Appendix B Complete Flag Cross-Reference 컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴 Key to Codes T = instruction tests flag M = instruction modifies flag (either sets or resets depending on operands) 0 = instruction resets flag 1 = instruction sets flag 컴 = instruction's effect on flag is undefined R = instruction restores prior value of flag blank = instruction does not affect flag Instruction OF SF ZF AF PF CF TF IF DF NT RF AAA 컴 컴 컴 TM 컴 M AAD 컴 M M 컴 M 컴 AAM 컴 M M 컴 M 컴 AAS 컴 컴 컴 TM 컴 M ADC M M M M M TM ADD M M M M M M AND 0 M M 컴 M 0 ARPL M BOUND BSF/BSR 컴 컴 M 컴 컴 컴 BT/BTS/BTR/BTC 컴 컴 컴 컴 컴 M CALL CBW CLC 0 CLD 0 CLI 0 CLTS CMC M CMP M M M M M M CMPS M M M M M M T CWD DAA 컴 M M TM M TM DAS 컴 M M TM M TM DEC M M M M M DIV 컴 컴 컴 컴 컴 컴 ENTER ESC HLT IDIV 컴 컴 컴 컴 컴 컴 IMUL M 컴 컴 컴 컴 M IN INC M M M M M INS T INT 0 0 INTO T 0 0 IRET R R R R R R R R R T Jcond T T T T T JCXZ JMP LAHF LAR M LDS/LES/LSS/LFS/LGS LEA LEAVE LGDT/LIDT/LLDT/LMSW LOCK LODS T LOOP LOOPE/LOOPNE T LSL M LTR MOV MOV control, debug 컴 컴 컴 컴 컴 컴 MOVS T MOVSX/MOVZX MUL M 컴 컴 컴 컴 M NEG M M M M M M NOP NOT OR 0 M M 컴 M 0 OUT OUTS T POP/POPA POPF R R R R R R R R R R PUSH/PUSHA/PUSHF RCL/RCR 1 M TM RCL/RCR count 컴 TM REP/REPE/REPNE RET ROL/ROR 1 M M ROL/ROR count 컴 M SAHF R R R R R SAL/SAR/SHL/SHR 1 M M M 컴 M M SAL/SAR/SHL/SHR count 컴 M M 컴 M M SBB M M M M M TM SCAS M M M M M M T SET cond T T T T T SGDT/SIDT/SLDT/SMSW SHLD/SHRD 컴 M M 컴 M M STC 1 STD 1 STI 1 STOS T STR SUB M M M M M M TEST 0 M M 컴 M 0 VERR/VERRW M WAIT XCHG XLAT XOR 0 M M 컴 M 0 Appendix C Status Flag Summary 컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴 Status Flags' Functions Bit Name Function 0 CF Carry Flag 컴 Set on high-order bit carry or borrow; cleared otherwise. 2 PF Parity Flag 컴 Set if low-order eight bits of result contain an even number of 1 bits; cleared otherwise. 4 AF Adjust flag 컴 Set on carry from or borrow to the low order four bits of AL; cleared otherwise. Used for decimal arithmetic. 6 ZF Zero Flag 컴 Set if result is zero; cleared otherwise. 7 SF Sign Flag 컴 Set equal to high-order bit of result (0 is positive, 1 if negative). 11 OF Overflow Flag 컴 Set if result is too large a positive number or too small a negative number (excluding sign-bit) to fit in destination operand; cleared otherwise. Key to Codes T = instruction tests flag M = instruction modifies flag (either sets or resets depending on operands) 0 = instruction resets flag 컴 = instruction's effect on flag is undefined blank = instruction does not affect flag Instruction OF SF ZF AF PF CF AAA 컴 컴 컴 TM 컴 M AAS 컴 컴 컴 TM 컴 M AAD 컴 M M 컴 M 컴 AAM 컴 M M 컴 M 컴 DAA 컴 M M TM M TM DAS 컴 M M TM M TM ADC M M M M M TM ADD M M M M M M SBB M M M M M TM SUB M M M M M M CMP M M M M M M CMPS M M M M M M SCAS M M M M M M NEG M M M M M M DEC M M M M M INC M M M M M IMUL M 컴 컴 컴 컴 M MUL M 컴 컴 컴 컴 M RCL/RCR 1 M TM RCL/RCR count 컴 TM ROL/ROR 1 M M ROL/ROR count 컴 M SAL/SAR/SHL/SHR 1 M M M 컴 M M SAL/SAR/SHL/SHR count 컴 M M 컴 M M SHLD/SHRD 컴 M M 컴 M M BSF/BSR 컴 컴 M 컴 컴 컴 BT/BTS/BTR/BTC 컴 컴 컴 컴 컴 M AND 0 M M 컴 M 0 OR 0 M M 컴 M 0 TEST 0 M M 컴 M 0 XOR 0 M M 컴 M 0 Appendix D Condition Codes 컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� Note: The terms "above" and "below" refer to the relation between two unsigned values (neither SF nor OF is tested). The terms "greater" and "less" refer to the relation between two signed values (SF and OF are tested). 컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� Definition of Conditions (For conditional instructions Jcond, and SETcond) Instruction Condition Mnemonic Meaning Subcode Tested O Overflow 0000 OF = 1 NO No overflow 0001 OF = 0 B Below NAE Neither above nor equal 0010 CF = 1 NB Not below AE Above or equal 0011 CF = 0 E Equal Z Zero 0100 ZF = 1 NE Not equal NZ Not zero 0101 ZF = 0 BE Below or equal NA Not above 0110 (CF or ZF) = 1 NBE Neither below nor equal NA Above 0111 (CF or ZF) = 0 S Sign 1000 SF = 1 NS No sign 1001 SF = 0 P Parity PE Parity even 1010 PF = 1 NP No parity PO Parity odd 1011 PF = 0 L Less NGE Neither greater nor equal 1100 (SF xor OF) = 1 NL Not less GE Greater or equal 1101 (SF xor OF) = 0 LE Less or equal NG Not greater 1110 ((SF xor OF) or ZF) = 1 NLE Neither less nor equal G Greater 1111 ((SF xor OF) or ZF) = 0