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(nasm.info)Section B.4.265

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B.4.265. `PUSHFx': Push Flags Register
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     PUSHF                         ; 9C                   [8086]
     PUSHFD                        ; o32 9C               [386]
     PUSHFW                        ; o16 9C               [8086]

   * `PUSHFW' 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).

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

   `PUSHF' is an alias mnemonic for either `PUSHFW' or `PUSHFD',
depending on the current `BITS' setting.

   See also `POPF' (*Note Section B.4.246::).