A.5.82 FIDIV, FIDIVR: Floating-Point/Integer Division
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.