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(nasm.info)Section B.4.81

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B.4.81. `FICOM', `FICOMP': Floating-Point/Integer Compare
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     FICOM mem16                   ; DE /2                [8086,FPU]
     FICOM mem32                   ; DA /2                [8086,FPU]

     FICOMP mem16                  ; DE /3                [8086,FPU]
     FICOMP mem32                  ; DA /3                [8086,FPU]

   `FICOM' compares `ST0' with the 16-bit or 32-bit integer stored in
the given memory location, and sets the FPU flags accordingly.
`FICOMP' does the same, but pops the register stack afterwards.