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POPF            Pop Flags from Stack                 Flags: O D I T S Z A P C
                                                            * * * * * * * * *
POPF                                                 IOv86
POPFD  (CPU: 386+)                                   IOv86

        Logic   POP eFLAGS

    POPF/POPFD pops the word or doubleword on the top of the stack and
    stores the value in the flags register. If the operand-size
    attribute of the instruction is 16 bits, then a word is popped and
    the value stored in FLAGS. If the operand-size attribute is 32
    bits, then a doubleword is popped and the value stored in EFLAGS.

    The RF and VM flags (bits 16 and 17 of EFLAGS) cannot be changed
    by the POPFD instruction.


    Protected mode
    The I/O privilege level (IOPL -- bits 12,13 of FLAGS) is changed
    only when executing at privilege level zero (CPL=0). The interrupt
    flag (IF) is changed only when executing at a level at least as
    privileged as the IOPL (real-address mode is equivalent to CPL=0).
    If a POPF instruction is executed with insufficient privilege, an
    exception does not occur, but the privileged bits are not altered.
    This instruction is IOPL-sensitive in V86 mode.


    Note
    Some assemblers support a POPF extension (POPFW) that forces a
    16-bit word-style pop regardless of the code segment's size
    attribute (80386+).


    Opcode      Format
    9D          POPF
    9D          POPFD


    Length and timing
    Variations  Bytes   8088    186     286     386     486     Pentium
    popf         1      12       8       5       5       9       6   NP
    popfd        1       -       -       -       5       9       6   NP

                             Protected Mode

                Bytes                   286     386     486     Pentium
    popf         1                       5       5       6       4   NP
    popfd        1                       -       5       6       4   NP