unpack0_epi32
z0 = unpack0_epi32(y0, y1, y2, y3);
z1 = unpack0_epi32(y4, y5, y6, y7);
z2 = unpack0_epi32(y8, y9, y10, y11);
z3 = unpack0_epi32(y12, y13, y14, y15);
z0 = unpack0_epi32(y0, y1, y2, y3);
z1 = unpack0_epi32(y4, y5, y6, y7);
z2 = unpack0_epi32(y8, y9, y10, y11);
z3 = unpack0_epi32(y12, y13, y14, y15);