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(nasm.info)Section B.4.83

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B.4.83. `FILD', `FIST', `FISTP': Floating-Point/Integer Conversion
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     FILD mem16                    ; DF /0                [8086,FPU]
     FILD mem32                    ; DB /0                [8086,FPU]
     FILD mem64                    ; DF /5                [8086,FPU]

     FIST mem16                    ; DF /2                [8086,FPU]
     FIST mem32                    ; DB /2                [8086,FPU]

     FISTP mem16                   ; DF /3                [8086,FPU]
     FISTP mem32                   ; DB /3                [8086,FPU]
     FISTP mem64                   ; DF /7                [8086,FPU]

   `FILD' loads an integer out of a memory location, converts it to a
real, and pushes it on the FPU register stack. `FIST' converts `ST0' to
an integer and stores that in memory; `FISTP' does the same as `FIST',
but pops the register stack afterwards.