pushf

8086 and later

Push Flags Register

pushf

PUSHFW pushes the bottom 16 bits of the flags register (or the whole flags register, on processors below a 386) onto the stack.
PUSHFD pushes the entire flags register onto the stack.

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

Forms

Every form of pushf the assembler accepts, from NASM's own instruction table. The second column is the processor that introduced the form; a badge marks a form that needs an extension, that is lockable, or that long mode dropped.

Form	Since	Notes
pushf	8086