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(nasm.info)Section B.4.131

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B.4.131. `LAHF': Load AH from Flags
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     LAHF                          ; 9F                   [8086]

   `LAHF' sets the `AH' register according to the contents of the low
byte of the flags word.

   The operation of `LAHF' is:

      AH <-- SF:ZF:0:AF:0:PF:1:CF

   See also `SAHF' (*Note Section B.4.282::).