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(nasm.info)Section B.4.282

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B.4.282. `SAHF': Store AH to Flags
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     SAHF                          ; 9E                   [8086]

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

   The operation of `SAHF' is:

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

   See also `LAHF' (*Note Section B.4.131::).