for i := 0; i < len(src); i++ {
			dst[i] = m.SaturatingAdd(dst[i], src[i])
		}
	}
	ovf := m.overflow
	m.overflow = false
	return nil, ovf
}

// Saturating add does a saturating addition of 'dst' and 'src',
// returning added value or math.MaxUint32 if there is an overflow.
// Overflows are recorded in case the client needs to track them.
func (m *Merger) SaturatingAdd(dst, src uint32) uint32 {

	pcount := fm.p.unitTable[ukey]
	var result uint32
	if fm.cm == coverage.CtrModeSet {
		if count != 0 || pcount != 0 {
			result = 1
		}
	} else {
		// Use saturating arithmetic.
		result, _ = cmerge.SaturatingAdd(pcount, count)
	}
	fm.p.unitTable[ukey] = result
}

// sortUnits sorts a slice of extcu objects in a package according to
// source position information (e.g. file and line). Note that we don't