5 files changed, 16 insertions, 3 deletions
diff --git a/src/corelib/itemmodels/qabstractitemmodel.cpp b/src/corelib/itemmodels/qabstractitemmodel.cpp
index 2f3cfc1c0a..90297b9115 100644
--- a/src/corelib/itemmodels/qabstractitemmodel.cpp
+++ b/src/corelib/itemmodels/qabstractitemmodel.cpp
@@ -3222,6 +3222,7 @@ QModelIndexList QAbstractItemModel::persistentIndexList() const
 {
     Q_D(const QAbstractItemModel);
     QModelIndexList result;
+    result.reserve(d->persistent.indexes.count());
     for (QHash<QModelIndex, QPersistentModelIndexData *>::const_iterator it = d->persistent.indexes.constBegin();
          it != d->persistent.indexes.constEnd(); ++it) {
         QPersistentModelIndexData *data = *it;
diff --git a/src/corelib/itemmodels/qabstractproxymodel.cpp b/src/corelib/itemmodels/qabstractproxymodel.cpp
index 4d08306d28..dbbbbb8ff4 100644
--- a/src/corelib/itemmodels/qabstractproxymodel.cpp
+++ b/src/corelib/itemmodels/qabstractproxymodel.cpp
@@ -379,6 +379,7 @@ QMimeData* QAbstractProxyModel::mimeData(const QModelIndexList &indexes) const
 {
     Q_D(const QAbstractProxyModel);
     QModelIndexList list;
+    list.reserve(indexes.count());
     foreach(const QModelIndex &index, indexes)
         list << mapToSource(index);
     return d->model->mimeData(list);
diff --git a/src/corelib/itemmodels/qidentityproxymodel.cpp b/src/corelib/itemmodels/qidentityproxymodel.cpp
index f773219aeb..f46fd135ca 100644
--- a/src/corelib/itemmodels/qidentityproxymodel.cpp
+++ b/src/corelib/itemmodels/qidentityproxymodel.cpp
@@ -212,6 +212,7 @@ QItemSelection QIdentityProxyModel::mapSelectionFromSource(const QItemSelection&
 
     QItemSelection::const_iterator it = selection.constBegin();
     const QItemSelection::const_iterator end = selection.constEnd();
+    proxySelection.reserve(selection.count());
     for ( ; it != end; ++it) {
         Q_ASSERT(it->model() == d->model);
         const QItemSelectionRange range(mapFromSource(it->topLeft()), mapFromSource(it->bottomRight()));
@@ -234,6 +235,7 @@ QItemSelection QIdentityProxyModel::mapSelectionToSource(const QItemSelection& s
 
     QItemSelection::const_iterator it = selection.constBegin();
     const QItemSelection::const_iterator end = selection.constEnd();
+    sourceSelection.reserve(selection.count());
     for ( ; it != end; ++it) {
         Q_ASSERT(it->model() == this);
         const QItemSelectionRange range(mapToSource(it->topLeft()), mapToSource(it->bottomRight()));
@@ -269,6 +271,7 @@ QModelIndexList QIdentityProxyModel::match(const QModelIndex& start, int role, c
     QModelIndexList::const_iterator it = sourceList.constBegin();
     const QModelIndexList::const_iterator end = sourceList.constEnd();
     QModelIndexList proxyList;
+    proxyList.reserve(sourceList.count());
     for ( ; it != end; ++it)
         proxyList.append(mapFromSource(*it));
     return proxyList;
diff --git a/src/corelib/itemmodels/qsortfilterproxymodel.cpp b/src/corelib/itemmodels/qsortfilterproxymodel.cpp
index 922d0f1622..15798d5293 100644
--- a/src/corelib/itemmodels/qsortfilterproxymodel.cpp
+++ b/src/corelib/itemmodels/qsortfilterproxymodel.cpp
@@ -1011,6 +1011,7 @@ QModelIndexPairList QSortFilterProxyModelPrivate::store_persistent_indexes()
 {
     Q_Q(QSortFilterProxyModel);
     QModelIndexPairList source_indexes;
+    source_indexes.reserve(persistent.indexes.count());
     foreach (QPersistentModelIndexData *data, persistent.indexes) {
         QModelIndex proxy_index = data->index;
         QModelIndex source_index = q->mapToSource(proxy_index);
@@ -1030,7 +1031,10 @@ void QSortFilterProxyModelPrivate::update_persistent_indexes(
 {
     Q_Q(QSortFilterProxyModel);
     QModelIndexList from, to;
-    for (int i = 0; i < source_indexes.count(); ++i) {
+    const int numSourceIndexes = source_indexes.count();
+    from.reserve(numSourceIndexes);
+    to.reserve(numSourceIndexes);
+    for (int i = 0; i < numSourceIndexes; ++i) {
         QModelIndex source_index = source_indexes.at(i).second;
         QModelIndex old_proxy_index = source_indexes.at(i).first;
         create_mapping(source_index.parent());
@@ -2013,7 +2017,9 @@ QMimeData *QSortFilterProxyModel::mimeData(const QModelIndexList &indexes) const
 {
     Q_D(const QSortFilterProxyModel);
     QModelIndexList source_indexes;
-    for (int i = 0; i < indexes.count(); ++i)
+    const int numIndexes = indexes.count();
+    source_indexes.reserve(numIndexes);
+    for (int i = 0; i < numIndexes; ++i)
         source_indexes << mapToSource(indexes.at(i));
     return d->model->mimeData(source_indexes);
 }
diff --git a/src/corelib/itemmodels/qstringlistmodel.cpp b/src/corelib/itemmodels/qstringlistmodel.cpp
index 2853be3fda..dad736b445 100644
--- a/src/corelib/itemmodels/qstringlistmodel.cpp
+++ b/src/corelib/itemmodels/qstringlistmodel.cpp
@@ -257,7 +257,9 @@ void QStringListModel::sort(int, Qt::SortOrder order)
     emit layoutAboutToBeChanged(QList<QPersistentModelIndex>(), VerticalSortHint);
 
     QList<QPair<QString, int> > list;
-    for (int i = 0; i < lst.count(); ++i)
+    const int lstCount = lst.count();
+    list.reserve(lstCount);
+    for (int i = 0; i < lstCount; ++i)
         list.append(QPair<QString, int>(lst.at(i), i));
 
     if (order == Qt::AscendingOrder)