a[0] <- [x.re, x.im, y.re, y.im] b[0] <- [z.re, z.im, w.re, w.im]
return: sum of (x*z + y*w)
See Implementation
a[0] <- [x.re, x.im, y.re, y.im] b[0] <- [z.re, z.im, w.re, w.im]
return: sum of (x*z + y*w)