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(nasm.info)Section B.4.82

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B.4.82. `FIDIV', `FIDIVR': Floating-Point/Integer Division
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     FIDIV mem16                   ; DE /6                [8086,FPU]
     FIDIV mem32                   ; DA /6                [8086,FPU]

     FIDIVR mem16                  ; DE /7                [8086,FPU]
     FIDIVR mem32                  ; DA /7                [8086,FPU]

   `FIDIV' divides `ST0' by the 16-bit or 32-bit integer stored in the
given memory location, and stores the result in `ST0'.  `FIDIVR' does
the division the other way up: it divides the integer by `ST0', but
still stores the result in `ST0'.