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(nasm.info)Section 3.5.6

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3.5.6. `*', `/', `//', `%' and `%%': Multiplication and Division
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   `*' is the multiplication operator. `/' and `//' are both division
operators: `/' is unsigned division and `//' is signed division.
Similarly, `%' and `%%' provide unsigned and signed modulo operators
respectively.

   NASM, like ANSI C, provides no guarantees about the sensible
operation of the signed modulo operator.

   Since the `%' character is used extensively by the macro
preprocessor, you should ensure that both the signed and unsigned
modulo operators are followed by white space wherever they appear.