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(nasm.info)Section B.4.3

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B.4.3. `ADD': Add Integers
--------------------------

     ADD r/m8,reg8                 ; 00 /r                [8086]
     ADD r/m16,reg16               ; o16 01 /r            [8086]
     ADD r/m32,reg32               ; o32 01 /r            [386]

     ADD reg8,r/m8                 ; 02 /r                [8086]
     ADD reg16,r/m16               ; o16 03 /r            [8086]
     ADD reg32,r/m32               ; o32 03 /r            [386]

     ADD r/m8,imm8                 ; 80 /0 ib             [8086]
     ADD r/m16,imm16               ; o16 81 /0 iw         [8086]
     ADD r/m32,imm32               ; o32 81 /0 id         [386]

     ADD r/m16,imm8                ; o16 83 /0 ib         [8086]
     ADD r/m32,imm8                ; o32 83 /0 ib         [386]

     ADD AL,imm8                   ; 04 ib                [8086]
     ADD AX,imm16                  ; o16 05 iw            [8086]
     ADD EAX,imm32                 ; o32 05 id            [386]

   `ADD' performs integer addition: it adds its two operands together,
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.