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(nasm.info)Section B.4.87

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B.4.87. `FISUB': Floating-Point/Integer Subtraction
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     FISUB mem16                   ; DE /4                [8086,FPU]
     FISUB mem32                   ; DA /4                [8086,FPU]

     FISUBR mem16                  ; DE /5                [8086,FPU]
     FISUBR mem32                  ; DA /5                [8086,FPU]

   `FISUB' subtracts the 16-bit or 32-bit integer stored in the given
memory location from `ST0', and stores the result in `ST0'.  `FISUBR'
does the subtraction the other way round, i.e. it subtracts `ST0' from
the given integer, but still stores the result in `ST0'.