LAHF            Load Register AH from Flags          Flags: Not altered

LAHF

        Logic    AH bits    ←    Flag-reg bits
                7 6 4 2 0   ←      S Z A P C

    LAHF transfers the low byte of the flags register to AH. The flags
    themselves are not changed by this instruction.

    Note
    After this instruction is executed, bits 1, 3 and 5 of AH are
    undefined.


    Opcode      Format
    9F          LAHF


    Length and timing
    Operands    Bytes   8088    186     286     386     486     Pentium
    -             1      4       2       2       2       3       2   NP