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(nasm.info)Section B.4.246

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B.4.246. `POPFx': Pop Flags Register
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     POPF                          ; 9D                   [8086]
     POPFW                         ; o16 9D               [8086]
     POPFD                         ; o32 9D               [386]

   * `POPFW' pops a word from the stack and stores it in the bottom 16
     bits of the flags register (or the whole flags register, on
     processors below a 386).

   * `POPFD' pops a doubleword and stores it in the entire flags
     register.

   `POPF' is an alias mnemonic for either `POPFW' or `POPFD', depending
on the current `BITS' setting.

   See also `PUSHF' (*Note Section B.4.265::).