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AMD64 Technology 24594 Rev. 3.10 February 2005AASASCII Adjust After SubtractionAdjusts the value in the AL register to an unpacked BCD value. Use the AASinstruction after using the SUB instruction to subtract two unpacked BCD numbers.If the value in AL is greater than 9 or the AF flag is set to 1, the instructiondecrements the value in AH, subtracts 6 from the AL register, and sets the CF and AFflags to 1. Otherwise, it clears the CF and AF flags and the AH register is unchanged.In either case, the instruction clears bits 7–4 of the AL register, leaving the correctdecimal digit in bits 3–0.Using this instruction in 64-bit mode generates an invalid-opcode exception.Mnemonic Opcode DescriptionAASRelated InstructionsAAA, AAD, AAMrFLAGS Affected3FCreate an unpacked BCD number from the contents of the ALregister.(Invalid in 64-bit mode.)ID VIP VIF AC VM RF NT IOPL OF DF IF TF SF ZF AF PF CFExceptionsU U U M U M21 20 19 18 17 16 14 13–12 11 10 9 8 7 6 4 2 0Note: Bits 31–22, 15, 5, 3, and 1 are reserved. A flag set to 1 or cleared to 0 is M (modified). Unaffected flags are blank. Undefinedflags are U.VirtualException Real 8086 Protected Cause of ExceptionInvalid opcode, #UD X This instruction was executed in 64-bit mode.64 AAS
24594 Rev. 3.10 February 2005 AMD64 TechnologyADCAdd with CarryAdds the carry flag (CF), the value in a register or memory location (first operand),and an immediate value or the value in a register a memory location (secondoperand), and stores the result in the first operand location. The instruction cannotadd two memory operands. The CF flag indicates a pending carry from a previousaddition operation. The instruction sign-extends an immediate value to the length ofthe destination register or memory location.This instruction evaluates the result for both signed and unsigned data types and setsthe OF and CF flags to indicate a carry in a signed or unsigned result, respectively. Itsets the SF flag to indicate the sign of a signed result.Use the ADC instruction after an ADD instruction as part of a multibyte or multiwordaddition.The forms of the ADC instruction that write to memory support the LOCK prefix. Fordetails about the LOCK prefix, see “Lock Prefix” on page 10.Mnemonic Opcode DescriptionADC AL, imm8 14 ib Add imm8 to AL + CF.ADC AX, imm16 15 iw Add imm16 to AX + CF.ADC EAX, imm32 15 id Add imm32 to EAX + CF.ADC RAX, imm32 15 id Add sign-extended imm32 to RAX + CF.ADC reg/mem8, imm8 80 /2 ib Add imm8 to reg/mem8 + CF.ADC reg/mem16, imm16 81 /2 iw Add imm16 to reg/mem16 + CF.ADC reg/mem32, imm32 81 /2 id Add imm32 to reg/mem32 + CF.ADC reg/mem64, imm32 81 /2 id Add sign-extended imm32 to reg/mem64 + CF.ADC reg/mem16, imm8 83 /2 ib Add sign-extended imm8 to reg/mem16 + CF.ADC reg/mem32, imm8 83 /2 ib Add sign-extended imm8 to reg/mem32 + CF.ADC reg/mem64, imm8 83 /2 ib Add sign-extended imm8 to reg/mem64 + CF.ADC reg/mem8, reg8 10 /r Add reg8 to reg/mem8 + CFADC reg/mem16, reg16 11 /r Add reg16 to reg/mem16 + CF.ADC reg/mem32, reg32 11 /r Add reg32 to reg/mem32 + CF.ADC 65
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