Click above to get retro games delivered to your door ever month!

FICOM           Integer compare                      Exceptions: I D
FICOMP          Integer compare and pop              C3 C2 C1 C0: * * * *

FICOM source
FICOMP source

                ; FICOM                 ; FICOMP
        Logic   CMP ST, source          CMP ST, source
                set condition codes     pop ST
                                        set condition codes

                C3 C1 C0
                0  0  0     ST > source
                0  0  1     ST < source
                1  0  0     ST = source
                1  1  1     ST not comparable to source

    FICOM/FICOMP compare the stack top to a word or short-integer memory
    operand and leave the result encoded in the status word as shown
    above. FICOMP also pops the stack.


    Opcode      Format
    DE /2       FICOM m16
    DA /2       FICOM m32
    DE /3       FICOMP m16
    DA /3       FICOMP m32


    Timing
    Variations/
    operand       8087         287        387      486     Pentium
    ficom  m16    (72-86)+EA  72-86      71-75    16-20    8/4     NP
    ficom  m32    (78-91)+EA  78-91      56-63    15-17    8/4     NP
    ficomp m16    (74-88)+EA  74-88      71-75    16-20    8/4     NP
    ficomp m32    (80-93)+EA  80-93      56-63    15-17    8/4     NP