mul_add_c2
mul_add_c2((a)[i], (a)[j], c0, c1, c2)
mul_add_c2((a)[i], (a)[j], c0, c1, c2)
mul_add_c2((a)[i], (a)[j], c0, c1, c2)
mul_add_c2((a)[i], (a)[j], c0, c1, c2)
mul_add_c2((a)[i], (a)[j], c0, c1, c2)