ctm_to_twos_complement
ctm_to_twos_complement(input[3], 0, 12));
ctm_to_twos_complement(input[7], 0, 12));
ctm_to_twos_complement(input[11], 0, 12));
csc->coeff[i] = ctm_to_twos_complement(ctm->matrix[i], 2, 10);
csc->coeff[i] = ctm_to_twos_complement(ctm->matrix[i], 4, 12);