1 files changed, 17 insertions, 5 deletions
diff --git a/src/widgets/itemviews/qlistwidget.cpp b/src/widgets/itemviews/qlistwidget.cpp
index 66f965aa54..0e1e56e966 100644
--- a/src/widgets/itemviews/qlistwidget.cpp
+++ b/src/widgets/itemviews/qlistwidget.cpp
@@ -299,7 +299,10 @@ void QListModel::sort(int column, Qt::SortOrder order)
     std::sort(sorting.begin(), sorting.end(), compare);
     QModelIndexList fromIndexes;
     QModelIndexList toIndexes;
-    for (int r = 0; r < sorting.count(); ++r) {
+    const int sortingCount = sorting.count();
+    fromIndexes.reserve(sortingCount);
+    toIndexes.reserve(sortingCount);
+    for (int r = 0; r < sortingCount; ++r) {
         QListWidgetItem *item = sorting.at(r).first;
         toIndexes.append(createIndex(r, 0, item));
         fromIndexes.append(createIndex(sorting.at(r).second, 0, sorting.at(r).first));
@@ -423,7 +426,9 @@ QMimeData *QListModel::internalMimeData()  const
 QMimeData *QListModel::mimeData(const QModelIndexList &indexes) const
 {
     QList<QListWidgetItem*> itemlist;
-    for (int i = 0; i < indexes.count(); ++i)
+    const int indexesCount = indexes.count();
+    itemlist.reserve(indexesCount);
+    for (int i = 0; i < indexesCount; ++i)
         itemlist << at(indexes.at(i).row());
     const QListWidget *view = qobject_cast<const QListWidget*>(QObject::parent());
 
@@ -1694,7 +1699,9 @@ QList<QListWidgetItem*> QListWidget::selectedItems() const
     Q_D(const QListWidget);
     QModelIndexList indexes = selectionModel()->selectedIndexes();
     QList<QListWidgetItem*> items;
-    for (int i = 0; i < indexes.count(); ++i)
+    const int numIndexes = indexes.count();
+    items.reserve(numIndexes);
+    for (int i = 0; i < numIndexes; ++i)
         items.append(d->listModel()->at(indexes.at(i).row()));
     return items;
 }
@@ -1710,7 +1717,9 @@ QList<QListWidgetItem*> QListWidget::findItems(const QString &text, Qt::MatchFla
     QModelIndexList indexes = d->listModel()->match(model()->index(0, 0, QModelIndex()),
                                                 Qt::DisplayRole, text, -1, flags);
     QList<QListWidgetItem*> items;
-    for (int i = 0; i < indexes.size(); ++i)
+    const int indexesSize = indexes.size();
+    items.reserve(indexesSize);
+    for (int i = 0; i < indexesSize; ++i)
         items.append(d->listModel()->at(indexes.at(i).row()));
     return items;
 }
@@ -1795,6 +1804,7 @@ QMimeData *QListWidget::mimeData(const QList<QListWidgetItem*> items) const
 
     // if non empty, it's called from the model's own mimeData
     if (cachedIndexes.isEmpty()) {
+        cachedIndexes.reserve(items.count());
         foreach (QListWidgetItem *item, items)
             cachedIndexes << indexFromItem(item);
 
@@ -1845,7 +1855,9 @@ void QListWidget::dropEvent(QDropEvent *event) {
         if (d->dropOn(event, &row, &col, &topIndex)) {
             QList<QModelIndex> selIndexes = selectedIndexes();
             QList<QPersistentModelIndex> persIndexes;
-            for (int i = 0; i < selIndexes.count(); i++)
+            const int selIndexesCount = selIndexes.count();
+            persIndexes.reserve(selIndexesCount);
+            for (int i = 0; i < selIndexesCount; i++)
                 persIndexes.append(selIndexes.at(i));
 
             if (persIndexes.contains(topIndex))