unpack2_epi32
z8 = unpack2_epi32(y0, y1, y2, y3);
z9 = unpack2_epi32(y4, y5, y6, y7);
z10 = unpack2_epi32(y8, y9, y10, y11);
z11 = unpack2_epi32(y12, y13, y14, y15);
z8 = unpack2_epi32(y0, y1, y2, y3);
z9 = unpack2_epi32(y4, y5, y6, y7);
z10 = unpack2_epi32(y8, y9, y10, y11);
z11 = unpack2_epi32(y12, y13, y14, y15);