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(nasm.info)Section B.4.189

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B.4.189. `NEG', `NOT': Two's and One's Complement
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     NEG r/m8                      ; F6 /3                [8086]
     NEG r/m16                     ; o16 F7 /3            [8086]
     NEG r/m32                     ; o32 F7 /3            [386]

     NOT r/m8                      ; F6 /2                [8086]
     NOT r/m16                     ; o16 F7 /2            [8086]
     NOT r/m32                     ; o32 F7 /2            [386]

   `NEG' replaces the contents of its operand by the two's complement
negation (invert all the bits and then add one) of the original value.
`NOT', similarly, performs one's complement (inverts all the bits).