NASM 2.05 based x86 Instruction Reference[ch100]

A.5.80 FIADD: Floating-Point/Integer Addition FIADD mem16 ; DE /0 [8086,FPU] FIADD mem32 ; DA /0 [8086,FPU] FIADD adds the 16-bit or 32-bit integer stored in the given memory location to ST0, storing the result in ST0.