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Minimal test - lines (10, 41)

Code

int NS_FASTCALL Compare(const mozilla::detail::nsTStringRepr& aLhs,
                        const mozilla::detail::nsTStringRepr& aRhs,
                        const nsTStringComparator comp) {
  typedef typename nsTSubstring::size_type size_type;
  typedef typename nsTSubstring::const_iterator const_iterator;

  if (&aLhs == &aRhs) {
    return 0;
  }

  const_iterator leftIter, rightIter;
  aLhs.BeginReading(leftIter);
  aRhs.BeginReading(rightIter);

  size_type lLength = aLhs.Length();
  size_type rLength = aRhs.Length();
  size_type lengthToCompare = XPCOM_MIN(lLength, rLength);

  int result;
  if ((result = comp(leftIter.get(), rightIter.get(), lengthToCompare,
                     lengthToCompare)) == 0) {
    if (lLength < rLength) {
      result = -1;
    } else if (rLength < lLength) {
      result = 1;
    } else {
      result = 0;
    }
  }

  return result;
}

Minimal test - lines (53, 58)

Code

int nsTDefaultStringComparator(const T* aLhs, const T* aRhs, uint32_t aLLength,
                               uint32_t aRLength) {
  return aLLength == aRLength ? nsCharTraits::compare(aLhs, aRhs, aLLength)
         : (aLLength > aRLength) ? 1
                                 : -1;
}