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AMD64 Technology 24594 Rev. 3.10 February 2005AADASCII Adjust Before DivisionConverts two unpacked BCD digits in the AL (least significant) and AH (mostsignificant) registers to a single binary value in the AL register using the followingformula:AL = ((10d * AH) + (AL))After the conversion, AH is cleared to 00h.In most modern assemblers, the AAD instruction adjusts from base-10 values.However, by coding the instruction directly in binary, it can adjust from any basespecified by the immediate byte value (ib) suffixed onto the D5h opcode. For example,code D508h for octal, D50Ah for decimal, and D50Ch for duodecimal (base 12).Using this instruction in 64-bit mode generates an invalid-opcode exception.Mnemonic Opcode DescriptionAAD(None)Related InstructionsAAA, AAM, AASrFLAGS AffectedD5 0AD5 ibAdjust two BCD digits in AL and AH.(Invalid in 64-bit mode.)Adjust two BCD digits to the immediate byte base.(Invalid in 64-bit mode.)ID VIP VIF AC VM RF NT IOPL OF DF IF TF SF ZF AF PF CFExceptionsU M M U M U21 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.62 AAD
24594 Rev. 3.10 February 2005 AMD64 TechnologyAAMASCII Adjust After MultiplyConverts the value in the AL register from binary to two unpacked BCD digits in theAH (most significant) and AL (least significant) registers using the following formula:AH = (AL/10d)AL = (AL mod 10d).In most modern assemblers, the AAM instruction adjusts to base-10 values. However,by coding the instruction directly in binary, it can adjust to any base specified by theimmediate byte value (ib) suffixed onto the D4h opcode. For example, code D408h foroctal, D40Ah for decimal, and D40Ch for duodecimal (base 12).Using this instruction in 64-bit mode generates an invalid-opcode exception.Mnemonic Opcode DescriptionAAM(None)Related InstructionsAAA, AAD, AASrFLAGS AffectedD4 0AD4 ibCreate a pair of unpacked BCD values in AH and AL.(Invalid in 64-bit mode.)Create a pair of unpacked values to the immediate byte base.(Invalid in 64-bit mode.)ID VIP VIF AC VM RF NT IOPL OF DF IF TF SF ZF AF PF CFExceptionsU M M U M U21 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. Unaffected flags are blank. Undefined flags are U.Exception RealVirtual8086 Protected Cause of ExceptionDivide by zero, #DE X X X 8-bit immediate value was 0.Invalid opcode, #UD X This instruction was executed in 64-bit mode.AAM 63
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