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(nasm.info)Section B.4.14

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B.4.14. `BOUND': Check Array Index against Bounds
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     BOUND reg16,mem               ; o16 62 /r            [186]
     BOUND reg32,mem               ; o32 62 /r            [386]

   `BOUND' expects its second operand to point to an area of memory
containing two signed values of the same size as its first operand (i.e.
two words for the 16-bit form; two doublewords for the 32-bit form). It
performs two signed comparisons: if the value in the register passed as
its first operand is less than the first of the in-memory values, or is
greater than or equal to the second, it throws a `BR' exception.
Otherwise, it does nothing.