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(nasm.info)Section B.4.120

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B.4.120. `INC': Increment Integer
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     INC reg16                     ; o16 40+r             [8086]
     INC reg32                     ; o32 40+r             [386]
     INC r/m8                      ; FE /0                [8086]
     INC r/m16                     ; o16 FF /0            [8086]
     INC r/m32                     ; o32 FF /0            [386]

   `INC' adds 1 to its operand. It does _not_ affect the carry flag: to
affect the carry flag, use `ADD something,1' (see *Note Section
B.4.3::). `INC' affects all the other flags according to the result.

   This instruction can be used with a `LOCK' prefix to allow atomic
execution.

   See also `DEC' (*Note Section B.4.58::).