB JNZ NEW_LESS …. NEW_LESS: 3.33 (1) CMP DX, CX JA EXCEED (2) CMP BX, AX JG EXCEED (3) CMP CX, 0 JZ ZERO (4) CMP BX, AX JO OVERFLOW (5) CMP BX, AX JLE EQ_SMA (6) CMP DX, CX JBE EQ_SMA 3.34 (1) L1 (2) L1 (3) L2 (4) L3 (5) L5 3.35 (1) JNB, JBE, JNL, JLE (2) JNB, JBE, JNL, JLE (3) JNB, JNBE, JL, JLE (4) JNB, JNBE, JNL, JNLE (5) JNB, JNBE, JNL, JNLE (6) JB, JBE, JL, JLE (7) JB, JBE, JL, JLE (8) JNB, JNBE, JL, JLE 3.36 比较双精度数2p与q。如果2p，q, 则AX置为1;如果2p?q, 则AX置为2。 3.37 Y 三位为1, ROUTINE_1 N Y 两位为1, ROUTINE_2 N Y 一位为1, ROUTINE_3 N ROUTINE_4 MOV AL, STATUS NOT AL TEST AL, 0010 1010B JZ ROUTINE_1 TEST AL, 0000 1010B JZ ROUTINE_2 TEST AL, 0010 0010B JZ ROUTINE_2 TEST AL, 0010 1000B JZ ROUTINE_2 TEST AL, 0000 0010B JZ ROUTINE_3 TEST AL, 0000 1000B JZ ROUTINE_3 TEST AL, 0010 0000B JZ ROUTINE_3 ROUTINE_4: …. ROUTINE_1: … ROUTINE_2: … ROUTINE_3: … 3.38 (1) (AX)=05H, (BX)=10H, (CX)=00H, (DX)=00H (2) (AX)=02H, (BX)=04H, (CX)=03H, (DX)=01H (3) (AX)=03H, (BX)=07H, (CX)=02H, (DX)=00H 3.39 (1) SP SP 0100H 00FEH 0400H MAIN 调用SUBA前 MAIN 调用SUBA后 (2) (3) SP SP 00FCH 00F8H 0100H B200H 0A00H 0A00H 0400H 0400H SUBA调用SUBB后 SUBB调用SUBC后 (4) (5) SP SP 00FCH 00FAH 0100H 0100H B200H 0C00H 0A00H 0A00H 0400H 0400H 从SUBC返回SUBB后 SUBB调用SUBD后 (6) (7) SP SP 00FCH 00FEH 0100H 0100H 0C00H 0C00H 0A00H 0A00H 0400H 0400H 从SUBD返回SUBB后 从SUBB返回SUBA后 (8) (9) SP SP 0100H 00FCH 0100H 0100H 0C00H 0C00H 0A00H 0600H 0400H 1000H 从SUBA返回MAIN后 MAIN调用SUBC后 3.41 (1) 在DS段中从偏移地址为2000H的单元开始的4个字节单元依次存储的内容为56H，0F4H，23H 和98H。 (2) 在DS段中从偏移地址为348CH的单元开始的4个字节单元依次存储的内容为91H，34H，0F2H 和01H。 (3) (EBX)=4CA26D92H 3.42 (1) AX寄存器的内容进栈。 (2) 将一个双字出栈，并送ESI寄存器。 (3) 将数据段中(BX)所指向的字单元内容进栈。 (4) 所有寄存器进栈。 (5) 将一个字出栈，并送DS寄存器。 (6) 将立即数4进栈。 3.43 (1) (EAX)=2CEFF93H (2) (EBX)=3EB00000H (3) (EAX)=09090804H (4) (EDX)=006F13ADH 3.44 (1) (EBX)=0FFFF FFF4H (2) (EDX)=0FFFF FFF8H (3) (ECX)=0000 0007H (4) (EBX)=0000 0099H 3.45 (EAX)=0000 0000H ; (EBX)=0000 0019H 3.46 (AX)=0003H ; (DX)=0007H 3.47 ADD ECX, EDX ADC ECX, ESI MOV EDI, ECX 3.48 (BX) ? (DX) * 100H 3.49 MOV AL, BL CBW IDIV CL MOV DL, 2 IMUL DL MOV DX, AX 3.50 JMP DI 则执行该指令后，(IP)=(DI)。 JMP [DI] 则执行该指令后，(IP)=(16d×(DS)，(DI))。 3.51 MOV CX, 100H MOV AL, 0 MOV BL, 0 MOV SI, 0 LOOP1: CMP ARRAY[SI], 42H JA NEXT1 JB NEXT2 JZ NEXT3 NEXT1: INC AL JMP SHORT NEXT3 NEXT2: INC BL NEXT3: INC SI LOOP LOOP1 MOV UP, AL MOV DOWN, BL