A.5.83 FILD, FIST, FISTP: Floating-Point/Integer Conversion
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.