fadd{ls}
Add stack element 7 to stack element 0 and return the sum to stack element 0.
fadd %st(7), %st
faddp
Add stack element 0 to stack element 7 and return the sum to stack element 7, then pop the stack.
faddp %st, %st(7)
fiadd{l}
Add the integer contents of register ECX to stack element 0.
fiadd 2(%ecx)