macro ffa [xm,a,b] {
movss xmm#xm,[initFilter#.#a]
mulss xmm#xm,[filter#.#b]
} 

ffa 2,a,x,3,b,y,4,c,z
    

xmm2 = a0 * x[0] + a1 * x[1] + a2 * x[2]    

macro ffa [xm,a,b] { common xorps xmm7,xmm7
forward
@xmregtt equ xm
movss xmm#xm,[initFilter#.#a]
mulss xmm#xm,[filter#.#b]

common irpv v,@xmregtt \{ addss xmm7,xmm\#\v \}
common irpv v,@xmregtt \{ restore @xmregtt \}
}    

macro ffa [xm,a,b] { common xorps xmm7,xmm7
forward
movss xmm#xm,[initFilter#.#a]
mulss xmm#xm,[filter#.#b]
forward addss xmm7,xmm#xm
}

macro ffa [xm,a,b] { common xorps xmm7,xmm7
forward
movss xmm#xm,[initFilter#.#a]
mulss xmm#xm,[filter#.#b]
addss xmm7,xmm#xm
}    

macro xmmul [r,a,b] {
if a eqtype 0
movss xmm#r,xmm#a
else
movss xmm#r,[a]
end if
mulss xmm#r,[b]
}

;in code
.a1 dd 2.0
.prevI dd 0
xmmul 3,.a1,.prevI,4,2,.a1

;fasm error movss xmm3,xmm.a1
I expected movss xmm3,[.a1]