NASM 2.05 based x86 Instruction Reference[ch104]

A.5.84 FIMUL: Floating-Point/Integer Multiplication FIMUL mem16 ; DE /1 [8086,FPU] FIMUL mem32 ; DA /1 [8086,FPU] FIMUL multiplies ST0 by the 16-bit or 32-bit integer stored in the given memory location, and stores the result in ST0.