code: func coeffMulVectUpdate(c byte, data, parity []byte, cpuFeature int) {
  	switch cpuFeature {
  	case avx512:
  		tbl := lowHighTbl[c][:]
  		coeffMulVectUpdateAVX512(tbl, data, parity)
  	case avx2:
  		tbl := lowHighTbl[c][:]
  		coeffMulVectUpdateAVX2(tbl, data, parity)
  	default:
  		coeffMulVectUpdateBase(c, data, parity)
  	}
  }
docs: // parity = parity xor (c * data)