Reduce allocations by using reserve()

Change-Id: If34fa53402985f6b3c5e7217bce4a1177af835b6
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>

2 files changed, 4 insertions, 1 deletions

diff --git a/src/corelib/codecs/qicucodec.cpp b/src/corelib/codecs/qicucodec.cpp
index b375999aeb..4a4cfd45aa 100644
--- a/src/corelib/codecs/qicucodec.cpp
+++ b/src/corelib/codecs/qicucodec.cpp
@@ -417,6 +417,7 @@ QList<QByteArray> QIcuCodec::availableCodecs()
 QList<int> QIcuCodec::availableMibs()
 {
     QList<int> mibs;
+    mibs.reserve(mibToNameSize + 1);
     for (int i = 0; i < mibToNameSize; ++i)
         mibs += mibToName[i].mib;
 
diff --git a/src/corelib/itemmodels/qstringlistmodel.cpp b/src/corelib/itemmodels/qstringlistmodel.cpp
index dad736b445..b0919c5d78 100644
--- a/src/corelib/itemmodels/qstringlistmodel.cpp
+++ b/src/corelib/itemmodels/qstringlistmodel.cpp
@@ -276,7 +276,9 @@ void QStringListModel::sort(int, Qt::SortOrder order)
 
     QModelIndexList oldList = persistentIndexList();
     QModelIndexList newList;
-    for (int i = 0; i < oldList.count(); ++i)
+    const int numOldIndexes = oldList.count();
+    newList.reserve(numOldIndexes);
+    for (int i = 0; i < numOldIndexes; ++i)
         newList.append(index(forwarding.at(oldList.at(i).row()), 0));
     changePersistentIndexList(oldList, newList);