libcrux_ml_kem_vector_portable_sub_b8
b = libcrux_ml_kem_vector_portable_sub_b8(a, &t);
libcrux_ml_kem_vector_portable_sub_b8(b, &a);
libcrux_ml_kem_vector_portable_sub_b8(myself->coefficients[i0],
libcrux_ml_kem_vector_portable_sub_b8(re->coefficients[j], &t);