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(nasm.info)Section B.4.13

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B.4.13. `ARPL': Adjust RPL Field of Selector
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     ARPL r/m16,reg16              ; 63 /r                [286,PRIV]

   `ARPL' expects its two word operands to be segment selectors. It
adjusts the `RPL' (requested privilege level - stored in the bottom two
bits of the selector) field of the destination (first) operand to
ensure that it is no less (i.e. no more privileged than) the `RPL'
field of the source operand. The zero flag is set if and only if a
change had to be made.


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