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(nasm.info)Section B.4.2

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B.4.2. `ADC': Add with Carry
----------------------------

     ADC r/m8,reg8                 ; 10 /r                [8086]
     ADC r/m16,reg16               ; o16 11 /r            [8086]
     ADC r/m32,reg32               ; o32 11 /r            [386]

     ADC reg8,r/m8                 ; 12 /r                [8086]
     ADC reg16,r/m16               ; o16 13 /r            [8086]
     ADC reg32,r/m32               ; o32 13 /r            [386]

     ADC r/m8,imm8                 ; 80 /2 ib             [8086]
     ADC r/m16,imm16               ; o16 81 /2 iw         [8086]
     ADC r/m32,imm32               ; o32 81 /2 id         [386]

     ADC r/m16,imm8                ; o16 83 /2 ib         [8086]
     ADC r/m32,imm8                ; o32 83 /2 ib         [386]

     ADC AL,imm8                   ; 14 ib                [8086]
     ADC AX,imm16                  ; o16 15 iw            [8086]
     ADC EAX,imm32                 ; o32 15 id            [386]

   `ADC' performs integer addition: it adds its two operands together,
plus the value of the carry flag, and leaves the result in its
destination (first) operand. The destination operand can be a register
or a memory location. The source operand can be a register, a memory
location or an immediate value.

   The flags are set according to the result of the operation: in
particular, the carry flag is affected and can be used by a subsequent
`ADC' instruction.

   In the forms with an 8-bit immediate second operand and a longer
first operand, the second operand is considered to be signed, and is
sign- extended to the length of the first operand. In these cases, the
`BYTE' qualifier is necessary to force NASM to generate this form of
the instruction.

   To add two numbers without also adding the contents of the carry
flag, use `ADD' (*Note Section B.4.3::).